Smriti Kak Ramachandran

The spate of power cuts is due to States not being able to adhere to grid discipline

The code specifies the fault clearance time

It is essentially a guidebook for the stakeholders

NEW DELHI: As Delhi grapples with under-frequency relays caused by persistent overdrawing of power from the Northern Grid, the State’s own Electricity Regulator has finally come out with a handbook that reinforces the rules of grid discipline.

Almost five years after the Electricity Act, 2003 came into effect, wherein a provision for a State grid code was made, the Delhi Electricity Regulatory Commission (DERC) has approved the Delhi Grid Code (DGC).

Drafted by Delhi Transco Limited (DTL) and approved by the DERC, the code lays down the regulations, guidelines and standards to be followed by stakeholders in the State Transmission System (STS) to develop, maintain and operate the system efficiently.

The grid code is applicable to the State Load Dispatch Centre (SLDC), every transmission licensee in the State and the State transmission utility.

“Delhi is the sixth State in the country to have its own grid code. The draft of the code, which was recently notified, was submitted in 2004 by the DTL. It is essentially a guidebook for the stakeholders involved in the generation, transmission and distribution of electricity,” said a Power Department official.

Every State Electricity Regulatory Commission is required to issue a State grid code, which is in accordance with the one specified by Central Electricity Regulatory Commission.

“The notification of the code has come at a crucial time when States have been chastised for failing to maintain grid discipline. The spate of power-cuts in the city that we have been witnessing for over a week is a consequence of States not being able to adhere to grid discipline,” say officials.

Laying down the rules, the DGC calls for distribution companies to establish distribution control centres and inform the SLDC of their energy requirements in detail.

The SLDC itself will have to ensure integrated operation of power system and monitor grid operations.

The code calls for generation companies to inform the SLDC about the details of power export contracts and lend a hand in the real time operation, control and scheduling of generation.

The SLDC has also been assigned to supervise overall operation of state transmission utilities, develop the procedure for islanding and load-shedding. The code specifies the fault clearance time as well; for a fault on the 400 kV line and above, the time limit to rectify it is 100 milliseconds and 160 milliseconds if the fault is of a 220 kV line.