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LOSS OF MAINS RELAYS: G59/3 Amendment 4 and G83/2 compliant - Model UFR1001E

Please note that Distribution Code Issue 32 has been published.

This version of the Code has been revised as a result of modifications to annex 1 qualifying standards Engineering Recommendations (EREC) G59 and G83. G59/3-3 has been modified and is now referenced as G59 issue 3 Amendment 4, and G83/2 has been modified and is now referenced as G83 issue 2 Amendment 1.

The modifications made to EREC G59 and EREC G83 mandate that all type tested generators, commissioned on or after 1 July 2018, shall demonstrate stability for appropriate RoCoF and vector shift disturbances. These are:

  • That the rate of change of frequency (RoCoF) criterion used for Loss of Mains protection must be 1Hzs-1 with a definite time delay of 500ms.
  • That vector shift protection technique should not be used as Loss of Mains protection for generators using discrete relays as part of loss of mains protection scheme and that the generation must not trip for vector shifts of up to 50º.
  • That type-tested generation includes stability tests to prove immunity to RoCoF and vector shift less than the above criteria.

A minor update to the Code’s Guidance Note 2 has also been made to reflect this change.

PLEASE NOTE: Although Distribution Code Issue 32 has been published it will not become effective until 1 July 2018. It has been published so manufacturers are aware of the required modifications to G83 and G59 in advance of the date of effect

Copies of the revised Distribution Code, EREC G83/2-1 and EREC G59/3-4 and the Authority decision letter can be found and downloaded from the DCode website home page by using the following link -

The UFR1001E system-disconnection relay monitors voltage and frequency in single or three-phase networks. It complies with the conditions and all the requirements of G59/3 and G83/2-protection, for feeding into the low voltage grid and for feeding into the medium voltage grid. When using with generators, the evaluation of feedback contacts for the period of a shut-down and during the synchronisation can be suppressed.

The UFR1001E has two channels which makes it more fail-safe; input circuitry, evaluation and output relay are provided in duplicate. Two processors monitor each other mutually. Feedback contacts are used to monitor the functioning of both output relays and the section switch. During an alarm both channels shut down, the cause is displayed and it is reported through digital outputs, seperate DC power supply required.

LOSS OF MAINS RELAYS: G59/3-3 2018 and G83/2 compliant - Model UFR1001E

Summary of the functions

Applications include monitoring the network in generating plants, such as solar arrays, wind turbines, CHP Installations and diesel generator connected to the mains for Co-generation or peak loppping applications. Offering U/O Voltage and Frequencey, as well as Vector shift and ROCOF the UFR1001E suits all installation types. The device complies with the requirements of the public utility power providers for conventional protection in low and medium voltage systems >30 kVA.

  • Presetting per G59/3, G83/2, VDE-AR-N 4105, BDEW, ÖVE/ÖNORM E 8001-4-712
  • Under and overvoltage monitoring 40…520 V
  • Measurement 3 / 2 / 1 phases against N and/or phase-phase
  • Under and over frequency monitoring 45…65 Hz
  • Monitoring the voltage quality (10 minute average value)
  • Vector-surge monitoring 2…20° connectible
  • Fail-safe, with monitoring of the connected section switch (can be switched off), 2 automatic restarts on error
  • Passive autonomous system detection in accordance with Chapter 6.5.3 and Appendix D2
  • Monitoring of Rate of Change of Frequency (ROCOF, df/dt) connectible
  • Supports the mains synchronisation when using generators
  • Self-test
  • Response time adjustable 0.05 … 130.0 s, individual setting for each limit
  • Reset time adjustable 0 … 999 s, individual setting for each limit
  • Reset time 5s at limit violation < 3s
  • Alarm counter for 100 alarms (with trip value, cause and rel. time stamp)
  • Record of the cumulative time of alarms
  • Standby input with counter and time memory
  • Test button, simulation function, measurement of the shut-down times
  • LEDs for alarm signals, measurement value allocation and relay status
  • Sealing facility and code protection for settings, values can also be read in the sealed state
  • Simple commissioning and programming through 6 basic programs with preset limits
  • Message outputs for general alarm and for forwarding the cause of switching to the upstream controller (transistor, max. DC 27 V, 20 mA)

Medium voltage

  • Per 2x2 limits for voltage and frequency: U<<, U<, U>, U>>, F<<, F<, F>, F>>
  • Hysteresis, response and reset value individually adjustable
  • Control voltage AC/DC 24-270 V
  • Distributor housing V6, 6 TE 105 mm wide, front-to-back size 55 mm
Datasheet g59 g58 Great Britain: G83/2:2012 g59 g58
Operating Manual g59 g58 Great Britain: G59/3:2013 g59 g58
Quick Guide - Box Manual g59 g58 Ireland EN 50438
Irish compliance for micro generation
g59 g58



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