CN111596246B - Same-frequency and same-phase verification device and verification method thereof - Google Patents
Same-frequency and same-phase verification device and verification method thereof Download PDFInfo
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- CN111596246B CN111596246B CN201910135121.XA CN201910135121A CN111596246B CN 111596246 B CN111596246 B CN 111596246B CN 201910135121 A CN201910135121 A CN 201910135121A CN 111596246 B CN111596246 B CN 111596246B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The utility model discloses a same-frequency same-phase checking device and a checking method thereof, wherein the same-frequency same-phase checking device comprises: the same-frequency in-phase power supply (1) is connected with the variable-frequency power supply controller (2), the same-frequency in-phase power supply (1) outputs output voltage which is in the same frequency and in phase with reference voltage based on a voltage control signal from the variable-frequency power supply controller (2), the variable-frequency power supply controller (2) is connected with the signal generator (6) on one side to receive the reference voltage signal and the high-voltage capacitive divider (5) to receive the test voltage signal, the same-frequency in-phase power supply (1) is connected with the other side, the signal generator (6) simulates a GIS bus PT secondary signal to generate the reference voltage signal to be input into the variable-frequency power supply controller (2), and the verification unit (7) comprises a first frequency sensor (8) for measuring the reference voltage frequency, a second frequency sensor (9) for measuring the test voltage frequency and a phase difference measuring instrument (10) for measuring the phase deviation of the test voltage and the reference voltage in real time.
Description
Technical Field
The invention relates to the technical field of GIS power, in particular to a same-frequency and same-phase verification device and a verification method thereof.
Background
The gas-insulated metal-enclosed switchgear (gas insulated switchgear, GIS for short) has the advantages of small occupied area, small influence by external environment conditions, high reliability and the like, and is widely used in urban power grids in China. Especially, with the acceleration of economic development and urban process in China, the demand of GIS equipment is increased sharply. After the GIS equipment is expanded or overhauled, the manufacturing and assembly quality is checked by an on-site alternating current withstand voltage test, so that the insulation performance of the GIS equipment is ensured to be good.
At present, the early-stage operation GIS of China already enters the middle and later stages of the service life, and according to the bathtub curve of the equipment life cycle, the batch of GIS equipment already enters the fault multiple-stage, so that the power failure maintenance requirement of the GIS is greatly increased; in addition, the load of the transformer substation is continuously increased along with the development of economy, so that the requirement of extension of the transformer substation is caused. According to the GIS equipment maintenance and handover acceptance standard, the GIS after maintenance/extension needs to be subjected to an alternating current withstand voltage test. The conventional GIS alternating current withstand voltage adopts a resonant pressurizing mode, and needs to be matched with power failure of a transformer substation, which generates great contradiction with the current requirement of the whole society on increasingly higher power supply reliability of a power grid. Part of power supply offices are forced to choose to adopt a 24-hour live-empty mode to inspect the overhauled/expanded GIS, which clearly makes it difficult to find potential insulation defects of equipment, and potential accident potential is left for the subsequent operation of GIS equipment.
When the existing GIS series resonance withstand voltage test technology is adopted to carry out alternating current withstand voltage on an extension or maintenance interval, if the tested interval is isolated from operation equipment only by a bus isolating switch fracture, if the peak value of test voltage and operation voltage are reversely overlapped, the test voltage and the operation voltage are very likely to exceed the insulation tolerance capacity of the bus isolating switch fracture, the fracture breaks down, even a bus short circuit grounding fault is likely to occur, and the safety of an operation system is endangered. To prevent this, the prior art test requires: adjacent operation equipment must have a power failure and be reliably grounded, and a double-bus GIS transformer substation must have a power failure in a whole station, so that the power supply reliability of a power grid is greatly influenced, and the defects of difficult power conversion and high power grid operation risk and the like are overcome.
In order to solve the problems, the same-frequency and same-phase alternating-current withstand voltage test technology is developed. The technique adopts the voltage of adjacent operation equipment (such as the secondary side voltage of an operation bus voltage transformer) as the reference voltage, generates test voltage in a series resonance mode, and utilizes the phase-locked loop technique to dynamically track the frequency and the phase of the test voltage in real time so that the frequency and the phase of the test voltage and the operation voltage are in the same-frequency and same-phase state. At this time, the voltage born by the disconnecting switch fracture of the operating part and the tested compartment is the difference between the absolute value of the operating voltage and the test voltage, which is far smaller than the power frequency breakdown voltage of the disconnecting switch fracture, so that the disconnecting switch fracture is not broken down, and the GIS equipment in the electrified operating state is not adversely affected. Therefore, the same-frequency and same-phase alternating current withstand voltage test technology can finish the withstand voltage test on extension or overhaul equipment under the condition that the bus and the adjacent GIS are not powered off.
The comparison and judgment functions of the same-frequency and same-phase control device are deviated or even wrong due to long-term use or external reasons, the risk of 'losing the same state' of a test system can be directly caused, the fracture of the test interval bus isolating switch is likely to discharge and break down, and the impact on an operating power grid can be possibly caused.
Regarding the regular check of the same-frequency same-phase withstand voltage test control device, no check standard, no check device and no check mechanism exist at present, and no personnel or mechanism at home and abroad develop check research of the same-frequency same-phase withstand voltage test control device. In view of this, development of the same-frequency and same-phase withstand voltage test control device for verification is urgently needed.
The above information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known in the country to a person of ordinary skill in the art.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the same-frequency and same-phase verification device and the verification method thereof, which can accurately verify the same-frequency and same-phase withstand voltage test control device and are far away from the GIS operation side, thereby improving the application universality and the safety and avoiding the interference to the GIS operation side.
The aim of the invention is achieved by the following technical scheme.
In one aspect of the present invention, a common-frequency and common-phase checking device includes:
the same-frequency and same-phase power supply is connected with the variable-frequency power supply controller, and outputs output voltage which is same in frequency and phase with the reference voltage based on a voltage control signal from the variable-frequency power supply controller,
a step-up exciting transformer, the low-voltage side of which is connected with the same-frequency and same-phase power supply, one end of the high-voltage side is grounded, the other end is connected with an adjustable reactor, the step-up exciting transformer steps up the output voltage,
one end of the adjustable reactor is connected with the step-up exciting transformer, the other end is connected with the high-voltage divider,
a high-voltage capacitive voltage divider, one end of which is grounded, outputs a test voltage and samples the test voltage to form a test voltage signal to be input to the variable frequency power supply controller,
a variable frequency power supply controller, one side of which is connected with the signal generator to receive the reference voltage signal and connected with the high voltage divider to receive the test voltage signal, the other side of which is connected with the same frequency and phase power supply, the variable frequency power supply controller compares the reference voltage signal and the test voltage signal and sends a voltage control signal to the same frequency and phase power supply,
a signal generator which simulates the secondary signal of the GIS bus PT to generate a reference voltage signal to be input into the variable-frequency power supply controller,
the verification unit comprises a first frequency sensor for measuring the frequency of the reference voltage, a second frequency sensor for measuring the frequency of the test voltage and a phase difference measuring instrument for measuring the phase deviation between the test voltage and the reference voltage in real time, and the verification unit gives out a warning when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation between the frequency of the test voltage and the frequency of the reference voltage exceeds the preset frequency threshold value.
In the same-frequency and same-phase checking device, the signal generator comprises,
a main control chip for generating voltage data of the ground phase voltage of the three phases of the analog GIS bus, wherein the voltage data comprises voltage amplitude and voltage frequency,
the signal source is connected with the main control chip and generates a voltage signal based on the voltage data,
and the power amplifying unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
In the same-frequency and same-phase verification device, the signal generator comprises a storage unit for storing voltage data and a touch screen for inputting and displaying.
In the same-frequency and same-phase verification device, the power amplification unit comprises a power amplification circuit and a step-up transformer, and the power amplification circuit comprises a precise multi-turn potentiometer for gain adjustment.
In the same-frequency and same-phase verification device, the first frequency sensor and/or the second frequency sensor comprises a digital multimeter.
In the same-frequency and same-phase verification device, the frequency of a reference voltage signal generated by a signal generator is 49.5-50.5Hz, and the amplitude of the reference voltage signal is
V is alternatively 100V.
In the same-frequency and same-phase verification device, the frequency and amplitude adjustment steps of the signal generator are adjustable.
In the same-frequency and same-phase verification device, the signal generator is provided with a sweep frequency unit for changing the frequency and/or a disturbance unit for changing the amplitude, and the frequency and/or the amplitude are/is from small to large and then from large to small within a certain frequency and/or amplitude range.
In the same-frequency and same-phase verification device, the same-frequency and same-phase power supply comprises a phase-locked loop module for generating an output voltage which is same in frequency and phase with a reference voltage.
According to another aspect of the present invention, a verification method using the same-frequency and same-phase verification device includes the steps of,
the first step, the signal generator simulates the secondary signal of GIS bus PT to generate reference voltage signal to be input into the variable frequency power supply controller,
a second step of comparing the reference voltage signal and the test voltage signal by the variable frequency power supply controller and transmitting a voltage control signal to the same-frequency and same-phase power supply, outputting an output voltage which is the same frequency and same phase as the reference voltage based on the voltage control signal by the same-frequency and same-phase power supply, outputting the test voltage by the high-voltage capacitive voltage divider and sampling the test voltage to form the test voltage signal to be input to the variable frequency power supply controller,
and a third step, wherein the first frequency sensor measures the reference voltage frequency, the second frequency sensor measures the test voltage frequency, and the phase difference measuring instrument of the phase deviation measures the test voltage and the reference voltage in real time, and when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation of the test voltage frequency and the reference voltage frequency exceeds the preset frequency threshold value, the verification unit gives a warning.
The invention has the following beneficial effects:
the invention can accurately and real-timely verify the same frequency and the same phase of the same-frequency same-phase voltage withstand test control device, is far away from the GIS operation side, improves the application universality and the safety, does not interfere the GIS operation side, and can verify the same-frequency same-phase alternating current withstand voltage of the GIS in various working environments, particularly in the environment such as the indoor environment far away from the GIS.
The foregoing description is only an overview of the technical solutions of the present invention, to the extent that it can be implemented according to the content of the specification by those skilled in the art, and to make the above-mentioned and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the present invention.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic diagram of a common-frequency and common-phase checking device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal generator of a common-frequency and common-phase verification device according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating steps of a sampling conversion method of the same-frequency and same-phase verification device according to an embodiment of the present invention.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to fig. 1 to 3. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the present invention, reference will now be made to the drawings, by way of example, and specific examples of which are illustrated in the accompanying drawings.
For better understanding, fig. 1 is a schematic structural diagram of an on-channel and on-phase checking device according to an embodiment of the present invention, as shown in fig. 1, an on-channel and on-phase checking device includes:
a same-frequency and same-phase power supply 1 connected to the variable frequency power supply controller 2, the same-frequency and same-phase power supply 1 outputting an output voltage of the same frequency and same phase as the reference voltage based on a voltage control signal from the variable frequency power supply controller 2,
a step-up exciting transformer 3, the low-voltage side of which is connected with the same-frequency and same-phase power supply 1, one end of the high-voltage side is grounded, the other end is connected with an adjustable reactor 4, the step-up exciting transformer 3 steps up the output voltage,
an adjustable reactor 4, one end of which is connected with the step-up exciting transformer 3, the other end is connected with a voltage divider 5,
the high-voltage capacitive voltage divider 5, the high-voltage capacitive voltage divider 5 with one end grounded outputs a test voltage and samples it to form a test voltage signal to be input to the variable frequency power supply controller 2,
a variable frequency power supply controller 2, one side of which is connected with a signal generator 6 to receive a reference voltage signal and a high voltage divider 5 to receive the test voltage signal, the other side is connected with the same frequency in-phase power supply 1, the variable frequency power supply controller 2 compares the reference voltage signal and the test voltage signal and sends a voltage control signal to the same frequency in-phase power supply 1,
a signal generator 6 which simulates the GIS bus PT secondary signal to generate a reference voltage signal to be input into the variable frequency power supply controller 2,
a verification unit 7 comprising a first frequency sensor 8 for measuring the frequency of the reference voltage, a second frequency sensor 9 for measuring the frequency of the test voltage and a phase difference measuring instrument 10 for measuring the phase deviation of the test voltage from the reference voltage in real time, the verification unit 7 giving an alarm when the phase deviation exceeds a predetermined phase threshold and/or the frequency deviation of the test voltage frequency from the reference voltage frequency exceeds a predetermined frequency threshold.
Fig. 2 is a schematic diagram of the structure of a signal generator of the same-frequency and same-phase checking device according to an embodiment of the present invention, the signal generator 6 includes,
a main control chip for generating voltage data of the ground phase voltage of the three phases of the analog GIS bus, wherein the voltage data comprises voltage amplitude and voltage frequency,
the signal source is connected with the main control chip and generates a voltage signal based on the voltage data,
and the power amplifying unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
In a preferred embodiment of the same frequency and phase checking device according to the present invention, the signal generator 6 includes a memory unit for storing voltage data and a touch screen for inputting and displaying.
In the preferred embodiment of the same-frequency and same-phase verification device, the power amplification unit comprises a power amplification circuit and a step-up transformer, and the power amplification circuit comprises a precise multi-turn potentiometer for gain adjustment.
In order to further understand the signal generator 6,
in one embodiment, the frequency and amplitude of the PT secondary signal are determined entirely by the grid. Typically, the frequency fluctuates back and forth over a small range of 50.+ -. 0.5Hz, as does the amplitude. Reference to national standard
GB/T15945-1995 electric energy quality power system allows frequency deviation, the nominal frequency of the power system in China is 50Hz, and the normal frequency deviation allowable value of the power system is +/-0.2 Hz. When the system capacity is small, the offset value may be relaxed to 0.5Hz.
In one embodiment, the nominal frequency is 50Hz, the frequency is adjustable, and the frequency range is 45-60Hz.
In one embodiment, the resolution of the frequency adjustment is at least 0.01Hz, the step size of the frequency adjustment is adjustable, for example, the variation of each time the frequency is adjusted can be 0.01Hz, can be set to 0.1Hz, can be set to 0.5Hz, and can be flexibly set in an option menu of the instrument.
In one embodiment, a fixed frequency pattern is output, and once the adjustment is stopped, the output frequency is fixed.
In one embodiment, a sweep pattern is output, and the frequency is changed continuously from small to large and then from large to small within a certain range at a set frequency point. The method is close to the actual situation, and frequency fluctuation of the power grid can be simulated.
In one embodiment, the output voltage is sinusoidal, and the amplitude is adjustable, and a maximum of 100V can be output.
In one embodiment, the output voltage amplitude step is adjustable, for example, the variation of each time of voltage adjustment can be 0.1V, 1V, 5V, and the output voltage step can be flexibly set in an option menu of the instrument.
In one embodiment, the output voltage has a fixed voltage pattern, and once regulation is stopped, the output voltage amplitude is fixed.
In one embodiment, the output voltage has a perturbation mode, and at a set voltage point, the voltage amplitude is continuously changed from small to large and then from large to small within a certain range. This approach is closer to reality and can simulate voltage fluctuations of the grid.
In one embodiment, the memory is used to hold calibration data for voltage measurements and menu data for option settings.
In one embodiment, the touch screen is used for setting menu parameters, displaying output voltage and frequency, and executing man-machine operation.
In one embodiment, the master control chip is the brain of the entire signal generator, executes a control program, reads voltage measurement data, outputs a control signal of the signal source, and controls the frequency and amplitude of the output signal of the signal source.
In one embodiment, the signal source is controlled by the main control chip, and generates a small signal with adjustable frequency and amplitude, typically about 5V.
In one embodiment, the power amplifying section amplifies a small signal of about 5V to 40V using a classical U.S. national semiconductor company sound dedicated chip LM3886, connected to BTL. Due to the bus PT secondary signal being normally
Or at a voltage of 100V,the voltage amplitude is boosted up to a maximum of 100V by a step-up transformer. When the output voltage is required to fluctuate within a certain range, the control system needs to know the amplitude of the output voltage at the moment, so real-time measurement is required to facilitate control.
In a preferred embodiment of the same-frequency and same-phase checking device according to the present invention, the first frequency sensor 8 and/or the second frequency sensor 9 comprise a digital multimeter.
In the preferred embodiment of the same-frequency and same-phase verification device of the invention, the frequency of the reference voltage signal generated by the signal generator 6 is 49.5-50.5Hz, and the amplitude of the reference voltage signal is
V is alternatively 100V.
In the preferred embodiment of the same-frequency and same-phase verification device, the frequency and amplitude adjustment steps of the signal generator 6 are adjustable.
In a preferred embodiment of the same-frequency and same-phase verification device, the signal generator 6 is provided with a frequency sweep unit for changing the frequency and/or a disturbance unit for changing the amplitude, and the frequency and/or the amplitude are/is changed from small to large and then from large to small within a certain frequency and/or amplitude range.
In a preferred embodiment of the same-frequency and same-phase verification device of the present invention, the same-frequency and same-phase power supply 1 includes a phase-locked loop module for generating an output voltage that is in phase with a reference voltage.
In one embodiment, the signal generator 6 simulates a bus PT secondary signal of the substation site. The sleeve of the GIS can be understood as a capacitor of 1 kilo picofarad to the ground, and the adjustable reactor and the capacitive voltage divider are made to resonate at 50Hz by adjusting the adjustable reactor.
The measurement accuracy of the device with respect to the same-frequency and same-phase power supply output voltage, the high-voltage capacitive divider 5 output voltage and the PT secondary voltage can be detected by using the high-precision digital multimeter. The signal frequency of the signal generator, the frequency of the signal of the high voltage divider 5, the same frequency and same phase power output frequency can also be measured.
The digital oscilloscope can be used for watching the waveforms of the output voltage of the voltage divider and the PT secondary voltage, and visually and qualitatively checking the phase deviation between the 2 signals.
And using a high-precision phase difference measuring instrument to measure the phase deviation of the output signal of the voltage divider and the PT secondary signal in real time, comparing the phase deviation with the phase deviation displayed by the same-frequency and same-phase control box, and verifying the measuring accuracy.
Fig. 3 is a schematic diagram illustrating steps of a sampling conversion method of an in-phase and in-frequency verification device according to an embodiment of the present invention, a verification method using the in-phase and in-frequency verification device includes the steps of,
in the first step S1, the signal generator 6 simulates the secondary signal of the GIS bus PT to generate a reference voltage signal to be input into the variable frequency power supply controller 2,
a second step S2, the variable frequency power supply controller 2 compares the reference voltage signal and the test voltage signal and sends a voltage control signal to the same frequency and phase power supply 1, the same frequency and phase power supply 1 outputs an output voltage which is in phase with the reference voltage and same frequency based on the voltage control signal, the high voltage capacitive divider 5 outputs the test voltage and samples the test voltage signal to form the test voltage signal for input to the variable frequency power supply controller 2,
in a third step S3, the first frequency sensor 8 measures the reference voltage frequency, the second frequency sensor 9 measures the test voltage frequency, and the phase difference measuring instrument 10 of the phase deviation measures the test voltage and the reference voltage in real time, and the verification unit 7 issues a warning when the phase deviation exceeds a predetermined phase threshold and/or the frequency deviation of the test voltage frequency and the reference voltage frequency exceeds a predetermined frequency threshold.
In one embodiment, the verification unit 7 issues an adjustment signal to adjust the variable frequency power supply controller 2 when the phase deviation exceeds a predetermined phase threshold and/or the frequency deviation of the test voltage frequency from the reference voltage frequency exceeds a predetermined frequency threshold.
The invention can accurately verify the same-frequency data and is far away from the GIS operation side.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described specific embodiments and application fields, and the above-described specific embodiments are merely illustrative, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous forms of the invention without departing from the scope of the invention as claimed.
Claims (7)
1. The utility model provides a same frequency homophase verifying attachment which characterized in that, same frequency homophase verifying attachment includes:
a same-frequency and same-phase power supply (1) connected with the variable-frequency power supply controller (2), wherein the same-frequency and same-phase power supply (1) outputs an output voltage which is the same in frequency and phase as the reference voltage based on a voltage control signal from the variable-frequency power supply controller (2),
a step-up exciting transformer (3) with a low-voltage side connected with the same-frequency and same-phase power supply (1), one end of a high-voltage side grounded, and the other end connected with an adjustable reactor (4), the step-up exciting transformer (3) boosting the output voltage,
an adjustable reactor (4) with one end connected with the step-up exciting transformer (3) and the other end connected with a voltage divider (5),
a high-voltage capacitive voltage divider (5), one end of which is grounded, the high-voltage capacitive voltage divider (5) outputs test voltage and samples the test voltage to form a test voltage signal to be input to the variable-frequency power supply controller (2),
a variable frequency power supply controller (2), one side of which is connected with a signal generator (6) to receive a reference voltage signal and a high voltage divider (5) to receive the test voltage signal, the other side is connected with a same frequency and phase power supply (1), the variable frequency power supply controller (2) compares the reference voltage signal and the test voltage signal and sends a voltage control signal to the same frequency and phase power supply (1),
a signal generator (6) which simulates the secondary signal of the GIS bus PT to generate a reference voltage signal to be input into the variable frequency power supply controller (2),
a verification unit (7) comprising a first frequency sensor (8) for measuring the frequency of the reference voltage, a second frequency sensor (9) for measuring the frequency of the test voltage and a phase difference measuring instrument (10) for measuring the phase deviation of the test voltage and the reference voltage in real time, when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation of the test voltage frequency and the reference voltage frequency exceeds a preset frequency threshold value, the verification unit (7) gives a warning, the signal generator (6) is provided with a frequency sweep unit for changing the frequency and/or a disturbance unit for changing the amplitude, the frequency and/or the amplitude are from small to large and then from large to small in a certain frequency and/or amplitude range, the resolution of frequency adjustment is at least 0.01Hz, and the same-frequency same-phase power supply (1) comprises a phase-locked loop module for generating output voltages which are same in frequency and phase with the reference voltage, and the output voltages are sine waves;
the same-frequency and same-phase checking device is utilized to execute the following checking method, which comprises the following steps,
a first step (S1) of generating a reference voltage signal by simulating a GIS bus PT secondary signal by a signal generator (6) to input the reference voltage signal into a variable-frequency power supply controller (2),
a second step (S2) of the variable frequency power supply controller (2) comparing the reference voltage signal and the test voltage signal and transmitting a voltage control signal to the same frequency and phase power supply (1), the same frequency and phase power supply (1) outputting an output voltage which is the same frequency and phase as the reference voltage based on the voltage control signal, the high voltage capacitive voltage divider (5) outputting the test voltage and sampling it to form the test voltage signal for input to the variable frequency power supply controller (2),
a third step (S3) of measuring the reference voltage frequency by the first frequency sensor (8), measuring the test voltage frequency by the second frequency sensor (9), and measuring the test voltage and the reference voltage in real time by the phase difference measuring instrument (10) of the phase deviation, and when the phase deviation exceeds a preset phase threshold value, and/or the frequency deviation of the test voltage frequency and the reference voltage frequency exceeds the preset frequency threshold value, the checking unit (7) gives a warning;
when the phase deviation exceeds a predetermined phase threshold value and/or the frequency deviation of the test voltage frequency and the reference voltage frequency exceeds a predetermined frequency threshold value, the verification unit 7 also sends out an adjusting signal to adjust the variable frequency power supply controller (2);
therefore, the same-frequency same-phase voltage withstand test control device is accurately checked and is far away from the GIS operation side, and interference to the GIS operation side is avoided.
2. The same-frequency and same-phase checking device according to claim 1, wherein: the signal generator (6) comprises a signal generator,
a main control chip for generating voltage data of the ground phase voltage of the three phases of the analog GIS bus, wherein the voltage data comprises voltage amplitude and voltage frequency,
the signal source is connected with the main control chip and generates a voltage signal based on the voltage data,
and the power amplifying unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
3. The same-frequency and same-phase checking device according to claim 1, wherein: the signal generator (6) comprises a memory unit for storing voltage data and a touch screen for input and display.
4. The same-frequency and same-phase checking device according to claim 2, wherein:
the power amplifying unit comprises a power amplifying circuit and a step-up transformer, and the power amplifying circuit comprises a precise multi-turn potentiometer for gain adjustment.
5. The same-frequency and same-phase checking device according to claim 1, wherein: the first frequency sensor (8) and/or the second frequency sensor (9) comprise a digital multimeter.
6. The same-frequency and same-phase checking device according to claim 1, wherein: the frequency of the reference voltage signal generated by the signal generator (6) is 49.5-50.5Hz, and the amplitude of the reference voltage signal is 100V +.
V is alternatively 100V。
7. The same-frequency and same-phase checking device according to claim 1, wherein: the frequency and amplitude adjustment steps of the signal generator (6) are adjustable.
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