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

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

High voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO Electric
High voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO ElectricHigh voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO ElectricHigh voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO ElectricHigh voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO ElectricHigh voltage AC SF6 circuit breaker LW□-252KV 4000A 50KA from JUCRO Electric
CategoriesSF6 Circuit Breaker
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BrandJUCRO
ModelLW□-252KV 4000A 50KA
Update Time2019-01-20
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
Between interrupter
KV
460+146
3
Rated thunder impulse withstand voltage
To earth
KV
1050
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
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
DC220VAC220V
2
The voltage/current of the opening and closing coils
V/A
DC110/4;Dc220/2.5
3
Energy storage motor
Rated voltage
V
DC220VAC220V
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
DC220VAC220V
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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