Harmonic detection system

Patent metadata

Field	Value
Publication number	US-10951059-B2
Application number	US-201716481142-A
Country	US
Kind code	B2
Filing date	Nov 24, 2017
Priority date	Mar 15, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A harmonic detection system (1) comprises a measurement component (71), a harmonic abnormality determination unit (561), and a smartphone (9). The measurement component (71) is installed at a specific position on a distribution line constituting a distribution network (100), and measures data related to the current of the distribution line. The harmonic abnormality determination unit (561) uses some or all of the data related to current as detection data to detect abnormality related to harmonics. The smartphone (9) is owned by a user (G), and notifies the user that an abnormality has occurred in the distribution line when a harmonic is detected.

First claim

The invention claimed is:

1. A harmonic detection system, comprising:
a measurement component configured to be installed at a specific position on a power line constituting a distribution network, the measurement component measuring data related to current of the power line;
a harmonic detector configured to use some or all of the data related to the current as detection data to detect a harmonic;
a first transmitter configured to transmit a notification indicating that an abnormality has occurred in the power line when the harmonic is detected;
a notification device configured to be owned by a user of power supplied by the power line, the notification device receiving the notification from the first transmitter and notifying the user that the abnormality has occurred in the power line when the harmonic is detected; and
a storage unit configured to store data of the measurement component in association with data of the notification device; and
a smart meter configured to detect an amount of power supplied to the power line,
wherein the storage unit is configured to:
store identification information of the measurement component in association with identification information unique to the smart meter configured to measure power of the power line on which the measurement component is installed, and
store the identification information unique to the smart meter in association with the notification device of a user who owns the smart meter, and
wherein when the harmonic is detected, the first transmitter is configured to transmit the notification to the notification device that is associated with the identification information of the measurement device measuring the current used in detecting the harmonic via the identification information unique to the smart meter in the storage unit.

2. The harmonic detection system according to claim 1 ,
wherein the first transmitter is configured to transmit information related to detection of the harmonic to the notification device when the harmonic is detected and there is a registered user of the power supplied by the power line.

3. The harmonic detection system according to claim 1 , further comprising:
a measuring instrument including the measurement component, the measuring instrument configured to transmit the detection data; and
a management device including the harmonic detector, the management device configured to receive the detection data.

4. The harmonic detection system according to claim 3 ,
wherein the measuring instrument is installed on each of a plurality of power lines, and
the system further comprises a relay configured to receive the detection data transmitted from a plurality of measuring instruments, the relay configured to transmit the detection data to the management device.

5. The harmonic detection system according to claim 1 , comprising:
a measuring instrument including the measurement component, the measuring instrument configured to transmit the detection data;
a relay including the harmonic detector, the relay configured to receive the detection data and transmit detection result data related to detection result produced by the harmonic detector; and
a management device configured to receive the detection result data.

6. The harmonic detection system according to claim 1 , further comprising:
a measuring instrument including the measurement component and the harmonic detector, the measuring instrument configured to transmit detection result data related to harmonic detection result produced by the harmonic detector; and
a management device configured to receive the detection result data.

7. The harmonic detection system according to claim 2 , further comprising:
a second transmitter configured to transmit detection result data related to detection result produced by the harmonic detector to a maintenance device configured to maintain the power line, when the harmonic detector has detected the harmonic,
wherein the first transmitter is provided to the maintenance device.

8. The harmonic detection system according to claim 1 ,
wherein the detection data includes information about a fundamental wave of current of the power line, and about a harmonic to the fundamental wave.

9. The harmonic detection system according to claim 8 ,
wherein the information related to the fundamental wave and the harmonic is a power spectrum of the fundamental wave and the harmonic, and
the harmonic detector determines that the harmonic is included in the fundamental wave when a ratio of the harmonic to the fundamental wave is at or over a preset threshold.

10. The harmonic detection system according to claim 9 ,
wherein a plurality of the thresholds are set so as to increase in stages, and
the harmonic detector determines that a degree of abnormality due to the harmonic is greater the more a larger threshold is exceeded.

11. The harmonic detection system according to claim 8 ,
wherein the information about harmonics to the fundamental wave includes at least information about a third harmonic and a fifth harmonic to the fundamental wave.

12. The harmonic detection system according to claim 4 ,
wherein a plurality of the relays are provided,
a plurality of measuring instruments are divided into a plurality of groups,
each of the relays is configured to receive the detection data and identification information of the measurement devices from the plurality of measuring instruments belonging to each group, and transmit identification information of the relays along with the detection data and the identification information of the measuring instruments, and
the management device includes a storage unit configured to store the detection data in association with identification information of the measuring instruments and identification information of the relays.

13. The harmonic detection system according to claim 5 ,
wherein a plurality of the measuring instruments are provided,
a plurality of the relays are provided,
the plurality of measuring instruments are divided into a plurality of groups,
each of the relays is configured to receive the detection data and identification information of the measuring instruments from the plurality of measuring instruments belonging to each group, and transmit identification information of the relays along with the detection data and the identification information of the measuring instruments, and
the management device includes a storage unit configured to store the detection result data in association with identification information of the measuring instruments and identification information of the relays.

14. The harmonic detection system according to claim 6 ,
wherein the management device includes a storage unit configured to store identification information of the measuring instrument in association with the detection result data.

15. The harmonic detection system according to claim 1 ,
further comprising a storage unit configured to store the detection data or detection result data related to the detection data produced by the harmonic detector, in association with time information.

16. A harmonic detection system according to claim 1 , further comprising:
a transmitter configured to transmit detection result data related to the detection result produced by the harmonic detector to a maintenance device configured to maintain the power line, when the harmonic detector has detected the harmonic.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Adachi Tatsuya
• Takeya Hiroaki
• Sugiura Mitsunori

Classifications

• H02J13/1331

  using wireless data transmission · CPC title

• H02J13/1311

  using the power network as support for the transmission · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• H02J13/333 Primary

  the equipment forming part of substations · CPC title

• H02J3/0012

  characterised by the contingency detection means in AC networks, e.g. using phasor measurement units [PMU], synchrophasors or contingency analysis · CPC title