Power Substation

  • ZW7-33 Outdoor HV Vacuum 33KV Circuit Breaker 
  • ZW7-33 Outdoor HV Vacuum 33KV Circuit Breaker 

ZW7-33 Outdoor HV Vacuum 33KV Circuit Breaker 

The 33kv circuit breaker is a kind of outdoor HV switching devices used in three-phase AC 50Hz 33kV. 

The 33kv circuit breaker is a kind of outdoor HV switching devices used in three-phase AC 50Hz 33kV. It uses spring operating mechanism or electromagnetic operating mechanism; it can be controlled to switch-on/off remotely; it can also be used to control energy storage and switch -on/off manually The breaker conforms to standards of GB1984-89 AC HV breakerand IEC56 AC HV breaker. It is used for protecting and controlling distribution systems in transformer substations, operating in gear and protecting the circuit in country electric nets, industrial and mining enterprises when short-circuit occurs. The breaker has porcelain post structure. The upper knob insulator has vacancy arc-extinguishing chamber while the nether one is post knob insulator. The breaker is suitable for the place where-frequent operation is allowed. The breaker has the performance of reliable seal, aging resistance, and flame resistance, explosion resistance,long mechanica life, simple installation and convenient debugging

Meaning of Type

Technical Data


The main technical parameters of the high voltage sf6 circuit breaker are shown in the table below


Table 1

NoItemUnitValue
1Rated yoltagekV40.5
2Rated currentA1600
3Rated frequencyHz50
4Rated short-circuit breaking current(Effective value)kA202531.5
5Rated short-circuit making current(peak)506380
6Rated peak withstand current506380
74s rated short time withstand current (Effective value)202531.5
8Power frequency withstand voltage (1 min)kVDry:95(Wet:80)
9Lightning impulse withst and voltage (peak)185
10Rated operating sequenceCO-0.3sCO-180s-CO
11Breaking times of rated short-circuit breaking currentTimes20
12Mechanical life10000
13Weightkg1000

The main mechanical characteristic parameters of the sf6 circuit breaker are shown in the table below


Table 2

No.ItemUnitValue
1Arc-extinguishing Clearance between contactsmm22±2
2Contact overtravel of arc extinguishing chamber5±1
3Center distance between phases710
4Contact closing bounce time of arc extinguishing chamberms≤5
5The time difference of the opening、closing of three phases≤2
6Average Switch-on speedm/s0.75±0.2
7Average Switch-off speed1.7±0.2
8Switch-on timems30~100
9Switch-off time15~60
10Main circuit resistance of each phase (excluding current
transformer)
μ  Ω≤100
11Allowable wear thickness of dynamic and static contacts in
vacuum interrupter
mm3
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