# US 11,443,155 B2 · Insulator leakage current detector and method of detecting insulator leakage current

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- Number: US 11,443,155 B2
- Document ID: US11443155B2
- Status: Granted
- Kind: B2
- Application number: 16/253,880
- Filed: 2019-01-22
- Published: 2019-07-25
- Granted: 2022-09-13
- Earliest claimed: 2018-01-19
- Assignees: Lindsey Manufacturing Company
- Applicants: Lindsey Manufacturing Co.
- Inventors: Keith E. Lindsey; John McCall
- Web page: https://patentgrep.com/patent/US11443155B2

## CPC

- G06K 19/0723: {the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs}
- G01R 15/181: {using coils without a magnetic core, e.g. Rogowski coils}
- G01R 31/085: {in power transmission or distribution lines, e.g. overhead}
- G01R 31/1245: {of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings}
- G01R 31/1272: {of cable, line or wire insulation, e.g. using partial discharge measurements (locating faults in cables G01R31/083)}
- G01R 31/52: Testing for short-circuits, leakage current or ground faults
- G06K 19/0715: {the arrangement including means to regulate power transfer to the integrated circuit}
- G06K 19/0716: {at least one of the integrated circuit chips comprising a sensor or an interface to a sensor}
- G06K: GRAPHICAL DATA READING (image or video recognition or understanding G06V); PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)

## Abstract

An insulator leakage current detector, an insulator leakage current detecting system, and a method of monitoring insulator leakage current using the same are provided. An insulator leakage current detector mountable on an insulator string includes a sensor to sense leakage current information of the insulator string; and a device to send a signal including the leakage current information sensed by the sensor.

## Claims

### Claim 1

An insulator leakage current detector mountable on an insulator string, the insulator leakage current detector comprising:
a sensor to sense leakage current information of the insulator string; and
a device to wirelessly send a signal including the leakage current information sensed by the sensor to a receiving device, the receiving device being at a location separate from the insulator leakage current detector,
wherein the insulator leakage current detector does not have a power source separate from any power source of the receiving device, and
wherein the device to send the signal including the leakage current information comprises an RFID sensor.

### Claim 2 (depends on 1)

The insulator leakage current detector of claim 1, wherein the sensor comprises a Rogowski coil.

### Claim 3

An insulator leakage current detecting system comprising:
an insulator leakage current detector mountable on an insulator string and comprising:
a sensor to sense leakage current information of the insulator string; and
a device to wirelessly send a signal including the leakage current information sensed by the sensor; and
a receiving device to receive the signal including the leakage current information, the receiving device being at a location separate from the insulator leakage current detector,
wherein the insulator leakage current detector does not have a power source separate from any power source of the receiving device, and
wherein the device to send the signal including the leakage current information comprises an RFID sensor, and the receiving device comprises an RFID transceiver.

### Claim 4 (depends on 3)

The insulator leakage current detecting system of claim 3, wherein the sensor comprises a Rogowski coil.

### Claim 5 (depends on 3)

The insulator leakage current detecting system of claim 3, wherein the receiving device comprises a transmission line monitor mounted on a transmission line, the transmission line being supported by the insulator string.

### Claim 6 (depends on 3)

The insulator leakage current detecting system of claim 3, further comprising a remote monitoring device to which the receiving device is configured to send leakage current data.

### Claim 7

An insulator leakage current detecting system comprising:
an insulator leakage current detector mountable on an insulator string and comprising:
a sensor to sense leakage current information of the insulator string; and
a device to send a signal including the leakage current information sensed by the sensor; and
a receiving device to receive the signal including the leakage current information,
wherein the insulator leakage current detector is mounted at an end of the insulator string opposite a ground.

### Claim 8

A method of detecting an insulator leakage current, the method comprising:
providing an insulator leakage current detector on an insulator string;
sensing leakage current information using a sensor of the insulator leakage current detector; and
wirelessly transmitting a signal including the leakage current information to a receiving device, the receiving device being at a location separate from the insulator leakage current detector,
wherein the insulator leakage current detector does not have a power source separate from any power source of the receiving device, and
wherein transmitting the signal including the leakage current information comprises transmitting the signal from an RFID sensor to an RFID transceiver.

### Claim 9 (depends on 8)

The method of claim 8, further comprising calculating a leakage current based on the leakage current information, and transmitting the calculated leakage current to a remote monitoring station.

### Claim 10 (depends on 8)

The method of claim 8, wherein the leakage current information is a derivative of the leakage current, and the method further comprises integrating the derivative of the leakage current to obtain the leakage current.

### Claim 11 (depends on 1)

The insulator leakage current detector of claim 1, wherein the location of the receiving device is separate from the insulator string.

### Claim 12 (depends on 3)

The insulator leakage current detecting system of claim 3, wherein the location of the receiving device is separate from the insulator string.

### Claim 13 (depends on 8)

The method of claim 8, wherein the location of the receiving device is separate from the insulator string.

### Claim 14

A method of detecting an insulator leakage current, the method comprising:
providing an insulator leakage current detector on an insulator string at an end of the insulator string opposite a ground;
sensing leakage current information using a sensor of the leakage current detector; and
transmitting a signal including the leakage current information to a receiving device.