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China LW39-126 Outdoor AC High Voltage SF6 Circuit Breaker Factory Suppliers for 110kV Power Systems
General
LW39-126 type outdoor AC high voltage porcelain SF6 circuit breaker is applied in power system with 50/60Hz frequency, 110kV system normal voltage. It is the main power equipment used in power plant and substation for control and protection.
LW39-126 type outdoor AC high voltage porcelain SF6 circuit breaker adopts thermal expansion self-arc-extinguish, filled with SF6 gas of well arc-extinguishing and electric insulation performance. All the seals adopt double-circle O type seal ring, which can effective prevent leakage; equipped with CT30 type spring operation mechanism, three phase mechanical linkage operation.
LW39-126 type outdoor AC high voltage porcelain SF6 circuit breaker adopts thermal expansion self-arc-extinguish, filled with SF6 gas of well arc-extinguishing and electric insulation performance. All the seals adopt double-circle O type seal ring, which can effective prevent leakage; equipped with CT30 type spring operation mechanism, three phase mechanical linkage operation.
Features
LW39-126 type outdoor AC HV porcelain SF6 circuit breaker is a new type HV SF6 circuit breaker with high performance, which is designed according to national standards and domestic industry manufacture level. The main features are as follows:
a. High breaking level, break reliably when outgoing terminal is in short circuit, out of phase and fault in near zone.
b. Structure of arc-extinguishing chamber is simple, reliable and convenient to maintain.
c. Long service life, have 20 times' breaking ability under full capacity and free of maintenance under normal operation in many years.
d. Light operation force, adopts simple, reliable and compact spring operation mechanism.
e. Rated charging pressure of gas is low and can be used in low temperature condition.
f. Small occupied area.
g. Low noise level and suitable to apply in residential area.
h. Long overhaul period and less maintenance.
i. Short installation time on the spot.
Service condition
Altitude |
≤ 3000m |
Ambient temperature |
-35℃～+40℃ |
Wind speed |
≤ 35m/s |
Daily temperature difference |
≤ 25℃ |
Sunlight temperature |
0.1w/cm2 |
Relative humidity |
Average (monthly): ≤ 90 Average (daily): ≤ 95 |
Ice thickness |
≤ 10mm |
Earthquake |
≤ 9° |
Pollution grade |
III or IV |
Main Technical Parameters
1.1 Main technical parameters of circuit breaker
No. |
Items |
Unit |
Parameters |
||
1 |
System nominal voltage |
kV |
110 |
||
2 |
Rated voltage |
kV |
126 |
||
3 |
Rated frequency |
Hz |
50/60 |
||
4 |
Rated current |
A |
3150 |
||
5 |
Rated short-circuit breaking current |
kA |
31.5 |
40 |
|
6 |
Rated short-circuit making current |
kA |
80 |
100 |
|
7 |
Rated short time withstand current |
kA |
31.5 |
40 |
|
8 |
Rated peak withstand current |
kA |
80 |
100 |
|
9 |
Rated duration time of short-circuit |
S |
4 |
3 |
|
10 |
First-pole-to-clear factor |
|
1.5 |
||
11 |
Lightning impulse withstand voltage |
kV |
650 |
||
12 |
1min power frequency withstand voltage |
kV |
275 |
||
13 |
Creepage distance fracture/to earth |
mm/kV |
25/31 |
||
14 |
Rated operation sequence |
|
O-0.3s-CO-180s-CO |
||
15 |
Making time |
ms |
≤ 110 |
||
16 |
Breaking time |
ms |
≤ 65 |
||
17 |
Closing-opening time |
ms |
≤ 85 |
||
18 |
Closing time |
ms |
80 ± 15 |
||
19 |
Opening time |
ms |
33 ± 7 |
||
20 |
Fracture quantity of per pole |
pc |
1 |
||
21 |
Main loop resistance |
μΩ |
≤ 45 |
||
22 |
Mechanical life |
times |
10000 |
||
23 |
|
Rated value |
Mpa |
0.55 |
0.60 |
Alarm value |
Mpa |
0.50 |
0.55 |
||
Interlock value |
Mpa |
0.45 |
0.50 |
||
24 |
SF6 moisture content |
ppm(V/V) |
≤ 150 |
||
25 |
Yearly leak rate of SF6 |
|
≤ 1% |
||
26 |
Charging SF6 gas weight of each circuit breaker |
kg |
7 |
9 |
|
27 |
Total weight of each circuit breaker |
kg |
2000 |
||
28 |
Static tension of circuit breaker connecting terminal |
longitudinal |
N |
1250 |
|
horizontal |
N |
750 |
|||
vertical |
N |
1000 |
|||
29 |
Voltage of auxiliary circuit |
V |
AC220 |
||
30 |
Closing coil |
rated voltage |
V |
DC220 |
DC110 |
rated current |
A |
2 |
3.3 |
||
Coil resistance under 20℃ |
Ω |
110 ± 5 |
33 ± 1.6 |
||
31 |
Opening coil |
rated voltage |
V |
DC220 |
DC110 |
rated current |
A |
2 |
5.8 |
||
Coil resistance under 20℃ |
Ω |
110±5 |
19±1 |
||
32 |
Energy Storage motor |
Voltage |
V |
AC220/DC220 |
|
Power |
W |
600 |
|||
33 |
Energy storage time |
S |
≤ 15 |
||
34 |
Heater |
Voltage |
V |
AC220 |
|
Power |
W |
100 |
|||
35 |
Standards |
GB1984 |
|||
1.2 Mechanical parameters of circuit breaker
No. |
Items |
Unit |
Parameters |
1 |
Closing asynchronous between phases |
ms |
≤ 5 |
2 |
Opening asynchronous between phases |
ms |
≤ 3 |
3 |
Contact travel of moving-contact |
mm |
38 ~ 42 |
4 |
Main drive lever travel of mechanism |
mm |
98 ~ 100 |
5 |
Travel of moving-contact |
mm |
118 ~ 122 |
Drawing
Drawing 1 LW39-126 External drawing of circuit breaker
Instruction:
1. Arc extinguish chamber
2. Support porcelain bushing
3. Beam
4. Post
5. Mechanism box
6. Charging & discharge self-sealing valve
7. Density controller
8. Nameplate
9. Closing & opening indication
1. Arc extinguish chamber
2. Support porcelain bushing
3. Beam
4. Post
5. Mechanism box
6. Charging & discharge self-sealing valve
7. Density controller
8. Nameplate
9. Closing & opening indication
Drawing 2
1.Upper wiring plate
2.Absorbing-type filler
3.Porcelain bushing of arc-extinguishing chamber
4.Compression cylinder
5.Piston
6.Lower collector
7.Lower wiring plate
8.Support porcelain bushing
9.Insulation pulling rod
10.Movable main contact
11.Movable arc contact
12.Arc-extinguishing spout
13.Static arc contact
14.Static main contact
2.Absorbing-type filler
3.Porcelain bushing of arc-extinguishing chamber
4.Compression cylinder
5.Piston
6.Lower collector
7.Lower wiring plate
8.Support porcelain bushing
9.Insulation pulling rod
10.Movable main contact
11.Movable arc contact
12.Arc-extinguishing spout
13.Static arc contact
14.Static main contact
Drawing 3
10.Movable main contact
11.Movable arc contact
12.Arc-extinguishing spout
13.Static arc contact
14.Static main contact
15.Thermal expansion chamber
16.Valve plate of thermal
17.Compression chamber
18.Valve plate of compressionChamber
11.Movable arc contact
12.Arc-extinguishing spout
13.Static arc contact
14.Static main contact
15.Thermal expansion chamber
16.Valve plate of thermal
17.Compression chamber
18.Valve plate of compressionChamber
Drawing 4
Frequently Asked Questions (FAQ)
What is the primary application of the LW39-126 circuit breaker?
It is designed for outdoor AC high voltage systems with a 50/60Hz frequency and a 110kV normal system voltage, mainly serving control and protection functions in power plants and substations.
What operating mechanism does this circuit breaker use?
The LW39-126 circuit breaker is equipped with a CT30 type spring operating mechanism, which supports three-phase mechanical linkage operation.
How does the arc-extinguishing system work?
It utilizes thermal expansion self-arc-extinguishment and is filled with high-performance SF6 gas for superior arc-extinguishing and electrical insulation. Double-circle O-ring seals prevent gas leakage.
What are the environmental limits for installing the LW39-126?
It operates in altitudes up to 3000 meters, ambient temperatures from -35℃ to +40℃, wind speeds up to 35m/s, and relative humidity averages up to 95% daily.
What is the mechanical lifespan of this circuit breaker?
The LW39-126 circuit breaker has a mechanical life rating of 10,000 operations and features a long overhaul period with minimal maintenance requirements.
Which quality standard does the circuit breaker conform to?
The circuit breaker is designed and tested in compliance with the GB1984 standards.