Protection set

Depending on type of relay, different set of protection functions from the list below are implemented:

50/51                    Instantonous and definite-time overcurrent protection against phase-to-phase faults

51                           Definite-time or inverse time overcurrent protection

51/67                    instanteneous or definite-time dedicated for long lines against phase-to-phase faults, with directional interlocking in CZAZ-L+ (67)

51/67                    overcurrent against phase-to-phase faults with two possible operation modes:

– definite-time overcurrent with directrional interlocking

– inverse-time overcurrent

51N/27                 inverse-time overcurrent against ground faults with option of interlocking by residual undervoltage

51N/67N             against ground fault with option to choose one of the following operation modes:

– two-stages overcurrent (51N)

– inverse-time overcurrent (51N)

– directional overcurrent (67N)

– admittance-based directional protection

50N/51N             ground overcurrent, definite-time, two-stages

51N                       ground overcurrent, inverse-time

21N                       admittance-based against ground faults protection

67N                       directional ground overcurrent

59N                       ground overvoltage

27                           undervoltage, definite-time, two-stages

59                           overvoltage

81                           overfrequency

62                           external

79                           auto-reclose automation

Arc Flash Detector (optionally)

coordination with UFLS and AR after UFLS automation

coordination with transformer Bulcholtz protection

Main features

• bay controller with standard control operation mode implemented which ensures safe in both local and remote modes based on breakers position supervisingAdditional functions:- busbars protection

  – CB failure function

  – cooperation with ATS function

  – Switch Onto Fault function

  – cooperation with station failure/alarm signalling system

  Cooperation with breakers function ensures:

  – supervising of CB postition

  – Trip Circuits Supervising functions

  – Open command and Close command

  – Disconnector and Earthing switch postion supervising

  Up to 24 binary inputs and 10 relay outputs in order to fullfil functions listed above.

  – 8 programmable relay outputs

  – 5 binary inputs for cooperation with external protections

  – 2 TRIP purposes relay outputs allowing to direct connection with CB coils and with Trip Circuit Supervision function

  – 7 measuring inputs (phase currents, phase-to-phase voltages, residual current/voltage)

  – Measuring of current electrical vaules (phase currents, zero-sequence current, phase-to-phase voltages, active power, reactive power, active energy counter, power factor)

  – Event and disturbances recorders

  – ab. 70 unique events register with capacity to memorise up to 500 events

  – disturbance recorder of sampling frequency 1000 Hz (7 analog signals and 16 binary signals)

  – parameters of last disturbance recorder: maximum current during disturbance and duration of disturbance

  – number of protection operations counter and sum of tripped current counter

  – optical visualisation of most important states of protected object (8 LED diodes)

  – autotest and autocontrol system

  – screw terminals for current inputs and pluggable screwless terminals for other circuits

  – autonomic communication by local Human Machine Interface

  – remote communication with PC computer or supervising system