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Transformer and switchgear maintenance in a CMMS: PM schedules, test records and inspector-ready history as CEA names the standards behind Regulation 46
The Central Electricity Authority is taking comments until 15 November 2026 on a draft list of the standards behind its 2023 electrical-safety regulations, including the clause on transformer and switchgear maintenance schedules for substations with more than 2000 litres of oil-filled apparatus. This guide sets out what the regulations say, which intervals are actually written down, and how to run the work and the records in a CMMS.
By Upvantix team
A transformer and switchgear maintenance schedule protects you only if it is followed and recorded. A CMMS puts every transformer, breaker and panel in the asset register, builds PM schedules from the manufacturer's manual and the standards your engineers adopt, captures checklists and readings on each work order, and keeps a history the Electrical Safety Officer can show the Electrical Inspector.
The Central Electricity Authority (CEA) is taking comments until 15 November 2026 on a draft list of relevant standards behind its 2023 electrical-safety regulations. For the transformer and switchgear maintenance clause, Regulation 46(2)(vii)(d), the draft list names IS 2026 (Parts 1 to 7) and IS 3427. That clause applies to substations and switching stations with oil-filled apparatus holding more than 2000 litres of oil. Regulation 48 separately requires periodic tests and comparable records for installations above 650 V.
Why HT electrical maintenance slips
Transformers, HT breakers and ring main units (RMUs) sit outside the production line, so they get less planning attention than machines. The plan lives in OEM manuals and contractor reports, test reports arrive as PDFs or paper, and trips go into a register nobody links to the asset. When the Electrical Inspector asks for one transformer's history, someone rebuilds it from several places.
In October 2026, CEA's draft list of relevant standards was open for comment, naming the standards behind the clauses for HT installations, including the maintenance clause for substations with more than 2000 litres of oil-filled apparatus.
What CEA's 2023 Regulations and the draft list say about Regulation 46
The CEA (Measures relating to Safety and Electric Supply) Regulations, 2023 were notified on 8 June 2023. CEA's Chief Electrical Inspectorate Division prepared the draft list of relevant standards, citing Regulation 137 of the 2026 Amendment Regulations; comments go by post or to cea-eidivision@gov.in until 15 November 2026.
| Regulation | What it says | Standards named in the draft list |
|---|---|---|
| 46(2)(vii)(d), for substations with more than 2000 litres of oil-filled apparatus | Transformers and switchgears maintained to schedules prepared in accordance with the relevant standards | IS 2026 (Parts 1 to 7), labelled "Power Transformers (specifications and maintenance)"; IS 3427, labelled "Code of Practice for Maintenance of Switchgear" |
| 46(2)(i) | Safety clearances so apparatus can be operated and maintained without hazard | IS 5613; IS 732; IEC 61936-1 |
| 46(2)(vii)(a), for substations with more than 2000 litres of oil-filled apparatus | Separation or fire barrier walls between apparatus | IS 1646; IS 3034 |
| 46(2)(ix) | Automatic fire fighting for every transformer of 10 MVA and above | IS 15325; IS 15519, with the row marked "To check IS" in the draft |
| 48(5) to 48(7) | Periodic tests as per the relevant standards, and records comparable with past records | Not mapped in the draft list |
| 50(8) | Earthing systems tested for resistance to earth | Not mapped; the draft list maps 50(1) and 50(3) to IS 3043 |
Two points help. First, scope: the draft list cites the maintenance clause as "Regulation 46: (2) (d)", but in the 2023 Regulations as notified it is 46(2)(vii)(d), and it applies to substations and switching stations with oil-filled apparatus, such as transformers, switchgear or oil circuit breakers, holding more than 2000 litres of oil. It does not put every transformer above 650 V on a schedule. The wider duty is Regulation 48(5), which says all apparatus, cables and supply lines "shall be maintained in healthy conditions and tests shall be carried out periodically as per the relevant standards". Second, labels: the titles above are the draft list's labels. BIS catalogue titles for these standard numbers differ, and the draft list may change before CEA finalises it. For the fire rows, see fire protection maintenance in a CMMS.
Which intervals are actually written down
Three recurring intervals in the 2023 Regulations touch this work, and none is a transformer or switchgear service interval.
- Earthing, Regulation 50(8): every earthing system belonging to the supplier or the consumer is tested for its resistance to earth "on a dry day during dry season not less than once in a year", with records produced to the Electrical Inspector if required.
- Electrical Safety Officer, Regulation 5(3): in installations including factories with more than 250 kW connected load, and mines and oil-fields with more than 2000 kW, the Electrical Safety Officer carries out recommended periodic tests as per the relevant standards and inspects the installations "at intervals not exceeding one year", keeping records in Forms I to IV of Schedule II, test reports and a register of safety recommendations.
- Periodic inspection, Regulation 32(2): inspection by the Electrical Inspector, or self-certification, follows a periodicity "as directed by the Appropriate Government", which shall not exceed five years.
The 2023 Regulations and the draft list do not set a transformer oil-test interval or a breaker service interval. Those come from the manufacturer's manual and the standards your engineers adopt.
Building the PM plan in a CMMS
- Register each asset: every transformer, HT breaker, RMU, panel and earth pit, with location, rating, oil quantity, make and serial number. Recording oil quantity shows which substations fall under the more-than-2000-litre measures in Regulation 46(2)(vii).
- Attach documents: OEM manual, test certificates, single-line diagram and last inspection report.
- Create PM schedules from the OEM manual and the standards your electrical team adopts, and record which document each schedule comes from.
- Build checklists with reading fields. Examples include oil test results, insulation resistance, earth resistance and breaker operation checks. These are examples, not a mandated set.
- Assign qualified people. Regulation 3 requires designated persons for work on electrical lines and apparatus. Isolate through lockout-tagout and permit-to-work, and plan HT outages with shutdown planning.
- Capture the work on the work order: readings, photos and notes, with a corrective work order raised for any defect.
- Record trips and repairs against the asset, so the history meets Regulation 48(6): "Records of all tests, trippings, maintenance works and repairs of all apparatus, cables and supply lines shall be duly kept in such a way that these records can be compared with the past records." Readings tracked over time also support condition-based maintenance.
The inspector-ready record per asset
This is a recommended structure, not a CEA format.
| Field | What it holds |
|---|---|
| Asset and location | Transformer, breaker, panel or earth pit, and its substation |
| Rating and oil quantity | Including whether the substation exceeds 2000 litres of oil |
| PM task and source document | OEM manual or adopted standard behind the task |
| Due date and done date | From the PM schedule and the completed work order |
| Who did it | Designated person or testing contractor |
| Readings | Values captured on the work order |
| Result and defect work order | Pass, fail or action, and the corrective work order raised |
| Trip and repair log | Trippings and repairs against the asset |
| Test report | Attached report or certificate |
| ESO acknowledgement | Electrical Safety Officer review |
Forms I to IV of Schedule II are the regulations' own forms. A CMMS holds the evidence behind them; it does not file them.
Who does what
Under Regulation 48(7), the owner of installations above 650 V maintains and operates them "in a condition free from danger and as recommended by the manufacturer or by the relevant standards". The Electrical Safety Officer runs the periodic tests and inspections under Regulation 5(3). Designated persons under Regulation 3 do the work. The Electrical Inspector inspects, and Chartered Electrical Safety Engineers assist owners with self-certification under Regulations 6 and 32. OEMs and testing contractors do specialist tests. For other plant inspections, see statutory inspections under the OSH Code and boiler inspection records.
The CMMS holds the plan, the work orders and the evidence. It does not certify an installation or make a substation compliant.
How Upvantix CMMS fits
Upvantix CMMS is designed to organise maintenance around the asset: an asset register with equipment hierarchy, locations, documents and history; work requests and work orders with priorities, status and completion records; PM schedules, checklists and inspections; and parts, procedures and technical documents. At the point of work it offers asset lookup and QR access, procedures and checklists, photos, notes and measurements, and parts and time capture.
Operational AI by Upvantix, a capability inside Upvantix CMMS, is designed to ask across operational records, investigate similar issues, retrieve relevant documentation and prepare structured work for review. Human review required before operational action. Upvantix CMMS is designed for deployment in your AWS environment.
Talk to us about putting your transformers, switchgear and earth pits on a PM plan in Upvantix CMMS.
Common questions about transformer and switchgear maintenance
What does CEA Regulation 46 say about transformer and switchgear maintenance?
Regulation 46(2)(vii)(d) of the 2023 Regulations says "all the transformers and switchgears shall be maintained in accordance with the maintenance schedules prepared in accordance with the relevant standards". It sits under 46(2)(vii), which covers substations and switching stations with oil-filled apparatus holding more than 2000 litres of oil. Regulation 48 sets the wider testing and record duties for installations above 650 V.
Which Indian standards apply under CEA's draft list?
For the Regulation 46(2)(vii)(d) maintenance clause, which covers substations with more than 2000 litres of oil-filled apparatus, CEA's draft list names IS 2026 (Parts 1 to 7) for power transformers and IS 3427 for switchgear. The list is a draft, open for comment until 15 November 2026. BIS catalogue titles for these numbers differ from the draft's labels, and the final list may change.
How often should a transformer be maintained in India?
The 2023 Regulations and CEA's draft list set no transformer oil-test or servicing interval. Follow the manufacturer's manual and the standards your engineers adopt. The written intervals nearby are for earthing systems, tested at least once a year under Regulation 50(8), and for the Electrical Safety Officer's inspections, at intervals not exceeding one year under Regulation 5(3).
What maintenance records must be kept for HT installations?
Regulation 48(6) requires records of all tests, trippings, maintenance works and repairs, kept so they can be compared with past records. Where an Electrical Safety Officer is required, Regulation 5(3) adds records in Forms I to IV of Schedule II, test reports and a register of safety recommendations acknowledged by the owner, available to the Electrical Inspector.
Who needs an Electrical Safety Officer?
Under Regulation 5(3), the owner or management designates an Electrical Safety Officer for electrical installations including factories registered under the Factories Act, 1948 with more than 250 kW connected load, and mines and oil-fields with more than 2000 kW. The officer needs an electrical engineering degree with five years of operation and maintenance experience, or a diploma with ten years.
Can a CMMS make our substation CEA-compliant?
No. A CMMS plans the work, records tests, trips and repairs, and keeps the evidence in one history per asset. Compliance depends on the installation itself, the tests carried out, qualified people and the Electrical Inspector's inspection. What a CMMS gives you is an organised record when the Electrical Safety Officer or the inspector asks.
Is transformer maintenance CMMS or FSM work?
It is CMMS work when you maintain your own substation, transformers and switchgear inside your plant, hospital or building. It is FSM work if you are a service company maintaining transformers at customers' sites. CMMS and FSM are separate products; our guide on CMMS or FSM explains how to choose.