A 500kv intelligent on-line monitoring intermediate joint

Abstract

The utility model relates to a kind of 500kV intelligent on-line monitoring intermediate joint.The joint includes 500kV cable intermediate joint and on-line monitoring device;The 500kV cable intermediate joint includes epoxy resin body and stress cone;The on-line monitoring device includes on-line partial discharge signal monitoring device, on-line temperature signal monitoring device and monitoring terminal.The utility model 500kV intelligent on-line monitoring intermediate joint, the application combination of intelligent on-line partial discharge and temperature monitoring system and 500kV intermediate joint, can early warning to the insulation defect possibly existing of cable and accessory product, find the insulation hidden danger of high-voltage cable and cable joint in advance;Solve the traditional line partial discharge and temperature signal " cannot measure" problem, guarantee cable safe operation.

Description

Technical Field

[0001] The utility model relates to a 500kV intelligent on-line monitoring intermediate joint, belonging to the technical field of high-voltage cross-linked power cable accessories. Background Technique

[0002] High-voltage and extra-high-voltage cross-linked cable systems have occupied a very important position in urban power grids. With the substantial increase in electricity consumption, the voltage levels of cables in major cities have also been continuously improved. With the increase in the number of high-voltage cable lines in operation and the operation time, the frequency of failures of cable accessory products has also increased accordingly. More than 80% of the cable system failures are joint accessory failures, including problems with the quality of the main body, installation defects, environmental impacts, etc.; especially when operating under heavy loads in extreme weather, local repeated heating will accelerate the aging of accessory products, resulting in a decline in insulation performance and ultimately breakdown. Therefore, the monitoring of the operating status of accessories - the intelligence of accessory products is the key to realizing the safe management of the power grid.

[0003] Compared with traditional cable accessories, intelligent cable accessories not only make the detection more timely and accurate, saving personnel costs, but can also be linked with multiple systems (such as the fire protection system) to ensure the safe and stable operation of the system. With the continuous advancement of China's intelligent manufacturing and the rapid development of the power industry, the domestic cable system has higher and higher requirements for intelligence, and intelligent cable accessory products have also become an inevitable trend of development. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the utility model provides a 500kV intelligent on-line monitoring intermediate joint, which can detect potential insulation hazards of high-voltage cables in advance by on-line monitoring partial discharge and temperature signals, and ensure the safe operation of the cables.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model provides a 500kV intelligent on-line monitoring intermediate joint, including a 500kV cable intermediate joint and an on-line monitoring device;

[0007] The 500kV cable intermediate joint includes an epoxy resin body and a stress cone;

[0008] The on-line monitoring device includes an on-line partial discharge signal monitoring device, an on-line temperature signal monitoring device and a monitoring terminal;

[0009] The on-line partial discharge monitoring device includes a partial discharge sensor, a partial discharge acquisition module and a partial discharge acquisition relay;

[0010] The on-line temperature monitoring device includes a temperature sensor, a temperature acquisition module and a temperature acquisition relay;

[0011] The online partial discharge monitoring device is installed on the surface of the epoxy resin body; this design can meet the signal transmission requirements when monitoring different epoxy resin thicknesses, while reducing interference during the assembly of internal components.

[0012] The line temperature monitoring device is installed inside the connector at the front end of the cable conductor to improve the accuracy of temperature signal acquisition.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1) This utility model of 500kV intelligent online monitoring intermediate joint combines the application of intelligent online partial discharge and temperature monitoring system with 500kV intermediate joint, which can provide early warning of possible insulation defects in cables and accessories, and detect insulation hazards in high-voltage cables and cable joints in advance; it solves the problem of "unmeasurable" partial discharge and temperature signals in traditional lines, and ensures the safe operation of cables;

[0015] 2) This utility model of 500kV intelligent online monitoring intermediate joint addresses the problem of increased epoxy thickness and limited signal transmission in 500kV products by increasing signal strength and improving signal capture capability, thereby controlling the temperature deviation within 2℃ and identifying partial discharge signals within 5pc. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the 500kV intelligent online monitoring intermediate joint of this utility model;

[0017] Figure 2 This is a schematic diagram showing the distribution of the 500kV intelligent online monitoring intermediate joint online detection device of this utility model;

[0018] Among them: 1-500kV cable intermediate joint, 2-temperature signal monitoring device, 3-partial discharge signal monitoring device. Detailed Implementation

[0019] Example 1

[0020] This utility model provides a 500kV intelligent online monitoring intermediate joint, including a 500kV cable intermediate joint 1 and an online monitoring device;

[0021] The 500kV cable intermediate joint 1 includes an epoxy resin body and a stress cone; in this embodiment, the 500kV cable intermediate joint 1 is mainly composed of an epoxy resin body and an EPDM rubber stress cone, and a compression fitting provides a stable surface pressure for each interface over a long period of time, resulting in stable and reliable product performance.

[0022] The online monitoring device includes an online partial discharge signal monitoring device 3, an online temperature signal monitoring device 2, and a monitoring terminal; the partial discharge monitoring device 3 used in this embodiment is the DKY-JFC02 online partial discharge detection system; the online temperature monitoring device 2 used is the DTS2000-TW online temperature detection system;

[0023] The online partial discharge monitoring device 3 includes a partial discharge sensor, a partial discharge acquisition module, and a partial discharge acquisition relay;

[0024] The online temperature monitoring device 2 includes a temperature sensor, a temperature acquisition module, and a temperature acquisition relay;

[0025] The online partial discharge monitoring device 3 is disposed on the surface of the epoxy resin body;

[0026] The line temperature monitoring device 2 is installed at the front end of the cable conductor inside the joint to improve the accuracy of temperature signal acquisition.

[0027] Online partial discharge (PD) acquisition module 3 collects PD signals. A PD sensor converts the PD signals, and after amplification by the PD acquisition relay, the signals are transmitted to the monitoring terminal. Online temperature acquisition module 2 collects temperature signals. A temperature sensor converts the PD signals, and after amplification by the PD acquisition relay, the signals are transmitted to the monitoring terminal. The PD monitoring software and temperature monitoring software in the monitoring terminal perform real-time monitoring of the PD and temperature signals.

Claims

1. A 500kV intelligent online monitoring intermediate joint, characterized in that, The system includes a 500kV cable joint and an online monitoring device. The 500kV cable joint comprises an epoxy resin body and a stress cone. The online monitoring device includes an online partial discharge signal monitoring device, an online temperature signal monitoring device, and a monitoring terminal. The online partial discharge signal monitoring device includes a partial discharge sensor, a partial discharge acquisition module, and a partial discharge acquisition relay. The online temperature signal monitoring device includes a temperature sensor, a temperature acquisition module, and a temperature acquisition relay. The online partial discharge signal monitoring device is disposed on the surface of the epoxy resin body. The online temperature signal monitoring device is disposed inside the joint at the front end of the cable conductor to improve the accuracy of temperature signal acquisition.

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