NTDC’s tampered conductors caused Oct blackout: Nepra

Published May 19, 2023
The Natio­nal Electric Power Regula­tory Authority (Nepra) on Monday decided to conduct an independent investigation into the countrywide power outage on Saturday night. — APP/File
The Natio­nal Electric Power Regula­tory Authority (Nepra) on Monday decided to conduct an independent investigation into the countrywide power outage on Saturday night. — APP/File

ISLAMABAD: A six-member probe committee of the National Electric Power Regulatory Autho­rity (Nepra) has held the National Transmission and Despatch Company (NTDC) responsible for the national power breakdown in October last year.

In a detailed inquiry report, the committee lamented NTDC for using 26-year-old and tampered conductors and inordinate delays in the completion of a dedicated transmission line for 2,200MW of newly energised nuclear power plants.

The inquiry committee also observed that a joint venture of another state-run National Engineering Services of Pakistan (Nespak) and Barqaab had vetted for too long the power evacuation from K2/K3 nuclear plants thr­o­ugh an interim arrangement involving too many joints and a number of different clamps which could not sustain frequency fluctuation.

More ironically, the rep­ort noted that remedial recommendations following a previous breakdown in 2021 were not adhered to and even the system sho­rtcomings identified at the time of Oct 13, 2022 bre­akdown for urgent rectification could not be removed seven months down the road till conclusion of the inquiry report on May 11. The inquiry, however, appreciated that system revival after the breakdown was reasonably quick.

The inquiry committee had checked the entire system from Karachi in the south to Ghazi Barotha in the north from all technical angles and found the initial cause of tripping to be overheating and consequently damage of T-clamps and conductor at the temporary diversion between location number 26A and 27 of 500kV K2/K3-NKI circuit for the evacuation of power of K2/K3 plants. “Since the construction of dedicated transmission line for evacuation of power from K2/K3 could not be completed by NTDC, the interim arrangement was made which is continuing for an indefinite period as the dedicated T/Line is still incomplete”, the report said.

The report highlighted that the interim arrangement for K2/K3 power evacuation was vetted by Nespak and Barqaab joint venture being the consultant while the contractor for the project was Potential Engineers (Pvt) Ltd.

“The interim arrangement involves several joints, that too with different types of clamps, such as T-clamps and L-clamps, as per the availability at the time of execution,” said the report, adding that “conductor of transmission lines being used for interim arrangement is about 26 years old and installed in a heavily coastal polluted area, is deteriorated”.

At first, the fault developed on 500kV NKI - K2/K3, circuit due to overheating and breakage of T-clamps of the jumper which resultantly tripped from both ends. “This caused the shifting of load, about 2,700MW of China Power Hub Generation Company Ltd (CPHCL) and K2/K3, on remaining two circuits between K2/K3 and Jamshoro, as CPHGCL-Jamshoro circuit was already under scheduled outage”.

So far as failure of hardware within three years of commissioning is concerned, it’s because of improper interim arrangement, with non-standard or non-specified hardware material and lack of periodic maintenance of transmission lines as per standard operating procedures.

Published in Dawn, May 19th, 2023

Follow Dawn Business on Twitter, LinkedIn, Instagram and Facebook for insights on business, finance and tech from Pakistan and across the world.

Opinion

On writing

On writing

There is no ceremony or ritual that marks any person as a writer except the simple yet unimaginably significant act of starting to write.

Editorial

A way forward
Updated 17 Jul, 2024

A way forward

Before political leaders inflict more damage, they must give talks a chance.
Export delusions
17 Jul, 2024

Export delusions

THE trade ministry’s ‘plan’ to almost double exports to $60bn over the next three years is nothing more than...
Diversity in UK politics
17 Jul, 2024

Diversity in UK politics

THE recent UK elections have ushered in the most diverse parliament in the nation’s history. Under the leadership...
Banning PTI
Updated 16 Jul, 2024

Banning PTI

It appears that the govt and its backers within the establishment have still not realised that they are in uncharted territory.
Nato at 75
16 Jul, 2024

Nato at 75

EMERGING from the ashes of World War II, and locked in confrontation with the Soviet-led Communist bloc for over ...
Non-stop massacres
16 Jul, 2024

Non-stop massacres

Netanyahu is cunningly pretending to talk peace while mercilessly pounding Gaza. What is clear is that a return to pre-Oct 7 status quo is impossible.