medicine bow wts-4 wind turbine field tests · medicine bow wts-4 wind turbine field tests january...
TRANSCRIPT
MEDICINE BOW WTS-4 WIND TURBINE FIELD TESTS
January 7985 Engineering and Research Center
U.S. Deportment of the Interior Bureau of Reclamation
Division of Research and Laboratory Services
Power and Insttumentation Branch
% a
icine Bow WTS-4 Wind Turbine Field Tests
I 7 . AIITYORIS) 1 8. PERFORMING ORGANIZATION ..-. - .
REPORT NO. B. Milano. R.C. Arbour. M. Roemish. & M. Jacobs I GR-85-1
9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO.
Bureau of Reclamation Engineering and Research Center Denver CO 80225
13. T Y P E OF REPORT AND PERIOD
14. SPONSORING AGENCY CODE
DlBR IS. SUPPLEMENTARY NOTES
12. SPONSORING AGENCY NAME AND ADDRESS
Microfiche or hard copy available at the Engineering and Research Center, Denver, Colorado
COVERED
Ed: RNW
16. ABSTRACT
This report is on the system fault testing and analysis of test data obtained at the Bureau's Medicine Bow Substation (Medicine Bow, Wyo.) Testing consisted of two 3-phase-to-ground faults for the purpose of evaluating the 4-MW WTS-4 wind turbine and generator interaction with the existing power system during adverse conditions. Testing was performed in con- junction with Hamilton Standard (Div. of United Technologies Corp. Windor Locks, Conn.) engineers who operated the WTS-4 facility during the subject tests.
17. KEY WORDS AND DOCUMENT ANALYSIS
a. DESCR IPToRS- - +wind turbines/ electrical faults/ electrical grounding/ wind-hydroelectric energy project/ 'wind turbine generators
b. I D E N T I F I E R S - Medicine gow Substation, WY/ Medicine Bow-Hanna transmsn In, WY
1 U N C L A S S I F I E D I
c . COSATI Field/Group OgC COWRR: 2003 SRIM:
18- DISTRIBUTION STATEMENT 19. SECURITY CLASS (THIS REPORT)
, U N C L A S S I F I E D 20. SECURITY CLASS
(THIS PAQL)
0 1 . NO. OF PAGE
35 22. PRlCL
MEDICINE BOW W S - 4 WIND TURBINE FIELD TESTS
B. Milano R. C. Arbour W. Roemish
M. Jacobs
Power and Instrumentation Branch Division of Research and Laboratory Services
Engineering and Research Center Ddnver, Colorado
January 1985
UNITED STATES DEPARTMENT OF THE INTERIOR * BUREAU OF RECLAMAT~ON
ACKNOWLEDGMENTS
The information presented in this report was obtained by Bureaupersonnel at Western Area Power Administration's MedicineBow Substation and is being presented to Hamilton Standardfor use in the wind-based power generation system impactstudy Hamilton Standard is performing under EPRI (ElectricPower Research Institute) contract. The data presented hereare only a small part of that required for the EPRI study. Thework was performed according to the jointly developed testprocedure presented in Appendix A and covers only thatportion of the test plan pertaining to the 3-phase faults.
As the Nation's principal conservation agency, the Department of theInterior has responsibility for most of our nationally owned publiclands and natural resources. This includes fostering the wisest use ofour land and water resources, protecting our fish and wildlife, preserv-ing the environmental and cultural values of our national parks andhistorical places, and providing for the enjoyment of life through out-door recreation. The Department assesses our energy and mineralresources and works to assure that their development is in the bestinterests of all our people. The Department also has a major respon-sibility for American Indian reservation communities and for peoplewho live in Island Territories under U.S. Administration.
The research covered by this report was funded by the Bureauof Reclamation's Lower Missouri Region Project Office.
The information contained in this report regarding commercial prod-ucts or firms may not be used for advertising or promotional purposesand is not to be construed as an endorsement of any product or firmby the Bureau of Reclamation.
ii
CONTENTS
PageAcknowledgments .., ii
Introduction.. .... . .. . . ... . ... . . .. . . . .. . .""
. .. . ."'"
..""'"
. . . .."'"
. . . . . ."'"
.. . . . .'"
.. . . .
Test setup .. .. 2
Instrumentation ,.....Parameters measured...............................................................................................................Calibration.. .. .. . . ... .
'".'"
.. ... . . ... ."'"
."'" """
..""
..""'"
. .. """"" .. . . . . . . . ."'"
..""
... ... . . .Auxiliary current transformers...................................................................................................Relaying... .
'"... . . ... . ... . . ... .
"". .. ... .
""".""
.."'"
."""
..""""
,.. .""'"
... . . . . .""
.."'"
.. . ... . . .""
22333
Backup power "" 4
Preparation of fault test procedures for analysis """'"
""""" """"'" """'" ""'" """ """""
5
Relay operation . .. . . . 6
Stability evaluation ... 7
References. . . . . . .. . .'"
. ... . ... . . . ...""
. ."" ""
. ."'"
. . .""'"
. ,. . . ."""
. . . ."""
. . . ."""
. . . . ... . . .""
. . . . .. . . . . 7
FIGURES
Figure
123456
System configuration .. 8Test 1 oscillograph record 9Test 1 strip chart recorder record 10Test 2 oscillograph record 11Test 2 strip chart recorder record 12Loading record prior to test 2
"'"''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''13
APPENDIXES
Appendix
AB
Contractor letter 15Stability calculations ""'"
"'" '" """ """'" ""'" """"'" """""""""""'" 25
iii
INTRODUCTION
The purpose of this investigation was in assisting Hamilton Standard (Division of United Tech-
nologies, Windsor Locks CT 06096) to obtain performance data regarding the interactions be-
tween the Hamilton Standard WTS-4 wind turbine and the power system during adverse system
short-circuit conditions. The WTS-4 consists of a 4-MW, 1800-rev/min, 4160-volt synchronous
generator connected to a 30-rev /min wind turbine through a 60 to 1 gear box. The gear box is
referred to as a soft-shaft coupling in that it is a planetary gear train for which the case is attached
to a fixed reference through a spring and damper assembly. The shaft twist between the turbine
and generator is obtained by allowing the gear case to rotate a limited amount with respect to a
fixed reference. The turbine generator is tied in to the power system through approximately 5
miles (8 km) of 34.5-kV line to the Medicine Bow Substation.
It is understood the H constant of the turbine to be rather large compared to that of the generator.
The somewhat unconventional system comprising the wind turbine itself, the large turbine H'
factor, and the soft-shaft justified the decision to investigate the interaction between the wind
turbine-generator and the existing power system during severe local system fault conditions.
Hamilton Standard requested three 3-phase-to-ground faults, four to eight cycles in duration to
be placed on the power system at Medicine Bow Substation. The objective of the proposed test
as explained to the Bureau was to determine if the machine would remain synchronized to the
system after the clearing of each fault. The likelihood of synchronism being maintained subsequent
to fault clearing, with normally expected fault clearing times, seemed good owing to: (1) the large
inertia of the wind turbine which would tend to prevent the generator from reaching an excessive
overspeed condition for short duration faults, and (2) the soft-shaft and associated damper which
would absorb a large portion of the resynchronizing shock when the fault is cleared and thereby
minimize the possibility of the generator slipping poles.
Hamilton Standard requested that the Bureau monitor system conditions at the substation during
the fault tests and to submit an analysis of the Medicine Bow Substation data, for use in the EPRI
study mentioned in the Acknowledgments. One of the purposes of the EPRI study is to investigate
wind turbine dynamics during various system conditions.
,The inertia constant H is defined as the megajoules of stored energy of a machine at synchronious speed per megavolt-ampere of
the machine rating.
TEST SETUP
The tests consisted of two 3-phase-to-ground faults on the 34.5-kV bus between the Hanna line
disconnect switch and the Hanna line breaker at Medicine Bow Substation. The Hanna line dis-
connect remained open to permit the Hanna line to be energized from the far end (fig. 1). The
Hanna line breaker was used to close into the "bolted" fault and to clear the fault. Initially, three
faults were planned. The duration of the first fault was to be as short as possible - hopefully four
cycles. Durations of the second and third faults were to be six and eight cycles, respectively.
During pretest preparations lat the site) the interrupting time of the Hanna line breaker was de-
termined to be 4.5 cycles. Fault clearing times of 7.5 and 11.5 cycles were realized on the first
two tests. As a result of these slower than desired clearing times, a third fault was not staged.
INSTRUMENTATION
Parameters Measured
The quantities monitored by Bureau personnel at Medicine Bow Substation were:
On the B&H (Bell & Howell) 519 oscillograph
34.5 kV bus voltage (all three phases)
Hanna breaker fault current (all three phases)
SVU (system verification unit) line current (all three phases)
Hanna breaker trip and close signals
SVU line breaker trip signal
115-kV circuit switcher trip signal
All signals were obtained from the existing PT, CT, and control circuits.
On the Gould-Brush 4-channel strip chart recorder
A phase SVU line current
A phase 34.5 kV bus voltage
Three-phase SVU line watts
Three-phase SVU line vars
All four of these signals were obtained from Bureau furnished standard 0.1 percent accuracy
current, voltage, watt, and var transducers.
2
Calibration
All a-c voltage and current signals were calibrated the day before the test at Medicine Bow
Substation. Voltage calibration consisted of injecting a known a-c voltage from a Fluke Programm-
able A-C Calibrator (Model 5200A) and adjusting the galvo shunt box for a specified oscillograph
deflection. The current signals were calibrated in a similar manner except that !I Valhalla Scientific
voltage-to-current calibrator (Model 2500-E) was inserted between the Fluke Calibrator and the
galvo shunt box. High accuracy DVM's (digital voltmeters) were used to verify the voltage and
current output of the calibrators.
The current and voltage transducers (Scientific Columbus CT-510-A4 and VT100-A4) were cali-
brated in the Engineering and Research Center laboratory the week prior to testing and checked
at the Medicine Bow Substation the day before the test. The Gould-Brush Strip chart recorder
was adjusted to obtain the correct deflection for the specified a-c signal into the voltage and
current transducers. The Fluke and Valhalla calibrators and high accuracy DVM's also were used
for this calibration.
The watt and var transducers (Scientific Columbus DL3-1K5-2Y2A2 and DLV3-1K5-2Y2A2) were
calibrated in the laboratory the week before the test with a Scientific Columbus SC-60 calibration
standard. The Gould-Brush strip chart recorder watt and var channels were checked the day before
the test with the high accuracy DVM's.
All Medicine Bow CT and PT ratios were assumed accurate and were not included in the calibra-
tions.
Auxiliary Current Transformers
Due to the high fault currents involved, it was necessary to install auxiliary step down 50 to 5
CT's between the Hanna fault current line breaker CT circuit and the monitoring equipment. These
auxiliary CT's reduced the current an order of magnitude from about 90 amps to 9 amps.
Relaying
The instantaneous overcurrent elements on the Hanna (fault breaker) line breaker ground and phase
overcurrent relays were disabled. The Hanna breaker phase overcurrent relay dial settings were
increased to 3.5 to provide 15 to 20 cycles of delay in pickup on the faults.
3
All circuit breaker automatic reclosing at Medicine BowSubstation were removed from service.
An instantaneous overcurrent relay supervised by an auxiliary electromechanical timer was installed
to trip the 115-kV circuit switcher and the SVU line breaker approximately 12 cycles into the fault.
The purpose of this backup protection system was to clear the switchyard in the event the Hanna
Line fault breaker failed.
The actual initiation and clearing of the fault was accomplished with the Bureau's sequence con-
troller. This specially designed device was built for precision sequence control during power system
short circuit testing.
BACKUP POWER
An engine-generator was used to provide instrumentation power during the fault tests. This was
necessary because Medicine Bow Station service would be lost during each fault.
The sequence controller was battery powered and therefore did not require a backup power supply.
4
PRESENTATION OF FAULT TEST PROCEDURES FOR ANALYSIS
Two 3-phase-to-ground faults were performed. These tests occurred at 2:50 p.m. and 4:23 p.m.
on Wednesday, November 16, 1983. The tests are referred as test 1 (2:50 p.m.) and test 2
(4:23 p.m.).
Oscillograph and strip chart data records with labels and calibrations are shown on figures 2 through
5. In addition, a strip chart record of the wind turbine generator being loaded prior to test 2 is
shown on figure 6. The polarity of the current and voltage traces on the oscillograph are such
that power flow out of the substation is positive.
The SVU line loading just prior to each test was about 2.8 MW (test 1) and 3.7 MW (test 2). The
test load levels were preselected by Hamilton Standard staff. The target load values are believed
to have been 3 MW for test 1 and 4 MW for test 2. It should be noted that the Medicine Bow
Substation SVU line power will be slightly different from the Hamilton Standard generator terminal
value due to the local load at the test facility. The same holds true for the VAR measurements.
The first fault lasted 7.5 cycles and the second 11.5 cycles. In both instances, the breaker was
tripped as soon as the breaker mechanical close sequence was complete. There is not an apparent
reason for the four-cycle difference in breaker cleaning time and this may be normal for this type
of oil breaker. The breaker was timed earlier in the day and found to be consistent in both the trip
and close operations. The time for close coil energization to mechanical contact closure was 12
cycles. The time from trip initiation to mechanical contact parting was 4.5 cycles.
As can be seen from the fault current oscillograph traces, there is a distortion in the first few
cycles of fault current. This is in all probability due to CT related problems. There were about 90
amps flowing in the Medicine Bow 5 amp CT secondary. In addition, there was an added burden
from the Bureau's auxiliary CT's and monitoring equipment.
The records presented on figures 2 through 6 are marked with labels, calibrations, and actual
measurements. All measurements and calibration were taken from the original oscillograph and
strip chart records.
The response time of the current and voltage transducers was somewhat less than ideal for the
short fault times involved and, therefore, the outputs are somewhat meaningless during the fault.
5
The var and watt transducer data are invalid during the fault because of the loss of the bus voltage
during the short circuit period.
The frequency measurements obtained from the SVU line current oscillograph traces are rather
crude. These measurements consist of a simple period measurement that is converted to a fre-
quency. Each arrow points to the cycle for which the corresponding period was measured. Meas-
urements were made on the original records using a Gerber variable scale that was set to one per
unit period on the 60-Hz post fault voltage waveforms. The oscillograph paper speed is controlled
by means of a servoloop controlled d-c motor and therefore is unaffected by the frequency var-
iations from the engine generator power supply. In addition, a cross check was made by checking
the frequency of the fault current oscillograph traces.
The PT A-phase bus voltage was 72.06 volts prior to test 1 and 72.00 volts prior to test 2.
Measurements were made on the 19900/67 ratio A-phase PT circuit using a high accuracy DVM.
RELAY OPERATION
During both tests, targets appeared on the blocked Hanna phase overcurrent relay instantaneous
units at Medicine Bow Substation. This was to be expected and was the reason why these units
were blocked. In addition, the A and C phase overcurrent instantaneous units picked up at the
SVU facility and tripped the SVU generator breaker approximately seven cycles into the first fault.
It is believed personnel at the SVU facility blocked these units to eliminate the problem during
subsequent tests. On the second fault the WTS-4 computer control equipment tripped the unit
offline on "frequency out of range" and "overspeed" conditions. Again, the trip occurred ap-
proximately seven cycles into the fault.
The SVU facility relay data sheets indicate that the phase overcurrent relay instantaneous units
are set for 22 amperes (5280 A, primary) = 150 percent of the relay rms symmetrical subtransient
current for a zero-arcing-resistance 3-phase fault on the Medicine Bow Substation 34.5-kV bus.
This setting was recommended by PTI (Power Technologies, Inc.) and the Bureau concurred. The
values of the SVU 34.5-kV line phase currents measured during the first staged 3-phase fault
indicate that the current in each of the instantaneous units would have had a value in the order of
17 amperes rms or less. The instantaneous units set as indicated should not have operated. These
units should be bench tested to verify pickup level. It should be confirmed that the CT's being
used are connected in wye for a 1200 to 5 amphere ratio and performing within specified accuracy
tolerances.
6
STABILITY EVALUATION
A review of the test records indicates that the WTS-4 frequency at the end of seven cycles
reached 63 Hz during test 1 and 67 Hz during test 2. The increased loading during test 2 would
be the primary reason for the higher overs peed condition in test 2. In test 1, the generator most
likely would have been able to regain synchronism with the system had the generator not been
tripped offline by the overcurrent relay instantaneous units. During the full load rejection of test
2, the machine may have been able to regain synchronism with the system if the fault had been
cleared in less than seven or eight cycles. These statements should not be taken as authoritative;
they are based on a very crude analysis and measurement of the angle between the WTS-4
and the system during the fault period. Many simplifying assumptions and approximations were
made and considerations were not given to the machine dynamics with its special spring-damper
type shaft and large turbine H factor. Also, it should be noted that test 2 was not the worst case
since the system would have the smallest stability margin when the machine is absorbing vars.
The subject stability evaluation is presented in appendix B.
The result of this analysis is rather unusual in that even though the turbine has a rather large H
constant, the unit performs like one having a much smaller H constant. Primarily, this is due to
the soft shaft that essentially isolates the turbine inertia from the generator inertia.
REFERENCES
Power System Stability, Selden B. Crary, John Wiley & Sons Inc. New York, vols. 1 & 2, 1947.
Electrical Transmission and Distribution Reference Book, Westinghouse Electric Corp., Central StationsEngineers, East Pittsburgh, Penn., 4th ed., 4th printing.
7
4 42. S" .., :z.3""~ ~Yi.A .:J '138:::qzA
~r "Nl:>f"~\AL\
'f '�ZA.
'�'/3A 4+1'1'1'58oPE:.rv
34-1"''�Z.A 541-+~S'
--OPf.N
)l.Y3A
'345'...........
oPc.N
-ro HOT spf2 'I'YJ~
~/0 S£M\~Oi:.
'-1a," '"
\\ .s \N It" CI-\t.a'N'f,A I"'"
~'7""0 L.,P. 1'2 "'1"'
\E
'h;
l:::".
'f:t
('""'\{'\
1<' Y\ po.
::;:-. 5' "I,t:r{ ION
5C:~VI e..E.
w"1 3 A3~ .3
\N'12.A"""4:5
'N Y 3g!::>-1..3
HAtv~Al...11'-)C.
C ~tZ.Gc)Pv-p()W~
LIN'-
SVLJ..LINt.
Figure 1. - System configuration.
8
<;::~'..J 1_.'3tp. ..",,;>\"~ - 4 ,~",. ~
'fV'.""'J
::::>J: .;:- .;1.:'5"0 f"
"Zo ~(t >
I '
II! Ib I ~
I~
,
\
V,?, p,~
:-.7~~~~I(""",S~,-
\ 1\ (\;\/ \,
'
)7
V v""' \I. o..,~
,~"A, .,.,
O.,i
.::L.. ~"..I.:"
" 0;1. D (J,il1".5Ir' (' .
" -0 ~D+O r...........\ PI'
~& <;:""'L"'I"
<Ie';;'Q4-Of>."""\
f'r
,J"
37.\ """R~j
\
vO'''b''~
0v' :
,
t .,
~'V~:NIJ~-~~'5'"'~"'-'"e ~
'*O~
~ ~ - ~. -,,..- ~ 7. 1 Io(V~
T\,
""J
-rW'"
~
~p.."I..", c..\)I<(t~~":b [II 8~S
I3") /(YC'tM 50
!;'''~
i + ~~"1;:10."'\.'"
t f',
r~e..l.f"$'''''~ :~~q'-1 ~~ < .'1j Vc..
I?,,~
,
i
,
7 .1\'~~~\~ N\\'~r.'" \.1.'5"1"'"
~"""~IV"c.v(Z.(!.;"" 'I>
'"' ,
7. '; ...1... I~
",,~I\Hj
P"-
'V."'OON"
\j \:
',
(\:~~~~~~.;,.~
"
V"Pf '" 1.."
\(->..,.
:r..;. 4 \.,.'j(..L"''''
"'"\ f't>\Jrz."'-I"IO>..)= f.o
~'\}
cv<fl'"~ ,
I
.s~'---;;
C?r{~eMs.0.."
f'-1fI!--7'? 4- (l..f>'-"'~~
I~ 4 '1 f>,
10'''<,..\<.
\ r;r-I Ie.!.'!
~f :::t: ~'T~'
~rt.C>""t.lz. :;:. ,
,./,..
~ ;:::",\'\'11..-4b"3 7.1~"'. ~~
ii
~ \ ..'31"4: Co 'OITSo+-,
b 'l ~f1"JI'oI<
1,.JIi
...
., -, 7 :; 0 Po a.""I
'f' f .-
,_T~ ~...z.
ct.-os€'. ~.. Z-_..,..~ 5+".,-C!.,;:>\...
~~..(..,~~""~L -7"-\S. IS ..~ ",I ~s. 1;0'",
Tn:.I(oJ _\~~\-.--1'.AiI'''
~
t- .so "","ION
~ i'lL. INt>'t!> Ie'Li'-~6..
-rH\S SI"f8,t--)~t.£.. Iq. C"Q,..,....
1'rl'''' "'e.C1."~,t
--t-.--
\,,~CH,
__i,F \G.LAf'-E:. ~1)4 \.~ )Z.t<"o(t ~ . --,~.. ~
i
I
"'''-''~'-'~'\.'''''~''S,-nON\ ~,(.., ,,,'-.~
~')):""~t:)'.J -~\...L-;;;;,
'""N
osc illo g raph record' 2 - Test 1Figure.
9
w -r'S- 4- -r ~ .$' -r 1.I I / /"1 . .3 ~ l!:'" 0 "M
~ ?5- fi,1Vl) ~~\)L.\-, -,
- - - ~.-~ ,,4., ~ v'~.
,i ,": ',=1.- '1 ,'"iil--f, _d
~="i !- '~~j i -~ i
::-=- _:: :~-- ~..
J-\:I'~:l' f:: .e:l='
:c\: ,- :=. :'~::;:l:.f
",,~,..,.~~.1LI:~,.,.-::;1~£-:+-:.J..T:.n:.:==f:': ,,-- :de
-,=1 ,j+-"
',:
,=h ::of::1 e.£ ',-
.t ! ! "-'!~:'T:-~:i'. -, L
I:+:-" E:':1 ~:-t:~::-1~~' _.~
'i!t:-d!:.,"
-:'1 in/,:I
',
!',: I
-,- :,,:::!:..-,:,
'"i',I':: "
;V..16,4i.3F'I',-:;p ,,-;~~--t:'- iFi,{ -, ~,i
i r~~--=:L- :.j tv!'\-l'
" '-
,j,-
"L-i., i .' ,. =: _e-,' -:~_:=' i..-
,': ee''-',:
:-= :,e: ,'j
'.
~i
..u
::::::J::t -'-~"-1---
-: -jC::J I,
-'[,_ccL I.:c:
- J>w.'HI~"\I\..~,..ru.~b"".11 ~
~. .,..~E .UII,.eorr6 L..\""."O~
..~- :I ere'., "4
, ,
,
~-:- --I. :.~ - -1-
"'1""~: '#~ ;
~~-~~:~_. -- --~ - : "-:L,j
~~;~~~;--i~- =t: :~n
,-~:~:-.-~f=--~':-~-E -4 -..---
~~_4-::-~~J-~ ~-~~:=- -¥+~-:~_. ._~'~:f ::CI:~1==x"E':=:=
"--T", "'i:~:::~:ee:r-, -;~
----- .--
-'c
P'\~!'\:
.. ,':C.. f/..
, ..'. ,0:,
-','
'- j,',:
",::
'"
-:,'., .',', i:I
'a.'C.ie..&"'I
ACCUCHART Gould Ine
-
J:1 >rT""j
",,-i -1: u- ,
::-" ;', ,.. r::li"'-"':' ','
,...",'
,,' ;
," ""
-:.. :" ""'T'-: ." ",'::;.', ,-,:'
,-"",,::' i',-,;-' "", f'~ ""'1:
: ", .iT -;", : ',""",.. =' ,c, ,':'cc:: -'I: ~r.:;:::
i'i,',',:: :'
[,re:- 7;,""..1', -
"'\"'"
'",
'
, :
"
j'
':','i ,,:::u,=
=;';"1 'F'" I ': !"-: . 1...;.-
-,-- I,--i..
~'-:
: , 'i.;'~ ,I, ,L: . ~ "", ";:-== ,':' :
-', -'~ '!:...,
'('iA'V'JiJ)"" 11",,;~i.:k', ~~!'''fX : I. 1'; ':'
"j ,l
"";; '+i"i:':
,~: I;, ;-i-i
~ <.-,t MyJ ~~/I.,)~/ITI"I" ~--- 1)\ e~~c;. -i'~"" -rf2.A.ub~Guz.S
~ "."to MVAV ~ -v..rt,- 4- '/ \Nt,c," S'c.'W~'r"L'N,,7'D
" " "'"
i -';- J: ;i/ttN..llcd:~,"~:,,»v~b"b'liI(~Q!
""'.:t...,f;~'~;: ',~ ",,: c it..&-"\~.fr!)(:,c'L
-'" 1'"",.,-', K.:::, ,:: ,I. ""',::'! ,"
'-..:':',:: ,-,' :\:, I" .. "i..!,
-. .-...;"..,
"I"
"U",,': :"~'"
i;
"
.Ie-:-- (- ~
",' ;lii:>
,,'"r"
,,:,-
"i i
s: V\.A 11". V"'''"1,-,
,, ,'
;:V~'";',,"
'i ij- ,",-
,
"'MOW 'f'I\,r",I-\I.:JC--
.r,-
c, :,:' :,
,
--
---
~..~
-~., .
~. ..
:,
,--
, ,,"
~,~---' -: ,"
,
,,~.tS.~ ~bS~ O.+WtVA.e.s-Y,
I 'z~-",
\
"
,.j.;
.".:..
-"~~.,..
-
"
.~.. ~...~~
,
"; ,; ,!:..;:
-'--.== Go., &- MVl4teJ ~~rItI\w~~.. ,4---'..., "-~-~ ~---+--'
~. L~ ~
-.-,. ~ 1
\--'".".
_.,~"'.'~ ,~..
Figure 3, - Test 1 strip chart recorder record
10
"'/""5-4 1e.S" t. "34>-~')~ F"'\lL'1"'IF, ""t>""7~.(50V~37-1 ({\I..\. "/I~/".1":;:: 4<Z3~M
"''1M Vp-r ,,~ '0 7~ .<f'J",lbOO (>.rzM5> 139()
AII.""'" 1" ~ ~C2 D ".",So
-;::;J"\~'l'\
\w."CI. A
\' ;(\v'
,
. \ (} /\\J
/\V
~)V
~/\~
/~
~.."'\..' \ ( (' ... Ie\ I
'
,,; I
'.\j \v
"~::"'MDJV:V'"\l\
'3'..7I<, (!.!'i'J. IIi~ S;-,,\).\.\~v.(tI",,\QN ~\'.\ C.-ac.L,,-" I " - I ..,
5('f' - ... P" 1""-<
\~ ..\
\~'h~
II"10. ~ ~
. ""<
\/,.. 8 VIS
t).'I!' ~I'. 4 "~ 5"9. -~. Z
~.-~I"
A "B v."'S
\ /~.,,;.-- iJ7. \ K"nMS
"''''Vol."' t>UQA"'("ON -= II.S- c..'Ic:."'''-S'I
;I pp
'"I. 2
'" f'~'r-
'
J "0.!.5 ">,>->~ .,0.3"
\ D. 3 ~ ca'<;' ' e ~ '\ s-
"\! to G
"'''°. ~s"'-- 3~.7K"(/.M.S'
~p...v.\..'" 'C>v.rt.'A.,.:')N :::.. \!",'8. _c..."ft..l..~ 50 I';'",; I.:Z '5 f'';''
2. 5":3 PItt""':\'~f'. 77()"'~",s
\'1'1" ..770"~M~,,/
Rl>E.A.~ 7./ (v ~ ri"'"
4- ""'N(""j,~\AM\""'o.. i!.tA!"'° 'H'tZ.4)
~(.""""'5"\ 2 h 2. /In.r<>s,., ("I H'}- 1.7 Hi-
,"pp -:7S0.'ia.MS
~ -rR\~ s loI;,NAL...
~ ~~- 5"".1 C.'tt.L'E.S. c..o~\ Pd..'"-=---\ -r rt. F'V 1&.1-'T \ME..,..~,p>1
,
..> T141~ ~\""O->""L ''''b'e.P.'e.S. """'t:.NM..C.H,
r=:--- ,...rr.'f' SE.Gt\Jr ,~e .s '-oM"L~"'i.i,
-nt\!" 14,+
)I
~\~U.n.~!+I
...,.+'\~ i<..1to!Z.':) 1-\\\"S,15£.EN ,1;j\.K.Hf..D I..{Q - \11,\\ \V"\~p.S.',.)"f.fl"..:.I-J'<; ~Q()1(v\°!"l'G,.1/JAL..
c..LQSE. :34-~
- --T'~'P S"~
Figure 4, - Test 2 oscillograph record
11
I
I .1 1. --. I'I
~! :
\N 'T S - 4- 'T £ s, 21'('6 /. ...,. $ 4: t '3 t'M
:s ¥ - -1'01 r:> ;-,..v I...~'''''' .
" '-' It
..to .~14YI.-~ ~~'- .-.
~v.s \hi-'"TS 1-
III,
',';,
!~:i .'; '..1~~~C+< ~\
!
t": :
i"! :
\ i - ". 1.1s Y\l\w"..,"t'.j- t , ,
sv\.\ U~W~.,.!.,..s
1fti=-5~1:f: tt~rJ
~- b'~- 'ft'oW Q 'N~,",'~~
£: Co." 8 w..\J_tt.\, -r:. 'N'T~':'
-~ tl\~"
V- e ~
,,",'
'~I
. ,., .
'.
~~tt.,~ ~~~" ""~III...nbVc,"L.~
'N Co(Z.t. ~ I-"y...)CWo~ '\
""'.." t:>i(~h i>1n'"" \~I) ..",,,,,,,Lt., .
. ...~ V.\.o.~.~- ' ..' ". ..".,
~~n
f 'I. .;.r',..
.~ .
\1'-\>..-,
.'...,I'~, .
FL '
.
'S ~ ." V~.eS~
. ,~\ !
~~~----.
"
1.2.'
~~,!A-~ l; ".\1 ¥ -sr- - 0.---------
. ,-~---~--~
''-~ ~"---'--'
--~ ~_._--
~ -- --~-' ~---------_.-
Figure 5. - Test 2 strip chart recorder record
12
W\'S- 4- LOA D \ I\) <:...'Pe,o~ 10 -rt SI Z
tI / 1.6!.~ ::S:: "':,",,0 I"WII\
.,., f"\t . 000It
111111111111'11111"11111'111'1"""."111'''111111111'1"~I'~.
----,+.)!{.J, -
~"1i..'~":"i!:'C-- .3 ~ ~ ",-,
1 -.
f . I' I I . I III . I Ii' 1 I~
i I' I f--1
II'
I . I .1 1.0..1..1 1 II'
t I I II'
I .1 .1
- JS-'~i< ! .1
;
: ,,-~t;,~-
..-, -I..- ",-,-, 1"" -~ . .L.
ACCUCHART Gould Inc. Cleveland-
I::~ +..:~~tr.:..:~~~\N~:::~.1-
::.. I;:.,:.:I
~.~t~1..'i...1.'j..:...i 'ii,-., ,'...!, :. 1...
H;a~O' j':=i I : - - - ~-: - - -. : - - . - i
-I'
;
,.. -.
----.... .,c..
' :.::. -.~-
'-' '---'--------.------
--' ' '---~--'
--'---~---------------_._----_._---_.
-o '~ ' r-----
7t .'
"' ~---'-'---------------
-,-~ ~~~-. ~ .
' ~.~
Figure 6- - Loading record prior to test 2
13
APPENDIX A
CONTRACTOR LETTER
15
APPENDIX A
e. UNITEDTECHNOLOGIESHAMILTONSTANDARD
Windsor Locks, Connecticut 06096
203/623-1621
1-3-8SeptemberTMH-83-03
1...,..,..~-,..,:-=-~-"1 M 1 '
g' 8.3 }' --' i~~.-"
'11
....
,,,,:,
.
,;~~
t(l-~.-~.
J."
~;,,._.~-~
,--IL' 1-0-c'.,'--I~ J::~
COD To:
OFFICIAL FILE COpyRecl2m2~ionl ~"
~ .N .,C3;0:1
SEP 19 1983
Mr. R. J. GyllenborgDepartment of InteriorBureau of ReclamationP. O. Box 25247Denver, CO 80225
Subject: Transmittal of HSER 9003 - Test Plan -Utility Interaction Testing of the WTS-4at Medicine Bow, Wyoming
Dear Gil:
Enclosed is the test plan for the utility interationtesting planned for the WTS-4 in October, 1983.
I have received and incorporated suggestions fromEric Hinrichsen and Bert Milano, As we discussedin Denver in July, Bill Young will coordinateactivities at the WTS-4 site and Bert Milano willcoordinate activities at the Medicine Bow substation.
We should be in a position by October 10, 1983 toconfirm activity on this test plan for the followingweek. Unless I hear otherwise, this input will godirectly to you.
Again, I want to thank you and the people involvedfor their splendid cooperation thus far.
Sincerely, ~,
c/id!);tt~Thad M. HasbrouckProgram Manager
TMH/hj
", j .'--'.'- ."
. .. . -. r
'''": ''\.- .'~. '!'--If you dc':" ..'. '-"..'. ~ t '.
. .
inseri YOpr C ",'
".,:,,$P~f:'Sd
-4 Ol.",~n"" f'")'''''' r
."IOJ~:,
'''''.'''''''.'''-..--..-.....
Enclosure
cc: Eric Hinrichsen - PTIFrank Goodman - EPRI
16
!t UNITEDTECHNOLOGIES~O[gjJ@OO~&oo~[ffi[Q)
APPENDIX A - Continued
TEST PLAN
UTILITY INTERACTION TESTING OF THE WTS-4
AT
MEDICINE BOW, WYOMING
SEPTEMBER 15, 1983
17
HSER 9003
APPENDIX A - Continued
II UNITEDTECHNOLOGIES[Xj£[ij]O[1,'iJ@OO@'iJ&OO~lQ) HSER 9003
UTILITY INTERACTION TESTING OF THE WTS-4 AT MEDICINE BOW, WYOMING
1.0 INTRODUCTION
The testing performed under this plan of test is part ofTask V - Utility System Impact of the EPRI program numberRP-1994-6. This plan of test covers descriptions of instrumenta-tion, test conditions and test sequences for the utility inter-action testing of the WTS-4.
2.0 TEST ITEMS
The items to be tested are the WIS-4 wind turbine atMedicine Bow, Wyoming, and the 34.5 KV line connecting the WTS-4to the Medicine Bow substation. A one-line diagram showing theMedicine Bow substation and the WTS-4 (SVU) 34.5 KV line isshown in Figure 1.
3.0 PURPOSE OF TEST
The purpose of this test program is to obtain operationaldata on the wind turbine and the utility line during varioustransient conditions. These include breaker open-close testsand testing of the WTS-4 over the full range of its VAR capability,measuring line and wind turbine operating parameters. Also,measurements will be made on the line and WTS-4 during three-phase testing to determine adverse interactions, if any.
4.0
4. 1
TEST SETUP
Breaker Open-Close Test
The test setup for the breaker open-close test is thenormal operating mode of the WTS-4 with the engineering datasystem (EDS) operating and the power system in its normalconfiguration.
4.2 VAR Test
The test setup for the VAR testing is the normal operatingmode of the WTS-4 with the EDS operating and the power systemin its normal configuration. Analysis has shown that the 34.5 KVvoltage at Medicine Bow will vary by 4.7 percent over the full
18
APPENDIX A - Continued
I! UNITEDTECHNOLOGIES[):{)&~O[1,,'U'@OO
~&OO@&OO@ HSER 9003
4.2 (Continued)
range (4 MVAR) of the WTS-4. Before starting the VAR testing,the system voltage shall be set to midpoint of allowable rangeso as not to cause any adverse effects. The voltage setting willbe established by Western Area Power Administration.
4.3 Three-Phase Fault Test
The test setup for the three-phase fault testing is thenormal operating mode of the WTS-4 with the EDS operating andwith the power system altered as follows:
For the three-phase fault test, the 115 KV line fromCheyenne to Seminoe shall remain intact. The load at ShirleyBasin shall be fed from Difficulty. The loads off of PCB 342at Medicine Bow shall be fed radially out of Sinclair. Theloads off of PCBs 442 and 542 at Medicine Bow will be affected bythe fault testing. Switch 341 shall be open and the fault willbe placed between switch 341 and breaker 342. Breaker 342 shouldclear the fault in high speed. Appropriate controls should be in-stalled to trip the 115 KV circuit switcher 164 in the eventBreaker 342 fails to trip. Should breaker 342 fail to trip,there will be a short service interruption of any loads fed offof PCBs 442 and 542.
4.4 Instrumentation
4.4.1 Breaker-Open Close Test
4.4.1.1 WTS-4 Parameters - The WTS-4 parameters to be measuredduring the breaker open-close test includes MW, MVAR, generatorvoltage, line voltage, RPM and blade angle.
4.4.1.2 34.5 KV Line Parameters - The 34.5 KV line parameter tobe measured during the breaker open-close test is line voltage.
4.4.2 VAR Test
4.4.2.1 WTS-4 Parameters - The WTS-4 parameters to be measuredduring the VAR test include MVAR, MW, turbine-to-line phaseangle, generator voltage, line voltage, generator exciter field~urrent, low speed shaft torque and blade angle.
4.4.2.2 34.5 KV Line Parameters - The 34.5 KV line parameter tobe measured during the VAR test is line voltage.
19
APPENDIX A - Continued
I!IUNITEDTECHNOLOGIES[}{]&'fK'A]O[b'IT'@OO~&'OO~IQ) HSER 9003
4.4.3 Three-Phase Fault Test
4.4.3.1 WTS-4 Parameters - The WTS-4 parameters to be measuredduring the three-phase fault include MW. MVAR. turbine-to-linephase angle. generator voltage. line voltage. generator exciterfield current. low speed shaft torque and blade angle.
4.4.3.2 34.5 KV Line Parameters - The 34.5 KV line parameters tobe recorded by oscillograph during the three-phase fault testinclude voltage and current for all three (3) phases and the tripand close signals of breaker3442 and 542 and circuit switch 164.Three-phase VARs. three-phase watts. phase la' current and phase'a'voltage will be recorded by strip chart.
4.4.3.3 Fault and Timing Instrumentation - The fault will be athree-phase bolted ground fault. Western will provide USBR witha fault current study. The breaker closing into the fault andtripping time to clear the fault will be accomplished using aUSBR sequence controller. An electric motor-operated mechanicaltimer will be used as backup protection.
5.0 SEQUENCE OF TEST
The breaker open-close test. the VAR test and the three-phase fault test may be run in any sequence. The paragraphsfollowing apply only to the sequence of events with each test.
5. 1 Breaker Open-Close Test
Open breaker 542 at the Medicine Bow substation and re-close in approximately ten (10) seconds. The WTS-4 should comeoff-line to a normal shutdown and restart when the circuit breakeris closed.
5.2 VAR Test
The WTS-4 should be operating at or close to rated power.The line voltage should be set by Western to a nominal value suchthat the VAR test will not cause excessive voltage variation. TheWTS-4 generator excitation shall be varied in 500 KVAR steps.At each step the WTS-4 shall be operated for fifteen (15) minutesto provide ample time for monitoring performance.
20
APPENDIX A - Continued
t!lUNITEDTECHNOLOGIES[}{)£[I'A)O[1,'fi'@OO~&OO~[Q) HSER 9003
5.2 (Continued)
The WTS-4 generator excitation shallthe WTS-4 supplies VARs to the line in stepsunity power factor (0 KVAR) to 3000 KVAR andthe line from unity power factor (0 KVAR) towill be ten (10) test settings:
be varied such thatof 500 KVAR fromabsorbs VARs from1000 KVAR. There
. 0 KVAR
. 500 KVAR
. 1000 KVAR
. 1500 KVAR
. 2000 KVAR
. 2500 KVAR. 3000 KVAR
. 0 KVAR
. -500 KVAR
. -1000 KVAR
5.3 Three-Phasa Fault Test
The WTS-4 should be operating at or near rated power.Breaker 342 will be closed into the three-phase bolted groundfault and tripped to clear the fault with a clearing time oftwo (2) cycles. The behavior of the WTS-4 and the 34.5 KV linewill be monitored. As conditions warrant, the test will berepeated increasing clearing time in two (2) cycle incrementsup to a maximum clearing time of ten (10) cycles. Decisionsto increase clearing times longer than two (2) cycles will comefrom the WTS-4 operation personnel.
6.0 COMMUNICATIONS
6. 1 Notification of Testing
Western dispatchers require one (1) week notificationprior to beginning tests.
6.2 Communication During Testing
During the breaker open-close test and three-phase faulttest, a three-way telephone conference arrangement shall beestablished for simultaneous communication among the WTS-4facility, the Medicine Bow substation and the Area DispatchCenter.
Since the VAR testing does not require staging, acommunication to the WTS-4 facility that the line voltage hasbeen set will be sufficient.
21
APPENDIX A - Continued
~ UNITEDTECHNOLOGIES[X]~O[1,'jj'@[ft]~&[ft]~OO[Q)
7.0
HSER 9003
TEST LOGS
A written log shall be maintained at the WTS-4 facilityfor all tests listed in this plan. Entries shall include,but not necessarily limited to:
A.B.C.D.E.
Test identificationRun identificationTime of day of test startChannels monitored on theSignificant events.
and finishstrip chart recorder
A written log shall be maintained at the Medicine Bow sub-station during the three-phase fault test. Entries shall include,but not necessarily limited to:
8.0
A.B.C.D.E.F.
Test identificationRun identification (i .e.,Time of day of test startChannels monitored on theChannels monitored on theSignificant events.
clearing time)and stopstrip chart recorderoscillograph
REPORTS
Each group involved with the testing shall prepare areport of activities and findings (supported by data) for theirportion of the test. These reports will be compiled into one (1)report for inclusion in the final report to EPRI.
9.0
9.1
SCHEDULE
Testing Schedule
Scheduling of these tests is tentatively set for the weekof October 17, 1983. The VAR testing is scheduled for October18, wind conditions permitting. The breaker open-close test andthe three-phase fault test are scheduled to be conducted October19. wind conditions permitting. October 20, is scheduled as aback-up date to account for delays or additional testing.
It is anticipated that the equipment to perform the breakeropen-close test and three-phase fault test will be in place andchecked out prior to initiating testing on October 19, 1983.
22
APPENDIX A - Continued
mUNITEDTECHNOLOGIESm~O[1,'U'@oo~&OO~[Q) HSER 9003
9.2 Report Schedule
Responsible parties should have their reports drafted andsubmitted to the HS project manager within thirty (30) days fromthe data of testing.
23
4 42. S"..,~3"'i? ..::r 'I Z A :rY3~::;q 3 A
~r'NI>f"J>.\AL\
'f '�ZA.
,/Y3A 4+1'1'138oPE:.1-.J
34-1Y..'1ZA 54/
"""5""-OP!.N
Y-Y3A"345
...........
<0 Pc.t-J
APPENDIX A - Continued
-r°
'q6
G
HOT SP 12 '''J~
fIT
"-\(Z<..II'\" .sW\"'1"C~UZ
1
'N~,A ,.'"
~f"""V\
1< y \ po.
~"ro f I\ R ,..f'IIe.
~
/0 S£""\~O~
::::; 5' "I,IY(' I 0 tVSC:~VI c.. Eo
W'13A34.3
'N'12.A...,.4:5
'IN Y:3g
1:>-1..3
HA!\.JtvAl..1f',)~
CiAtZGDrV-Pow'C/l
LIN~
sVv..LINE.
24
APPENDIX B
STABILITY CALCULATIONS
25
APPENDIX BMachine Data
4 MW 4160 V 694A5 MV.A
0.8 pf Xd = 0.215 pu RA = 0.028 QXQ = 0.828 pu
Base Z = Vrated phase = 4160/1} = 2402 = 3.46 Q
Irated 694 694
Check Base
694A * 4160 V * 13 = 5 MV.A
Machine is at 4 MW,unity power factor, 1.08 per unit
Find current
I = 4 MW = 514 A2402 * 3 * 1.08
514Ipu =694
= 0.741 pu
26
1800 RPM
Xd' = 0.208
BY DATE PROJECTTsHEET OF
CHKD BY DATE FEATURE
DETAILS
APPENDIX B - Continued
7-1664 (7-78)Water and Power
COMPUTATION SHEET
)(cA ... t. Is'
1/ t.,.,. \&
-::r. ~ O.'7~1
'X~ ~ O. ~ to,
)(CQ-:L'"' O.ttt" {J.7~1... tI.&J;~)(" --:;; ~ ~,I£ t/ o. 7 + I .,
I. ~ 'I 3
x/ o.~"i'
L,I1 ~
""O. '7 + I ~ s''''
50. ,., 0."3. 7
-:: /). 74- I -'"C.Os 3 8 ~ (). c.+
~r) ( Xj- )(~) . 0.37 (2.1~ -I),tot'S') :; b.4'
i.. X)..: (0.7+/)(0.':408')": 0.15'4-
i." ()(~- x/)... O.37(O:~.z.i-O. ~O'il) ~ D. ~~
e'C\ = '.03
£. ~ ~ E - ( XJ - X /) l. of
E ~I.,s- _{l..'~ - O.~.o'i\(O,,?>"'1\~ \.O!.
-;1xJ \
\
\GIZ,APHIC.I\L c..1~tt.IL-: \
<Q.
£.: I. 7S-
\\ . ,
L'I<J
/'Vi ~1.o8
/'
\j
27
0 PI P2 P- -150 1.38 -1.05 0.33
300 2.67 -1. 82 0.85
450 3.78 -2.10 1.68
600 4.63 -1.82 2.81
750 5.16 -1. 05 4.11
900 5.35 0 5.35
1050 5.16 +1.05 6.21
1200 4.63 1.82 6.45
1350 3.78 2.10 5.88
1500 2.67 1.82 4.49
1650 1.38 1.05 2.43
112.50 4.94 1.48 6.42
APPENDIX B - Continued
P = EI Q Vt
XdIsin 0 + (~ -~) Vt2 sin 20
XQ XdI 2
p = (1.03) (1.08) sin 0 + (~ - .1 ).208 .828 .208
(1.08)2 sin 202
P = 5.35 sin 0 - 2.099 sin 20
28
BY DATE PROJECTISHEE1?.---1=OF-
CHKD BY DATE FEATURE
DETAILS
0eo-
I
I
I'~
- -t -
;-+ :-~ Q
I ~)1£~\IIt
~IIj 04..~:J it! 0
~ir~\JJ
APPENDIX B - Continued
7-1654 (7-73)Bureau of Reclamation
COMPUT It TION SHEET
. ~ ~~---
t8
fA
1\0 ~"'t" c\C
~(LQ.
29
APPENDIX B - Continued
Now convert °c to per unit cycle value
°c = 1400per unit °c = 1400 = 0.388JOtr
Now from oscillograph records
Test #1:
0.1 pu cycle point occurs at 7th cycle of fault. Therefore, thesystem is stable
Test #2:
0.22 pu cycle point occurs at approximately the 7th cycle of fault.Therefore, the system is stable.
Note: From the projected point on the next page, the machine wouldnot be stable beyond cycle #8
30
APPENDIX B - Continued
Test #2 Frequency Data
Cycle # Freq. Period (pu) L fj. .( L fj. .(pu
1 60 1 0
2 60 1 0
3 60.5 .99 .01 4°
4 61 .98 .03 11°
5 63 .95 .08 29°
6 65 .92 .16 58°
7 67 .90 .26 94°
81 69 .87 .39 140°
(..~
'"
H~ ~+
"*'
,,"0
/,
/
/ ~ 'PRon~~n' ",'NT
~ ~ 4 :;' b 7 ~
c..Y"I..E. ro.
1Projected point
31
APPENDIX B - Continued
Now, assume the soft shaft decouples the generator from the wind turbine andHg~n = 0.823 second. One can estimate the critical clearing time from thesWlng equation as follows:
2 Hgen 02 0= Pa ~ Pstored in soft shaft spring ~ Pout ~ constant
wr ot2
020= 0.8 (30 * 2~)
ot2 2 (0.823)* 57.3 degrees/rad
020= 5250
ot2
Solve for o(t) critical
o(t) = 00 + 5250 t22
1400 = 300 + 2625 t2
t = 0.2 second
I
or ~ 12 cycles[
Note, this is somewhat higher than that obtained from the critical clearingangle and oscillograph data. This is due to the neglect of transmissionline and transformer impedances in the critical clearing angle calculationsand in ignoring the wind turbine effects in the solution of the swinqequation. Both of these simplifications will result in an optimistic valueof the critical clearing time as shown above.
32
APPENDIX B - Continued
3' 1~ p.~L..,..
0-3+.'S"\(V-
)(,-:D.'3~~\.J.0""
\OO'M"'A~AS£.
~ ~~
X'd = 20.8%
Xd = 215.4%
5 MV.A Base
Zbase = 11.9025 g (100 MV.A Base)
Xl = 3.8338 g
X"d = 11.4%
Zbase = 238.05g (5 MV.A Base)
T'do = 7.5 s
Tld = 0.72 s
T"d = 0.05 s
11 = 10.114 + .0555 + 0.0161
1=0.1856
= 5.3879%
Ib ase = 5000 = 693.93 A4.16 13
11 = 3739 A IR 1 - 3739e ay -
240= 15.58 A
IOC unit + 1.50 (15.58) = 23 A
PTI recommended an IOC setting of 22 A. We concur.
33
APPENDIX B - Continued
Ifault svu line
T
peak to peak + 261 + 849 ~ 1110 A
rms value of sym wave = 0.5 (1110)/'2= 392 A
d-c offset = 849 - 11102
= 294 A
rms value of asym wave = [2942 + 3922]1/2
= 490 A
I @ 4.16 kV = 490 ( 34.5 ) = 4064 A4.16
Irelay = 4064/240 = 17 A
34
BY DATE PROJECTlSHEET _OF-SJT 6-6-80 Missouri River Basin Project
CHKD BY DATE FEATURE Medicine Bow Hamilton Standard WTS-4 WindWRR 6-6-80 Turbine SVU (System Verification Unit)
DETAILSReactance Diagram -- Interconnected Power System
APPENDIX B - ContinuedCOMPUTATION SHEET
1< u.s. Government Printing Office: 1977 -77 9 -6 51
Xl = X2 = 0.1181
~ Xo = 0.1121~
Note: All reactances are inper unit on a 100 MV.Abase
115 kV
Xl = X2 = 0.2487""'
0.7461
115 kV
6.9 kV J- *
34.5 kV +6
XS":
~\~1= X2 = 0.3040
I Xo = 0.9120XH=1. 0380
XL= 0.3550 Laramie 115 kV
XM=-0.0250 Xl = X2 = 0.2833Medicine ~Bow 34.5 kV ~~'lXO = 0.8499
1Xl = X2 = 0.3221
J Xo = 0.9662
Bow 115 kV
jt}XI = X2 = Xo = 1.110
SVU 4.16 kV
~~
Xl = X2= 0.0724 "'-
Xo = 0.0843
Cheyenne115 kV
SVU 34.5 kV
}
XI = X2 = 2.920
Xo = la~ge value(hlgh resistancegrounded generator)
* Transformer HV windingneutral to be groundedfor system operationwith WTS-4 wind turbinein service.
35 GPO 845-555
Mission of the Bureau of Reclamation
The Bureau of Reclamation of the U.S. Department of the Interior is responsible for the development and conservation of the Nation's water resources in the Western United States
The Bureau's original purpose "to prorrde for the reclamation of arid and semiarid lands in the West" today covers a wide range of interre- lated functions These include providing municipal and industrial water supplies; h ydrvelectric power generation; irrigation water for agricul- ture; water quality improvement' flood control; river navigation; river regulation and control; fish and wildlife enhancement; outcloor rmrea- tion; and research on water-related design, construction, materials, atmospheric management, and wind and solar power.
Bureau programs most frequently are the result of close cooperation with the U.S. Congress, other Federal agencies, States, local govern- ments, academic institutions, water-user organizations, and other concerned groups
A free pamphlet is available from the Bureau entitled "Publications for Sale." It describes some of the technical publications currently available, their cost, and how to order them. The pamphlet can be obtained upon request from the Bureau of Reclamation, Attn D-922, P 0 Box 25007, Denver Federal Center, Denver CO 80225-0007.