# US 2013/0158902 A1 · Multi-channel leakage current monitoring system

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- Number: US 2013/0158902 A1
- Document ID: US20130158902A1
- Status: Published application
- Kind: A1
- Application number: 13/668,149
- Filed: 2012-11-02
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Lsis Co., Ltd.
- Inventors: Hyung Kyu KIM
- Web page: https://patentgrep.com/patent/US20130158902A1

## CPC

- G01R 31/52: Testing for short-circuits, leakage current or ground faults
- G01R 31/3277: {of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches}
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

Disclosed is a multi-channel leakage current monitoring system configured to monitor leakage currents transmitted to loads from a plurality of molded case circuit breakers (MCCBs), and to transmit the leakage currents to a smart meter. The system comprises: a plurality of current transformers configured to measure power information data about loads connected to secondary side power lines of the MCCBs; and a multi-channel measuring unit (MCMU) configured to detect a leakage current by analyzing the power information data received from the current transformers. Under such a configuration, the size of the system can be reduced, and the number of communication lines can be minimized.

## Claims

### Claim 1

A multi-channel leakage current monitoring system configured to monitor leakage currents transmitted to loads from a plurality of molded case circuit breakers (MCCBs), and to transmit the leakage currents to a smart meter, the system comprising:
a plurality of current transformers configured to measure power information data about loads connected to secondary side power lines of the MCCBs, and to provide the measured data; and
a multi-channel measuring unit (MCMU) configured to detect a leakage current by analyzing the power information data received from the current transformers.

### Claim 2 (depends on 1)

The system of claim 1, wherein one (master MCMU) of the plurality of MCMUs is connected to the smart meter through a first terminal.

### Claim 3 (depends on 2)

The system of claim 2, wherein the master MCMU is connected to the rest MCMUs (slave MCMUs) of the plurality of MCMUs through second terminals.

### Claim 4 (depends on 1)

The system of claim 1, wherein the MCMU includes:
a controller configured to analyze the power information data received from the current transformers, and to record a leakage current event in the occurrence of a leakage current; and
a storage unit configured to store the leakage current event under control of the controller.

### Claim 5 (depends on 2)

The system of claim 2, wherein the MCMU includes:
a controller configured to analyze the power information data received from the current transformers, and to record a leakage current event in the occurrence of a leakage current; and
a storage unit configured to store the leakage current event under control of the controller.

### Claim 6 (depends on 3)

The system of claim 3, wherein the MCMU includes:
a controller configured to analyze the power information data received from the current transformers, and to record a leakage current event in the occurrence of a leakage current; and
a storage unit configured to store the leakage current event under control of the controller.

### Claim 7 (depends on 4)

The system of claim 4, wherein the controller determines whether a leakage current has occurred or not, by comparing the power information data received from the current transformers, with a leakage current determination basis of a corresponding channel.

### Claim 8 (depends on 7)

The system of claim 7, wherein the leakage current determination basis is provided from the smart meter.

### Claim 9 (depends on 4)

The system of claim 4, wherein the leakage current event includes a leakage current value, a leakage current-occurred time, and a leakage current-occurred channel.