1.1 The main purpose and scope of application
LW36-126/3150-40 high voltage SF6 circuit breaker (equipped with CTB type spring operating mechanism) is an outdoor AC three-phase 50Hz high-voltage power transmission and transformation equipment, used to open and close rated current, fault current or change the line to realize the protection, control and operation of the power transmission and transformation system, and can perform three-phase opening fast and automatic reclosing operation.
The circuit breaker has the latest design principles, simple structure, small size, less consumables; Low energy operation, high reliability, easy installation and low noise.
1.2 Environmental conditions
Environment temperature: -30℃～＋40℃
Wind pressure is not more than 700Pa
Altitude not greater than 2000m
Earthquake intensity is not more than 9 degrees
The degree of air pollution is not greater than Grade IV
1.3 Rated parameters
1.3.1 The rated parameters of the circuit breaker and operating mechanism are shown in Table 1
|
No. |
Name |
Unit |
Value |
|
|
1 |
Rated voltage |
kV |
126 |
|
|
2 |
Rated insulation level |
kV |
Table 2 |
|
|
3 |
Rated frequency |
Hz |
50 |
|
|
4 |
Rated current |
A |
3150 |
|
|
5 |
Rated short circuit breaking current |
kA |
40 |
|
|
6 |
Rated peak withstand current |
kA |
100 |
|
|
7 |
Rated short circuit duration |
s |
4 |
|
|
8 |
Rated short circuit closing current(peak) |
kA |
100 |
|
|
9 |
Short-line fault breaking current |
kA |
L90:36, L75:30 |
|
|
10 |
Rated line charging breaking current |
A |
31.5 |
|
|
11 |
Rated out-of-phase breaking current |
kA |
10 |
|
|
12 |
Out-of-phase ground fault breaking current |
kA |
34.8 |
|
|
13 |
Cumulative breaking times under rated short-circuit breaking current |
times |
20 |
|
|
14 |
First pole factor |
1.5(cover 1.3) |
||
|
15 |
SF6 gas pressure (20℃) |
MPa |
Table 3 |
|
|
16 |
Main mechanical characteristics |
Table 4 |
||
|
17 |
Rated operating sequence |
O-0.3s-CO-180s-CO |
||
|
18 |
Main circuit resistance |
μΩ |
≤45 |
|
|
19 |
Terminal static load |
Horizontal and vertical Ftha |
N |
1250 |
|
Horizontal Fthb |
N |
750 |
||
|
Vertical direction Ftv |
N |
1000 |
||
|
Force generated by wind pressure Fwh |
N |
500 |
||
|
20 |
Mechanical life |
times |
6000 |
|
|
21 |
SF6 gas annual leakage rate |
≤1% |
||
|
22 |
SF6 gas moisture content (V/V) |
ppm |
≤150 |
|
|
23 |
Rated voltage of control circuit and auxiliary circuit power supply |
V |
Table 5 |
|
|
24 |
Total weight of circuit breaker (including mechanism) |
kg |
1700 |
|
|
25 |
Total weight of SF6 gas |
kg |
6 |
|
|
26 |
Outline dimensions of the circuit breaker |
mm |
4000*560*4942 |
|
Table 2 Rated insulation level (kV)
|
No. |
Name |
Main value |
|
|
1 |
Power frequency withstand voltage/min (effective value, dry test, wet test) |
Between gaps |
265/300 |
|
Between phases or phase to ground |
230/260 |
||
|
2 |
Lightning impulse withstand voltage (Full wave 1.2/50Μs) (peak value) |
Between gaps |
630/712 |
|
Between phases or phase to ground |
550/622 |
||
|
3 |
When SF6 gas has zero gauge pressure, 5min power frequency withstand voltage (effective value) |
Between gaps |
95 |
|
Phase to ground |
95 |
||
|
Note: The parameter in NO. 1 and NO. 2 is the insulation level at an altitude of 2000m. |
|||
Table 3 SF6 gas pressure (20℃)
|
NO. |
Name |
SF6 gas parameters |
|
1 |
Rated working pressure PN |
0.50±0.015 |
|
2 |
Air supply alarm pressure P1A |
0.45±0.015 |
|
3 |
Circuit breaker locking pressure P2A |
0.40±0.015 |
|
4 |
Pressure difference between P1A and P2A |
0.048±0.052 |
|
5 |
Replenish gas alarm and relieve pressure P1B |
0.48±0.015 |
|
6 |
Circuit breaker locking relieve pressure P2B |
0.43±0.015 |
|
7 |
Inflation pressure during product packaging and transportation P3 |
0.025 |
Table 4 Main mechanical characteristics
|
NO. |
Name |
Unit |
Value |
|
1 |
Moving contact stroke |
mm |
148±4 |
|
2 |
Contact stroke of moving contact |
mm |
25±2 |
|
3 |
Contact clearance |
mm |
120±2 |
|
4 |
Opening time |
ms |
28±5 |
|
5 |
Closing time |
ms |
≤110 |
|
6 |
O-C time |
ms |
Factory value ≤300, operating value≥300 |
|
7 |
C-O time |
ms |
Factory value ≤60, operating value≥60 |
|
8 |
Opening simultaneity |
ms |
≤3 |
|
9 |
Closing simultaneity |
ms |
≤5 |
|
10 |
Breaking time |
ms |
≤60 |
|
11 |
Opening speed |
M/s |
4.8±0.5 |
|
12 |
Closing speed |
M/s |
2.8±0.5 |
Table 5 Rated voltage of control circuit and auxiliary circuit power supply
|
NO. |
Name |
Unit |
Value |
|
1 |
Control and signal circuit voltage |
V |
DC220/DC110 |
|
2 |
Motor voltage/power frequency |
V/W |
DC/AC 220/650 |
|
3 |
Moisture heating circuit voltage |
V |
AC220 |
|
4 |
Rated current of closing coil |
A |
2/3.67 |
|
5 |
Rated current of opening coil |
A |
2.3/3.67 |
