CN110927522A - Transmission line fault detection method - Google Patents
Transmission line fault detection method Download PDFInfo
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- CN110927522A CN110927522A CN201911199471.9A CN201911199471A CN110927522A CN 110927522 A CN110927522 A CN 110927522A CN 201911199471 A CN201911199471 A CN 201911199471A CN 110927522 A CN110927522 A CN 110927522A
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- temperature
- transmission line
- detection unit
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- power transmission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a method for detecting faults of a power transmission line, which comprises the following steps: the method comprises the following steps: installing a plurality of detection units on different power transmission lines; connecting the detection unit with the power transmission line monitoring platform, and connecting the power transmission line monitoring platform; receiving real-time data detected by the detection unit, and comparing the real-time data with safety monitoring historical data: and comparing and analyzing the power load efficiency of each component in the power grid by using the detected real-time data. The power transmission line fault detection method improves the power supply quality.
Description
Technical Field
The invention belongs to the technical field of food processing, and relates to a power transmission line fault detection method.
Background
With the rapid development of social economy and the rapid improvement of national living standard, the requirements of society on the power supply reliability and the system safety of a power grid are higher and higher. Analyzing the operation safety risk of the power grid, and regulating and controlling the power grid through auxiliary decision-making means such as preventive correction control, state maintenance and the like are important subjects related to national power safety guarantee. Load loss is an important aspect for measuring risk consequences in risk analysis, the actual loss of a power grid after equipment failure can be objectively quantified, and meanwhile, in the research of maintenance and replacement auxiliary strategies based on the risk analysis, the load reduction amount of different load types of each node also needs to be calculated to evaluate indirect loss during shutdown maintenance and operation with diseases. The expected fault scenes considered in the power grid operation risk assessment are numerous, load flow analysis, load reduction calculation and other work are carried out on each fault scene, in the risk assessment, the load flow analysis and the load reduction calculation occupy a large amount of time, and how to effectively improve the calculation efficiency of a load reduction model is a key problem to be solved in the implementation of the online assessment of the power grid operation risk.
When an accident occurs to a power transmission line, the load on the original cable is often required to be switched to other cables to maintain normal power utilization of users, but the excessive load causes larger current and increases the load of the cable, and the insulation of the cable is thermally broken down after a certain temperature is exceeded, so that the overload operation for a long time is not feasible; because the power grid dispatching personnel can generally dispatch and distribute the load of the original cable to other parts of the power grid within two hours before an accident occurs, it becomes more important to predict the temperature rise condition of the temporary overload cable within two hours in a transient state.
At present, a scheme for detecting the temperature rise of the inner conductor of the cable after two hours caused by the transient current-carrying capacity is mainly observed through specific experimental data, lacks of universality and is relatively complex in practical application. Not only can a large amount of experimental resources be consumed, but also the method is difficult to be conveniently applied to actual engineering.
Disclosure of Invention
The invention aims to provide a power transmission line fault detection method, which solves the problem of low power supply efficiency in the existing power transmission line.
The technical scheme adopted by the invention is that the transmission line fault detection method comprises the following steps:
step 1: installing a plurality of detection units, connecting the detection units with a power transmission line monitoring platform, and simultaneously connecting the monitoring platform with an alarm;
step 2: the detection unit detects the alternating current resistance, the environment temperature, the conductor temperature and the temperature of each layered insulating layer when the circuit of the power cable breaks down;
and step 3: determining the thermal resistance and the thermal capacity between the outer surface of the cable outer sheath of the power cable and a soil temperature stabilization point according to the historical operation data of the power cable;
and 4, step 4: acquiring an emergency load current-carrying capacity calculation model of emergency load time according to the alternating current resistance, the environment temperature, the conductor temperature, the temperature of each layer of the insulating layer, the thermal resistance and the thermal capacity;
and 5: and calculating the maximum current-carrying capacity of the power cable, at which the temperature of the power cable does not exceed the set temperature, after the power cable passes the emergency load time according to the emergency load current-carrying capacity calculation model.
The present invention is also characterized in that,
the detection unit comprises a temperature and humidity sensor and a voltage and current detector, alarm values of humidity, temperature, current and voltage values are set in the detection unit, and safety monitoring historical data are recorded.
And the monitoring platform is used for overall management of fault information of each power transmission line.
When the circuit breaks down and the current, temperature, humidity or voltage detected by the detection unit reaches the alarm value range, the alarm starts to buzz.
The detection unit is connected with the monitoring center through wireless network communication.
The invention has the beneficial effects that the method for detecting the faults of the power transmission line comprises the following steps: the power transmission line monitoring system has the advantages that real-time monitoring on power transmission lines in different areas can be achieved through the detection units, the detection units are connected with the monitoring center through wireless network communication, operation information of the power transmission lines can be obtained in time, centralized supervision is achieved, and power supply quality is improved.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Step 1: installing a plurality of detection units, connecting the detection units with a power transmission line monitoring platform, and simultaneously connecting the monitoring platform with an alarm;
the detection unit comprises a temperature and humidity sensor and a voltage and current detector, alarm values of humidity, temperature, current and voltage values are set in the detection unit, and safety monitoring historical data are recorded;
the monitoring platform is used for overall management of fault information of each power transmission line;
step 2: the detection unit detects the alternating current resistance, the environment temperature, the conductor temperature and the temperature of each layered insulating layer when the circuit of the power cable breaks down;
when the circuit breaks down and the current, temperature, humidity or voltage detected by the detection unit reaches the alarm value range, the alarm starts to buzz.
And step 3: determining the thermal resistance and the thermal capacity between the outer surface of the cable outer sheath of the power cable and a soil temperature stabilization point according to the historical operation data of the power cable;
and 4, step 4: acquiring an emergency load current-carrying capacity calculation model of emergency load time according to the alternating current resistance, the environment temperature, the conductor temperature, the temperature of each layer of the insulating layer, the thermal resistance and the thermal capacity;
and 5: and calculating the maximum current-carrying capacity of the power cable, at which the temperature of the power cable does not exceed the set temperature, after the power cable passes the emergency load time according to the emergency load current-carrying capacity calculation model.
The detection unit is connected with the monitoring center through wireless network communication.
The detection unit further comprises a smoke sensor, when the circuit fault is detected and smoke is generated, the monitoring platform can acquire alarm information at the first time and perform actions such as power-off processing in an emergency section, and therefore the potential safety hazard of regeneration is prevented.
The power supply state of the power transmission line can be adjusted in real time according to the emergency load carrying capacity calculation model, and the method is efficient and rapid.
Claims (5)
1. A transmission line fault detection method is characterized by comprising the following steps:
step 1: installing a plurality of detection units, connecting the detection units with a power transmission line monitoring platform, and simultaneously connecting the monitoring platform with an alarm;
step 2: the detection unit detects the alternating current resistance, the environment temperature, the conductor temperature and the temperature of each layer of the insulating layer when the circuit of the power cable breaks down;
and step 3: determining the thermal resistance and the thermal capacity between the outer surface of the cable outer sheath of the power cable and a soil temperature stabilization point according to the historical operation data of the power cable;
and 4, step 4: acquiring an emergency load current-carrying capacity calculation model of emergency load time according to the alternating current resistance, the environment temperature, the conductor temperature, and the temperature, the thermal resistance and the thermal capacity of each layer of the insulating layer;
and 5: and calculating the maximum current-carrying capacity of the power cable, at which the temperature of the power cable does not exceed the set temperature, after the power cable passes through the emergency load time according to the emergency load current-carrying capacity calculation model.
2. The method for detecting the faults of the power transmission lines according to claim 1, wherein the detection unit comprises a temperature and humidity sensor and a voltage and current detector, alarm values of humidity, temperature, current and voltage values are set in the detection unit, and safety monitoring historical data are recorded.
3. The method according to claim 1, wherein the monitoring platform is configured to comprehensively manage fault information of each transmission line.
4. The method for detecting the faults of the power transmission line according to claim 2, wherein when the line is in fault and the current, the temperature, the humidity or the voltage detected by the detection unit reaches the alarm value range, the alarm starts to buzz.
5. The method according to claim 2, wherein the detection unit is connected to the monitoring center through wireless network communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199471.9A CN110927522A (en) | 2019-11-29 | 2019-11-29 | Transmission line fault detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911199471.9A CN110927522A (en) | 2019-11-29 | 2019-11-29 | Transmission line fault detection method |
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| Publication Number | Publication Date |
|---|---|
| CN110927522A true CN110927522A (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911199471.9A Pending CN110927522A (en) | 2019-11-29 | 2019-11-29 | Transmission line fault detection method |
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| CN (1) | CN110927522A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684301A (en) * | 2020-10-27 | 2021-04-20 | 广东电网有限责任公司广州供电局 | Power grid fault detection method and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843783A (en) * | 2017-10-26 | 2018-03-27 | 广州供电局有限公司 | The detection method and system of the emergent load current-carrying capacity of power cable |
-
2019
- 2019-11-29 CN CN201911199471.9A patent/CN110927522A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107843783A (en) * | 2017-10-26 | 2018-03-27 | 广州供电局有限公司 | The detection method and system of the emergent load current-carrying capacity of power cable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684301A (en) * | 2020-10-27 | 2021-04-20 | 广东电网有限责任公司广州供电局 | Power grid fault detection method and device |
| CN112684301B (en) * | 2020-10-27 | 2023-08-04 | 广东电网有限责任公司广州供电局 | Method and device for detecting power grid faults |
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Application publication date: 20200327 |