Low power generator protection relay
Protection relay of low-power generator, dedicated to be used as additional generator protection in distributed generation systems. The device integrates protection functions as well as control functions, measuring and recording.

Manuals, diagrams, technical details


Product description

Protection set

81L/81H Under- and overfrequency, two-stages
81S Rate of change of frequency (ROCOF) by frequency derivative
81SA Rate of change of frequency (ROCOF) by average frequency change
59/27 Under- and overvoltage
27S/59S Rate of change of voltage by voltage derivative
27SA Rate of change of voltage by average voltage change
50/51 Overcurrent, two-stages
32R Reverse power protection
32S Rate of change of power (ROCOP)
ΔΘu Voltage vector shift protection (VVS)
59N Residual overvoltage
62 External protection

Main features

  • 4 measuring inputs: A type: 3xU, I; B type: 3xU, U0
  • 4 settings banks
  • measurment of analog input values
  • real time clock
  • event recorder with capacity up to 500 records
  • last disturbance parameters recorder
  • samples or magnitudes of disturbance and logic states recorder
  • Tripped currents counter
  • Two binary inputs for cooperation with external protection purposes, possibility to be used as blocking inputs
  • Trip impulse
  • alphanumeric LCD display (2×16) and six buttons enabling operation of the relay
  • visual indication (by LED diodes) of pick-ups and trips, exceeding of counters or proper operation of relay
  • 7 programmable relay outputs (S1-S7)
  • RS-485 port for communication with PC computer or supervision and control system (MODBUS-RTU protocol)
  • self-test system of proper operation of relay control
  • enclosure construction enables three types of mounting: 35 mm rail, surface mount or flush mount

Exceeding of any set threshold value causes the reaction of the relay according to the configuration. Communication interface provides measured and calculated electrical values, binary inputs and outputs states and saved records. The manufacturer provides PC software allowing to set the relay, confirm signals, graphical display of measured values and browse records.



Rated measuring voltage Un 100V
Rated measuring voltage Un0 100V (B version)
Rated measuring current 5A (A version)
Rated frequency 50Hz
Auxilliary voltage Upn 24V DC, od 48V do 60V DC,
110V DC/AC, 230V DC/AC
Control voltage acc. to aux voltage
Setting range of voltage threshold value Ur = (0,05÷1,2)Un
Setting range of frequency threshold value (40,2 ÷ 65,0)Hz
Setting range of frequency derivative threshold value (-1,00 ÷ -0,01)1/s albo (0,01 ÷ 1,00)1/s
Setting range of voltage change in time threshold value -(0.01÷0,9)
Setting range of current threshold value (0 ÷ 3,00)In
Setting range of reverse power threshold value (0,000 ÷ 1,200)Pn
Setting range of reverse power derivative threshold value (0,005 ÷ 0,900)Pn

Setting range of angle threshold value

of vector shift protection

20 ÷ 320
Setting range of operating time (0,00 ÷ 99,99)s

Relay response time:

27/47/59/32R/∆Θu  protection functions

Relay response time – 59N protection function ≤100ms
Relay response time – 81L/81H protection functions ≤100/120ms
Accuracy of voltage inputs 0,5% for U=Un
Accuracy of current inputs 1% for I=In
Accuracy of frequency measuring ± 0,01Hz
Accuracy of power measuring 2,5%
Accuracy of time measuring 1% ± 10ms
Burden in measuring inputs ≤0,5VA/input
Burden of supply module ≤5W
Current inputs withstand thermal(1s)/dynamic 80In/250In
Voltage inputs withstand continuous/thermal (10s) 1,2 ΘUn/1,44 ΘUn
Relay outputs data:
Max. breaking capacity by 250V DC
– resistive load 0,3A
– inductive load of L/R ≤40ms 0,1A
Max. breaking capacity by 250V, 50Hz
– inductive load, cosϕ=0,4 3A
Continuous contact carry 6A
Ambient temperature (253÷328)K/(-20÷55)°C
Relative humidity do 80%
Ingress Protection degree IP40
Weight ok. 0,8kg
Dimensions (height x width x depth) 75 x 100 x 120 mm
Electromagnetic compatibility acc. to EN 60255-26
Insulation according to EN 60255-27

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