BS IEC/IEEE 60214-2:2019 TAP-changers Application guidelines

Oil-immersed transformers
Electrical transmission systems
Power transformers
Tap-changing equipment
Switches
Resistors
Mechanical testing
Selector switches
Performance testing
Electric reactors
Electrical testing
Induction-voltage regulators

Link: BS IEC/IEEE 60214-2:2019 TAP-changers Application guidelines
Source: BSI Standards