Relay protection and automation

The training laboratory “Relay protection and automation” is designed for secondary specialized and higher educational institutions.

Category:

3D-model

The laboratory consists of the following equipment:

  1. NTC-09.02 “Means of automation”.
  2. NTC-09.12 “Basic automation and computer engineering”.
  3. NTC-09.14 “Automation on the basis of programmable relay”.
  4. NTC-09.21 “Smart Home”.
  5. NTC-10.10.3 “Relay protection and automation МR500”.
  6. NTC-10.65 “Quality of electric energy in power supply systems with MPMS”.
  7. NTC-10.66 “Relay protection and automation in power supply systems with MPMS”.

NTC-09.02 “Means of automation”

The laboratory unit is intended for the development and implementation of the circuits of automatic control based on PLC.

Structurally, the system consists of the object of automation and the control unit.

The object of automation is a floor construction in the form of a frame rack with equipment placed on it:

  • physical model of communicating vessels;
  • pump – 1 pc .;
  • electric heater – 1 pc .;
  • control valve with position sensor – 1pc .;
  • pressure sensor -1 pc .;
  • level sensor – 1pc .;
  • flow sensor – 1 pc .;
  • temperature sensor – 1 pc.

The control unitis made in the form of an aluminum base with a power supply unit, an input unit and a control panel. The control panel contains the general control circuit of the automation object and the following elements of the control circuit: PLC, control relay, control elements and switching sockets.

Experiments provided:

  1. Developing and testing the level control system.
  2. Developing and testing the temperature control system.
  3. Developing and testing the pressure control system.
  4. Developing and testing the flow rate control system.

NTC-09.12 “Basic automation and computer engineering”

The laboratory system is designed to conduct laboratory experiments in secondary vocational and higher educational establishments. 
Structurally, the training system consists of the case with installed electric equipment, electric circuit boards, front panel and the tabletop of integrated desktop.
 
The following equipment is located inside:

  • power supply unit ±15 V (1 А current), +5 V (1 А current);
  • circuit board of frequency rotation meter;
  • discriminators circuit board;
  • generators circuit board;
  • amplifiers circuit board.

Electric schematics of investigated objects are displayed on the front panel. All the schematics, displayed on the panel, are divided into the groups, according to the theme of investigated experiments.

 
Switch sockets, switch gear apparatus, controls, allowing to change the elements parameters during laboratory experiments, are installed on the front panel.
 
The investigated objects are located on the front panel:

  • a pair of self-synchronous devices;
  • a pair of rotating transformers;
  • potentiometric sensors;
  • inductive sensor of frequency rotation;
  • DC motor.
To conduct laboratory experiment it’s necessary to assemble the schematic of investigated object, using unified jumpers, which allow to show the schematic in visual form.
All the required measurements are done, using signal LEDs / multimeter (is delivered separately) and integrated digital oscilloscope.

Experiments provided:

  1. Investigation of potentiometric transducers.
  2. Investigation of inductive transducers.
  3. Investigation of modulators and demodulators.
  4. Investigation of rotary transformers.
  5. Investigation of selsyns operating in modes of indicator and transformer.
  6. Investigation of potentiometer remote transmission.
  7. Investigation of selsyn remote transmission.
  8. Investigation of potentiometric servo system.
  9. Investigation of selsyn-controlled servo system.
  10. Investigation of servo system with rotary transformers
  11. Linear circuits.
  12. Investigation of diode limiters.
  13. Investigation of multivibrator.
  14. Investigation of transistor blocking oscillator.
  15. Investigation of sawtooth voltage generator.
  16. Investigation of digital phase discriminators.
  17. Investigation of time discriminator.

NTC-09.14 “Automation on the basis of programmable relay”

The bench is divided into two areas:

1. Logic module “LOGO!” This area includes a programmable relay Siemens, a display unit of programmable relay inputs and outputs and a controller unit of digital and analog inputs.
2. Model of reservoir. This area indicates the controlled object and controllers. The reservoir state change is indicated by the display. The object control is possible both in automatic and manual modes.

To enable the study of the programmable relay, the bench contains four independent digital signal sources and an analog one; the signals are fed to the respective inputs of the programmable relay.

Relay programming is carried out using a PC.

NTC-09.21 “Smart Home”

The training laboratory bench NTC-09.21 “Smart Home” structurally consists of two separate parts (units) and a set of training elements connected to electric circuits.

The bench is designed for use as training equipment at universities and secondary educational institutions in practical and laboratory work.

Laboratory experiments for training specialists in automation of premises are conducted using the bench. The principal element base and performance characteristics of separate systems of control as well as techniques of event process programming are studied.

Structurally each unit consists of a body with a front panel and integrated tabletop.

The following equipment is located on the front panel of the first unit:

  • mains switch;
  • power supply system;
  • central element;
  • adapter module;
  • extension module.

The following equipment is located on the front panel of the second unit:

  • discrete sensor module (switches, state loops, hygrostat, room thermostat, motion sensors);
  • lighting unit (four independent light sources form two lighting zones);
  • temperature control unit (emulation of thermosensors by means of potentiometers and possibility of real thermosensors connection);
  • proportional power units (thermal control valves with proportional control);
  • lighting control unit (light sensor of direct lighting control);
  • louvers unit (external lighting control).

Electric connection between the units is accomplished by means of cables with special marked jacks.

Modular organization and mnemonic diagrams provide rapid mounting of the components, as well as simplicity and clarity in the process. The use of hard contact jumpers of plug type prevents incorrect circuit assembly.

The bench is completed with the set за removable sensors connected to its systems:

  • temperature sensors (0…+70 °C, -40…+125 °C);
  • leakage detector.

Experiments provided:

  1. Power supply systems, systems of data bus communication of central element with peripheral modules.
  2. Setting up the connection of system central element with PC.
  3. Introduction of central element in operation. Configuring the system.
  4. Adjustment of lighting control systems with relay outputs.
  5. Adjustment of lighting control systems with analog outputs. Central element programming.
  6. Assembly and commissioning of discrete signal input system. Incoming signals programming and processing.
  7. Sensors used in control and protection systems. Connection of sensors to control system.
  8. Lighting control using motion and light sensors.
  9. Temperature control. Events processed by temperature control unit.
  10. Assembly and commissioning of control system of proportional actuators with analogue regulation.
  11. Programming the two-way communication between control system and user via GSM-channel.

NTC-10.10.3 “Relay protection and automation МR500”

The educational laboratory stand is designed for carrying out laboratory works in “Relay protective automation” in secondary educational institutions.

Constructively the stand consists of a body where some electrical equipment, a relay, a frontal panel and a tabletop of an integrated worktable are installed.

The following items are placed inside the body:

  • step-down transformers;
  • module of load resistors.

The electrical diagram of the laboratory stand is depicted on the frontal panel. A module of automatic circuit breakers, a power unit BPT-615, a microprocessor protective relay  MR-500, instrumentation, indicators and controls are installed on the panel.

Readings are registered according to digital ammeters and the PLC-display of the microprocessor relay.

The stand allows conducting the following operations:

  • study of the microprocessor protective relay MR-500 programming;
  • study of the current changes in the line phases in nominal operating mode and with different types of faults (single- , two-, three-phase short circuits);
  • study of the microprocessor protective relay MR-500 operation in nominal operating mode of the line and with different types of faults (single- , two-, three-phase short circuits);
  • microprocessor protective relay MR-500 remote control.

Experiments provided:

  1. Study of the microprocessor protective relay MR-500 and its software;
  2. Setting the parameters of protection against overcurrent and checking its work with different types of faults (single- , two-, three-phase short circuits);
  3. Setting the parameters of protection against zero-sequence overcurrent and checking its work with different types of faults (single- , two-, three-phase short circuits);
  4. Setting the actuation of the protective relay MR-500 from external signals;
  5. Configuring receipt of discrete control signals, assigning commands for the protective relay MR-500 and checking its work with different types of faults (single- , two-, three-phase short circuits);
  6. Study of operation of power unit BPT-615 for power supply of the microprocessor relay protection devices in “main power” and “standby power” modes.

NTC-10.65 “Quality of electric energy in power supply systems with MPMS”

The laboratory stand is designed for carrying out laboratory works in universities and secondary technical educational establishments for the study of “Power Supply of Industrial Enterprises”, “Electrical systems and networks”, etc. 

Structurally the stand consists of a body in which part of electric equipment, microprocessor measuring system, front panel and desktop of integrated table are mounted. 

The body of the stand contains: 

  • step-down transformers;
  • load resistor block;
  • capacitor unit;
  • throttles;
  • power autotransformer based on OCM1-0.1;
  • microprocessor measuring system module.

The module of microprocessor measuring system allows multi-channel measurements in all three phases with the display of current and voltage measured values on digital indicators. The complex of measured parameters is sufficient for the effective study of processes in electricity systems without connecting the stand to computer. Connecting computer to the stand (USB) and using the supplied software allows displaying current and voltage oscillograms in each of the three phases in both static and transitory processes. This activity helps to raise significantly the quality of knowledge received in the process of doing the laboratory work. 

The front panel shows electrical circuits of objects under study. All the circuits shown on the panel are divided into groups according to the subject-matter of works. Patchholes, digital devices indicators, switching equipment and controls allowing to alter operating parameters are mounted on the panel. 

The controls on the front panel of the stand include: 

  • the switch of incandescent lamp block (load) allowing to set various operation modes of the three phase circuit;
  • capacitance box toggle switches which allow to alter capacity between 0..31 microfarad with 1 microfarad step;
  • assigning potentiometer TVR.

Experiments provided:

  1. The measurement of quality parameters of electric energy using personal computer.
  2. Determining voltage deviation influence on power consumed by the load.
  3. Counter voltage control.
  4. Voltage control by reactive power shunt compensation using capacitor bank.
  5. Voltage control by reactive power longitudinal compensation using capacitor bank.
  6. Decreasing current higher harmonic generation level by exchanging half-wave rectifier for full-wave rectifier in feeding circuit load with direct current.
  7. The compensation of current higher harmonics using filter compensation device.

NTC-10.66 “Relay protection and automation in power supply systems with MPMS”

The laboratory stand is designed for carrying out laboratory works in universities and secondary technical educational establishments for the study of “Power Supply of Industrial Enterprises”, “Relay protection and automation”, etc. 

The object of study is relay protection and automation devices in electricity supply systems. 

Structurally the stand consists of a body in which part of electric equipment, microprocessor measuring system, front panel and desktop of integrated table are mounted. 

The body of the stand contains: 

  • power transformer ОСМ-0,1;
  • stopwatch board with resolution 0,1 sec. to measure relay time actuation;
  • load resistor block;
  • the module of microprocessor measuring system allows multi-channel measurements in all three phases with the display of current and voltage measured values on digital indicators. The complex of measured parameters is sufficient for the effective study of processes in electricity systems without connecting the stand to computer.

The front panel of the stand is divided into two parts: schematic and hardware. The schematic part of the front panel shows electrical circuits of objects under study. All the circuits shown on the panel are divided into groups according to the subject-matter of works. Patchholes, digital devices indicators, switching equipment and controls allowing to alter operating parameters are mounted on the panel.

The hardware part of the front panel of the stand contains the indicator lights and handle of parameters settings of the researched devices of relay protection and automatic for customer’s own assembly of protection and automation circuits. 

Experiments provided:

  1. The study of maximum current protection of electricity supply line.
  2. The study of instantaneous current cutoff of electricity supply line.
  3. The study of maximum current protection of radial electricity supply line with single-way feed.
  4. The study of longitudinal differential protection of electricity supply line.
  5. The study of transverse differential protection of electricity supply line.
  6. The study of transformer differential protection.
  7. The study of maximum current protection of electric circuit using automatic switch.
  8. The study of electric circuit protection from overload using thermal release of automatic switch.
  9. The study of automatic reclosure of electricity supply line power backup.
  10. The study of automatic reclosure of electricity supply line.
 
 

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