Nepal | July 03, 2020

Lack of grid synchronisation affects power supply in Valley

Pushpa Raj Acharya
Share Now:

Kathmandu, March 8

Lack of proper protection system in Nepal-India power grids for electricity trade has been causing repeated technical glitches in the central grid.

As Khimti-Dhalkebar transmission tower started tripping on Tuesday night, power supply to the central grid was affected and it took around an hour to recover supply.

Until Nepal Electricity Authority (NEA) installs all required protection measures, which is called power grid synchronisation, more of such technical glitches can be expected in the coming days whenever big consumers (industries) stop using power and there is suddenly high current flow to the central grid.

Currently, NEA has been bringing imported power to Kathmandu via Dhalkebar-Khimti transmission line without carrying out grid synchronisation between the power grids of India and Nepal. The repeated technical glitches in the central grid due to lack of proper protection system has posed a risk of the central grid collapsing.

Nepal has been importing 145 megawatts of electricity through Muzaffarpur (India) to Dhalkebar (Nepal) cross-border transmission line. A large chunk of the imported electricity is being supplied to Kathmandu and when the problem occurs in Dhalkebar-Khimti transmission towers the whole power supply system in the central grid gets affected.

As per its plan to end load-shedding, NEA started bringing imported power to Kathmandu after completion of Khimti-Dhalkebar transmission line. However, the power utility overlooked the possible risks like system failure due to lack of grid synchronisation.

The Nepal-India joint committee has already finalised study on grid synchronisation at 220 kV level, which has suggested the need to install df/dt relay (a special system used to identify abnormal changes in frequency and take remedial actions to prevent overload and the resulting blackout) and direct communication system between Dhalkebar Substation and load dispatch centre of Nepal.

However, the 220 kV substation in Dhalkebar is yet to be completed. According to NEA officials, it will take another three months for the Dhalkebar substation to be completed. “Without completion of 220 kV substations, we cannot carry out power grid synchronisation as recommended by the joint study team,” one high level official at NEA told The Himalayan Times on condition of anonymity.

Though it will take several months before the grid synchronisation process can be carried out, the power-starved NEA decided to bring imported electricity to Kathmandu by installing only normal protection measures within a short period of time to end the rolling blackouts of Kathmandu Valley from this dry season (December to May).

NEA officials have said that the grid synchronisation will be conducted during wet season when country itself has sufficient power as generation of run-of-the-river (RoR) projects increases.


Additional 100 MW to be imported

KATHMANDU: Following the transmission line upgradation of Kataiya-Kusaha and Raxaul-Parwanipur transmission line, Nepal Electricity Authority (NEA) is preparing to import additional 50 megawatts electricity from each for this dry season (till May or June).

The power utility has proposed NTPC Vidyut Vyapar Nigam Ltd (NVVN) to sign power purchase agreement for up to 100 MW more. NVVN is the nodal agency appointed by Indian government for cross-border electricity trade. Currently, NEA is importing 130 MW from Kataiya-Kusaha and 10 MW from Raxaul-Parwanipur. “We have written to NVVN and negotiations will be held soon,” said Prabal Adhikari, chief of Power Trade Department of NEA. “We are trying to import 100 MW additional power by this dry season.”


A version of this article appears in print on March 09, 2017 of The Himalayan Times.


Follow The Himalayan Times on Twitter and Facebook

Recommended Stories:

More from The Himalayan Times:

City honour Liverpool - then hammer them 4-0

MANCHESTER: Manchester City generously applauded new champions Liverpool onto the field before their Premier League match on Thursday -- and promptly showed no mercy by thrashing them 4-0 at the Etihad stadium. With the title secured a week ago, there was little at stake for Juergen Klo Read More...

Real Madrid close on title as Ramos late show sinks Getafe

MADRID: Real Madrid captain Sergio Ramos kept his nerve to score a late penalty and secure a hard-fought 1-0 home win over Getafe on Thursday for a sixth consecutive La Liga victory to take his side one step closer to winning the title. Ramos coolly passed the ball into the net to brea Read More...

File photo of the headquarters of the World Health Organisation in Geneva

Pay attention to mental health, prevention of suicide: WHO

Kathmandu, July 2 With the COVID-19 pandemic still spreading and impacting people in multiple ways, World Health Organisation today called upon South-East Asia region countries, including Nepal, to pay greater attention to mental health and suicide prevention. “Hitting lives and livelihoods, Read More...

Government urged to make transport service effective

Workers in transportation sector face risk of losing their livelihood as the service is yet to resume KATHMANDU, JUNE 2 National Assembly lawmakers have drawn the attention of the government to the need of making transport service effective by adopting required health safety measures as life h Read More...

EU, UNICEF to prevent malnutrition in Nepal

KATHMANDU, JULY 2 European Union and UNICEF have expanded their partnership on nutrition to prevent malnutrition in children due to the socio-economic impact of the pandemic. Socio-economic impact of the COVID-19 crisis has pushed many vulnerable families across Nepal into deeper poverty and h Read More...

Bill proposing facilities for local reps tabled

POKHARA, JULY 2 Amid protest from the opposition party, a bill was tabled in the Provincial Assembly meeting of Gandaki Province proposing facilities for local level representatives today. Minister of Internal Affairs and Law Hari Bahadur Chuman tabled the bill which proposed facilities for me Read More...

Girls join hands to fight against drug abuse

KAPILVASTU, JUNE 2 Girls of Shivapur of Shivaraj Municipality in Kapilvastu district have joined hands against drug addiction. Girls associated with Gautam Kishori Sambad, Saraswoti Kishori Sambad and Nabadurga Kishori Sambad located in Shivapur have launched campaign to control drug addiction Read More...

Officer, Public Service Commission, Government officer,

Upset Nayab Subbas vow to continue protest

KATHMANDU, JULY 2 Nayab Subbas (non-gazetted first class officers) have threatened to continue nationwide protest until their demands are met. They have demanded revision in a few provisions proposed in the Federal Civil Service Bill, passed recently by the State Affairs and Good Governance Co Read More...