MONITORING ARRANGEMENT FOR ELECTRICAL EQUIPMENT, AND MONITORING SYSTEM

Abstract

A monitoring arrangement for electrical equipment includes a first sensor for sensing a surface creeping current on a creeping path-lengthening electrically insulating housing of the equipment. A monitoring system includes electrical equipment, the monitoring arrangement, a communication device for transmitting data to a central server device, and a central server device configured to receive and evaluate the data.

Claims

1-22. (canceled)

23. A monitoring arrangement for electrical equipment, the monitoring arrangement comprising: a first sensor for detecting a surface creeping current on a creeping path-lengthening electrically insulating housing of the equipment.

24. The monitoring arrangement according to claim 23, wherein said first sensor has an electrically conductive electrode.

25. The monitoring arrangement according to claim 23, which further comprises a second sensor configured to detect a voltage applied to the equipment, said second sensor evaluating at least one of an electrical or magnetic field in an environment of the equipment.

26. The monitoring arrangement according to claim 23, which further comprises a service life recording device measuring a service life of the equipment from a time of installation and issuing a maintenance signal at specified service milestones of the equipment.

27. The monitoring arrangement according to claim 23, which further comprises a third sensor configured to detect acoustic signals in an environment of the equipment.

28. The monitoring arrangement according to claim 23, wherein the equipment has an electrical insulator.

29. The monitoring arrangement according to claim 23, wherein the equipment has a surge arrester with at least one varistor.

30. The monitoring arrangement according to claim 25, wherein said second sensor provides measurement data from which third harmonics are determined, and a degree of aging of at least one varistor of a surge arrester of the equipment is determined based on the third harmonics.

31. The monitoring arrangement according to claim 30, which further comprises a fourth sensor for detecting an operating temperature of a varistor.

32. The monitoring arrangement according to claim 31, wherein the surge arrester has a housing with a viewing window fitted with a transparent and infrared-permeable material, and said fourth sensor has a measuring device for infrared light.

33. The monitoring arrangement according to claim 23, wherein the equipment has a surge arrester with at least one varistor, and a fifth sensor detects a leakage current of the surge arrester.

34. The monitoring arrangement according to claim 33, wherein said fifth sensor is configured to detect a total leakage current composed of a leakage current through at least one varistor of the surge arrester and a creeping current through the electrically insulating housing.

35. The monitoring arrangement according to claim 33, wherein said fifth sensor is configured for detecting DC currents and AC currents.

36. The monitoring arrangement according to claim 35, wherein said fifth sensor has an ohmic resistor and a spark gap, and a rectifier is provided for rectification of AC currents.

37. The monitoring arrangement according to claim 35, wherein said fifth sensor has a Hall-type probe.

38. The monitoring arrangement according to claim 23, wherein the equipment has a surge arrester with at least one varistor, and a sixth sensor is configured to detect a density of an electrically insulating protective gas.

39. The monitoring arrangement according to claim 25, which further comprises: a third sensor configured to detect acoustic signals in an environment of the equipment; a fourth sensor configured to detect an operating temperature of a varistor of a surge arrester of the equipment; a fifth sensor configured to detect a leakage current of the surge arrester; a sixth sensor configured to detect a density of an electrically insulating protective gas; and a data store for storing measured values acquired by said sensors.

40. The monitoring arrangement according to claim 23, which further comprises a power supply configured to recover energy via an Ethernet connection.

41. The monitoring arrangement according to claim 23, which further comprises an energy storage device for supplying energy.

42. A monitoring system, comprising: electrical equipment; a monitoring arrangement according to claim 23; a communication device for transmitting data; and a central server device configured to receive and evaluate the data transmitted by said communication device.

43. The monitoring system according to claim 42, wherein said communication device is configured to transmit the data via at least one way as follows: Ethernet, USB, serial interface 1× RS485, IEC 61850 Standard, radio, GSM, 2G, 3G, 4G, 5G, long range radio, NFC, Bluetooth, W-LAN, fiber optic cables, powerline communication, Modbus, Modbus RTU, Modbus ASCII or Modbus TCP.

44. The monitoring system according to claim 43, wherein said central server device is configured to determine a degree of contamination of the electrically insulating housing based on a determined creeping current.

Description

[0057] For a better explanation of the invention, FIG. 1 shows a schematic drawing of an exemplary embodiment of the invention.

[0058] A surge arrester 2 has a plurality of varistor disks 8, 10 or voltage-dependent resistors in its interior, which are stacked on top of one another to form an arrester column and are clamped between two end fittings 28. The clamping is produced in a so-called cage construction using tension elements 24. The tension elements 24 are, for example, rods made of glass-fiber-reinforced plastic (fiberglass). The arrester column which is clamped in this way is arranged in a tubular housing 25, which is surrounded by an electrically insulating housing 4 with a creeping-path-lengthening shielding. The creeping-path-lengthening shielding can be made from silicone rubber or porcelain, for example. In addition, the surge arrester 2 has a first connecting bolt 26. On the earth side, a second connecting bolt 27 is connected to an earth cable 36. The tube 25 and the insulating housing 4 have an opening 11 at one point in which a viewing window 12 is provided. The viewing window 12 is sealed in a fluid-tight manner with a transparent glass that is permeable to infrared light, made of a suitable glass or plastic, for example.

[0059] The surge arrester is monitored for a wide range of operating parameters by means of a monitoring arrangement 1. This has a first sensor 3, which is arranged on the creeping-path-lengthening shield for detecting a surface creeping current. This first sensor 3 is connected to an input 31 of a housing 35. A second sensor 5 is designed to detect a voltage applied to the surge arrester 2, and captures the electrical and/or magnetic field in the environment of the surge arrester 2. This second sensor 5 is connected to an input 34. A fourth sensor 9 is provided for detecting an operating temperature of a varistor 10. For this purpose, the sensor 9 has a measuring device for infrared light and is arranged on the viewing window 11. The fourth sensor 9 is connected to an input 33. A third sensor 7 is arranged in the vicinity of the surge arrester 2 and is designed to detect acoustic signals. This sensor 7 is connected to an input 32.

[0060] In the housing 35 of the monitoring arrangement 1, inputs 30-34 are connected to a computing device 17 via data communication lines 37. The latter has a data store 14. The sensor measurement data arriving at inputs 30-34 is transmitted to the computing device 17 and combined and pre-processed for transmission there. The computing device 17 is connected to a communication device 18 via an additional data communication line 37. The communication device 18 is designed for data transmission 20 via radio to a cloud application 19. A power supply 15, which is designed to recover energy via an Ethernet connection 16, and an energy storage device 16 are also provided in the housing 35. A service life recording device 6 is provided to measure the service life of the surge arrester 2 from the time of installation and to send a maintenance signal to the communication device 18 via an additional data communication line at specified service life milestones of the surge arrester. In the cloud application 19, which can be understood as a server device with decentralized resources, the sensor measurement data is further processed and presented in a structured manner, for example, as part of a fleet management system for a plurality of items of equipment to be monitored. This information can be transmitted to a mobile device 22 by means of data communication link 21. For example, the mobile device is a mobile phone or tablet. This has a display device 23, for example a touch screen. In this way, a maintenance technician can easily determine the operating state of the surge arrester 2 at any time and from any location and, if necessary, initiate maintenance or repair measures.

[0061] Previous monitoring systems such as the well-known “ACM advanced” do not have a plurality of inputs in order to be able to acquire a wide range of sensor measurement data at the same time. This is a great advantage over previous devices.