Switch cabinet safe operation monitoring device

Abstract

The utility model discloses a switch cabinet safe operation monitoring device which comprises a partial discharge monitoring device, a high-voltage live-line sensor and a wireless temperature sensor, a high-voltage live-line loop is in wired connection with the high-voltage live-line sensor, the high-voltage live-line sensor is in wired connection with the partial discharge monitoring device, and the wireless temperature sensor is in wired connection with the partial discharge monitoring device. The temperature sensor is in wireless connection with the partial discharge monitoring device, collected data can be read and stored on site and uploaded to a control background through an RS485 interface in a Modbus communication mode, the functions of real-time detection, query, statistics and the like are provided, field debugging and calibration can be carried out through a USB interface, and the real-time monitoring of the partial discharge monitoring device is realized. The partial discharge live inspection and atlas analysis device has the characteristics of modular design, simple design and production process, interference resistance, photoelectric and electromagnetic isolation, convenience in installation, long service life, excellent environmental endurance capability and electromagnetic compatibility, and long-term safe and reliable operation.

Description

Technical Field

[0001] The utility model belongs to the technical field of partial discharge online monitoring systems for switch cabinets, in particular to a switch cabinet safe operation monitoring device for a 10kV / 35kV medium and high voltage system. Background Art

[0002] With the rapid development of smart grid construction in my country, the grid structure of modern power grids is becoming increasingly complex, especially the distribution network, which has many equipment, wide distribution area, complex environment, high failure rate and other problems. Daily maintenance faces difficulties such as large number, heavy tasks and insufficient manpower. This brings severe challenges to the daily operation and maintenance of electrical equipment and the safe operation of the power grid. Failure of distribution network equipment will not only directly cause power supply interruption of the power supply system and reduce the economic benefits of power grid enterprises, but may also cause significant production losses to power users. Therefore, it is urgent to be able to implement planned operation and maintenance and power outage maintenance of electrical equipment, extend the maintenance interval of electrical equipment as much as possible, shorten the maintenance time, reduce the maintenance cost, thereby shortening the power outage time, reducing the social impact caused by power outage maintenance, and increasing economic benefits.

[0003] According to statistics, up to 80% of the faults in the power supply and distribution system are caused by faults in distribution network equipment such as switch cabinets and ring main units. Therefore, improving power supply reliability requires strengthening the daily operation and maintenance management of distribution network equipment and improving the efficiency of operation and maintenance. How to effectively carry out online monitoring and live detection of switch cabinets and ring main units is becoming a topic of widespread concern and urgent need to be solved by the equipment management departments of power supply and power supply enterprises.

[0004] At present, the equipment management departments of power supply and distribution enterprises have gradually formed an operation and maintenance system represented by live detection technologies for detecting partial discharge currents, such as transient ground voltage, ultrasound, ultra-high frequency, and infrared imaging, which has made outstanding contributions to improving power supply reliability. However, these partial discharge detection methods are all based on the detection of partial discharge associated phenomena, which is the so-called indirect measurement method. The indirect measurement method itself has inherent deficiencies. In response to this situation, we have developed an economical, reliable and practical partial discharge online monitoring product based on the direct measurement method based on our many years of experience in distribution network equipment operation and maintenance technology research and services. It perfectly solves the various problems existing in the indirect measurement method. Utility Model Content

[0005] The purpose of the utility model is to improve the deficiencies of the existing technology and provide a switch cabinet safety operation monitoring device which adopts modular design, has a simple design and production process, is anti-interference, has photoelectric and electromagnetic isolation, is easy to install, has a long service life, has excellent environmental tolerance and electromagnetic compatibility, and can operate safely and reliably for a long time.

[0006] The purpose of the utility model is achieved in this way. A switch cabinet safe operation monitoring device includes a switch cabinet, which is characterized by also including a partial discharge monitoring device, a high-voltage live sensor and a wireless temperature sensing device, wherein:

[0007] The wireless temperature sensor device is installed on the high-voltage live circuit of the switch cabinet to measure the temperature of the surface or contact of the high-voltage live object, and sends the collected temperature signal to the partial discharge monitoring device via a wireless signal;

[0008] The high-voltage live sensor is installed on the high-voltage live circuit of the switch cabinet, and adopts a pressure-drawing capacitor core rod to detect the live state of the high-voltage live circuit, perform coupling extraction of partial discharge signals, and transmit the extracted signals to the partial discharge monitoring device;

[0009] The partial discharge monitoring device is used to receive signals transmitted by a wireless temperature sensor and a high-voltage live sensor, and to calculate and process partial discharge signals, display the partial discharge amount on-site, provide a multi-color LED indicator light warning of the severity of partial discharge, display high-voltage live, force lockout, store detection data on-site and transmit via RS485, and can also perform on-site debugging and calibration via a USB interface.

[0010] In order to further achieve the purpose of the utility model, the wireless temperature sensing device may include a temperature sensor, a signal processing amplifier, a logic control loop, and a wireless modulation interface. The temperature sensor is used to measure the temperature on the surface or at the contact of a high-voltage charged object, and transmits the collected temperature signal to the signal processing amplifier. The signal amplifier amplifies the temperature signal from the temperature sensor and transmits it to the logic control loop. The logic control loop processes the amplified temperature signal and transmits it through the wireless modulation interface.

[0011] Compared with the existing technology, the utility model has the following significant features and positive effects: the utility model adopts a modular design, integrating insulation monitoring, temperature monitoring, and power frequency live display functions, and can continuously and real-time online monitor equipment insulation and temperature rise abnormalities, and comprehensively diagnose the operating status of electrical equipment. The multi-source status monitoring results such as probability intensity, average intensity, discharge frequency, temperature value, and live state are displayed on-site, and equipment abnormality alarms are issued through multi-color LED warning lights and relay alarm contacts. At the same time, remote monitoring is carried out through the RS485 interface. It can be equipped with a cloud platform to realize comprehensive analysis and diagnosis of big data to make the results more accurate. The design and production process is simple, anti-interference, photoelectric electromagnetic isolation, easy installation, long service life, excellent environmental tolerance and electromagnetic compatibility, and can operate safely and reliably for a long time. The utility model realizes partial discharge monitoring for safe operation of switch cabinets, can measure charge migration, and has high sensitivity. As long as there is a discharge phenomenon, it can be detected, and it has strong applicability. As long as there is an electrical connection, it can be monitored, and the spatial range is wide. The high-voltage live state and partial discharge state are uploaded to facilitate operation and maintenance, reduce production management costs, have a low failure rate, and a long service life, which can ensure safe use and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 It is an electrical principle block diagram of the utility model. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0015] A switch cabinet safe operation monitoring device, referring to Figure 1 , Figure 2 , including a conventional switch cabinet, a wireless temperature sensor device 1, a high-voltage live sensor 3 and a partial discharge monitoring device 4, wherein:

[0016] The wireless temperature sensing device 1 is connected to the surface or contact of the high-voltage live circuit 2 of the switch cabinet by bundling, and the collected temperature signal is sent to the partial discharge monitoring device 4 by wireless signal. It adopts bundling installation and inductive power supply, and the transmission distance can reach up to 150 meters. The wireless temperature sensing device 1 includes a temperature sensor, a signal processing amplifier, a logic control circuit, and a wireless modulation interface. The temperature sensor is used to measure the temperature of the surface or contact of the high-voltage live object, and the collected temperature signal is transmitted to the signal processing amplifier. The signal amplifier amplifies the temperature signal from the temperature sensor and transmits it to the logic control circuit. The logic control circuit processes the amplified temperature signal and transmits it to the partial discharge monitoring device 4 through the wireless modulation interface.

[0017] The high-voltage live sensor 3 is installed on the high-voltage live circuit of the switch cabinet, and adopts a pressure-drawing capacitor core rod to connect the high-voltage live circuit 2 of the switch cabinet and the partial discharge monitoring device 4 through wires to perform coupling extraction of partial discharge signals, and transmit the extracted signals to the partial discharge monitoring device 4 to provide partial discharge signals for the partial discharge monitoring device 4;

[0018] The partial discharge monitoring device 4 is used to receive signals transmitted by the wireless temperature sensor device 1 and the high-voltage live sensor 3, analyze, process and display the temperature and discharge signals, display the local discharge amount, the multi-color LED indicator alarm of the severity of the partial discharge, the high-voltage live display, the forced locking, the local storage of the detection data and RS485 transmission, and can be debugged and calibrated on site through the USB interface, and uploaded to the control platform 5 through the communication method, and connected to the external PC detection software to perform live inspection and spectrum analysis of partial discharge, such as the distribution equipment status monitoring and control platform developed by our company, which implements online analysis and evaluation of the insulation status of the distribution equipment.

[0019] This utility model is fully functional, integrating insulation monitoring, temperature monitoring, and power frequency live display. It can continuously and real-time monitor equipment insulation and temperature rise abnormalities online, and comprehensively diagnose the operating status of electrical equipment; it adopts partial discharge monitoring technology based on pulse current, which has high sensitivity and can quantitatively detect discharge, and implement the international standard IEC60270 for partial discharge detection; and it can display the multi-source status monitoring results such as probability intensity, average intensity, discharge frequency, temperature value, live state, etc. on-site, and issue equipment abnormality alarms through multi-color LED warning lights and relay alarm contacts; at the same time, it can remotely monitor through the RS485 interface, and can be equipped with a cloud platform to realize comprehensive analysis and diagnosis of big data, making the results more accurate. Its design and production process is simple, anti-interference, photoelectric electromagnetic isolation, easy installation, long service life, excellent environmental tolerance and electromagnetic compatibility, and can operate safely and reliably for a long time.

Claims

1. A switch cabinet safe operation monitoring device, comprising a switch cabinet, characterized in that It also includes a partial discharge monitoring device, a high voltage live sensor and a wireless temperature sensing device, wherein: The wireless temperature sensor device is installed on the high-voltage live circuit of the switch cabinet to measure the temperature of the surface or contact of the high-voltage live object, and sends the collected temperature signal to the partial discharge monitoring device via a wireless signal; The high-voltage live sensor is installed on the high-voltage live circuit of the switch cabinet, and adopts a pressure-drawing capacitor core rod to detect the live state of the high-voltage live circuit, perform coupling extraction of partial discharge signals, and transmit the extracted signals to the partial discharge monitoring device; The partial discharge monitoring device is used to receive signals transmitted by a wireless temperature sensor and a high-voltage live sensor, and to calculate and process partial discharge signals, display the partial discharge amount on-site, provide a multi-color LED indicator light warning of the severity of partial discharge, display high-voltage live, force lockout, store detection data on-site and transmit via RS485, and can also perform on-site debugging and calibration via a USB interface.

2. A switch cabinet safe operation monitoring device according to claim 1, characterized in that The wireless temperature sensing device includes a temperature sensor, a signal processing amplifier, a logic control loop, and a wireless modulation interface. The temperature sensor is used to measure the temperature on the surface or at the contact of a high-voltage charged object, and transmits the collected temperature signal to the signal processing amplifier. The signal amplifier amplifies the temperature signal from the temperature sensor and transmits it to the logic control loop. The logic control loop processes the amplified temperature signal and transmits it through the wireless modulation interface.

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