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Motor Protection


Motor protection microprocessor relays for motors 0,4 kV
in Networks with Insulated Neutral
RDC-01-053, RDC-01-203


RDC-01-053, RDC-01-203 - motor protection microprocessor relay
RDC-01-053

The relays of engine protection RDC-01-053, RDC-01-203 (with digital control and indication of controlled parameters) are intended for protection of three-phase asynchronous electric motors of 3х380 V 50 Hz with direct connection by the power (0,55...2,2) kW (RDC-01-053), (2,2...9,0) kW (RDC-01-203) and with connection via measuring transformers of current with the power (9,0...450) kW (RDC-01-053).

Relays carry out protection of the electric motor against consequences (protective functions of the relays):

  • overloading;
  • asymmetry of loading;
  • underrunning;
  • supply overvoltage;
  • supply undervoltage;
  • wrong phase rotation;
  • decrease of the isolation resistance of engine windings before start-up and circuit switching at reaching of one of controlled parameters of the programmed level.

Service functions of the relays:

  • possibility of monitoring of the following parameters:
       - consumption current on each phase (IA, IB, IC);
       - voltage in electric network on each phase (UA, UB, UC);
       - network frequency;
       - motor-meter;
       - anomalies in networks and the reasons of critical conditions.
  • the adjusted number of automatic start-ups after emergency shutdown (up to five start-ups with time interval between repeated start-ups - 15 s);
  • protection of the adjusted settings against unauthorized access (password);
  • possibility of removal of the kept accident parameters without device shutdown.


Motor protection microprocessor relays for motors 0,4 kV
RDC-01-055, RDC-01-205


RDC-01-055, RDC-01-205 - motor protection microprocessor relay
RDC-01-055

The relays of engine protection RDC-01-055, RDC-01-205 (with digital control and indication of controlled parameters) are intended for protection of three-phase asynchronous electric motors of 3х380 V 50 Hz with direct connection by the power (0,55...2,2) kW (RDC-01-055), (2,2...9,0) kW (RDC-01-205) and with connection via measuring transformers of current with the power (9,0...450) kW (RDC-01-055).

Relays carry out protection of the electric motor against consequences:

  • overcurrent conditions;
  • rotor blocking;
  • asymmetry of loading;
  • underrunning;
  • supply overvoltage;
  • supply undervoltage;
  • short-circuit (current cutoff);
  • return phase rotation;
  • decrase of the isolation resistance of engine windings before start-up.

The relays carry out circuit switching at reaching of one of controlled parameters of the programmed level.

The relays have an opportunity to turn off action of the following functions:

  • protection against the maximum voltage;
  • protection against the minimum voltage;
  • protection against the no-load/dry course;
  • protection against an asymmetry of current;
  • current cutoff;
  • protection against the rotor blocking;
  • protection against the wrong phase rotation;
  • protection against the isolation resistance.

The relays can be used for work in one of two modes:

  1. current control in phases А, В и С;
  2. current control in phases А и С.

At the same time, except protective functions, the relays have the possibility of monitoring of the following parameters:

  • current consumption in each phase (IA, IB, IC);
  • network voltage in each phase (UA, UB, UC);
  • the isolation resistance before the motor start-up;
  • network frequency;
  • motor-meter.


Protection microprocessor relays for motors 0,4 – 6/10 kV
RDC-01-057


RDC-01-057 - protection relays for motors 0,4 – 6/10 kV
RDC-01-057

The relays of engine protection RDC-01-057 (with digital control and indication of controlled parameters) are intended for the protection of asynchronous electric motors with voltage 0,4 kV (RDC-01-057-1, RDC-01-057-2, RDC-01-057-3), and also high-voltage electric motors 6/10 кV (RDC-01-057-4, RDC-01-057-5).

The relays have the following types of protection against consequences:

  • short circuit (current cutoff) (RDC-01-057-4, RDC-01-057-5);
  • overcurrent conditions;
  • asymmetry of loading (phases А and С or phases А, В and С);
  • underrunning (in phases А and С or in phases А, В and С);
  • rotor blocking;
  • single-phase-to-ground short circuit at the zero sequence current;
  • excess of the supply voltage of the motor;
  • decrease of the supply voltage of the motor;
  • wrong phase rotation;
  • sticking of the motor starter contacts (RDC-01-057-1, RDC-01-057-2, RDC-01-057-3).

Model Operational power
supply of the relay
Control of linear
supply voltages of
the motor
Control of the motor current
RDC-01-057-1 Single-phase, AC/DC
100, 110, 220 V, 50 Hz
no In phases А and С, zero sequence current control at the connection of external transformer of the zero sequence current
RDC-01-057-2 no 3х110 V, 50 Hz
3х380 V, 50 Hz
In phase A and C
RDC-01-057-3 Single-phase, AC/DC
100, 110, 220 V, 50 Hz
In phases А, B, С
RDC-01-057-4 Single-phase, AC/DC
100, 220 V, 50 Hz
no In phases А and С, zero sequence current control at the connection of external transformer of the zero sequence current
RDC-01-057-5 3х110 V, 50 Hz In phases А and С


Model range of the motor protection microprocessor relays
RDC-02, RDC-03, RDC-04, RDC-05, RDC-06


RDC-05 - motor protection microprocessor relay
RDC-05

The relays RDC-02, RDC-03, RDC-04, RDC-05, RDC-06 are intended for complex protection and control by three-phase asynchronous engines of 3 (220/380)V (including submersible pumps) with indication of the reasons of accidents, information transfers on control offices, automatic repeated start-up and a possibility of automatic connection of a reserve and duplication.

The presented model range allows to protect asynchronous engines from consequences:

  • long on time but small current overloads;
  • big pulse overloads (short-circuit rotor);
  • excess of an asymmetry level of the phase currents;
  • underrunning;
  • excess of the supply voltage (except RDС-02);
  • decrease of the supply voltage (except RDС-02);
  • earth current;
  • wrong (reverse) phase rotation before start-up (except RDС-02);
  • decrease of the motor isolation resistance before start-up;
  • sticking of motor starter contacts before start-up;
  • phase break;
  • inadmissible temperature increase of the motor enclosure.

At the same time, except protective functions, the relays have the possibility of monitoring of the following parameters:

  • consumption current on each phase (IA, IB, IC);
  • electric network voltage on each phase (UA, UB, UC) (except RDC-02);
  • network frequency;
  • motor current temperature;
  • the value of the asymmetry of the phase current;
  • earth current;
  • the motor isolation resistance before start-up;
  • the value of an equivalent of thermal energy;
  • the general operating time of the motor;
  • cosφ motor (RDC-04, RDC-06 only);
  • motor active power (RDC-04, RDC-06 only);
  • motor reactive power (RDC-04, RDC-06 only);
  • motor gross power (RDC-04, RDC-06 only);

Purpose of devices

  • RDC-02 - the current relay with operational supply power (it can be used for protection of electric motors 0,4/6/10 of kV);
  • RDC-03 - universal protection of common industrial motors with the maximum necessary set of the protection functions;
  • RDC-04 - universal protection of common industrial motors; it remotely carries out monitoring of all current parameters, reads out information from the magazine where working and emergency events (up to 100) are fixed, makes control of output relays and controls current state of RDTs by means of RS485 under the Modbus RTU protocol and the software "Relsis motor config" which is included in the delivery package; it has an expanded set of functions of protection and service;
  • RDC-05 - universal protection of motors of deep pumps and pump stations with the maximum necessary set of protection functions and with inputs for connection of sensors: emergency, top, lower levels, the dry course, flooding for implementation of automatic inflating or pumping out of liquid, filling/depletion of the tank bulks, etc.;
  • RDC-06 - universal protection of motors of deep pumps and pump stations; it carries out remote control of a condition of all current parameters and sensors, reads out information from the magazine of events (up to 100); it operates the engine via the RS485 interface under the Modbus RTU protocol and software "Relsis motor config", can also switch on/switch off the engine using the timer; it has an expanded set of functions and service.

Distinctive characteristics of a model range RDC-02...RDC-06


Device functions Models
RDC-02 RDC-03 RDC-04 RDC-05 RDC-06
Rated current, А 1-1000 1-1000 1-1000 1-1000 1-1000
Switching off at the rotor blocking of the electric motor + + + + +
Switching off at the current overload of the electric motor + + + + +
Switching off at the underrunning of the electric motor + + + + +
Switching off at the electric motor working with unacceptable asymmetry of currents + + + + +
Switching off of electric motor at excess of level of earth current + + + + +
Switching off of electric motor at current wire tearing off or burning out of the starter contact + + + + +
Switching off at the supply overvoltage   + + + +
Switching off at the decrease of the supply voltage   + + + +
Switching off of electric motor at the disappearance or tearing off of the voltage phase   + + + +
Prohibition of the switching on at the wrong phase rotation/td>   + + + +
Prohibition of the switching on at the isolation destruction of the electric motor + + + + +
Restriction of number of repeated activations of the electric motor + + + + +
Automatic equipment elements
Measurement of temperature of the electric motor by external integrated sensor of temperature + + + + +
Connection of the sensor of the liquid level in the tank       + +
Connection of the sensor "dry course" of the electric motor       + +
Connection of the sensor of the room flood       + +
Logical inputs and outputs for automatic connection of a reserve, duplication and remote control + + + + +
Service functions
Digital indication of operating modes + + + + +
Output for indicator of overcurrent condition         +
Motor control within a day + + + + +
Possibility of switching off of functions which aren't used + + + + +
Motor-meter of the electric motor + + + + +
Measurement of the current operating values of phases currents   + + + +
Measurement of the current operating values of phases voltages + + + + +
Indication of frequency of supply network     +   +
Measurement of the current motor power     +   +
Measurement of cosφ of the electric motor     +   +
Embedded interface RS-485     +   +
Preservation in non-volatile memory of the chronological sequence of the taken place events (up to 100 events)     +   +
Design
Recessed mounting + + + + +
Protuded mounting + + + + +


Complex protection of electric motors
RDC-07


RDC-07 - complex protection of electric motors
РRDC-07

Advanced relays of electric motors protection of the RDTs-07 series have all advantages of the RDTs series and considerably expand borders of the application for protection, control, monitoring of electric equipment with electric motors of 0,4 kV with power from 2,2 to 450 kW.

Functions

  • the maximum current protection with independent and dependent charactiristics;
  • current cutoff;
  • protection against mechanical overloads;
  • protection against prolonged start-up;
  • protection against rotor blocking;
  • protection against asymmetry of the phases currents;
  • protection against excess of current of the return sequence;
  • protection against earth current;
  • protection against minimum working current;
  • protection against overvoltage;
  • protection against undervoltage;
  • protection against phase break;
  • protection against asymmetry of phase voltages;
  • protection against wrong phase rotation and phase aggregation before start-up;
  • protection against decrease of isolation resistance between stator and enclosure of the motor before start-up;
  • protection against excess of the temperature of the motor enclosure;
  • aggregation control of the starter contacts before start-up;
  • automatic repeated connection with an adjustable delay;
  • remote control of the motor;
  • other functions at the request of the customer;
  • data exchange by means of: USB and RS-485 Modbus RTU.