Protective Relays
Protective Relays
Protective relays are devices that protect the power system components and devices from damage and short-circuiting by breaking the circuit and opening the power switches (such as CB). For the power switch to open, its operating coil (bobbin) must be energized. Relays do this feeding. A relay is a device that is stimulated by changing electrical quantities such as voltage and current or physical quantities such as temperature and oil displacement (in Buchholz relay) and causes other devices to operate and, as a result, break the circuit from the power switch.
Relay manufacturing technology
In terms of manufacturing technology, relays are divided into three types:
electromechanical
relays, static relays, and digital relays. Electromechanical relays are the
oldest types that are limited
in use and have been replaced by digital relays. Static devices are based on
analog electronic
devices and, therefore, cannot be programmed.
In digital relays, the processor analyzes the error
current and sends the appropriate command. These relays can be programmed
and have several
different performance characteristics. In these types of relays, several
different functions that were
performed using separate relays can be integrated into one relay. Of course,
this can reduce the
reliability of the protective system. However, the use of digital relays is
currently the main
protective option.
Application of protective relays
-
Overcurrent protection
-
Engine protection
-
Transformer protection
-
Capacitor bank protection
-
Feeder protection
-
Spark protection
-
Earth error protection
-
Voltage and frequency protection
-
Reconnect relay
-
Differential protective relays
Some products of IRUS Energy Co.
- 6MD662-664 Bay Control Unit
- 7UM61x Multifunction Generator Protection Relay
- 7SA6xx Distance Protection and Control
- 7SJ602 Overcurrent and Overload Relay
- DISTANCE MICOM P441 311B2M0310J AREVA
- Overcurrent relay REJ 523
- Transformer protection and control RET615 IEC
- Transformer protection and control RET615 IEC
- T42 Transformer demanding applications
- G87 Generator customised applications
Having several years of experience in the field of the electricity industry, IRUS Energy Group has the honor of supplying, installing, and after-sales services of protective relays of all kinds of brands in the world, including Schneider, Siemens, ABB, and Hyundai brands.
