Ground fault protection relay
Ground fault protection RioK-442 is dedicated to HV system with solidly earth neutral point. The relay intended to detect line-to-earth short-circuits. Digital technology ensures high accuracy, stability and dependability.

Manuals, diagrams, technical details


Product description

Protection set

51N definite-time ground overcurrent protection, two stages
67N directional ground overcurrent protection

Main features

  • three possible modes of fault detecting: overcurrent, overcurrent with voltage restrain, directional overcurrent, settable undependent for each stage
  • definite-time charateristic with one or two settable time delays or inverse time characteristic
  • measurment of current electrical values (current, voltage, phase shift of current and voltage)
  • event recorder: 20 unique events with capability of 300 events, time resolution 1 ms
  • parameters of last disturbance recorder
  • 2 binary inputs in order to block protection pick-up or auto-reclose function
  • 5 programmable relay outputs (S1-S5)
  • optical indicating (with LED diodes) of relay operation statuses
  • watchdog contact
  • test of relay outputs option
  • self test of proper operation of relay
  • real time clock
  • communication RS-485 port for connectrion with PC computer or SCADA system (optional)
  • relay enclosure gives possibility to mount on 35 mm rail, surface mount or flush mount

Energising values of RioK-442 protection relay are zero-sequence component of currents (3Io) and zero-sequence component of voltages (3Uo). The relay reacts if any of measured values exceeds the threshold value set by the user. 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 or 110V or 125V
Rated measuring current In 1A or 5A
Rated frequency fn 50Hz
Auxilliary voltage 24V DC
or (48 ÷ 60)V DC
or (110 ÷ 230)V AC/DC
Control voltage acc. to aux voltage
Burden in current input for I=In ≤0,5VA
Burden in voltage input for U=Un ≤0,5VA
Burden in binary inputs ≤0,5 W /input
Burden in auxilliary voltage supply ≤6W
Continous thermal withstand
of current input 2,2 In
of voltage input 1,2 Un
Thermal withstand
of current input (1s) 80 In
of voltage input (10s) 1,4 Un
Dynamic withstand of current input 200 In
Relay outputs data (S2 – S5)
– breaking power capacity in AC1 cat. <2000VA
– braking capacity by inductive load (L/R≤40ms) 0,12A/250V DC
Continuous contact carry 5A
Relay outputs data (S1, OK)
– breaking power capacity in AC1 cat. 1500VA
– breaking capacity by DC1 load: 28/220V 6/0,16A
Continuous contact carry 5A
Relay pick-up time <40ms
Reset time <60ms
Setting range of timer:
– definite-time characteristic (0,00 ÷ 9,99)s
– inverse-time characteristic A, B, C acc. to PN-EN60255-3
(or any set by the user)
Setting range of treshold current (0,00 ÷ 30,00)In by step of 0,01In
Setting range of treshold voltage (0,00 ÷ 1,00)Un by step of 0,01Un
Setting range of characteristic angle (0 ÷ 90)° by step of 1° (ind.)
Accuracy of current and voltage measuring input  ±2,5%
Accuracy of angle measurement ±5°
Ambient temperature range (normal env. conditions) (268 ÷ 313)K/(-5 ÷ +40)°C
Ambient temperature range (special env. conditions) (263 ÷ 328)K/(-10 ÷ +55)°C
Relative humidity (normal env. conditions) ≤80%
Relative humidity (special env. conditions) ≤93%
Ingress Protection degree IP40
Weight 0,8kg
Dimensions (width x height x depth) 75 x 100 x 120 mm
Electromagnetic compatibility according to PN-EN 50263
Insulation according to PN-EN 60255-5

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