First Week

• followed the maintenance gang
• checking current fault by using earth fault indicator(EFI)
• EFI is the faulty cable length is easy located by tracing the last indicator that has been tripped and the first indicator which has not tripped. The faulty section can be switched off and the rest of the cable can be put into operation again.
• The Led will be placed outside the substation so that it is easier for the technician to see which substation has tripped. For each EFI,they have different bits set to be set occording to the specifications given by the engineers. Each type of bit sets are representing the duration of time for the EFI to keep operating when trip happened.
• Learned about system, safety and things in pencawang elektrik (P/E) which is switchgear,lower voltage distribution board(LVDB) and transformer.
• get to know a few designs and brands for switchgear and how it operates
• transformers - a few specifications, has tap changer which will be set to 11 kV (number 3)
• After P/E, there is PAT or also known as pencawang atas tiang which is functioning as a P/E.
• In PAT we have transformer, drop fuse, black box, and also LVDB.
• See the powerful and dangerous model of switchgear, which is the vacuum circuit breaker (VCB). Battery charger is used to supply the VCB.The vacuum will cover the circuit from blow.
• There are relay in VCB. When trip occur,current produced was large,so the relay use a ratio to minimize the current.If the relay did not minimize the value of the current,it may cause damage to the relay and switch box.
• involve in cabling the earthing cable in a P/E. the cable need to be replace because the old cable has been stolen.
• Learned about how many LVDB should be place in one P/E.