Reverse suppression test method for current type on-line monitoring device

Abstract

The invention belongs to the technical field of field inspection of current type online monitoring devices, and relates to a reverse suppression inspection method of a current type online monitoring device, which comprises the following steps of: S1, detecting a background signal of real-time measurement data; s2, performing reverse transformation on the background signal obtained by detection to obtain a reverse signal, and suppressing or counteracting the reverse signal and the background signal; and S3, testing the calibrated grounding current sensor. According to the invention, reverse transformation is carried out on a detection signal (background signal) of real-time measurement data, a background reverse signal and the background signal are used for suppression or offset, a current type online monitoring measurement channel is created in a micro-background environment, field detection work of characteristic values in a small signal range is carried out, and the detection precision is improved. The method not only can guarantee the detection of the characteristic value of the current type online monitoring device in a small signal range, but also can improve the on-site rapid detection efficiency of the current type online monitoring device, and guarantees the on-site detection work of the current type online monitoring device to be scientific and efficient.

Description

Technical Field

[0001] The invention belongs to the technical field of on-site inspection of current online monitoring devices, and in particular relates to a reverse suppression inspection method for current online monitoring devices. Background Art

[0002] At present, the current online monitoring devices in the power system mainly include arrester leakage current online monitoring devices, transformer (high-voltage reactor) core / clamp grounding current online monitoring devices, transformer (high-voltage reactor) high-frequency partial discharge online monitoring devices, etc. The current online monitoring technology is effective in discovering defects such as foreign body discharge, poor conductor connection, internal component damage or poor insulation inside the combined electrical appliances, and plays an important role in the early warning of defects in operating power equipment. A large number of current online monitoring devices in operation are affected by the electromagnetic environment such as high electric field and high magnetic field of energized equipment during long-term operation. The performance of the electronic components inside the online monitoring may age or deteriorate, resulting in poor measurement accuracy, which in turn affects the accurate judgment of the operating status of the power equipment. After major hidden dangers occur, they are not discovered in time, and it is necessary to conduct regular on-site inspections of the online monitoring devices. However, the current online monitoring devices of the operating power equipment are always measuring. When the measurement background value exceeds the inspection characteristic value, it is impossible to carry out the inspection of the characteristic value in the small signal range, which is not conducive to the development of on-site inspections.

[0003] Therefore, it is necessary to design a reverse suppression inspection method for current online monitoring devices. By performing a reverse transformation on the detection signal (background signal) of the real-time measurement data and using the background reverse signal to suppress or offset the background signal, a micro-background environment of a current online monitoring measurement channel is created. On-site inspection of characteristic values ​​in the small signal range can be carried out, which can not only ensure the inspection of characteristic values ​​in the small signal range of current online monitoring devices, but also improve the efficiency of on-site rapid inspection of current online monitoring devices, thereby ensuring the scientific and efficient on-site inspection of current online monitoring devices. Summary of the invention

[0004] In view of this, the present invention provides a reverse suppression inspection method for a current online monitoring device.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A reverse suppression test method for a current online monitoring device comprises the following steps: S1. Detecting the background signal of real-time measurement data; S2, performing a reverse transformation on the detected background signal to obtain a reverse signal, suppressing or offsetting the reverse signal and the background signal, and ensuring that the suppressed background value meets the on-site inspection of the characteristic value current in the small signal range; S3. Carry out inspection of the ground current sensor being tested.

[0006] Furthermore, the inspection device used in the reverse suppression inspection method includes an inspection device host, a calibration ground current sensor, a first test line and a second test line. The first test line is used to output a reverse suppression current, and the second test line is used to output a characteristic value current in a small signal range after the reverse signal and the background signal are suppressed or offset.

[0007] Furthermore, the specific steps of step S1 include: connecting the calibration ground current sensor to the main unit of the inspection device, and carrying out detection of the detection signal of the real-time measurement data, wherein the detection signal of the real-time measurement data is the background signal of the real-time measurement data, and after obtaining the background signal, the main unit of the inspection device analyzes the waveform of the background signal.

[0008] Furthermore, the specific steps of step S2 include: inserting the first test line that outputs the reverse suppression current into the calibration ground current sensor and the ground current sensor to be calibrated, and when the inspection device host completes the waveform analysis of the background signal, reverses its waveform phase by 180° and outputs it through the second test line, causing reverse suppression of the background signal. At the same time, the calibration ground current sensor also synchronously measures the background value after reverse suppression to ensure that the suppressed background value meets the on-site inspection of the characteristic value current under the small signal range.

[0009] Furthermore, the specific steps of step S3 include: after disconnecting the calibrated ground current sensor and the inspected equipment from the background, connecting them to the inspection device host through a data communication line. At this time, under the condition that the suppressed background value meets the characteristic value current in the small signal range, the inspection device host outputs the characteristic value current signal in the small signal range through the test line, and the calibration ground current sensor and the calibrated ground current sensor simultaneously measure the characteristic value current signal, and perform a comparative inspection.

[0010] The beneficial effects of the present invention are: The present invention can provide a reverse suppression inspection method for a current online monitoring device. By reversely transforming the detection signal (background signal) of the real-time measurement data and utilizing the background reverse signal to suppress or offset the background signal, a current online monitoring measurement channel micro-background environment is created, and on-site inspection of characteristic values ​​in a small signal range is carried out. This method can not only ensure the inspection of characteristic values ​​in a small signal range of the current online monitoring device, but also improve the efficiency of on-site rapid inspection of the current online monitoring device, thereby ensuring that the on-site inspection of the current online monitoring device is scientific and efficient, and is of great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a working principle diagram of the present invention.

[0013] The attached figure indicates: 1: first test line, 2: second test line, 3: ground current sensor to be tested, 4: calibration ground current sensor, 5: calibration device host. DETAILED DESCRIPTION

[0014] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0015] Example 1 See also Figure 1 This embodiment discloses a reverse suppression inspection method for a current online monitoring device, including steps S1-S3.

[0016] First of all, it should be noted that the inspection device used in the reverse suppression inspection method includes an inspection device host 5, a calibration ground current sensor 4, a first test line 1 and a second test line 2. The first test line 1 is used to output a reverse suppression current, and the second test line 2 is used to output a characteristic value current in a small signal range after the reverse signal and the background signal are suppressed or offset.

[0017] S1. Firstly, the detection signal of the real-time measurement data, i.e., the background signal, is detected.

[0018] The specific steps of step S1 include: connecting the calibration ground current sensor 4 to the main unit of the inspection device, carrying out detection of real-time measurement data, and after obtaining the background signal, the main unit of the inspection device analyzes the waveform of the background signal.

[0019] S2. Perform a reverse transformation on the detected background signal to obtain a reverse signal, suppress or offset the reverse signal and the background signal, and ensure that the suppressed background value meets the on-site inspection of the characteristic value current in the small signal range, thereby creating a current-type online monitoring and measurement channel micro-background environment for subsequent on-site inspection of the characteristic value in the small signal range.

[0020] The specific steps of step S2 include: inserting the test line that outputs the reverse suppression current into the calibration ground current sensor 4 and the ground current sensor 3 to be verified. When the host of the inspection device completes the background current waveform analysis, the waveform phase is reversed by 180° and output through the test line, resulting in reverse suppression of the background current. At the same time, the calibration ground current sensor 4 also synchronously measures the background value after reverse suppression to ensure that the suppressed background value meets the on-site inspection of the characteristic value current in the small signal range.

[0021] S3. Carry out the inspection of the ground current sensor 3 to be checked.

[0022] The specific steps of step S3 include: disconnecting the ground current sensor 3 to be verified and the equipment to be verified from the background, and connecting them to the main unit of the inspection device through a data communication line. At this time, under the condition that the suppressed background value satisfies the characteristic value current in the small signal range, the main unit of the inspection device outputs the characteristic value current signal in the small signal range through the test line, and the ground current sensor 4 and the ground current sensor 3 to be verified simultaneously measure the characteristic value current signal, and perform a comparative inspection.

[0023] Example 2 This embodiment is based on the first embodiment and takes the inspection of the transformer core grounding current online monitoring device as an example to further illustrate the present invention.

[0024] Taking the inspection of the transformer core grounding current online monitoring device as an example, the grounding current sensor 4 is calibrated to detect the real-time measurement data, i.e., the background signal. When the detection result is 120 mA, because the characteristic value current signal in the small signal range is 5 mA, 10 mA, 20 mA, 50 mA, etc., it can be obtained that the background signal current is too large and does not meet the inspection under the characteristic value current signal in the small signal range.

[0025] At this time, after the host of the inspection device completes the background current waveform analysis, the phase of its waveform is reversed by 180°, and the background value is reduced to below 5 mA by suppressing or offsetting the phase reversal and phase shift (used to compensate for the delay time). Then, the host of the inspection device begins to output characteristic value current signals in the small signal range of 5 mA, 10 mA, 20 mA, 50 mA, etc. in sequence, and the calibration ground current sensor 4 and the ground current sensor 3 to be verified measure the characteristic value current signal at the same time, and compare and verify the test results of the calibrated ground current sensor and the ground current sensor 3 to be verified. When the measured data is the same or similar to the output signal, the inspection of the characteristic value in the small signal range of the current type online monitoring device can be guaranteed, indicating that the measurement result of the ground current sensor 3 to be verified is accurate and reliable, and the measurement accuracy of the ground current sensor 3 to be verified in the small signal range can be verified.

[0026] The above specific implementation modes are used to illustrate the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A reverse suppression test method for a current online monitoring device, characterized in that: The following steps are involved: S1. Detecting the background signal of real-time measurement data; S2, performing a reverse transformation on the detected background signal to obtain a reverse signal, suppressing or offsetting the reverse signal and the background signal, and ensuring that the suppressed background value meets the on-site inspection of the characteristic value current in the small signal range; S3. Carry out inspection of the ground current sensor being tested.

2. A reverse suppression test method for a current online monitoring device according to claim 1, characterized in that: The inspection device used in the reverse suppression inspection method includes an inspection device host, a calibration ground current sensor, a first test line and a second test line. The first test line is used to output a reverse suppression current, and the second test line is used to output a characteristic value current in a small signal range after the reverse signal and the background signal are suppressed or offset.

3. A reverse suppression test method for a current online monitoring device according to claim 2, characterized in that: The specific steps of step S1 include: connecting the calibration ground current sensor to the main unit of the inspection device, and carrying out detection of the detection signal of the real-time measurement data, wherein the detection signal of the real-time measurement data is the background signal of the real-time measurement data. After obtaining the background signal, the main unit of the inspection device analyzes the waveform of the background signal.

4. A reverse suppression test method for a current online monitoring device according to claim 3, characterized in that: The specific steps of step S2 include: inserting the first test line that outputs the reverse suppression current into the calibration ground current sensor and the ground current sensor to be calibrated. When the host of the inspection device completes the waveform analysis of the background signal, its waveform phase is reversed by 180° and output through the second test line, resulting in reverse suppression of the background signal. At the same time, the calibration ground current sensor also synchronously measures the background value after reverse suppression to ensure that the suppressed background value meets the on-site inspection of the characteristic value current under the small signal range.

5. A reverse suppression test method for a current online monitoring device according to claim 4, characterized in that: The specific steps of step S3 include: disconnecting the ground current sensor to be verified and the equipment to be verified from the background, and connecting them to the main unit of the inspection device through a data communication line. At this time, under the condition that the suppressed background value satisfies the characteristic value current in the small signal range, the main unit of the inspection device outputs the characteristic value current signal in the small signal range through the test line, and the calibration ground current sensor and the ground current sensor to be verified simultaneously measure the characteristic value current signal, and perform a comparative inspection.

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