Outdoor High Voltage AC SF6 Circuit Breaker

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Product Description

LWD-252/4000-50 Outdoor high voltage AC SF6 circuit breaker is an outdoor product, suitable for AC 50Hz, maximum voltage 252kV power grids with an altitude of no more than 2000 meters, an ambient temperature of no less than -30°C, and a pollution level of no more than IV. It is used to cut off the rated current, fault current or conversion line to achieve control and protection of the power system. It can also be used as a connecting circuit breaker.

This product uses SF6 gas as arc extinguishing and insulation medium, adopts the most advanced international self-energy arc extinguishing technology, and is equipped with a new spring operating mechanism. It has the characteristics of long electrical life, low operating power, low noise, and high reliability. It has a simple structure, small size, and a long maintenance cycle. In the current process of power equipment tending to be oil-free and large-capacity, it can completely replace imported products of the same type.

Structural characteristics

The outdoor high voltage AC SF6 circuit breaker adopts a three-phase porcelain column single-break structure, each phase is equipped with a spring operating mechanism, and the three phases are electrically linked, so the appearance is novel and exquisite. The circuit breaker uses SF6 gas as the insulation and arc extinguishing medium, and uses a pointer-type density relay to monitor its pressure and density progress. Due to the self-energy arc extinguishing principle, once the circuit breaker movement system is optimized, the mechanical efficiency is effectively improved and the operating work is minimized.

Excellent breaking performance and long electrical life.

Each pole of the outdoor high voltage AC SF6 circuit breaker is installed on a mechanism box, which is centrally installed on the foot. There are spring operating mechanisms and electrical control units in the box. The output rod of the mechanism is connected to the crank arm. The surface of the mechanism box bracket adopts hot-dip galvanizing process, the fasteners are hot-dip galvanized, and the casing of the mechanism box is made of stainless steel. Therefore, the product has excellent corrosion resistance. High mechanical reliability and can be operated frequently.

Due to the inherent high insulation strength of sulfur hexafluoride gas and the optimal contact movement of the circuit breaker, the circuit breaker breaks capacitive current without reignition.

The external insulation level is high, the external insulation is designed with a large creepage distance, and the pollution resistance is excellent.

Strong current carrying capacity: the temperature rise test is carried out at 1.2 times the rated current of 4000A, and there is still a large margin for the temperature rise at each point.

The overall appearance and structure of the product are compact, the on-site installation and debugging are convenient, and the maintenance workload is small.

Outdoor high voltage AC SF6 circuit breaker Technical Parameters

NO.	Name		Unit V Auxiliary circuit voltage	Parameters
1	Auxiliary circuit voltage		Unit V Auxiliary circuit voltage	DC220V. AC220V
2	Opening and closing coil voltage/current	Opening and closing coil voltage/current	V/A	DC110/4;DC220/2.5
3	Energy storage motor	Rated voltage	V	DC220V、AC220V
		Normal operating voltage range	V	85%-110%
		Power	W	600
4	Energy storage time of the motor		S	W15
5	Voltage of heater and lighting circuit		V	AC220V
6	Rated voltage of auxiliary switch		V	DC220V、AC220V
7	Rated current of auxiliary switch		A	10
8	Number of contacts of auxiliary switch			10 normally open + 10 normally closed

Outdoor high voltage AC SF6 circuit breaker Main technical parameters

No.	Name	UNIT	Parameters
1	Circuit breaker pole center distance	mm	3000-4000
2	Moving contact stroke	mm	160±3
3	Moving contact contact stroke	mm	50 ±2
4	Opening time	mm	30 ±5
5	Closing time	m/s	90±15
6	Breaking time	m/s	名60
7	Closing-opening time	ms	名80
8	Closing-closing time	ms	300
9	Three-phase opening phase difference	ms	w3
10	Three-phase closing phase difference	ms	w5
11	Rated voltage	252
12	Rated power frequency withstand voltage (1min) Rated lightning impulse withstand voltage	To ground		460
12		Between breaks	kV	460+146
13	Rated frequency Rated current	To ground		1050
13	Rated frequency Rated current	Between breaks		1050+206
14	First opening coefficient		Hz	50
15	Rated short-circuit breaking current		A	4000
16	Rated short-circuit closing current (peak value)			1.3
17	Rated short-circuit withstand current		kA	50
18	Rated peak withstand current		kA	125
19	Rated short-circuit duration		kA	50
20	Rated out-of-step breaking current		kA	125
21	Near-zone fault breaking current		S	3
22	Rated line charging breaking current		kA	12.5
23	Rated operation sequence		kA	90%lk,75%lk
24	Main circuit resistance		A	200
25	Rated sulfur hexaoxide gas pressure (20°C gauge pressure)			O-0.3s-CO180s-CO
26	Alarm/minimum functional pressure (20°C gauge pressure)		M Q	w55
27	Sf6 gas annual leakage rate		Mpa	0.6
28	Gas moisture content (V/V)		Mpa	0.55±0.015/0.50±0.015
29	Mechanical life			w 0.5%
30	Radio interference level		ppm	w150
31	Creep distance		次	10000
32	Rated voltage		mV	<500
33	Rated power frequency withstand voltage (1min)	Between the fractures and the ground		N 8660
33	Rated power frequency withstand voltage (1min)	Between the fractures and the ground		2 6900
24	Weight of each SF6 gas filled unit		kg	24
25	Weight of each circuit breaker		kg	1500

1. Weight M: 4500kg (with gas); total gas weight: 24kg.

2. Basic load: static 4500kg (three poles); 1500kg (per pole); dynamic horizontal direction F: 2500kg; vertical direction (upward) 3500kg; vertical direction (downward) 6000kgo

3. The levelness of the concrete surface is not more than 1.5mm.

4. The installation hole for connecting the terminal to the primary line is drilled on site according to the needs of the user. The material of the terminal is aluminum alloy 2A12-T4O

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Related Category

Sulfur Hexafluoride Series

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Contact Info

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Address

No. 196-16, Wei 12th Road, Leqing Economic Development Zone, Leqing County, Wenzhou City, Zhejiang Province, China
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Tel

+86-19139518311
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E-mail

19139518311@163.com

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