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TRANSFORMER MAINTENANCE
Objective of Maintenance For achieving the maximum availability of this Service in the power system, standard procedures of transformer…
2022-12-26Explore a subject
Switchgear
Get to know circuit breakers, isolators, busbars and substation equipment.
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Transmission
On-Load Tap Changers: How Transformers Adjust Voltage
An on-load tap changer (OLTC) lets a transformer adjust its voltage ratio in steps while continuing to supply its load. It changes which…
2026-10-31
Switchgear
Transformer Oil Dielectric strength
Transformer oil Insulating oil in an electrical power transformer is commonly called as transformer oil. It can be obtained by fractional…
2022-11-25
Generation · Switchgear
DC Systems in Generating Stations
Why a DC supply is used A station DC system supports control and protection equipment that must remain available when the normal AC supply…
Guide
Switchgear
Current Transformers
Purpose A current transformer, or CT, provides a reduced representation of current to instruments and protective relays. Metering and…
Guide
Switchgear
Clamps and Connectors in Power Systems
Mechanical and electrical roles Clamps and connectors are fittings used to attach or join conductors and related equipment. A connection…
Guide
Switchgear
Isolators in Substations
Purpose An isolator, also called a disconnector, separates a circuit from a supply. It is part of an isolation arrangement; the presence of…
Guide
Switchgear
Electrical Insulators
The basic function An insulator separates an energized conductor from another conductive part while also supporting a mechanical load.…
Guide
Switchgear
Electrical Busbar
This electrical Busbar training course introduces basic safe operational and field diagnostics of busbars with a focus on safe operation,…
2022-11-25
Switchgear
Battery Charger Functions in a Station DC System
The charger’s role A station charger converts AC supply to DC for the station system and battery. The exact architecture and operating…
Guide
Protection · Switchgear
Anti-Pumping Relay: Why a Circuit Breaker Does Not Keep Closing
An anti-pumping function prevents a circuit breaker from repeatedly closing and opening in response to one continuous closing command. The…
2026-10-31
Switchgear · Protection
Current Transformer FAQ: Ratios, Burden and Safety
A conventional current transformer (CT) helps instruments and protective relays work with a representation of alternating current flowing…
2026-10-31
Transmission · Switchgear
Busbar FAQ: Arrangements, Materials and Safety
A busbar is a common conductor used to connect electrical circuits. In a substation, it provides a connection point for circuits operating…
2026-10-31
Switchgear
SF6 Circuit Breaker Gas Compartments
A sulfur hexafluoride (SF 6 ) circuit breaker uses gas as part of its current-interruption system. The National Instructional Media…
2026-10-31
Transmission · Switchgear
Gas-Insulated Substations: An Introduction
Gas-insulated switchgear (GIS) can form part of a substation's switching arrangement. Its configuration depends on the equipment selected.…
2026-10-31