Monitoring arrangement for electrical equipment, and monitoring system

Patent metadata

Field	Value
Publication number	US-11906568-B2
Application number	US-202017618595-A
Country	US
Kind code	B2
Filing date	May 25, 2020
Priority date	Jun 12, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

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.

First claim

The invention claimed is:

1. A monitoring arrangement for electrical equipment, the monitoring arrangement comprising:
a first sensor configured to detect a surface creeping current on a creeping path-lengthening electrically insulating housing of the equipment;
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, and said second sensor providing measurement data;
third harmonics being determined from the measurement data, and a degree of aging of at least one varistor of a surge arrester of the equipment being determined based on the third harmonics.

2. The monitoring arrangement according to claim 1 , wherein said first sensor has an electrically conductive electrode.

3. The monitoring arrangement according to claim 1 , which further comprises a fourth sensor for detecting an operating temperature of a varistor.

4. The monitoring arrangement according to claim 3 , 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.

5. The monitoring arrangement according to claim 1 , 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.

6. The monitoring arrangement according to claim 1 , 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.

7. The monitoring arrangement according to claim 1 , which further comprises a third sensor configured to detect acoustic signals in an environment of the equipment.

8. The monitoring arrangement according to claim 1 , wherein the equipment has an electrical insulator.

9. The monitoring arrangement according to claim 1 , wherein the equipment has a surge arrester with at least one varistor.

10. The monitoring arrangement according to claim 1 , wherein the equipment has a surge arrester with at least one varistor, and a fifth sensor detects a leakage current of the surge arrester.

11. The monitoring arrangement according to claim 10 , 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.

12. The monitoring arrangement according to claim 10 , wherein said fifth sensor is configured for detecting DC currents and AC currents.

13. The monitoring arrangement according to claim 12 , wherein said fifth sensor has an ohmic resistor and a spark gap, and a rectifier is provided for rectification of AC currents.

14. The monitoring arrangement according to claim 12 , wherein said fifth sensor has a Hall-type probe.

15. The monitoring arrangement according to claim 1 , 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.

16. The monitoring arrangement according to claim 1 , which further comprises a power supply configured to recover energy via an Ethernet connection.

17. The monitoring arrangement according to claim 1 , which further comprises an energy storage device for supplying energy.

18. A monitoring system, comprising:
electrical equipment;
a monitoring arrangement according to claim 1 ;
a communication device for transmitting data; and
a central server device configured to receive and evaluate the data transmitted by said communication device.

19. The monitoring system according to claim 18 , 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.

20. The monitoring system according to claim 19 , wherein said central server device is configured to determine a degree of contamination of the electrically insulating housing based on a determined creeping current.

Assignees

• Siemens Energy Global Gmbh & Co Kg

Inventors

• Koch Thomas
• Robben Bastian
• Schubert Matthias

Classifications

• G01R31/14 Primary

  Circuits therefor {, e.g. for generating test voltages, sensing circuits (G01R31/1209 - G01R31/1227 take precedence; for testing switches G01R31/327)} · CPC title

• G01R31/1236

  of surge arresters (monitoring overvoltage diverters or arresters H02H3/048) · CPC title

• H01C7/12

  Overvoltage protection resistors; Arresters · CPC title

• H01B17/005

  Insulators structurally associated with built-in electrical equipment · CPC title

• H01C7/123

  Arrangements for improving potential distribution · CPC title