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Sunday, October 17, 2010

Blackout Restoration Procedure (Substation Operation and Maintenance)

Since a super typhoon is expected to make a landfall here in the Philippines tomorrow, utmost preparation is being implemented by the Substation and Transmission Line personnel. Previous typhoons have caused blackouts so a possibility for another blackout is likely to happen.

Typhoon Preparedness Checklist: Preparing for the Coming of Super Typhoon Juan (International Name: Megi)

As we brace ourselves for the incoming Super Typhoon Juan (international name: Megi), here are a few checklist that we have implemented to minimize the damaging effect of the passage of typhoon to our Substation:

Tuesday, October 12, 2010

Root Cause Analysis: Preventing the HV Current Transformer from Exploding

The golden rule of high voltage instrument transformers is that " Never open a Current Transformer, and Never short a Potential/ Voltage Transformer". In this case, a current transformer has been left open because one slide of the terminal block was at open position. Probable cause is that the last maintenance group which conducted testing on the current transformer forgot to slide back the terminal blocks after they have isolated it. Anyways, the report submitted regarding the problem is stated below:

Monday, October 4, 2010

Emergency Shutdown of Power Circuit Breaker (Arcing due to Insulator Cleaner)

I. Background of the Problem:

115kV Power Circuit Breakers were scheduled for maintenance on September 29, 2010. The breakers were maintained one at a time. The testing for Breaker 1 started at 0601H and ended at 1024H. The testing for Breaker 2 started at 1026H and ended at 1152H. Initial results of the tests were satisfactory for both breakers.