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Model Range of Electric Motors Microprocessor Protection
RDC-02, RDC-03, RDC-04, RDC-05, RDC-06


RDC-05 - motors microprocessor protection
RDC-05

The devices RDC-02, RDC-03, RDC-04, RDC-05, RDC-06 are intended for complex protection and control of three-phase asynchronous motors 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 input of a reserve and duplication.

The presented model range allows to protect asynchronous motors from the following consequences:

  • small current overloads for a long time;
  • big impulse overloads;
  • excess of level of asymmetry of phase currents;
  • underrunning;
  • excess of supply voltage (except RDTs-02);
  • decrease of supply voltage (except RDTs-02);
  • earth current;
  • wrong (return) phase rotation before start-up (except RDTs-02);
  • reduction of insulation resistance of electric motor before start-up;
  • sticking effect of starter before start-up;
  • phase break;
  • inadmissible temperature increase of the motor case.

At the same time, except protective functions, the relay has a possibility of monitoring of the following parameters:

  • supply current in each phase (IA, IB, IC);
  • network voltage in each phase (UA, UB, UC) (except RDTs-02);
  • network frequency;
  • current temperature of electric motor;
  • asymmetry size of of phase currents;
  • earth current;
  • insulation resistance of electric motor before start-up;
  • value of equivalent of thermal energy;
  • total life cycle of electric motor;
  • cosφ of electric motor (RDTs-04 and RDTs-06 only);
  • active power of electric motor (RDTs-04 and RDTs-06 only);
  • reactive power of electric motor (RDTs-04 and RDTs-06 only);
  • gross power of electric motor (RDTs-04 and RDTs-06 only).

All devices of this series have:

  • Three output relays:
         - the first relay has one make contact and one change-over contact (it is intended for switching on of starter of electric motor);
         - the second relay ("Overloading") has one make contact (it is turned on at a current overload and can serve for the alarm system about motor overload;
         - the third relay "Emergency" has one make contact (the relay are maked after shutdown of output relay because of emergency and can serve for the alarm system or for start of the reserve motor.
  • The input "Start-up" for remote control (it allows to combine operation of several RDTs devices).
  • Possibility of work with 2-speed motors (there are an adjustment parameter of the current of the second step and control input).
  • Possibility of shutdown of some protective functions (it allows the consumer to adjust flexibly the protection taking into account motor service conditions).
  • Controlled time of a delay before the first start-up that doesn’t allow to start several motors at the same time.

Besides, RDC-04 and RDC-06 have an opportunity:

  • Control and data transmission about a relay condition by means of the RS485 interface (Modbus RTU protocol) on control office;
  • Preservation of accidents history in a chronological order and also the measured data on each accident;

There is a possibility of sencors connection in modifications for submersible pumps (RDC-05 and RDC-06):

  • sencor of emergency level;
  • sencor of the top level;
  • sencor of the lower level;
  • sencor of the dry course;
  • sencor of flooding.

Purpose of devices

  • RDC-02 - current relay with operational power supply (it can be used for the electric motor protection 0,4/6/10 kV);
  • RDC-03 - universal protection of common industrial motors with the most necessary set of protection functions;
  • RDC-04 - universal protection of common industrial motors; carries out monitoring of all current parameters remotely; reads out information from the magazine where working and emergency events are fixed (up to 100); operates output relays and controls current state RDC by means of RS485 using Modbus RTU protocol and software "Relsis motor config", which is included in delivery package; it has an expanded set of protection functions and service;
  • RDC-05 - universal protection of motors of deep pumps and pump stations with the most necessary set of functions of protection and inputs for connection of sensors of 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; carries out remote control of a condition of all current parameters and sensors; reads out information from the log (up to 100); operates the motor via the RS485 interface under the Modbus RTU protocol and software "Relsis motor config"; also switches on/switches off the motor on the timer; has an expanded set of functions and service


SUZD - the stations of control of electric motors

On the basis of the protection devices of the RDC series the stations of control of electric motors are made at the enterprise. The stations are intended for work with the three-phase asynchronous motors 550 W – 350 kW of various producers. The stations are made according to various schemes with a possibility of a full complete set of electric equipment. They are intended for automatic and manual control, automation, scheduling and also in various systems of water supply where asynchronous motors are used. The stations automatically support the set pressure in the system of water supply or the set level in the tank, provide complex protection of the electric motor against emergency operation. Learn More...




Main technical characteristics


Parameter Value
Rated phase supply voltage of the relay Uphase.rated, frequency 50 Hz: 220 V
Permissible deviations of supply voltage:
- upper limit
- lower limit
 
+30% from Urated
–35% from Urated
Rated input current internal transformers of current for each phase 5 А
Average main error of measurement of voltage and current 2,5 %
Number of decimal places of the indicator:
- 1 place
- 3 places
4
mode
value
Formation of limits for voltage:
- setting of maximum voltage Umax
- setting of minimum voltage Umin
 
240...280 V
150...210 V
Link hysteresis on the maximum voltage
Setting of link hysteresis of minimum voltage
4...6%
5...20%
Discrete step of settings on tension, V 1
Formation of limits for current:
- setting of ratio transformer of external transformer of current КT
- setting of rated current of the motor Irated
 
1...200
1....9999А
Setting of turning on limit of the link of short-circuit rotor for current
- actuation setting of the link of minimum current
- setting of asymmetry of loading current Iasym
- actuation setting for leakage current
(1,1...6,0) Irated
(20...80)% Irated
(20...50)% Irated
(5...10)% Irated
Discrete step for current (it depends on КT):
- при КT= (1...2)
- при КT= (3...20)
- при КT= (21...200)
 
0,01 A
0,1 А
1 A
Hysteresis for actuation current 4...6%
Formation of time parameters:
- setting of delay time before motor start-up tdelay start-up
- setting of start-up time of electric motor tstart-up
- setting of actuation delay of the link of minimum current tdelay min. current
- setting of delay time of link turning on of asymmetry of current tdelay asym.
- setting of delay time of link turning on of short-circuit rotor as a time
- setting of delay time of link turning on of min and max voltage tdelay m-m.
- setting of delay time before repeated start-up of electric motor tdelay repeated
- setting of a number of automatic repeated start-up after emergency shutdown
 
1...30 s
1...300 s
0...250 s
0...120 s
0,5...10 s
1...250 s
1...120 s
0...100
Setting of limit of link turning on of isolation resistance measurement before start-up 0,2...1,0 mОm
Setting of link actuation limit of temperature measurement 40...100°С
Link hysteresis of temperature measurement 10°С
Switching capacity in the circuits of alternating current АС-22, VА 250
The relay doesn't give false operations (short circuits/disconnections of contacts) at short-term failures and splashes in the supply voltage on duration not more than 50 ms.
Weight of the relay, kg not more than 1,6
Mechanical durability and electrical endurance of the relay, cycles not less 500 000
Power consumption in the range of the supply voltages, VА not more than 5
Number of output relays:
- relay К1 "Work"
- relay К2 "Fault"
- relay К3 "Overload"
 
1
1
1
Interface (RDC-04, RDC-06) RS485 (MODBUS)


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


Functions of the device Modifications
RDC-02 RDC-03 RDC-04 RDC-05 RDC-06
Rated current, А 1-1000 1-1000 1-1000 1-1000 1-1000
Turning off at blocking of the rotor of the electric motor + + + + +
Turning off at current overloading of the electric motor + + + + +
Turning off at working of electric motor with underrunning + + + + +
Turning off at working of electric motor with unacceptable asymmetry of currents + + + + +
Turning off of electric motor at excess of level of earth current + + + + +
Turning off of electric motor at current wire breakage or at burning of starter contact + + + + +
Turning off at excess of supply voltage   + + + +
Turning off at decrease of supply voltage   + + + +
Turning off of electric motor at voltage loss or disconnection of phase of voltage   + + + +
Inhibit of turning on at wrong phase rotation   + + + +
Inhibit of turning on at insulation fault of electric motor + + + + +
Restriction of a number of repeated start-ups of electric motor + + + + +
Automatic equipment elements
Temperature measurement of electric motor by external integrated sensor + + + + +
Connection of sensors of liquid level in the tank       + +
Connection of sensor of "dry course" of electric motor       + +
Connection of sensor of housing flooding       + +
Logical inputs and outputs for the automatic use of a reserve (AVR), duplication and remote control + + + + +
Service functions
Digital indication of operating modes + + + + +
Output for indicator of current overloading         +
Motor control by means of time a day + + + + +
Possibility of turning off the functions which are not used + + + + +
Counter of motor age limit + + + + +
Measurement of effective current for each phase   + + + +
Measurement of effective value of voltage for each phase + + + + +
Indication of frequency of supply power network     +   +
Measurement of motor power     +   +
Measurement of cosφ of electric motor     +   +
Embedded interface RS-485     +   +
Preservation (in non-volatile memory) of the taken place events (up to 100 events) in the chronological sequence     +   +
Design
Recessed mounting + + + + +
Projection mounting + + + + +