RES-3 digital recorders are intended to measure the current, voltage, phase shift, capacity, capacity factor and frequency in single- and three-phase power networks at certain times and to record the measured values during normal operation and in emergency situations («Electrical events» registration) in the power facilities’ hardware.

The recorder can be used in automated systems for measuring, monitoring, signaling and control of power facilities of power suppliers or power consumers. RES-3 is a project-based, software-configurable, modular, IBM-, PC-compatible industrial controller equipped with analog and binary signals I/O modules and communication modules.
RES-3 effects real-time measurements, acquisition, processing, archiving, presentation and transmission of measurement data to the control engineer`s computer.

Main functions

  • Recording of oscillograms of actual normal operation and emergency modes (fault recording system)
  • Registration of binary signals of relay protection and automation
  • Registration of the emergency mode is initiated automatically by any of the following reasons
    • deviation of any analog channel`s signal in any direction from the set point;
    • deviation in any direction from the set point of the computed signal (frequency, capacity, impedance, positive-, reverse-, or zero-sequence currents);
    • triggering of any binary signal channel;
    • simultaneous triggering of several binary signal channels according to the «AND» logic;
  • Processing of information in real time, loop recording of information onto media with protection against selective deletion
  • Elaboration of vector diagrams in real-time mode
  • Calculation of active, reactive and total capacities, symmetrical components of currents and voltages, frequency
  • Calculation of line impedance
  • Built-in software and hardware self-diagnostics
  • Keeping of daily archives of averaged measured and computed values
  • Displaying or printing out of information with a clear time reference
  • Data exchange with external devices, transmission of information to a processing (control) center
  • Transmission of emergency oscillograph records to a memory stick via a USB port
  • Transmission of data to the APCS system:
    • under OPC DA protocol,
    • under IEC 60870-5-104 protocol,
    • under IEC 61850-8-1 (MMS) protocol,
    • under C37.118.1-2011 protocol (WAMS, Phasor measurements);
  • Automatic conversion of emergency event oscillograph records into the COMTRADE format


  • High sampling frequency
  • High accuracy of measurement of analog signals
  • Flexible communication system (communication with the control engineer`s computer can be effected over the Ethernet interface, standard telephone modem, GSM modem, or XDSL modem)
  • Mean time between failures – 150 000 hours
  • Average service life – 25 years
  • High reliability
  • Wide range of options for changing the configuration, functions, parameters, and settings
  • Capability of being integrating into an ACS system according to standard protocols
  • Availability of a web interface.

Basic performance data

number of analog input channels*

2 - 64

number of binary signal input channels*


ADC digit capacity


sampling frequency for each channel

  • 16 channels up to 8 (160 samples/cycle) kHz
  • 32 channels up to 4 (80 samples/cycle) kHz
  • 64 channels up to 2 (40 samples/cycle) kHz

main full scale accuracy of analog signals’ registration

up to 0.4%

fault mode registration period

up to 1 h

pre-emergency mode registration period

0.1...600 s

maximum recorded current

200 А

maximum recorded voltage

1000 V

overall dimensions of the electronics block

196х170х287 mm

overall dimensions of the terminal connections block

500х200х120 mm

overall dimensions of the RES-3 cabinet (WхHхD)

  • 810x2260x630 mm**
  • 610x2260x630 mm**
  • 1210x2260x630 mm***

Design and operation concept

RES-3 comprises an electronics unit and one or several terminal connections units.

The terminal connections unit integrates 2-channel analog input normalization modules and 24-channel galvanic decoupling boards for binary signals. Fast replacement of input analog modules is enabled. The electronics block ensures conversion of analog signals to digital format and their subsequent processing in accordance with the preloaded program. The recorded signals sampling frequency is defined by the user. The limiting value of this parameter is in inverse proportion to the number
of analog channels used. For a recorder with sixteen analog channels the sampling frequency amounts to 8 kHz (160 samples per 50 Hz frequency cycle).

RES-3 has independent means of displaying emergency processes as part of the relay engineer`s workstation, with data being sent to the workstation via a local network or a modem. With the help of RES-3 any electromagnetic transients associated with
short-circuits and operation of relay protection and SIPS devices (currents, voltages, binary signals on operation of relay protection and SIPS, status of breakers). It is also possible to start recording the oscillograms both in the case of setpoints being exceeding, or when a signal from external devices («dry» relay contacts or potential signal) is received.

When working with the REC-3 recorder it is necessary to define both the total duration of oscillograph records and the duration of the pre-emergency, emergency and post-emergency modes, as well as the number of records stored about a series of accidents occurring in succession.

The moment of the beginning of the accident is registered across the entire set of signals (analog or binary). Registered results are transmitted to the upper level of centralized system (automatically or when ordered by the operator) for further archiving, as well as for data presentation and retrospective analysis by means of the relay engineer`s workstation. The equipment allows to save and transmit the oscillograph records in the COMTRADE format to higher levels of system control and process control, as well as to analyze the oscillograph records according to spectral and harmonic components. Activation of RES-3 for registration of an emergency mode is effected automatically.

Setpoints are defined by the user on any channel or combination of channels for system control signals from the control engineer program and are saved when the device is turned off.

Constant recording of emergency modeparameters into the device`s memory allows to register any duration of pre-fault conditions up to the entire accident duration.

Currently there are over 2000 RES-3 devices in operation.

* For a fixed version.
** For cabinet and fixed versions.
*** Unilateral maintenance cabinets.


  • Cabinet version
  • Portable version
  • Fixed version (mounted on a wireframe panel)


RES-3 Software consists of an oscillograph application that runs on the device, and the SignW system control program installed on the control engineer`s computer (workstation)

Oscillograph application

  • Real time operation
  • Processing of setpoints according to channels
  • Emergency event recording and archiving
  • Transmission of recorded event to the upper level
  • Data exchange with the control engineer

SignW control engineer application

  • Standard Windows-type interface
  • Remote configuring of the oscillograph
  • Viewing of alarm records and current statuses in oscillogram format
  • Viewing of archived records in a daily graph format
  • Elaboration of vector diagrams of line signals
  • Calculation of distance to the location of the line`s fault
  • Printing out of oscillograph records on a color or b/w printer
  • Management of level of rights of access to the RES-3 settings
International users group UCA

Сertificate №10157892-INC 19-2545Rev1

The digital substation fault recorder, RES-3-61850, produced by Prosoft-Systems, has received a certificate for its conformity with the IEC 61850 Level A standard. This document, issued by the international users group UCA, confirms that, according to test results, the device meets the requirements given in the second revision of this international standard.