CN113671318A - Traveling wave analysis device and method for 35KV power grid fault point - Google Patents
Traveling wave analysis device and method for 35KV power grid fault point Download PDFInfo
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- CN113671318A CN113671318A CN202110978184.9A CN202110978184A CN113671318A CN 113671318 A CN113671318 A CN 113671318A CN 202110978184 A CN202110978184 A CN 202110978184A CN 113671318 A CN113671318 A CN 113671318A
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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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Abstract
The invention relates to a traveling wave analysis device of a 35KV power grid fault point, which comprises an acquisition mechanism, a data acquisition mechanism and a data processing mechanism, wherein the acquisition mechanism is used for monitoring a looped network; the processing mechanism is used for processing and sending the acquired signals of the acquisition mechanism; and the unloading mechanism is used for carrying out data interaction on the signals processed and analyzed by the processing mechanism. According to the traveling wave analysis method for the 35KV power grid fault point, the position of the fault point is confirmed for the power distribution network, time waste caused by manual searching is reduced, and power is retransmitted in advance.
Description
Technical Field
The invention relates to the technical field of secondary protection of a power grid, in particular to a traveling wave analysis device and method for a 35KV power grid fault point.
Background
Primary devices are devices used on the main system of hair, power transmission, distribution and motors. Such as generators, transformers, circuit breakers, disconnectors, busbars, power cables, transmission lines, large motors, etc.
Secondary protection, which refers to secondary circuits and secondary equipment in the electrical circuit; secondary equipment refers to the equipment that control, protection, supervision and measurement were carried out to the work of primary equipment, includes: such as measuring instruments, relays, operating switches, push buttons, automatic control devices, computers, signal devices, control cables and some power supply devices (such as accumulators, silicon rectifiers, etc.) for supplying power to these devices. The electrical circuit that monitors, controls, regulates and protects primary equipment in an electrical power system is referred to as the secondary circuit.
A relay protection is a kind of secondary equipment, generally known as a relay protection device, which can timely send out a warning signal to an operator on duty or directly send out a trip command to a controlled breaker to terminate the development of events when a fault occurs in a power element (such as a generator, a line, etc.) in a power system or the power system itself, which endangers the safe operation of the power system.
At present, the effect and the effect of secondary protection have been very ripe, can avoid the emergence of trouble effectively, however, after the trouble takes place, the secondary protection can't carry out the fault point again and confirm, let then need the manual work to carry out the detection of fault point, and the confirmation work of fault point is complicated.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a traveling wave analysis method for a 35KV power grid fault point, which is used for confirming the position of the fault point of a power distribution network, reducing time waste caused by manual searching and carrying out power re-transmission in advance.
The technical scheme adopted by the invention is as follows:
a traveling wave analysis device of a 35KV power grid fault point is provided with a plurality of groups, and comprises: a collection mechanism;
the acquisition signal output end of the acquisition mechanism is electrically connected with a processing mechanism;
and the processing signal output end of the processing mechanism is electrically connected with a unloading mechanism.
Further, the collection mechanism includes:
the current sensor is arranged on the cable shielding layer;
and the voltage sensor collects phase voltage and zero sequence voltage.
Further, the voltage sensor is arranged as a voltage transformer.
Further, the processing mechanism includes:
the signal output end of the signal conditioner is respectively and electrically connected with a converter and a comparator;
an adapter electrically connected to the voltage transformer;
the data output ends of the converter and the comparator are electrically connected with a central processing unit powered by an adapter;
the central processor is also electrically connected with a clock synchronizer, a memory and a signal generator.
Further, the unloading mechanism includes:
the repeater is electrically connected with the data sending end of the signal generator and is used for uniformly concentrating data of the signal generators of the multiple groups of wave analysis devices;
unloading mechanism still includes:
and the server is used for carrying out data interaction with the repeater and monitoring the whole power grid.
A traveling wave analysis method for a 35KV power grid fault point comprises the following steps:
in a 35KV power grid, after a branch line of a single bus branching cabinet fails, due to the fact that the load of the whole power distribution network changes, tripping operation is caused on a plurality of/whole power distribution networks;
before power supply is recovered, a fault branch line is determined and discharged, and the other branch lines are sequentially powered on;
the fault branch line is inquired by a traveling wave analysis method, and the method comprises the following steps:
when a branch line has a fault, the conditions of overcurrent and overvoltage can be generated, and simultaneously transient current traveling waves are generated, the abnormality is detected by a voltage sensor and a current sensor and is sent to a signal conditioner, digital signals which can be processed by a central processing unit are respectively formed by a converter and a comparator after being conditioned by the signal conditioner, the digital signals are processed by the central processing unit and are stored in a storage, the synchronously processed signals are concentrated at a repeater by the central processing unit through a synchronous generator, and the content containing synchronous clock signals and data signals is interacted in a server by an upper computer by the repeater;
when a branch line has a fault, the overcurrent and overpressure signals and the synchronous clock signals are processed by a signal conditioner, a converter, a comparator and a central processing unit, and the memory, the repeater and the upper computer are temporarily stored until the server.
Further, the traveling wave analysis method further includes:
when a fault occurs, the initial transient power traveling wave amplitude of the fault line is maximum, the current traveling wave polarity is opposite, and the fault line is obviously distinguished from the non-fault line, so that the fault line is selected.
The traveling wave analysis device for the 35KV power grid fault point has the advantages that: all monitor each branch in the distribution network, can confirm the position of fault point after the branch breaks down, reduce the artifical waste of searching for and causing the time, carry out the no trouble branch in advance and send electricity again.
Drawings
In order to more clearly illustrate the embodiments of the present invention, reference will now be made in brief to the accompanying drawings, which are needed in the description, and in which embodiments of the present invention are illustrated.
Fig. 1 is a general schematic diagram of a traveling wave analysis device for a 35KV grid fault point according to an embodiment of the present invention.
In the figure:
10. a collection mechanism for collecting the collected data,
20. the processing mechanism is used for processing the waste water,
30. and a unloading mechanism.
Detailed Description
In order to clearly and clearly illustrate the specific implementation objects and the implementation modes of the invention, the technical scheme of the invention is completely described below, and the described examples are a part of the examples of the invention, but not all the examples. All other embodiments based on the described embodiments of the invention are within the scope of the invention without making creative efforts.
The invention relates to a traveling wave analysis device of a 35KV power grid fault point, which is provided with a plurality of groups, as shown in figure 1, and comprises the following components: acquisition mechanism 10, as shown in fig. 1, acquisition mechanism 10 includes: the current sensor is arranged on the cable shielding layer, and the voltage sensor is arranged as a voltage transformer;
the collection signal output end of the collection mechanism 10 is electrically connected to a processing mechanism 20, as shown in fig. 1, the processing mechanism 20 includes: the signal output end of the signal conditioner is respectively and electrically connected with a converter and a comparator; an adapter electrically connected to the voltage transformer; the data output ends of the converter and the comparator are electrically connected with a central processing unit powered by an adapter; the central processor is also electrically connected with a clock synchronizer, a memory and a signal generator.
The processing signal output end of the processing mechanism 20 is electrically connected to a unloading mechanism 30, as shown in fig. 1, the unloading mechanism 30 includes: the repeater is electrically connected with the data sending end of the signal generator and is used for uniformly concentrating data of the signal generators of the multiple groups of wave analysis devices; further comprising: and the server is used for carrying out data interaction with the repeater and monitoring the whole power grid.
According to the specific structure of the traveling wave analysis device of the 35KV grid fault point in the foregoing embodiment, the following further describes a traveling wave analysis method of the 35KV grid fault point:
in a 35KV power grid, after a branch line of a single bus branching cabinet fails, due to the fact that the load of the whole power distribution network changes, tripping operation is caused on a plurality of/whole power distribution networks;
before power supply is recovered, a fault branch line is determined and discharged, and the other branch lines are sequentially powered on;
the fault branch line is inquired by a traveling wave analysis method, and the method comprises the following steps:
when a branch line has a fault, the conditions of overcurrent and overvoltage can be generated, and simultaneously transient current traveling waves are generated, the abnormality is detected by a voltage sensor and a current sensor and is sent to a signal conditioner, digital signals which can be processed by a central processing unit are respectively formed by a converter and a comparator after being conditioned by the signal conditioner, the digital signals are processed by the central processing unit and are stored in a storage, the synchronously processed signals are concentrated at a repeater by the central processing unit through a synchronous generator, and the content containing synchronous clock signals and data signals is interacted in a server by an upper computer by the repeater;
when a branch line has a fault, processing an overcurrent signal, an overpressure signal and a synchronous clock signal by a signal conditioner, a converter, a comparator and a central processing unit, and temporarily storing a memory, a repeater and an upper computer until the signals are stored in a server;
the slave server consults: when a fault occurs, the initial transient power traveling wave amplitude of the fault line is maximum, the current traveling wave polarity is opposite, and the fault line is obviously distinguished from the non-fault line, so that the fault line is selected.
Based on the above, the present invention provides an embodiment of a traveling wave analysis apparatus for a 35KV grid fault point, and according to the above description, workers can make various changes and modifications without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A traveling wave analysis device of a 35KV power grid fault point is characterized in that:
the traveling wave analysis device is provided with a plurality of groups and comprises an acquisition mechanism (10);
the acquisition signal output end of the acquisition mechanism (10) is electrically connected with a processing mechanism (20);
the processing signal output end of the processing mechanism (20) is electrically connected with a dump mechanism (30).
2. The traveling wave analysis device for the 35KV grid fault point according to claim 1, characterized in that:
the acquisition mechanism (10) comprising:
the current sensor is arranged on the cable shielding layer;
and the voltage sensor collects phase voltage and zero sequence voltage.
3. The traveling wave analysis device for the 35KV grid fault point according to claim 2, characterized in that:
the voltage sensor is set as a voltage transformer.
4. The traveling wave analysis device for the 35KV grid fault point according to claim 2, characterized in that:
the handling mechanism (20) comprising:
the signal output end of the signal conditioner is respectively and electrically connected with a converter and a comparator;
an adapter electrically connected to the voltage transformer;
the data output ends of the converter and the comparator are electrically connected with a central processing unit powered by an adapter;
the central processor is also electrically connected with a clock synchronizer, a memory and a signal generator.
5. The traveling wave analysis device for a 35KV power grid fault point according to claim 4, characterized in that:
the unloading mechanism (30) comprises:
the repeater is electrically connected with the data sending end of the signal generator and is used for uniformly concentrating data of the signal generators of the multiple groups of wave analysis devices;
the unloading mechanism (30) further comprises:
and the server is used for carrying out data interaction with the repeater and monitoring the whole power grid.
6. The traveling wave analysis method for the 35KV power grid fault point according to claim 5, characterized in that:
in a 35KV power grid, after a branch line of a single bus branching cabinet fails, due to the fact that the load of the whole power distribution network changes, tripping operation is caused on a plurality of/whole power distribution networks;
before power supply is recovered, a fault branch line is determined and discharged, and the other branch lines are sequentially powered on;
the fault branch line is inquired by a traveling wave analysis method, and the method comprises the following steps:
when a branch line has a fault, the conditions of overcurrent and overvoltage can be generated, and simultaneously transient current traveling waves are generated, the abnormality is detected by a voltage sensor and a current sensor and is sent to a signal conditioner, digital signals which can be processed by a central processing unit are respectively formed by a converter and a comparator after being conditioned by the signal conditioner, the digital signals are processed by the central processing unit and are stored in a storage, the synchronously processed signals are concentrated at a repeater by the central processing unit through a synchronous generator, and the content containing synchronous clock signals and data signals is interacted in a server by an upper computer by the repeater;
when a branch line has a fault, the overcurrent and overpressure signals and the synchronous clock signals are processed by a signal conditioner, a converter, a comparator and a central processing unit, and the memory, the repeater and the upper computer are temporarily stored until the server.
7. The traveling wave analysis method for the 35KV power grid fault point according to claim 6, characterized in that:
the traveling wave analysis method further comprises the following steps:
when a fault occurs, the initial transient power traveling wave amplitude of the fault line is maximum, the current traveling wave polarity is opposite, and the fault line is obviously distinguished from the non-fault line, so that the fault line is selected.
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| CN202110978184.9A CN113671318A (en) | 2021-08-24 | 2021-08-24 | Traveling wave analysis device and method for 35KV power grid fault point |
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| CN202110978184.9A CN113671318A (en) | 2021-08-24 | 2021-08-24 | Traveling wave analysis device and method for 35KV power grid fault point |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652157A (en) * | 2016-03-23 | 2016-06-08 | 中国电力科学研究院 | Power distribution network health state analyzing method based on traveling wave electrical quantities |
| CN106771884A (en) * | 2017-01-24 | 2017-05-31 | 山东博鸿电气股份有限公司 | Power distribution network service cable line fault alignment system |
| CN110244190A (en) * | 2019-07-18 | 2019-09-17 | 淄博威纳电气有限公司 | A kind of feeder line fault on-line monitoring and positioning system |
| CN110736900A (en) * | 2019-12-04 | 2020-01-31 | 国家电网有限公司 | distribution line single-phase earth fault line selection method based on directional traveling waves |
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- 2021-08-24 CN CN202110978184.9A patent/CN113671318A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652157A (en) * | 2016-03-23 | 2016-06-08 | 中国电力科学研究院 | Power distribution network health state analyzing method based on traveling wave electrical quantities |
| CN106771884A (en) * | 2017-01-24 | 2017-05-31 | 山东博鸿电气股份有限公司 | Power distribution network service cable line fault alignment system |
| CN110244190A (en) * | 2019-07-18 | 2019-09-17 | 淄博威纳电气有限公司 | A kind of feeder line fault on-line monitoring and positioning system |
| CN110736900A (en) * | 2019-12-04 | 2020-01-31 | 国家电网有限公司 | distribution line single-phase earth fault line selection method based on directional traveling waves |
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