Home     ZW20-12 10KV High voltage vacuum circuit breaker on outdoor column

产品名称：ZW20-12 10KV High voltage vacuum circuit breaker on outdoor column

产品应用： Product overviewZW20 outdoor high-voltage AC vacuum circuit breaker is an outdoor high-voltage switchgear with rated

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产品介绍

Product overview

 
ZW20 outdoor high-voltage AC vacuum circuit breaker is an outdoor high-voltage switchgear with rated voltage of 12kV three-phase AC 50Hz. It is mainly used to turn on and off load current, overload current and short circuit current of power system. The products are suitable for protection and control of substation, industrial and mining enterprises, urban and rural networks, especially for frequent operation places and urban automatic distribution networks.

Application environment conditions:
 
Ambient air temperature: -40℃ ~ +40℃;
 
Relative humidity: monthly average ≤90%, daily average ≤95%;
 
Altitude: ≤2000m;
 
Earthquake intensity: ≤8;
 
Wind speed: ≤34m/s (equivalent to 700Pa on the surface of the cylinder);
 
Pollution level: Level IV (the corresponding creepage distance of insulator is 31mm/kV);
 
Case protection grade: IP67, considering condensation and precipitation;
 
Thickness of ice cover: ≤10mm;
 
Installation site: it should be free from inflammable, explosive, chemical corrosion and regular violent vibration.
 
Performance Features:
 
L Overall structure superior L flexible and convenient L good insulation performance L reliable sealing performance L variable ratio arbitrary adjustable PT secondary output Transfer L flexible control interface L quality assurance system
 
technical parameters：

Table 1 Main technical parameters of circuit breaker

Number
  • Name
  • Unit
 Number
l nominal voltage kV 12
2 rated current A 630
3  rated frequency Hz 50
4
  • Rated peak withstand current
 kA 50
5 Rated short-time withstand current kA 20
6 Rated short circuit switching current kA 20
7 Rated short-circuit closing current (peak) kA 50
8
  • rated duration of short-circuit
 S 4
9 rated lmin Power frequency withstand voltage (effective value)(wet) dry phase, ground/fracture kV (34)42/48
insulation Rated lightning) medium impact pressure (peak) phase, to the ground/fracture kV 75/85
level Secondary loop LMIN power frequency withstand voltage kV 2
10
  • Rated operating sequence
   O-0.3s-CO-180s-CO
ll Rated short circuit current switching times second-rate 30
12 mechanical life second-rate 10000
 
Table 2 Main mechanical characteristic parameters of circuit breaker
 
Number
  • Name
  • Unit
  • numeric value
l clearance between open contacts mm 9±l
2
  • over-travel of the contact
 mm 3±l
3 opening time mS 18～45
4 closing time mS 20～60
5
  • Max.bouncing duration
 mS ≤2
6 The switching and closing of the three-phase system is out of synchronization mS ≤2
7 Average breaking speed m/S 1．2±0．2
8 Average closing speed m/S 0．6±0．2
9 Main circuit resistance (excluding cable) LlQ ≤120

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