CN216622498U - XLPE cable sheath current on-line monitoring system - Google Patents
XLPE cable sheath current on-line monitoring system Download PDFInfo
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- CN216622498U CN216622498U CN202123325914.XU CN202123325914U CN216622498U CN 216622498 U CN216622498 U CN 216622498U CN 202123325914 U CN202123325914 U CN 202123325914U CN 216622498 U CN216622498 U CN 216622498U
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Abstract
The utility model discloses an XLPE cable sheath current online monitoring system, which comprises a current sensor and an online monitoring device, wherein the current sensor is arranged on a grounding wire of a cross interconnection box of a tested cable and is used for monitoring sheath current of the tested cable, the online monitoring device comprises a current acquisition module, a communication module, a power supply module and an MCU main control module, the power supply module supplies power for the current acquisition module, the communication module and the MCU main control module, the current acquisition module is connected between the current sensor and the MCU main control module, the current acquisition module acquires 4 paths of sheath current signals, including an A phase, a B phase, a C phase and a path of total current signal, data are preprocessed and then uploaded to the MCU main control module, and the MCU main control module is connected with a monitoring platform through the communication module. The utility model can detect the current signal of the cable sheath in real time, and then takes the current signal as a characteristic signal to carry out signal characteristic extraction and fault identification.
Description
Technical Field
The utility model relates to an online monitoring system for a high-voltage cable, in particular to an online monitoring system for XLPE cable sheath current.
Background
Aiming at cross-linked polyethylene (XLPE) power cables with 66kV or above voltage level of a power grid system in China, insulation damage or line faults are easily caused due to factors such as production quality, external force damage, insulation aging and the like. At present, a method for periodic inspection and power failure preventive test is mainly used for detecting the state of an XLPE cable, belongs to off-line monitoring, and has the problems of inaccurate test model, introduction of test damage risk and the like. XLPE cables with higher voltage levels generally adopt a live detection mode, and detection results of the method accord with actual operation conditions of the cables, but the method has the problems of high operation and maintenance cost, incapability of continuous monitoring and the like. The existing on-line monitoring means of the cable comprises a plurality of monitoring methods such as optical fiber temperature measurement, sheath current, partial discharge and the like, compared with the existing on-line monitoring means, the sheath current on-line monitoring is a method which is simple to operate and has strong engineering applicability, can detect a cable sheath current signal in real time, and then uses the signal as a characteristic signal to carry out signal characteristic extraction and fault identification.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing an XLPE cable sheath current on-line monitoring system which can detect a cable sheath current signal in real time and then take the cable sheath current signal as a characteristic signal to carry out signal characteristic extraction and fault identification.
In order to solve the technical problem, the technical scheme adopted by the utility model is as follows: the utility model provides a XLPE cable sheath electric current on-line monitoring system, including current sensor and on-line monitoring device, current sensor installs on being surveyed cable cross interconnection box earth connection, a sheath electric current for monitoring being surveyed cable, on-line monitoring device includes current acquisition module, communication module, power module and MCU host system, power module is current acquisition module, communication module and MCU host system power supply, current acquisition module connects between current sensor and MCU host system, 4 way sheath current signal are gathered to current acquisition module, including A looks, B looks, C looks and total current signal all the way, upload to MCU host system after carrying out the preliminary treatment with data, MCU host system passes through communication module and links to each other with monitor platform.
Furthermore, the current acquisition module comprises a current acquisition circuit and an electric energy acquisition chip, the current acquisition circuit comprises a resistor R20, R21, R22, R122, a capacitor C35 and a capacitor C36, the resistor R21 is connected between the anode input end of the sheath current and the anode output end of the circuit, the resistor R22 is connected between the cathode input end of the sheath current and the cathode output end of the circuit, the resistor R122 is connected between the cathode input end of the sheath circuit and the ground, the resistor R20 is connected between the anode input end of the sheath current and the cathode input end of the sheath current, the capacitors C35 and C36 are connected in series between the anode output end and the cathode output end of the circuit, and the capacitor C35 and the capacitor C36 are grounded, the sheath current positive input end and the sheath current negative input end are connected with the output end of the current sensor, and the positive output end and the negative output end of the current acquisition circuit are connected with the input end of the electric energy acquisition chip.
Further, be equipped with POWER supply control circuit between MCU main control module and the electric energy collection chip, POWER supply control circuit includes triode V1, inductance L3, electric capacity C95 and resistance R37, MCU main control module's POWER _ CTRL end is connected to triode V1's base, triode V1's collecting electrode is connected to the 3.3V voltage source, triode V1's projecting pole is connected to the POWER supply pin of electric energy collection chip through inductance L3, inductance L3 connects the one end of electric energy collection chip POWER supply pin and passes through electric capacity C95 ground connection, electric capacity C95 is through resistance R37 ground connection again.
Further, the communication module comprises LC optical port communication, RJ-45 network port communication and RS485 serial port communication.
Further, RS485 serial port communication adopts the RS485 communication circuit from receiving and dispatching control, including isolating the chip, RS485 receives and dispatches chip and filtering protection circuit, the receiving and dispatching port of isolating the chip links to each other with MCU host system's receiving and dispatching port, the output of isolating the chip passes through resistance R43, triode Q4 is connected to the input of RS485 receives and dispatches chip, filtering protection circuit includes TVS device D30, TVS device D31 and common mode filter T4, common mode filter T4 connects the 485A of RS485 chip, behind the 485B pin, common mode filter T4 and TVS device D30, the RS485 that is connected monitor platform is drawn forth between D31 receives and dispatches interface J7.
Furthermore, a fiber ring network communication mode is adopted among the plurality of online monitoring devices, and data are uploaded to the master station system through the core switch.
Furthermore, the current sensor adopts an outdoor open-close type current transformer.
The utility model has the beneficial effects that: the utility model provides an XLPE cable sheath current on-line monitoring system which can realize real-time monitoring of the grounding current of a metal outer sheath of an XLPE high-voltage cable. The current acquisition module comprises a current acquisition circuit and an energy acquisition chip, has small nonlinear measurement error, adopts a synchronous sampling mode, and has the functions of harmonic analysis and temperature compensation. The power supply control circuit is arranged for carrying out periodic acquisition, so that the acquisition power consumption is saved, and the electromagnetic compatibility of the device is improved. The communication module comprises LC optical port communication, RJ-45 network port communication and RS485 communication, can realize high-speed network communication and meets the current sampling frequency requirement.
Drawings
FIG. 1 is a schematic block diagram of an online monitoring device;
FIG. 2 is a circuit schematic of a current acquisition circuit;
FIG. 3 is a circuit schematic of the power supply control circuit;
FIG. 4 is a circuit schematic of an RS485 communication circuit;
fig. 5 is a communication diagram of a plurality of on-line monitoring devices.
Detailed Description
The utility model is further described with reference to the following figures and specific embodiments.
Example 1
The embodiment discloses an XLPE cable sheath current online monitoring system, which consists of a current sensor and an online monitoring device. The current sensor is installed on the cable cross interconnection box earth connection to be measured, and current sensor and on-line monitoring device adopt high shielding coaxial cable to be connected, and on-line monitoring device can adopt net gape or light mouthful form to upload the monitoring result to upper system platform. The last time the system platform performed the analysis of the sheath current signal, but the analysis process is not within the scope of the present invention.
As shown in fig. 1, the online monitoring device includes a current collection module, a communication module, a power supply module and an MCU main control module, wherein the power supply module supplies power to the current collection module, the communication module and the MCU main control module, and can output multiple voltage signals such as DC5V/DC24V when rated to input AC 220V. The current acquisition module is connected between the current sensor and the MCU main control module, acquires 4 paths of sheath current signals including A phase, B phase, C phase and a path of total current signal, uploads the data to the MCU main control module after preprocessing, and the MCU main control module is connected with the monitoring platform through the communication module.
IN this embodiment, 4 sampling channels are used to collect a/B/C phase and one total current signal, which are IA +, IB +, IC +, IN +, for example, an IN + circuit (IA +, IB +, IC + and IN + circuit have the same structure), as shown IN fig. 2, the current collection module includes a current collection circuit and an electric energy collection chip, the current collection circuit includes a resistor R20, R21, R22, R122, a capacitor C35, and a capacitor C36, the resistor R21 is connected between the sheath current positive input terminal IN + and the positive output terminal VOP of the circuit, the resistor R22 is connected between the sheath current negative input terminal IN-and the negative output terminal VON of the circuit, the resistor R122 is connected between the sheath current negative input terminal IN-and the ground DGND, the resistor R20 is connected between the sheath current positive input terminal IN + and the sheath current negative input terminal IN-, the capacitors C35, and C36 are connected IN series between the positive output terminal VOP and the negative output terminal VON of the circuit, and the capacitor C35 and the capacitor C36 are grounded, the sheath current positive input end IN + and the sheath current negative input end IN-are connected with the output end of the current sensor, and the positive output end VOP and the negative output end VON of the current acquisition circuit are connected to the input end of the electric energy acquisition chip. The electric energy acquisition chip outputs a digital signal to the MCU main control chip after analog-to-digital conversion of the received current signal.
In this embodiment, the current sensor is an outdoor open-close type current transformer, and has a rated input current of 200A and a rated output current of 100 mA. The electric energy acquisition chip uses a 3.3V single power supply for power supply, the module has the functions of signal acquisition, filtering, analog-to-digital conversion and the like, and the nonlinear measurement error is less than 0.1%. And a synchronous sampling mode is adopted, and the harmonic analysis and temperature compensation functions are achieved.
And an SPI communication mode is adopted between the acquisition chip and the MCU. The POWER supply of the sampling module is controlled by a main chip POWER _ CTRL signal through a V1 triode, and the isolation of the main control module ground (DGND) and the sampling module ground (DGND _ 1) is carried out by using an inductor L3 and an electrolytic capacitor C95. Specifically, as shown in fig. 3, a POWER supply control circuit is arranged between the MCU main control module and the POWER acquisition chip, the POWER supply control circuit includes a transistor V1, an inductor L3, a capacitor C95 and a resistor R37, the POWER _ CTRL end of the MCU main control module is connected to the base of a transistor V1, the 3.3V voltage source is connected to the collector of a transistor V1, the emitter of the transistor V1 is connected to the POWER supply pin of the POWER acquisition chip through an inductor L3, the inductor L3 is connected to the ground through a capacitor C95 at the end where the POWER supply pin of the POWER acquisition chip is connected, and the capacitor C95 is grounded through a resistor R37.
In this embodiment, the communication module includes 2 LC optical ports, 4 RJ-45 ports and 2 RS485 communications. The system supports a TCP/IP protocol, has a communication rate of 10/100M, can realize high-speed network communication, and meets the requirement of current sampling frequency. As shown in fig. 4, the RS485 serial port communication adopts an RS485 communication circuit controlled by receiving and sending, including an isolation chip U18, an RS485 receiving and sending chip U13 and a filtering protection circuit, the receiving and sending port of the isolation chip U18 is connected with the receiving and sending port of the MCU main control module, the output end of the isolation chip U18 is connected to the input end of the RS485 receiving and sending chip U13 through a resistor R43 and a triode Q4, the filtering protection circuit includes a TVS device D30, a TVS device D31 and a common mode filter T4, the common mode filter T4 is connected behind pins 485A and 485B of the RS485 chip, and an RS485 receiving and sending interface J7 connected with the monitoring platform is led out between the common mode filter T4 and the TVS devices D30 and D31. RS485 serial port communication realizes circuit filtering protection through TVS device D30, D31 and common mode filter T4, disposes ADUM1201BR isolation chip simultaneously, realizes the isolation of master control circuit and external circuit, prevents the field interference. The system meets the IEC61850 communication protocol for data uploading, and the communication function of the device at the monitoring end of the transformer substation is realized. The model of the RS485 receiving and transmitting chip is MAX485 EESA.
In the embodiment, the main control chip adopts STM32 series controllers, an integrated timer, CAN, SPI, I2C, USB, USART and other functions; the real-time clock circuit adopts a DS1302 clock chip and adopts an SPI three-wire interface to carry out synchronous communication with the CPU, so that the functions of SOE fault recording, file saving and the like can be realized; the watchdog circuit monitors the program running state using the IMP706-T chip.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and modifications and substitutions by those skilled in the art are included in the scope of the present invention.
Claims (7)
1. The utility model provides a XLPE cable sheath electric current on-line monitoring system which characterized in that: including current sensor and on-line monitoring device, current sensor installs on being surveyed cable cross interconnection case earth connection, a sheath electric current for monitoring being surveyed the cable, on-line monitoring device includes current acquisition module, communication module, power module and MCU host system, power module is current acquisition module, communication module and MCU host system power supply, current acquisition module connects between current sensor and MCU host system, 4 way sheath current signal are gathered to current acquisition module, including A looks, B looks, C looks and total current signal all the way, upload to MCU host system after carrying out the preliminary treatment with data, MCU host system passes through communication module and links to each other with monitor platform.
2. The XLPE sheath current on-line monitoring system of claim 1, wherein: the current acquisition module includes current acquisition circuit and electric energy acquisition chip, current acquisition circuit includes resistance R20, R21, R22, R122 and electric capacity C35, C36, resistance R21 connects between the anodal output of sheath electric current positive input and this circuit, resistance R22 is connected between sheath electric current negative input and the negative output of this circuit, resistance R122 is connected between sheath circuit negative input and ground, resistance R20 is connected between sheath electric current positive input and sheath electric current negative input, electric capacity C35, C36 establishes ties between the anodal output and the negative output of this circuit, and ground connection between electric capacity C35 and electric capacity C36, the output of current sensor is connected to sheath electric current positive input and sheath electric current negative input, the anodal output and the negative output of current acquisition circuit are connected to the input of electric energy acquisition chip.
3. The XLPE sheath current on-line monitoring system of claim 2, wherein: be equipped with POWER supply control circuit between MCU host system and the electric energy acquisition chip, POWER supply control circuit includes triode V1, inductance L3, electric capacity C95 and resistance R37, MCU host system's POWER _ CTRL end is connected to triode V1's base, triode V1's collecting electrode is connected to the 3.3V voltage source, triode V1's projecting pole is connected to the POWER supply pin of electric energy acquisition chip through inductance L3, inductance L3 connects the one end of electric energy acquisition chip POWER supply pin and passes through electric capacity C95 ground connection, electric capacity C95 is again through resistance R37 ground connection.
4. The XLPE sheath current on-line monitoring system of claim 1, wherein: the communication module comprises LC optical port communication, RJ-45 network port communication and RS485 serial port communication.
5. The XLPE sheath current on-line monitoring system of claim 4, wherein: RS485 serial communication adopts RS485 communication circuit from receiving and dispatching control, including isolating the chip, RS485 receives and dispatches chip and filtering protection circuit, the receiving and dispatching port of isolating the chip links to each other with MCU host system's receiving and dispatching port, the output of isolating the chip passes through resistance R43, triode Q4 is connected to the input of RS485 receiving and dispatching chip, filtering protection circuit includes TVS device D30, TVS device D31 and common mode filter T4, common mode filter T4 connects the 485A of RS485 chip, behind the 485B pin, common mode filter T4 and TVS device D30, draw forth between D31 and connect monitoring platform's RS485 receiving and dispatching interface J7.
6. The XLPE sheath current on-line monitoring system of claim 1, wherein: and a fiber ring network communication mode is adopted among the plurality of online monitoring devices, and data are uploaded to the main station system through the core switch.
7. The XLPE sheath current on-line monitoring system of claim 1, wherein: the current sensor adopts an outdoor open-close type current transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123325914.XU CN216622498U (en) | 2021-12-28 | 2021-12-28 | XLPE cable sheath current on-line monitoring system |
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| CN202123325914.XU CN216622498U (en) | 2021-12-28 | 2021-12-28 | XLPE cable sheath current on-line monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114325231A (en) * | 2021-12-28 | 2022-04-12 | 山东电工电气集团有限公司 | XLPE cable sheath current on-line monitoring and fault diagnosis system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114325231A (en) * | 2021-12-28 | 2022-04-12 | 山东电工电气集团有限公司 | XLPE cable sheath current on-line monitoring and fault diagnosis system |
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Effective date of registration: 20220923 Address after: 16th Floor, Building 5, District 5, Hanyu Financial Business Center, High-tech Zone, Jinan City, Shandong Province, 250000 Patentee after: SHANDONG ELECTRICAL ENGINEERING & EQUIPMENT GROUP Co.,Ltd. Patentee after: Shandong Electric Group Digital Technology Co.,Ltd. Address before: 250101 No.16 Chonghua Road, high tech Development Zone, Jinan City, Shandong Province Patentee before: SHANDONG ELECTRICAL ENGINEERING & EQUIPMENT GROUP Co.,Ltd. |