TNBR MONTHLY INTELLECTUAL DISCOURSE

ACTIVITY ON 10/5/10

TITLE :

PILOT CABLE FAULT DETECTION USING TIME DOMAIN REFLECTROMETRY METHOD

PRESENTER :

MOHD. RUZLIN B. MOHD. MOKHTAR

DEPARTMENT :

CABLE DIAGNOSTIC

What is PILOT CABLE ??

- is a supervisory communication pilot cable

- laid underground side by side with the underground power cable

- have been used in TNBR for :

> unit protection scheme

> communication channel for telecontrol

> SCADA Purposes

PILOT Cable construction

Two types of pilot cable used in distribution system :

- 12 pairs & 37 pairs for 11kV system

- 37 pairs for 33kV system

Fault Locating Method :

(a) Conventional Method : personalizing and thumping

(b) New method : Time Domain Reflectrometry (TDR)

Pilot cable Fault Types :

- open circuit

- short circuit

- splice/joint

- wet splice

- high resistance splice

- transceiver

- tap / lateral

- water ingress

- split and resplit

- cross