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  2. Power system protection - Wikipedia

    en.wikipedia.org/wiki/Power_system_protection

    Power system protection is a branch of electrical power engineering that deals with the protection of electrical power systems from faults [citation needed] through the disconnection of faulted parts from the rest of the electrical network. The objective of a protection scheme is to keep the power system stable by isolating only the components ...

  3. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    The distinction between digital and numerical protection relay rests on points of fine technical detail, and is rarely found in areas other than Protection [28]: Ch 7, pp 102 . Numerical relays are the product of the advances in technology from digital relays. Generally, there are several different types of numerical protection relays.

  4. Numerical relay - Wikipedia

    en.wikipedia.org/wiki/Numerical_relay

    Protective relay. In utility and industrial electric power transmission and distribution systems, a numerical relay is a computer-based system with software-based protection algorithms for the detection of electrical faults. [1] Such relays are also termed as microprocessor type protective relays.

  5. ANSI device numbers - Wikipedia

    en.wikipedia.org/wiki/ANSI_device_numbers

    In electric power systems and industrial automation, ANSI Device Numbers can be used to identify equipment and devices in a system such as relays, circuit breakers, or instruments. The device numbers are enumerated in ANSI/IEEE Standard C37.2 Standard for Electrical Power System Device Function Numbers, Acronyms, and Contact Designations.

  6. Recloser - Wikipedia

    en.wikipedia.org/wiki/Recloser

    Interrogation and remote operation capabilities allow utilities to aggregate data about their network performance, and develop automation schemes for power restoration. Automation schemes can either be distributed (executed at the remote recloser level) or centralized (close and open commands issued by a central utility control room to be ...

  7. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay ...

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  9. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    Figure 1 shows a typical relay logic diagram. In this circuit, a STOP/START station is used to control two pilot lights. When the START button is pressed, the control relay energizes and its associated contacts change state. The green pilot light is now ON and the red lamp is OFF.

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