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Along with the industrial plug in relays, WoodBeam is able to offer a wide range of auxiliary relay devices to suit almost every typical substation and industrial application.
Electro-mechanical multi-trip relays remain the preferred option for a wide range of functions such as:
- Interfacing signals from protection relays where the required number of contacts exceed the number of protective relay contacts;
- Circuit breaker tripping where the trip coil power requirements exceed the protective relay contacts capacity;
- Where secure system lockout is required;
- Auxiliary trips to start backup protection timers start disturbance recorders and signal classical SCADA systems;
- Flagged follower relays for transformer oil & winding temperature alarm and trip, buchholz gas & surge;
- Monitor trip supply voltage, the trip circuit & coil integrity through continuous energisation of the relay coil ensuring failure is detected and alarmed;
- Intertripping of switchgear via pilot wires which may have an induced AC voltage. The pilot receive relay can be designed to discriminate between the induced AC voltage yet still provide a high speed trip from the DC trip signal.
Despite the maturity of the technology, electro-mechanical relays provide an array of useful characteristics including:
- High levels of electrical isolation between input and output circuits;
- A huge range of resistance between switch-on/switch-off;
- Many independent isolated outputs may be associated with one input;
- Physical ruggedness. Most relays can withstand massive short term overloads across both actuating and switching components;
- Relays are largely immune to electrical, radio frequency and other forms of radiation;
- High burden versions immune to capacitor discharge currents;
- Actuating voltages and currents are relatively uncritical;
- The operation of the relay is largely self evident making fault finding simpler;
- Innumerable switching configurations are possible;
- High speed operation;
- High visibility mechanical flags and latches provide non volatile memory and reset capabilities without the need for auxiliary supplies;
- Relative compactness considering the number of contacts possible per signal input;
- Proven field reliability;
- May be designed to discriminate between AC & DC inputs.
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