Applicable standards pertaining to switching surges

Consult Table 2 for the standards applicable to VCB switching surges.

Table 2 Applicable Standards Pertaining to Switching Surges

Circuit

 

Load type

 

 

 

 

 

 

breaker

 

Rotating

 

Dry type

Oil-immersed

 

When there is

Phase advance

type

 

machine *1

 

transformer

transformer

 

electronic

capacitor *4, *5

 

 

 

 

(insulation

(insulation

 

equipment on

 

 

 

 

 

resistance

resistance

 

transformer

 

 

 

 

 

below

class A)

 

low voltage

 

 

 

 

 

class A)

 

 

side

 

Ordinary

 

Protected by CR

 

Protected by

No special

 

Protected by CR

6.6 kV circuit:

 

 

suppressor *6

 

surge

restrictions

 

suppressor *6

No special

 

 

 

 

suppressor

 

 

 

restrictions

 

 

 

 

 

 

 

 

up to 300 kVA

Low surge

 

No special

 

No special

No special

 

Protected by CR

6.6 kV circuit:

type

 

restrictions *2

 

restrictions *3

restrictions

 

suppressor *6

No special

 

 

 

 

 

 

 

 

restrictions

 

 

 

 

 

 

 

 

up to 4000 kVA

*1.

Mainly induction motors, but also includes synchronizing generators for private generator

 

equipment.

 

 

 

 

 

 

*2.

Use a CR suppressor for surge protection when inching at 55 kW (75HP) or below and on

 

inductance regulators.

 

 

 

 

*3.

Use an arrester for surge protection on circuits that require cutting off of excitation rush current.

*4.

When the capacity of the group of capacitors exceeds 300 kVA, insert a series reactor (6%).

*5.

For high-frequencies included in the applicable circuit, use 135% or below of the fifth harmonic

 

as established in the standards for phase advance capacitors (JIS C 4801).

 

*6.

Table 3 shows the models of applicable CR suppressor.

 

 

 

 

 

Table 3 CR Suppressors

 

 

 

 

 

 

 

 

 

 

 

 

Circuit voltage

 

CR suppressor model

 

 

 

 

6.6 kV

 

NV60K304T1

 

 

 

 

 

 

 

 

(three-phase)

 

 

 

 

 

 

 

 

 

 

 

 

 

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Toshiba H6A-HLS, HV6CS-MLD operation manual Applicable standards pertaining to switching surges

H6A-HLS, HV6CS-MLD specifications

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