Method and system for testing a switching installation for power transmission installations

Patent metadata

Field	Value
Publication number	US-10247782-B2
Application number	US-201515311785-A
Country	US
Kind code	B2
Filing date	May 13, 2015
Priority date	May 16, 2014
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

A method and a system (9) for testing a switching installation (30) for power transmission installations are provided. The switching installation (30) comprises a switch (2) which either connects a first side (6) of the switch (2) to a second side (7) of the switch (2) or disconnects it therefrom, and comprises two earthing switches (10, 11). Each of the two earthing switches (10, 11) is provided to either connect the first side (6) or the second side (7) to earth (1) or to disconnect it from earth (1). To test the switching installation (30), a current is generated through the switch (2) and a magnitude of the current through the switch (2) is determined. In this respect, the two earthing switches (10, 11) are closed while the current is generated and while the magnitude of the current is determined.

First claim

The invention claimed is:

1. Method for testing a switching installation for power transmission installations,
wherein the switching installation comprises a switch which either connects a first side of the switch to a second side of the switch or disconnects it therefrom, and comprises two earthing switches,
wherein each of the two earthing switches is provided to either connect the first side or the second side to earth or to disconnect it from earth,
wherein the method comprises:
generating a current through the switch, and
determining a magnitude of the current through the switch,

wherein the two earthing switches are closed during the generation and determination steps.

2. Method according to claim 1 ,
wherein the determination of the magnitude of the current through the switch comprises measuring a current discharging into the earth of the switching installation and determining a total current which is composed of the current through the switch and of the current discharging into the earth.

3. Method according to claim 1 ,
wherein the current through the switch is measured directly in order to determine the magnitude of the current through the switch.

4. Method according to claim 2 ,
wherein the current through the switch is generated by a current source or by a voltage source.

5. Method according to claim 1 ,
wherein the current through the switch is a direct current, an alternating current or a mixture of a direct current and an alternating current.

6. Method according to claim 1 ,
wherein the determination of the magnitude of the current through the switch comprises fitting a split core of a current transformer in order to measure a further current by means of the current transformer and to determine the magnitude of the current through the switch, subject to the measured further current.

7. Method according to claim 1 ,
wherein the magnitude of the current through the switch is determined using a Rogowski coil.

8. Method according to claim 1 ,
wherein the method comprises fitting a split ferrite in order to increase the inductance of a current path to the earth of the switching installation, to thereby force a greater proportion of the generated current through the switch.

9. Method according to claim 1 ,
wherein:
the current through the switch is a direct current, and
the determination of the magnitude of the current through the switch comprises arranging a measuring device which operates by the Néel effect, in order to measure a further current and, on the basis thereof, to determine the current through the switch.

10. Method according to claim 9 ,
wherein a voltage which drops via the switch is determined, and a resistance of the switch is determined on the basis of the magnitude of the current and on the voltage which drops via the switch.

11. Method according to claim 1 ,
wherein the determination of the magnitude of the current through the switch comprises detecting times of an abrupt change in the magnitude of the current in order to derive therefrom switching times of the switch.

12. Method according to claim 1 ,
wherein:
the switching installation comprises a plurality of switches which either connect a respective first side of the respective switch to a second side of the respective switch or disconnect it therefrom, and are configured to switch a multiphase current,
associated with each side is a respective earthing switch to either connect the respective side to earth or to disconnect it from earth, and
a magnitude of a current through each switch is measured directly, or the magnitude of the current through each switch is determined by measuring currents discharging into the earth of the switching installation and by determining a total current which is composed of the currents through the switches and of the currents discharging into the earth.

13. Method according to claim 1 ,
wherein the switching installation is a gas-insulated switching installation.

14. Method according to claim 1 ,
wherein the switch is a load switch or a power switch.

15. System for testing a switching installation for energy transmission installations,
wherein the switching installation comprises a switch which either connects a first side of the switch to a second side of the switch or disconnects it therefrom, and comprises two earthing switches,
wherein each of the two earthing switches is provided to either connect the first side or the second side to earth or to disconnect it from earth,
wherein the system comprises a first device for generating a current, a second device for measuring a measurable variable of the switching installation, and comprises control means,
wherein the system is configured to generate a current through the switch by means of the first device, when the earthing switches are closed, and to determine a magnitude of the current through the switch by the control means, on the basis of the measured variable which was measured by the second device, without one of the two earthing switches being opened for this purpose.

16. System according to claim 15 ,
wherein the second device comprises an ammeter with a Rogowski coil.

17. System according to claim 16 ,
wherein by means of the Rogowski coil, the system is configured to detect current peaks which occur when the switch is switched on or off.

Assignees

• Omicron Electronics Gmbh

Inventors

• Klapper Ulrich
• Renaudin Thomas

Classifications

• H02B13/065 Primary

  Means for detecting or reacting to mechanical or electrical defects · CPC title

• G01R31/3272

  Apparatus, systems or circuits therefor (G01R31/3275 takes precedence) · CPC title

• G01R31/3271 Primary

  of high voltage or medium voltage devices (G01R31/333 takes precedence) · CPC title

• H01H33/027

  Integrated apparatus for measuring current or voltage · CPC title

• G01R31/3274 Primary

  Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance (measuring contact resistance G01R27/205) · CPC title