Photon counting software and hardware measurement platform based on GIS internal metal foreign matter screening

Abstract

The invention discloses a photon counting software and hardware measurement platform based on GIS internal metal foreign matter screening, and belongs to the technical field of GIS defect detection. Photon signals indicating whether foreign matters exist in a real GIS cavity are generated and collected through a hardware collection device; the method for screening the metal foreign matters in the real GIS cavity comprises the following steps: S1, firstly, starting a hardware acquisition device to carry out data acquisition; s2, after the computer receives the data from the data acquisition card, processing the data, namely data acquisition circulation and data processing circulation; and S3, outputting and displaying the processed data result. The photon counting software and hardware measurement platform based on GIS internal metal foreign matter screening has higher sensitivity and anti-interference capability, and can quantify the degree of harm of different types of metal foreign matters at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of GIS defect detection, and in particular to a photon counting software and hardware measurement platform based on the screening of metal foreign objects inside GIS. Background Art

[0002] In the prior art, it is inevitable to generate metal foreign objects during the processes of production, transportation, assembly and commissioning, operation and maintenance of gas-insulated metal-enclosed switchgear (GIS). These metal foreign objects will distort the original electric field inside the GIS cavity, and in severe cases, it will lead to faults such as surface discharge and flashover of GIS insulators or conductor arcing.

[0003] The main detection methods for GIS equipment at home and abroad are mainly pulse current method, ultra-high frequency method, ultrasonic method, etc. However, the pulse current method has a low measurement frequency, a narrow frequency band, less information content, and is easily affected by ground wire current and space electromagnetic interference, making it difficult to be applied to on-site testing; the ultra-high frequency method is easily affected by complex external electromagnetic noise, is insensitive to some insulation defects, and the discharge amount is difficult to calibrate; the ultrasonic method signal decays rapidly with distance and is easily affected by the vibration interference of other equipment operations. Therefore, it is very difficult to be effectively implemented. The partial discharge caused by metal foreign objects inside the GIS cavity is very tiny (for 500 0.5mm particles, the average discharge amount within 150 minutes is 0.236 pC*). The above methods have low sensitivity and it is difficult to screen out the particles before they cause harm.

[0004] Therefore, it is urgent to study a technology for highly sensitive detection of metal foreign object defects inside the GIS cavity, which can screen out the metal foreign objects before they cause harm and provide guarantee for the safe operation of GIS equipment. Summary of the Invention

[0005] The purpose of the present invention is to provide a photon counting software and hardware measurement platform based on the screening of metal foreign objects inside GIS, which has higher sensitivity and anti-interference ability, and can quantify the harm degree of different types of metal foreign objects at the same time.

[0006] To achieve the above purpose, the present invention provides a photon counting software and hardware measurement platform based on the screening of metal foreign objects inside GIS. The hardware acquisition device includes a high-voltage power supply, a true-type GIS cavity, a photon probe, a counting board, a data acquisition card and a computer; the high-voltage power supply is electrically connected to the true-type GIS cavity. There are two situations of no metal foreign objects and the presence of metal foreign objects respectively inside the true-type GIS cavity. An observation window is provided at the end of the side of the true-type GIS cavity, and the photon probe is arranged at the observation window; the counting board is electrically connected to the photon probe and is used to supply power to the photon probe. The data acquisition card is electrically connected to the photon probe and is used to collect the pulse signal output by the photon probe and collect the AC synchronous signal at the same time; the computer is electrically connected to the data acquisition card and is used to process the collected data.

[0007] Preferably, the screening method for metal foreign objects inside the true-type GIS cavity includes the following steps:

[0008] S1. First, start the hardware acquisition device to perform data acquisition;

[0009] S2. After the computer receives the data from the data acquisition card, process the data, which are respectively the data acquisition loop and the data processing loop;

[0010] S3. Output and display the processed data results.

[0011] Preferably, in S1, before the experiment, wipe the true-type GIS cavity thoroughly, and simulate the situations of no metal foreign objects and the presence of metal foreign objects respectively; after the simulation is completed, apply voltage with a high-voltage power supply to make the true-type GIS cavity reach the preset electric field environment, generate micro-discharge signals inside the true-type GIS cavity and simultaneously generate photon signals, start the counting board to supply power to the photon probe, and at the same time start the computer and open the internal measurement software; use the photon probe to collect the photon signals transmitted through the observation window, convert the detected photon signals into continuous pulses with a pulse width of 30 ns, the data acquisition card collects the pulse signals output by the photon probe, simultaneously collects the AC synchronous signal, and sends the collected data to the computer.

[0012] Preferably, the data acquisition loop in S2 is the upper computer driver program of the data acquisition card, which is responsible for collecting the on-board memory data in the data acquisition card into the computer; the data acquisition card drive part in the data acquisition loop is set to be triggered to run, and only runs when the data acquisition card collects the rising edge of the synchronous signal, collects one power frequency phase cycle, and generates an array of photon signals.

[0013] Preferably, the data processing loop in S2 receives the array of photon signals in the data acquisition loop and processes the data in the array of photon signals through the peak search function.

[0014] Preferably, the processing method of the peak search function is: compare the size relationship between each number in the array with the number before and after it in turn. If a certain number is greater than both the previous number and the next number, and is greater than the set threshold, then this number is considered as a peak of a photon pulse, and record the position of this pulse in the array; finally, increase the number of pulses at the corresponding position in the PRPC map by 1, thereby completing the generation of the PRPC map.

[0015] Preferably, in S3, synchronously output and display the trigger signal, the real-time number of photons, the cumulative number of photons, and the PRPC map.

[0016] Therefore, the beneficial effects of the present invention adopting the above-mentioned photon counting software and hardware measurement platform for screening metal foreign objects inside GIS are as follows:

[0017] (1) Strong anti-interference ability. The sensor collects photon signals, and the transmission of photon signals is not interfered by electromagnetic and vibration noises.

[0018] (2) High sensitivity. It can detect tiny partial discharge signals caused by particles (500 particles of 0.5 mm, with an average discharge amount of 0.236 pC* within 150 minutes), and micro-discharges can be measured at a relatively low voltage.

[0019] (3) It can screen for metal foreign objects inside GIS by real-time photon counting, cumulative photon counting, and phase spectrum analysis of the hazards of metal particles.

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the hardware measurement device of the embodiment of the photon counting software and hardware measurement platform for screening metal foreign objects inside GIS according to the present invention;

[0022] Figure 2 is a flow chart of photon signal pulse processing of the embodiment of the photon counting software and hardware measurement platform for screening metal foreign objects inside GIS according to the present invention;

[0023] Figure 3 is a peak search function diagram of the embodiment of the photon counting software and hardware measurement platform for screening metal foreign objects inside GIS according to the present invention;

[0024] Figure 4 is the operation diagram of phase measurement of the photon measurement software in this embodiment; where (a) is the power frequency sine trigger signal, (b) is the synchronous acquisition of photon signals, and (c) is the PRPC image obtained by counting 150 cycles;

[0025] Figure 5 is the display interface diagram of the photon measurement software for screening metal foreign objects inside the actual GIS cavity in this embodiment;

[0026] Figure 6 is the detection result diagram of the real-time photon number corresponding to the defect sample in this embodiment;

[0027] Figure 7 is the detection result diagram of the cumulative photon number corresponding to the defect sample in this embodiment;

[0028] Figure 8 is the detection result diagram of the photon counting phase corresponding to the defect sample in this embodiment.

[0029] Reference Signs

[0030] 1. High-voltage power supply; 2. True-type GIS cavity; 3. Observation window; 4. Photon probe; 5. Counting board; 6. Data acquisition card; 7. Computer. Detailed implementation mode

[0031] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0033] Embodiment 1

[0034] As Figure 1 shown, the present invention provides a photon counting software and hardware measurement platform for screening metal foreign objects inside GIS. The hardware acquisition device includes a high-voltage power supply 1, a true-type GIS cavity 2, a photon probe 4, a counting board 5, a data acquisition card 6 and a computer 7.

[0035] Among them, the high-voltage power supply 1 is electrically connected to the true-type GIS cavity 2. The high-voltage power supply 1 in this embodiment is a voltage source of 50 kV, which is used to provide an alternating high voltage to make the true-type GIS cavity in a certain electric field environment. The true-type GIS cavity 2 is a true-type GIS test cavity of 110 kV. Inside the true-type GIS cavity 2, there are two situations: without metal foreign objects and with metal foreign objects. When there are foreign objects, the original electric field will be distorted, making the gas ionization and luminescence more intense.

[0036] An observation window 3 is provided at the end of the side of the true-type GIS cavity 2. In this embodiment, the material of the observation window 3 is plexiglass, so that the photon signal can pass through the observation window 3 and be captured by the photon probe 4.

[0037] The photon probe 4 is set at the observation window 3 and is in a dark room, capable of collecting photon signals in real time. In this embodiment, the model of the photon probe 4 is H8259-01. The counting board 5 is electrically connected to the photon probe 4 and is used to supply power to the photon probe 4, and its model is C8855-01. The data acquisition card 6 is electrically connected to the photon probe 4 and is used to collect the pulse signals output by the photon probe 4 and simultaneously collect the AC synchronous signals, and its model is PS2000a. The computer 7 is electrically connected to the data acquisition card 6 and is used to process the collected data.

[0038] The screening method for metal foreign objects inside the true-type GIS cavity includes the following steps:

[0039] S1. First, start the hardware acquisition device to perform data acquisition.

[0040] Specifically, before the experiment, the true-type GIS cavity 2 is wiped thoroughly, and the situations of no metal foreign objects and the presence of metal foreign objects are respectively simulated. After the simulation is completed, the high-voltage power supply 1 is used to apply voltage so that the true-type GIS cavity 2 reaches the preset electric field environment, causing micro-discharge signals to be generated inside the true-type GIS cavity 2 and simultaneously accompanied by the generation of photon signals. Start the counting board 5 to supply power to the photon probe 4, and at the same time start the computer 7 and open the internal measurement software. Use the photon probe 4 to collect the photon signals transmitted through the observation window 3 and convert the detected photon signals into continuous pulses with a pulse width of 30 ns. One photon corresponds to one pulse, the maximum pulse resolution is 30 ns, and the amplitude is 5 V. This pulse waveform is sampled by the data acquisition card 6 at a sampling rate of 62.5 M / s. The data acquisition card 6 collects the pulse signals output by the photon probe 4 and simultaneously collects the AC synchronous signals, and sends the collected data to the computer 7. The operation mode of the data acquisition card 6 is the trigger mode. In this operation mode, the data acquisition card 6 will first store the data in the on-board memory of the card, and then transfer the data to the computer 7 after the data storage is full.

[0041] S2. After the computer receives the data from the data acquisition card, it processes the data, as Figure 2 shown, which are the data acquisition loop and the data processing loop respectively.

[0042] The data acquisition loop is the upper computer driver program of the data acquisition card, responsible for collecting the data in the on-board memory of the data acquisition card into the computer. The data acquisition card 6 drive part in the data acquisition loop is set to run in trigger mode and only runs when the data acquisition card collects the rising edge of the synchronous signal, collecting one power frequency phase cycle and generating an array of photon signals.

[0043] The data processing loop receives the array of photon signals of the data acquisition loop and processes the data in the array of photon signals through the peak search function.

[0044] In the trigger mode of the data acquisition card 6, the original pulse waveform measured by the photon probe 4 is transmitted to the computer 7 in the form of an array of a certain length. The length of the array depends on the sampling rate of the data acquisition card 6. For example, taking a sampling rate of 62.5M / s as an example, the array length of a single power frequency cycle signal is 1.25M. The data acquisition loop processes this array of length 1.25M through a peak seeking function (such as Figure 3 shown).

[0045] The processing method of the peak seeking function is as follows: successively compare the size relationship between each number in the array and the number before and after it. If a number is both greater than the previous number and greater than the next number, and greater than the set threshold, then this number is considered as a peak of a photon pulse, and the position of this pulse in the array is recorded; finally, the number of pulses at the corresponding position in the PRPC map is increased by 1, thus completing the generation of the PRPC map, as Figure 4 shown.

[0046] S3. Output and display the processed data results, and synchronously output and display the trigger signal, real-time photon number, cumulative photon number, and PRPC map, as Figure 5 shown.

[0047] When the voltage applied by the high-voltage power supply 1 is 18kV, the metal foreign object detection result in the true-type GIS cavity 2 is as Figures 6 - 8 shown.

[0048] Therefore, the present invention adopts the above-mentioned photon counting software and hardware measurement platform based on the screening of metal foreign objects inside GIS, which has higher sensitivity and anti-interference ability, and can simultaneously quantify the harm degree of different types of metal foreign objects.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A photon counting software and hardware measurement platform based on metal foreign body screening inside GIS, characterized by: The hardware acquisition device includes a high-voltage power supply, a true GIS cavity, a photon probe, a counting board, a data acquisition card and a computer; the high-voltage power supply is electrically connected to the true GIS cavity, and two conditions are respectively set inside the true GIS cavity: no metal foreign matter and the presence of metal foreign matter. An observation window is set at the end of the side of the true GIS cavity, and the photon probe is set at the observation window; the counting board is electrically connected to the photon probe for powering the photon probe, and the data acquisition card is electrically connected to the photon probe for collecting the pulse signal output by the photon probe and collecting the AC synchronization signal at the same time; the computer is electrically connected to the data acquisition card for processing the collected data.

2. According to claim 1, a photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS is characterized by: The screening method for metallic foreign bodies inside the real GIS cavity includes the following steps: S1, first start the hardware acquisition device to collect data; S2, after receiving the data from the data acquisition card, the computer processes the data, which are respectively a data acquisition cycle and a data processing cycle; S3. Output and display the processed data results.

3. The photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS according to claim 2 is characterized by: In S1, the real GIS cavity was fully wiped before the experiment, and the situations of no metal foreign matter and presence of metal foreign matter were simulated respectively; after the simulation was completed, a high-voltage power supply was used to pressurize the real GIS cavity to reach the preset electric field environment, so that a micro-discharge signal and a photon signal were generated inside the real GIS cavity, and the counting board was started to power the photon probe, and the computer was started at the same time to open the internal measurement software; the photon probe was used to collect the photon signal transmitted through the observation window, and the detected photon signal was converted into a continuous pulse with a pulse width of 30ns, and the data acquisition card collected the pulse signal output by the photon probe, and collected the AC synchronization signal at the same time, and sent the collected data to the computer.

4. The photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS according to claim 2 is characterized by: The data acquisition loop in S2 is the host computer driver of the data acquisition card, which is responsible for collecting the onboard memory data in the data acquisition card into the computer; The data acquisition card driver part in the data acquisition cycle is set to trigger operation, and only runs when the data acquisition card collects the rising edge of the synchronization signal, collects a power frequency phase cycle, and generates a photon signal array.

5. The photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS according to claim 4 is characterized by: The data processing loop in S2 receives the photon signal array of the data acquisition loop and processes the photon signal array data through the peak finding function.

6. A photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS according to claim 5, characterized in that: The processing method of the peak-finding function is: compare the size relationship between each number in the array and the previous and next numbers in turn. If a number is larger than both the previous and next numbers, and larger than the set threshold, then this number is considered to be a photon pulse peak, and the position of the pulse in the array is recorded; finally, the number of pulses at the corresponding position in the PRPC spectrum is increased by 1, thereby completing the generation of the PRPC spectrum.

7. The photon counting software and hardware measurement platform based on metal foreign matter screening inside GIS according to claim 2 is characterized by: In S3, the synchronous output displays the trigger signal, real-time photon count, accumulated photon count and PRPC spectrum.

Images