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High voltage switchgearKYN28A-12 mid-set type metal-clad and metal-enclosed switchgear
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KYN28A-12(GZS1-12Z) mid-set type metal-clad and metal-enclosed switchgear (hereinafter referred to as switchgear) is a new type product designed and developed by our company with domestic and international advanced technologies, it is an ideal upgrading product for replacing the old metal-enclosed switchgear such as KYN1-10, JYN2-10, GBC-10 and so on. Its advantages as follows: 
●  The cabinet shell is made of al-zinc-coated steel sheet, through CNC processing and multiple bending technique, then assembled with bolts. It is featured with high mechanical strength, neat and elegant appearance, powder coating treated door, good shock and corrosion resistance. Ingress protection level of the shell reaches IP4X. 
●  Main switch of switchgear can be configured with VD4 vacuum circuit breaker and C3 series fixed type load switch from ABB corporation, also can be configured with many homemade vacuum circuit breakers (such as VS1, VH1, VK, ZN28) instead of overseas similar products. 
●  No matter which circuit breaker selected, make sure that the air insulation distance of its bare conductor is larger than 125mm, and compound insulation is larger than 60mm. The breakers are featured with long service life, high parameters, less maintenance, small size, etc. 
This switchgear is applicable for three-phase power grid of AC 50Hz and class 3.6~12kV, used for electric energy receiving and distribution, it controls, protects and monitors the circuits, can be used in single bus and single-bus segment system or dual-bus systems. This switchgear complies with IEC298 Alternating-current metal-enclosed switchgear and controlgear for rated voltage above 1kV and up to and including 52kV , IEC694 Common specifications for high-voltage switchgear and controlgear, GB3906 Alternating-current metal-enclosed switchgear for rated voltage of 3~36kV, DL404 Indoor AC high voltage switchgear panel, DIN.VDE0670 Alternating-current switchgear for rated voltage above 1kV, etc. It enjoys perfect and reliable anti-misoperation function. 
● Ambient air temperature: -15℃~+40℃;
● Relative humidity: daily mean not over 95%, monthly mean not over 90%;
● Altitude: not exceed 4000m;
● Seismic intensity: not beyond Ms8;
● The installation site should be free of fire, explosive danger, serious pollution, chemical corrosion or severe vibration.
Special requirements beyond above conditions should be determined by both users and manufacturer through negotiation.

Technical parameters of switchgear

Item   Unit Data
 Rated voltage
 Rated frequency 
 Rated current of circuit breaker
 Rated current of switchgear
 Rated peak withstand current (4s)
 Rated peak withstand current (peak)
 Rated short-circuit breaking current 
 Rated short-circuit making current (peak)
 KV
  Hz
  A
  A
  KA
  KA 
  KA
  KA
 3.6,7.2,12
  50
  630,1250,1600,2000,2500,3150,4000
  630,1250,1600,2000,2500,3150,4000
  16,20,25,31.5,40,50,63
  40,50,63,80,100,125,160
  16,20,25,31.5,40,50,63
  40,50,63,80,100,125,160
 Rated insulation level 1min power frequency withstand voltage
Lightning impulse withstand voltage
 KV
  KV 
 24
  40
 32
  60
 42
  75
 Protection class The shell is IP4X, and it is IP2X when the compartment door and circuit breaker chamber door are opened


Technical parameters of VD4 and VS1-12 vacuum circuit breaker 

Item  Unit  Data
 Rated voltage
 Rated frequency
 Rated current of circuit breaker
 Rated peak withstand current (4s)
 Rated peak withstand current (peak)
 Rated short-circuit breaking current
 Rated short-circuit making current (peak)
 KV
  Hz
  A
  A
  KA
  KA 
  KA
  KA
 3.6,7.2,12
  50
  630,1250,1600,2000,2500,3150,4000
  16,20,25,31.5,40,50,63
  40,50,63,80,100,125,160
  16,20,25,31.5,40,50,63
  40,50,63,80,100,125,160
Rated insulation level 1min power frequency withstand   KV
  KV 
42
75
 Rated operating sequence
 Rated short-circuit current breaking times
 Mechanical life 
 
  Times
 Times
O-0.3s-CO-180s-CO
  50
  2000

Mechanical characteristics of VD4 and VS1-12 vacuum circuit breaker 
When the circuit breaker is used to control the motor of 3~10kV, must apply metal-oxide arrester if the starting current is smaller than 600A, details should be determined by both users and manufacturer through negotiation. When the circuit breaker is used to disconnect the capacitor bank, rated current of the capacitor bank should not exceed 80% of rated current of circuit breaker.
Item  Unit Data
 Clearance between open contacts
 Overtravel
 Phase-to-phase central distance
 Closing contact bounce time
 Three-phase opening asynchrony
 mm
  mm
  mm
  ms
  ms
 11±1
  4±0.5 
  210±0.5,250±0.5,275±0.5 
  ≤2
  ≤2
 Breaking time at operating voltage of   Max
  Rating
  Min
 ms
  ms
 
 ≤50
  ≤50
  ≤60
 Closing time
 Average closing speed
 Average closing speed
 Conductive circuit resistance
 Contact pressure 
 ms
  m/s
  m/s
  μΩ
  N
 ≤100
  0.9-1.2
  0.6-0.8
  ≤40
  3200±100

Technical parameters of operating mechanism 
Item   Unit Value
 Rated operating voltage  Closing coil  V  DC220,110
 Closing coil  V  DC220,110
 Coil power  Closing coil  W  245
 Closing coil  W  245
 Power of energy-storage motor
 Rated voltage of energy-storage motor
 Energy-storage time
 W
  V
  S
 50
  DC220,110
  ≤10

Main technical parameters of ZN□-12 (VHI) vacuum circuit breaker
 Item  Unit Parameter
 Rated voltage
 Rated frequency
 Rated current
 Rated short-circuit breaking current
 Rated short-circuit making current
 Rated peak withstand current
 Rated short-time withstand current
 Rated short-circuit duration
 Rated breaking current of single capacitor bank
 Rated breaking current of back-to-back capacitor bank
 Power frequency withstand voltage
 Lightning impulse withstand voltage
 Rated short-circuit current breaking times
 Mechanical life
 KV
  Hz
  A
  KA
  KA
  KA
  KA
  s
  A
  A
  KV
  KV
  Times
 Times
 12
  50
  1250
  31.5
  80
  80
  31.5
  4
  630
  400
  42
  75
  50
  1000
 Rated operating sequence   O-0.3S-CO-180s-CO
 Opening time
 Closing time
 Control voltage 
 Power of closing coil 
 Power of opening coil 
 ms
  ms
  V
  VA
  VA
 
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