CN106324407B - Detector for secondary resonance elimination device of voltage transformer - Google Patents
Detector for secondary resonance elimination device of voltage transformer Download PDFInfo
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- CN106324407B CN106324407B CN201610861638.3A CN201610861638A CN106324407B CN 106324407 B CN106324407 B CN 106324407B CN 201610861638 A CN201610861638 A CN 201610861638A CN 106324407 B CN106324407 B CN 106324407B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The detector for the secondary harmonic elimination device of the voltage transformer consists of seven units including a panel, a storage unit, a control power supply unit, a digital processor unit, a harmonic generation unit, an output switching and interface, a detection unit and a protection unit. The panel and the storage unit comprise an upper computer processor unit, a USB interface, a data storage, a display screen and a keyboard; the harmonic generation unit comprises a D/A conversion and amplification module, a power amplification bus voltage unit, a fundamental wave power amplification module and a harmonic power amplification module. The invention can simulate faults such as resonance, grounding, overvoltage and the like of a power grid of 35kV or below in a high-precision, rapid and safe manner, and can rapidly test the functions of eliminating resonance, grounding, overvoltage alarming and the like of the PT secondary resonance eliminating device, thereby effectively solving the problems of easy damage to a tester, potential safety hazard, difficult test and the like of the traditional method.
Description
Technical Field
The invention relates to a detector for a secondary harmonic elimination device of a voltage transformer, and belongs to the field of detection of secondary equipment of a power system.
Background
At present, a PT (potential transformer) secondary harmonic elimination device is used as one of two harmonic elimination core devices of a rural power network transformer substation, and good service performance is an important condition for guaranteeing power supply quality and stability of the rural power network transformer substation. But the transformer substation is not lack of accidents caused by damage of the PT secondary harmonic elimination device. If the 10kV#4 bus PT of the xx transformer substation burns out on the 27 th month 12 of 2015, and the PT resonance is found through investigation, the resonance voltage does not reach the primary harmonic eliminator starting value, and the secondary harmonic eliminator is damaged and cannot eliminate the grid resonance. At present, the function test of the PT secondary harmonic elimination device adopts the traditional test method of the addition of a relay protection tester, the existence test transient resonance current is overlarge, the relay protection tester is easy to damage, and the personnel safety is possibly even influenced. Therefore, the traditional inspection method has the problems of easy damage to the tester, potential safety hazard, difficult test and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-precision, rapid and safe detector for a secondary harmonic elimination device of a voltage transformer, which can simulate faults such as resonance, grounding, overvoltage and the like of a power grid of 35kV or below, rapidly test the functions of harmonic elimination, grounding, overvoltage alarming and the like of a PT secondary harmonic elimination device and ensure the stable and reliable operation of the PT secondary harmonic elimination device. The problems of easy damage to the tester, potential safety hazard, difficult test and the like in the traditional method are effectively solved.
The technical scheme adopted by the invention is as follows;
the detector for the secondary harmonic elimination device of the voltage transformer comprises a panel, a storage unit, a control power supply unit, a digital processor unit, a harmonic generation unit, an output switching and interface, a detection unit and a protection unit. The panel and the storage unit comprise an upper computer processor unit, a USB interface, a data memory, a display screen and a keyboard. The upper computer processor unit is respectively connected with the USB interface, the data memory, the display screen and the keyboard. The control power supply unit is respectively connected with the upper computer processor unit and the digital processor unit. The digital processor unit is respectively connected with the upper computer processor unit, the detection unit and the protection unit, receives signals of the units, and sends information to the upper computer processor unit and the D/A conversion and amplification unit after signal processing is completed.
The harmonic generation unit comprises a D/A conversion and amplification module, a power amplification bus voltage unit, a fundamental wave power amplification module and a harmonic power amplification module; the D/A conversion and amplification module is connected with the digital processor unit and the fundamental wave power amplification module, the harmonic wave power amplification module is used for completing D/A conversion and amplification of harmonic waves, and the power amplification bus voltage unit is used for respectively sending signals to the fundamental wave power amplification module and the harmonic wave power amplification module; the fundamental wave power amplification module receives the signals of the D/A conversion and amplification module and sends signals to the output switching and interface; the harmonic power amplifying module receives the signals of the D/A conversion and amplifying module and sends signals to the output switching and interface.
The output switching and interface is respectively connected with the fundamental wave power amplification module and the harmonic wave power amplification module, receives instructions of the fundamental wave power amplification module and the harmonic wave power amplification module, provides feedback signals for the detection unit and the protection unit, and provides test quantity for the PT secondary harmonic elimination device.
The detecting unit is connected with the output switching and interface, detects and outputs a voltage and current change detecting signal sent by the switching and interface, and sends an instruction to the digital processor unit.
The protection unit is connected with the output switching and interface, receives protection signals sent by the output switching and interface, and sends instructions to the digital processor unit.
The upper computer processor unit is connected with a USB interface, and the USB interface is used for copying test data;
the upper computer processor unit is connected with the data memory, and the data memory is used for storing test data in real time;
the upper computer processor unit is connected with a display screen, and the display screen is used for displaying voltage conditions, frequency and test results in real time;
the upper computer processor unit is connected with a keyboard, and the keyboard edits test conditions.
Compared with the prior art, the detector for the secondary harmonic elimination device of the voltage transformer has the remarkable advantages and positive effects:
1. the protection unit can accurately protect the tester and the PT secondary harmonic elimination device, and avoid the phenomenon that the tester and the PT secondary harmonic elimination device are burnt out due to overcurrent when the PT secondary harmonic elimination device generates large current at the moment of resonance in the conventional test;
2. the fundamental wave output voltage is 0-200V, the current is 0-2A, the harmonic wave output voltage is 0-50V, and the current is 0-16A, and the fundamental wave generation part and the harmonic generation part are adopted to automatically switch, so that the optimization of the power supply power of the harmonic generation unit is required when the fundamental frequency, the frequency division and the frequency multiplication are respectively corresponding to different action voltages can be optimally checked.
3. The invention can quickly and automatically check the action condition of the secondary harmonic elimination device within 1s, and automatically judge whether the function of the secondary harmonic elimination device is correct.
4. The invention has small appearance size, light weight and intelligent operation, and is convenient for individual soldiers to carry and overhaul.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The technical scheme of the present invention will be further described by the following detailed description of the present invention with reference to fig. 1. It should be noted that the principle of eliminating the PT secondary eliminating device 9 of a certain type listed in the following embodiments meets the requirements of the PT secondary eliminating device of the current power system, and is more general.
Different types of PT secondary harmonic elimination devices are adopted to judge the size of 3U0 under different frequencies. The principle of the resonance elimination device is as follows:
resonance criterion: 17HZ harmonic voltage is more than or equal to 17V,25HZ harmonic voltage is more than or equal to 25V, and 150HZ harmonic voltage is more than or equal to 33V;
ground criterion: the fundamental voltage is more than or equal to 30V;
overpressure criteria: the fundamental voltage is more than or equal to 120V.
As shown in fig. 1, the detector for the secondary harmonic elimination device of the voltage transformer comprises a tester shell 1, a panel and storage unit 2, a control power supply unit 3, a digital processor unit 4, a harmonic generation unit 5, an output switching and interface 6, a detection unit 7 and a protection unit 8,
the panel and storage unit 2 comprises an upper computer processor unit 21, a USB interface 22, a data memory 23, a display screen 24 and a keyboard 25.
The upper computer processor unit 21 is respectively connected with the USB interface 22, the data memory 23, the display screen 24 and the keyboard 25.
The control power supply unit 3 is connected to the host processor unit 21 and the digital processor unit 4, respectively.
The digital processor unit 4 is respectively connected with the upper computer processor unit 21, the detection unit 7 and the protection unit 8, and the digital processor unit 4 receives signals of the units and sends information to the upper computer processor unit 21 and the D/A conversion and amplification unit 51 after finishing signal processing.
The harmonic generation unit 5 comprises a D/A conversion and amplification module 51, a power amplification bus voltage unit 52, a fundamental wave power amplification module 53 and a harmonic power amplification module 54; the D/A conversion and amplification module 51 is connected with the digital processor unit 4 and the fundamental wave power amplification module 53, the harmonic wave power amplification module 54 is used for completing D/A conversion and amplification of harmonic waves, and the power amplification bus voltage unit 52 is used for respectively sending signals to the fundamental wave power amplification module 53 and the harmonic wave power amplification module 54; the fundamental wave power amplification module 53 receives the signal of the D/a conversion and amplification module 51 and transmits a signal to the output switching and interface 6; the harmonic power amplification module 54 receives the signal of the D/a conversion and amplification module 51 and transmits the signal to the output switching and interface 6.
The output switching and interface 6 is respectively connected with the fundamental wave power amplification module 53 and the harmonic wave power amplification module 54, and the output switching and interface 6 receives the instructions of the fundamental wave power amplification module 53 and the harmonic wave power amplification module 54, provides feedback signals for the detection unit 7 and the protection unit 8, and provides test amounts for the PT secondary harmonic elimination device 9.
The detecting unit 7 is connected with the output switching and interface 6, and the detecting unit 7 detects the voltage and current change detecting signal sent by the output switching and interface 6 and sends out an instruction to the digital processor unit 4.
The protection unit 8 is connected with the output switching and interface 6, and the protection unit 8 receives the protection signal sent by the output switching and interface 6 and sends out an instruction to the digital processor unit 4.
The upper computer processor unit 21 is connected with the USB interface 22, and the USB interface 22 is used for copying test data.
The upper computer processor unit 21 is connected with a data memory 23, and the data memory 23 is used for storing test data in real time.
The upper computer processor unit 21 is connected with a display screen 24, and the display screen 24 is used for displaying voltage conditions, frequency and test results in real time.
The upper computer processor unit 21 is connected with a keyboard 25, and the keyboard 25 edits test conditions.
Wherein:
the upper computer processor unit 21 comprises a microprocessor STM32F103VET6, and the microprocessor STM32F103VET6 is connected with
Communication chip MAX3221CDBR, USB chip CH376S.
The data memory 23 includes: the memory unit SST39VF6401-70-4I-EK, junction field effect transistor IS62C256AL-45UL and three terminal voltage regulator chip NCP1117DT33RKG.
The display screen 24 adopts QPY6448-056-NN09L, and the display screen 24 is connected with the control chip RA8835AP3N and the data processing chip MAX3221CDBR.
The control power supply unit 3 is formed by connecting a buck-boost converter TPS63020DJSR and a direct current-direct current converter NCV3163 PW.
The digital processor unit 4 is composed of a DSP processor TMS320F2808PZA, an integrated circuit XC9572TQ100AMM-10C and an integrated circuit TCM809RENB 713.
The D/a conversion and amplification module 51 is composed of a DAC7644E and a comparator chip OP 07C.
The power amplifier busbar voltage unit 52 is composed of a rectifier bridge GBJ2510, a rectifier bridge KBP310, a KBU810 and a voltage stabilizing chip LM 317.
The fundamental wave power amplification module 53 is composed of a power field effect transistor IRFP460, a budget amplifier OPA277, and an amplifier chip INA 132.
The harmonic power amplification module 54 is composed of an IXTQ36N50P, a triode J5027 and an A1156 chip;
the output switch and interface 6 is composed of a singlechip AT89C2051, ULN2003AG4 and a relay 951-2C-24D chip.
The detection unit 7 is constituted by an LM393P, a comparator chip OP07C, and an optocoupler TLP 181.
The protection unit 8 is constituted by a transistor 2N5551 and a CMOS chip 74HC 32.
The implementation steps are as follows:
on the panel and the storage unit 2 of the device, the initial amplitude, cut-off amplitude, amplitude variation, frequency and other parameters of the required generated voltage 3U0 are set through the keyboard 25, displayed on the display screen 24, stored in the data memory 23, and converted into digital signals through the upper computer processor unit 21 to be transmitted to the digital processor unit 4. The digital processor unit 4 performs digital processing such as recognition, superposition, and conversion on the signal, and transmits the signal to the harmonic generation unit 5. The D/a conversion and amplification module 51 of the harmonic generation unit 5 converts the digital signal into an analog signal, and performs preliminary amplification of the signal; the fundamental wave power amplification module 53 is used for amplifying the power of the input fundamental wave signal, the harmonic power amplification module 54 can be used for amplifying the power of the input harmonic signal, and the power amplification bus voltage unit 52 is used for ensuring that the output power supply is a stable voltage source meeting different frequencies;
the output switching and voltage switching relay of the interface 6 switches the stabilized voltage sources with different frequencies through the voltages of fundamental frequency, frequency division and frequency multiplication, and the switched voltages act on the PT secondary harmonic elimination device 9. When the resonance, grounding and overvoltage function criteria of the PT secondary resonance elimination device 9 are reached, the PT secondary resonance elimination device 9 acts on resonance elimination elements to generate larger instantaneous short-circuit current, and meanwhile, the voltages at two ends of the PT secondary resonance elimination device 9 are changed.
The detection unit 7 detects and outputs signals of the voltage change rate and the current change rate at the switching and interface 6, and transmits the signals to the digital processor unit 4, and the digital processor unit 4 transmits the signals to the harmonic generation unit 5 to stop harmonic generation after processing, and transmits the collected voltage change signals and the processing results to the panel and the storage unit 2 to display and store.
After the PT secondary harmonic elimination device 9 harmonic elimination element acts, the protection unit 8 is quickly connected into a large resistor, eliminates the impact of instantaneous short-circuit current, and avoids burning the tester and the PT secondary harmonic elimination device 9.
The panel and the USB interface 22 in the storage unit 2 adopt a USB3.0 interface for copying test data.
Claims (2)
1. The utility model provides a voltage transformer secondary harmonic elimination device detector, includes panel and storage unit (2), control power supply unit (3), digital processor unit (4), harmonic generation unit (5), output switch and interface (6), detecting element (7), protection element (8), its characterized in that:
the panel and storage unit (2) comprises an upper computer processor unit (21), a USB interface (22), a data memory (23), a display screen (24) and a keyboard (25);
the upper computer processor unit (21) is respectively connected with the USB interface (22), the data memory (23), the display screen (24) and the keyboard (25);
the control power supply unit (3) is respectively connected with the upper computer processor unit (21) and the digital processor unit (4);
the digital processor unit (4) is respectively connected with the upper computer processor unit (21), the detection unit (7) and the protection unit (8), the digital processor unit (4) receives signals of the units, and after signal processing is finished, information is sent to the upper computer processor unit (21) and the D/A conversion and amplification module (51);
the harmonic generation unit (5) comprises a D/A conversion and amplification module (51), a power amplification bus voltage unit (52), a fundamental wave power amplification module (53) and a harmonic power amplification module (54); the D/A conversion and amplification module (51) is connected with the digital processor unit (4) and the fundamental wave power amplification module (53), the harmonic wave power amplification module (54) is used for completing D/A conversion and amplification of harmonic waves, and the power amplification bus voltage unit (52) is used for respectively sending signals to the fundamental wave power amplification module (53) and the harmonic wave power amplification module (54); the fundamental wave power amplifying module (53) receives the signals of the D/A conversion and amplifying module (51) and sends signals to the output switching and interface (6); the harmonic power amplification module (54) receives the signal of the D/A conversion and amplification module (51) and sends the signal to the output switching and interface (6);
the output switching and interface (6) is respectively connected with the fundamental wave power amplification module (53) and the harmonic wave power amplification module (54), the output switching and interface (6) receives the instructions of the fundamental wave power amplification module (53) and the harmonic wave power amplification module (54), provides feedback signals for the detection unit (7) and the protection unit (8), and simultaneously provides test quantity for the PT secondary harmonic elimination device (9);
the detection unit (7) is connected with the output switching and interface (6), and the detection unit (7) detects a voltage and current change detection signal sent by the output switching and interface (6) and sends an instruction to the digital processor unit (4);
the protection unit (8) is connected with the output switching and interface (6), and the protection unit (8) receives the protection signal sent by the output switching and interface (6) and sends out an instruction to the digital processor unit (4);
the panel and the storage unit (2) of the device are provided with initial amplitude, cut-off amplitude, amplitude variation and frequency magnitude parameters of the required generated voltage through a keyboard (25), the initial amplitude, cut-off amplitude, amplitude variation and frequency magnitude parameters are displayed on a display screen (24), stored in a data memory (23), converted into digital signals through an upper computer processor unit (21) and transmitted to a digital processor unit (4), and the digital processor unit (4) carries out recognition, superposition and digital conversion processing on the signals and transmits the signals to a harmonic generation unit (5); the D/A conversion and amplification module (51) of the harmonic generation unit (5) converts a digital signal into an analog signal and performs preliminary amplification of the signal; the fundamental wave power amplification module (53) is used for amplifying the power of the input fundamental wave signals, the harmonic power amplification module (54) can be used for amplifying the power of the input harmonic signals, and the power amplification bus voltage unit (52) is used for ensuring that the output power supply is a stable voltage source meeting different frequencies; the voltage switching relay of the output switching and interface (6) switches the voltage of the stable voltage sources with different frequencies through the voltage of fundamental frequency, frequency division and frequency multiplication, and the switched voltage acts on the PT secondary harmonic elimination device (9); when the resonance, grounding and overvoltage function criteria of the PT secondary resonance elimination device (9) are reached, the PT secondary resonance elimination device (9) acts on the resonance elimination element to generate larger instantaneous short-circuit current, and meanwhile, the voltages at two ends of the PT secondary resonance elimination device (9) are also changed; the detection unit (7) is used for detecting signals of voltage change rate and current change rate at the output switching and interface (6), transmitting the signals to the digital processor unit (4), and transmitting the signals to the harmonic generation unit (5) to stop harmonic generation after the digital processor unit (4) processes the signals, and transmitting the acquired voltage change signals and processing results to the panel and the storage unit (2) for display and storage; after the PT secondary harmonic elimination device (9) acts, the protection unit (8) is quickly connected into a large resistor, eliminates the impact of instantaneous short-circuit current, and avoids burning the tester and the PT secondary harmonic elimination device (9).
2. The voltage transformer secondary harmonic elimination device detector according to claim 1, wherein: the upper computer processor unit (21) is connected with the USB interface (22), and the USB interface (22) is used for copying test data; the upper computer processor unit (21) is connected with the data memory (23), and the data memory (23) is used for storing test data in real time; the upper computer processor unit (21) is connected with the display screen (24), and the display screen (24) is used for displaying the voltage condition, the frequency and the test result in real time; the upper computer processor unit (21) is connected with a keyboard (25), and the keyboard (25) edits test conditions.
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| CN201610861638.3A CN106324407B (en) | 2016-09-28 | 2016-09-28 | Detector for secondary resonance elimination device of voltage transformer |
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| CN201610861638.3A CN106324407B (en) | 2016-09-28 | 2016-09-28 | Detector for secondary resonance elimination device of voltage transformer |
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| CN106324407B true CN106324407B (en) | 2023-07-25 |
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| CN108614174A (en) * | 2018-06-11 | 2018-10-02 | 国网湖北省电力有限公司孝感供电公司 | The tester and test system of secondary resonance elimination device |
| CN110895297A (en) * | 2019-12-08 | 2020-03-20 | 国网河南省电力公司洛阳供电公司 | Performance detection device for voltage transformer resonance elimination device |
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