CN111983288A - Voltage test system and method for high-voltage power equipment - Google Patents
Voltage test system and method for high-voltage power equipment Download PDFInfo
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- CN111983288A CN111983288A CN202010824804.9A CN202010824804A CN111983288A CN 111983288 A CN111983288 A CN 111983288A CN 202010824804 A CN202010824804 A CN 202010824804A CN 111983288 A CN111983288 A CN 111983288A
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- voltage
- transient overvoltage
- power equipment
- measuring device
- sampling
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
Abstract
The invention discloses a voltage testing system and a method of high-voltage power equipment, wherein the testing system comprises a first capacitive voltage divider formed by a high-voltage bushing, sampling jointing clamps and a transient overvoltage measuring device, the transient overvoltage measuring device is connected with the high-voltage bushing through the two sampling jointing clamps, one ends of the two sampling jointing clamps are detachably fastened on an umbrella skirt outside the high-voltage bushing, the upper and lower positions of the two sampling jointing clamps are adjustable, and high-voltage signals are collected through the two sampling jointing clamps and transmitted to the transient overvoltage measuring device. The transient overvoltage test system can carry out a system transient voltage test without disassembling the wiring of primary equipment, thereby solving the problems that the existing transient overvoltage measurement device needs to be directly connected with the tested power equipment, the safety of the power equipment is threatened, and the wiring danger is large.
Description
Technical Field
The application relates to the technical field of high-voltage equipment, in particular to a voltage testing system and method of high-voltage power equipment.
Background
Before a newly-built high-voltage and extra-high-voltage transformer substation is put into operation, in order to check the insulation performance of the transformer substation and a circuit, switching-off, switching-on and switching-on operations of a power transmission line are required, impact switching-on operations of a transformer are required, switching-off and switching-on operations of low capacitance and low impedance are required, and the operation electromagnetic transient process of a system is simulated. In the test process, the overvoltage frequency and amplitude in the operation process of the system need to be measured so as to check the insulation condition of the equipment.
The existing voltage signal measurement system needs to be directly connected with power equipment, and comprises the following steps: one is to hang the capacitive divider directly in the high voltage system; one is to connect the secondary voltage divider to the end screen of the high voltage bushing; one is connected to the secondary terminal of the voltage transformer. Once the measuring equipment has problems, the safety of the tested electric equipment is threatened directly.
The suspended capacitive voltage divider in the high-voltage system has insulation hidden trouble (particularly, the extra-high voltage divider is difficult to manufacture), and can cause ground fault; the tail screen of the sleeve is connected with a signal, which may cause a tail screen open circuit or poor grounding connection to bring operation hidden trouble; the secondary signal acquisition can cause the conditions of short circuit of the voltage transformer, distortion of measured data and the like. The voltage signal measurement method has large influence on the safety of power equipment and high wiring danger, for example, a capacitive voltage divider needs to be carried and installed by a crane, the wiring of the end screen of a transformer bushing needs to be carried out by climbing, and the like, so that the risk potential is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the transient overvoltage measuring device solves the problems that the existing transient overvoltage measuring device is directly connected with the tested power equipment, the safety of the power equipment is threatened, and wiring danger is high.
The transient overvoltage measuring device acquires the voltage signal of the tested power equipment by connecting the high-voltage bushing, does not need to disassemble the wiring of primary equipment or acquire the signal at the end screen of the bushing, and acquires the transient overvoltage through the voltage divider formed by the umbrella skirt capacitor outside the high-voltage bushing, thereby avoiding the phenomenon that the safety of the power equipment is threatened due to the occurrence of problems of the measuring device.
The technical scheme adopted by the invention is as follows:
the invention provides a voltage testing system of high-voltage power equipment in a first aspect, which comprises a transient overvoltage measuring device, and a first capacitive voltage divider formed by two sampling jointing clamps and an umbrella skirt capacitor outside a high-voltage bushing of the tested power equipment;
the voltage measuring port of the transient overvoltage measuring device is connected to a high-voltage bushing of the tested power equipment through two sampling jointing clamps;
one ends of the two sampling jointing clamps are detachably fixed on a high-voltage bushing of the tested power equipment, and the positions of the two sampling jointing clamps on the high-voltage bushing are adjustable; the other ends of the two sampling jointing clamps are connected to a voltage measuring port of the transient overvoltage measuring device;
the voltage testing system obtains the transient overvoltage of the tested power equipment through the first capacitive voltage divider, transmits the obtained transient overvoltage data of the tested power equipment to the transient overvoltage measuring device through the two sampling jointing clamps, and performs secondary voltage division through the transient overvoltage measuring device to finish the measurement of the transient overvoltage.
The second aspect of the present invention provides a method for measuring transient overvoltage of high voltage power equipment, including:
and 4, periodically transmitting the stored voltage data to a background, so that a tester can conveniently analyze and process the data to obtain a test result.
The invention has the beneficial effects that: the high-voltage bushing capacitance-based voltage sampling device provided by the invention performs voltage sampling on the basis of the first capacitive voltage divider formed by the high-voltage bushing capacitance, and avoids the access of a high-voltage divider measuring device and a bushing end screen signal-taking mode.
The invention can realize the transient voltage test of the system without disassembling the wiring of the primary equipment, and can effectively carry out the transient overvoltage test in the system debugging.
And the test system is calibrated through the power supply signal generator, so that the reliability of the measured data is ensured.
The data saves the wiring work of a large number of secondary measurement leads through wireless transmission, and the tester is far away from the test site, thereby ensuring the safety of the measuring instrument and the personnel, improving the test efficiency and the safety, and having good practical application value and market prospect.
Drawings
The technical solution of the present application is further explained below with reference to the drawings and the embodiments.
FIG. 1 is a wiring diagram of a voltage testing system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an overvoltage transient measurement device according to an embodiment of the invention;
FIG. 3 is a top view of a voltage testing system of an embodiment of the present invention;
FIG. 4 is a schematic view of a sampling clamp for connection to a high voltage bushing in accordance with an embodiment of the present invention.
The reference numbers in the figures are:
1-transient overvoltage measuring means; 2-a first connecting member; 3-a second connector; 4-high-voltage bushing terminals; 5-an NFC antenna; 6-an insulating layer; 7-a second capacitive divider; 8-measuring device terminals; 9-sampling jointing clamp; 10-waveform recorder, 11-connecting wire.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Example 1
The embodiment provides a voltage testing system of a high-voltage power device, as shown in fig. 1 and fig. 3, which includes a transient overvoltage measuring device 1, and further includes two sampling jointing clamps 9 and a first capacitive voltage divider formed by an umbrella skirt capacitor outside a high-voltage bushing of a tested power device;
the voltage measuring port of the transient overvoltage measuring device 1 is connected to a high-voltage bushing of the tested electrical equipment through two sampling jointing clamps 9;
one end of each of the two sampling jointing clamps 9 is detachably fixed on a high-voltage bushing of the tested power equipment, and the positions of the two sampling jointing clamps 9 on the high-voltage bushing are adjustable; the other ends of the two sampling jointing clamps 9 are connected to a voltage measuring port of the transient overvoltage measuring device;
the voltage testing system obtains the transient overvoltage of the tested power equipment through a first capacitive voltage divider formed by an umbrella skirt capacitor outside the high-voltage bushing, transmits the obtained transient overvoltage data of the tested power equipment to the transient overvoltage measuring device through two sampling jointing clamps, and performs secondary voltage division through the transient overvoltage measuring device to finish the measurement of the transient overvoltage.
The embodiment selects the tested power equipment high-voltage bushing as the voltage sampling carrier, and the high-voltage bushing generally comprises a capacitor core body, a shed group and other components, wherein the shed group is sleeved on the capacitor core body, one ends of two sampling jointing clamps 9 of the high-voltage bushing are detachably fastened on the external shed of the high-voltage bushing, and the other ends of the two sampling jointing clamps are fixed on the transient overvoltage measuring device through a wiring terminal 8.
Wherein, the position of sample binding clip 9 on high-voltage bushing is adjustable, can confirm to measure the sample binding clip and lay the position according to the difference (1000kV, 500kV, 220kV, 110kV) of electric power system voltage, and the sample binding clip can be dismantled and change. As shown in fig. 4, which is a schematic structural diagram of a sampling jointing clamp, as can be seen from fig. 1, two sampling jointing clamps 9 are respectively connected to corresponding jointing terminals 8 of the transient overvoltage measurement device through corresponding jointing wires 11.
In this embodiment, the high voltage signal of the tested power device is taken from two ends of a sampling jointing clamp 9 connected with a high voltage bushing, and is transmitted to the transient overvoltage measuring device 1 through an external wiring terminal 8 of the transient overvoltage measuring device 1, and the transient overvoltage measuring device 1 performs secondary voltage division on the obtained voltage signal to complete the measurement of the transient overvoltage.
This embodiment installs measuring device on high-voltage bushing, neither need dismantle the wiring of primary equipment, also need not get the signal in sleeve pipe end screen department, acquires transient state overvoltage data through the first capacitive voltage divider that the outside full skirt electric capacity of high-voltage bushing formed to realize voltage acquisition through two sampling binding clips 9 of peripheral hardware, it is nimble convenient to measure.
Optionally, the transient overvoltage measuring device includes a second capacitive voltage divider 7, and the second capacitive voltage divider 7 is connected to the two sampling jointing clamps 9 through a voltage measuring port, and is configured to perform secondary voltage division on the obtained transient overvoltage signal, and measure the transient overvoltage of the measured power device.
The second capacitive voltage divider comprises a non-inductive capacitor, the non-inductive capacitor is uniformly distributed in the shielding box through annular arrangement, and an adjustable switch is arranged outside the second capacitive voltage divider and used for adjusting the size of the non-inductive capacitor, performing secondary voltage division and transmitting a voltage signal to the photoelectric isolation sensor.
The second capacitive voltage divider 7 of the embodiment is arranged inside the transient overvoltage measuring device 1, is annularly arranged by adopting a non-inductive capacitor, is uniformly arranged in a shielding box according to a coaxial arrangement principle, is externally provided with an adjustable switch, adjusts the size of the capacitor, and can perform secondary voltage division.
Optionally, the transient overvoltage measuring device is provided with a fully-enclosed stainless steel shell, an insulating layer is arranged inside the shell, and the stainless steel shell is connected with the high-voltage end of the high-voltage bushing.
The shell of the transient overvoltage measuring device is made of a fully-closed stainless steel material and is connected with the high-voltage end of the high-voltage sleeve, so that the potential is fixed, and meanwhile, the transient overvoltage measuring device plays a role in shielding; the inside insulating layer that adopts insulating material preparation of shell guarantees the safe and reliable operation of transient overvoltage measuring device.
As shown in fig. 1 and fig. 3, the high-voltage terminal of the high-voltage bushing of the transient overvoltage measurement device is provided with a high-voltage bushing terminal 4, and the transient overvoltage measurement device 1 is connected to the terminal 4 of the high-voltage terminal of the high-voltage bushing through the first connecting member 2 and the second connecting member 3.
Optionally, as shown in fig. 2, the transient overvoltage measurement device further includes a photoelectric isolation sensor, an AD conversion circuit, a control unit, a signal conditioning circuit, a memory, and a wireless transmission module, wherein a voltage-dividing signal output end of the second capacitive voltage divider is connected to the photoelectric isolation sensor, an output end of the photoelectric isolation sensor is connected to an analog input port of the AD conversion circuit, a digital output port of the AD conversion circuit is connected to a signal input end of the signal conditioning circuit, a signal output end of the signal conditioning circuit is connected to the memory, and the memory is connected to the wireless transmission module and used for transmitting the measured voltage signal to the waveform recorder in the background.
In this embodiment, the high voltage signal is taken from two ends of a sampling jointing clamp 9 connected with a high voltage measuring sleeve, and is transmitted to an internal second capacitive voltage divider 7 through an external wiring terminal 8 of the transient overvoltage measuring device 1, the voltage signal after secondary voltage division is subjected to photoelectric isolation, and under the control of a control unit, the analog-to-digital conversion and storage of the transient overvoltage signal are realized, and finally, the transient overvoltage is transmitted to a background waveform recorder through a wireless transmission module, so that the measurement of the transient overvoltage is completed.
Optionally, the voltage testing system further includes a power signal generator, and the voltage of the power signal generator is adjustable within a range of 0-1000V, and the frequency of the power signal generator is adjustable within a range of 0-50kHz, so as to achieve voltage calibration of the transient overvoltage measuring device at different frequencies.
The power supply signal generator of the embodiment is a standard voltage source, after the transient overvoltage measuring device is installed, the voltage of the transient overvoltage measuring device is calibrated by the standard voltage source, the voltage of the transient overvoltage measuring device can be adjusted within the range of 0-1000V, the frequency of the transient overvoltage measuring device can be adjusted within the range of 0-50kHz, and a calibration value is recorded and stored to serve as a basis for analyzing measured data.
The embodiment ensures the reliability of the measured data by carrying out voltage calibration.
Optionally, the control unit is a CPLD control chip.
In this embodiment, a CPLD (complex Programmable Logic device) chip is used as the control unit, which has the advantages of accurate sampling, high sampling rate, high resolution, real-time data transmission and processing, and the CPLD chip can improve the speed and accuracy of measurement.
In addition, the transient overvoltage measuring device of the embodiment adopts a lithium battery for power supply, and manages the lithium battery through a lithium battery chip.
Optionally, the wireless transmission module includes an NFC antenna, and the waveform recorder and the transient overvoltage measurement device are both provided with an NFC antenna.
The transient overvoltage measuring device and the waveform recorder are both provided with NFC antennas, and data transmission is achieved through a wireless communication mode of the NFC antennas.
The data saves a large amount of wiring work of secondary measurement leads through wireless transmission, saves a large amount of test wires, ensures the safety of measuring instruments and personnel by keeping testing personnel away from a test site, and improves the testing efficiency and the safety.
The specific measurement process of the measurement system of the embodiment is as follows:
(1) and (3) performing simulation calculation on the high-voltage bushing by adopting MATLAB to obtain a capacitance distribution curve of the high-voltage bushing, and further determining the installation positions of the two sampling jointing clamps 9 according to different voltages (1000kV, 500kV, 220kV and 110kV) of the power system.
(2) Adjusting a noninductive capacitor in the transient overvoltage measuring device through an adjusting switch according to the calculated voltage value of the high-voltage bushing (or the post insulator), so that the transient voltage value after secondary voltage division meets the storage requirement;
(3) the data acquisition module realizes data AD conversion, data acquisition and data storage through a CPLD controller and each module for processing data in the CPLD.
The second capacitive voltage divider 7 divides the acquired voltage signal for the second time and transmits the divided voltage signal to the photoelectric isolation sensor, the photoelectric isolation sensor uses an electro-optic crystal as a sensitive element and uses an optical fiber as an information transmission conductor to realize voltage measurement and conversion, and the AD conversion circuit converts an analog voltage signal obtained by measurement and conversion of the photoelectric isolation sensor into a digital signal and stores the digital signal in a memory.
(4) The wireless transmission module adopts the NFC technology, and transmits the data stored in the memory to the background waveform recorder for further data analysis in a wireless communication mode of the NFC antenna.
Example 2
The embodiment provides a voltage testing method of high-voltage power equipment, which comprises the following steps:
and 4, periodically transmitting the stored voltage data to a background, so that a tester can conveniently analyze and process the data to obtain a test result.
Optionally, the present embodiment further includes a step of calibrating voltage:
and a special power signal generator is adopted to calibrate the voltage of the transient overvoltage measuring device under different frequencies to serve as a reference basis of the actually measured voltage waveform.
The test method of this embodiment is implemented by the test system in embodiment 1, and please refer to embodiment 1 for the specific structure and principle of the test system.
The invention adopts the high-voltage bushing to install the measuring device, does not need to disassemble the wiring of primary equipment and fetch signals at the end screen of the bushing, acquires transient overvoltage data through a first capacitive voltage divider formed by an umbrella skirt capacitor outside the high-voltage bushing, then finishes signal isolation, acquisition conversion, storage and wireless transmission by the transient overvoltage measuring device, finishes data analysis and processing by a waveform recorder, and calibrates a measuring system through a power supply signal generator to ensure the accuracy of voltage signals.
The invention can realize that the transient voltage test of the system can be carried out without disassembling the wiring of primary equipment, and the data saves a large amount of wiring work of secondary measurement leads through wireless transmission, and the tester is far away from the test site to ensure the safety of a measuring instrument and personnel.
In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A voltage test system of high-voltage power equipment comprises a transient overvoltage measuring device and is characterized by further comprising two sampling jointing clamps and a first capacitive voltage divider formed by umbrella skirt capacitors outside a high-voltage bushing of the tested power equipment;
the voltage measuring port of the transient overvoltage measuring device is connected to a high-voltage bushing of the tested power equipment through two sampling jointing clamps;
one ends of the two sampling jointing clamps are detachably fixed on a high-voltage bushing of the tested power equipment, and the positions of the two sampling jointing clamps on the high-voltage bushing are adjustable; the other ends of the two sampling jointing clamps are connected to a voltage measuring port of the transient overvoltage measuring device;
the voltage testing system obtains the transient overvoltage of the tested power equipment through the first capacitive voltage divider, transmits the obtained transient overvoltage data of the tested power equipment to the transient overvoltage measuring device through the two sampling jointing clamps, and performs secondary voltage division through the transient overvoltage measuring device to finish the measurement of the transient overvoltage.
2. The system for voltage testing of high voltage power equipment according to claim 1, wherein the over voltage transient measurement device comprises a second capacitive voltage divider connected to the two sampling clamps through a voltage measurement port for secondary voltage division of the obtained over voltage transient signal.
3. The voltage testing system of high voltage power equipment according to claim 2, wherein the transient overvoltage measuring device further comprises a photo-isolation sensor, an AD conversion circuit, a control unit, a signal processing circuit, a memory, and a wireless transmission module, wherein the divided signal output terminal of the second capacitive voltage divider is connected to the photo-isolation sensor, the output terminal of the photo-isolation sensor is connected to the analog input port of the AD conversion circuit, the digital output port of the AD conversion circuit is connected to the signal input terminal of the signal processing circuit, the signal output terminal of the signal processing circuit is connected to the memory, and the memory is connected to the wireless transmission module for transmitting the measured voltage signal to the background waveform recorder.
4. The voltage testing system of claim 2, wherein the second capacitive voltage divider comprises non-inductive capacitors uniformly arranged in a shielding box by a ring arrangement, and an adjustable switch is arranged outside for adjusting the size of the non-inductive capacitors, performing secondary voltage division, and transmitting a voltage signal to the photoelectric isolation sensor.
5. The voltage testing system of high voltage electric power equipment according to claim 1, further comprising a power signal generator having a voltage in the range of 0-1000V and a frequency in the range of 0-50kHz for calibrating the voltage of the transient overvoltage measuring device at different frequencies.
6. The voltage test system of high voltage power equipment according to claim 3, wherein the control unit is a CPLD control chip.
7. The voltage testing system of high-voltage power equipment according to claim 3, wherein the wireless transmission module comprises an NFC antenna, and the waveform recorder and the transient overvoltage measurement device are both provided with NFC antennas.
8. The voltage testing system of high voltage power equipment according to claim 3, wherein the transient overvoltage measuring device is provided with a totally enclosed stainless steel casing, and an insulating layer is provided inside the casing, and the stainless steel casing is connected with the high voltage end of the high voltage bushing.
9. A transient overvoltage measurement method of high-voltage power equipment is characterized by comprising the following steps:
step 1, calculating the capacitance distribution of a high-voltage bushing of the tested electrical equipment;
step 2, fixing the transient overvoltage measuring device on a high-voltage bushing of the tested power equipment, connecting two sampling jointing clamps to different parts of the high-voltage bushing according to the capacitance distribution of the high-voltage bushing, and adjusting the internal capacitance of the transient overvoltage measuring device to enable the capacitance to be matched with the capacitance of the high-voltage bushing of the tested power equipment;
step 3, the transient overvoltage device collects and stores voltage signals of the tested power equipment in real time;
and 4, periodically transmitting the stored voltage data to a background, so that a tester can conveniently analyze and process the data to obtain a test result.
10. The method for measuring transient overvoltage of high voltage power equipment according to claim 9, further comprising the step of voltage calibration:
and a special power signal generator is adopted to calibrate the voltage of the transient overvoltage measuring device under different frequencies to serve as a reference basis of the actually measured voltage waveform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010824804.9A CN111983288A (en) | 2020-08-17 | 2020-08-17 | Voltage test system and method for high-voltage power equipment |
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| CN202010824804.9A CN111983288A (en) | 2020-08-17 | 2020-08-17 | Voltage test system and method for high-voltage power equipment |
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