ZN63-24 Vacuum Circuit Breaker
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Product Introduction
Ⅰ. Overview:
ZN63A-12(VS1) type indoor high-voltage vacuum circuit breaker (hereinafter referred to as circuit breaker) is rated voltage 12kV, three-phase AC 50Hz indoor high-voltage switch-gear, as power grid equipment, industrial and mining enterprise power equipment protection and control unit, suitable for the rated working current requiring frequent operation or multiple times to break the short-circuit current places.
The circuit breaker adopts the operating mechanism and circuit breaker body integrated or designed, can be fixed installation unit, can also be equipped with a special chassis car, to form a handcart unit for use.
Ⅱ. Model and meaning:
Ⅲ. Environmental conditions for use:
1. Altitude: no more than 2000m;
2. Ambient temperature: upper limit +40°C, lower limit -15°C (storage and transportation allowed at -30°C);
3. Relative temperature: the daily average is not more than 95%, the monthly average is not more than 90%;
4. There is no danger of fire, explosion, serious pollution, chemical corrosion and violent vibration.
Ⅳ. Main features and advantages:
1. Reliable modular spring operating mechanism, convenient installation and maintenance;
2. New high vacuum, ultra-low resistance type vacuum interrupter, strong breaking ability, fast insulation recovery speed, low contact resistance;
3. Complete specifications, rated current from 630A to 4000A, short circuit breaking current from 20kA to 50kA;
4. Two mounting methods: fixed type and handcart type;
5. Complete antimisoperation interlock to ensure the safety of personnel and equipment;
6. Easy to operate and minimal maintenance workload.
Ⅴ. Main technical parameters:
Circuit breaker main technical parameters (see Table 1);
Table 1 Main technical parameters of circuit breaker
|
No. |
Item |
Unit |
Data |
||||
|
1 |
Rated Voltage |
kV |
24 |
||||
|
2 |
Rated frequency |
Hz |
50 |
||||
|
3 |
Rated lightning impulse withstand voltage (peak) |
kV |
75 |
||||
|
4 |
Rated short-time frequency withstand voltage (1min) |
kV |
42 |
||||
|
5 |
Rated short-circuit breaking current |
kA |
20 |
25 |
31.5 |
40 |
50 |
|
6 |
Rated current |
A |
630 1250 |
630 1250 |
1250 1600 2000 2500 |
1250 2000 2500 3150 |
2000 2500 3150 4000 |
|
7 |
Rated short-time withstand current (RMS) |
kA |
20 |
25 |
31.5 |
40 |
50 |
|
8 |
Rated peak withstand current (peak) |
kA |
50 |
63 |
80 |
100 |
125 |
|
9 |
Rated short-circuit closing current (peak) |
kA |
50 |
63 |
80 |
100 |
125 |
|
10 |
Rated short-circuit current duration |
$ |
4 |
||||
|
11 |
Mechanical life |
Ops |
20000 |
||||
|
12 |
Secondary circuit frequency withstand voltage(1min) |
V |
2000 |
||||
|
13 |
Rated operating sequence |
O-t-CO-180s-CO O-t-CO-180s-CO |
|||||
Note:
When rated short-circuit breaking current is less than 40kA, t=0.3s;
When it is greater than or equal to 40kA, t=180s.
Circuit breaker mechanical characteristics (see Table 2)
Table 2 Mechanical characteristic parameters of circuit breaker
|
No. |
Item |
Unit |
Value |
|
1 |
Contact opening distance |
mm |
11±1 |
|
2 |
Contact travel |
mm |
3±0.5 |
|
3 |
Contact closing bounce time |
ms |
≤2(40kA≤3) |
|
4 |
Three-phase switching non-simultaneity |
ms |
≤2 |
|
5 |
Average closing speed |
m/s |
0.9~1.3 |
|
6 |
Average closing speed |
m/s |
0.5~0.8 |
|
7 |
Breaking time (rated voltage) |
ms |
≤50 |
|
8 |
Closing time (rated voltage) |
ms |
≤70 |
|
9 |
Rated closing and breaking operation voltage |
V |
AC110220,DC110220 |
|
10 |
Rated voltage of energy storage motor |
V |
DC110220 |
|
11 |
Rated power of energy storage motor |
W |
70(40kA 100) |
|
12 |
Energy storage time |
S |
10 |
|
13 |
Cumulative permissible wear thickness of dynamic and static contacts |
mm |
3 |
|
14 |
Resistance of main electric circuit |
630~1250A 1600~2000A over 2500A |
≤50μQ ≤40μ Ω ≤35y0 |
Ⅵ. Working principle of product structure:
6.1 The circuit breaker outline and installation dimensions are shown in Figure 1 to Figure as below: Withdrawable ZN63A Dimensions:
The mesh size of dynamic and static contacts is not less than 15mm, and the primary phase spacing is 210±1.5mm
|
Rated current(A) |
630 |
1250 |
1600 |
|
Rated short circuit breaking current(kA) |
2,025 |
20.25.31.5.40 |
31.5 |
|
Matching static contact size(mm) |
φ35 |
49 |
φ55 |
6.2 Action principle Figures as below are the structure diagram of the mechanism action:
closing release 17. Closing half shaft 18. Transmission claw
one-way clutch 20. Energy storage shaft 21. One-way bearing
Energy storage indicator 23. Bearing 24. Arm
buffer 26. Main shaft 27. Auxiliary switch
Opening spring 29. Opening release valve
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