What is ANSI designation?
What is ANSI designation?
American National Standards Institute codes (ANSI codes) are standardized numeric or alphabetic codes issued by the American National Standards Institute (ANSI) to ensure uniform identification of geographic entities through all federal government agencies.
What is a 49 relay?
49 Machine or transformer thermal relay A relay that functions when the temperature of a machine armature winding or other load-carrying winding or element of a machine or power transformer exceeds a predetermined value.
What is a 32 relay?
The Type 32 relay is a device with overcurrent monitoring that can be used with a negative or positive conductor for a DC power distribution network. The main function of this detector is to continue monitoring low power levels and to pick up reverse feed currents.
What is a 21 relay?
The goal of a distance relay (ANSI/IEEE code 21) is to trip its circuit breaker(s) if a fault occurs within its programmed “reach” and to ignore both normal operating loads and faults lying outside its reach.
What is a 50 relay?
On electromechanical relays, the 50 function can be added as an instantaneous attachment to a 51 time-overcurrent relay. If a relay has both 50 and 51 functions present and enabled is referred to as a 50/51 relay. This relay is referred to as a residual ground overcurrent or 51N (or 50/51N) relay.
What is 50N relay?
50N is a ground protection consisting of a set of residual-connected CTs. This protection is obtained by connecting three independent CTs in residual connection to the protection relay 50N. This means that you are saving money by using the Phase protection CTs to obtain a further ground protection.
What is a 51 relay?
The phase relays are designated 51 and the residual ground overcurrent relay is designated 51N (both without instantaneous function). The dotted line from the relays to the circuit breaker denotes that the relays are wired to trip the circuit breaker on an overcurrent condition.
What is DC supervision relay?
This type of relay is used to supervise the DC supply. The relay coil terminals 1 & 2 are connected to the DC supply, which is to be monitored. In case, the DC auxiliary supply is available, the relay’s ‘NO’ contact closes and healthy status is indicated through ‘WHITE’ flag.
