High Voltage SF6 Indoor Circuit Breaker Vacuum Circuit Breaker

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

Contact us if you need more details on Sf6 Indoor Circuit Breaker. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Vacuum Circuit Breaker、Indoor Circuit Breaker. If these products fail to match your need, please contact us and we would like to provide relevant information.

Product Categories : MV,HV Electrical Components > Circuit Breaker