Versatile voltage protection
Versatile voltage protection relay dedicated to be used in power protection systems in order to protect power equipment against abnormal voltage conditions and to be used in voltage-based load shedding systems. The device integrates protection functions as well as control functions, measuring and recorders.

Manuals, diagrams, technical details


Product description

Protection set

27/59 Under-/overvoltage, definite-time, three-stages, three-phase (OR/AND operation mode)
59N Residual overvoltage, three-stages
47 Negative-sequence overvoltage, two-stages
27D Positive-sequence overvoltage, two-stages
27S/59S Rate of change of voltage by voltage derivative
27SA Rate of change of voltage by average voltage change
27I/59I Voltage integral based
62 External protections

Main features

  • 4 measuring inputs (Un=100V) or 3 measuring inputs ((Un=400V)
  • different types and versions depending on configuration
  • 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

The energizing values are input voltages: UL1, UL2, UL3 and U0 if Un=100V or UL1, UL2, UL3 if Un=100V. On the basis of measured voltages other energizing values are calculated: positive-sequence voltage U1, negative-sequence voltage U2, derivative of voltage, rate of change of voltage, integral of voltage. 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 frequency fn 50Hz
Auxilliary voltage 24V DC, 48V – 60V DC,
110V DC/AC, 230V DC/AC
Control voltage acc. to aux voltage
Setting ranges of protections treshold values: Ur = (0,05÷1,2)Un for „27 / 27D / 47 / 59 / 59N”
dUr = (-1,00÷-0,01)1/s or (0,01÷1,00)1/s for „(27S / 59S)”
DUr = (-0,100÷-0,003)1/s or (0,003÷0,100)1/s for „(27SA / 59SA)”
CUr = (0,01÷2,00) for „27I / 59I”
Setting range of timer (0÷99,9)s
Pick-up time for „27 / 27D / 47 / 59” ≤40ms
Pick-up time for „59N / 27S / 59S” ≤100ms
Pick-up time for „27SA / 59SA / 27I / 59I” ≤(1,00 ÷ 30,00)s + 40ms
Accuracy of voltage measuring δ ≤0,5% for U=(0,7 ÷ 1,3)Un
δ ≤1% for U=(0,3 ÷ 0,7)Un
δ ≤2,5% for U=(0,05 ÷ 0,3)Un
δ ≤5% in the rest of measuring range
Accuracy of time measuring ± 10ms
Burden in measuring inputs ≤0,5VA/input if U=Un
Burden of supply module ≤5W
Continuous measured voltage  1,2Un (1,2Uon)
Thermal withstand (10s) 1,44Un (1,44Uon)
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 ≤80%
Ingress Protection degree IP40
Weight ~ 0,7kg
Dimensions (height  x width x depth) 75 x 100 x 120 mm
Electromagnetic compatibility acc. to EN 60255-26
Insulation according to PN-EN 60255-5

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