High voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO Electric

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High voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO Electric

Categories	SF6 Circuit Breaker
Brand	JUCRO
Model	LW□-252/4000-50
Update Time	2021-10-23

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Detail Information

Outdoor high voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO Electric

Meaning of type

Introduction

The LW□-252/4000-50 self-extinction Ac circuit breaker which is outdoor type finds its universal range of applications for the electrical system with elevation not greater than 2000m, ambient temperature not lower than-30C, dirtiness grade not higher than IV, alternating current 50Hz and the maximum voltage 126kV. It is used for cutting the rated current, malfunction current or switching the circuitry, to control and protect the electrical system, and it can also be used for connecting with the circuit breaker

The gas of the SF6 is employed as the arc-extinguishing medium and the dielectric material. The self-extinction technology and the new-type spring operating mechanism are introduced in the SF6 circuit breaker. Thus the circuit breaker has good qualities with long electrical life, low operation power, lower noise, high reliability, simple structure, small and long overhaul periods. It can fully replace the import same type one.

Caracteristic of structure

The breaker introduces the three-phase porcelain -pole with single interrupter structure. A spring operating mechanism is supplied and the mechanical action of the three-phase is inner connected. The gas of the SF6 is connected in the three-phase pole parts. A density controller with temperature compensation is used to monitor the gas of the SF6. Because of the self-extinction arc control principle and optimized design, it improves the efficiency of mechanism and reduces the operating power

Excellent breaking performance and long electrical life

High mechanism reliability and can be operated frequently

Because of the high insulation intensity and excellent contact movement, the breaking capacity current will not re-burn

The circuit breaker has high outer insulation level and ratio creepage distance is greater than. So it has excellent performance of resisting the filth and the earthquake, it is also can be operated safely under the environment with atrocious weather

High carrying ability: it has high capability margin as the temperature of each contact rises when it is under temperature rise test in the circuit (1.2 times 0f 4000A)

The appearance of the breaker is compact, and the installation and debugging is very easy. The maintenance is also very convenient.

Main technical data of breaker

No	Name		Unit	Value
1	Rated voltage		KV	252
2	Rated power frequency withstand voltage(1 min)	To earth	KV	460
2	Rated power frequency withstand voltage(1 min)	Between interrupter	KV	460+146
3	Rated thunder impulse withstand voltage	To earth	KV	1050
3	Rated thunder impulse withstand voltage	Between interrupter	KV	1050+206
4	Rated frequency		HZ	50
5	Rated current		A	4000
6	Amplitude factor			1.3
7	Rated short-circuit breaking current		KA	50
8	Rated short-circuit making current(peak)		KA	125
9	Rated short-circuit withstand current		KA	50
10	Rated peak value withstand current		KA	125
11	Rated short-circuit duration		s	3
12	Rated out-of-phase breaking current		KA	12.5
13	Breaking current of close-in fault		KA	90%lk,75%lk
14	Rated line-charging breaking current		A	200
15	Operating sequence			0-0.3s-CO-180s-CO
16	Resistance of the main circuit		µΩ	≤55
17	Rated gauge pressure of SF6(20℃)		Mpa	0.6
18	Minimum functional gauge pressure(20℃)		Mpa	0.55±0.015/0.50±0.015
19	Annual leakage rate of SF6			≤0.5%
20	Amount of water of SF6(V/V)		ppm	≤150
21	Mechanical life		times	10000
22	Electrical level of radio interference		µ V	<500
23	Creepage distance	Between interrupter	mm	≥8660
23	Creepage distance	To earth	mm	≥6900
24	Each filled with SF6 gas weight		kg	25
25	Weight per breaker		kg	1500

Main technical data of structure

No	Name		Unit	Value
1	Auxiliary circuit voltage		V	DC220V、AC220V
2	The voltage/current of the opening and closing coils		V/A	DC110/4;Dc220/2.5
3	Energy storage motor	Rated voltage	V	DC220V、AC220V
		The range of normal working voltage	V	5%-110%
		Power	W	600
4	The energy storage time of motor		s	≤15
5	The loop voltage of the heater and the lamp		V	AC220V
6	Rated voltage of the auxiliary switch		V	DC220V、AC220V
7	Rated current of the auxiliary switch		A	10
8	Contacts of the auxiliary switches			10 normal opened contacts and 10 normal closed contacts

Mechnical adjustment of the breaker

No	Name	Unit	Value
1	Center distance between poles	mm	3000-4000
2	Strode length of the moving	mm	160±3
3	Contact stroke length of the moving contact	mm	50±2
4	Switch- off time	m/s	30±5
5	Switch- on time	m/s	90±15
6	Break time	ms	≤60
7	Switch-on/off time	ms	≤80
8	Switch- off/on time	ms	300
9	The time difference of the opening of three phases	ms	≤3
10	The time difference of the closing of three phases	ms	≤5

Order notice

The type and the specification of the circuit breaker.

Rated electric parameter(voltage, current, rated short-circuit breaking current and so on)

Environmental condition(temperature, altitude, filth level and so on)

Rated electric parameter of control loop(rated voltage of energy storage motor, rated voltage of the opening and closing coils).

The name and the number of the accessories when required.

The connection of the primary upper terminal.

1. Weight: 4500kg( with gas)

Total weight of gas: 24kg

2. Foundation load: static state 4500kg(three level)

1500kg(each pole)

Dynamic horizontal direction F: 2500kg

Vertical direction(upward): 3500kg;

Vertical direction(downward): 6000kg

3. Level degree of concrete surface not exceeds 1.5mm

4. Mounting hole for connection of terminal block and primary line, users shall drill as required on site

Material of terminal block: aluminum alloy 2A12-T4

Packing & Delivery

Strong package, Safety first.

Inside with foam to support the product, put it in carton or wooden box, fixed it on pallet.

As long as possible to keep the products safe until it arriving customer's warehouse.

Clearly marking label outside of package, customers will be easy to identify their goods.

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