Things You Didn't Know About PT. Semesta Eltrindo Pura

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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