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
Categories | SF6 Circuit Breaker |
---|---|
Brand | JUCRO |
Model | LW□-252/4000-50 |
Update Time | Dec 11,2024 |
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 |
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
Strong package, Safety first.
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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