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US 2026/0291216 A1Published application
Insulation monitoring device (imd), system for monitoring insulation and method for monitoring insulation of imd
AssigneeLs Electric Co., Ltd.
InventorsChangjun KIM, Minsu PARK
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Abstract
Provided is an insulation monitoring device, an insulation monitoring system, and an insulation monitoring method, in which insulation of one of a first zone and a second zone is monitored through selective connection to one of an electric path of the first zone between a transformer and a power conversion device and an electric path of the second zone between the power conversion device and a load according to whether the power conversion device is in operation.
Claims15
An insulation monitoring device configured to monitor insulation of a system, the device comprising:
- a first channel unit connected to an electric path of a first zone between a transformer and a power conversion device in the system;
- a second channel unit connected to a coupling device connected to an electric path of a second zone between the power conversion device and a load in the system;
- and
- a monitoring unit connected to a ground that is not connected to an electric path of the system, connected to one of the first channel unit and the second channel unit according to an operation signal transmitted from the power conversion device, and configured to apply a predetermined signal to one of the ground and the connected channel unit, receive a measurement signal corresponding to the predetermined signal from another channel unit, and determine an insulation status of a zone corresponding to the connected channel unit based on the measurement signal.
1 more element
An insulation monitoring system comprising:
- a transformer configured to transmit a three-phase alternating current (AC) voltage;
- a power conversion device configured to receive the AC voltage from the transformer and convert the AC voltage into a direct current (DC) voltage;
- a first insulation monitoring device configured to monitor insulation of a primary-side electric path of the power conversion device;
- a coupling device configured to receive a signal from a secondary-side electric path of the power conversion device;
- and
- a second insulation monitoring device configured to monitor insulation of a load-side electric path receiving the DC voltage from the power conversion device,
- wherein the first insulation monitoring device comprises:
- a first channel unit configured to receive a signal from the primary-side electric path;
- a second channel unit configured to receive a signal, which is received from the secondary-side electric path, from the coupling device;
- a signal unit configured to apply a predetermined signal to a ground which is not connected to the primary-side electric path and the secondary-side electric path;
- a control unit connected to one of the first channel unit and the second channel unit, and configured to receive a measurement signal corresponding to the predetermined signal from the connected channel unit, and determine an insulation status of an electric path corresponding to the connected channel unit based on the measurement signal;
- and
- a connecting unit configured to connect the first channel unit to the control unit when monitoring the primary-side electric path, and connect the second channel unit to the control unit when monitoring the secondary-side electric path.
10 more elements
An insulation monitoring method of an insulation monitoring device comprising
- a first channel unit configured to receive a signal from a first electric path between a transformer and a power conversion device in a system,
- a second channel unit configured to receive a signal from a coupling device that receives a signal from a second electric path between the power conversion device and a load in the system, and
- a monitoring unit configured to apply a predetermined signal, to a ground to which an electric path of the system is not connected, to determine an insulation status of one of the first electric path and the second electric path based on a signal received from one of the first channel unit and the second channel unit, the method comprising:
- deciding a monitoring mode of the insulation monitoring device;
- connecting to one of the first channel unit and the second channel unit according to the monitoring mode;
- applying the predetermined signal to the ground to receive a measurement signal corresponding to the predetermined signal from a connected channel unit;
- and
- determining an insulation status of an electric path connected to the connected channel unit based on the measurement signal.
5 more elements
Dependencies are inferred from the claim text.