CN211426651U - Relay protection device export check-up instrument - Google Patents
Relay protection device export check-up instrument Download PDFInfo
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- CN211426651U CN211426651U CN201921630113.4U CN201921630113U CN211426651U CN 211426651 U CN211426651 U CN 211426651U CN 201921630113 U CN201921630113 U CN 201921630113U CN 211426651 U CN211426651 U CN 211426651U
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Abstract
The utility model relates to an electric power system technical field, in particular to electric power system relay protection device examines a relay protection device export check-up instrument of export check-up link surely. The LED intelligent alarm device comprises a shell, and a power supply circuit, an outlet voltage acquisition circuit, a signal transmission isolation circuit, a central processing unit, an LED driving display circuit, a liquid crystal display circuit, a buzzer alarm circuit and a key input circuit which are arranged in the shell; the LED alarm device is characterized in that the outlet voltage acquisition circuit, the signal transmission isolation circuit and the central processing unit are sequentially connected, the central processing unit is further respectively connected with the LED driving display circuit, the liquid crystal display circuit, the buzzer alarm circuit, the key input circuit and the power circuit, and the power circuit is further respectively connected with the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit. The utility model discloses reduced auxiliary instrument, simplified the test procedure, improved the test accuracy.
Description
Technical Field
The utility model relates to an electric power system technical field, in particular to electric power system relay protection device examines a relay protection device export check-up instrument of export check-up link surely.
Background
At present, power systems are rapidly developed, and relay protection devices play an important role in guaranteeing reliable operation of power grids. According to the regulation of China electric power industry standard DL/T995-2006 secondary protection device inspection regulation: "when all the relay protection devices are checked, the on-off state of the output contacts (outlets) which are put into use by the protection devices must be checked in sequence. "
At present, due to various reasons such as various types of transformer substation protection devices, large regular inspection workload, misoperation of workers, device faults and the like, the output of the transformer substation protection device is checked to be wrongly detected and missed, and accidents such as faulty operation, misoperation and non-output of actions of the protection device are caused to happen occasionally.
The protection device outlet calibrator is mainly used for detecting the potential and time of the lower end of the outlet pressure plate in the protection outlet link in the transmission process of the protection device and autonomously judging whether the potential and the time are consistent with the setting of the protection device constant value. When the sequence and time of the protection outlet are different from the setting of the protection fixed value, the false outlet can be caused, and a large-area power failure accident can be caused.
The existing relay protection tester (such as Oncai and Saturn star D7000, Bo dynasty) can only complete the check of the action logic in the protection device by adding current and voltage with time limit to the device, but does not relate to the check of the protection outlet pressure plate, usually, the potential at the lower end of the outlet pressure plate in the transmission process is measured by a multimeter, and the successive action condition of each outlet is determined by observing the successive change condition of the readings by naked eyes.
The manual multimeter is adopted, and the test work can be finished by at least two persons, so that the personnel redundancy is realized, and the efficiency is low. For the single-outlet protection device, the number is indicated by an observation multimeter, so that the verification is easy to realize; to the protection device of many exports, need a plurality of universal meters simultaneous measurement export clamp plate lower extreme's electric potential, the export clamp plate that corresponds is measured simultaneously to a plurality of universal meters at first, the phenomenon of contact failure appears easily, and secondly a plurality of universal meters must be with the model, and the inherent time delay of the instrument of non-with the model in the collection process is different, has the error and then influences final judged result. Because the internal node of the protection device acts quickly, the checking of the electric potential of the outlet pressing plate needs to be completed in a very short time, the observation level of human eyes is limited, and the electric potentials of a plurality of protection outlet pressing plates are observed simultaneously, so that the phenomena of inaccurate observation result and error checking are easy to occur. Usually, the verification process needs multiple measurements, and finally, the test results are summarized to obtain the maximum distribution.
Therefore, the existing testing method for the outlet calibration link of the protection device is purely manual operation, poor connection contact between the instrument and the outlet pressure plate is easy to occur, and the testing result is inaccurate; the requirement on the observation level of instruments and human eyes in the test process is high, and the limitation is large; meanwhile, the testing process needs to be measured for many times, and the defects of low efficiency and the like exist.
SUMMERY OF THE UTILITY MODEL
To the above prior art, an object of the utility model is to provide a relay protection device exports check-up instrument, makes the instrument of accurate judgement and calculation and carries out real-time demonstration to detection and operation result to export clamp plate lower extreme electric potential and time in protection device transmission process.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an outlet calibration instrument of a relay protection device comprises a shell, and a power circuit, an outlet voltage acquisition circuit, a signal transmission isolation circuit, a central processing unit, an LED driving display circuit, a liquid crystal display circuit, a buzzer alarm circuit and a key input circuit which are arranged in the shell; the output voltage acquisition circuit, the signal transmission isolation circuit and the central processing unit are sequentially connected, the central processing unit is also respectively connected with the LED driving display circuit, the liquid crystal display circuit, the buzzer alarm circuit, the key input circuit and the power circuit, and the power circuit is also respectively connected with the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit;
and the operating panel of the shell is provided with a power switch, a grounding terminal plug, an alternating current input plug, a test button, a liquid crystal display screen, an LED lamp and a plurality of paths of detection input terminals for connecting the lower end of the outlet pressing plate.
Furthermore, the central processing unit comprises a microprocessor and a filter circuit, and is used for finishing logic algorithm processing of the acquired signals and controlling the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit; the microprocessor includes a timer.
Further, the power circuit comprises a power switch, an alternating current output interface and an AC/DC module for adapting the required power for the instrument conversion.
Furthermore, the outlet voltage acquisition circuit comprises a voltage division resistor and an operational amplifier, wherein the voltage division resistor is used for dividing voltage by adopting a large resistor at the acquisition front end so as to reduce the influence on the signal source, and the signal source after voltage division by adopting the large resistor is connected to the microprocessor.
Further, the key input circuit comprises four keys adopting a common negative connection method, namely a confirmation key for opening or closing any one detection channel, an up-turning key and a down-turning key for switching the detection channel back and forth, and a reset key for clearing the detection result.
Furthermore, the signal transmission isolation circuit is an optical coupling isolation circuit and comprises a current-limiting resistor and an optical coupling isolation loop.
Further, the power module also comprises a standby storage lithium battery.
Further, the microprocessor is an STM32F103 single chip microcomputer; the LED lamp adopts a high-power waterproof lamp bead; a liquid crystal display screen in the liquid crystal display circuit adopts a color liquid crystal screen based on a USART protocol; the detection input terminal adopts a test wire clamp.
Has the advantages that:
(1) the utility model has the advantages that the utility model does not need to rely on human eyes and universal meter observation, and when multi-outlet calibration is carried out, auxiliary instruments are greatly reduced, and the test process is simplified; the method avoids the detection misalignment caused by the error of the test result due to the inherent delay of the instrument when a plurality of multimeters acquire simultaneously.
(2) The utility model discloses the inspection instrument adopts the outlet voltage acquisition circuit, can carry out many outlet voltage's collection simultaneously, carries out the isolation of transmission course through the opto-coupler, and transmission discerns, judges to microprocessor, falls to interference factor minimumly, has saved the people in the middle of moreover and has observed the judgement link, improves the degree of accuracy of testing process.
(3) When the traditional method is used for outlet verification, at least two persons are needed for the verification; wherein one person carries out the output of relaying the tester, and one person connects universal meter pen to observe the change of universal meter registration. The utility model discloses the design of integration is adopted to the inspection instrument, and the potential detection of each export clamp plate is independently accomplished to the export check gauge, through the inside procedure of microprocessor, realizes the judgement of each clamp plate action order, carries out real-time demonstration through liquid crystal display and LED lamp.
(4) The utility model discloses the time that the check instrument began to this stage of clamp plate output from the transmission with the help of the inside time-recorder of microprocessor is calculated, reaches the purpose of checking with device definite value setting, has further improved the reliability of device operation.
(5) The utility model discloses the outlet voltage acquisition circuit that inspection instrument adopted, when carrying out the protection device export check-up of two sets of DC power supply difference power supplies simultaneously, can not induce "direct current closes the ring" trouble, the check-up process can not influence the direct current system normal operating of transformer substation.
Drawings
FIG. 1 is a plan view of a protective device outlet verification instrument;
FIG. 2 is a system block diagram of a protection device outlet verification instrument;
FIG. 3 is a schematic diagram of an internal circuit of the microprocessor;
FIG. 4 is a schematic diagram of an outlet voltage acquisition circuit;
FIG. 5 is a schematic diagram of a key circuit;
FIG. 6 is a schematic diagram of a signal transmission isolation circuit;
FIG. 7 is a schematic diagram of an LED driving display circuit;
FIG. 8 is a schematic diagram of a buzzer warning circuit;
FIG. 9 is a schematic diagram of a power supply circuit;
FIG. 10 is a schematic diagram of the wiring of the LCD circuit;
FIG. 11 is a schematic diagram of the main flow of software;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 to 11 show an outlet calibration instrument for a relay protection device, which includes a housing and a plurality of circuits disposed in the housing, wherein the housing is made of magnesium-aluminum alloy, as shown in fig. 1, in the drawings: 16 LED lamps 1, the magnalium casing 2 of check-up instrument, liquid crystal display 3, 4 waterproof buttons of metal 4, 1-16 way export clamp plate lower extreme detect input terminal 5, direct current negative binding post 6, switch 7, ground terminal socket 8, exchange input socket 9.
As shown in fig. 2, the circuit in the magnalium casing 22 of the checking instrument comprises a power circuit, an outlet voltage acquisition circuit, a signal transmission isolation circuit, a central processing unit, an LED driving display circuit, a liquid crystal display circuit, a buzzer alarm circuit and a key 4 input circuit; the LED alarm device is characterized in that the outlet voltage acquisition circuit, the signal transmission isolation circuit and the central processing unit are sequentially connected, the central processing unit is further respectively connected with the LED driving display circuit, the liquid crystal display circuit, the buzzer alarm circuit, the key 4 input circuit and the power circuit, and the power circuit is further respectively connected with the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit.
The central processing unit comprises a microprocessor STM32F103 and a filter circuit and is used for finishing logic algorithm processing of collected signals and controlling the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit. The internal circuit of the microprocessor is shown in fig. 3.
As shown in fig. 9, the power circuit comprises a power switch 7, an AC output interface and an AC/DC module for adapting the required power for the instrument conversion. When the power switch 7 is switched on, the alternating current 220V feeding device is converted into 12V through the AC/DC module to supply power to the instrument, the 12V direct current is stabilized into +3.3V direct current through the voltage stabilizing chip to be used by the microprocessor, and the 12V direct current is stabilized into +5V direct current through the voltage stabilizing chip to be used by the liquid crystal screen.
As shown in fig. 4, the outlet voltage acquisition circuit includes a voltage-dividing resistor and an operational amplifier, and completes 16 analog sampling circuits, and the acquisition front end adopts a large resistor to divide voltage (the signal input impedance exceeds 10 mega ohms), so that the influence of the sampling circuit on the signal source can be minimized, and the integrity of the signal can be ensured to the greatest extent. And when the outlets of the protection devices respectively powered by the two sets of direct current systems are verified at the same time, the direct current loop closing alarm cannot be induced, and the operation of the direct current systems in the station cannot be influenced.
The impedance of the signal source after voltage division by the large resistor is too high, and the signal source cannot directly enter the analog quantity sampling port of the microprocessor, so that the impedance of the signal source is not matched with the impedance of the analog port of the microprocessor, and the voltage value sampled by the microprocessor is abnormal, thereby influencing the final outlet calibration accuracy. The instrument uses a TLC2274 operational amplifier to carry out primary impedance matching, converts a high-impedance signal into a low-impedance signal and then enters a microprocessor analog quantity sampling port, so that the transmission integrity of a sampling signal is ensured to the greatest extent, and the voltage precision sampled by a microprocessor is ensured.
The TLC2274 is used for achieving the effect of impedance matching in the signal transmission process and also achieving the effect of signal isolation, so that one-level protection is added between an external interface and a single chip pin, and the single chip pin can be prevented from being damaged due to static electricity or instantaneous high voltage introduced into a circuit board by an external port.
As shown in fig. 5, the input circuit of the key 4 includes four keys 4 adopting a "common negative" connection method, namely, an "enter" key for opening or closing any one of the detection channels, an "flip-up" key and a "flip-down" key for switching the detection channels back and forth, and a "reset" key for clearing the detection result. And pressing a reset key, resetting the test result, and entering a test process of 30 seconds.
As shown in fig. 6, the signal transmission isolation circuit includes a current-limiting resistor and an optocoupler, for the voltage acquisition loop, the voltage small signal after internal resistance voltage division cannot be directly sent to the logic operation unit, electromagnetic interference and signal fluctuation both affect the operation judgment of the logic operation unit on the voltage small signal, the optocoupler isolation loop is used, an external outlet voltage signal drives the light emitting diode, light emission is detected inside, and the light is transmitted to the microprocessor after amplification, so that the interference of the external signal on the voltage acquisition signal is isolated.
As shown in fig. 7, the LED driving display circuit includes: the Darlington power amplifier is connected with external 12V direct current for power amplification, and outputs a digital signal through the microprocessor to drive the LED lamp 1 bead with high power current at the output end.
As shown in fig. 8, the buzzer alarm circuit includes: triode drive circuit, buzzer, microprocessor input circuit. When the microprocessor detects that the outlet voltage is less than 80V or more than 140V, a signal is sent out to drive the buzzer, an operator is informed that the direct-current voltage is abnormal, and the operator is asked to check the direct-current voltage in time.
The liquid crystal display circuit is used for displaying the test result in real time, the display content comprises the voltage and the action time of each acquisition channel and the action sequence of each outlet in the transmission process, and the closing or opening of each acquisition channel can be completed by matching with the input circuit of the key 4. The liquid crystal display 3 is directly connected with the output control of the microprocessor as shown in fig. 10.
The shell 2 is made of magnesium-aluminum alloy; the LED lamp 1 adopts a high-power waterproof lamp bead; the liquid crystal display screen 3 adopts a color liquid crystal screen based on a USART protocol; the detection input terminal 5 adopts a test wire clamp; the power module further comprises a 12V lithium battery, and when the outdoor protection device control cubicle is subjected to export detection and 220V alternating current is inconvenient to fetch, the built-in lithium battery can be used for short-time export verification.
The main software flow of the software program module is as follows:
1. the system is initialized to carry out self-checking, 16 LED lamps 1 are lightened, a power-on initial picture is displayed, the time delay is about 3 seconds, the 16 LED lamps 1 are turned off, and a main picture is displayed.
2. Entering a main loop, and detecting the branch of the switch-case statement: (1) whether the up-turn key 4 is pressed down or not, (2) whether the down-turn key 4 is pressed down or not, (3) whether the key 4 is pressed down or not is confirmed, (4) whether the reset key 4 is pressed down or not, (5) whether an AD sampling mark comes (1 ms comes once), and (6) whether a round of verification end mark comes (30 seconds after reset pressing) or not are shown in fig. 11 in detail.
In summary, the beneficial effects of this embodiment are:
(1) the utility model has the advantages that the utility model does not need to rely on human eyes and universal meter observation, and when multi-outlet calibration is carried out, auxiliary instruments are greatly reduced, and the test process is simplified; the method avoids the detection misalignment caused by the error of the test result due to the inherent delay of the instrument when a plurality of multimeters acquire simultaneously.
(2) The utility model discloses the inspection instrument adopts the outlet voltage acquisition circuit, can carry out many outlet voltage's collection simultaneously, carries out the isolation of transmission course through the opto-coupler, and transmission discerns, judges to microprocessor, falls to interference factor minimumly, has saved the people in the middle of moreover and has observed the judgement link, improves the degree of accuracy of testing process.
(3) When the traditional method is used for outlet verification, at least two persons are needed for the verification; wherein one person carries out the output of relaying the tester, and one person connects universal meter pen to observe the change of universal meter registration. The utility model discloses the design of inspection instrument adoption integration, the potential detection of each export clamp plate is independently accomplished to the export check gauge, through the inside procedure of microprocessor, realizes the judgement of each clamp plate action order, carries out real-time demonstration through liquid crystal display 3 and LED lamp 1.
(4) The utility model discloses the time that the check instrument began to this stage of clamp plate output from the transmission with the help of the inside time-recorder of microprocessor is calculated, reaches the purpose of checking with device definite value setting, has further improved the reliability of device operation.
(5) The utility model discloses the outlet voltage acquisition circuit that inspection instrument adopted, when carrying out the protection device export check-up of two sets of DC power supply difference power supplies simultaneously, can not induce "direct current closes the ring" trouble, the check-up process can not influence the direct current system normal operating of transformer substation.
(6) The shell 2 of the device panel adopts the aluminum-magnesium alloy shell 2, so that the device panel has strong anti-electromagnetic interference capability and improves the stability of the device.
Example two
A calibration method based on the relay protection device outlet calibration instrument comprises the following steps:
(1) the outlet voltage acquisition circuit divides the high resistance in the circuit, reduces the influence of the acquisition circuit on a signal source, and ensures the integrity of the signal to the greatest extent;
(2) and (3) utilizing the optical coupling isolation to transmit to a microprocessor for operation judgment: the microprocessor carries out coefficient calculation on the acquired analog signals through a self-contained analog quantity acquisition channel, finally obtains the voltage at the lower end of the pressing plate in the action process, judges whether the checked outlet voltage is in a normal setting range, and sends out a signal to drive a buzzer control circuit to give an alarm if the checked outlet voltage is not in the normal setting range;
(3) the microprocessor counts by using an internal timer, and performs logical operation and sequencing on a plurality of detection channel values transmitted by the optical coupling isolation circuit to obtain the action time and the action sequence of the plurality of pressing plates;
(4) the LED lamp 1 is driven to realize the synchronous lighting of the logical operation result and the corresponding LED lamp 1 bead; and simultaneously controlling the liquid crystal screen to display the condition of the current acquisition channel, comprising the following steps: the time of the action, the sequence of the action, and the voltage in real time;
(5) and resetting the test result, resetting the test result in the current round, and carrying out second test preparation in the next round.
In the step (1), when the signal input impedance is greater than 10 megohms, high-impedance voltage division is carried out.
The microprocessor is an STM32F103 singlechip and has the following functions: analog quantity sampling, internal calculation, data storage, clock reading, logic judgment, signal output, liquid crystal display, LED display driving and fault judgment output.
The LED driving display circuit is used for synchronously displaying whether the outlet pressing plate acts in real time and is driven by a Darlington power tube, and a 'common cathode' connection method is adopted; after the detection is started, the LED lamp 1 bead is kept normally on through self-locking, and is extinguished to wait for the next round of test after resetting.
The microprocessor and the buzzer are connected through a triode.
In summary, the beneficial effects of this embodiment are:
(1) the use of the high-resistance matched operational amplifier and the application of optical coupling isolation in the transmission process ensure the integrity of signals to the maximum extent and ensure the accuracy of signal acquisition from the source;
(2) the whole process of potential change of the lower end of the pressure plate in the transmission process is accurately recorded by means of a timer in the microprocessor, the action sequence of the protection pressure plate is accurately judged, the hidden danger of artificial error checking and judgment is avoided, and the operation reliability of the protection device is improved;
(3) by adopting the integrated design and one-key operation, the labor input is greatly reduced, the intermediate links are reduced, and the time consumption of the export verification link is greatly shortened, so that the time consumption of the whole protection regular inspection is shortened, and according to statistics, the average time consumption of the instrument for completing all export verification links of a group of 220kV transformer protection devices is 1.9 hours, compared with the traditional mode, the average time saving is 1.7 hours.
(4) The logic judgment adopts a 'protection outlet node action judgment algorithm' initiated in the industry, the outlet node action judgment algorithm is creatively developed by software simulation and machine simulation with the help of high processing speed of a microprocessor, the sequence of each outlet action is accurately judged, the blank of the industry is filled, precious experience is provided for subsequent continuous development and application, and the method has strong reference significance.
In short, the protection device outlet calibrator of the utility model adopts an integrated design, which can greatly reduce the participation of maintainers, and adopts a one-key operation to shorten the middle redundant link and reduce the interference factors; the high-precision acquisition and high-efficiency operation judgment are realized by the aid of the microprocessor, redundant test operation times are omitted, the test time is greatly shortened, and the accuracy of the detection process is improved; an alarm loop is added to test the change of the voltage of the direct current system in the whole detection station; and checking the outlet potential and time to improve the operation reliability of the protection device.
The above description is only the specific embodiment of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can replace or change the technical solution of the present invention and the inventive concept thereof within the technical scope of the present invention.
Claims (6)
1. An outlet calibration instrument of a relay protection device is characterized by comprising a shell, and a power supply circuit, an outlet voltage acquisition circuit, a signal transmission isolation circuit, a central processing unit, an LED driving display circuit, a liquid crystal display circuit, a buzzer alarm circuit and a key input circuit which are arranged in the shell; the output voltage acquisition circuit, the signal transmission isolation circuit and the central processing unit are sequentially connected, the central processing unit is also respectively connected with the LED driving display circuit, the liquid crystal display circuit, the buzzer alarm circuit, the key input circuit and the power circuit, and the power circuit is also respectively connected with the LED driving display circuit, the liquid crystal display circuit and the buzzer alarm circuit; and the operating panel of the shell is provided with a power switch, a grounding terminal plug, an alternating current input plug, a test button, a liquid crystal display screen, an LED lamp and a plurality of paths of detection input terminals for connecting the lower end of the outlet pressing plate.
2. The calibration instrument of claim 1, wherein said central processing unit includes a microprocessor and a filter circuit for performing logic algorithm processing of the collected signals and controlling of the LED driving display circuit, the liquid crystal display circuit, the buzzer alarm circuit; the microprocessor includes a timer.
3. A verification instrument as claimed in claim 1, wherein said power circuit includes a power switch, an AC output interface and an AC/DC module for adapting the required power for instrument conversion.
4. The prover of claim 1 wherein the outlet voltage acquisition circuit includes a voltage divider resistor and an operational amplifier for coupling the divided signal source to the microprocessor.
5. The checking instrument according to claim 1, wherein the key input circuit includes four keys using a "common negative" connection, a "confirm" key for opening or closing any one of the detection channels, an "flip up" key and a "flip down" key for switching the detection channels back and forth, and a "reset" key for clearing the detection result.
6. The calibration instrument of claim 1, wherein said signal transmission isolation circuit is an opto-isolator circuit comprising a current limiting resistor and an opto-isolator loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921630113.4U CN211426651U (en) | 2020-06-16 | 2020-06-16 | Relay protection device export check-up instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921630113.4U CN211426651U (en) | 2020-06-16 | 2020-06-16 | Relay protection device export check-up instrument |
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| CN211426651U true CN211426651U (en) | 2020-09-04 |
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| CN201921630113.4U Expired - Fee Related CN211426651U (en) | 2020-06-16 | 2020-06-16 | Relay protection device export check-up instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609190A (en) * | 2019-11-12 | 2019-12-24 | 国网宁夏电力有限公司石嘴山供电公司 | Relay protection device outlet checking instrument and method thereof |
| CN112731125A (en) * | 2020-12-03 | 2021-04-30 | 广东电网有限责任公司 | System and method for detecting action exit time of protection device |
-
2020
- 2020-06-16 CN CN201921630113.4U patent/CN211426651U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110609190A (en) * | 2019-11-12 | 2019-12-24 | 国网宁夏电力有限公司石嘴山供电公司 | Relay protection device outlet checking instrument and method thereof |
| CN112731125A (en) * | 2020-12-03 | 2021-04-30 | 广东电网有限责任公司 | System and method for detecting action exit time of protection device |
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