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BackHome > Products > High voltage switchgear
High voltage switchgearXGN66-12 indoor type alternating-current metal-enclosed switchgear
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XGN66-12 indoor type alternating-current metal-enclosed switchgear (hereinafter referred to as switchgear) is a new generation of HV electrical appliance set. It complies with GB3906 Alternating-current metal-enclosed switchgear for rated voltage of 3~35kV, DL404 Indoor AC high voltage switchgear panel, and IEC60298 A.C. metal-enclosed switchgear and controlgear for rated voltages above 1kV and up to and including 52kV. 
This switchgear adopts overseas advanced technologies, is designed and developed independently by our company, which solved the problems of high trouble rate and large size of similar products. It is featured with small size (only half volume of common cabinet), good breaker performance, high reliability, reliable and simple “five-prevention” interlocking mechanism, etc. 
It is applicable for three-phase single-bus segment systems of AC50Hz and 3.6-12KV, used for electric energy receiving and distribution, it controls, protects and monitors the circuits. It is widely used in power plants, substations, and industrial and mining enterprises, high-rise buildings, also can be used in switching stations with ring main unit. 
● Ambient temperature: -10℃~40℃; 
● Altitude: not exceed 1000m; 
● Daily mean of relative air humidity not exceed 95%, monthly mean not exceed 90%; daily mean of water vapor not exceed 2.2×10-3Mpa, monthly mean not exceed 1.8×10-3Mpa; 
● Cabinet body is made of angle steel by welding. 
● Circuit breaker chamber is located in the middle (lower) part of cabinet, it is convenient to install, debug and maintain. It is equipped with ZN63A(VS1-12) circuit breaker as the standard, and has pressure release channel that ensures personal safety. 
● Adoption of advanced and reliable rotary isolating switch that make it possible to enter into breaker chamber for overhaul under live condition of main bus. 
● Ingress protection level of the whole cabinet is IP2X. 
● Reliable and compulsory mechanical interlocking device that has complete functions and meet the “five-prevention” requirements. 
● Reliable ground system. 
● Inspection window in the door is convenient to view the working state of components inside the cabinet. 
● It adopts the same locking mechanism JSXGN with that of XGN2-12 switchgear for operating mechanism, which is simple and reliable to use. 
● Incoming and outgoing cables are lower than the front part of cabinet bottom that is convenient for user to connect. 
 A
  A
  uΩ
  KA 		 800
  630
  20
  50 		 1250
  1000、1250
  31.5
  80 		 2000-3150
  20000-3150
  40
  100
 Main circuit current  KA  ＜300
 Protection class    IP2×
 Phase-to-phase central distance
 Outline dim. (W, D, H) 		 mm
  mm 		 165±1
  900×1000×2300 		 210±1
  900×1000×2300 		 
  230±1
  1100×1000×2300

Note: it needs additional insulating separator if adopts the 840width.  

Main technical parameters of ZN73-12 vacuum circuit breaker 

 Item   Unit  VN3-12  VS1-12
 Rated voltage  KV             12
 1min power frequency withstand voltage  KV             42
 Lightning impulse withstand voltage  KV             75
 Rated frequency  Az             50
 Rated current 
 Rated short-circuit breaking current
 Rated short-circuit making current (peak)
 4s rated short-time withstand current
 Rated peak withstand current

 A
  KA
  KA
  KA
  KA

 630、1250
  20、25、31.5
  50、63、80
  20、25、31.5
  50、63、80 		 1600-3150
  31.5、40
  80、100
  31.5、40
  80、100
 Rated breaking current of back-to-back capacitor  A

 400

 Rated breaking current of single capacitor bank  A

 630

 Operating sequence  

 O-0.3S-CO-180s-CO

 Breaking current times   Times

 30

 Mechanical life  

 10000

 Rated tripping current   A

 5

 Rated operating voltage   Closing coil
  Opening coil 		 V

 DC220、AC220

 Circuit resistance   uΩ

 ≤35

 ≤40


Technical parameters of isolating switch 
Item  Unit  GN19-12C/630
  GN30-12/630
  GN30-12D/630 		 GN19-12C/1000
  GN30-12/1000
  GN30-12D/1000 		 GN19-12C/1250
  GN30-12/1250
  GN30-12D/1250 		 2000
  GN30-12/1250
  3150
 Rated voltage  KV

 12

 1min power frequency withstand voltage  KV

 42

 Lightning impulse withstand voltage (phase-to-phase, phase-to-ground / isolating distance)

 KV

 75/85

 Rated current   A  630  1000  1250  2000-3150
 4s short-time withstand current
 Rated peak withstand current 		 KA
  KA 		 20
  50

 31.5
  80

 40
  100
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