Overview
The LW36-126T high-voltage AC SF6 tank circuit breaker integrates the circuit breaker and current transformer, and the arc extinguishing chamber is installed horizontally in a grounded aluminum alloy shell. It is equipped with a CT26 spring operating mechanism. It has few parts, simple and compact layout, strong and durable overall, meets the oil-free requirements of the switch, has excellent mechanical properties and high reliability. The important parts are processed by CNC and machining center equipment, and the mechanical life can reach 10,000 times. It is suitable for three-phase AC 50Hz outdoor high-voltage switch equipment. It can be used for the control and protection of 72.5 (126) KV power transmission and transformation systems; it can also be used for contact breaking and opening and closing capacitor banks.
Model meaning
Structural features
1. The circuit breaker adopts a three-phase porcelain column single-break structure. The three phases are equipped with a spring operating mechanism. They are arranged in the center and the three phases are linked, so the appearance is novel and exquisite. The circuit breaker uses SF6 gas as the insulation and arc extinguishing medium. During operation, the three poles of the circuit breaker are connected with SF6 gas, and a pointer density relay is used to monitor its pressure and density. Due to the adoption of the self-energy arc extinguishing principle and the optimized design in the circuit breaker motion system, the mechanical efficiency is effectively improved and the operating work is minimized.
2. Excellent breaking performance and long electrical life.
3. The installation base frame and support are made of integrally bent steel plates. The surface treatment is all hot-dip galvanized. All exposed fasteners are made of high-strength materials and hot-dip galvanized or stainless steel standard parts. The outer shell of the mechanism box is made of stainless steel. The product has excellent corrosion resistance.
4. The machine has high reliability and can be operated frequently.
5. Due to the inherently high dielectric strength of sulfur hexafluoride gas and the circuit breaker using superior contact movement, the circuit breaker breaks capacitive current without reignition.
6. The external insulation level is high, the external insulation is designed with a large creepage distance, the specific creepage distance is >31mm/V, and it has excellent pollution resistance. It can also operate safely in harsh environments.
7. Strong current carrying capacity: The temperature rise test is performed at 1.2 times the rated current of 3150A, that is, 3780A, and there is still a large margin for temperature rise at each point.
8. The overall appearance and structure of the product are compact, easy to install and debug on site, and require little maintenance work.
Mechanical adjustment parameters of the product
|
Project |
Unit |
Value |
|
Center distance between poles of circuit breaker |
mm |
1750 |
|
Moving contact stroke |
mm |
120 |
|
Moving contact contact stroke |
mm |
25 |
|
Circuit breaker phase operating link stroke (chord length) |
mm |
110 |
|
Opening speed |
m/s |
4.2-5m/s |
|
Closing speed |
m/s |
2.2-3m/s |
|
Gate opening time |
ms |
≤40 |
|
Closing time |
ms |
≤100 |
|
Breaking time |
ms |
≤60 |
|
Closing and opening time |
ms |
≤80 |
|
Opening and closing time |
ms |
300 |
|
Different phases of three-phase opening |
ms |
≤2 |
|
Different phases of three-phase closing |
ms |
≤3 |
Main parameters of operating mechanism
|
Project |
Unit |
Value |
|
|
Auxiliary circuit voltage |
V |
DC220DC110 |
|
|
Opening and closing coil voltage/current |
V/A |
DC110/4;DC220/2 |
|
|
Energy storage motor |
Rated voltage |
V |
DC220/AC220/DC1110/AC110 |
|
Normal operating voltage range |
V |
85%~110% |
|
|
power |
W |
600 |
|
|
Motor energy storage time |
S |
≤15 |
|
|
Heater and lighting circuit voltage |
V |
AC220V |
|
|
Auxiliary switch rated voltage |
V |
DC220V,AC220V |
|
|
Auxiliary switch rated current |
A |
10 |
|
|
Number of auxiliary switch contacts |
10 normally open + 10 normally closed |
||
Circuit breaker technical parameters
|
Project |
Unit |
Value |
|
|
Rated voltage |
KV |
126 |
|
|
1min rated power frequency withstand voltage |
To the ground |
KV |
K·230 |
|
between fractures |
K·265 |
||
|
Rated lightning impulse withstand voltage |
To the ground |
K·550 |
|
|
between fractures |
K·630 |
||
|
Power frequency withstand voltage of SF6 gas at zero gauge pressure (5min) |
K·95 |
||
|
Rated frequency |
Hz |
50 |
|
|
Rated current |
A |
3150 |
|
|
First open pole coefficient |
1.5 |
||
|
Rated short circuit breaking current |
40 |
||
|
Rated short circuit making current (peak value) |
KA |
100 |
|
|
Rated short circuit withstand current |
40 |
||
|
Rated peak withstand current |
100 |
||
|
Rated short circuit duration |
S |
4 |
|
|
Rated out-of-step breaking current |
KA |
10 |
|
|
Near zone fault interrupting current |
KA |
90%lk,75%lk |
|
|
Rated line charging switching current |
A |
31.5 |
|
|
Rated operating sequence |
O-0.3S-CO-180S-CO |
||
|
Rated sulfur hexafluoride gas pressure (20℃ gauge pressure) |
MPa |
0.5 |
|
|
Alarm/minimum functional pressure (20°C gauge pressure) |
MPa |
0.45±0.03 |
|
|
SF6 gas annual leakage rate |
＜0.5% |
||
|
Gas moisture content (V/V) |
≤150×10-6 |
||
|
Mechanical life |
times |
10000 |
|
|
radio frequency interference |
μV |
≤500 |
|
|
Creepage distance |
between fractures |
mm |
3906/3150 |
|
To the ground |
3906/3150 |
||
|
The weight of SF6 gas charged into each unit |
Kg |
15 |
|
|
Weight of each circuit breaker |
Kg |
2200 |
|
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