LW-252KV SF6 circuit breaker from JUCRO Electric (China Manufacturer) - Other Electrical & Electronic

LW-252KV SF6 circuit breaker from JUCRO Electric

Model:	-
Brand:	-
Origin:	Made In China
Category:	Electronics & Electricity / Other Electrical & Electronic
Label:	-
Price:	US $22120 / pc
Min. Order:	1 pc

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Product Description

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 deb ing is very easy. The maintenance is also very convenient

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		460+146
3.	Rated thunder impulse withstand voltage	To earth		1050
3.	Rated thunder impulse withstand voltage	Between interrupter		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
24.	Creepage distance	To earth		≥6900
25.	Each filled with SF6 gas weight		kg	25
26.	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