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

Patent metadata

Field	Value
Publication number	US-12372570-B2
Application number	US-202418749527-A
Country	US
Kind code	B2
Filing date	Jun 20, 2024
Priority date	Jun 23, 2023
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

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

The invention claimed is:

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 isolating (S 1 ) the isolable subsystems to be monitored for a duration of a measuring interval (ΔT) with all-pole semiconductor disconnectors (SW),
continued operating (S 2 ) the isolated isolable subsystems ( 20 ) to be monitored by means of its integrated energy storage ( 22 ) during the measuring interval (ΔT),
measuring (S 3 ) an insulation resistance (R f ) of the isolable subsystems ( 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 measuring (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 2 , characterized in that the implemented measuring method is a pulse measuring method with an evaluation of a time constant determined in the isolable subsystems ( 20 ) by a capacitance charge.

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

5. The method according claim 1 , characterized in that should the all-pole 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 integrated energy storage ( 22 ) is used when using a convertor system in the isolable subsystems ( 20 ) and/or switching power supply's energy storage 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 all-pole semiconductor disconnectors (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 isolable subsystems ( 20 ) to be monitored for a duration of a measuring interval (ΔT), operation of the isolated isolable subsystems ( 20 ) to be monitored being continued by means of an 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 isolable subsystems ( 20 ) during the measuring interval (ΔT).

9. The electric circuit arrangement ( 2 ) according to claim 8 , characterized in that the all-pole 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

• G01R31/40

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

• G01R31/08

  Locating faults in cables, transmission lines, or networks · 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

• G01R27/18

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