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RW 12 / 24 / 42 kV - 3-pole indoor load break switch

Application:

Indoor load break switches type RW and set of switch disconnectors with fuses type RW are used in indoor switchgears (voltage of 7,2-42 kV). They are designed to turn on and off currents do not exceed their rated current. The switch disconnectors with fuses type RWB have the ability to turn off short-circuit currents by cooperating with fuse disconnectors.

In the open state switches create the visible isolating clearance.

Construction and operation:

RW-type switches are three-pole devices with secant movement of blade of current path. The apparatus has modular design. The permanent contacts are made of copper flat, covered with a layer of silver. High technical parameters are the result of the applied solution of the main path coupled with arcing contact. Opening and closing the arcing contacts is delayed compared to the main contacts (movable). During the shutdown process, arc quenching occurs at the arcing contact. Quenching occurs due to the compressed air outlet, through a nozzle (automatically when opening) connected by rapid streching of the arc. 

 The speed of closing and opening of the disconnector is independent of the operating speed. This is ensured by a step mechanism when closing and a spring mechanism when opening. Reinforcement of the step and storage mechanism is carried out by means of a motor or manual drive, after which both mechanisms are simultaneously reinforced during the closing process. The load break switches RW can be driven by manual drives NR1-01, NRWO-4, NR-3 as well as by motor drives NS-EL 30-03, NSP 30-04.

Advantages:

  • modular design
  • the possibility of building the drives of plane and rotory motion of the string
  • the possibility of choosing the side of mounting the drive (left-right)
  • cooperation with motor drives NS-EL 30-03, NSP 30-04 and manual drives NR-1, NRWO-4, NR-3
  • reliability
  • high technical parameters
  • possibility of equipping the switch with reactance insulators 12; 17,5; 24, 42 kV, electromagnetic release 24; 48; 110; 220 V AC/DC, auxiliary contacts showing the position of the device

Technical data:

 

PARAMETER

RW/RWB-12

RW/RWB-24

RW/RWB 42 kV

1

rated operating voltage

12 kV

24 kV

42 kV

2

rated frequency

50 Hz

50 Hz

 

3

DC rated current

630 A

630 A

 

4

operating switching capacity:

  • in circuit with low inductance
  • in circuit of ring network
  • charging cables and outdoor lines
  • off load transformers of low power
  • 630 A
  • 630A
  • 50A
  • 1250 kVA
  • 630A
  • 630A
  • 25A
  • 1250 kVA
  • 630A
  • 630A
  • 25A
  • 1250 kVA

5

max. current of fuse switch disconnector

200 A

200 A

200 A

6

rated short-circuit current

63 kA

63 A

63 A

7

withstand peak current

63 kA

63 kA

63 kA

8

withstand peak current 3 s.

25 kA

25 kA

25 kA

9

resistance of the current path

60 μΩ

65 μΩ

65 μΩ

10

test voltage (50Hz) for insulation:

  • to earth and interpolar
  • between the contacts
  • 28 kV / 42GOST
  • 35 kV
  • 50 kV
  • 60 kV
  • 70 kV
  • 85 kV

11

impulse test voltage for insulation:

  • to earth and interpolar
  • between the contacts
  • 75 kV
  • 85 kV
  • 125 kV
  • 145 kV
  • 170 kV
  • 195 kV

12

weight:

  • without earthing switch
  • with earthing switch
  • set (cut-off switch with safety breakers)
  • 26 kg
  • 30 kg
  • 37 kg
  • 36 kg
  • 40 kg
  • 47 kg
  • 50 kg
  • 54 kg
  • 61 kg

13

mechanical durability

2000 cycles

2000 cycles

2000 cycles

 

TECHNICAL DRAWINGS:

Dimensions of load break switch RW 12 kV
Dimensions of load break switch RW 12 kV with lower earthing switch (UD)
Dimensions of load break switch RW 12 kV with fuses (RWB)
Dimensions of load break switch RW 24 kV
Dimensions of load break switch RW 24 kV with lower earthing switch (UD)
Dimensions of load break switch RW 24 kV with fuses (RWB)
Dimensions of load break switch RW 42 kV

All technical data presented in the catalog can be changed due to technological progress.

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