CN111596246A - Same-frequency same-phase calibration device and calibration method thereof - Google Patents
Same-frequency same-phase calibration device and calibration method thereof Download PDFInfo
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- CN111596246A CN111596246A CN201910135121.XA CN201910135121A CN111596246A CN 111596246 A CN111596246 A CN 111596246A CN 201910135121 A CN201910135121 A CN 201910135121A CN 111596246 A CN111596246 A CN 111596246A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A same-frequency and same-phase calibration device and a calibration method thereof are disclosed, the same-frequency and same-phase calibration device comprises: a same-frequency and same-phase power supply (1) connected with a variable-frequency power supply controller (2), the same-frequency and same-phase power supply (1) outputs an output voltage which has the same frequency and the same phase as a reference voltage based on a voltage control signal from the variable-frequency power supply controller (2), one side of the signal generator is connected with a signal generator (6) to receive a reference voltage signal and a high-voltage capacitive voltage divider (5) to receive a test voltage signal, the other side of the signal generator is connected with a same-frequency and same-phase power supply (1) and the signal generator (6), the device simulates a GIS bus PT secondary signal to generate a reference voltage signal to be input into a variable frequency power supply controller (2), a checking unit (7), the device comprises a first frequency sensor (8) for measuring the frequency of a reference voltage, a second frequency sensor (9) for measuring the frequency of a 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.
Description
Technical Field
The invention relates to the technical field of GIS (gas insulated switchgear) power, in particular to a same-frequency same-phase calibration device and a calibration method thereof.
Background
Gas insulated metal enclosed switchgear (GIS for short) has the advantages of small floor area, small influence from external environmental conditions, high reliability and the like, and is widely used in urban power grids in China. Particularly, with the acceleration of economic development and urbanization process in China, the demand of GIS equipment is increased rapidly. After the GIS equipment is expanded or overhauled, the manufacturing and assembling quality needs to be checked through a field alternating current withstand voltage test, and the good insulating property of the GIS equipment is ensured.
At present, GIS in early operation in China enters the middle and later periods of the service life, and according to the bathtub curve of the life cycle of equipment, the GIS equipment enters the fault multi-occurrence period, so that the power failure maintenance requirements of the GIS are greatly increased; in addition, the load of the transformer substation is continuously increased along with the development of economy, so that the requirement of the extension of the transformer substation is met. According to GIS equipment maintenance and handover acceptance standards, the GIS after maintenance/extension needs to be subjected to an alternating current withstand voltage test. The conventional GIS alternating-current voltage resistance adopts a resonance voltage-withstanding mode, and power failure in operation transformer stations is required to be matched, which creates huge contradiction with the requirement of the current society on the increasing power supply reliability of a power grid. Some power supply bureaus are forced to select a 24-hour electrified no-load mode to inspect the repaired/expanded GIS, which is undoubtedly difficult to find out potential insulation defects of the equipment, and leaves possible accident potential for the subsequent operation of the GIS equipment.
When the existing GIS series resonance voltage withstand test technology is adopted to carry out alternating current voltage withstand on an extension or maintenance interval, if the tested interval is isolated from the running equipment only by a bus isolating switch fracture, if peak values of test voltage and running voltage are reversely superposed, the insulation withstand capability of the bus isolating switch fracture is possibly exceeded, the fracture breakdown is caused, even a bus short circuit grounding fault is possibly caused, and the running system safety is endangered. To prevent this, the prior art requires: the adjacent operating equipment must be powered off and reliably grounded, and the double-bus GIS substation must be powered off in a total station, so that the power supply reliability of a power grid is greatly influenced, and the defects of difficulty in power supply transfer, high power grid operating risk and the like also exist.
In order to solve the problems, a common-frequency and same-phase alternating-current voltage withstand test technology is developed. The technology adopts adjacent operating equipment voltage (such as the secondary side voltage of an operating bus voltage transformer) as reference voltage, generates test voltage in a series resonance mode, and dynamically tracks the frequency and the phase of the test voltage in real time by utilizing a phase-locked loop technology, so that the frequency and the phase of the test voltage and the operating voltage are in the same frequency and phase state. At the moment, the voltage born by the fracture of the isolating switch between the operation part and the tested interval is the difference between the absolute values of the operation voltage and the test voltage, and is far smaller than the power frequency breakdown voltage of the fracture of the isolating switch, so that the fracture of the isolating switch cannot be broken down, and the GIS equipment in a charged operation state cannot be adversely affected. Therefore, the same-frequency and same-phase alternating-current voltage withstand test technology can complete the voltage withstand test of the extension or overhaul equipment under the condition that the bus and the adjacent GIS interval 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, so that the risk of 'mismatching' of a test system can be directly caused, the fracture of the bus isolating switch at the test interval can be discharged and broken down, and the impact on an operating power grid can be caused.
Regarding the periodic verification of the same-frequency and same-phase voltage-withstanding test control device, the device is in the state of no verification standard, no verification device and no verification mechanism at present, and no personnel and mechanisms at home and abroad develop the verification research of the same-frequency and same-phase voltage-withstanding test control device. In view of this, development of the checking aspect of the same-frequency and same-phase withstand voltage test control device is urgently needed.
The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the same-frequency same-phase calibration device and the calibration method thereof, which can accurately calibrate the same-frequency same-phase voltage-withstanding test control device and are far away from the GIS operation side, thereby improving the application universality and safety and not generating interference on the GIS operation side.
The purpose of the invention is realized by the following technical scheme.
In one aspect of the present invention, a same-frequency and same-phase calibration apparatus includes:
a same-frequency and same-phase power supply connected with the variable-frequency power supply controller, the same-frequency and same-phase power supply outputting an output voltage with the same frequency and phase as the reference voltage based on a voltage control signal from the variable-frequency power supply controller,
a boosting 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 boosting exciting transformer boosts the output voltage,
one end of the adjustable reactor is connected with the boosting exciting transformer, the other end of the adjustable reactor is connected with the high-voltage capacitive voltage divider,
a high-voltage capacitive voltage divider with one end 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 the high-voltage capacitive voltage divider to receive the test voltage signal, and the other side of which is connected with the same-frequency and same-phase power supply, the variable frequency power supply controller compares the reference voltage signal with the test voltage signal and sends a voltage control signal to the same-frequency and same-phase power supply,
a signal generator for simulating secondary signals of a GIS bus PT to generate reference voltage signals to be input into the variable frequency power supply controller,
the calibration 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 of 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 frequency of the reference voltage exceeds a preset frequency threshold value, the calibration unit gives out an alarm.
In the same-frequency and same-phase checking device, the signal generator comprises,
the main control chip is used for generating voltage data simulating the phase-to-ground voltage of three phases of the GIS bus, the voltage data comprises voltage amplitude and voltage frequency,
a signal source connected to the main control chip and generating a voltage signal based on the voltage data,
and the power amplification unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
In the same-frequency same-phase calibration 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 calibration 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 in-phase calibration device, the first frequency sensor and/or the second frequency sensor comprise a digital multimeter.
In the same-frequency in-phase calibration 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 either 100V.
In the same-frequency and same-phase calibration device, the frequency and amplitude adjustment steps of the signal generator are adjustable.
In the same-frequency and same-phase calibration device, the signal generator is provided with a frequency sweeping unit for changing frequency and/or a disturbing unit for changing amplitude, and 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.
In the same-frequency and same-phase calibration device, the same-frequency and same-phase power supply comprises a phase-locked loop module which is used for generating output voltage with the same frequency and phase as the reference voltage.
According to another aspect of the present invention, a calibration method using the same-frequency in-phase calibration apparatus includes the steps of,
the first step, the signal generator simulates secondary signals of a GIS bus PT to generate reference voltage signals to be input into the variable frequency power supply controller,
the second step, the frequency conversion power supply controller compares the reference voltage signal and the test voltage signal and sends a voltage control signal to a same-frequency and same-phase power supply, the same-frequency and same-phase power supply outputs an output voltage which has the same frequency and the same phase with the reference voltage based on the voltage control signal, the high-voltage capacitive voltage divider outputs the test voltage and samples the test voltage to form a test voltage signal to be input to the frequency conversion power supply controller,
and thirdly, measuring the frequency of the reference voltage by the first frequency sensor, measuring the frequency of the test voltage by the second frequency sensor, measuring the test voltage and the reference voltage by the phase difference measuring instrument with phase deviation in real time, and sending out an alarm by the verification unit when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation of the frequency of the test voltage and the frequency of the reference voltage exceeds a preset frequency threshold value.
The invention has the following beneficial effects:
the invention can accurately check the co-frequency and co-phase of the co-frequency and co-phase voltage-withstand test control device in real time, is far away from the GIS operation side, improves the application universality and safety, does not generate interference on the GIS operation side, and can check the co-frequency and co-phase alternating current voltage-withstand of the GIS in various working environments, particularly, for example, in an indoor environment far away from the GIS.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly apparent, and to make the implementation of the content of the description possible for those skilled in the art, and to make the above and other objects, features and advantages of the present invention more obvious, the following description is given by way of example of the specific embodiments 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 obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. Also, like parts are designated by like reference numerals throughout the drawings.
In the drawings:
FIG. 1 is a schematic structural diagram of a same-frequency and same-phase calibration apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a signal generator of an on-frequency in-phase calibration apparatus according to an embodiment of the present invention;
fig. 3 is a schematic step diagram of a sampling conversion method of an on-frequency in-phase calibration apparatus according to an embodiment of the present invention.
The invention is further explained below with reference to the figures 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 construed as 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. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the 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 which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
For the purpose of facilitating understanding of the embodiments of the present invention, the following description will be made by taking specific embodiments as examples with reference to the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present invention.
For better understanding, fig. 1 is a schematic structural diagram of an intra-frequency and in-phase calibration apparatus according to an embodiment of the present invention, and as shown in fig. 1, an intra-frequency and in-phase calibration apparatus 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 with the same frequency and the same phase as a reference voltage based on a voltage control signal from the variable-frequency power supply controller 2,
a boosting 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 boosting exciting transformer 3 boosts the output voltage,
an adjustable reactor 4, one end of which is connected with the boosting exciting transformer 3, the other end is connected with a high-voltage capacitive voltage divider 5,
a high-voltage capacitive voltage divider 5, wherein one end of the high-voltage capacitive voltage divider 5 is grounded, outputs a test voltage and samples the test voltage to form a test voltage signal to be input into 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 capacitive voltage divider 5 to receive the test voltage signal, and the other side is connected with a same-frequency and same-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 same-phase power supply 1,
a signal generator 6 for simulating a secondary signal of a GIS bus PT to generate a reference voltage signal to be input into the variable frequency power controller 2,
the verification unit 7 comprises 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, and the verification unit 7 gives an alarm when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation of the test voltage frequency and the frequency of the reference voltage exceeds a preset frequency threshold value.
Fig. 2 is a schematic structural diagram of a signal generator of an on-frequency in-phase calibration apparatus according to an embodiment of the present invention, the signal generator 6 includes,
the main control chip is used for generating voltage data simulating the phase-to-ground voltage of three phases of the GIS bus, the voltage data comprises voltage amplitude and voltage frequency,
a signal source connected to the main control chip and generating a voltage signal based on the voltage data,
and the power amplification unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
In the preferred embodiment of the same-frequency and same-phase calibration apparatus of the present invention, the signal generator 6 comprises a storage unit for storing voltage data and a touch screen for input and display.
In the preferred embodiment of the same-frequency and same-phase calibration device, the power amplification unit comprises a power amplification circuit and a booster transformer, and the power amplification circuit comprises a precise multi-turn potentiometer for gain adjustment.
For a further understanding of the signal generator 6,
in one embodiment, the frequency and amplitude of the PT secondary signal are completely determined by the grid. Generally, the frequency fluctuates back and forth within a small range of 50 ± 0.5Hz, and the amplitude also fluctuates. Reference to national standards
GB/T15945 and 1995 electric energy quality electric power system allows frequency deviation, the nominal frequency of the electric power system in China is 50Hz, and the normal frequency deviation allowable value of the electric power system is +/-0.2 Hz. The bias value may be relaxed to 0.5Hz when the system capacity is small.
In one embodiment, the nominal frequency is 50Hz, the frequency can be adjusted, and the frequency range is 45-60 Hz.
In one embodiment, the resolution of the frequency adjustment is at least 0.01Hz, the step pitch of the frequency adjustment is adjustable, for example, the variation of the frequency of each adjustment can be 0.01Hz, 0.1Hz, 0.5Hz, and the frequency adjustment can be flexibly set in the option menu of the instrument.
In one embodiment, the output has a fixed frequency pattern, and once regulation is stopped, the output frequency is fixed.
In one embodiment, the output has a frequency sweep mode, and at a set frequency point, within a certain range, the frequency changes from small to large and then from large to small. The method is closer to the actual situation and can simulate the frequency fluctuation of the power grid.
In one embodiment, the output voltage is a sine wave, the amplitude can be adjusted, and 100V can be output at maximum.
In one embodiment, the output voltage amplitude step pitch is adjustable, for example, the voltage variation amount can be set to 0.1V, also can be set to 1V, also can be set to 5V each time, and can be flexibly set in the 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 the voltage amplitude changes continuously from small to large and then from large to small at a set voltage point within a certain range. The method is closer to reality and can simulate the voltage fluctuation of the power 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 main control chip is a brain of the whole signal generator, executes a control program, reads voltage measurement data, outputs a control signal of a 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 to generate a small signal with adjustable frequency and amplitude, typically about 5V.
In one embodiment, the power amplifier uses a classic national semiconductor sound system chip LM3886, which is BTL-based, to amplify a small signal of about 5V to 40V. Since the bus PT secondary signal is usually
Or 100V, so the voltage amplitude needs to be boosted to 100V at maximum through a booster transformer. When the output voltage is required to fluctuate in a certain range, the control system needs to know the amplitude of the output voltage at the moment, so that real-time measurement is needed for control.
In a preferred embodiment of the same-frequency in-phase calibration apparatus of 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 in-phase calibration device, 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 either 100V.
In the preferred embodiment of the same-frequency and same-phase calibration 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 calibration apparatus of the present invention, the signal generator 6 is provided with a frequency sweep unit for varying frequency and/or a disturbance unit for varying amplitude, and within a certain frequency and/or amplitude range, the frequency and/or amplitude is from small to large and then from large to small.
In the preferred embodiment of the same-frequency and same-phase calibration apparatus of the present invention, the same-frequency and same-phase power supply 1 includes a phase-locked loop module for generating an output voltage having the same frequency and phase as the reference voltage.
In one embodiment, the signal generator 6 simulates a bus PT secondary signal at the substation site. The sleeve of the GIS can be understood as 1 thousand picofarads of capacitance to the ground, and the adjustable reactor and the capacitive voltage divider resonate at 50Hz by adjusting the adjustable reactor.
By using the high-precision digital multimeter, the measurement accuracy of the device on the output voltage of the same-frequency and same-phase power supply, the output voltage of the high-voltage capacitive voltage divider 5 and the PT secondary voltage can be detected. The signal frequency of the signal generator, the frequency of the signal of the high-voltage capacitive voltage divider 5 and the output frequency of the same-frequency and same-phase power supply can also be measured.
By using the digital oscilloscope, the waveforms of the output voltage of the voltage divider and the PT secondary voltage can be observed, and the phase deviation among the 2 signals can be visually and qualitatively checked.
And a high-precision phase difference measuring instrument is used for measuring the phase deviation of the output signal of the voltage divider and the PT secondary signal in real time, and comparing the phase deviation with the phase deviation displayed by the same-frequency same-phase control box to verify the measuring accuracy.
Fig. 3 is a schematic diagram showing steps of a sampling conversion method of an intra-frequency in-phase parity check device according to an embodiment of the present invention, a check method using the intra-frequency in-phase parity check device includes the following steps,
in a first step S1, the signal generator 6 simulates a GIS bus PT secondary signal to generate a reference voltage signal to be input to the variable frequency power controller 2,
a second step S2, the variable frequency power supply controller 2 compares the reference voltage signal with the test voltage signal and sends a voltage control signal to the same frequency and same phase power supply 1, the same frequency and same phase power supply 1 outputs an output voltage with the same frequency and same phase as the reference voltage based on the voltage control signal, the high voltage capacitive voltage divider 5 outputs the test voltage and samples it to form a test voltage signal to be input to the variable frequency power supply controller 2,
in a third step S3, the first frequency sensor 8 measures the frequency of the reference voltage, the second frequency sensor 9 measures the frequency of the test voltage, and the phase difference measuring device 10 measures the frequency of the test voltage and the reference voltage in real time, and the verification unit 7 sends an alarm when the phase deviation exceeds a predetermined phase threshold and/or the frequency deviation of the frequency of the test voltage and the frequency of the reference voltage 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 method and the device can accurately check the same-phase same-frequency data and are 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 embodiments and application fields, and the above-described embodiments are illustrative, instructive, and not restrictive. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. A same-frequency and same-phase calibration device is characterized in that the same-frequency and same-phase calibration device comprises:
a same-frequency and same-phase power supply (1) which is connected with a variable-frequency power supply controller (2), wherein the same-frequency and same-phase power supply (1) outputs an output voltage with the same frequency and the same phase as a reference voltage based on a voltage control signal from the variable-frequency power supply controller (2),
a boosting 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 boosting exciting transformer (3) boosts the output voltage,
an adjustable reactor (4), one end of which is connected with the boosting exciting transformer (3) and the other end is connected with a high-voltage capacitive voltage divider (5),
a high-voltage capacitive voltage divider (5), wherein one end of the high-voltage capacitive voltage divider (5) is grounded and outputs a test voltage which is sampled to form a test voltage signal to be input into 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 is connected with a high-voltage capacitive voltage divider (5) to receive the test voltage signal, the other side of which is connected with a same-frequency and same-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 same-phase power supply (1),
a signal generator (6) for simulating a secondary signal of a GIS bus PT to generate a reference voltage signal to be input into the variable frequency power supply controller (2),
the verification unit (7) comprises 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, and the verification unit (7) gives an alarm when the phase deviation exceeds a preset phase threshold value and/or the frequency deviation of the test voltage frequency and the frequency of the reference voltage exceeds a preset frequency threshold value.
2. The same-frequency in-phase calibration apparatus according to claim 1, wherein: preferably, the signal generator (6) comprises,
the main control chip is used for generating voltage data simulating the phase-to-ground voltage of three phases of the GIS bus, the voltage data comprises voltage amplitude and voltage frequency,
a signal source connected to the main control chip and generating a voltage signal based on the voltage data,
and the power amplification unit is connected with the signal source and amplifies the voltage signal to form a reference voltage signal.
3. The same-frequency in-phase calibration apparatus according to claim 1, wherein: the signal generator (6) includes a storage unit storing voltage data and a touch screen for input and display.
4. The same-frequency in-phase calibration apparatus according to claim 2, wherein:
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.
5. The same-frequency in-phase calibration apparatus 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 in-phase calibration apparatus 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
Or 100V.
7. The same-frequency in-phase calibration apparatus according to claim 1, wherein: the frequency and amplitude adjustment steps of the signal generator (6) are adjustable.
8. The same-frequency in-phase calibration apparatus according to claim 1, wherein: the signal generator (6) is provided with a sweep unit for varying the frequency and/or a perturbation unit for varying the amplitude, the frequency and/or amplitude being from small to large and then from large to small within a certain frequency and/or amplitude range.
9. The same-frequency in-phase calibration apparatus according to claim 1, wherein: the co-frequency and co-phase power supply (1) comprises a phase-locked loop module for generating an output voltage with the same frequency and phase as a reference voltage.
10. A verification method using the same-frequency same-phase verification apparatus as in any one of claims 1 to 9, comprising the steps of,
in the first step (S1), the signal generator (6) simulates a GIS bus PT secondary signal to generate a reference voltage signal to be input into the variable frequency power supply controller (2),
a second step (S2), the frequency conversion power supply controller (2) compares the reference voltage signal and the test voltage signal and sends a voltage control signal to the same-frequency same-phase power supply (1), the same-frequency same-phase power supply (1) outputs an output voltage which has the same frequency and the same phase as the reference voltage based on the voltage control signal, the high-voltage capacitive voltage divider (5) outputs the test voltage and samples the test voltage to form a test voltage signal to be input to the frequency conversion power supply controller (2),
in a third step (S3), the first frequency sensor (8) measures the frequency of the reference voltage, the second frequency sensor (9) measures the frequency of the test voltage, and the phase difference meter (10) measures the frequency of the test voltage and the reference voltage in real time, and the verification unit (7) issues an alarm when the phase deviation exceeds a predetermined phase threshold and/or the frequency deviation of the frequency of the test voltage from the frequency of the reference voltage exceeds a predetermined frequency threshold.
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