72.5 kv catalog
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LW30-72.5 Outdoor HV SF6 Circuit Breaker
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1 .General 1.1.1 LW30-72.5 Outdoor HV SF6 Circuit Breaker
is of 3-phase, AC, 60Hz high-voltage switchgear,
used for the control and protection of 72.5kV
power distribution and transmission system, aswell as being used as the network interconnected
circuit breaker and in the places switching
capacitor bank.
1.1 LW30-72.5 60Hz 72.5kV
1.2 The LW30-72.5breaker is incorporated withCT26 spring operating mechanism.
Self-energized arc control principle is adopted.
The breaker has won a national patent which No.
is ZL01 2 62031.9.
1.2 LW30-72.5+ CT26ZL01 2 62031.9
1.3 The breaker conforms to IEC62271-100:2001and GB1984-2003 about high-voltage alternating
current circuit breakers.
1.3 GB1984-2003 IEC62271-100:2001100
1.4 Main characteristics
The breaker provides the following advantages:
Self-energized arc control principle, excellent
breaking capacity; short arcing time, long
electrical life, low operation noise; Adopting SF6
as the insulating medium, no danger of fire and
explosion, could be used for the population dense
area; Spring operating mechanism is incorporated
to provide simple and compact structure, safe and
reliable operation.
1.4 : SF6
1.5 Working conditions
1.5.1 Ambient temperature: -30+40(-40+40 for special order)
1.5.2 Altitude: 2500m1.5.3 Air humidity
Relative humidity at average per day: 95%Relative humidity at average per month: 90%1.5.4 Max. wind velocity: 35m/s
1.5.5 Thickness of the ice covered: 10mm
1.5.6 Seismic intensity:Horizontal acceleration: 0.3gVertical acceleration: 0.15g
1.5 1.5.1 -30+40
-40+401.5.2 2500m1.5.3 95%
90%251.5.4 700Pa1.5.5 10mm1.5.6 0.3g
0.15g
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1.5.7 Sunshine intensity: 0.1w/cm2
(at wind velocity of 0.5m/s)
1.5.8 Max. daily temperature rise: 251.5.9 Symmetrical Creepage distance: 31mm/kV
1.5.10 Keep the breaker away from places withcombustible, explosive, corrosive materials
and violent vibrations.
1.5.7 0.1W/cm2( 0.5m/s)
1.5.8 251.5.9 31mm/kV1.5.10
2. Main technical parameters 2.2.1 Main technical data of the breaker are shown
in table 1.
2.1 1
Table 1 1No. Name Unit LW30-72.51
Rated voltage kV 72.52
Rated current A 31503
Rated short-circuit breaking current(Ie) kA 40 31.54
Rated short-circuit making current (peak) kA 100 805 Rated short-time withstand current(4s) kA 40 31.56
Rated peak withstand current kA 100 807
Short-line fault breaking current kA Ie90 Ie758
Out-of-phase breaking current kA Ie259
Rated pressure of SF6 gas
SF620 MPa 0.5 0.3810
Alarm pressure of SF6 gas20 MPa 0.45 0.3411
lock pressure of SF6 gas20 MPa 0.4 0.312
Rated line-charging breaking current A 50
13
Rated lightning impulse withstand voltagePhase-to-phase or phase-to-earth kV 350Across open contacts kV 410
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14
1 min. power frequency withstand voltage
Phase-to-phase or phase-to-earth
kV 160Across open contacts
kV 20215
Rated operating sequence
O-0.3s-CO-180s-CO16
Radio interference level
uV 50017
Close time
ms 951518
Open time
ms 33719 Total breaking time ms 6020
Opening asynchronism among phases
ms 321
Closing asynchronism among phases
ms 522
First-pole-to-clear factor
1.523
Resistance of main circuit
60
24
Accumulative breaking times under
rated short-circuit breaking current
times 20
25Mechanical duration
times 1000026
SF6 gas leakage
SF6 /year 127
moisture content of SF6 gas(20)SF6(20) v/v 15010-6
28 Weight of SF6 gas for one set CB SF6 kg 12 1029
Temperature class
-30+40 -40+4030
Weight of one CB
kg 108831
Heater voltage
V AC220
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3. Structure and working principle 3. 3.1 The three phases that are separated share one
common support and one CT26 spring operating
mechanism. The output bent arm of the mechanism
is connected with the circuit breaker through the rod.
The circuit breaker is composed by the interrupter,
pedestal, support and mechanism operating box. See
the details in fig1.
3.1 CT26 1
3.1.1 Interrupter
The interrupter adopts self-energizing theory. It
is the most important part of the circuit breaker
and is consist of the fixing contact support, fixed
contact, fixed arcing contact, moving contact,
moving contact support, moving arcing contact,
gas cylinder, nozzle and middle contact. The fixed
contact is fixed on the upper connection board.
The fixed contact support is filled with F-03
absorbent. The moving contact is fixed on the
lower connection board and is connected with the
wheel box through the insulating rod. See the
details in fig2.
3.1.1 F-03 2
3.1.2 Connection board (terminal.)
The connection board divides into the upper connection
board and the lower connection board. One connection
board has two terminals. Connection should be made
according to requirements. The connection board is
made of aluminum cast with silver. Dimension of the
connection hole is shown in fig.3.
3.1.2 3
3.1.3 Post bushing
The post bushing, under the interrupter, acts as a
support to the interrupter and the insulation to
the earth. It has high intensity and excellent air
tightness.
3.1.3
3.1.4 Wheel box
The wheel box, under the post bushing, delivers
the motion of the operating mechanism into gas
department to open or close the circuit breaker.
The type O shaped seal ring enclosed the SF6
gas in the wheel box. There are automatic cutout
valves on the side of wheel box. These valves are
3.1.4 OSF6
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sealed when the connecting pipe is unconnected.
The thimbles in the connecting pipes will open
the valves to guarantee that the three gas
departments are connected when the connecting
pipes are connected.
3.1.5 Pedestal
The pedestal props the circuit breaker and
connects with the operating mechanism. It
carries operating load of the circuit breaker. A
gas density-pressure gauge is installed under the
pedestal to monitor the SF6 gas pressure.
3.1.5 SF6 SF6
3.1.6 Mechanism operating box
The Mechanism operating box that is fixed on the
pedestal is enclosed with CT26 spring operating
mechanism and secondary control panel. The
output bent arm of the mechanism is connected
with the bent arm of the wheel box under the
middle phase through the rod. There are two40incoming holes at the bottom of the operating
box.
3.1.6 8 M16 CT2640
3.2 Working principles 3.2 3.2.1 Working principle of interrupter
It is of the self-energized arc-distinguishing principle.
When breaking small inductive and capacitive
current or rated current, the gas pressure in the
cylinder and that out of the cylinder differs due
to the mechanical motion of the moving contact,
which distinguishes arcing.
When breaking short-circuit current, arc is
burning between the moving arc contact and the
fixed arc contact, and SF6 gas in the cylinder is
expanded, which increases the difference of the
gas pressure in the cylinder and that out of the
cylinder. Arcing is distinguished when current is
over zero.
3.2.1
SF6
3.2.2 Spring operating mechanism 3.2.2 The structure and the action principle are shown in fig.4. 4
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3.2.2.1 Charging motor 3.2.2.1It adopts HDZ electromotor that can use DC or
AC power. The main data are shown in table.3.
HDZ 3.
Table3 3Rated operating voltage V
V DC: 220 AC:220Rated current of the motor A
A 2.8Range of the normal operating voltage
85%~110% rated operating voltage
85%110%Charging time at rated operating voltage sS Less than 15
Power of the charging motor
600W
3.2.2.2 Closing electromagnet 3.2.2.2It adopts solenoid type electromagnet. The main
data are shown in table.4. 4
Table4 4Rated operating voltage VV -110 -220Rated operating current AA 3.3 2.3
Resistance of the coil (20) 20 33 94
Range of the normal operating voltage 85%~110% rated operating voltage85%110% 3.2.2.3 Opening electromagnet 3.2.2.3It adopts solenoid type electromagnet. The main
data are shown in table.5.
5
Table5 5Rated operating voltage VV -110 -220
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Rated operating current AA 5.8 2.8Resistance of the coil (20)
20 19 78
Range of the normal operating voltage65%~120% rated operating voltage; no opening in
continuous 3 operations at less than 30% rated voltage65%120% 30% 3
3.2.2.4 Auxiliary switch
F9-28I type auxiliary switch that has 14 couple of
N/O contacts and 14 couple of N/C contacts is
adopted. The continuous current of the contact is
not less than 10A.
3.2.2.4 F9-28 14 14 10A
3.2.2.5 Travel switch has a couple of N/O contact
and a couple of N/C contact. The continuous
current of the contact is not less than 5A.
3.2.2.5 5A
3.2.2.6 The continuous current of the connection
terminal is not less than 30A.
3.2.2.6 30A
3.2.2.7 Electric principle and wiring of the circuit
breaker are shown in fig11 and fig 11.1.
3.2.2.7 1111.1(
3.2.2.8 Charging of the operating mechanism
Closing spring is at uncompressed station. Theratchet pawl shaft(6) is connected with the
electromotor by gears. See the details in fig 4(A).
3.2.2.8 (1)(6) 4(A)
When charging, the electromotor forces the
ratchet shaft (6) to rotate clockwise; the two
ratchet pawls(5) on the ratchet shaft push the
ratchet wheel(3) to rotate counter clockwise
alternately to drive the dowel and rod on ratchet
wheel to compress the closing spring; the closing
spring drives the ratchet wheel to turn counter
clockwise about 2when the dowel reaches the lefttop point, and the charging holding dowel(4) onthe ratchet wheel is buttoned by the holding
detent(15) to finish charging. The electromotor is
cut off and the ratchet pawl departs from the
ratchet wheel at this time.
(6) (5)(3) 2 (4) (15)
3.2.2.9 Closing operation
The closing spring is charged when the breaker is
at opening state. See the details in Fig 4(B).
3.2.2.9 4B
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When the mechanism receives the closing order, the
closing coil is to be electrified and the attraction of
the moving iron core of the closing electromagnet
drives the closing conduct rod to strike the closing
detent (13) to rotate counter-clockwise and releasesthe energy holding detent (15). Then, the closing
spring drives the ratchet to rotate clockwise with
high speed, and the cam(18)that is coaxial with the
ratchet beats the roller on the large bent arm(8)to
force the output bent arm (7) to move upward and
complete closing. At that time, the opening spring is
compressed to store energy to prepare for the
opening operation.
(13)(15) (3) (18)(8) (7) (16)
The closing operation can also be realized by attacking
the conduit of closing electromagnet by hand.
After finishing the closing operation, motor begins to
store energy for the closing spring again. The state of
the mechanism at this time is shown in Fig 4C.
4C
3.2.2.10 Opening operation
Both of the closing spring and opening spring are
charged when the breaker is at closing state.
3.2.2.10 (1)(16) 4(C)
When the mechanism receives the opening demand,
opening coil is to be electrified and the attraction of
the moving iron core of opening electromagnet drives
the opening conducted rod to strike the opening detent
(10) to revolve counter clockwise and releases the
closing holding detent (9).The opening spring drives
the bent arm to turn clockwise to force the main part
of the breaker to complete opening operation and the
large bent arm to move downward to press down the
closing holding detent to make the mechanism at the
opening state, see the details in Fig4 (B).
(10) (9) (16)(8) (9) 4(b)
The opening can also be competed by attacking
the conduit of opening electromagnet by hand.
3.2.2.11 Bound-resistant device
This mechanism is equipped with mechanical
bound-resistant device. Electrical bound-resistant
3.2.2.11
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device is also on requirement. 3.2.3 The circuit breaker is designed with SF6
density-controller gauge with automatic monitor
function to the temperature compensation. Thegauge can not only display the pressure of SF6
gas but also amend the affect of pressure
difference arising from temperature change. The
gauge will send out alarm signal when the
pressure of gas in circuit breaker is lower than
the alarm value. The gauge will send out locking
signal when the pressure of gas in circuit breaker
is lower than the locking value.
3.2.3 SF6 SF6 20
4. Packing, transportation, check before
acceptance and storage
4.
4.1 Packing, transportation: The CB is disjointed
to pack and transport. The accompanying
documents should be delivered to the user by the
transporting unit. The gas compartments are
filled with SF6 gas (0.05Mpa). The main body of
the circuit breaker is at closing state; the
mechanism is at opening state and uncharged.
The packages are forbidden to be overturned,
inverted, impacted.
4.1 : 0.05MPa()SF6
4.2 Check before acceptance
As the circuit breaker arrived, users should
check the accompanying documents first. Then
open the packages with the transporter and
check the circuit breaker and accessory
according to the packing list. Please contact the
manufacturer in time if you have any question.
Pay attention to the bushing of the circuit
breaker when you open the packages.
4.2
4.3 Storage: The circuit breaker should be stored
at drying ventilated house without pollution, if it
wont be installed at once. If it wont be installedfor a long term, periodical check is necessary.
4.3
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5. Installation and examining before
operation
5.
5.1 Foundation
The foundation dimension is shown in fig.8. The
height difference between the two sides of the
foundation should be within 2mm. The upward
dynamic loading is 20kN and downward dynamic
loading is 20kN.
5.1 8 2mm 20kN 20kN
5.2 Install the circuit breaker under the guidance
of manufacturers personnel(s).
5.2
5.3 Inflating:
5.3.1 The following procedure must be observed.
A. Lay the SF6 gas bottle on the ground, and
connect the pipeline to the decompression valve.
It is shown in fig.7.
B. Open the valve of gas bottle, then open the
pressure reduction valve to make the pressure at
low pressure side be 0.02~0.04MPa for 5-10
seconds to wash the pipeline.
C. Connect the pipeline to the automatic cutout
valve of drive box, then open the pressure
reduction valve slowly. The pressure difference
between pressure reduction valve and the circuit
breaker will not higher than 0.05MPa. When the
gas pressure of circuit breaker is near to the
rated value, inflating slowly to prevent too high
pressure.
D. Close the pressure reduction valve when the
pressure is equal to the rated filling pressure.
5.3 5.3.1 a. 7b. 0.02-0.04MPa 5-10 c. A 0.05MPad.
5.3.2 Adopting the leak hunting device with
sensitivity grade 10-6
to all the sealing planes after
the breaker is filled to the rated voltage. There
should be no leaking. Contact the manufacturer
immediately upon finding leaking.
5.3.2 10-6
5.3.3 Moisture Check 5.3.3 SF6
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Users should check moisture in 24 hours after
inflating. The measured values should be in accordance
with fig9 about the moisture content-temperature curve.
24 95.3.4 manual charging of the mechanism is shown
in fig.10. The circuit breaker could be adjusted
thrown into operation when is filled with SF6 gas.
Power must be cut off.
5.3.4 10
5.4 Checkup before operation
5.4.1 Leakage Detect
Adopting the SF6 detector with flexibility not
lower than 10-6
to check the flange linking planes
and the connectors of the linking pipe in 24 hours
at the finish of gas filling.
5.4 5.4.1 10-6atmm3/s 24
5.4.2 Moisture Measuring
Connecting the needled-shaped pressure reduction
valve to the self-sealing valve to control the gas flow.
Then using micro-moisture detecting instrument to
measure the moisture which should be within 15010-6(v/v) at 20 at checkup and 30010-6 (v/v) at 20during operation.
5.4.2 5.3.3 9 150L/L20300L/L20
5.4.3 Main-circuit resistance measuring
DC pressure deduction method is adopted. measure the
main-circuit resistance which should be within 60ubetween the upper and the lower connection boards
when connecting with 100A DC current at close state.
5.4.3 100A 60
5.4.4 Insulation Checkup
a. There should be no flash and abnormal noise
when applying power frequency voltage to the
main circuit.
b. There should be no penetrationflash andother abnormal situation when applying 2000V of
power frequency voltage to the secondary circuit
for 1 minute, excluding the relay coil motor.
5.4.4a.
b. 2000V-1min
5.4.5 Measuring the opening and closing
synchronism and time under the rated operating
voltage.
5.4.5 ,
5.5 D04 moisture-resistant glum should be
smeared between the mechanical box and the
5.5 DO4
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transition support. DO45.6 Connection of the Primary bus bar of the
Main Circuit and the Earthing Line
5.6
5.6.1 The incoming line and the outgoing line ofthe primary bus bar should be connected to the
upper and lower connection boards respectively.
The dimension of the open hole on the connection
board is shown in Fig3. The connection board
should be wiped with the white cloth submerged
with alcohol, while emery cloth is forbidden,
before connecting.
5.6.1 3
5.6.2 The earthing line should be connected to the
earthing bolt (with earthing symbol) on the
support.
5.6.2
5.7 Connection of the Secondary Circuit
Taking off the rubber glove under the mechanical
box and mounting with GBL connector which is
to be penetrated with incoming cable and
phase-to phase cable. Fig11 11.1 show thesecondary connection. The lead area should be
within 2.5 mm2.
5.7 11 11.1
5.8 Then it is the time to throw the breaker into
operation as soon as cleaning the site.
5.8
6. Maintenance and repair 6.6.1 Daily Maintenance
Do the following work one time every week:
a. observing and recording the gas pressure to see
whether it is normal
b. observing and the close and open indication
positions
c. observing the internal part of the breaker to
make sure there are no abnormal noise and over
heating
d. observing the motion of the mechanism to
make sure they are normal
e. checking the fixed nuts to make sure their
6.1 SF6a.b.c.d.
e.
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fixedness.
6.2 annual check of circuit breaker
Short-time power cut and cut-down of the control
power should be guaranteed during annual
maintenance.
6.2
6.2.1 Clean the dirts on the surface of the porcelain.
6.2.2 Measure the micro-water content of the gas in
the breaker, and make a record.
6.2.3 Check the fixed nuts to make sure their
fixedness.
6.2.4 Check the upper and lower connection boards to
see whether there are overheating and color changed,
if do, using abrasive that is less than 250# to wipe the
boards then fixing the primary bus bar again.
6.2.5 The above procedure of the annual maintenance
could be done simultaneously and have no order.
6.2.1 6.2.2 6.2.3 6.2.4 250#6.2.5
6.3 supply the gas
If the density-pressure meter sends out an alarm
single during operation, gas should be supplied
during operation.
6.3
6.4 notes during check and repair 6.4 6.4.1 Closing or opening is forbidden when the
breaker is at vacuum state to avoid damaging the
parts of arc control device.
6.4.1
6.4.2 Lubricate the driving bent arm the rolling
parts.
6.4.2
6.4.3 Release the spring energy during examining
and repairing the mechanism. The way to release
energy is: do one cycle closing and opening
operation with power off.
6.4.3
7. Repair parts, special tools and accessories 7.7.1 repair parts
The repair parts were provided by the
manufacturer on users order. Table 6(1)62andtable 7 show the spare parts to be selected. The
7.1 6162 7
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quantity regulated in the table in only for reference. Table6(1) 6(1)
No.Code No.
Name and specification
Quantity
Remark
1 5TK.177.007GGas-filling pipe
1
It should be connected with
pressure reduction valve in one end
and self-sealing valve in the other
end when filling gas to the breaker
2 5TK.253.027Special spanner1
1 1For manual charging
3 5TK.177.007
Connector for measuring
moisture
1
One end should be connected tocircuit beaker and the other should
be connected to the cone-shaped
pressure reduction valve.
Table6(2) 6(2)No. Code No. Name and specification Quantity Remark1
D04 water resistant glueD04FQ 2 Apply it on the water-resistant place2
7501 vacuum silicon grease
7501 1 Used for the gas seal gasket3
M2060 bolt ,flat washer andflexible washer
M2060 12 of eachUsed for the protection cover
of the support7.2 Spare parts providing according to the
contract
7.2
Table 7 7No. Type designate Name Quantity1 5TK.520.051.34 Opening and closing coils One for each1 HDZ-26005A
Motor 13 TZ7311
Travel switch 14 3TH30 22-1XM4 DC contactor 1
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7.3 Accessories providing according to the
contract7.3
No.
Type designate
Name
Quantity
Remark
1 LF-1
SF6 detector 1 For detecting leakage2 DWS-
moisture measuring instrument
matched with cone-shaped pressure
reduction valve1
For measuring moisture3
SF6 gas
SF6 1 bottle For filling and evacuating4 YQY-07
Oxygen pressure reduction valve 1 For filling and evacuating5 2X-4
Vacuum pump 1For pumping
during maintenance8. Notice for Order
Please specify the following items when ordering.
a. type designate of the breaker and the mechanism
b. ratings including voltage, current, breaking
current and so on
c. ambient temperature
d. closing and opening operating voltage of the
operating mechanism, and the working voltage of
the charging motor
e. outgoing direction of the bus bar terminals
f. spare parts, auxiliaries, abbreviation, code No,
Quantity
8.a.b.()c.d.e.f.
9. Documents accompanying the machine
a. one copy of packing listb. one copy of qualification certificate
c. one copy of manual instruction.
9. a.b.c.
10. Drawings
See the drawings of Fig1 through Fig 12 in the
Appendix.
10. 1 12
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