INTRODUCTION TO STATIC RELAYS

Characteristic Functions of Protection Relay

Characteristic Functions of Protection Relay: Characteristic Functions of Protection Relay elements using different operating principles. These principles and design criteria determine how well the basic function is performed and how in practice it deviates from the ideal. Static relays can achieve such a high performance that the departures from the ideal in practice are negligible. […]

Generator Transformer Protection

Generator Transformer Protection: Generator Transformer Protection – Protective relays, being component parts of electrical switchgear, should be closely associated with the control section of such systems, e.g. indicating and signalling systems. Thus the signalling and indicating systems must also be designed on a static basis. The plug in type modular chassis has been widely adopted already in electronic regulating and control equipment. […]

Overcurrent Relay

Overcurrent Relay: Overcurrent Relay – In a three phase system of relays, it is economical to build it on a single phase basis. Thus there will be three converter elements, one for each phase, but thereafter the rest of the circuits (e.g. measuring element, output element, etc.) will be common to all the three circuits. […]

Types of Protective Relays

Types of Protective Relays: Basically, Types of Protective Relays are analogue-binary signal converters with measuring functions. The variables such as current, voltage, phase angle or frequency and derived values obtained by differentiation, integration or other arithmetical operations, appear always as analogue signals at the input of the measuring unit. The output will always have a […]

Static Relay

Static Relay: The term ‘static relay’ is generally referred to a relay incorporating solid state components like transistors, diodes, resistors, capacitors, etc. In this type of relay, the functions of comparison and measurement are performed by static circuits wherein there are no moving parts. Accord­ing to a recent decision of the International Electrotechnical Commission (IEC), […]

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