enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay Electromechanical relay principle Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts An automotive-style miniature relay with the dust cover taken off. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple ...

  3. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    The operating time of relay decreases with the increases in the current. The operation of the relay depends on the magnitude of the current. [33] An inverse definite minimum time (IDMT) relay is a protective relay which is developed to overcome the shortcomings of the definite time overcurrent (DTOC) relays. [1]: pp 30-31 [34]: 134

  4. Static relay - Wikipedia

    en.wikipedia.org/wiki/Static_relay

    In electrical systems, a static relay is a type of relay, an electrically operated switch, that has no moving parts. [1] Static relays are contrasted with electromechanical relays, which use moving parts to create a switching action. Both types of relay control electrical circuits through a switch that is open or closed depending upon an ...

  5. Solid-state relay - Wikipedia

    en.wikipedia.org/wiki/Solid-state_relay

    A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay , but solid-state electronics contain no moving parts and have a longer operational lifetime.

  6. Buchholz relay - Wikipedia

    en.wikipedia.org/wiki/Buchholz_relay

    Buchholz relays have a test port to allow the accumulated gas to be withdrawn for testing. Flammable gas found in the relay indicates some internal fault such as overheating or arcing, whereas air found in the relay may only indicate low oil level or a leak. [3] Through a connected gas sampling device the control can also be made from the ground.

  7. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    In many cases, it is possible to design a relay logic diagram directly from the narrative description of a control event sequence. In general, the following suggestions apply to designing a relay logic diagram: 1. Define the process to be controlled. 2. Draw a sketch of the operation process. Make sure all the components of the system are ...

  8. Mercury relay - Wikipedia

    en.wikipedia.org/wiki/Mercury_relay

    Normally closed mercury relay, with coil around top of tube and adjustable angle. A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts.

  9. Power system protection - Wikipedia

    en.wikipedia.org/wiki/Power_system_protection

    In a power plant, the protective relays are intended to prevent damage to alternators or to the transformers in case of abnormal conditions of operation, due to internal failures, as well as insulating failures or regulation malfunctions. Such failures are unusual, so the protective relays have to operate very rarely.