SF6 circuit breaker
The vacuum circuit-breakers of type VD4/S are intended for indoor installation in …
SF6 circuit breaker

SF6 circuit breaker SF6 circuit breaker SF6 circuit breaker

Detailed description

  • Description
  • VD4/R-SEC
  • Fixed type
  • Lateral type
  • Standing type
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 individual units for switchgear Type SM6, Uniswitch, HXGN, etc.  
Main technical data
No. Item Unit Technical data
1 Rated voltage kV 12/17.5 24 36/40.5
2 Rated insulation level
 
1 min Rated short time power frequency withstand voltage 42 65 95
3 Rated lighting impulse withstand voltage (peak) 75 125 185
4 Rated frequency Hz 50/60 50/60 50/60
5 Rated current A 630 630 1250 1250
1250 1250 1600 1600
/ / 2000 2000
/ / 2500 2500
/ / 3150 3150
/ / 4000 4000
6 Rated short circuit breaking current kA 20 25 31.5 40
7 Rated short time withstand current 20 25 31.5 40
8 Rated peak withstand current 50 63 80 100
9 Rated short circuit making current (peak) 50 63 80 100
10 4S thermal stability current 20 25 31.5 40
11 Rated dynamic stability current 50 63 80 100
12 Rated capacitor bank making inrush current 12.5(The frequency is not more than 1000Hz)
13 Rated single/back-to-back capacitor bank breaking current A 630/400
14 Rated short circuit duration S 4
15 Secondary loop power frequency withstand voltage V 2000
16 Rated operation voltage Closing coil AC 110/220  DC 110/220
Tripping coil AC 110/220  DC 110/220
Energy storage motor AC 110/220  DC 110/220
17 Closing time (rated voltage) ms 20~50
18 Tripping time (rated voltage) 30~70
19 Dynamic, static contacts permit abrasion total thickness mm 3
20 Energy storage time s ≤15
21 Contact opening distance mm 9±1
22 Contacting travel 3~4
23 Contact bouncing time ms ≤2
24 Different period of three-phase break and close brake ≤2
25 The average opening velocity1 ms 0.9~1.3
26 The average opening velocity2 0.4~1.0
27 Contact opening rebound amplitude mm ≤2
28 The main circuit resistance   Rate current(A) Handcart type(μΩ) Fixed type(μΩ)
630 55 45
1250 45 40
1600~2000 35 30
      2500 and above 25 20
29 Rated operating sequence3   C-2S-CO-180-CO
30 Mechanical life Times 20000(KA)
VD4/R - VD4/L - VD4/UniAir - VD4/UniMix - VD4/R-SEC - VD4/L-SEC
nstallation and operating instructions
The VD4-R each pole houses a vacuum interrupter which is encased in the resin when the cylinder is moulded thanks to a special manufacturing process.
This construction method protects the vacuum interrupter from shock, pollution and condensation.
The operating mechanism is the EL trip-free stored energy type with independent opening and closing regardless of the opera-tor’s action. The EL operating mechanism is widely used in all VD4 series circuit-breakers with frontal control.
The circuit-breaker can be remote controlled when fitted with dedicated electrical accessories (gearmotor, opening and closing release).
The operating mechanism, the three poles and the current sensors (if provided) are installed on a metal frame without wheels. The construction is particularly compact, sturdy and of limited weight.
VD4 series circuit-breakers with lateral operating mechanisms are life-long sealed pressure devices
(Standards IEC 62271-100).

Size for 12kV, 17.5kV Indoor Vacuum Circuit Breaker (Lateral Fixed Type)

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