CN114280429A - GIS partial discharge detection device - Google Patents
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Abstract
The invention is suitable for the technical field of GIS detection, and provides a GIS partial discharge detection device, which comprises: the system comprises a synchronous signal acquisition module, a plurality of synchronous signal receiving modules and a plurality of ultrahigh frequency sensors, wherein the synchronous signal receiving modules are connected with the ultrahigh frequency sensors in a one-to-one correspondence manner; the synchronous signal acquisition module is used for sensing a certain alternating current voltage signal of the target GIS equipment, extracting a synchronous signal from the alternating current voltage signal and sending the synchronous signal to each synchronous signal receiving module in a wireless communication mode; each synchronous signal receiving module is used for receiving a synchronous signal and sending the synchronous signal to the ultrahigh frequency sensor connected with the synchronous signal receiving module, so that each ultrahigh frequency sensor synchronously acquires the partial discharge signal of the target GIS equipment according to the synchronous signal. The invention can ensure that the ultrahigh frequency sensors of each sampling point perform synchronous sampling, and avoids the problems of complex wiring and high cost caused by the traditional hard wiring mode.
Description
Technical Field
The invention belongs to the technical field of GIS detection, and particularly relates to a GIS partial discharge detection device.
Background
The ultrahigh frequency sensor is suitable for online detection of partial discharge of a GIS (GAS INSULATED SWITCHGEAR), finds numerous GIS insulation defects in field application, and plays an important role in ensuring safe and reliable operation of GIS equipment.
The high-precision synchronous sampling is a key for realizing partial discharge detection, sampling of all sampling points is synchronously performed, phasors calculated at the same moment have a uniform reference time reference, and phase relations can be directly compared. In the prior art, in order to synchronously sample the uhf sensors at each sampling point, a hard-wired mode is usually adopted to respectively introduce a synchronization signal to each of the uhf sensors, so that wiring is complex and costly, and labor and time costs are increased.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a GIS partial discharge detection apparatus, so as to solve the problems of complex wiring and high cost of the GIS partial discharge detection method in the prior art.
The embodiment of the invention provides a GIS partial discharge detection device, which comprises:
the system comprises a synchronous signal acquisition module, a plurality of synchronous signal receiving modules and a plurality of ultrahigh frequency sensors, wherein the synchronous signal receiving modules are connected with the ultrahigh frequency sensors in a one-to-one correspondence manner;
the synchronous signal acquisition module is used for sensing a certain alternating current voltage signal of the target GIS equipment, extracting a synchronous signal from the alternating current voltage signal and sending the synchronous signal to each synchronous signal receiving module in a wireless communication mode;
each synchronous signal receiving module is used for receiving a synchronous signal and sending the synchronous signal to the ultrahigh frequency sensor connected with the synchronous signal receiving module, so that each ultrahigh frequency sensor synchronously acquires the partial discharge signal of the target GIS equipment according to the synchronous signal.
Optionally, the synchronization signal obtaining module sends a synchronization message to each synchronization signal receiving module at each rising edge time of the synchronization signal, and each synchronization signal receiving module generates the synchronization signal according to the synchronization message.
Optionally, the time tick message includes a clock message and a time tick command;
the synchronous signal acquisition module firstly sends a clock message to each synchronous signal receiving module; each synchronous signal receiving module enters a synchronous waiting state after receiving the clock message;
after confirming that each synchronous signal receiving module is in a synchronous waiting state, the synchronous signal acquisition module sends a time synchronization command to each synchronous signal receiving module; after receiving the lead code of the time setting command, each synchronous signal receiving module interrupts the receiving of the time setting command and generates a synchronous signal according to the lead code of the time setting command and the clock message.
Optionally, the synchronization signal acquiring module is further configured to:
before sending the time setting message to each synchronous signal receiving module, sending a wake-up instruction to each synchronous signal receiving module to wake up the synchronous signal receiving module in a low-power consumption standby state.
Optionally, the synchronization signal acquiring module includes:
the device comprises a synchronous voltage acquisition unit, a band-pass filter, a comparator and a first micro-control unit;
the synchronous voltage acquisition unit is connected with the band-pass filter, the band-pass filter is connected with the comparator, and the comparator is connected with the first micro-control unit;
the synchronous voltage acquisition unit is used for sensing a certain alternating current voltage signal of the target GIS equipment and sending the alternating current voltage signal to the band-pass filter;
the band-pass filter is used for filtering interference signals in the alternating voltage signals and sending the alternating voltage signals with the interference signals filtered to the comparator;
the comparator is used for converting the alternating voltage signal from a sine wave signal into a square wave signal to obtain a synchronous signal and sending the synchronous signal to the first micro-control unit;
the first micro-control unit is used for sending a time synchronization message to each synchronous signal receiving module at each rising edge moment of the synchronous signal.
Optionally, the synchronization signal receiving module includes:
the second micro-control unit and the signal amplifier;
the second micro-control unit is connected with a signal amplifier, and the signal amplifier is connected with an ultrahigh frequency sensor corresponding to the synchronous signal receiving module;
the second micro-control unit is used for receiving and analyzing the time setting message to obtain a synchronous signal and sending the synchronous signal to the signal amplifier;
the signal amplifier is used for amplifying the synchronous signal and sending the amplified synchronous signal to the ultrahigh frequency sensor correspondingly connected with the signal amplifier.
Optionally, the synchronization signal acquiring module further includes:
a first power supply unit;
the first power supply unit is used for supplying power to the synchronous voltage acquisition unit, the band-pass filter, the comparator and the first micro-control unit.
Optionally, the synchronization signal receiving module further includes:
a second power supply unit;
the second power supply unit is used for supplying power to the second micro-control unit and the signal amplifier.
Optionally, the signal frequency of the synchronization signal is 50 hz.
Optionally, the sampling frequency of the synchronization signal acquisition module is 8 kHz.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the GIS partial discharge detection device provided by the embodiment of the invention, a synchronous signal acquisition module is used for sensing a certain phase of alternating voltage signal of target GIS equipment, a synchronous signal is extracted from the alternating voltage signal, then the synchronous signal is sent to the synchronous signal receiving modules which are correspondingly connected with the ultrahigh frequency sensors one by one in a wireless communication mode, and the synchronous signal receiving modules receive the synchronous signal and then send the synchronous signal to the ultrahigh frequency sensors which are respectively connected, so that synchronous sampling of the ultrahigh frequency sensors at each sampling point is ensured, and the problems of complex wiring and high cost caused by a traditional hard wiring mode are solved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a GIS partial discharge detection apparatus provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a synchronization signal acquisition module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a synchronization signal receiving module according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The ultrahigh frequency detection method is suitable for GIS partial discharge live detection and online monitoring, finds numerous GIS insulation defects in field application, and plays an important role in ensuring safe and reliable operation of GIS equipment. The ultrahigh frequency sensor is a key device in partial discharge detection, and the quality, the arrangement position and the number of the ultrahigh frequency sensor directly determine the detection sensitivity and the effective detection range. In order to ensure the detection sensitivity, it is important to strengthen the quality control of the ultrahigh frequency sensor and to operate the ultrahigh frequency sensor for periodic inspection.
The high-precision synchronous sampling is a key for realizing GIS partial discharge detection, sampling of each sampling point is synchronously performed, phasors calculated at the same moment have a uniform reference time reference, and phase relations can be directly compared. In the prior art, the synchronous signal is generally led to the ultrahigh frequency sensor in a hard-wired mode, so that the wiring is complex and expensive, and the labor cost and the time cost are increased. Therefore, it is necessary to develop a wireless synchronization signal acquisition device with a built-in uhf sensor, which can provide a synchronization signal to the uhf sensor without hard wiring.
Referring to fig. 1, an embodiment of the present invention provides a GIS partial discharge detection apparatus, including:
the system comprises a synchronous signal acquisition module 11, a plurality of synchronous signal receiving modules 12 and a plurality of ultrahigh frequency sensors 13, wherein the synchronous signal receiving modules 12 are connected with the ultrahigh frequency sensors 13 in a one-to-one correspondence manner.
The synchronization signal acquisition module 11 is configured to sense an ac voltage signal of a certain phase of the target GIS device, extract a synchronization signal from the ac voltage signal, and send the synchronization signal to each synchronization signal reception module 12 in a wireless communication manner. Each of the synchronous signal receiving modules 12 is configured to receive a synchronous signal and send the synchronous signal to the ultrahigh frequency sensors 13 connected to each other, so that each of the ultrahigh frequency sensors 13 synchronously acquires a local discharge signal of the target GIS device according to the synchronous signal.
In the embodiment of the present invention, the synchronization signal receiving module 12 is used for receiving the synchronization signal, and therefore, the synchronization signal receiving module 12 may be directly embedded in the uhf sensor 13. The ultrahigh frequency sensors 13 are dispersedly arranged at sampling measurement points of the target GIS equipment. The synchronous signal acquisition module 11 can acquire an alternating voltage signal of a certain phase of the three phases of the target GIS device A, B, C, extract a synchronous signal from the acquired alternating voltage signal, and send the synchronous signal to each ultrahigh frequency sensor 13 in a wireless communication mode, and each ultrahigh frequency sensor 13 can realize high-precision synchronous sampling according to the synchronous signal.
Therefore, according to the GIS partial discharge detection device provided by the embodiment of the invention, the synchronous signal acquisition module is used for sensing a certain alternating current voltage signal of the target GIS equipment, the synchronous signal is extracted from the alternating current voltage signal, then the synchronous signal is sent to the synchronous signal receiving modules which are correspondingly connected with the ultrahigh frequency sensors one by one in a wireless communication mode, and the synchronous signal receiving modules receive the synchronous signal and then send the synchronous signal to the ultrahigh frequency sensors which are respectively connected, so that synchronous sampling of the ultrahigh frequency sensors at each sampling point is ensured, and the problems of complex wiring and high cost caused by the traditional hard wiring mode are solved.
Optionally, the synchronization signal obtaining module 11 sends a time tick message to each synchronization signal receiving module 12 at each rising edge time of the synchronization signal, and each synchronization signal receiving module 12 generates the synchronization signal according to the time tick message.
Optionally, the signal frequency of the synchronization signal is 50 hz.
In the embodiment of the present invention, the synchronization signal extracted from the ac voltage signal by the synchronization signal acquisition module 11 is a square wave signal with a frequency of 50hz, and the synchronization signal acquisition module 11 sends a time tick message to each synchronization signal receiving module 12 at each rising edge time of the synchronization signal, and each synchronization signal receiving module 12 receives and analyzes the time tick message to generate the synchronization signal, so as to implement wireless transmission of the synchronization signal.
Optionally, the time tick message includes a clock message and a time tick command.
The synchronization signal acquisition module 11 first sends the clock message to each synchronization signal receiving module 12.
Each synchronization signal receiving module 12 enters a synchronization waiting state after receiving the clock message.
After confirming that each synchronization signal receiving module 12 is in the synchronization waiting state, the synchronization signal acquiring module 11 sends a time synchronization command to each synchronization signal receiving module 12.
After receiving the preamble of the time tick command, each synchronization signal receiving module 2 interrupts receiving the time tick command, and generates a synchronization signal according to the preamble of the time tick command and the clock packet.
In the embodiment of the invention, considering that the wireless transmission process of the time tick messages has transmission delay and analysis delay, if the time tick messages are directly transmitted and analyzed to generate the synchronous signals, the synchronous sampling precision is influenced due to the existence of message transmission errors and message analysis errors (the maximum error can be 300 us). Therefore, in the embodiment of the invention, the time tick message is divided into the clock message and the time tick command, the clock message is transmitted first and then sampling synchronization is performed, the lead code interrupt is utilized, only the lead code of the time tick command is received and analyzed to perform clock tick, and the transmission and analysis errors of the message are greatly reduced by combining the clock message and the lead code.
Specifically, the process may be as follows:
(1) the synchronous signal acquisition module 11 sends a broadcast clock message to each of the downward-hanging synchronous signal receiving modules 12, and issues current clock data; (2) after receiving the clock message, each synchronization signal receiving module 12 saves the clock data and enters a synchronization waiting state; (3) the synchronization signal obtaining module 11 determines whether each synchronization signal receiving module 12 is in a synchronization waiting state according to the determination signal returned by each synchronization signal receiving module 12, and sends a broadcast time tick command to each synchronization signal receiving module 12 after each synchronization signal receiving module 12 is in the synchronization waiting state; (4) the synchronization signal receiving modules 12 in the synchronization waiting state generate an interrupt after receiving the preamble of the time tick command, and at this time, the analysis error between the time tick commands received by each synchronization signal receiving module 12 is the minimum; (5) each synchronization signal receiving module 12 generates a synchronization signal according to the preamble of the time tick command and the clock message.
Optionally, the synchronization signal acquiring module 11 is further configured to:
before sending the time tick message to each synchronization signal receiving module 12, a wake-up instruction is sent to each synchronization signal receiving module 12 to wake up the synchronization signal receiving module 12 in a low power consumption standby state.
In the embodiment of the present invention, the synchronization signal receiving module 12 may have two states, i.e., an awake state and a low power consumption standby state. The synchronization signal receiving module 12 cannot receive and transmit data in a low power consumption standby state. Because the synchronization signal acquisition module 11 may be in a low power consumption standby state when sending the synchronization signal to each synchronization signal reception module 12, before sending the synchronization signal, the synchronization signal acquisition module 11 may continuously send a wakeup message to each synchronization signal reception module 12, the sending interval may be 20ms, the synchronization signal reception module 12 sends an ACK confirmation message to the synchronization signal acquisition module 11 after receiving the wakeup message, and simultaneously switches itself to a reception state, and the synchronization signal acquisition module 11 sends a time synchronization message after collecting the ACK confirmation messages of all the synchronization signal reception modules 12.
For more detailed description of the GIS partial discharge detection apparatus, the embodiment of the present invention provides a detailed structural schematic diagram of the synchronization signal acquisition module 11 and the synchronization signal receiving module 12, please refer to fig. 2 and fig. 3 together.
Optionally, the synchronization signal acquiring module 11 includes:
a synchronous voltage acquisition unit 111, a band pass filter 112, a comparator 113 and a first micro control unit 114.
The synchronization voltage acquisition unit 111 is connected to the band pass filter 112, the band pass filter 112 is connected to the comparator 113, and the comparator 113 is connected to the first micro control unit 114.
The synchronous voltage acquisition unit 111 is configured to sense an ac voltage signal of a certain phase of the target GIS device, and send the ac voltage signal to the band-pass filter 112.
The band-pass filter 112 is configured to filter an interference signal in the ac voltage signal, and send the ac voltage signal with the interference signal filtered to the comparator 113.
The comparator 113 is configured to convert the ac voltage signal from a sine wave signal to a square wave signal, obtain a synchronization signal, and send the synchronization signal to the first micro-control unit 114.
The first micro-control unit 114 is configured to send a time tick message to each synchronization signal receiving module 12 at each rising edge time of the synchronization signal.
Optionally, the synchronization signal receiving module 12 includes:
a second micro-control unit 121 and a signal amplifier 122.
The second micro-control unit 121 is connected to a signal amplifier 122, and the signal amplifier 122 is connected to the uhf sensor 13 corresponding to the synchronization signal receiving module 12.
The second micro control unit 121 is configured to receive and analyze the time synchronization packet, obtain a synchronization signal, and send the synchronization signal to the signal amplifier 122.
The signal amplifier 122 is configured to amplify the synchronization signal and send the amplified synchronization signal to the ultrahigh frequency sensor 13 connected thereto.
In the embodiment of the invention, each synchronous voltage acquisition unit 111 acquires an alternating voltage signal of any phase of the target GIS equipment, and only a sinusoidal voltage signal with the frequency of 50Hz is reserved by filtering interference signals through a band-pass filter 112. The comparator 113 converts the sinusoidal voltage signal into a square wave signal, resulting in a synchronization signal. The first micro-control unit 114 sends a time tick at each rising edge of the synchronization signal. The second micro-control unit 121 receives and analyzes the time tick messages, generates a synchronization signal according to the time tick messages, and sends the synchronization signal to the signal amplifier 122, and the signal amplifier 122 amplifies the synchronization signal and sends the amplified synchronization signal to the uhf sensor 13.
In order to realize the phase-frequency checking function of the synchronous voltage signal, the first micro-control unit 114 and the second micro-control unit 121 can both adopt CC1350 single-chip microcomputers, and when the receiving capability is met, the transmission distance does not affect the transmission delay. The CC1350 single chip computer makes the following rules for the format of the data packet: a preamble; a synchronization code; length bytes or fixed controllable packet length; an optional address byte; a payload; an optional 2BCRC check code. Therefore, the minimum message byte number is 10 bytes, and the transmission time is 320 us. And, the CC1350 single chip belongs to an economic and efficient type ultra-low power consumption 2.4GHz device, has extremely low active RF and Microcontroller (MCU) current consumption, can ensure excellent battery service life except a flexible low power consumption mode, and is suitable for remote operation powered by a small button battery and energy collection type application.
Specifically, when the CC1350 single chip is set to the receiving state, the CC1350 single chip may receive data in the 2.4GHz band, when the CC1350 single chip is set to the sending state, the CC1350 single chip may send data in the 2.4GHz band, and when the CC1350 is set to the low power standby state, the CC1350 single chip is in the low power mode and is not capable of receiving and sending data. The synchronization signal acquisition module 11 performs general configuration on the CC1350 single chip microcomputer when being initialized, defaults to be in a low power consumption mode, and cannot receive and send data, the CPU can set the CC1350 single chip microcomputer to be in a receiving state every 5 seconds, the size of a receiving window can be 600ms, and then sets the CC1350 single chip microcomputer to be in a low power consumption mode, and sets the CC1350 single chip microcomputer to be in a sending state when the CPU has actively sent data, and sends data to other terminals. Specifically, each synchronization signal receiving module 12 performs wireless interaction between the second micro control unit 121 and the first micro control unit 114 of the synchronization signal acquiring module 11, so as to achieve wakeup operation and synchronization signal transmission.
Optionally, the synchronization signal acquiring module 11 further includes:
a first power supply unit 115.
The first power supply unit 115 is used for supplying power to the synchronous voltage acquisition unit 111, the band-pass filter 112, the comparator 113 and the first micro control unit 114.
Optionally, the synchronization signal receiving module 12 further includes:
a second power supply unit 123.
The second power supply unit 123 is used for supplying power to the second micro control unit 121 and the signal amplifier 122.
In the embodiment of the present invention, since the synchronization signal acquiring module 11 and each synchronization signal receiving module 12 are independent, it is very necessary to provide an independent power supply for the synchronization signal acquiring module 11 for convenience of use. If the ultrahigh frequency sensor 13 is built in each of the synchronization signal receiving modules 12, the second power supply unit 123 can be used as a power supply for both the synchronization signal receiving module 12 and the ultrahigh frequency sensor 13. The power supply source can be selected from button cell, dry cell, rechargeable battery, etc.
Optionally, the sampling frequency of the synchronization signal acquisition module 11 is 8 kHz.
In the embodiment of the invention, the synchronous signal acquisition module 11 adopts a 32K high-precision crystal oscillator, the crystal oscillator must meet a high-precision condition, otherwise, the synchronous signal acquisition module 11 itself brings errors.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A GIS partial discharge detection apparatus, comprising:
the system comprises a synchronous signal acquisition module, a plurality of synchronous signal receiving modules and a plurality of ultrahigh frequency sensors, wherein the synchronous signal receiving modules are connected with the ultrahigh frequency sensors in a one-to-one corresponding manner;
the synchronous signal acquisition module is used for sensing a certain alternating current voltage signal of the target GIS equipment, extracting a synchronous signal from the alternating current voltage signal and sending the synchronous signal to each synchronous signal receiving module in a wireless communication mode;
each synchronous signal receiving module is used for receiving the synchronous signals and sending the synchronous signals to the ultrahigh frequency sensors which are connected with each synchronous signal receiving module, so that each ultrahigh frequency sensor synchronously collects partial discharge signals of target GIS equipment according to the synchronous signals.
2. The GIS partial discharge detection device of claim 1, wherein the synchronization signal acquisition module sends a time tick message to each synchronization signal reception module at each rising edge of the synchronization signal, and each synchronization signal reception module generates the synchronization signal according to the time tick message.
3. The GIS partial discharge detection apparatus of claim 2, wherein the time tick message comprises a clock message and a time tick command;
the synchronous signal acquisition module firstly sends the clock message to each synchronous signal receiving module; each synchronous signal receiving module enters a synchronous waiting state after receiving the clock message;
after confirming that each synchronous signal receiving module is in a synchronous waiting state, the synchronous signal acquisition module sends the time synchronization command to each synchronous signal receiving module; and after receiving the lead code of the time setting command, each synchronous signal receiving module interrupts the receiving of the time setting command and generates the synchronous signal according to the lead code of the time setting command and the clock message.
4. The GIS partial discharge detection apparatus of claim 3, wherein the synchronization signal acquisition module is further configured to:
before sending the time setting message to each synchronous signal receiving module, sending a wake-up instruction to each synchronous signal receiving module to wake up the synchronous signal receiving module in a low-power consumption standby state.
5. The GIS partial discharge detection apparatus of claim 1, wherein the synchronization signal acquisition module comprises:
the device comprises a synchronous voltage acquisition unit, a band-pass filter, a comparator and a first micro-control unit;
the synchronous voltage acquisition unit is connected with the band-pass filter, the band-pass filter is connected with the comparator, and the comparator is connected with the first micro-control unit;
the synchronous voltage acquisition unit is used for sensing a certain alternating current voltage signal of the target GIS equipment and sending the alternating current voltage signal to the band-pass filter;
the band-pass filter is used for filtering interference signals in the alternating voltage signals and sending the alternating voltage signals with the interference signals filtered to the comparator;
the comparator is used for converting the alternating voltage signal from a sine wave signal to a square wave signal to obtain the synchronous signal and sending the synchronous signal to the first micro-control unit;
the first micro-control unit is used for sending a time synchronization message to each synchronous signal receiving module at each rising edge moment of the synchronous signal.
6. The GIS partial discharge detection apparatus of claim 5, wherein the synchronization signal receiving module comprises:
the second micro-control unit and the signal amplifier;
the second micro-control unit is connected with the signal amplifier, and the signal amplifier is connected with the ultrahigh frequency sensor corresponding to the synchronous signal receiving module;
the second micro-control unit is used for receiving and analyzing the time setting message to obtain the synchronous signal and sending the synchronous signal to the signal amplifier;
the signal amplifier is used for amplifying the synchronous signals and sending the amplified synchronous signals to the ultrahigh frequency sensors correspondingly connected with the signal amplifier.
7. The GIS partial discharge detection apparatus of claim 5, wherein the synchronization signal acquisition module further comprises:
a first power supply unit;
the first power supply unit is used for supplying power to the synchronous voltage acquisition unit, the band-pass filter, the comparator and the first micro-control unit.
8. The GIS partial discharge detection apparatus of claim 6, wherein the synchronization signal receiving module further comprises:
a second power supply unit;
the second power supply unit is used for supplying power to the second micro-control unit and the signal amplifier.
9. The GIS partial discharge detection device of any of claims 1-8, wherein the synchronization signal has a signal frequency of 50 hz.
10. The GIS partial discharge detection device of any of claims 1-8, wherein the sampling frequency of the synchronization signal acquisition module is 8 kHz.
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