LW□-252/3150-40
This 252kV SF6 circuit breaker supports both single-pole and three-pole linkage operation, adapting to different power system control strategies. It is equipped with a reliable operating mechanism, featuring flexible opening and closing actions, low mechanical failure rate and long mechanical service life. The optimized fully sealed gas chamber structure greatly reduces SF6 gas consumption and annual leakage rate, realizing maintenance-free operation for a long period.
Available in mainstream specifications of 3150A, 4000A rated current and 40kA, 50kA short-circuit breaking capacity, the LW□-252 circuit breaker fully complies with IEC and international power industry standards. It is widely used in national power grids, large industrial substations, new energy power stations and long-distance power transmission projects, undertaking circuit switching, overload protection and short-circuit fault isolation core functions.
With the advantages of compact and reasonable structure, excellent environmental adaptability, stable high-voltage operation performance and low comprehensive operation cost, the LW□-252 outdoor SF6 circuit breaker is the core preferred switch equipment for 220kV high-voltage power transmission and transformation engineering.
Product Details
LW□-252
Outdoor high voltage AC SF6 circuit breaker
□ 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-30℃,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.
□ Characteristic 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(1.2times of4000A).
□The appearance of the breaker is compact,and the installation and debugging is very easy.The maintenance is also very convenient.
□Technical data
1)Main technical data of breaker
|
No. |
N a m e |
Unit |
Value |
||
|
1 |
Rated voltage |
|
252 |
||
|
2 |
Rated power frequency withstand voltage(1min) |
To earth |
kV |
460 |
|
|
Between interrupter |
460+146 |
||||
|
3 |
Rated thunder impulse withstand voltage |
To earth |
1050 |
||
|
Between interrupter |
1050+206 |
||||
|
4 |
Rated frequency |
Hz |
50 |
||
|
5 |
Rated current |
A |
4000 |
||
|
6 |
Amplitude factor |
|
1.3 |
||
|
7 |
Rated shor-circuit breaking current |
kA |
50 |
||
|
8 |
Rated short-circuit making current(peak) |
kA |
125 |
||
|
9 |
Rated short-circuit with stand current |
kA |
50 |
||
|
10 |
Rated peak value withstand current |
125 |
|||
|
11 |
Rated short-circuit duration |
s |
3 |
||
|
12 |
Rated out-of-phase breaking current |
kA |
12.5 |
||
|
1.3 |
Breaking current of close-in fault |
kA |
90%lk,75%lk |
||
|
14 |
Rated line-charging breaking current |
A |
200 |
||
|
15 |
Operating sequence |
|
O-0.3s-CO-180s-cO |
||
|
16 |
Resistance ofthe 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 ofSF6(V/V) |
ppm |
≤150 |
||
|
21 |
Mechanical life |
次 |
10000 |
||
|
22 |
Electrical level of radio interference |
μV |
<500 |
||
|
23 |
Creepage distance |
Between interrupter |
mm |
≥8660 |
|
|
To earth |
≥6900 |
||||
|
24 |
Eachfilled with SF6gas weight |
kg |
24 |
||
|
25 |
Weight per breaker |
kg |
1500 |
||
2)Main technical data of structure
|
No. |
N a m e |
Unit |
Value |
|
|
1 |
Auxilary circuit voltage |
V |
DC220V、AC220V |
|
|
2 |
Thevoltage/current of the openlng and closlng coll |
V/A |
DC110/4;DC220/2.5 |
|
|
3 |
Energy storage motor |
Rated voltage |
V |
DC220V、AC220V |
|
|
|
The range of normal working voltage |
V |
85%-110% |
|
|
|
Power |
w |
600 |
|
4 |
The energy storage time of motor |
s |
≤15 |
|
|
5 |
The loop voltage of the heatar and the lamp |
V |
AC220V |
|
|
6 |
Rated voltage of the auxllary switch |
V |
DC220V、AC220V |
|
|
7 |
Rated current of the auxiliary switch |
A |
10 |
|
|
8 |
Contacts of the auxiliary switches |
|
10normal opened contacts and 10 normal closed contacts |
|
3)Mechnical adjustment of the breaker
|
No. |
N a m e |
Unit |
Value |
|
1 |
Center dlstance between poles |
mm |
3000-4000 |
|
2 |
Strode length of the moving contact |
mm |
160±3 |
|
3 |
Contact stroke length of the moving contact |
mm |
50±2 |
|
4 |
Switch-off time |
mm |
30±5 |
|
5 |
Swltch-on tIme |
m/s |
90±15 |
|
6 |
Break tlme |
m/s |
≤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 diffarence of the closing of three phases |
ms |
≤5 |
口Order notice
□The type and the speclflcatlon of the clrcult breaker.
□Rated electric parameter(voltage,current,rated short-circuit breaking current and so on).
□Environmental condition(temperature,altitude,filth level and so on).
□Rated alectric parametar of control loop(rated voltage of energy storage motor,rated voltageo fthe opening and closing coils).
□The name and the number of the accessories when required.
□The connection direction of the primary upper terminal.
□Outline dimension
□As per the drawing below.
□LW-252 circuit breaker weight:4500kg.
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