Relay Protection Test

Protective relay (Relay Protection) is an electromechanical apparatus, often with more than one coil, designed to calculate operating conditions on an electrical circuit and trip circuit breakers when a fault is detected (wikipedia). 

ANSI Code for Protection

 

CURRENT PROTECTION FUNCTIONS

• ANSI 50/51 – Phase overcurrent

• ANSI 50N/51N or 50G/51G – Earth fault or sensitive earth fault

• ANSI 50BF – Breaker failure

• ANSI 46 -Negative sequence / unbalance

• ANSI 49RMS – Thermal overload

 

DIRECTIONAL POWER PROTECTION FUNCTIONS

• ANSI 32P – Directional active overpower

• ANSI 32Q/40 – Directional reactive overpower

 

VOLTAGE PROTECTION FUNCTIONS

• ANSI 27D – Positive sequence undervoltage

• ANSI 27R – Remanent undervoltage

• ANSI 27 – Phase-to-phase undervoltage

• ANSI 59 – Phase-to-phase overvoltage

• ANSI 59N – Neutral voltage displacement

• ANSI 47 – Negative sequence voltage

 

RECLOSER

• ANSI 79 – Reclose the circuit breaker after tripping

 

DIRECTIONAL CURRENT PROTECTION

• ANSI 67 – Directional phase overcurrent

• ANSI 67N/67NC – Directional earth fault

• ANSI 67N/67NC type 1

• ANSI 67N/67NC type 2

• ANSI 67N/67NC type 3

 

MACHINE PROTECTION FUNCTIONS

• ANSI 37 – Phase undercurrent

• ANSI 48/51LR/14 – Locked rotor / excessive starting time

• ANSI 66 – Starts per hour

• ANSI 50V/51V – Voltage-restrained overcurrent

• ANSI 26/63 – Thermostat, Buchholz, gas, pressure, temperature detection

• ANSI 38/49T – Temperature monitoring by RTD

 

FREQUENCY PROTECTION FUNCTIONS

• ANSI 81H – Overfrequency

• ANSI 81L – Underfrequency

• ANSI 81R – Rate of change of frequency (ROCOF)

 

Relay protection test! Prevent your electrical distribution systems and those supply before failure.

 

  

MDE team experienced in testing of protective relay. Some of the equipment we tested are, SEPAM, GE Multilin, MICOM, SIPROTECT, SPAJ and many more. 

We offer test for protective relay by contract schedule and one shoot testing.

Please contact us for Inquiry.