Method and electric circuit arrangement for selective insulation monitoring in a power supply system having isolable subsystems

Patent metadata

Field	Value
Publication number	US-2024426894-A1
Application number	US-202418749527-A
Country	US
Kind code	A1
Filing date	Jun 20, 2024
Priority date	Jun 23, 2023
Publication date	Dec 26, 2024
Grant date	—

Abstract

The invention relates to a method ( 1 ) and to an electric circuit arrangement ( 2 ) for selective insulation monitoring in a power supply system ( 10 ) having isolable subsystems ( 20 ) which each has an integrated energy storage ( 22 ). In this context, the subsystem to be monitored ( 20 ) is cyclically and temporarily isolated (S 1 ) for the duration of a measuring interval (ΔT) with all-pole semiconductor disconnectors (SW); operation of the isolated subsystem ( 20 ) to be monitored is continued (S 2 ) by means of its integrated energy storage ( 22 ) during the measuring interval (ΔT); and an insulation resistance (R f ) of the subsystem ( 20 ) is measured (S 3 ) during the measuring interval (ΔT) by means of a standard insulation monitoring device (IMD).

First claim

1 . A method ( 1 ) for selective insulation monitoring in a power supply system ( 10 ) having isolable subsystems ( 20 ) which each has an integrated energy storage ( 22 ), the method comprising the following steps:
cyclic, temporary isolation (S 1 ) of the subsystem to be monitored for the duration of a measuring interval (ΔT) with all-pole semiconductor disconnectors (SW), continued operation (S 2 ) of the isolated subsystem to be monitored ( 20 ) by means of its integrated energy storage ( 22 ) during the measuring interval (ΔT), measuring (S 3 ) an insulation resistance (R f ) of the subsystem ( 20 ) during the measuring interval (ΔT) by means of a standardized insulation monitoring device (IMD).

2 . The method according to claim 1 ,
characterized in that the measurement (S 3 ) is implemented using a measuring method which allows a sufficiently reliable determination of the insulation resistance (R f ) within precisely one measuring interval (ΔT) or in a cyclic sequence of several measuring intervals (ΔT).

3 . The method according to claim 1 ,
characterized in that the implemented measuring method is a pulse measuring method with an evaluation of a time constant determined in the subsystem ( 20 ) by a capacitance charge.

4 . The method according to claim 1 ,
characterized by the use of semiconductor disconnectors (SW) having sufficiently high-impedance isolation properties.

5 . The method according claim 1 ,
characterized in that should the semiconductor disconnectors (SW) not have sufficiently high-impedance isolation properties, a basic insulation value is taken into consideration when determining the insulation resistance (R f ).

6 . The method according to claim 1 ,
characterized in that the convertor's energy storage ( 22 ) is used when using a convertor system in the subsystem ( 20 ) and/or the switching power supply's energy storage ( 22 ) is used when using switching power supplies.

7 . The method according to claim 1 ,
characterized in that a semiconductor rectifier ( 30 ) is used as the semiconductor disconnector (SW).

8 . An electric circuit arrangement ( 2 ) for selective insulation monitoring in a power supply system ( 10 ) having isolable subsystems ( 20 ) which each has an integrated energy storage, the electric circuit arrangement ( 2 ) having all-pole semiconductor disconnectors (SW) for cyclic, temporary isolation (S 1 ) of the subsystem to be monitored ( 20 ) for the duration of a measuring interval (ΔT), operation of the isolated subsystem ( 20 ) to be monitored being continued by means of its integrated energy storage ( 22 ) during the measuring interval (ΔT), and having a standard insulation monitoring device (IMD) for measuring (S 3 ) an insulation resistance (R f ) of the subsystem ( 20 ) during the measuring interval (ΔT).

9 . The electric circuit arrangement ( 2 ) according to claim 8 , characterized in that the semiconductor disconnectors (SW) have a sufficiently high-impedance isolation property.

Assignees

• Bender Gmbh & Co Kg

Inventors

• Hackl Dieter

Classifications

• G01R27/025

  Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters · CPC title

• G01R31/1272 Primary

  of cable, line or wire insulation, e.g. using partial discharge measurements (locating faults in cables G01R31/083) · CPC title

• G01R31/40

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• G01R31/08

  Locating faults in cables, transmission lines, or networks · CPC title

• G01R27/18

  Measuring resistance to earth {, i.e. line to ground} · CPC title