Relays microprocessor-based

Electromagnetic These are quickly outdated but we discuss these relays briefly below to give an idea of the basic operating principles of such relays. The same principle of application is then transformed into a static or microprocessor-based relay... 

The follow ing are the normal protections that may be available in both-a solid-state ora microprocessor-based relay, making them a single-device protection ... 

It is mandatory to employ only static or microprocessor-based relays, components and devices wherever possible. 

The above discussion is generally related to IC-based solid-state relays and in most parts to microprocessor-based relays of tbe more rudimentary types. 

Control and relay panel (which may be microprocessor based), to record, display, monitor and control the generated power, voltage and frequency and also detect fault conditions. 

Static thermal relay (discrete ICs or microprocessor based) For medium and large motors, 300 h.p. and above, this type of protective relay should be preferred to achieve optimum utilization of the motor s capacity. Consider the available setting ranges in the vicinity of... 

This is the brain of a plasma system. It controls all the process variables type of gas, pressure, gas flow rate, power level, and processing time. It may be as simple as discrete relays, timers, and needle valves or, it might a microprocessor based system with sophisticated displays, fully automated process control, multi-process capabilities, electronic data-output, and alarm systems. 

This microprocessor-based recorder is capable of simultaneously monitoring 30 analog points, and 8 AC signals. It has relay outputs used for control purposes. Figure 4 shows inputs and outputs. 

Four main units are used in the IMCS, which are the motor control unit (MCU), the feeder control unit (FCU), the circuit breaker control unit (CBCU) and the central control unit (CCU). A MCU is a microprocessor (micro-computer) based module which has integrated control, monitoring, protection functions, and a communication interface for the motor starter. An FCU is very similar to a MCU and interfaces communication for the plain feeder contactor or circuit breaker. A CBCU is also similar to a MCU but is used for incomers, interconnectors and busbar section circuit breakers. A CCU provides the facility to communicate simultaneously with MCUs, FCUs, CBCU, a distributed control system (DCS), system control and data acquisition (SCADA) and other digital information systems. Other discrete devices such as special protective relays can also be addressed by the CCU provided the software and porting systems are compatible. 

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