METHOD AND SYSTEM FOR MONITORING POWER TRANSMISSION LINE OF POWER GRID

• US 20140123750A1
• Filed: 11/29/2011
• Published: 05/08/2014
• Est. Priority Date: 06/10/2011
• Status: Active Grant

• Current Assignee: State Grid Information & Telecommunications Branch Limited
• Original Assignee: State Grid Information & Telecommunications Branch Limited
• Inventors: Liu, Jianming, Chen, Xi, Li, Xiangzhen, Zhen, Yan, Zeng, Lingkang, Ou, Qinghai, He, Qingsu
• Granted Patent: US 9,158,036 B2
• Time in Patent Office: Days
• US Class Current: 73/170.17
• CPC Class Codes: G01N 17/00 Investigating resistance of materials to the weather, to corrosion, or to light
• CPC Class Codes: G01W 1/02 Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover or wind speed G01W1/10 takes precedence
• CPC Class Codes: G01W 1/06 giving a combined indication of weather conditions catathermometers for measuring "cooling value" related either to weather conditions or to comfort of other human environment G01W1/17; computers per se G06
• CPC Class Codes: G01W 1/14 Rainfall or precipitation gauges measuring volume in general G01F
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00017 using optical fiber
• CPC Class Codes: H02J 13/00022 using wireless data transmission
• CPC Class Codes: H02J 13/00024 by means of mobile telephony
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 10/50 Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

A system for monitoring a power transmission line of a power grid, including a first comprehensive sensor (402, 502) disposed at the intermediate position of a power transmission line between two towers including an altimeter, a first acceleration sensor, a temperature and humidity sensor and a rainfall sensor; a second comprehensive sensor (404, 504) disposed at the cable connector of the power transmission line including a leakage current sensor, a tension sensor and a wind speed and direction sensor; and a second acceleration sensor (406, 506) disposed at the intermediate position of the power transmission line between the cable connector of the power transmission line and the first comprehensive sensor (402, 502). A method for monitoring a power transmission line of a power grid, including a step of monitoring the sag condition, wind yaw angle, motion and position tracking, flutter conditions, breeze vibration level, fatigue life and icing situation of a power transmission line. The method and system for monitoring a power transmission line of a power grid effectively prevent and reduce incidents of the power transmission line of the power grid based on sensor multi-dimensional sensing technology combined with the advantages of wireless sensor network technology.

Claims

1. A monitoring system for a power transmission line of a power grid, comprising:

a first integrated sensor disposed at an intermediate position of a power transmission line between two towers or poles, and comprising an altimeter, a first acceleration sensor, a temperature and humidity sensor and a rainfall sensor;

a second integrated sensor disposed at a cable connector of the power transmission line, and comprising a leakage current sensor, a tension sensor and a wind speed and direction sensor; and

a second acceleration sensor disposed at an intermediate position of a power transmission line between the cable connector of the power transmission line and the first integrated sensor.

2. The monitoring system according to claim 1, further comprising a data processing unit, wherein the data processing unit comprises:

a sag state acquiring module configured to acquire a sag state of a power transmission line according to a measurement result from the altimeter, static information about the power transmission line, transmission capacity, and microclimate conditions measured by the temperature and humidity sensor and the rainfall sensor;

a wind yaw angle acquiring module configured to acquire a wind yaw angle of the power transmission line according to measurement data from the altimeter, the first acceleration sensor and the second acceleration sensor, and the microclimate conditions measured by the temperature and humidity sensor and the rainfall sensor;

a motion trajectory acquiring module configured to acquire a motion position trajectory of the power transmission line according to the measurement data from the first acceleration sensor and the second acceleration sensor;

a vibration level and fatigue life acquiring module configured to acquire a breeze vibration level and fatigue life of the power transmission line according to the measurement data from the first acceleration sensor and the second acceleration sensor, measurement data from the wind speed and direction sensor, and measurement data from the temperature and humidity sensor;

a galloping state acquiring module configured to acquire a maximum stress situation of the power transmission line according to the measurement data from the acceleration sensors, and acquire a monitoring result of galloping state of the power transmission line by combining the maximum stress situation, the measurement data from the altimeter and the microclimate conditions; and

an icing situation acquiring module configured to monitor icing situation of the power transmission line according to measurement data from the leakage current sensor and the tension sensor.

3. The monitoring system according to claim 1, wherein the wind speed and direction sensor is an all solid state small-sized ultrasonic resonance type wind speed and direction sensor.

4. The monitoring system according to claim 1, further comprising:

a video monitoring device provided on the power transmission tower or pole, and configured to transmit monitored information of the power transmission line to a monitoring center via wireless communication network.

5. The monitoring system according to claim 1, further comprising:

a backbone node configured to receive data from the first integrated sensor, the second integrated sensor and the second acceleration sensor, and transmit the data monitored by the first integrated sensor, the second integrated sensor and the second acceleration sensor via communication network.

6. The monitoring system according to claim 1, further comprising:

a communication module included in the first integrated sensor, the second integrated sensor or the second acceleration sensor, and configured to transmit the data monitored by the first integrated sensor, the second integrated sensor or the second acceleration sensor to a monitoring center via communication network.

7. The monitoring system according to claim 5, wherein transmission of the data monitored by the first integrated sensor, the second integrated sensor and the second acceleration sensor conforms to multi-hops network protocol.

8. The monitoring system according to claim 1, further comprising:

an optical fiber composite overhead ground wire (OPGW) laid on the power transmission line.

9. The monitoring system according to claim 1, wherein the altimeter is a laser ranging altimeter.

14. The monitoring system according to claim 6, wherein transmission of the data monitored by the first integrated sensor, the second integrated sensor and the second acceleration sensor conforms to multi-hops network protocol

10. A monitoring method for a power transmission line of a power grid, comprising:

monitoring a sag state of the power transmission line according to a measurement result from an altimeter, static information about the power transmission line, transmission capacity, and microclimate conditions measured by a temperature and humidity sensor and a rainfall sensor;

monitoring a wind yaw angle of the power transmission line according to measurement data from the altimeter and an acceleration sensor as well as the microclimate conditions measured by the temperature and humidity sensor and the rainfall sensor;

monitoring a motion position trajectory of the power transmission line according to the measurement data from the acceleration sensor;

acquiring a maximum stress situation of the power transmission line according to the measurement data from the acceleration sensor, and acquiring a monitoring result of galloping state of the power transmission line by combining the maximum stress situation, the measurement data from the altimeter and the microclimate conditions;

monitoring a breeze vibration level and a fatigue life of the power transmission line according to the measurement data from the acceleration sensor, measurement data from a wind speed and direction sensor, and measurement data from the temperature and humidity sensor; and

monitoring an icing situation of the power transmission line according to measurement data from a leakage current sensor and a tension sensor.

11. The monitoring method according to claim 10, further comprising:

monitoring the power transmission line and transmitting information monitored to a monitoring center via communication network.

12. The monitoring method according to claim 10, further comprising:

receiving data monitored by the altimeter, the acceleration sensor, the wind speed and direction sensor, the temperature and humidity sensor, the leakage current sensor and the tension sensor; and

transmitting the data monitored by the altimeter, the acceleration sensor, the wind speed and direction sensor, the temperature and humidity sensor, the leakage current sensor and the tension sensor to a monitoring center via communication network.

13. The monitoring method according to claim 10, wherein monitoring the wind yaw angle of the power transmission line comprises:

acquiring a first wind yaw angle according to the measurement data from the altimeter, the measurement data from the acceleration sensor, and a displacement model;

acquiring a second wind yaw angle according to a current height measured by the altimeter and a historical height;

acquiring a third wind yaw angle according to video or image information;

acquiring a fourth wind yaw angle according to wind speed and direction information and the static information about the power transmission line; and

acquiring a wind yaw angle of the power transmission line by combining the first wind yaw angle, the second wind yaw angle, the third wind yaw angle and the fourth wind yaw angle.