areva mwtu 11
TRANSCRIPT
Type MWTU 11Forward and Reverse Power Relay
2
Type MWTU 11Forward and Reverse Power Relay
ApplicationsThere are two versions of theMWTU 11 available; one for powermeasurement (W) and one forreactive power measurement (VAR).
The MWTU 11 is suitable for thefollowing applications:
Reverse power protection of agenerator against motoring
The relay has sensitive settings andoperates accurately for boundaryconditions up to ±87.1° (0.05power factor). The definite timecharacteristic ensures thatmaloperation does not occur due tomomentary power reversals duringsynchronising or power swings onthe system. Trip output connectionsshould be made to the set of time-delayed output contacts.
Figure 1: MWTU 11
Limitation of power importedfrom a consumer by a utilitypower supply
This application is an over power orforward power function in whichhigher settings are required.The directional discrimination is notrequired at such low power factorsfor reactive components as high as60% of the generator rating.The operating time of the relay isnot critical as fast tripping times arecovered by fault detecting relays.
Reverse VAR connections
The single phase VAR relay may beused with a quadrature connectionto measure reactive power.
Features• Wide power setting range
• Accuracy maintained at lowpower factors
• Non-volatile trip indication
• Measures forward and reversepower
• Instantaneous element
• Low burden
3
Figure 3: Instantaneous element disengaging times.
Figure 2: Instantaneous element operating times.
DescriptionThe MWTU 11 is a single phaserelay measuring I Cos φ, offering awide power setting range (from 1%to 32.5% of rated power.
A low quiescent current supply drainis achieved by use of a switch modepower supply. This allows the relayto work over a wide auxiliaryvoltage range and to be operatedfrom either ac or dc supplies. It alsogives 2kV isolation. A green LEDindicates that a supply is present onthe relay terminals.
The time delay starts from either theoperation or the reset of theinstantaneous element, allowing theMWTU 11 to be used for eitheroverpower or underpowerapplications. A non-volatile tripindication is given by a red LED anda reset push-button resets thebistable relay and trip indicator.
0 2 4 6 8 10 12 14 16 18 200
200
400
600
800
1,000
1,200
1,400
1,600
Time
(ms)
Current as multiple of Ps setting
Ps = 32.5%Ps = 16%Ps = 10%Ps = 5%Ps = 3%Ps = 1%
0 5 10 15 20 25 30 350
100
200
300
400
500
600
700
800
900
1,000
Time
(ms)
Ps setting (%Pn)
4
Figu
re 4
: Ty
pica
l app
licat
ion
diag
ram
– p
hase
to
phas
e re
vers
e po
wer
con
nect
ion.
L NV
AC
Not
es:
1.(a
)CT
shor
ting
links
mak
ebe
fore
(b) a
nd (c
) disc
onne
ct.(b
)Sh
ort t
ermi
nals
brea
k bef
ore
(c).
(c)
Long
term
inal
.(d
)Pi
n te
rmin
al (P
CB ty
pe).
2.CT
con
necti
ons a
re ty
pica
l onl
y.3.
VT c
onne
ction
s are
typi
cal o
nly.
4.Ea
rthin
g co
nnec
tions
(CTs
) are
typi
cal o
nly.
IN
Dire
ction
of p
ower
flow
for
insta
ntane
ous r
elay o
pera
tion
A B C
P2P1
S2S1
AB
C
ab
c27 28
(See
note
2)
21 22 23 25
(See
note
4)
(See
note
3)
9 10 13 14
Powe
rsu
pply
circu
its
VN
P S
V ref
f(a>b
)a b
RL1 2
tRL
2 2 RL3 1
Rese
tRese
t
Op
Trip
Powe
r
Phas
ese
nsitiv
ebr
idge
A
CB
Phas
e ro
tatio
n
20 17 19
RL2–
1
15 16
RL2–
2
6 2 4
RL1–
1
1 5
RL1–
2
Insta
ntane
ous
conta
cts
MW
TU 1
1
+VE
–VE
VX
8
Mod
ule
term
inal
blo
ckvi
ewed
from
rear
Case
ear
th
56
1314
1516
12 4
17 1920
2122
23 25 27288
910
Time-d
elaye
dco
ntacts
Case
ear
th co
nnec
tion
5
Figu
re 5
: Ty
pica
l app
licat
ion
– ph
ase
to n
eutr
al r
ever
se p
ower
con
nect
ion.
Not
es:
1.(a
)CT
shor
ting
links
mak
ebe
fore
(b) a
nd (c
) disc
onne
ct.(b
)Sh
ort t
ermi
nals
brea
k bef
ore
(c).
(c)
Long
term
inal
.(d
)Pi
n te
rmin
al (P
CB ty
pe).
2.CT
con
necti
ons a
re ty
pica
l onl
y.3.
VT c
onne
ction
s are
typi
cal o
nly.
4.Ea
rthin
g co
nnec
tions
(CTs
) are
typi
cal o
nly.
IN
Dire
ction
of p
ower
flow
for
insta
ntane
ous r
elay o
pera
tion
A B C
P2P1
S2S1
AN
27 28
(See
note
2)
21 22
(See
note
3)
VN
P S
V ref
f(a>b
)a b
RL1 2
tRL
2 2 RL3 1
Rese
tRese
t
Op
Trip
Phas
ese
nsitiv
ebr
idge
A
CB
Phas
e ro
tatio
n
MW
TU 1
1
an
N
23 25
L NV
AC
(See
note
4)
9 10 13 14
Powe
rsu
pply
circu
its
Powe
r
+VE
–VE
VX
8
Mod
ule
term
inal
blo
ckvi
ewed
from
rear
Case
ear
th
56
1314
1516
12 4
17 1920
2122
23 25 27288
910
20 17 19
RL2–
1
15 16
RL2–
2
6 2 4
RL1–
1
1 5
RL1–
2
Insta
ntane
ous
conta
cts
Time-d
elaye
dco
ntacts
Case
ear
th co
nnec
tion
6
Figu
re 6
: Ty
pica
l app
licat
ion
diag
ram
– p
hase
to
phas
e re
vers
e VA
r co
nnec
tion.
Not
es:
1.(a
)CT
shor
ting
links
mak
ebe
fore
(b) a
nd (c
) disc
onne
ct.(b
)Sh
ort t
ermi
nals
brea
k bef
ore
(c).
(c)
Long
term
inal
.(d
)Pi
n te
rmin
al (P
CB ty
pe).
2.CT
con
necti
ons a
re ty
pica
l onl
y.3.
VT c
onne
ction
s are
typi
cal o
nly.
4.Ea
rthin
g co
nnec
tions
(CTs
) are
typi
cal o
nly.
IN
Dire
ction
of p
ower
flow
for
insta
ntane
ous r
elay o
pera
tion
A B C
P2P1
S2S1
BC
27 28
(See
note
2)
21 22
(See
note
3)
VN
P S
V ref
f(a>b
)a b
RL1 2
tRL
2 2 RL3 1
Rese
tRese
t
Op
Trip
Phas
ese
nsitiv
ebr
idge
A
CB
Phas
e ro
tatio
n
MW
TU 1
1
bc
L NV
AC
9 10 13 14
Powe
rsu
pply
circu
its
Powe
r
+VE
–VE
VX
8
Mod
ule
term
inal
blo
ckvi
ewed
from
rear
Case
ear
th
56
1314
1516
12 4
17 1920
2122
23 25 27288
910
20 17 19
RL2–
1
15 16
RL2–
2
6 2 4
RL1–
1
1 5
RL1–
2
Insta
ntane
ous
conta
cts
Time-d
elaye
dco
ntacts
(See
note
4)
Case
ear
th co
nnec
tion
7
Technical Data
Ratings
AC current (In) 1A or 5A
AC voltage (Vn)
Operative range 70% to 120%Vn
Power relay Rating Operative range (V)
Phase to neutral 57.7/63.5 40.4 – 76.269.3 48.5 – 83.2220/240 154 – 288
Phase to phase 100/110 70 – 132120 84 – 144380/415 266 – 498
VAR relay phase to phase 110 77 – 132120 84 – 144
Auxiliary voltage Nominal Operative range (V)(Vx) dc ac24/54 19 – 72 19.2 – 28.848/125 37 – 150 38.4 – 83.2110/250 87 – 300 80 – 144
Frequency 50/60Hz
Characteristics
Characteristic quantity I Cos φ
Relay characteristic angle 0°
Burdens
AC voltage burden Less than 1VA per phase
AC current burden Less than 0.1VA for 1A relays andless than 0.2VA for 5A rated relaysat unity power factor and at ratedcurrent on any setting.
DC supply burden Maximum burdens over fulloperative range.
Voltage Quiescent Both outputrating (W) relays(Vx1) operated
(W)24/54 1.5 548/125 1.5 6110/250 2.5 6
AC supply burden Maximum burdens over fulloperative range.
Voltage Quiescent Both outputrating (VA) relays(Vx2) operated
(VA)24 1.5 5.548/69.3 2.5 6.5100/120 3.5 8
8
Setting ranges
Power setting 1% to 32.5% Pn in 0.5% Pn steps
Time delay 0.25s to 32s in 0.25s steps
The time delay may be set to startfrom the operation or reset of theinstantaneous element.
Operating time characteristics
Instantaneous operate time 7.4at RCA VnIs(I – 1) ms
where Is =PsVn
and I = multiples of Is
See Figure 2
Instantaneous resetting anddisengaging times at RCA The disengaging time at RCA, as
the current is switched off, dependson the power setting Ps and isshown in Figure 3.
Time delayed reset anddisengaging times at RCA Less than 10ms from when the
instantaneous output elementoperates or resets as applicable.
Reference conditions for accuracy claims
Power setting (Ps) 16% Pn
Voltage 100% Vn(For relays covering more than onenominal voltage range the referencecondition is the highest nominalvoltage).
Time delay 4s
Ambient temperature 20°C
Frequency 50Hz or 60Hz
DC auxiliary voltage Rating Reference
24/54V 24V48/125V 48V110/250V 110V
AC auxiliary voltage 24V 24V48/69.3V 48V100/120V 100V
9
Accuracy under reference conditions
I Cos φ at RCA Over the operative range of Ps to20Ps subject to a maximum currentof 2In.
±3% of the setting ±2mA(for In = 1A) or ±10mA (for In 5A)whichever is the greater.
Boundary of operation φ = ±1.5° at system angles between±80° and ±87.1°
φ = ±5°or ±5% I Cos φ(whichever is the greater) at systemangles between ± 80° from RCA
Note: The boundary of operationwill not exceed ±90°from RCA.
Instantaneous operating time ±10% or 15ms whichever is thegreater, over the operative range of2Is to 2In
where Is =PsVn
and I = multiples of Is
Operating time ±5% or 50ms whichever is thegreater.
Repeatability better than 1%
Setting time better than 1%
Resetting value The relay will reset when the powerin the operating direction is lessthan 97% Ps.
Directional stability The relay will remain stable for 20times In in the restrain direction 20times In with Vn = 0V
Accuracy variation with influencing conditions
Ambient temperature
Operative range –25°C to +55°C
I Cos φ at RCA Less than 0.05%/°C
Accuracy of boundaryof operation φ = ±1° at system angles between
±80° and ±87.1°
φ = ±3° at system angles between±80° from RCA
Variation in operating time Less than 0.1%/°C
10
Frequency
Operative range 47 – 52Hz or 57 – 62Hz
I Cos φ at RCA ±1%
Accuracy of boundaryof operation φ = ±1% at system angles between
±80° and ±87.1°
φ = ±3° at system angles between±80° from RCA
Variation in operating time ±1%
I Cos φ at RCA ±2%
Contacts
Instantaneous 1 changeover and 1 normally open
Time delayed 1 changeover and 1 normally open
Make and carry for 0.2s 7500VA subject to a maxima of30A and 300V ac or dc
Carry continuously 5A ac or dc
Break ac 1250VAdc 50W resistive
25W L/R = 40mssubject to maxima of 5Aand 300V
Durability
Loaded contact 10,000 operations minimum
Unloaded contact 100,000 operations minimum
Current transformer requirements
IEC 60185 In = 1A 5VA class 1; maximum leadresistance 1.5Ω
In = 5A 10VA class 1; maximumlead resistance 0.3Ω
Voltage transformer requirements
IEC 60186 15VA class 1
See Figures 4, 5 and 6 for typicalapplication diagrams
11
Thermal withstand
Continuous withstand
Current 2 times rated value
Voltage 1.2 times rated value
Short time withstand
Current For 1s 100In with 400A maximum
For 3s 57In with 230A maximum
Operation indicators A green LED is used to indicate voltsare present on the relay and theinternal dc/dc converter isoperating.
The operation of the time delayedelement operates a red LED tripindicator. A latching relay is used toremember the state of the tripindicator, thus ensuring that the tripstate is not lost if the power to therelay fails. The reset push button onthe front plate resets the tripindicator.
High voltage withstand
Dielectric withstandIEC 60255-5: 1997 2kV rms for 1 minute between all
terminals and case earth.
2kV rms for 1 minute between allterminals of independent circuits,with terminals on each independentcircuit connected together.
1kV rms for 1 minute acrossnormally open contacts.
High voltage impulseIEC 60255-5: 1977 Three positive and three negative
impulses of 5kV peak, 1.2/50µs,0.5J between all terminals andearth.
12
Electrical environment
High frequency disturbanceIEC 60255-22-1: 1988 Class III 2.5kV peak between independent
circuits and case.
1.0kV peak across terminals of thesame circuit.
Fast transient disturbanceIEC 60255-22-4: 1992 Class IV 4kV, 2.5kHz applied directly to
auxiliary supply.IEC 60801-4: 1988 Level 4 4kV, 2.5kHz applied directly to all
inputs.
Surge immunityIEC 61000-4-5: 1995 Level 3 2kV peak, 1.2/50µs between all
groups and case earth.
2kV peak, 1.2/50µs betweenterminals of each group.
DC supply interruptionIEC 60255-11: 1979 The unit will withstand a 10ms
interruption in the auxiliary supply.under normal operating conditions,without de-energising.
AC ripple on dc supplyIEC 60255-11: 1979 The unit will withstand 12% ac
ripple on the dc supply.
AC voltage dipsIEC 61000-4-11: 1994 The unit will withstand dips of
100%, 60% and 30% Vx each of1.0s, 0.5s and 20ms duration.
AC voltage variationsIEC 61000-4-11: 1994 The unit will withstand voltage
reductions to 40% Vx and 0% Vxwith 2s ramp down, 1s at reducedvoltage, 2s ramp up times.
EMC compliance89/336/EEC Compliance to the European
Commission Directive on EMC isclaimed via the TechnicalConstruction File route.
EN 5008-2: 1994 Generic Standards were used toEN 5008-2: 1995 establish conformity.
Product safety73/23/EEC Compliance with the European
Commission Low Voltage Directive.
EN 61010-1: 1993/A2: 1995 Compliance is demonstrated byEN 60950: 1992/A11: 1997 reference to generic safety
standards.
13
Atmospheric environment
TemperatureIEC 60255-6: 1988 Storage and transit –25°C to +70°C
Operating –25°C to +55°C
IEC 60068-2-1: 1990 Cold
IEC 60068-2-2: 1974 Dry heat
HumidityIEC 60068-2-3: 1969 56 days at 93% RH and +40°C
Enclosure protectionIEC 60529: 1989 IP50 (dust protected)
Mechanical environment
VibrationIEC 60255-21-1: 1988 Response Class 2
SeismicIEC 60255-21-3: 1993 Severity Class 2
14
Figure 7: Case outline size 4
CasesType MWTU11 relays are housedin size 4 cases, see Figure 7
97
177
Push buttonprojection 10 max.
32 21225 min.
157 max.
11103
99
52
23.54 holes Ø 4.4
168 159
Panel cut-out:Flush mounting fixing details.
All dimensions in mm.
Flush mounting.
Reset
15
Information requiredwith orderVAR or power relay
Auxiliary voltage rating (Vx)
Phase to neutral voltage rating (Vn)
CT rating
St Leonards Works, Stafford, ST17 4LX EnglandTel: 44 (0) 1785 223251 Fax: 44 (0) 1785 212232 Email: [email protected] Internet: www.gecalsthomgpc.co.uk
©1998 ALSTOM T&D Protection & Control Ltd
Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, this brochure shouldonly be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product referred to in it.
ALSTOM T&D Protection & Control Ltd cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.
Publication R6127C 019910 CPS Printed in England.
ALSTOM T&D Protection & Control Ltd