GB/T 2900.17-2024 Electrotechnical terminology - Measuring relays and protection equipment
1 Scope
This document gives the general terminology used in measuring relays and protection equipment, as well as general terms pertaining to specific applications and associated technologies.
It is applicable to the technical fields related to measuring relays and protection equipment.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
3.1 Terms relating to types
447-01-01
electric relay
device designed to produce sudden predetermined changes in oneor more electric output circuits, when certain conditions are fulfilled in the electric input circuits controlling the device
[SOURCE: GB/T 2900.83-2008. 151-13-31, modified.]
447-01-02
measuring relay
electric relay intended to operate when its characteristic quantity, under specified accuracy, attains its operate value
447-01-03
specified-time measuring relay
measuring relay with one or more specified time functions, where time characteristics are subject to accuracy requirements
447-01-04
dependent-time measuring relay
specified-time measuring relay whose operate time depends, in a specified manner, on the value of the characteristic quantity.
447-01-05
independent-time measuring relay
specified-time measuring relay whose operate time can be considered as being independent, within specified limits, of the value of the characteristic quantity.
447-01-06
electromechanical relay
electrical relay in which the intended response results mainlyfrom the movement of mechanical elements
[SOURCE: GB/T 2900.63-2003. 444-01-04, modified.]
447-01-07
electromagnetic relay
electromechanical relay in which the intended response is produced by means of electromagnetic forces
Note: An electromagnetic relay can be electromagnet type or induction type.
[SOURCE: GB/T 2900.63-2003. 444-01-05, modified.]
447-01-08
static relay
electric relay in which the designed response is developed by electronic, magnetic, optical or other components without mechanical motion
447-01-09
analogue relay, analog relay, US
electric relay whose operating function is achieved principally by analogue signal processing
447-01-10
digital relay
static relay whose operating function is achieved principally by digital signal processing
447-01-11
numerical relay
static relay whose operating function is achieved by algorithmic computation
447-01-12
polarized DC relay
measuring relay, the change of condition of which depends upon the DC polarity of its energizing quantity.
447-01-13
polarized AC relay
measuring relay, the change of condition of which depends upon the AC polarity of its energizing quantity.
Example: Directional overcurrent relays, mho relays.
447-01-14
protection relay
measuring relay that detects faults or other abnormal conditions in a power system or power equipment
Note: A protection relay is a constituent of protection equipment.
447-01-15
control relay
electric relay, the function of which is to control equipment
Note: A control relay can be a simple relay that translates an external command into a control signal [e.g. a command to close a circuit-breaker (IEV 441-14-20)], or it can be a more complex device (IEV 151-11-20) that translates an external command into a number of sequential control signals [e.g. the closing and opening of disconnectors (IEV 441-14-20) and circuit-breakers (IEV 441-14-05) to changeover a circuit from one busbar section to another]. A control relay can also supervise a characteristic quantity (e.g. voltage, frequency) and produce a control signal that is dependent upon its specific functional design (e.g. under frequency load shedding relay).
447-01-16
integrated protection relay
protection relay that combines more than one protection function within a single device (IEV 151-11-20)
447-01-17
integrated control relay
control relay that combines more than one control function within a single device (IEV 151-11-20)
447-01-18
integrated protection and control relay
electric relay that combines both protection and control functions within a single device (IEV 151-11-20)
447-01-19
adaptive relay
measuring relay, some or all of whose operating characteristics and/or settings can change automatically in response to changes in conditions of the external system
447-01-20
primary relay
electric relay directly energized by the current or voltage in a main circuit, without any intermediate instrument transformer (IEV 313-03-01), shunt (IEV 313-09-04) or transducer (IEV 321-01-01)
Note: The main circuit includes all the conductive parts, and is intended for transmitting electrical energy.
447-01-21
secondary relay
electric relay energized by the quantity (e.g. electric current or voltage) derived from an instrument transformer (IEV 313-03-01) or transducer (IEV 321-01-01)
447-01-22
shunt relay
electric relay energized by the current derived from a shunt in a main circuit (IEV 313-09-04)
Note: The main circuit includes all the conductive parts, and is intended for transmitting electrical energy.
447-01-23
over… relay
measuring relay intended to operate when its characteristic quantity increases to reach the setting value of the characteristic quantity.
Example: Overcurrent relay.
447-01-24
under… relay
measuring relay intended to operate when its characteristic quantity decreases to reach the setting value of the characteristic quantity
Example: Undervoltage relay.
447-01-25
under and over… relay
measuring relay with two setting values of the characteristic quantity, which is designed to operate when its characteristic quantity either increases to reach one setting value of the characteristic quantity or decreases to reach the other setting value of the characteristic quantity
447-01-26
rate of change of… relay
measuring relay intended to operate when its characteristic quantity changes by a given amount per unit of time
Example: Rate of change of frequency relay.
447-01-27
current relay
measuring relay, the characteristic quantity of which is current
Note: The respective operation is defined by one of the four terms "over… relay", "under… relay", "under and over… relay", and "rate of change of… relay".
447-01-28
voltage relay
measuring relay, the characteristic quantity of which is voltage
Note: The respective operation is defined by one of the four terms "over… relay", "under… relay", "under and over… relay", and "rate of change of… relay".
447-01-29
frequency relay
measuring relay, the characteristic quantity of which is frequency
Note: The respective operation is defined by one of the four terms "over… relay", "under… relay", "under and over… relay", and "rate of change of… relay".
