Vacuum Circuit Breaker (VCB) Retrofit
Description

Below are study cases of cubicle retrofit services. We are able to fix Cradle Circuit Breaker and the cubicle itself up to 3150Amp 36kV.

The photograph on the left shows the Meiden VFT-22s VCB before and after the retrofit service.
Technical Data

– Type of Old Circuit Breaker Meiden VFT-22s
[Old vacuum type]
– Type of New Circuit Breaker Travida ISM-24 [Vacuum Type]
– Rated voltage 24kV
– Rated impulse withstand voltage 125kV
– Rated power frequency withstand voltage 50kV
– Rated current 630A
– Rated short-circuit breaking unit 16kA
– Weight before retrofit +/- 300kg
– Weight after retrofit +/- 60kg

Testing and Commissioning
The electrical acceptance testing and commissioning of electric power systems is essential to the start up of any electrical system for the first time, regardless of its size, type or industry. It is a very special occurrence and poses some unique challenges to electrical personnel. Inexperience and poor planning will inevitably result in prolonged delays in the start up which can lead to costly productivity losses.

The testing and commissioning of high voltage electrical equipment is a highly specialised activity with each and every installation being tested by a trained engineer to exacting standards.

Powersystems testing capability covers an extensive range of disciplines:

Switchgear
AC pressure testing
Ductor testing
CT’s – Ratio & flick tests, Mag curves
VT’s – Ratio & polarity checks
Functionality checks
Protection testing

Protection
Primary and secondary injection
Timing tests
Overcurrent and earth fault relays
Directional Overcurrent and earth fault relays
Differential transformer protection
Translay and Solkor feeder unit protection
Restricted and standby earth fault relays
Generator loss of mains and G59 protection
Neutral voltage displacement
Transformer auto tapping relays
Intertripping schemes

Earthing
Soil resistivity measurements
Final earth electrode resistance

Transformers
HV & LV winding Insulation tests
Winding ratio checks
Bucholz testing
Oil sample and testing (electrical breakdown, acidity, water & PCB content, Disolved gas analysis)

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