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Home > Products > MV,HV Electrical Components > Circuit Breaker > 145kV 132kV 126kV High voltage breaker 3 pole Outdoor electric breaker pole mounted sf6 circuit breaker

145kV 132kV 126kV High voltage breaker 3 pole Outdoor electric breaker pole mounted sf6 circuit breaker

Product Description

Product Description Product Overview Overview
Type LWA-126/T3150-40 High Voltage SF6 circuit breaker for outdoor use adopts SF6 as insulation and arc extinguishing medium. It can make, carry and break the normal circuit current in high voltage transmission lines; it also can operate short current or overload current of Switchgear. Its structure use porcelain type, can be operated like three-phase opening, closing and auto-reclosing, protect and control transmission lines in 50Hz, 126kV circuit.
The Circuit Breaker adopts self-extinguish principle, equipped with spring mechanism. When the circuit breaker got a opening order, the rigid parts consisted of cylinder, movable arc contacts, rod move downwards under the opening spring force. During movement, main fixed contacts leave the movable main contacts, the current moves to arc contacts, then the arc contacts depart, the arc appears between the fixed contacts and movable contacts. When it breaks short current, high capacity current leads to great energy between arc contacts, hot gas flow inrushes thermal expansion chamber and exchange thermal energy there, then the gas become low temperature and high pressure. Now, because the pressure of thermal expansion chamber is greater then auxiliary gas chamber, so the check valve of interrupter is closed. When the current value is zero, the high pressure gas of thermal expansion chamber blow to the gap contrarily, so the arc extinguished. When it breaks low current( less than several thousand amperes), due to low energy, the rising speed of gas pressure in expansion chamber is slower than auxiliary chamber, the check valve is open, the compress gas blow to the expansion chamber, the gas flow occur, then the arc extinguished when the current value is zero.
Standards:GB1984,GB/T11022,GB3309,GB8905,GB11023 ,GB12022,DL/T402,JB/T9694,IEC62271-100 Main features⚫Adopt self-extinguish principle, small operating energy, light mechanical impact;
⚫Use spring mechanism, its performance is not relevant to temperature, stable performance;
⚫Optimized interrupter structure and movement curve of contact, high reliability on breaking current;
⚫Reignite and restrike cannot occur under breaking capacitive current;
⚫Optimized pole and frame design with higher capability to endure earthquake;
⚫High reliability, long average normal service time, low maintenance cost;
⚫Convenient installation and configuration in field, it takes only one day or two days;
⚫Low operating noise, suit for residential area.:Environmental conditions
Installation site
outdoor
Ambient temperature
-25℃~+40℃
Max. daily temperature difference
≤25℃
Height above sea level
2000m(no limit for specified order)
Air humidity
Daily average:≤95%;
month average:≤90%;
Wind speed
≤34m/s
Solar radiation
≤0.1W/cm2(fine day, noon)
Earthquake intensity
horizontal:≤0.3g;vertical:≤0.15g
Icing thickness
≤10mm
Creepage distance
25mm/kV or 31mm/kV
Static load on terminal in Y-direction
1250N
Static load on terminal in X-direction
750N
Static load on terminal in Z-direction
1000N
Main Technical data
No.
                                               Items
       Unit
        Parameter
1
Rated voltage
kV
126
2
Rated power frequency withstand voltage(1min)
Phase-to-phase
Phase-to-ground
kV
230
fracture
kV
230+73*
3
Rated lightning impulse withstand voltage
Phase-to-phase
Phase-to-ground
kV
550
fracture
kV
550+103*
4
Power frequency withstand voltage(5min)under SF6 zero-gauge pressure
kV
95
5
Rated frequency
Hz
50
6
Rated current
A
3150
7
Rated short circuit breaking current
kA
40
8
First-pole-to-clear factor

1.5
9
Rated short circuit breaking current
(DC component)

More than 41%
10
Rated short circuit making current (peak)
kA
100
11
Rated short time withstand current(rms)
kA
40
12
Rated peak withstand current
kA
100
13
Rated short circuit duration
s
4
14
Rated out-of-phase breaking current
kA
3(OP1) ,10(OP2)
15
Short range breaking current
kA
36;30
16
Wrong-phase earthing fault
breaking current
kA
34.8
17
Rated line charging switching current
A
31.5
18
Full capacity breaking time without check and repair
Times
20 or rated current breaking times:3000
19
Rated operating sequence

O-0.3s-CO-180s-CO
20
Rated SF6 pressure (20℃ gauge)
MPa
0.6
21
alarm/Lock pressure(20℃ gauge)
MPa
0.55/0.50
22
SF6 annual leakage rate
%/Y
≯0.5
23
Gas moisture content
Check value
after hand over
μL/L
≯150
Allowed service
value
μL/L
≯300
24
Resistance of the main circuit
μΩ
≤35
25
Mechanical life
Time
6000
26
Radio interference level (1.1Ur/)
μV
≯500
27
Allowed partial discharge intensity(1.2Ur)
pC
≤5
28
Noise(distance from sound source:horizontality:2m、height:1.5m)
dB
90

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