CN202676308U - Device for monitoring temperature of isolated contact of high-voltage switch cabinet on line - Google Patents

Abstract

The utility model discloses an on-line monitoring device for the temperature of an isolation contact of a high-voltage switch cabinet, which solves the problems of high manufacturing cost and inaccurate testing of the existing equipment. A temperature sensor (2) is installed on the isolation contact (1) of the switch cabinet, and the temperature sensor (2) is electrically connected to the temperature signal acquisition terminal of the microprocessor (3), and the power supply of the fast saturated current transformer (6) is connected to the microprocessor connected to the power input terminal of the device (3), the on-site wireless signal transceiver (4) is connected to the I/O of the microprocessor (3), and an industrial computer (8) and a central wireless signal transceiver (7) are set in the central control room ), the central wireless signal transceiver (7) is connected with the on-site wireless signal transceiver (4) in the high-voltage switchgear (5) through radio signal communication, and the central wireless signal transceiver (7) is connected with the industrial computer (8). The utility model realizes continuous monitoring, historical storage, temperature rise trend analysis and abnormal temperature rise pre-alarm for the temperature of the isolation contact of the high-voltage switch cabinet.

Description

High-voltage switchgear isolation contact temperature on-line monitoring device

technical field

The utility model relates to an on-line temperature monitoring device, in particular to an on-line monitoring device for the temperature of an isolation contact of a high-voltage switch cabinet.

Background technique

With the continuous improvement of the grid voltage level, the requirements for power supply reliability of electrical equipment are also getting higher and higher. High-voltage switchgear operates under high-voltage and high-current conditions, and its working reliability is closely related to the temperature rise of the contacts. In recent years, there have been many accidents in substations where the contacts of the switchgear were overheated and the isolation contacts were burned. On the one hand, these accidents come from the quality problems of the switchgear itself, and the more important reason is the lack of effective monitoring methods for the temperature rise of the switchgear isolation contacts. At present, in domestic substations, off-line temperature measurement methods such as infrared thermometers are mostly used to measure the temperature of the isolation contacts of high-voltage switchgear, which has problems such as high cost, heavy workload, and inaccurate testing.

Contents of the invention

The utility model provides an on-line monitoring device for the temperature of an isolation contact of a high-voltage switchgear, which solves the problems of high cost and inaccurate testing existing in the existing equipment.

The utility model solves the above problems through the following solutions:

An on-line monitoring device for the temperature of a high-voltage switch cabinet isolation contact, including a high-voltage end microprocessor, a wireless signal transceiver, a power supply for a fast saturated current transformer, and a contact temperature sensor set on the switch cabinet isolation contact. The processor is connected with the AD sampling circuit through the temperature signal conditioning circuit, the power supply of the fast saturated current transformer is connected with the power input terminal of the microprocessor, and the DC power supply is provided for the high-voltage end signal processing chip and the wireless signal transceiver through the voltage conversion module. The wireless signal transceiver is connected to the I/O port of the microprocessor, and the central control room is equipped with an industrial computer, a central wireless signal transceiver, a keyboard and a display unit, an audible and visual alarm and a data communication unit, and the central wireless signal transceiver and the high-voltage The on-site wireless signal transceiver in the switch cabinet is connected through radio signal communication, and the central wireless signal transceiver is connected with the industrial computer.

The six isolation contacts of the three-phase main circuit in the high-voltage switchgear are equipped with a microprocessor, a field wireless signal transceiver, a fast saturated current transformer power supply and a temperature sensor.

The utility model continuously monitors the temperature of the isolation contact of the high-voltage switchgear through the on-line monitoring technology of the electric power equipment, stores the history, audibly and visually alarms and communicates data, etc., and solves the problem of untimely data collection and inaccurate judgment standards caused by relying on manual inspection. , There is no early warning of abnormal temperature rise of the isolation contact, no analysis of temperature trend changes, and a series of problems such as not suitable for automated operations. By adopting the induction power supply mode, the microprocessor and the temperature sensor have the same potential, which greatly reduces the interference and influence of the high-voltage magnetic field on the monitoring system.

Description of drawings

Fig. 1 is a structural representation of the utility model.

specific embodiment

An on-line monitoring device for the temperature of a high-voltage switchgear isolation contact, including a microprocessor 3 set in a high-voltage switchgear 5, a field wireless signal transceiver 4, and a power supply 6 for a fast saturated current transformer, which is set on the switchgear isolation contact 1 There is a temperature sensor 2, the temperature sensor 2 is connected with the temperature signal acquisition end of the microprocessor 3, the fast saturation current transformer power supply 6 is connected with the power input end of the microprocessor 3, the on-site wireless signal transceiver 4 is connected with the microprocessor 3 The I/O port is connected. The central control room is provided with an industrial computer 8 and a central wireless signal transceiver 7. The central wireless signal transceiver 7 is connected with the on-site wireless signal transceiver 4 in the high-voltage switch cabinet 5 through radio signal communication. The central wireless signal The signal transceiver 7 is electrically connected with the industrial computer 8 .

The six isolation contacts of the three-phase main circuit in the high-voltage switchgear 5 are all provided with a microprocessor, a field wireless signal transceiver, a power supply of a fast saturated current transformer and a temperature sensor.

The utility model is composed of two major parts. The first part is the high-voltage end at high potential, that is, the high-voltage electrical cabinet, including a temperature measurement sensor unit, a temperature data acquisition unit, a microprocessor unit, a power supply module unit, and a radio data transmission unit. , the so-called high-voltage end means that all power supplies in this part use the phase voltage of the corresponding isolation contact as the reference ground; the other part is the low-voltage end at low potential, that is, in the central control room, including industrial computers, wireless signal transceivers, keyboards With the display unit, sound and light alarm and data communication unit, the so-called low-voltage side means that all power supplies in this part use the earth as the reference ground.

The utility model adopts the principle of contact temperature measurement, and obtains the temperature value of the high-voltage isolation contact through high-precision Pt100. Conduct trend analysis on the historical data of contact temperature to realize the pre-alarm function of abnormal temperature. This not only solves the problem of inaccurate temperature measurement by infrared probes commonly used in China, but also solves the problem of high-voltage isolation and realizes the centralized processing of temperature data; The measurement error caused by the different potentials of the processor and the sensor; the power supply required by the high-voltage side microprocessor and the sensor element is powered by induction.

A database for storing temperature data is developed in the industrial computer. Before installation, each switch cabinet in the high-voltage room is numbered, and each isolation contact of each switch cabinet is numbered. The high-voltage end module of each switch cabinet is every 1 second. After completing a data measurement of the contacts, the low-voltage end industrial computer uses roll call to call the temperature measurement unit of the switch cabinet isolation contact for data transmission, and realizes the abnormal alarm of the received data temperature and the analysis of the temperature data trend. Through the use of wireless communication, it replaces the on-site The communication bus saves communication cables and equipment, facilitates the debugging and installation of the device, realizes the network communication between the industrial computer and the detection units of each switch cabinet, and meets the requirements for centralized and intelligent monitoring of the contact temperature; the central control room The industrial computer can save the collected historical temperature data for one year. The early warning parameter setting and actual temperature display can be realized through the keyboard and display unit. The abnormal temperature pre-alarm function of the isolated contact can be realized through the analysis of the historical data. The central control room data communication The unit supports the grid-connected integrated connection between the monitoring system and other monitoring networks, which facilitates the centralized processing, analysis and sharing of data, enhances the compatibility between the monitoring system and other protection systems of the substation, and improves the expansion capability of the system.

Claims (2)

1. high-tension switch cabinet insulating contact temperature on-line monitoring device, it is characterized in that: in high-tension switch cabinet (5), be provided with microprocessor (3), on-site wireless signal transceiver (4) and quick-magnetic saturated current transformer power supply (6), insulating contact (1) at switch cubicle is provided with temperature sensor (2), temperature sensor (2) is connected with the signals collecting end of microprocessor (3), quick-magnetic saturated current transformer power supply (6) is connected with the power input of microprocessor (3), on-site wireless signal transceiver (4) is connected with the I/O mouth of microprocessor (3), be provided with industrial computer (8) and wireless centrex signal transceiver (7) at central control room, wireless centrex signal transceiver (7) is connected by the radio signal communication with on-site wireless signal transceiver (4) in the high-tension switch cabinet (5), and wireless centrex signal transceiver (7) links together with industrial computer (8).

2. a kind of high-tension switch cabinet insulating contact temperature on-line monitoring device according to claim 1, it is characterized in that: six insulating contacts of three-phase major loop are provided with microprocessor, on-site wireless signal transceiver, quick-magnetic saturated current transformer power supply and temperature sensor in high-tension switch cabinet (5).

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