33KV Vacuum Circuit Breaker
Breaker Switch Unit with Encapsulated Vacuum Interrupter
Each vacuum interrupter is embedded in a solid-insulated pole made of weather-proof cyclo aliphatic epoxy resin. This enables a small design as well as resistance against environmental effects. The breaker switch unit is comprised of three poles, the operating mechanism, and the operating mechanism housing.
The sequence of the poles is A -B – C or 1 – 2 - 3 (sequence left to right when viewed from the lower terminal side of the recloser switch unit.
Breaker Principle and Design of 36KV Vacuum Circuit Breaker
ZW32 series Breakers are used in distribution systems. Circuit breakers are used to make and break normal and fault currents. Breakers are fully equipped with sensors and a controller to provide a means of protection and control. In case of a line fault, breakers can break and make currents several times, thus avoiding longer network interruptions due to temporary faults. The manufacture, design, and testing of the vacuum recloser is based on current standards IEC 62271-100.
Technical parameters of 33KV Vacuum Circuit Breaker
Table 1-Circuit Breaker Rated Technical Data
|
Name |
Unit |
Parameter |
||
|
1 |
Rated voltage |
kV |
36 |
|
|
2 |
1 min rated power frequency withstand voltage |
70 |
||
|
3 |
Rated lightning impulse withstand voltage (peak) |
170 |
||
|
4 |
Rated current |
A |
630 |
|
|
5 |
Rated frequency |
Hz |
50/60 |
|
|
6 |
Rated short-circuit breaking current |
kA |
||
|
7 |
Rated short-circuit making a current (peak) |
|||
|
8 |
Rated peak withstand current |
|||
|
9 |
Rated short-time withstand current (4s) |
kA |
||
|
10 |
Rated operating sequence |
O-0.3s-CO-180s-CO |
||
|
11 |
Closing time |
ms |
25-60 |
|
|
12 |
Opening time |
18-45 |
||
|
13 |
Breaking times for rated short-circuit breaking current |
times |
30 |
|
|
14 |
Mechanical life |
10000 |
||
|
15 |
Secondary circuit 1min power frequency withstand voltage |
V |
2000 |
|
|
16 |
Charging motor rated power |
W |
40 |
|
|
17 |
Charging motor rated voltage |
V |
DC24 |
|
|
18 |
Rated closing operation voltage |
DC24 |
||
|
19 |
Rated opening operation voltage |
DC24 |
||
|
20 |
Motor charging time |
s |
≤12 |
|
|
21 |
Weight |
Circuit breaker |
kg |
130 |
|
A circuit breaker with dis-connector |
165 |
|||
Table 2 - Main Mechanical Characteristics of Circuit Breaker
|
Name |
Unit |
Parameter |
|
|
1 |
Contact travel |
mm |
12-14 |
|
2 |
Contact over-travel |
2-4 |
|
|
3 |
Phase Distance (Center to Center) |
410±2 |
|
|
4 |
Contact closing bounce time |
ms |
≤3 |
|
5 |
Three-phase open/close synchronism |
≤2 |
|
|
6 |
Average opening speed |
m/s |
|
|
7 |
Average closing speed |
||
|
8 |
Resistance of the main circuit |
μΩ |
≤200 |
Table 3 – Main Technical Data of Dis-connector
|
Name |
Unit |
Parameter |
||
|
1 |
Rated voltage |
kV |
36 |
|
|
2 |
Rated current |
A |
630 |
|
|
3 |
Frequency |
Hz |
50/60 |
|
|
4 |
Short-time withstand current (4s) |
kA |
||
|
5 |
Rated peak withstand current |
|||
|
6 |
1min power frequency withstand voltage |
Across open contacts |
kV |
70 |
|
7 |
Circuit resistance |
μΩ |
≤120 |
|
|
8 |
Center deviation value of three-phase insulating closing |
mm |
≤2 |
|
|
9 |
Synchronism deviation value of three-phase insulator open/close |
≤2 |
||
|
10 |
Insulating distance between conductor to earth |
≥300 |
||
|
11 |
Contact travel |
≥260 |
||
Table 4 – Operating Mechanism Characteristics
|
Name |
Unit |
Parameter |
||
|
1 |
Opening coil |
DC24 |
7 |
Reliable tripping under 65%-120% rated voltage, no tripping less than 30% rated voltage |
|
DC110 |
5 |
|||
|
AC220 |
||||
|
DC220 |
||||
|
2 |
Closing coil |
DC24 |
7 |
Reliable tripping under65%-120% rated voltage |
|
AC220 |
||||
|
DC220 |
||||
|
3 |
Overcurrent tripping coil |
8 |
||
|
4 |
Energy charging motor |
Rated voltage: DC/AC220V Rated power: 40W |
Reliable tripping under85%-110% rated voltage |
|
|
5 |
Closing spring charging time |
≤10s |
||
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