Indoor fixed type vacuum circuit breaker
General:The vacuum circuit-breakers of type VD4/S are intended for indoor installa…
Indoor fixed type vacuum circuit breaker

Indoor fixed type vacuum circuit breaker

Detailed description

  • Description
  • Technical data
  • Guideline values for function times:

General:
The  vacuum  circuit-breakers  of  type  VD4/S  are  intended  for  indoor  installation  in  air-insulated switchgear  systems.  They  have  a  switching  capacity  capable  of  handling  the  loads  occurring  at start-up and shutdown of equipment and plant units both in normal and in fault state.Vacuum  circuit-breakers  have  particular  advantages  for  use  in  networks  where  there  is  a  high switching  frequency  in  the  working  current  range  and/or  where  a  certain  number  of  short-circuit breaking  operations  are  expected.  Type  VD4/S  vacuum  circuit-breakers  are  suitable  for autoreclosing, and have exceptionally high operating reliability and long life. The  vacuum  circuit-breakers  of  type  VD4/S,  designed  in  column  form,  can  be  supplied  both  as individualunits for switchgear T ype SM6, Uniswitch, HXGN, etc.
Standards and specifications 
Switchgear manufacture
The  switchgear  complies  with  the  following  specifications  in  accordance  with  DIN,VDE  and  the relevant IEC publications: 
• VDE0670, part1000 and IEC60694 
• VDE0671, part100, and IEC62271-100. 
• GB1984-2003 
Installation  and  operation  The  relevant  specifications  are  to  be  taken  into  account  during installation and operation, particularly: 
• DIN VDE0101, Power installations exceeding  AC1 kV 
• VDE0105, Operationof electrical installations
• DIN VDE0141, Earthing systems for special power installations with rated voltages above1 kV 
•  Accident  prevention  regulations  issued  by  the  appropriate  professional  bodies  or  comparable organizations. 
Operating conditions 
Normal  operating  conditions  Design  to  VDE  0670,  part  1000,  “Common  specifications  for high-voltage switchgear and controlgear standards“ and IECpublication60694, with the following limit values: 
•  Ambient temperature: 
–Maximum +40℃
–Maximum24 hour average +35℃
–Minimum (according to “minus5 indoor class”) –5℃
• Humidity: 
–the average value of the relative humidity , measured over a periodof24 h, doesnot exceed95% 
–the average value of the water vapour pressure, over a period of24 h, does not exceed2,2 kPa 
–the average value of the relative humidity , over a period of one month, does not exceed90% 
–the  average  value  of  the  water  vapour  pressure,  over  a  period  of  one  month,  does  not  exceed  1,8 kPa 
• Maximum site altitude: ≤1000 M above sea level. 
Specialoperating conditions: 
Special operating conditions are to be agreed onby the manufacturer and user . The manufacturer must be consulted in advance about each specialoperating condition: 
• Site altitude over1000 m: 
–Allow for the reduction in the dielectric strengthof the air . 
• Increased ambient temperature: 
–Current carrying capacity is reduced. 
–Provide additional ventilation for heatdissipation. 
• Climate: 
–A void the risk of corrosion or other damage in areas: 
• with high humidity and/or
• with major rapid temperature fluctuations. 
–  Implement preventive measures (e.g. electric heaters) to preclude condensation phenomena 


No.

Item

Unit

Parameters

1

Rated voltage

kV

12/17.5

24

2

Rated frequency

Hz

50/60

3

Rated current

A

630/800/1250/1600

4

1min Power frequency withstand voltage

kV

38/42/45

50

5

Lightning impulse withstand voltage

kV

75/95

125/150(*)

6

Rated short circuitbreaking current (peak)

kA

50/63/80

7

Rated shortbreaking current

kA

20/25/31.5

8

Rated short circuit making current (peak)

kA

50/63/80

9

Cable chargebreaking current in earthing fault

A

20

20

10

Rated withstand current (peak)

kA

50/63/80

11

Short time withstand current (4s)

kA

20/25/31.5

12

Mechanism life

times

10000

13

Operation sequence


O-0.3-CO-180S-CO

14

Rateof riseof transient recovery voltage

kV/uS

0.34/0.42

0.47

15


Peak of transient recovery voltage

kV

20.6/30

41

No

Item

Unit

Parameter

1

Closing time approx

ms

60ms

2

Opening time approx

ms

Less than45ms

3

Arcing time (at50Hz)

ms

Less than15ms

4

Breaking time

ms

Less than 60 ms

Minimum command

5

T ime on closing

ms

20ms(¹)(120ms(²))

35ms(¹)(70ms(²))

6

Time on opening

ms

20ms(¹)(80ms(²)

20ms(¹)(50ms(²))

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