CN116699459A - Method and system for detecting grounding state of intelligent end screen grounding device of high-voltage sleeve - Google Patents
Method and system for detecting grounding state of intelligent end screen grounding device of high-voltage sleeve Download PDFInfo
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Abstract
The invention discloses a method and a system for detecting the grounding state of an intelligent end screen grounding device of a high-voltage sleeve, wherein the method comprises the following steps: when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state, measuring the amplitude of a current interference signal output by a current sensor in an intelligent end screen grounding device of the high-voltage sleeve; applying a voltage excitation signal to the current-carrying conductor, and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device; calculating the amplitude of a current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal; and determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude. The detection method is simple and feasible, has accurate and reliable detection results, and can be used as a judgment basis for the connection of the grounding states of the intelligent end screen grounding devices of the transformer substation.
Description
Technical Field
The invention relates to the technical field of high-voltage sleeve on-line monitoring, in particular to a method and a system for detecting the grounding state of an intelligent end screen grounding device of a high-voltage sleeve.
Background
The high-voltage sleeve is used as a core component of a transformer, a reactor and the like, is a necessary passage for sending out electric energy, has reliability related to the operation safety of the whole power system, and has serious safety accidents of explosion caused by the damage of the sleeve body and the heavy transformer and the like when the faults occur slightly. For the purpose of early warning of the fault of the bushing, a large number of online monitoring devices for the insulation state of the bushing are installed on the current high-voltage bushing. In order to obtain the insulating information of the sleeve, the monitoring device must install an intelligent end screen device on the sleeve to replace the original end screen end cover, and the main effect is that: on one hand, the high-voltage bushing end screen lead wire and the bushing flange form stable electric connection, and the electric connection state is the grounding state of the bushing end screen; on the other hand, the inside of the sleeve is provided with a low-frequency current sensor and a high-frequency current sensor, so that leakage current signals of the sleeve end screen can be accurately measured.
The ground connection of the bushing end screen is a sleeved 'life line', which is critical to the operation of the bushing, and the ground connection state of the bushing intelligent end screen must be detected after the installation of the bushing intelligent end screen is completed, but the ground connection state of the end screen leading-out terminal is positioned in the bushing intelligent end screen, so that the ground connection state of the bushing intelligent end screen cannot be judged in a visual mode. In addition, because the field sleeve flanges of the transformer substation are all in the grounding state, the electric excitation signals applied to the current carrying conductors or other positions can directly flow into the ground at the end screen, and the current signals cannot be acquired, and therefore the grounding state of the field sleeve flanges of the transformer substation is also judged in an electric signal measurement mode. So far, the grounding state of the end screen of the high-voltage bushing in the transformer substation field belongs to the black box problem, and no effective method is available for detecting the grounding state of the end screen of the bushing.
Therefore, a method for detecting the grounding state of the intelligent end screen grounding device of the high-voltage bushing, which can be applied to the transformer substation site, is needed.
Disclosure of Invention
The invention provides a method and a system for detecting the grounding state of an intelligent end screen grounding device of a high-voltage sleeve, which are used for solving the problem of how to efficiently determine.
In order to solve the above problems, according to an aspect of the present invention, there is provided a method for detecting a grounding state of an intelligent end screen grounding device of a high voltage bushing, the method comprising:
when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state, measuring the amplitude of a current interference signal output by a current sensor in an intelligent end screen grounding device of the high-voltage sleeve;
applying a voltage excitation signal to the current-carrying conductor, and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device;
calculating the amplitude of a current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal;
and determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude.
Preferably, the calculating the current theoretical signal amplitude of the intelligent end screen grounding device under the state of applying the voltage excitation signal includes:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
Preferably, wherein the method further comprises:
determining the amplitude and frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
Preferably, the determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude includes:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
Preferably, wherein the method calculates the maximum amplitude deviation using the following method, comprising:
ΔI 1max ＝|I 1max -I gr -I 0 |，
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |，
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |，
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
Preferably, the first decision rule includes:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively maximum frequenciesDeviation and minimum frequency deviation.
According to another aspect of the present invention, there is provided a system for detecting a ground state of an intelligent end shield grounding device of a high voltage bushing, the system comprising:
the interference signal determining unit is used for measuring the amplitude value of the current interference signal output by the current sensor in the intelligent end screen grounding device of the high-voltage sleeve when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state;
the measuring signal determining unit is used for applying a voltage excitation signal to the current-carrying conductor and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device;
the theoretical signal calculation unit is used for calculating the amplitude value of the current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal;
and the grounding state determining unit is used for determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude.
Preferably, the theoretical signal calculating unit calculates a current theoretical signal amplitude of the intelligent end screen grounding device in a state of applying the voltage excitation signal, including:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
Preferably, wherein the system further comprises:
the voltage excitation signal determining unit is used for determining the amplitude and the frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
Preferably, the ground state determining unit determines the ground state of the intelligent end-screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude, and includes:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
Preferably, wherein the ground state determining unit calculates the maximum amplitude deviation using the following manner, comprising:
ΔI 1max ＝|I 1max -I gr -I 0 |，
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |，
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
Preferably, the first decision rule includes:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Maximum frequency deviation and minimum frequency deviation, respectively.
Based on another aspect of the present invention, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements any one of the steps of a method for detecting a grounding state of a high voltage bushing intelligent end screen grounding device.
Based on another aspect of the present invention, the present invention provides an electronic device, including:
the computer readable storage medium as described above; and
one or more processors configured to execute the programs in the computer-readable storage medium.
The invention provides a method and a system for detecting the grounding state of an intelligent end screen grounding device of a high-voltage sleeve, wherein the method comprises the following steps: when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state, measuring the amplitude of a current interference signal output by a current sensor in an intelligent end screen grounding device of the high-voltage sleeve; applying a voltage excitation signal to the current-carrying conductor, and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device; calculating the amplitude of a current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal; and determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude. According to the invention, the voltage excitation signal is applied to the high-voltage sleeve, the output signal of the current sensor in the intelligent end screen grounding device is measured, the deviation between the measured value and the theoretical value is analyzed, the grounding state of the intelligent end screen grounding device is determined based on the deviation between the measured value and the theoretical value, the detection method is simple and easy to implement, the detection result is accurate and reliable, and the detection method can be used as a judgment basis for the grounding state handover of the intelligent end screen grounding device in a transformer substation site.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
fig. 1 is a flowchart of a method 100 for detecting a grounding state of an intelligent end-screen grounding device of a high-voltage bushing according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection system 200 for a grounding state of an intelligent end-screen grounding device of a high-voltage bushing according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
So far, the grounding state of the end screen of the high-voltage bushing in the transformer substation field belongs to the black box problem, and no effective method is available for detecting the grounding state of the end screen of the bushing. Aiming at the problems, the invention provides a detection method of the grounding state of the intelligent end screen grounding device of the high-voltage sleeve, which is simple and feasible, has accurate and reliable detection result and can be used as a judgment basis for the handover of the grounding state of the end screen on site.
Fig. 1 is a flowchart of a method 100 for detecting a grounding state of an intelligent end-screen grounding device of a high-voltage bushing according to an embodiment of the present invention. As shown in fig. 1, according to the method for detecting the grounding state of the intelligent end screen grounding device of the high-voltage bushing provided by the embodiment of the invention, through applying a voltage excitation signal to the high-voltage bushing, the output signal of the current sensor in the intelligent end screen grounding device is measured, the deviation between the measured value and the theoretical value is analyzed, the grounding state of the intelligent end screen grounding device is determined based on the deviation between the measured value and the theoretical value, the detection method is simple and easy, the detection result is accurate and reliable, and the method can be used as a judgment basis for the grounding state handover of the intelligent end screen grounding device of a transformer substation site. The method 100 for detecting the grounding state of the intelligent end screen grounding device of the high-voltage sleeve provided by the embodiment of the invention starts from step 101, and in step 101, when a current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state, the amplitude of a current interference signal output by a current sensor in the intelligent end screen grounding device of the high-voltage sleeve is measured.
In the invention, when measuring the amplitude of a current interference signal, the current-carrying conductor of the high-voltage sleeve is disconnected with the ground, and the current sensor in the intelligent end screen grounding device is in a normal working state at the moment, and the amplitude I of the output signal of the current sensor can be measured by using an oscilloscope gr 。
In step 102, a voltage excitation signal is applied to the current-carrying conductor, and the amplitude and the measurement frequency of a current measurement signal output by the intelligent end screen grounding device are measured.
Preferably, wherein the method further comprises:
determining the amplitude and frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
And step 103, calculating the theoretical current signal amplitude outputted by the intelligent end screen grounding device under the state of applying the voltage excitation signal.
Preferably, the calculating the current theoretical signal amplitude of the intelligent end screen grounding device under the state of applying the voltage excitation signal includes:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
In the present invention, when the current carrying conductor of the high voltage bushing is disconnected from the ground, a voltage excitation signal is applied to the current carrying conductor. The amplitude of the voltage excitation signal is required to be greater than or equal to 5 times of the amplitude of the interference signal, namely the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal is greater than or equal to a preset ratio threshold value 5; the frequency is required to be between 15Hz and 4000Hz, and the working linearity of the low-frequency current sensor is ensured. When the time voltage excitation signal is generated, the current sensor in the process of grounding the intelligent end screen is in a normal working state, the oscilloscope is used for continuously measuring the amplitude and the frequency of the output signal of the intelligent end screen while the voltage is applied, the duration is longer than 10 seconds, and the minimum value I of the amplitude of the current measurement signal is recorded 1min And maximum value I 1max Minimum value f of measurement frequency 1min And maximum value f 1max 。
In addition, in the invention, the capacitance value of the sleeve is measured to be C by a test instrument 0 Then according to I 0 ＝2πf 0 U 0 C 0 Calculating current theoretical signal amplitude I of intelligent end screen grounding device 0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein f 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
In step 104, a ground state of the intelligent end screen grounding device is determined based on the current disturbance signal amplitude, the current measurement signal amplitude, the measurement frequency, and the current theoretical signal amplitude.
Preferably, the determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude includes:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
Preferably, wherein the method calculates the maximum amplitude deviation using the following method, comprising:
ΔI 1max ＝|I 1max -I gr -I 0 |，
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |，
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
Preferably, the first decision rule includes:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Maximum frequency deviation and minimum frequency deviation, respectively.
In the present invention, the minimum amplitude deviation delta can be calculated by the following formulas, respectivelyI 1min Maximum amplitude deviation DeltaI 1max Minimum frequency deviation Δf 1min And maximum frequency deviation Δf 1max Comprising:
ΔI 1min ＝|I 1min +I gr -I 0 |，
ΔI 1max ＝|I 1max -I gr -I 0 |，
Δf 1min ＝|f 1min -f 0 |，
Δf 1max ＝f 1max -f 0 |，
and determining the grounding state of the intelligent end screen grounding device based on the amplitude deviation and the frequency deviation. When the amplitude of the current interference signal is less than or equal to a preset current amplitude threshold value, if the amplitude deviation delta I 1min 、△I 1max The first decision rule is satisfied: ΔI 1min ≤I 0 X 1% +0.1 and ΔI 1max ≤I 0 X 1% +0.1, and frequency deviation Δf 1min 、△f 1max The second determination rule is satisfied: Δf 1min Less than or equal to 0.2, and delta f 1max The grounding state of the intelligent end screen grounding device of the high-voltage sleeve is considered to be good if the grounding state is less than or equal to 0.2; otherwise, the grounding state of the intelligent end screen grounding device of the high-voltage sleeve is considered to be bad. When the field interference is large, the frequency measurement is seriously affected, namely the amplitude of the current interference signal is larger than the preset current amplitude threshold value, the frequency deviation can not be used as a judging condition of the intelligent end screen grounding state of the high-voltage sleeve, namely when the amplitude deviation delta I 1min And DeltaI 1max The first decision rule is satisfied: ΔI 1min ≤I 0 X 1% +0.1 and ΔI 1max ≤I 0 When the ratio is 1% +0.1, the grounding state of the intelligent end screen grounding device of the high-voltage sleeve can be considered to be good; otherwise, the grounding state of the intelligent end screen grounding device of the high-voltage sleeve is considered to be bad. Wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Frequency of the voltage excitation signal; the amplitude deviation is mA, and the frequency deviation is Hz; the preset current amplitude threshold can be set according to actual requirements.
The following specifically exemplifies embodiments of the present invention
In an embodiment of the present invention, the detecting step of the grounding state of the high-voltage bushing intelligent end screen grounding device includes:
(1) Measuring field interference signals
The sleeve current-carrying conductor is disconnected with the ground, a current sensor in the intelligent end screen grounding device is in a normal working state, and an oscilloscope is used for measuring the amplitude I of an output signal of the current sensor gr Is 0.08mA.
(2) Measuring current sensor output signal under voltage excitation conditions
The sleeve current-carrying conductor is in a disconnected state with the ground, a voltage excitation signal is applied to the current-carrying conductor by using a different-frequency dielectric loss tester, and the amplitude U is set 0 At a frequency f of 10kV 0 For 30s at 49Hz and 51Hz, respectively. The current sensor in the intelligent end screen grounding device is in a normal working state, the oscilloscope is used for continuously measuring the amplitude and the frequency of an output signal of the intelligent end screen grounding device when the voltage is applied, and the following steps are recorded:
amplitude minimum I at a frequency of 49Hz 1min Is 2.31mA, maximum amplitude I 1max Is 2.51mA, frequency minimum f 1min At 48.7Hz, frequency maximum f 1max 49.2Hz.
Amplitude minimum I at a frequency of 51Hz 1min Is 2.40mA, maximum amplitude I 1max Is 2.56mA, frequency minimum f 1min At 50.8Hz, frequency maximum f 1max 51.1Hz.
(3) Measuring the capacitance of the sleeve and calculating the theoretical value of the current amplitude
1000kV sleeve of main transformer of certain extra-high voltage transformer station, and applying electricity by using different-frequency dielectric loss tester (model AI-6000D)Amplitude U of piezoelectric excitation signal 0 Frequency f of voltage excitation signal of 10kV 0 The sleeve capacitance value is 779pF which is measured at 49Hz and 51Hz, and the theoretical amplitude of the end screen current is obtained through formula calculation:
at 49Hz, I 0 ＝2πf 0 U 0 C 0 ＝2.40mA，
At 51Hz, I 0 ＝2πf 0 U 0 C 0 ＝2.50mA。
(4) Respectively calculating amplitude deviation delta I 1min 、△I 1max And frequency deviation Deltaf 1min 、△f 1max . At a frequency of 49Hz, the parameters were calculated as follows:
ΔI 1min ＝|I 1min +I gr -I 0 |＝0.01mA，
ΔI 1max ＝|I 1max -I gr -I 0 |＝0.03mA，
Δf 1min ＝|f 1min -f 1 |＝0.3Hz，
Δf 1max ＝f 1max -f 1 |＝0.2Hz，
at a frequency of 51Hz, the parameters were calculated as follows:
ΔI 1min ＝|I 1min +I gr -I 0 |＝0.02mA，
ΔI 1max ＝|I 1max -I gr -I 0 |＝0.02mA，
Δf 1min ＝|f 1min -f 1 |＝0.2Hz，
Δf 1max ＝f 1max -f 1 |＝0.1Hz，
(5) High-voltage bushing intelligent end screen grounding device grounding state judgment method
As can be seen from comparison, the amplitude deviation DeltaI is observed at the frequencies of 49Hz and 51Hz 1min 、△I 1max All satisfy the first determination rule and the frequency deviation Deltaf 1min 、△f 1max The second decision rule is satisfied,
therefore, the high-voltage bushing intelligent end screen grounding device can be judged to have good grounding state.
Fig. 2 is a schematic structural diagram of a detection system 200 for a grounding state of an intelligent end-screen grounding device of a high-voltage bushing according to an embodiment of the present invention. As shown in fig. 2, a system 200 for detecting a grounding state of an intelligent end screen grounding device of a high-voltage bushing according to an embodiment of the present invention includes: an interference signal determination unit 201, a measurement signal determination unit 202, a theoretical signal calculation unit 203, and a ground state determination unit 204.
Preferably, the disturbing signal determining unit 201 is configured to measure the amplitude of the current disturbing signal output by the current sensor in the intelligent end screen grounding device of the high voltage bushing when the current carrying conductor of the high voltage bushing and the ground are in an off state.
Preferably, the measurement signal determining unit 202 is configured to apply a voltage excitation signal to the current-carrying conductor, and measure the amplitude and the measurement frequency of the current measurement signal output by the intelligent end-screen grounding device.
Preferably, wherein the system further comprises:
the voltage excitation signal determining unit is used for determining the amplitude and the frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
Preferably, the theoretical signal calculating unit 203 is configured to calculate a current theoretical signal amplitude outputted by the intelligent end-screen grounding device in a state where the voltage excitation signal is applied.
Preferably, the theoretical signal calculating unit 203 calculates a current theoretical signal amplitude of the intelligent end-screen grounding device in a state of applying the voltage excitation signal, including:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is of high pressureThe capacitance of the sleeve.
Preferably, the grounding state determining unit 204 is configured to determine the grounding state of the intelligent end-screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude.
Preferably, the ground state determining unit 204 determines the ground state of the intelligent end-screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude, and includes:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
Preferably, the ground state determining unit 204 calculates the maximum amplitude deviation by using the following method, including:
ΔI 1max ＝|I 1max -I gr -I 0 |
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |，
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |，
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
Preferably, the first decision rule includes:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Maximum frequency deviation and minimum frequency deviation, respectively.
The system 200 for detecting the grounding state of the intelligent end-shield grounding device of the high-voltage bushing according to the embodiment of the present invention corresponds to the method 100 for detecting the grounding state of the intelligent end-shield grounding device of the high-voltage bushing according to another embodiment of the present invention, and is not described herein.
Based on another aspect of the present invention, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements any one of the steps of a method for detecting a grounding state of a high voltage bushing intelligent end screen grounding device.
Based on another aspect of the present invention, the present invention provides an electronic device, including:
the computer readable storage medium as described above; and
one or more processors configured to execute the programs in the computer-readable storage medium.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (14)
1. The method for detecting the grounding state of the intelligent end screen grounding device of the high-voltage sleeve is characterized by comprising the following steps:
when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state, measuring the amplitude of a current interference signal output by a current sensor in an intelligent end screen grounding device of the high-voltage sleeve;
applying a voltage excitation signal to the current-carrying conductor, and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device;
calculating the amplitude of a current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal;
and determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude.
2. The method of claim 1, wherein said calculating a current theoretical signal magnitude of said intelligent end screen grounding device in a state where said voltage excitation signal is applied comprises:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
3. The method according to claim 1, wherein the method further comprises:
determining the amplitude and frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
4. The method of claim 1, wherein the determining the ground state of the intelligent end screen grounding device based on the current disturbance signal amplitude, current measurement signal amplitude, measurement frequency, and current theoretical signal amplitude comprises:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
5. The method of claim 4, wherein the method calculates the maximum amplitude deviation using the following method, comprising:
ΔI 1max ＝|I 1max -I gr -I 0 |，
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |，
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |，
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
6. The method of claim 4, wherein the first decision rule comprises:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Maximum frequency deviation and minimum frequency deviation, respectively.
7. A system for detecting a ground state of an intelligent end screen grounding device of a high-voltage bushing, the system comprising:
the interference signal determining unit is used for measuring the amplitude value of the current interference signal output by the current sensor in the intelligent end screen grounding device of the high-voltage sleeve when the current carrying conductor of the high-voltage sleeve and the ground are in a disconnected state;
the measuring signal determining unit is used for applying a voltage excitation signal to the current-carrying conductor and measuring the amplitude value and the measuring frequency of a current measuring signal output by the intelligent end screen grounding device;
the theoretical signal calculation unit is used for calculating the amplitude value of the current theoretical signal output by the intelligent end screen grounding device under the state of applying the voltage excitation signal;
and the grounding state determining unit is used for determining the grounding state of the intelligent end screen grounding device based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude.
8. The system according to claim 7, wherein the theoretical signal calculating unit calculates a current theoretical signal amplitude of the intelligent end-screen grounding device in a state where the voltage excitation signal is applied, comprising:
I 0 ＝2πf 0 U 0 C 0 ，
wherein I is 0 Is the current theoretical signal amplitude; f (f) 0 Frequency of the voltage excitation signal; u (U) 0 Amplitude of the voltage excitation signal; c (C) 0 Is the capacitance of the high voltage bushing.
9. The system of claim 7, wherein the system further comprises:
the voltage excitation signal determining unit is used for determining the amplitude and the frequency of the voltage excitation signal; the amplitude of the voltage excitation signal can enable the ratio of the amplitude of the current measurement signal output by the intelligent end screen grounding device to the amplitude of the current interference signal to be greater than or equal to a preset ratio threshold; the frequency range of the voltage excitation signal is as follows: 15 Hz-4000 Hz.
10. The system according to claim 7, wherein the ground state determining unit determines the ground state of the intelligent end-screen grounding device based on the current interference signal amplitude, current measurement signal amplitude, measurement frequency, and current theoretical signal amplitude, comprising:
calculating a maximum amplitude deviation, a minimum amplitude deviation, a maximum frequency deviation and a minimum frequency deviation based on the current interference signal amplitude, the current measurement signal amplitude, the measurement frequency and the current theoretical signal amplitude;
when the amplitude of the current interference signal is smaller than or equal to a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judgment rule at the same time, and the maximum frequency deviation and the minimum frequency deviation meet a second judgment rule; if the intelligent terminal screen grounding device meets the requirements, determining that the grounding state of the intelligent terminal screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state;
when the amplitude of the current interference signal is larger than a preset current amplitude threshold, judging whether the maximum amplitude deviation and the minimum amplitude deviation meet a first judging rule or not; if the intelligent end screen grounding device meets the requirement, determining that the grounding state of the intelligent end screen grounding device is a good state; otherwise, determining that the grounding state of the intelligent end screen grounding device is a bad state.
11. The system according to claim 10, wherein the ground state determination unit calculates the maximum amplitude deviation by:
ΔI 1max ＝|I 1max -I gr -I 0 |，
calculating the minimum amplitude deviation using the following manner, including:
ΔI 1min ＝|I 1min +I gr -I 0 |，
the maximum frequency deviation is calculated using the following method, including:
Δf 1max ＝|f 1max -f 0 |，
calculating the minimum frequency deviation using the following manner, including:
Δf 1min ＝|f 1min -f 0 |，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Respectively a maximum frequency deviation and a minimum frequency deviation; i gr Is the amplitude of the current interference signal; i 0 Is the current theoretical signal amplitude; i 1max And I 1min The maximum value and the minimum value of the amplitude of the current measurement signal are respectively; f (f) 1max And f 1min Respectively measuring the maximum value and the minimum value of the frequency; f (f) 0 Is the frequency of the voltage excitation signal.
12. The system of claim 10, wherein the first decision rule comprises:
ΔI 1min ≤I 0 ×1％+0.1，
ΔI 1max ≤I 0 ×1％+0.1，
the second decision rule includes:
△f 1min ≤0.2，
△f 1max ≤0.2，
wherein DeltaI 1max And DeltaI 1min Respectively a maximum amplitude deviation and a minimum amplitude deviation; Δf 1max And Deltaf 1min Maximum frequency deviation and minimum frequency deviation, respectively.
13. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-6.
14. An electronic device, comprising:
the computer readable storage medium recited in claim 13; and
one or more processors configured to execute the programs in the computer-readable storage medium.
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| CN117368621B (en) * | 2023-12-06 | 2024-02-23 | 南方电网科学研究院有限责任公司 | Casing state monitoring method and device, storage medium and computer equipment |
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