1.Overview
ZN73(VS1)-24 indoor high-voltage vacuum circuit breaker, hereinafter referred to as the circuit breaker, is a switch-gear for three-phase AC 50/60Hz power system , with a rated voltage of 17.5-27kV. As a protection and control unit for power grid equipment/industrial and mining enterprise power equipment , it is suitable for frequent operation and has the ability to make multiple breaks and fast re-closures .
The circuit breaker adopts an integrated design of the operating mechanism and the circuit breaker body, which can be used as a fixed installation unit ，It can also be used as a separate handcart when combined with a chassis vehicle .
2.Standards on which the product is based
The circuit breaker complies with the standards of GB1984-1989 AC High-Voltage Circuit Breakers , JB3855-1996 3.6-40.5KV Indoor AC High-Voltage Vacuum Circuit Breakers , and DL403-1933 Technical Specifications for Ordering 10-35KV Indoor High-Voltage Vacuum Circuit Breakers . Additionally, it meets the relevant requirements of IEC56 (87 publication) .
3.Environmental conditions for operation
a . Ambient temperature
Maximum temperature: +40°C Minimum temperature: -30°C
b. Ambient humidity
Daily average relative humidity: ≤95%
Monthly average relative humidity: ≤90%
Daily average vapor pressure: ≤2.2×106 Pa (or≤2 .2MPa)
Monthly average vapor pressure: ≤1.8×106 Pa (or ≤1.8MPa)
c . Altitude: not exceeding 1500 meters
d. Seismic Intensity: not exceeding 8 degrees (on the Richter scale for seismic intensity)
e . Operating Environment
No dripping water;
No risk of flammability and explosion;
No chemically corrosive gases;
No severe vibrations .
4. Technical data
The main technical parameters of the circuit breaker are shown in Table 1 .
| No. |
Project |
Unit |
Data |
||||||
|
1 |
Rated voltage |
KV |
24 |
||||||
|
2 |
Rated insulation level |
1-minute power frequency withstand voltage |
KV |
65 |
|||||
|
Lightning impulse withstand voltage |
KV |
125 |
|||||||
|
3 |
Rated frequency |
Hz |
50/60 |
||||||
|
4 |
Rated current |
A |
630 |
1250 |
1600 |
2000 |
2500 |
3150 |
|
|
5 |
Rated short-circuit breaking current (Thermal stability) current |
KA |
20 |
25 |
|
|
|
|
|
|
25 |
31 .5 |
31 .5 |
31 .5 |
31 .5 |
31 .5 |
||||
|
31 .5 |
40 |
40 |
40 |
40 |
40 |
||||
|
6 |
Rated short-circuit opening and closing current (Dynamic stability) current |
KA |
50 |
63 |
|
|
|
|
|
|
63 |
80 |
80 |
80 |
80 |
80 |
||||
|
100 |
100 |
100 |
100 |
100 |
100 |
||||
|
7 |
Rated short-circuit duration |
S |
4 |
||||||
|
8 |
Rated short-circuit breaking times |
Times |
30 |
||||||
|
9 |
Rated operating sequence |
|
O—CO—180S—CO |
||||||
|
10 |
Rated breaking current of a single capacitor bank |
A |
630 |
||||||
|
11 |
Rated back-to-back capacitor group breaking current |
A |
400 |
||||||
|
12 |
Rated closing capacitor bank surge current |
|
12 .5(frequency not exceeding 10000Hz) |
||||||
|
13 |
Total breaking time |
ms |
80 |
||||||
|
14 |
Mechanical lifespan |
Times |
20000 |
||||||
|
15 |
Allowable cumulative thickness of wear for dynamic and static contacts |
mm |
3 |
||||||
The mechanical characteristic parameters of the circuit breaker are shown in Table 2
|
No. |
Project |
Unit |
Data |
||
|
1 |
Contact opening distance |
mm |
13±1 |
||
|
2 |
Over-travel |
mm |
3.5±0.5 |
||
|
3 |
Three-phase asynchronous disconnection |
ms |
≤2 |
||
|
4 |
Bouncing time of closing contact |
ms |
≤2（3） |
||
|
5 |
Inter-phase center distance |
mm |
275±1.0 |
||
|
6 |
Rated short-circuit breaking current |
KA |
25 |
31.5 |
40 |
|
7 |
Contact pressure of closing contact |
N |
2400±200 |
3100±200 |
4500±200 |
|
8 |
Average closing speed |
m/s |
0.6~1.1 |
||
|
9 |
Average opening speed |
m/s |
1.1~1.7 |
||
|
10 |
Closing time |
ms |
≤100 |
||
|
11 |
Opening time |
ms |
≤50 |
||
|
12 |
Main circuit resistance of each phase |
μΩ |
630A ≤50 1250～2000A ≤40 2500～3150A≤25 |
||
|
13 |
Rebound amplitude of contact opening |
mm |
≤3 |
||
The technical parameters of the circuit breaker operating mechanism are shown in Table 3 .
| No. | Project | Unit | Data | |
| 1 | Rated operating voltage | Opening coil | V | DC220/DC110 AC220/AC110 |
| Closing coil | ||||
| 2 | Coil power | Opening coil | W | 255/302 |
| Closing coil | 255/302 | |||
| 3 | Energy storage motor power | W | 90 | |
| 4 | Rated voltage of energy storage motor | V | DC220/DC110 | |
| 5 | Energy storage time | S | ≤15 | |
5.Outline dimension diagram
