CN213903711U - Distributed partial discharge detection system - Google Patents
Distributed partial discharge detection system Download PDFInfo
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- CN213903711U CN213903711U CN202022609732.4U CN202022609732U CN213903711U CN 213903711 U CN213903711 U CN 213903711U CN 202022609732 U CN202022609732 U CN 202022609732U CN 213903711 U CN213903711 U CN 213903711U
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Abstract
The utility model discloses a detecting system is put in distributing type office, put detecting element including server and many distributing type offices, detecting element is put in each distributing type office includes: the server is connected with the comprehensive communication unit, the comprehensive communication unit is connected with the distributed signal acquisition unit, and the distributed signal acquisition unit is respectively connected with the partial discharge acquisition sensor and the power frequency sensor through a BNC connector; the partial discharge acquisition sensor and the power frequency sensor are arranged on the cable body; the power supply unit supplies power for the comprehensive communication unit and the distributed signal acquisition unit. The utility model discloses can realize single-phase detection and three-phase while detecting, possess three kinds of mode of optical fiber network deployment, wireless network deployment and the wireless network deployment of synthesizing of optic fibre.
Description
Technical Field
The utility model relates to a detection technology field is put in the office, specifically is a detecting system is put in distributing type office.
Background
The electrical performance of even high voltage cables that have passed relevant tests can still suffer due to factors of accessory installation and transportation and field installation. Therefore, in order to ensure that the power grid can reliably supply power and avoid the influence on the whole power grid due to the tiny insulation defect, the power grid is subjected to a handover test before transportation and laying. According to the fault condition after the operation of a plurality of new construction cables in China, the cable quality can be directly detected by a cable handover test, but the partial discharge defect of the cable cannot be completely detected by the cable handover test, and the partial defect is also worsened. The performance and the quality of the cable can be determined as soon as possible through the handover test, some obvious defects can be found in time, but the detection range is very limited, and the partial discharge defects are difficult to find. Therefore, some problems cannot be handled in time, and further become more serious, so that the fault is more serious after the cable is put into operation formally, and the normal power supply of the power grid is influenced. Therefore, besides the handover test is actually performed, a local detection method and a local detection technology should be reasonably applied to timely and clearly identify and control some hidden insulation defects. According to specifications of a cable main insulation of 66kV and above in national power grid' test regulations on cable lines (Q/GDW11316-2014) and eighteen major accident prevention measures of the power grid (revised edition), an alternating current voltage withstand test is carried out, and partial discharge measurement should be carried out at the same time.
Generally, a high-voltage cable is subjected to an insulation voltage-withstand test, the peak value of the test voltage is 3 times of the rated phase voltage of the cable, and the test time is 60min, so that the field of the voltage-withstand test is extremely dangerous, testers are not recommended to be close to the cable, the test time is limited, and the partial discharge test on a group of connectors generally needs 10-15 min, so that the conventional partial discharge detection is performed in the voltage-withstand test, the detection time is short, the number of the detectable connectors is limited, and the danger is very large.
Through retrieval, China with the publication number of CN210323241U specially favorable for 14.4.2020, the device comprises a plurality of groups of distributed cable partial discharge detection units arranged on a cable line, wherein the groups of distributed cable partial discharge detection units are sequentially connected through optical fibers; one group of distributed cable partial discharge detection units are connected with an optical fiber communication controller through optical fibers, and the optical fiber communication controller is connected with a computer. According to the method, all distributed cable partial discharge detection units are respectively arranged at a cable line terminal or an intermediate joint, and multi-source multi-point partial discharge signals can be synchronously collected; and the system has the function of switching two networking modes of optical fiber and wireless 4G, and can be used for a user to select an optimal networking mode according to the field communication link environment. However, this patent cannot realize three-phase simultaneous detection and hybrid networking of optical fiber and wireless, and is not suitable for simultaneously covering detection points which are inconvenient for optical fiber wiring, such as pipes and terminals, and detection points which do not have communication signals in tunnels.
Disclosure of Invention
Problem to prior art exists, the utility model provides a detecting system is put in distributing type office puts sense passage and three synchronous sense passage through three office, can realize single-phase detection and three-phase while measuring to possess the multiple mode of optical fiber network deployment, wireless network deployment and the wireless integrated network deployment of optic fibre.
The utility model discloses a realize through following technical scheme:
distributed partial discharge detection system, including server and many distributed partial discharge detection unit, each distributed partial discharge detection unit includes: the server is connected with the comprehensive communication unit, the comprehensive communication unit is connected with the distributed signal acquisition unit, and the distributed signal acquisition unit is respectively connected with the partial discharge acquisition sensor and the power frequency sensor through a BNC connector; the partial discharge acquisition sensor and the power frequency sensor are arranged on the cable body; the power supply unit supplies power for the comprehensive communication unit and the distributed signal acquisition unit.
In the technical scheme, a partial discharge acquisition sensor and a power frequency sensor acquire partial discharge signals and power frequency signals and send the signals to a distributed signal acquisition unit, the distributed signal acquisition unit transmits the partial discharge signals and the power frequency signals to a server through a comprehensive communication unit, and a partial discharge analysis database is embedded in the server to perform preliminary analysis and processing on real-time data; the data analysis system collects real-time detection data of each distributed partial discharge detection unit, and can display synchronous detection discharge spectrograms, oscillograms, frequency spectrums and discharge trend graphs of each distributed signal acquisition unit to comprehensively analyze and diagnose the running state and the partial discharge development trend of the cable.
As a further technical solution, the distributed signal acquisition unit includes two signal acquisition chips, and each signal acquisition chip includes two signal acquisition channels.
As a further technical solution, one of the four signal acquisition channels of the distributed signal acquisition unit is designed as follows: the distributed signal acquisition unit forms six signal acquisition channels for acquiring partial discharge signals and power frequency signals.
As a further technical scheme, the distributed signal acquisition unit comprises three partial discharge signal acquisition channels and three power frequency signal acquisition channels. The distributed signal acquisition unit is provided with three partial discharge detection channels and three synchronous detection channels, and can realize single-phase detection and three-phase simultaneous detection.
As a further technical solution, the integrated communication unit includes a DTU module and an optical fiber transceiver module; the DTU module is provided with two interfaces, the optical fiber transceiver module is provided with two interfaces, and the DTU module is not communicated with the optical fiber transceiver module.
As a further technical scheme, the integrated communication unit has three working modes of optical fiber networking, wireless networking and optical fiber wireless integrated networking. On the basis of normal work of a single distributed signal acquisition unit, a communication line is designed to connect a plurality of distributed signal acquisition units, a comprehensive communication mode of optical fiber communication, wireless communication and optical fiber wireless is adopted, a data communication network with low time delay and high speed is flexibly selected according to actual conditions of a detection field, the time delay of the communication network is counteracted in a self-adaptive mode, a server is adopted to unify accurate time service and automatic calibration of all devices, synchronous detection of multiple devices on the same line is achieved in an effective installation range, wired and wireless communication mixed use can be achieved, and each distributed signal acquisition unit can be used as a wireless relay or a wired terminal.
As a further technical scheme, the power supply unit is a portable power supply unit, and is configured to provide continuous working power supply for not less than 20 hours for a single distributed partial discharge detection unit.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) in the utility model, the partial discharge acquisition sensor and the power frequency sensor acquire partial discharge signals and power frequency signals and send the signals to the distributed signal acquisition unit, the distributed signal acquisition unit transmits the partial discharge signals and the power frequency signals to the server through the comprehensive communication unit, and the server is embedded with a partial discharge analysis database for preliminary analysis and processing of real-time data; the data analysis system collects real-time detection data of each distributed partial discharge detection unit, and can display synchronous detection discharge spectrograms, oscillograms, frequency spectrums and discharge trend graphs of each distributed signal acquisition unit to comprehensively analyze and diagnose the running state and the partial discharge development trend of the cable.
(2) The distributed partial discharge acquisition unit of the utility model has 3 partial discharge detection channels and 3 synchronous detection channels, and can realize single-phase detection and three-phase simultaneous detection; the integrated communication unit comprises an optical fiber communication module and a wireless communication module, and has working modes of optical fiber networking, wireless networking and optical fiber wireless integrated networking; the portable power supply unit provides power for continuous work of the single distributed partial discharge detection unit for not less than 20 hours.
(3) The utility model develops 250MS/s three-channel synchronous acquisition technology on the basis of the existing 100MS/s single-channel acquisition technology, the front end improves the precision of an ADC chip, data analysis adopts FPGA (field programmable gate array) for parallel processing, the multichannel synchronization performance is improved, the multichannel high-speed acquisition requirement is met, and the functions of single-channel independent work, switching of each working channel and three-channel synchronous acquisition are realized; each data acquisition channel is provided with an independent communication signal acquisition channel so as to acquire an accurate synchronous phase.
Drawings
Fig. 1 is a circuit diagram of a multiplexing circuit involved in one of the signal acquisition channels of a distributed signal acquisition unit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a down-conversion acquisition circuit according to an embodiment of the present invention, wherein one of the signal acquisition channels of the distributed signal acquisition unit is involved;
fig. 3 is a signal conditioning circuit diagram related to one of the signal acquisition channels of the distributed signal acquisition unit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a connection of optical fiber communication according to an embodiment of the present invention;
fig. 5 is a schematic connection diagram illustrating a GPRS/4G communication system according to an embodiment of the present invention, in which an integrated communication unit is disposed at a position far from an acquisition host;
FIG. 6 is a schematic connection diagram of a general case in a GPRS/4G communication mode according to an embodiment of the present invention;
fig. 7 is a schematic diagram of connection between an optical fiber and GPRS/4G hybrid communication according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The utility model provides a detecting system is put in distributing type office, put collection sensor and power frequency sensor including server, distributed signal acquisition unit, comprehensive communication unit, portable power source, office.
The sampling rate of each channel of the distributed signal acquisition unit is 125MS/s, 3 partial discharge signal acquisition channels and 3 power frequency signal acquisition channels are provided, three-phase detection data and power frequency signals can be synchronously received (if a pressurization test is carried out phase by phase during a pressure test, only single-phase partial discharge data can be set to be detected), and a partial discharge analysis database is embedded in the server to carry out real-time data primary analysis and processing. The data analysis system collects real-time detection data of all the distributed detection hosts and can display synchronous detection discharge spectrograms, oscillograms, frequency spectrums and discharge trend graphs of all the distributed signal acquisition units to comprehensively analyze and diagnose the running state and the partial discharge development trend of the cable.
The partial discharge acquisition sensor and the power frequency sensor are connected to the distributed signal acquisition unit through the BNC connector and are installed on the cable body.
The comprehensive communication unit transmits the signals acquired by the distributed signal acquisition unit to the server.
The portable power supply supplies power to the distributed signal acquisition unit and the comprehensive communication unit.
The integrated communication unit comprises a DTU module and an optical fiber transceiver module, the communication modes of the distributed signal acquisition unit and the server comprise optical fiber communication, GPRS/4G communication and optical fiber and GPRS/4G integrated communication, and the communication mode can be selected independently according to the actual situation of a test field.
A conventional distributed signal acquisition unit includes two signal acquisition chips, each of which includes two signal acquisition channels. The utility model discloses it is right one of them signal acquisition passageway of four signal acquisition passageways of distributed signal acquisition unit improves, designs it as: the frequency reduction acquisition circuit comprises a multiplexing circuit shown in an attached figure 1, a frequency reduction acquisition circuit shown in an attached figure 2 and a signal conditioning circuit shown in an attached figure 3, so that six signal acquisition channels formed by the distributed signal acquisition unit are used for acquiring partial discharge signals and power frequency signals, and single-phase detection and three-phase simultaneous detection can be realized through three partial discharge detection channels and three synchronous detection channels.
Example 1
This embodiment provides a distributed office puts detecting system, includes server and 3 distributed office puts detecting element, and each distributed office puts detecting element includes: the server is connected with the comprehensive communication unit, the comprehensive communication unit is connected with the distributed signal acquisition unit, and the distributed signal acquisition unit is respectively connected with the partial discharge acquisition sensor and the power frequency sensor through a BNC connector; the partial discharge acquisition sensor and the power frequency sensor are arranged on the cable body; the power supply unit supplies power for the comprehensive communication unit and the distributed signal acquisition unit.
As shown in fig. 4, in the present embodiment, an optical fiber communication method is adopted, and a communication optical fiber is arranged segment by segment in the tunnel to connect the distributed hosts, and a serial connection method is adopted.
1) The network cable interface of the distributed signal acquisition unit is connected with a right network cable interface LAN A (both LAN A and LAN B) corresponding to the optical fiber transceiver in the comprehensive communication module;
2) the Fx1 port of the distributed signal acquisition unit a and the Fx2 port of the acquisition host B are connected by an optical fiber, and the Fx2 port of the distributed signal acquisition unit B and the Fx1 port of the distributed signal acquisition unit C are connected by an optical fiber (note: the same fiber can not be connected to Fx1 port or Fx2 port at both ends);
3) and a right network cable interface LAN B corresponding to the optical fiber transceiver in the comprehensive communication module of the head-end or tail-end distributed signal acquisition unit is connected to a server network cable interface to form a communication channel.
Example 2
Different from embodiment 1, in this embodiment, a GPRS/4G communication mode is adopted, and as shown in fig. 5 and 6, a GPRS/4G antenna is connected to each distributed signal acquisition unit, and the antenna is led out to a position with a better signal. For locations inside the tunnel that are far from the tunnel wellhead, the device supports the placement of the integrated communication unit at a remote location from the distributed signal acquisition unit to enhance the signal.
Fig. 6 shows a conventional wiring method:
1) each distributed signal acquisition unit network cable interface is connected with a left network cable interface LAN A (both LAN A and LAN B) corresponding to the DTU in the integrated communication module;
2) and a left network cable interface LAN B corresponding to the DTU in a comprehensive communication module of the head-end or tail-end distributed signal acquisition unit is connected to a server network cable interface to form a communication channel.
Fig. 5 shows the connection mode when the integrated communication unit is placed at a position far from the acquisition host:
1) placing the comprehensive communication unit at a position with a stronger signal, connecting a network cable interface of the distributed signal acquisition unit with a left network cable interface LAN A (both LAN A and LAN B) corresponding to a DTU (digital television unit) in the comprehensive communication unit by using a special network cable (30 meters), and using a special power cable (30 meters) as a power cable;
2) and a left network cable interface LAN B corresponding to the DTU in the comprehensive communication unit of the head-end or tail-end distributed signal acquisition unit is connected to a server network cable interface to form a communication channel.
Example 3
Different from the embodiments 1 and 2, the embodiment adopts a fiber and GPRS/4G mixed communication mode, as shown in fig. 7, GPRS/4G communication is used at a detection point where fiber wiring is inconvenient, such as a pipe arrangement, a terminal and the like, fiber communication is used at a detection point where no communication signal exists in a tunnel, and the server system is connected with the fiber transceiver and the GPRS/4G receiving module at the same time to start an integrated communication mode.
The distributed signal acquisition unit A adopts a GPRS/4G communication mode, the distributed signal acquisition unit B and the distributed signal acquisition unit C adopt an optical fiber communication mode, and the wiring mode is as follows:
1) the antenna interface of the distributed signal acquisition unit A is connected with an antenna, and if the signal of the position where the acquisition host is placed is weak, a magnetic type antenna is suggested to be used and placed at the position where the signal is relatively strong;
2) the network cable interface of the distributed signal acquisition unit B is connected with a right network cable interface LAN A (both LAN A and LAN B) corresponding to the optical fiber transceiver in the integrated communication unit;
3) the network cable interface of the distributed signal acquisition unit C is connected with a right network cable interface LAN A (both LAN A and LAN B) corresponding to the optical fiber transceiver in the integrated communication unit;
4) connecting an Fx1 port of the distributed signal acquisition unit B with an Fx2 port of the distributed signal acquisition unit C by using an optical fiber;
5) connecting a left network cable interface LAN A interface and a right network cable interface LAN B interface of the distributed signal acquisition unit C by using a network cable;
6) the left network cable interface LAN B of the distributed signal acquisition unit C is connected to the server network cable interface to form a communication channel.
In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the essence of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. Distributed partial discharge detection system, including server and many distributed partial discharge detection unit, its characterized in that, each distributed partial discharge detection unit includes: the server is connected with the comprehensive communication unit, the comprehensive communication unit is connected with the distributed signal acquisition unit, and the distributed signal acquisition unit is respectively connected with the partial discharge acquisition sensor and the power frequency sensor through a BNC connector; the partial discharge acquisition sensor and the power frequency sensor are arranged on the cable body; the power supply unit supplies power for the comprehensive communication unit and the distributed signal acquisition unit.
2. The distributed partial discharge detection system according to claim 1, wherein the distributed signal acquisition unit comprises two signal acquisition chips, each signal acquisition chip comprising two signal acquisition channels.
3. The distributed partial discharge detection system according to claim 2, wherein one of the four signal acquisition channels of the distributed signal acquisition unit is designed to be: the distributed signal acquisition unit forms six signal acquisition channels for acquiring partial discharge signals and power frequency signals.
4. The distributed partial discharge detection system according to claim 3, wherein the distributed signal acquisition unit comprises three partial discharge signal acquisition channels and three power frequency signal acquisition channels.
5. The distributed partial discharge detection system according to claim 1, wherein the integrated communication unit comprises a DTU module and a fiber optic transceiver module; the DTU module is provided with two interfaces, the optical fiber transceiver module is provided with two interfaces, and the DTU module is not communicated with the optical fiber transceiver module.
6. The distributed partial discharge detection system according to claim 5, wherein the integrated communication unit has three operation modes of optical fiber networking, wireless networking and optical fiber wireless integrated networking.
7. The distributed partial discharge detection system according to claim 1, wherein the power supply unit is a portable power supply unit configured to provide a continuous working power supply for no less than 20 hours for a single distributed partial discharge detection unit.
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| CN202022609732.4U CN213903711U (en) | 2020-11-12 | 2020-11-12 | Distributed partial discharge detection system |
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| CN202022609732.4U CN213903711U (en) | 2020-11-12 | 2020-11-12 | Distributed partial discharge detection system |
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| CN213903711U true CN213903711U (en) | 2021-08-06 |
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