CN114280392A - Main transformer simulation load test system - Google Patents
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Abstract
The invention discloses a main transformer simulation on-load test system which comprises an outdoor unit system and two test terminals, wherein the outdoor unit system inputs AC 0-420V/10A power supply signals to terminals A, B, C and N of a high-voltage side of a transformer, one of the two test terminals tests the secondary current value of a high-voltage side CT of the transformer, and the other test terminal tests the secondary current value of a low-voltage side CT of the transformer. The invention realizes the simulation load-carrying test of the main transformer of the transformer substation and the power plant, automatically judges whether the differential protection wiring is correct, does not need the high-voltage side of the main transformer to carry high-voltage in the test process, simplifies the procedure of applying for power transmission and ensures the safety of the test. The invention realizes that the main transformer does not need to carry actual load in the process of simulating the on-load test, and avoids the problem of power failure possibly brought to a load circuit.
Description
The technical field is as follows:
the invention relates to a main transformer simulation on-load test system.
Background art:
the main transformer of transformer substation is as power system's voltage conversion equipment, in case take place to destroy in the operation process, overhauls the degree of difficulty very big, not only can directly influence user's power consumption quality, still can consume a large amount of manpower, material resources, causes serious economic loss.
The differential protection is used as the main protection of the transformer, and can reflect the electric quantity fault and make judgment to select tripping operation at the first time, so that the fault is removed, and the normal operation of the transformer is ensured.
According to the requirements of 'inspection regulations of relay protection and automatic devices', for main transformer protection with new installation or secondary circuit change, load test must be carried out on transformer differential protection by using load current and system working voltage, and the purpose is to inspect whether the electrical characteristics of the protection device and the wiring of the alternating current secondary circuit are correct, namely, whether the wiring of the differential protection is correct.
The Chinese patent application with the application number of 2018114997697 discloses a high-impedance transformer simulation loaded through-current test device and a test method, which comprises an electronic three-phase broadband power supply, a three-phase large current generator and a broadband wireless phase remote measuring device; the output end of the electronic three-phase broadband power supply is connected with a three-phase power frequency heavy current booster, and the three-phase power frequency heavy current of the booster consists of three isolation transformers with the same specification and model; before measurement, time calibration is carried out on a host machine and an extension machine of the broadband wireless telemetering phase device, power frequency through flow and low frequency through flow are carried out, and the correctness of a differential protection hexagonal diagram is detected; measuring the transformation ratio, judging the correctness of the transformation ratio and the polarity and carrying out differential flow operation; the system is ensured to operate safely and stably, and the success rate of one-time operation is improved.
The load test of the current main transformer is carried out in the process of the operation of the main transformer, namely the test is carried out under the real actual operation condition, if the high-voltage side of the main transformer needs to be connected with alternating voltage, the medium-voltage side or the low-voltage side of the main transformer needs to be provided with actual load, the operation is complex, the high-voltage side needs to be connected with the alternating voltage, the safety is low, and the secondary circuit is easy to be opened when the alternating current is measured. If the wiring of the main transformer protection circuit has errors, the main transformer is required to be powered off, and then the secondary circuit is checked and debugged repeatedly, so that the efficiency is very low.
In summary, the current main transformer load test has the following problems:
1. testing after the main transformer is put into operation is required, and the main transformer can be put into operation with faults;
2. the actual load is required, the problem that the load is too small to accurately measure exists in a station which is put into operation at the beginning, and the condition that the line load is tripped and loses power exists at the same time;
3. after the traditional method is used for measuring by using a three-phase voltammeter, a vector diagram is drawn manually, the operation is complex, and human judgment errors are easily caused. In addition, merging units on all sides of a main transformer in the intelligent station are distributed, the spacing distance is long, and the problem of high synchronous measurement difficulty exists.
The invention content is as follows:
in order to overcome the defects of the prior art, the invention aims to provide a main transformer simulation on-load test system, which realizes the simulation on-load test before the operation of main transformers of transformer substations and power plants and has the function of detecting whether the differential protection wiring of the main transformer is correct or not.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a main transformer simulation on-load test system comprises an outdoor unit system and two test terminals, wherein the outdoor unit system inputs AC 0-420V/10A power supply signals to terminals A, B, C and N of a high-voltage side of a transformer, one of the two test terminals tests the secondary current value of a transformer high-voltage side CT, and the other test terminal tests the secondary current value of a transformer low-voltage side CT.
Preferably, the outdoor unit system further includes:
the system comprises a microcontroller, a control terminal connected with the microcontroller and a first wireless module;
the electric voltage regulator is connected with an input power supply, and a voltage regulation control module of the electric voltage regulator is connected with the microcontroller;
the three-phase boosting current booster is connected with the electric voltage regulator, and the output end of the three-phase boosting current booster is connected with the high-voltage side of the transformer;
the voltage-current converter is secondarily connected with the microcontroller and the transformer high-voltage side mutual inductor;
each of the test terminals includes:
the display device comprises a second microcontroller, a display terminal connected with the second microcontroller and a second wireless module, wherein the second wireless module is communicated with the first wireless module;
the second voltage-current converter is secondarily connected with the second microcontroller and the transformer low-voltage side transformer;
and the input terminal is connected with the second microcontroller.
Preferably, the control terminal is a seven-inch touch screen, and is connected with the microcontroller through a UART1 serial port; the first wireless module is a 2.4G wireless communication module and is connected with the microcontroller through a UART2 serial port; the voltage regulating control module of the electric voltage regulator is connected with the microcontroller through a PWM interface; the voltage-current converter is connected with the microcontroller through an FSMC interface through a six-channel 16-bit synchronous sampling module of the voltage-current converter.
Preferably, the display terminal is a 3.5-inch display screen, and is connected with the second microcontroller through a UART1 serial port and used for displaying the measurement result; the second wireless module is a 2.4G wireless communication module and is connected with the second microcontroller through a UART2 serial port; the second voltage-current converter is connected with the microcontroller through an FSMC interface through a six-channel 16-bit synchronous sampling module; the input terminal is a 3 x 3 matrix keyboard, is connected with the second microcontroller through a GPIO interface, and is used for inputting user information and controlling a test process.
Compared with the prior art, the invention has the beneficial effects that:
the invention is not only suitable for the test of the conventional transformer substation but also suitable for the test of the intelligent transformer substation, and solves two problems of the load test of the current main transformer: firstly, need main transformer high pressure side power transmission, secondly need actually take power load, avoided the main transformer probably to exist take trouble to put into operation scheduling problem.
The main transformer simulation on-load test system provided by the invention can be used for completing the transformer simulation on-load test before the main transformer is put into operation, so that whether the differential protection wiring of the transformer is correct or not is checked. The system consists of an outdoor unit power supply and two measuring terminals, the communication of each part is realized by a wireless communication module, the distributed phase synchronization measuring function is realized by adopting an improved TPSN (time synchronization protocol) algorithm, when the system is used for carrying out transformer simulation on-load test, a main transformer is not needed to be put into operation, the problem of on-load operation with faults is avoided, an actual load is not needed, the problems of small load current and inaccurate test are avoided, and the whole test process is completed fully automatically. The system has powerful functions and is perfectly suitable for the requirements of simulating the load test of the main transformer of the conventional transformer substation and the intelligent transformer substation.
The invention realizes the simulation load-carrying test of the main transformer of the transformer substation and the power plant, automatically judges whether the differential protection is correct, does not need the high-voltage side of the main transformer to carry high-voltage in the test process, simplifies the procedure of applying for power transmission and ensures the safety of the test. The invention realizes that the main transformer does not need to carry actual load in the process of simulating the on-load test, thereby avoiding the problem of power failure possibly brought to a load circuit; the invention realizes the automatic discrimination of the differential protection wiring, the test process is fully automatic, and the test result is displayed in a chart form, so that the test is visual and clear.
Description of the drawings:
fig. 1 is a connection diagram of components of an outdoor unit.
Fig. 2 is a composition structure diagram of a measurement terminal.
The present invention will be further described with reference to the following detailed description and accompanying drawings.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings 1 and 2, the invention realizes the function of load test of the main transformer, the test system can automatically judge whether the main transformer differential protection wiring is correct, and meanwhile, the power transmission at the high-voltage side of the main transformer is not needed in the test process.
The testing system of the invention consists of an outdoor unit system and two measuring terminals, wherein the outdoor unit system and the two measuring terminals are communicated by using a wireless module, and the synchronous measurement is realized by adopting an improved TPSN (time synchronization protocol) algorithm. The outdoor unit power supply has three-phase AC420V voltage output and maximum current of 10A, the machine can control the voltage amplitude of the three-phase AC output, the maximum output voltage is AC420V, the internal structures of the two measurement terminals are completely the same, and the two measurement terminals have three-phase voltage and three-phase current testing functions. The voltage testing range is 1-420V AC, the current testing range is 2mA-5A, and the testing precision can reach 0.5% in full range. When the load test is simulated, the three-phase current clamp is used for detecting the secondary current value of the main transformer CT, the secondary circuit of the CT does not need to be disconnected, the operation is simple, and the danger of the open circuit of the CT does not exist. When the simulation is tested with load, the outdoor unit power supply is a main control machine, and the main control machine controls the output of the machine to adjustable A, B and C (maximum voltage AC420V and maximum current AC10A) three-phase voltage to the A, B and C ends of the high-voltage side of the transformer, so that the test with a neutral point or without the neutral point of a main transformer is supported. The outdoor unit outputs voltage, and simultaneously reads currents of two slave units through the wireless communication module, one of the two slave units detects a CT secondary current value of a high-voltage side of the main transformer, the other slave unit detects a CT secondary current value of a low-voltage side of the main transformer, and in the testing process, the low-voltage sides of the main transformer are mutually short-circuited. The outdoor unit obtains the amplitude and the phase of the secondary current values IA, IB and IC of the high-voltage side CT and the amplitude and the phase of the secondary current values Ia, Ib and IC of the low-voltage side CT which are synchronously tested by the two measuring terminals, and automatically judges whether the wiring of the main transformer differential protection of the outdoor unit is correct or not according to a mathematical model.
In the work, the voltage regulation control module controls the positive rotation and the negative rotation of a control motor on the electric voltage regulator, so that the output voltage of the electric voltage regulator is increased or reduced. Meanwhile, the electric voltage regulator detects whether the electric voltage regulator reaches a lower limit or an upper limit, so that the step-down or the step-up is determined to be stopped. The electric voltage regulator is controlled by the voltage regulation control module and outputs a controllable power supply signal; the three-phase boost current booster converts the output of the electric voltage regulator into three output signals of 0-420V/10A, 0-600A/5V and 0-2500V/1A respectively. The method is used for the main transformer simulation on-load test.
In the working process, an outdoor unit power supply is responsible for inputting AC 0-420V/10A power supply signals to terminals A, B, C and N of a high-voltage side of a transformer, two measuring terminals detect the secondary current value of a CT of the transformer, one test transformer is used for testing the secondary current value of the CT of the high-voltage side of the transformer, one test transformer is used for testing the secondary current value of the CT of the low-voltage side of the transformer, an outdoor unit power supply system serves as a main control and is responsible for starting testing and reading the test values of the two measuring terminals and judging the current wiring type of the transformer, so that whether the differential protection wiring of the transformer is correct or not is judged, the outdoor unit power supply is used, and communication between the two measuring terminals is realized through a 2.4G wireless communication module. And a modified TPSN (time synchronization protocol) algorithm is used on software to realize synchronous measurement.
Software algorithm description of differential protection wiring discrimination:
setting: the main transformer high-low side transformation ratio and the CT transformation ratio are matched, the current direction is regulated to make the inflow neutral point positive and the outflow point negative, and the current direction of the low-voltage side is adjusted by 180 degrees for the convenience of vector diagram analysis.
Yi, Yy0
IA＝x∠0°，IB＝x∠240°,IB＝x∠120°。
Ia＝x∠0°，Ib＝x∠240°,Ic＝x∠120°。
Two, Yd1
IA＝x∠0°，IB＝x∠240°,IB＝x∠120°。
Ia＝1.732*x∠30°，Ib＝1.732*x∠270°,Ic＝1.732*x∠150°。
III, Yy6
IA＝x∠0°，IB＝x∠240°,IB＝x∠120°。
Ia＝x∠180°，Ib＝x∠60°,Ic＝x∠300°。
Tetra, Yd11
IA＝x∠0°，IB＝x∠240°,IB＝x∠120°。
Ia＝1.732*x∠330°，Ib＝1.732*x∠210°,Ic＝1.732*x∠90°。
Fifth, Dd0
IA＝1.732*x∠0°，IB＝1.732*x∠240°,IB＝1.732*x∠120°。
Ia＝1.732*x∠0°，Ib＝1.732*x∠240°,Ic＝1.732*x∠120°。
Sixthly and Dy1
IA＝1.732*x∠0°，IB＝1.732*x∠240°,IB＝1.732*x∠120°。
Ia＝x∠30°，Ib＝x∠270°,Ic＝x∠150°。
Seventhly, Dd6
IA＝1.732*x∠0°，IB＝1.732*x∠240°,IB＝1.732*x∠120°。
Ia＝1.732*x∠180°，Ib＝1.732*x∠60°,Ic＝1.732*x∠300°。
Eight and Dy11
IA＝1.732*x∠0°，IB＝1.732*x∠240°,IB＝1.732*x∠120°。
Ia＝x∠330°，Ib＝x∠210°,Ic＝x∠90°。
It should be noted that the detailed description of the invention is not included in the prior art, or can be directly obtained from the market, and the detailed connection mode can be widely applied in the field or daily life without creative efforts, and the detailed description is not repeated here.
Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A main transformer simulation on-load test system is characterized by comprising an outdoor unit system and two test terminals, wherein the outdoor unit system inputs AC 0-420V/10A power supply signals to terminals A, B, C and N of a high-voltage side of a transformer, one of the two test terminals tests the secondary current value of a high-voltage side CT of the transformer, and the other test terminal tests the secondary current value of a low-voltage side CT of the transformer.
2. The system of claim 1, wherein the outdoor unit system comprises:
the system comprises a microcontroller, a control terminal connected with the microcontroller and a first wireless module;
the electric voltage regulator is connected with an input power supply, and a voltage regulation control module of the electric voltage regulator is connected with the microcontroller;
the three-phase boosting current booster is connected with the electric voltage regulator, and the output end of the three-phase boosting current booster is connected with the high-voltage side of the transformer;
the voltage-current converter is secondarily connected with the microcontroller and the transformer high-voltage side mutual inductor;
each of the test terminals includes:
the display device comprises a second microcontroller, a display terminal connected with the second microcontroller and a second wireless module, wherein the second wireless module is communicated with the first wireless module;
the second voltage-current converter is secondarily connected with the second microcontroller and the transformer low-voltage side transformer;
and the input terminal is connected with the second microcontroller.
3. The main transformer simulation on-load test system of claim 2, wherein the control terminal is a seven-inch touch screen connected to the microcontroller via a UART1 serial port; the first wireless module is a 2.4G wireless communication module and is connected with the microcontroller through a UART2 serial port; the voltage regulating control module of the electric voltage regulator is connected with the microcontroller through a PWM interface; the voltage-current converter is connected with the microcontroller through an FSMC interface through a six-channel 16-bit synchronous sampling module of the voltage-current converter.
4. The main transformer simulation on-load test system of claim 2, wherein the display terminal is a 3.5-inch display screen, and is connected with the second microcontroller through a UART1 serial port; the second wireless module is a 2.4G wireless communication module and is connected with the second microcontroller through a UART2 serial port; the second voltage-current converter is connected with the microcontroller through an FSMC interface through a six-channel 16-bit synchronous sampling module; the input terminal is a 3 x 3 matrix keyboard and is connected with the second microcontroller through a GPIO interface.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203164343U (en) * | 2012-12-30 | 2013-08-28 | 余杭供电局 | Main transformer differential protection device on-load testing device |
| CN203798966U (en) * | 2014-02-25 | 2014-08-27 | 云南电网公司普洱供电局 | Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test |
| CN204649911U (en) * | 2015-06-12 | 2015-09-16 | 车立志 | A kind of withstand voltage test system for electrical equipment |
| CN109406907A (en) * | 2018-12-09 | 2019-03-01 | 国网辽宁省电力有限公司锦州供电公司 | High-impedance transformer simulates on-load through-flow test device and test method |
| CN111413640A (en) * | 2020-04-03 | 2020-07-14 | 国网甘肃省电力公司建设分公司 | Differential protection wiring detection method and device of high-impedance transformer |
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2020
- 2020-09-28 CN CN202011043417.8A patent/CN114280392A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203164343U (en) * | 2012-12-30 | 2013-08-28 | 余杭供电局 | Main transformer differential protection device on-load testing device |
| CN203798966U (en) * | 2014-02-25 | 2014-08-27 | 云南电网公司普洱供电局 | Impact voltage-withstanding test system used for high-voltage electrical equipment insulation test |
| CN204649911U (en) * | 2015-06-12 | 2015-09-16 | 车立志 | A kind of withstand voltage test system for electrical equipment |
| CN109406907A (en) * | 2018-12-09 | 2019-03-01 | 国网辽宁省电力有限公司锦州供电公司 | High-impedance transformer simulates on-load through-flow test device and test method |
| CN111413640A (en) * | 2020-04-03 | 2020-07-14 | 国网甘肃省电力公司建设分公司 | Differential protection wiring detection method and device of high-impedance transformer |
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