• Delivery RETOM-51in stock
  • Warranty 5 years
  • Price on-demand

RETOM-51 (РЕТОМ-51) – power in your hands!

Reliability of relay protection equipment is mostly determined by quality of its performance check both in debugging and in field operation. These checks are carried out on a regular basis using specific tools generating currents and voltages necessary to diagnose Relay Protection and Automation equipment.

As utilities have a great number of relay units their testing requires significant expenditure and high skilled personnel. Test system based on RETOM-51 instrument would be of great help to cope with this problem.


  • universal three-phase current and voltage source providing that each parameter can be amplitude and phase controlled,
  • test system for relay protection and automation testing under debugging and commissioning, followed by test protocol,
  • universal wide range current, voltage and frequency measuring tool.


  • automated testing and adjustment of all generation relay protection and automation devices,
  • up-to-date microprocessor-based relay and complicated home and foreign protection systems,
  • solid-state relay protection and automation systems,
  • whole range of relay protection and automation electromechanical panels and sets,
  • home and foreign fault locators,
  • emergency control panels and remote measurement circuits,
  • synchronizing devices,
  • watthour meters,
  • generator excitation system,
  • railway protection systems.

Main advantages:

  • free standard multifunctional software package allows easy and quick manual and semiautomatic (special package for automatic) test of any relay and protection,
  • joint operation with RETOM-CVHM set allows full test of phase differential protection subset,
  • using RET-GPS units it is possible to arrange synchronized operation of remote two sets providing unique opportunity to end-to-end test of differential phase protection subsets,
  • wide range built-in intelligent device provides high safety as of the instrument as the equipment under test,
  • in case of disturbance all output signals are tripped and testing procedure is suspended until troubleshooting. This considerably improves safety work and accuracy of the results,
  • reliable operation in a wide network range,
  • user-friendly and well-familiar Windows interface,
  • the open control architecture of RETOM-51 ensures quick and simple development of individual testing programs,
  • a solid and a good-looking case, considerably more resistant to mechanical influence,

Delivery set

The testing system RETOM-51 operates under control of PC and includes the following:

  • testing device RETOM-51,
  • standard software with the following modules included:
    • manual control of current and voltage sources,
    • current relay testing,
    • voltage relay testing o power relay testing,
    • impedance relay testing,
    • frequency relay testing,
    • universal stopwatch-recorder,
    • power system model,
  • accessories,
  • related documentation.

On customer's request, the following can be additionally included into the delivery set:

  • special programs for automated testing of relays of different types and complete protection sets,
  • three-phase voltage converter unit RET-TN,
  • single-phase current converter unit RET-10.
Number, pcs 3
Current change range
  • three-phase mode
  • single-phase mode
  • DC source mode

36 A (700 VA)
108 A (1400 VA)
Min. current change step, mA 1,0
Max. output voltage, V, min 34
Range of permissible relative error of AC value reproduction, % ** ± (0,004X + 0,00004Xk)
Range of permissible relative error of DC value reproduction, % ** ± (0,005X + 0,00001Xk)
Operating voltage for overvoltage protection, V 22
Number, pcs 4
Voltage change range, V  
- three-phase mode 135 V
- single-phase mode 405 V
- DC voltage source mode 380 V
Min. voltage change step, mV 10
Max. output capacity of every source with Uoutput 60 V, VA, min. 60
Range of permissible relative error of DC and AC voltage,% ** ± (0,004X + 0,00004Xk)

Operating voltage for short circuit protection, V

- output voltage less than 60 V

- output voltage more than 60 V




Reproducible frequency range for current source, Hz 1 - 1000
Reproducible frequency range for voltage source, Hz 1 - 2100
Min.step of frequeucy change, Hz 0,001
Range of permissible absolute error of frequency reproduction within 45...65 Hz, Hz ** ± 0,0002
Range of permissible absolute error of frequency reproduction within other ranges, Hz ** ± 0,01
Ratio of non-linear distortions of mains frequency (50 Hz) sinusoidal signal, %, max. 1,5
Range of current and voltage phase shift change with mains frequency (50 Hz), Ў 0 - 359,999
Min.step of phase shift change, ° 0,001
Range of permissible absolute error of phase shift setting for current and voltage channels (within 5...100% of signal amplitude reproduction range), ° ** ± 0,3
Time measurement range, s 0,001 - 99 999
Range of permissible relative error of time measurement, % ** ± 0,1

Output voltage range, V

130 - 264

Output current, A


Max. output power, W


Peak-to-peak ripple in 0 - 20 MHz frequency range at 220V output voltage and max. output power, %, max

± 1


Nr. of inputs, pcs

2 (isolated)

Voltage measurement limits, V

0.5-5 5-50

Voltage measurement permissible absolute error limits, V **

±(0.005X + 0,0001Xk)

Measured voltage min. permissible value, % of the limit


Integrated voltmeter input resistance, k Ω, min.


Nr. of inputs, pcs

16 (isolated)


"dry contact", transistor switch, TTL 15 V

Max. DC input voltage, V


Input state reading uncertainty time, ms


Input status change detection resolution, ms, max



Nr. of inputs, pcs


Type Transistor Relay  

Making capacity at resistive load:

- DC current value, A

- DC voltage value, V







Making capacity at resistive load:

- AC current value, A

- AC voltage value, V







Operate/reset time, ms

2 20
Galvanic separation of supply circuits relatively to the rack, V 1500
Galvanic separation of current-carrying parts (except for analog inputs) relatively to the rack/mains cord, V 1500
Galvanic separation of analog inputs relatively to the rack/mains cord, V 2200

Operating time of source thermal protection:

with max.output power from cold state, 20 °C, min, min.

- with 10 % of max. output power




Testing device power supply:

- single-phase mains, V

- supply mains frequency, Hz

- power consumption, VA, max.


220 - 22 (+44)

48 - 51


Mass, kg, max. 19
Overall dimensions (without handle), mm, max. 510 х 180 х 475
Operating ambient temperature range, °С 5 - 40
Relative humidity with 25 °C, %, max. 80
Altitude above sea level, m, max. 2000
Group of operating conditions according to GOST 17516.1 М23

Protection degree according to GOST 14254:

- case

- output terminals




Safety requirements Class I GOST P 51350
Mean service life time, years, max. 30
Mean time between failures, hours, min. 10000
Mean recovery time with consideration of fault detection time, hours, max. 3


1 The range, within which the source metrological characteristics are normalized, is underlined
2 The following designations are accepted:
Xk - final value of corresponding magnitude measurement range
x - measured value of corresponding magnitude

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