Protective relay is a device which is activated because of electrical quantity change such as volt and current or physical quantity like thermal degree and oil move and it leads to start other devices and at last break the circuit by circuit breaker . It is used for earth or air feeders in distribution system power plants in different voltage levels. It is used for protection of low or medium voltage engine in industry like power station and oil refinery in order to warranty engine function and its safety such as assurance about overload status. Main protection of transformer means counting (unit) differential protection which is unit protection. With regard to transformer function importance toward continuous electrification , power transformer protection has a great importance. impedance protection is used for protection of transmission, so that it is possible to discover the kilometer area that the error was happened in it. This kind of protection is mentioned as main protection of airlines. borna niroo karan company(Brnika) is the exclusive representative of Ziegler and Sprecher Automation Contrel on buying, selling, consulting services for automation systems and protective relays including protective relays .
Product list of Protective Relay
Power controller RP7 type allows to control the delivered power from an a.c. voltage source to a resistance or resistance-inductive receiver of electrical energy and the rotational speed of 1-phase induction motors with a capacitor or commutator motors at small loads.
The RP1 power controller is destined for automatic temperature control systems in electrothermal devices.
The area of RPL1 application includes: - electric furnaces and drying structures, especially industrial furnaces and tunnel cap, furnaces for annealing and brazing, and founder crucible furnaces, drying ovens, furnaces with quenching in salt baths; - mechanical engineering equipment, aggregates and extruders for plastics processing, winding machines and tempering springs, spot welding and linear; - production of glass and glazing, plant and equipment for drying in the infrared and ultraviolet, vats for melting glass and heating trays for forming glass furnaces; - chemical and petroleum industry; radiators lining piping, wiring warming
The RP3 power controller is a contactless three-phase power energy electronic device which includes a thyristor connector and an electronic gate triggering system. (GTS)
The MDR-2 differential protection relay is a micro processor based control unit containing all necessary functions for monitoring of the differential currents for a synchronous/asynchronous generator or motor (the object). Via current transformers the MDR-2 measures each phase current on both sides of the object. The current transformers determine the limits of the protection area. Any failure within these limits (2- or 3-phase short circuits or earth leaks) will be detected as an error Id: Differential currents, the currents flowing through the two current transformers of the phase in question differ, and, if a preset limit value is exceeded, a warning will be given or a tripping signal transmitted. The MDR-2 dynamic compensation curves for warning and tripping are defined by the user.
The protective voltage relays types RMV-112D, RMV-122D and RMV-132D form part of a complete DEIF series of relays for protection and control of generators and are applicable to both marine and land-based installations. Also available are voltage relays for single phase measurement (RMV-142D). The voltage relays are applied for protection of generators, motors and transformers against adverse system voltage conditions.
The digital, combined under-frequency and over-frequency relay type RMF-112D forms part of a complete DEIF series of relays for protection and control of generators. The relay is type-approved by major classification societies and is applicable to both marine and land-based installations. The RMF-112D is applied for protection against under-frequency and over-frequency by supervising the frequency (of generators) in single phase and 3-phase networks.
The protective current relays types RMC-111D, RMC-122D and RMC-132D form part of a complete DEIF series of relays for protection and control of generators. The relays are applicable to both marine and land-based installations. Also available are differential current relays (RMC-131D)
The protective differential current relay type RMC-131D forms part of a complete DEIF series of relays for protection and control of generators, and is primarily designed for marine applications. The RMC-131D is type-approved by major classification societies and is applied for protection of for example generators in 3-phase networks against leakage currents.
The protective stator earth fault relay type RMC-142D forms part of a complete DEIF series of relays for protection and control of generators. The RMC-142D is primarily designed for land-based installations. The RMC-142D is CE-marked and is applied for protection of voltage sources and load networks against earth fault in a solid earthing or a low-resistance earthing system.
The loss of mains relay type LMR-111D forms part of a complete DEIF series of relays for protection and control of generators. A mains failure will be detected, provided a disconnection at an arbitrary point of the network results in a swift change of the generator frequency (vector shift). An opening signal is then transmitted to the mains circuit breaker, and the generator will thus be protected against damages caused by an automatic reconnection to the high-voltage network.
The DEIF loss of mains relay type LMR-122D forms part of a complete DEIF series of relays for protection and control of generators. A mains failure will be detected, provided a disconnection at an arbitrary point of the network results in a swift change of the generator frequency (vector shift). An opening signal is then transmitted to the mains circuit breaker, and the generator will thus be protected against damages caused by an automatic reconnection to the high-voltage network.