Transformer explosion and fire at K R Thoppur substation, Tamil Nadu
June 2018Published 20 Sept 2026Responsible editor: Chief Editor
- Where
- 400/230kV substation at K R Thoppur near Tharamangalam, Tamil Nadu
- Operator
- Tamil Nadu Transmission Corporation Limited (TANTRANSCO)
- What
- Transformer exploded at 8.30am and fire broke out fuelled by oil
- Injuries
- None reported
- Outcome
- Power restored to all affected areas by 5pm same day
Get the next one by email
Free alerts on grid infrastructure incidents in India, and an email when EIR-1125 is updated. No account needed; unsubscribe in one click.
Confirm your email and every substation and transformer incident on the register arrives at once as a spreadsheet (CSV), free.
Get a free sample brief Three complete verified records and the incidents-per-GW table, by email within a minute.
We will also email you about the register's paid records and plans, at most once a week and three times in all. You can stop these at any time. By signing up you agree to the privacy policy.
Companies named in the reporting of this entry (being named is not a finding of fault): Tamil Nadu Transmission
What happened
A transformer at a 400/230kV substation operated by Tamil Nadu Transmission Corporation Limited (TANTRANSCO) at K R Thoppur, near Tharamangalam, exploded around 8.30am. Within minutes a major fire broke out, fuelled by the transformer oil. Substation staff alerted fire and rescue services, and five fire tenders from the Salem Steel Plant and Tharamangalam were deployed. It took more than three hours to bring the fire under control. No casualties were reported.
The explosion and subsequent power cut affected areas in the district as well as the neighbouring Dharmapuri and Namakkal districts. Workers removed the damaged transformer and installed a replacement within hours, with power restored to all affected areas by 5pm the same day.
Contributing factors
The fire was fuelled and prolonged by the oil contained within the transformer, a known characteristic of oil-filled transformer failures.
Lessons learned
- Oil-filled transformers can sustain fires for hours once ignited, so operators should arrange access to specialist fire tenders and plan for long response times.
- Spare units kept ready allow fast replacement of failed transformers and limit outage length.
More lessons on outages, backup supply and restoration, from every incident on the register.
Not yet known
- Cause of the transformer explosion
- Transformer model and age
- Cost of damage and replacement
This entry is updated when these are reported. Get an alert for the next one like it.
Published 2026-09-20. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.
