0102030405
China LW39-126 Outdoor AC High Voltage SF6 Circuit Breaker - Reliable Suppliers and Factory Solutions
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.
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 | SF6 gas pressure(20℃) | 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
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
Drawing 3
Drawing 4
- 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 compression Chamber
Frequently Asked Questions (FAQ)
What is the application and system voltage of the LW39-126 circuit breaker?
The LW39-126 type outdoor AC high voltage porcelain SF6 circuit breaker is designed for power systems operating at 50/60Hz frequency with a 110kV normal system voltage. It serves as the primary power equipment in power plants and substations for control and protection.
What type of operating mechanism does this circuit breaker use?
It is equipped with a CT30 type spring operating mechanism, which supports three-phase mechanical linkage operation for a simple, reliable, and compact structure.
What are the environmental limits for installing the LW39-126 circuit breaker?
It is designed to operate at altitudes up to 3000m, ambient temperatures between -35℃ and +40℃, wind speeds up to 35m/s, daily temperature differences under 25℃, and earthquake levels up to 9°.
How does the arc-extinguishing system prevent SF6 gas leakage?
The circuit breaker features a thermal expansion self-arc-extinguish design. To prevent leakages, all sealing interfaces are fitted with double-circle O-type seal rings, keeping the yearly leak rate under 1%.
What is the rated mechanical life and maintenance requirement?
The LW39-126 has a rated mechanical life of 10,000 operations. It offers 20 times breaking capacity under full short-circuit load and is completely maintenance-free under normal operation over many years.