CN110609184A - Comprehensive experimental device and method for relay protection of power system - Google Patents
Comprehensive experimental device and method for relay protection of power system Download PDFInfo
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- CN110609184A CN110609184A CN201910782994.XA CN201910782994A CN110609184A CN 110609184 A CN110609184 A CN 110609184A CN 201910782994 A CN201910782994 A CN 201910782994A CN 110609184 A CN110609184 A CN 110609184A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a comprehensive experimental device and a comprehensive experimental method for relay protection of a power system, which have the advantages of high integration level, small occupied area and cost saving; the device includes PC, switch, industrial computer and a plurality of experiment platform, and every experiment platform includes time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device, time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device are uploaded test data to the industrial computer through the RS485 bus respectively, and the industrial computer will receive data and send to the PC through the switch.
Description
Technical Field
The disclosure relates to the technical field of relay protection, in particular to a comprehensive experimental device and method for relay protection of a power system.
Background
A relay protection device is an automatic device that acts on a circuit breaker to trip or signal a fault or abnormal operation state of electrical equipment in an electric power system. According to regulations, any electrical equipment is not allowed to be put into operation without a relay protection device.
In order to ensure the correct operation of the relay protection device, the relay protection device needs to be tested very carefully in each stage of development, production, installation acceptance, periodic and supplementary inspection. The level of the relay protection testing personnel directly influences the testing result of the relay protection device, so that the relay protection testing device needs to be established for the testing personnel to train and learn so as to improve the testing level.
The inventor discovers that the relay protection device is various in research and development process, a laboratory with complete functions needs to occupy a large laboratory area, the relay protection device is expensive, especially the protection device of ultrahigh-voltage extra-high voltage equipment is expensive, the cost for building the relay protection laboratory is huge, the relay protection device is updated quickly, along with the update of field actual equipment, the relay protection device in the laboratory needs to be updated, and the construction pressure is huge.
Disclosure of Invention
In order to overcome the defects of the prior art, the disclosure provides a comprehensive experimental device and a comprehensive experimental method for relay protection of a power system, which have the advantages of high integration level, small occupied area and cost saving.
The technical scheme of the comprehensive experimental device for the relay protection of the power system in the first aspect of the disclosure is as follows:
the utility model provides an experimental apparatus is synthesized in power system relay protection, the device includes PC, switch, industrial computer and a plurality of experiment platform, and every experiment platform includes time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device, time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device are uploaded test data to the industrial computer through the RS485 bus respectively, and the industrial computer will receive data and send to the PC through the switch.
Furthermore, the time relay characteristic experiment device comprises a microprocessor, an input module, an output module, a first intermediate relay, a simulation channel switch, a first indicator light and a time relay;
the microprocessor is respectively connected with the input module and the output module, the output module is connected with a normally open contact switch of a first intermediate relay, and the first indicator lamp is connected with the other normally open contact switch of the first intermediate relay; the coil of the first intermediate relay is connected with a normally open contact switch of the time relay, the coil of the time relay is connected with the input end of the simulation channel switch, the output end of the simulation channel switch is connected with the microprocessor, and the time delay parameter of the time relay is measured through the microprocessor.
Further, the current relay characteristic experiment device comprises a power supply device and a measuring device; the power supply device is electrically connected with the measuring device; the measuring device comprises a protection module and a measuring module, wherein one end of the protection module is connected with the power supply device, and the other end of the protection module is connected with the measuring module through the electronic bar.
Furthermore, the voltage relay characteristic experiment device comprises a fuse, a light emitting diode, a current limiting resistor, a single-phase self-coupling voltage regulator and a voltage relay check circuit; the input end of the single-phase autotransformer is connected with the fuse, the light-emitting diode and the current-limiting resistor in series, and the output end of the single-phase autotransformer is connected with the voltage relay checking circuit; the voltage relay calibration circuit comprises a direct current output switch, a jog button, a rectifier bridge, a filter capacitor and a voltmeter, wherein the jog button and the direct current output switch are connected in parallel on the circuit connected to the rectifier bridge, the filter capacitor and the voltage collector are connected between two direct current output ends of the rectifier bridge in series, the two direct current output ends of the rectifier bridge are connected with the voltage relay, and the action current value and the return value of the voltage relay are collected through the voltage relay.
Further, the power relay characteristic experiment device comprises a PLC, a load driving module, a contact action signal detection circuit and a power relay; the PLC acquires a starting signal and then outputs a square wave signal to the load driving module; the load driving module drives a load power supply and supplies power to the power relay to enable the power relay to act; the contact action signal detection circuit detects a contact action signal of the power relay, converts the contact action signal into an optical coupling signal and transmits the optical coupling signal to the PLC, and judges whether the contact action characteristic of the relay is qualified or not through the PLC.
The technical scheme of the working method of the relay protection comprehensive experiment device for the power system in the second aspect of the disclosure is as follows:
a working method of a comprehensive experimental device for relay protection of a power system comprises the following steps:
a coil of the detected time relay is connected with a power supply, time delay parameter data of the detected time relay is measured for multiple times through a microprocessor, an average value is obtained, a repeated error of the time delay parameter of the detected time relay is obtained, and time delay parameter test data of the time relay is uploaded to an industrial personal computer;
adjusting a knob of the contact voltage regulator, and outputting uniformly-changed electric quantity to a current relay to be detected; continuously acquiring the action current value and the return current value of the current relay to be detected through a current collector, and uploading the action current value and the return current value to an industrial personal computer;
adjusting a setting value of a voltage relay to be detected, connecting a coil of the voltage relay to two direct current output ends of a rectifier bridge, and enabling a voltage regulator to return to zero; switching on the power switch and the direct current output switch, gradually increasing the output voltage of the voltage regulator, and enabling the voltage relay to act; keeping the output voltage of the voltage regulator unchanged, disconnecting the direct current output switch and pressing a button, enabling the voltage relay to act, enabling the voltage collector to collect the voltage value of the voltage relay, repeating the steps for multiple times, and taking the average value of the voltage value, namely the action voltage value; closing the direct current output switch, gradually reducing the output voltage of the voltage regulator, collecting the current return value of the voltage relay by the voltage collector, repeating the steps for many times, taking the average value as the return value of the voltage relay, and uploading the action voltage value and the return value of the voltage relay to be detected to the industrial personal computer;
the PLC acquires a starting signal and then outputs a square wave signal to the load driving module; the load driving module drives the power relay to act; the contact action signal detection circuit detects a contact action signal of the power relay to be detected, converts the contact action signal into an optical coupler signal and transmits the optical coupler signal to the PLC, and the PLC judges whether the contact action characteristic of the relay is qualified or not and uploads the contact action characteristic test data of the relay to the industrial personal computer;
and the industrial personal computer sends the received delay parameter test data of the time relay, the current relay action current value and return value test data, the voltage relay action voltage value and return value test data and the power relay contact action characteristic test data to the PC through the switch.
Through above-mentioned technical scheme, this disclosed beneficial effect is:
(1) the method and the device realize the test of the time delay parameter of the time relay, the action current value and the return current value of the current relay, the action voltage value and the return value of the voltage relay and the action characteristic of the contact of the power relay, and can enable a worker to master the basic knowledge of relay protection through the practical training of an experimental table, thereby avoiding the problem of difficult understanding in direct learning;
(2) the system has high integration level, integrates a time relay characteristic experiment device, a current relay characteristic experiment device, a voltage relay characteristic experiment device and a power relay characteristic experiment device into a whole, occupies small area and saves cost;
(3) the training function for testing the characteristics of the time relay, the current relay, the voltage relay and the power relay meets the requirement of experimental training of students with relay protection bases, and wiring is convenient and safe.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the application and not to limit the disclosure.
FIG. 1 is a block diagram of a relay protection comprehensive experimental apparatus of a power system according to an embodiment;
FIG. 2 is a block diagram of an experimental apparatus for testing a time relay characteristic according to an embodiment;
FIG. 3 is a block diagram of an apparatus for testing characteristics of a current relay according to an embodiment;
FIG. 4 is a structural diagram of a voltage relay characteristic testing apparatus according to an embodiment;
FIG. 5 is a block diagram of an exemplary embodiment of a power relay characteristic testing apparatus;
FIG. 6 is a circuit diagram of a contact actuating signal detecting circuit according to an embodiment.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
The embodiment provides a relay protection comprehensive experiment device of an electric power system, please refer to fig. 1, the relay protection comprehensive experiment device of the electric power system comprises a PC, a switch, an industrial personal computer and a plurality of experiment platforms, each experiment platform comprises a time relay characteristic experiment device, a current relay characteristic experiment device, a voltage relay characteristic experiment device and a power relay characteristic experiment device, the time relay characteristic experiment device, the current relay characteristic experiment device, the voltage relay characteristic experiment device and the power relay characteristic experiment device are respectively connected with the industrial personal computer through RS485 buses, the industrial personal computer is in communication connection with the switch, the industrial personal computer receives data uploaded by the time relay characteristic experiment device, the current relay characteristic experiment device, the voltage relay characteristic experiment device and the power relay characteristic experiment device, and sending the data to the PC through the switch.
Referring to fig. 2, the time relay characteristic experiment apparatus includes a microprocessor 1, an input module 2, an output module 3, a first intermediate relay 4, an analog channel switch 5, a power module 6, a memory 7, a communication module 8, a first indicator light 9, and a time relay 10.
Specifically, the microprocessor 1 is respectively connected with the input module 2, the output module 3, the memory 7 and the communication module 8, the output module is connected with a normally open contact switch of a first intermediate relay 4, a coil of the first intermediate relay 4 is connected with a normally open contact switch of a time relay 10, a coil of the time relay 10 is connected with an input end of an analog channel switch 5, and an output end of the analog channel switch 5 is connected with the microprocessor 1; the other normally open contact switch of the first intermediate relay 4 is connected with a first indicator lamp 9, and the first indicator lamp 9 is used for indicating the working state of the first intermediate relay 4; the power supply module 6 is used for supplying power to other modules; the microprocessor 1 is also connected with a display module for displaying test data.
When the time relay characteristic experiment device provided by the embodiment is used, the detection of the time delay parameter data of the measured time relay 10 is realized by monitoring the time delay closing signal of the moving contact of the measured time relay 10, the power supply is connected to the coil of the measured time relay, the power supply is switched on, the microprocessor 1 is used for measuring the time delay parameter data of the measured time relay, after the time delay parameter data of the measured time relay is measured and stored, after the power supply is turned off and the time is prolonged for a certain time, the next time delay parameter detection is carried out, and the circulation is carried out in sequence until the determined detection times are finished, processing the stored data, arranging the delay parameter data of each time relay from large to small, selecting the maximum value tmax in the data, and the minimum value tmin is calculated by arithmetic mean to obtain the repeated error of the delay parameter.
The embodiment has strong applicability to the test of the time delay parameter of the time relay, not only greatly simplifies the corresponding test operation, but also provides guarantee for the accuracy and reliability of the test data.
In this embodiment, the input module 2, the output module 3, and the power module 6 respectively adopt the prior art structure, which is not described in detail in this application. The communication module is an RS485 communication module, and the microprocessor 1 is connected with the industrial personal computer through the RS485 communication module and transmits test data to the industrial personal computer.
Referring to fig. 3, the current relay characteristic experiment apparatus includes a power supply apparatus and a measuring apparatus, the power supply device comprises a 220V alternating current power supply 11 and a contact voltage regulator 12, wherein the 220V alternating current power supply 11 is connected with the power supply side of the contact voltage regulator 12, the touch voltage regulator 12 is connected with a measuring device, the measuring device comprises a protection part and a measuring part, the protection part comprises a bipolar air switch 13 with leakage protection and a low-voltage fuse 14, the measuring part comprises a second intermediate relay 21, a current relay 18, a current collector 17, a second indicator lamp 15, a standard winding resistor 19 and a communication device 16, one ends of the two-pole air switch 13 and the low-voltage fuse 14 are respectively connected with the contact voltage regulator 12, the other ends of the two-pole air switch 13 and the low-voltage fuse 14 are respectively connected with the measuring part through a terminal strip 20, so that circuit faults are convenient to overhaul and remove; two normally open switches of the second intermediate relay 21 are connected with a power supply device through the electronic bar 20 and the low-voltage fuse 14, and one normally open switch of the second intermediate relay 21 is also connected with a second indicator lamp 15 and used for indicating the working state of the second intermediate relay 21; one end of the coil of the second intermediate relay 21 is connected with a power supply device through the electronic bar 20 and the low-voltage fuse 14; the other end of the coil of the second intermediate relay 21 is connected with one end of a normally open contact switch of the current relay 18, and the other end of the normally open contact switch of the current relay 18 is connected with the power supply device through the electronic bar 20 and the low-voltage fuse 14; a coil of the current relay 18 is connected with a current collector 17, and the current collector 17 is connected with a communication device 16; the power supply terminals of the current collector 17 and the communication device 16 are connected with a power supply device through an electronic bar 20 and a two-pole air switch 13 respectively.
When the current relay characteristic experiment device provided by the embodiment is used, firstly, the power supply device supplies power to the measuring device, the alternating current 220V voltage 11 supplies working power to the current collector 17 through the two-pole air switch 13 with leakage protection through the terminal strip 20, in addition, the measurement of the return coefficient of the current relay requires that the current is uniformly changed, the output power of the contact voltage regulator 12 is supplied to the coil of the second intermediate relay 21 through the low-voltage fuse 14 and the terminal strip 20, the knob of the contact voltage regulator 12 is adjusted, the output electric quantity can be uniformly changed, and the action value and the return current value of the current relay are collected through the current collector.
In the embodiment, the two-pole air switch 13 with the electric leakage protection and the low-voltage fuse 14 implement the electric leakage protection and the short-circuit protection on the measuring device, thereby ensuring the safety of operators.
In this embodiment, the current collector 17 is further connected to a display device for displaying collected data. The communication equipment is RS485 communication equipment, the current collector is connected with the industrial personal computer through the RS485 communication equipment, and collected current relay action values and return current value data are transmitted to the industrial personal computer.
The current relay characteristic experiment device provided by the embodiment is convenient for testing the return current value of the current relay, calculating the return coefficient and knowing the characteristics of the current relay.
Referring to fig. 4, the voltage relay characteristic experiment apparatus includes a fuse RD, a light emitting diode LED, a current limiting resistor R, a single-phase self-coupling voltage regulator TY, and a voltage relay calibration circuit; the input end of the single-phase autotransformer TY is connected with the fuse RD, the light-emitting diode LED and the current-limiting resistor R in series, and the output end of the single-phase autotransformer TY is connected with the voltage relay checking circuit; the voltage relay checking circuit comprises a direct current output switch S1, a jog button AN1, a rectifier bridge QL, a filter capacitor C2 and a voltage collector 22, wherein a circuit formed by connecting the jog button AN1 and the direct current output switch S1 in parallel is connected to the rectifier bridge QL, the filter capacitor C2 and the voltage collector 22 are connected between two direct current output ends of the rectifier bridge QL in series, and two direct current output terminals of the rectifier bridge QL are externally connected with a tested direct current voltage relay for rectifying alternating current voltage output by a voltage regulator TY into direct current voltage for the tested direct current voltage relay; the voltage collector 22 is connected with a communication device.
The communication equipment is RS485 communication equipment, the voltage collector is connected with the industrial personal computer through the RS485 communication module, and the collected action value and return voltage value data of the voltage relay are transmitted to the industrial personal computer.
In this embodiment, the input end of the single-phase autotransformer TY is connected in series with the fuse RD, the light emitting diode LED and the current limiting resistor R, and the output end is connected with the voltage relay calibration circuit.
When the voltage relay characteristic experiment device provided by the embodiment is used, firstly, the setting value of the voltage relay to be verified is adjusted, the coil of the voltage relay is connected to the two direct current output ends of the rectifier bridge QL, the zero position of the voltage regulator is checked, the power switch S and the direct current output switch S1 are switched on, the output voltage of the voltage regulator is slowly increased, and the voltage relay just acts. Keeping the output voltage of the voltage regulator unchanged, disconnecting S1 and pressing a button AN1, wherein the voltage relay is required to act reliably, and the voltage collector collects the voltage value of the voltage relay. This process should be repeated three times, and the average value is taken as the action voltage value. Closing S1 to slowly reduce the output voltage of the voltage regulator, so that the current relay just returns, and the voltage collector collects the current return value of the voltage relay. The process is repeated for three times, and the average value is the return value of the voltage relay.
In this embodiment, the voltage collector 17 is further connected to a display device for displaying collected data.
The embodiment can measure the voltage value which is usually checked, abandons the checking function of the parameter which is not usually checked, and selects the small device as much as possible under the condition of meeting the requirement, thereby greatly reducing the volume of the voltage relay characteristic experiment device and being portable.
Referring to fig. 5, the power relay characteristic testing apparatus includes a PLC23, a load driving module 24, a contact action signal detecting circuit 26, and a power relay 25 to be tested.
The PLC23 outputs a starting signal to the load driving module 24, the load driving module 24 drives a load power supply and supplies the load power supply to the relay 25 to be tested, the touch action signal extraction circuit 26 extracts a contact action signal of the relay 25 to be tested to the PLC23, and the PLC23 is responsible for analyzing and judging and then outputs a result to the result display module; PLC23 is connected with communication module, and communication module is RS485 communication equipment, and PLC passes through RS485 communication module to be connected with the industrial computer, uploads the data and the result of gathering to the industrial computer.
When the power relay characteristic experiment device provided by the embodiment is used, the PLC23 acquires a start signal through the communication module, and sends a square wave signal with a duty ratio of 50% at 10Hz to the load driving module 24 at the output end of the PLC 23; the load driving module 24 drives a load power supply to the power relay 25 to be tested, so that the power relay operates at the frequency of 10 Hz; the contact action signal detection circuit 26 detects the contact action signal of the power relay 25 to be detected, and then converts the contact action signal into On and Off signals of an optical coupler to the PLC23, the PLC23 can set whether the On signal is received within 30ms of high level or not and whether the Off signal is received within 30ms of low level or not after the action signal is sent out; if a corresponding signal is received within the time limit, the PLC considers that the action characteristic of the relay contact is qualified, otherwise, the PLC is unqualified; and after the test is finished, the PLC outputs the qualified result to the display module so as to display the test result.
Referring to fig. 6, the contact actuation signal detection circuit includes a filtering unit, a rectifier U1, a zener diode D1, a resistor R2, a transistor Q1, and a photocoupler U2; the input end of the filtering unit is connected with a contact switch of a power relay, the output end of the filtering unit is connected with the input end of a rectifier U1, a voltage stabilizing diode D1 is connected in series between the output ends of the rectifier U1, the output end of the rectifier U1 is connected with the base electrode of a triode Q1 through a resistor, the collector electrode of the triode Q1 is connected with a photodiode of a photoelectric coupler U2, and the triode of the photoelectric coupler U2 is connected with a PLC.
When the contact action signal detection circuit provided by the embodiment is used, the filtering unit is connected with the relay, receives a contact closing or releasing signal, filters the signal, outputs the signal to the rectifier U1, rectifies the signal by the rectifier U1, outputs the rectified signal to the base electrode of the triode Q1, drives the triode Q1 and the photoelectric coupler U2 to act, and outputs an output signal to the PLC. The input end of the contact action signal detection circuit is connected with the relay, a contact action signal of the detection relay is input to the base electrode of the triode Q1 through the filtering unit and the rectifier U1, when the voltage difference between the base electrode and the emitting electrode of the triode Q1 is smaller than the action voltage, the triode Q1 is cut Off, the photoelectric coupler U2 does not act, and the PLC receives an Off signal; when the voltage difference between the base electrode and the emitter electrode of the triode Q1 is larger than the action voltage, the triode Q1 is conducted, the photoelectric coupler U2 acts, and the PLC receives an On signal.
The contact action signal detection circuit provided by the embodiment adopts the filtering unit, the rectifier, the triode and the optocoupler, can effectively detect the action characteristic of contact release of the power relay, and is convenient for PLC analysis and judgment.
In the embodiment, the filtering unit is composed of a resistor R1 and a capacitor C1 which are connected in parallel; the rectifier U1 is composed of four diodes.
Example two
The working method of the comprehensive experimental device for relay protection of the power system provided by the embodiment comprises the following steps:
s101, a coil of a detected time relay is connected with a power supply, time delay parameter data of the detected time relay is measured through a microprocessor, after the time delay parameter data of the detected time relay are measured and stored, the power supply is turned off and the time is prolonged for a certain time, next time delay parameter detection is carried out, circulation is carried out in sequence until the determined detection times are finished, the stored data are processed, the time delay parameter data of each time relay are arranged from large to small, the maximum value in the data is selected, the minimum value is subjected to arithmetic mean value calculation to obtain the repeated error of the delay parameter, and the time delay parameter test data of the time relay are uploaded to an industrial personal computer through an RS485 bus.
S102, a power supply is switched on, an output power supply of the contact voltage regulator is input into a current collector through a terminal bar through a two-pole air switch with leakage protection, the output power supply of the contact voltage regulator is input into a coil of a second intermediate relay through a low-voltage fuse and the terminal bar, the coil of the second intermediate relay is switched on to supply power to a current relay to be detected, a knob of the contact voltage regulator is adjusted to output uniformly-changing electric quantity, an action current value and a return current value of the current relay to be detected are collected through the current collector, and test data of the action current value and the return current value of the current relay are uploaded to an industrial personal computer through an.
S103, adjusting a setting value of the voltage relay to be detected, connecting a coil of the voltage relay to two direct current output ends of a rectifier bridge QL, checking that a voltage regulator is in a zero position, closing a power switch S and a direct current output switch S1, and slowly increasing the output voltage of the voltage regulator to enable the voltage relay to just act; keeping the output voltage of the voltage regulator unchanged, turning off S1 and pressing a button AN1, wherein the voltage relay is required to act reliably, and the voltage collector collects the voltage value of the voltage relay. The process should be repeated three times, and the average value is taken as the action voltage value; closing S1 to slowly reduce the output voltage of the voltage regulator, so that the current relay just returns, the voltage collector collects the voltage value of the voltage relay, repeating the steps for multiple times, taking the average value which is the return value of the voltage relay, and uploading the action voltage value and the return value test data of the voltage relay to the industrial personal computer through the RS485 bus.
S104, the PLC acquires a starting signal and sends a square wave signal with 10Hz and 50% duty ratio to the load driving module by an output end; the load driving module drives a load power supply to the power relay to be tested so as to enable the power relay to act at the frequency of 10 Hz; the contact action signal detection circuit detects a contact action signal of the power relay to be detected, and then converts the contact action signal into On and Off signals of the optical coupler to the PLC, and the PLC can set to judge whether the On signal is received within 30ms of high level and whether the Off signal is received within 30ms of low level after the action signal is sent out; if a corresponding signal is received within the time limit, the PLC considers that the contact action characteristic of the power relay is qualified, otherwise, the PLC judges that the contact action characteristic of the power relay is unqualified; after the test is finished, the PLC uploads the qualified result to the industrial personal computer through the RS485 bus.
And S105, the industrial personal computer sends the received delay parameter test data of the time relay, the current relay action current value and return current value test data, the voltage relay action voltage value and return value test data and the power relay contact action characteristic test data to the PC through the switch.
From the above description, it can be seen that the above-described embodiments achieve the following technical effects:
(1) the testing of the time delay parameter of the time relay, the action current value and the return current value of the current relay, the action voltage value and the return value of the voltage relay and the contact action characteristic of the power relay is realized, and through the practical training of an experiment table, the working personnel can master the basic knowledge of relay protection, so that the problem that direct learning is difficult to understand is avoided;
(2) the integration level is high, the time relay characteristic experiment device, the current relay characteristic experiment device, the voltage relay characteristic experiment device and the power relay characteristic experiment device are integrated into a whole, the occupied area is small, and the cost is saved;
(3) the device has the functions of testing and training the time relay characteristic, the current relay characteristic, the voltage relay characteristic and the power relay characteristic, and meets the requirement of experimental training of students with relay protection bases, and the wiring is convenient and safe.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. The utility model provides an experimental apparatus is synthesized in power system relay protection, characterized by, the device include PC, switch, industrial computer and a plurality of experiment platform, and every experiment platform includes time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device, time relay characteristic experiment device, current relay characteristic experiment device, voltage relay characteristic experiment device and power relay characteristic experiment device are uploaded test data to the industrial computer through the RS485 bus respectively, and the industrial computer will receive data and send to the PC through the switch.
2. The comprehensive experimental device for relay protection of the power system as claimed in claim 1, wherein the time relay characteristic experimental device comprises a microprocessor, an input module, an output module, a first intermediate relay, an analog channel switch, a first indicator light and a time relay;
the microprocessor is respectively connected with the input module and the output module, the output module is connected with a normally open contact switch of a first intermediate relay, and the first indicator lamp is connected with the other normally open contact switch of the first intermediate relay; the coil of the first intermediate relay is connected with a normally open contact switch of the time relay, the coil of the time relay is connected with the input end of the simulation channel switch, the output end of the simulation channel switch is connected with the microprocessor, and the time delay parameter of the time relay is measured through the microprocessor.
3. The comprehensive experimental device for relay protection of the power system as claimed in claim 1, wherein the experimental device for characteristics of the current relay comprises a power supply device and a measuring device; the power supply device is electrically connected with the measuring device; the measuring device comprises a protection module and a measuring module, wherein one end of the protection module is connected with the power supply device, and the other end of the protection module is connected with the measuring module through the electronic bar.
4. The comprehensive experimental device for relay protection of the power system as claimed in claim 3, wherein the power supply device comprises an alternating current power supply and a contact voltage regulator, the alternating current power supply is connected with the power supply side of the contact voltage regulator, and the power output end of the contact voltage regulator is connected with the measuring device.
5. The comprehensive experimental device for relay protection of the power system as claimed in claim 3, wherein the protection module comprises a two-pole air switch and a low-voltage fuse, one end of the two-pole air switch and one end of the low-voltage fuse are respectively connected with the power output end of the trigger voltage regulator, and the other ends of the two-pole air switch and the low-voltage fuse are respectively connected with the measurement module through a terminal strip.
6. The comprehensive experimental device for relay protection of the power system as claimed in claim 4, wherein the measuring module comprises a second intermediate relay, a current collector and a second indicator light;
the two normally open contact switches of the second intermediate relay, one end of the coil of the second intermediate relay and one end of the normally open contact switch of the current relay are respectively connected with the power output end of the contact voltage regulator through the electronic bar and the low-voltage fuse; the other end of the coil of the second intermediate relay is connected with the other end of the normally open contact switch of the current relay; the second indicator light is connected with a normally open contact switch of the second intermediate relay; and a coil of the current relay is connected with a current collector, and the action value and the return current value of the current relay are collected through the current collector.
7. The comprehensive experimental device for relay protection of the power system as claimed in claim 1, wherein the voltage relay characteristic experimental device comprises a fuse, a light emitting diode, a current limiting resistor, a single-phase autotransformer and a voltage relay check circuit; the input end of the single-phase autotransformer is connected with the fuse, the light-emitting diode and the current-limiting resistor in series, and the output end of the single-phase autotransformer is connected with the voltage relay checking circuit; the voltage relay calibration circuit comprises a direct current output switch, a jog button, a rectifier bridge, a filter capacitor and a voltmeter, wherein the jog button and the direct current output switch are connected in parallel on the circuit connected to the rectifier bridge, the filter capacitor and the voltage collector are connected between two direct current output ends of the rectifier bridge in series, the two direct current output ends of the rectifier bridge are connected with the voltage relay, and the action current value and the return value of the voltage relay are collected through the voltage relay.
8. The comprehensive experimental device for relay protection of the power system as claimed in claim 1, wherein the experimental device for characteristics of the power relay comprises a PLC, a load driving module, a contact action signal detection circuit and a power relay;
the PLC acquires a starting signal and then outputs a square wave signal to the load driving module; the load driving module drives a load power supply and supplies power to the power relay to enable the power relay to act; the contact action signal detection circuit detects a contact action signal of the power relay, converts the contact action signal into an optical coupling signal and transmits the optical coupling signal to the PLC, and judges whether the contact action characteristic of the relay is qualified or not through the PLC.
9. The comprehensive experimental device for relay protection of the power system as claimed in claim 8, wherein the contact action signal detection circuit comprises a filtering unit, a rectifier, a triode and a photoelectric coupler; the input end of the filtering unit is connected with a contact switch of the power relay, the output end of the filtering unit is connected with the input end of the rectifier, a voltage stabilizing diode is connected between the two output ends of the rectifier in series, the output end of the rectifier is connected with the base of the triode through a resistor, the collector of the triode is connected with a photoelectric coupler, and the photoelectric coupler is connected with a PLC.
10. The operation method of the comprehensive experimental device for relay protection in the power system as claimed in any one of claims 1 to 9, comprising the steps of:
a coil of the detected time relay is connected with a power supply, time delay parameter data of the detected time relay is measured for multiple times through a microprocessor, an average value is obtained, a repeated error of the time delay parameter of the detected time relay is obtained, and time delay parameter test data of the time relay is uploaded to an industrial personal computer;
adjusting a knob of the contact voltage regulator, and outputting uniformly-changed electric quantity to a current relay to be detected; continuously acquiring the action current value and the return current value of the current relay to be detected through a current collector, and uploading the action current value and the return current value to an industrial personal computer;
adjusting a setting value of a voltage relay to be detected, connecting a coil of the voltage relay to two direct current output ends of a rectifier bridge, and enabling a voltage regulator to return to zero; switching on the power switch and the direct current output switch, gradually increasing the output voltage of the voltage regulator, and enabling the voltage relay to act; keeping the output voltage of the voltage regulator unchanged, disconnecting the direct current output switch and pressing a button, enabling the voltage relay to act, enabling the voltage collector to collect the voltage value of the voltage relay, repeating the steps for multiple times, and taking the average value of the voltage value, namely the action voltage value; closing the direct current output switch, gradually reducing the output voltage of the voltage regulator, collecting the current return value of the voltage relay by the voltage collector, repeating the steps for many times, taking the average value as the return value of the voltage relay, and uploading the action voltage value and the return value of the voltage relay to be detected to the industrial personal computer;
the PLC acquires a starting signal and then outputs a square wave signal to the load driving module; the load driving module drives the power relay to act; the contact action signal detection circuit detects a contact action signal of the power relay to be detected, converts the contact action signal into an optical coupler signal and transmits the optical coupler signal to the PLC, and the PLC judges whether the contact action characteristic of the relay is qualified or not and uploads the contact action characteristic test data of the relay to the industrial personal computer;
and the industrial personal computer sends the received delay parameter test data of the time relay, the current relay action current value and return value test data, the voltage relay action voltage value and return value test data and the power relay contact action characteristic test data to the PC through the switch.
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Application publication date: 20191224 |