cable

cable

CABLE DIAGNOSTIC UNIT:

PD MAPPING
function: scanning and tracing medium voltage(33 and 11 kv) underground cable

tester: Partial Discharge mapping (PD mapping)

IR TESTING IR = insulation resistive

genting sunyen dengkil

doing pressure test on main busba

power solvent 20

this liquid was used to removed dirt(carbon) at circuit breaker compartment and busbar contact and surface.

120 ohm thermostat

33kv main busbar

potetial transformer fuse

rating: 36 kv, 3.15A , model: ABGNA 7/92

connection of potential transformer

PT fuse holder

PT fuse holder contact

this part was connected between PT fuse and cable busbar

current tranformer (CT)

CT function is to step down current charge in cable busbar to set current.

Potential Transforment (PT) compartment

ULTRA TEV

this handy device have 2 function:
1.ultra sound
2.TEV( transient earth voltage)






ultrasound inspection made for checking circuit breakers compartment condition.
ultrasound checking more to surface inspection.

type of sound produced when a compartment had a problem :
1.corona
2.arking
3.tracking

reading:

0 - -ve dB : ok
1 - +ve dB : not ok



TEV inspection is more to secondary part (relay, thermometer)

TEV reading:

1 - 6 v : internal dischage
7 - 29 v : surface discharge
30v and above : floating metal


primary part: busbar, cable, poteintial transformer and current tranformer

following substation unit

VISIT PPU MUTIARA RINI DAMANSARA

type of breaker:
11 kv : AIS (air insulated switchgear)
33kv : GIS (gas insulated switchgear)

JOB:
servicing breakers:
1. cleaning breaker's surface with cotton.
2. spray breaker gear with WD40
3. testing breaker with manually tripping.

11kv breakers serviced done by TNB
33kv breakers serviced done by manufacturer ABB