Dead Tank SF6 Circuit Breaker
Description
The dead tank SF6 circuit breakers are all equipped with pure spring operating mechanisms which makes structure simple and highly reliable. The mechanical endurance for the operating mechanism is over 10000 times, and it is convenient for maintenance and meets mechanism’s requirements for oil free and air free. It uses self-energy arc-extinguishing principle, and reduces operation power of the mechanism and enhance operational reliability of product.
The flanges adopt dual-seal structural design, the outer seal ring is water-proof and inner seal ring is gas - proof. Therefore, it can reduce the leakage of the product greatly and makes the product more suitable for outdoor operation.
Service environment
? Ambient temperature: -40 ℃ ~ +55 ℃.
? Daily average ambient air relative humidity ≤ 95%, on average ≤ 90%;
? Wind pressure: less than 700pa.
? Altitude: less than 3000m.
? Earthquake intensity: not more than 9 degrees.
? Air Contamination: Ⅲ grade.
Principle
1. High breaking current: Self-energy principle: The arc combustion makes SF6 gas in the thermal expansion chamber fiercely expanding to generate gas flow blowing to nozzle to the nozzle to extinguish the arc.
2. Low breaking current: Puff type principle: SF6 gas in the compression chamber is compressed to generate gas flow, blowing to the nozzle to extinguish the arc, which then extinguishes.
Field service operation and warranty issues
ROCKWILL can provide competent, well trained field service representatives to provide technical guidance and advisory assistance for the installation, overhaul, repair and maintenance of ROCKWILL? equipment, processes and systems.
Technical data
|
No. |
Description |
Technical parameters |
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|
1 |
Rated voltage, kV |
72.5 |
123 |
145 |
245 |
|
2 |
Rated frequency, Hz |
50/60 |
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|
3 |
Rated current, A |
1600~4000 |
3150~4000 |
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|
4 |
1min Power frequency withstand voltage |
140 |
185/230 |
230/275 |
360/395/460 |
|
5 |
Lightning impulse withstand voltage |
325 |
450/550 |
550/650 |
850/950/1050 |
|
6 |
Rated short-circuit breaking current, kA |
25~40 |
40~63 |
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|
7 |
Rated short circuit breaking current (peak), kA |
63~100 |
100~157.5 |
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|
8 |
Rated short duration, s |
3 |
3 |
3 |
3 |
|
9 |
Rated out-of-phase breaking current |
10 |
10 |
10 |
10 |
|
10 |
Rated cable(line) charging breaking current |
10 |
31.5 |
50 |
125 |
|
11 |
Rated gas pressure, Mpa |
0.4 |
0.5 |
0.58 |
0.62 |
|
12 |
Operation sequence |
O-0.3s-CO-180s-CO |
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|
13 |
Partial Discharge |
10 pC |
10 pC |
10 pC |
5 pC |
|
14 |
SF6 gas leakage rate (per year) |
≤1% |
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|
15 |
First open pole factor |
1.5 |
1.55 |
1.5 |
1.3 |
|
16 |
Main loop resistance, μΩ |
≤40 |
≤45 |
≤45 |
≤50 |
|
17 |
Heater voltage |
AC220 |
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|
18 |
Control circuit and signal circuit voltage |
DC110, DC220, DC230 |
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|
19 |
Motor voltage |
DC110, DC220, DC230 |
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Note: For short circuit breaking current & rated current is optional by clients.
Structure
LW Series self-energy sulfur hexafluoride circuit breaker uses the principle of self-interrupter, greatly reducing the pressure cylinder diameter and weight, reduced operating power, making equipped with spring operating mechanism to become a reality.
Three single pole circuit breaker and each of the three mounted on the spring mechanism consisting of three stents, can be either unipolar operation, and can achieve three-pole electrical linkage. Spring mechanism mounted on the side of the bracket, electrical control system is placed inside the body. The upper part of the body is a single-pole circuit breaker interrupter single fracture, the middle pillar porcelain sets, the lower part is used for sealing, opening spring and buffer.
The circuit breaker works with the current mature self-energy technology principle. The energy required to break the short-circuit current, in part from the arc itself, reduces the energy of the operating mechanism. The circuit breaker transmission mode is three-phase mechanical linkage, which can effectively ensure the three- phase switching and synchronizing.
Opening position
Closing position