Tapchanger Control Unit (TCU)

Is your tapchanger limiting performance?

Many tapchanger drive mechanisms and associated Automatic Voltage Control (AVC) schemes on the UK network are non-operational and stuck on ‘fixed tap’ due to ageing or faulty components.

This can lead to voltage constraints and reduced system efficiency.

Introducing the TCU solution

Fundamentals has developed the Tapchanger Control Unit (TCU) to address issues caused by outdated or failed control equipment within tapchanger drive mechanisms.

TCU key features:

Compatible with 230Vac motor voltages
110Vac control circuit (compliant with UK DNO specifications)
Flexible mounting options: vertical or horizontal
Pre-wired looms and socket connections
User-friendly local control and isolation switches
Blocking contactor and MCB shunt trip for AVC runaway prevention and lockout
Tap duration and supply fail timers with configurable volt-free alarm contacts
Electronic or mechanical tap counter options
Tapchanger motor current monitoring functionality
Complete design documentation: schematic, wiring diagram, and general arrangement pack
Trialled and tested with UK DNOs

TCU benefits:

Unlock ‘fixed tap’ schemes
Extend lifetime of existing transformers
Interface compatible with all types of tapchanger
Fast installation kits designed to minimise transformer outage times
Increased reliability and performance

Our services include:

Supply of complete TCU kits (including DSS assembly)
Supply of separate DSS assemblies for ATL AT type, Fuller F, FBA, and HS type drive mechanisms
Installation and commissioning of TCU / DSS assemblies, including integration with existing AVC schemes