CN209746070U - Hybrid line fault positioning system based on differential zone distinguishing device - Google Patents
Hybrid line fault positioning system based on differential zone distinguishing device Download PDFInfo
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- CN209746070U CN209746070U CN201920233426.XU CN201920233426U CN209746070U CN 209746070 U CN209746070 U CN 209746070U CN 201920233426 U CN201920233426 U CN 201920233426U CN 209746070 U CN209746070 U CN 209746070U
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Abstract
The utility model discloses a hybrid line fault location system based on differential district section discriminating gear, include: the system comprises an optical CT, an acquisition unit and a differential section discrimination device at the joint of an overhead line-cable hybrid line; CT and line protection device on both sides of the overhead line-cable hybrid line. The differential section judging device judges whether the cable section has a fault or not through differential protection calculation. When the differential section judging device judges that the cable section has a fault, a locking reclosing signal is sent out and transmitted to the protection devices on two sides of the line, and the fault section of the hybrid line is positioned. If the protection devices on the two sides of the line judge that the fault occurs in the overhead line section, the reclosing function is started; and if the protection devices on the two sides of the line judge that the fault occurs in the cable section, locking the reclosing function. The utility model discloses a technical scheme, overall structure is clear simple, carries out trouble district section location, the accuracy height to the hybrid line according to the reliable differential protection of maturity.
Description
Technical Field
The utility model belongs to electric power system relay protection field relates to a hybrid line fault location system based on differential district section discriminating gear.
Background
currently, there are a large number of hybrid overhead line-cable lines in the power grid. Overhead lines pass through mountains, cables are deeply buried in the ground or the sea floor, and when the overhead lines or the cables break down, the accurate positions of the faults are difficult to determine, so that the rapid positioning of fault points of the power lines is the key for accelerating the repair of the power lines and reducing the power failure time. Overhead line faults are mostly transient faults, while cable faults are mostly permanent faults due to manufacturing flaws or insulation degradation over time. In order to improve the reliability of power supply, automatic reclosing is generally adopted for line protection. However, for a permanent fault, reclosing will cause another impact on the system, which affects the stable operation of the system. This requires fault location of the overhead line-cable hybrid line, which should be implemented when a fault occurs in the overhead line section and locked when a fault occurs in the cable section.
According to different distance measurement principles, the hybrid line fault distance measurement algorithm can be mainly divided into a traveling wave method and a fault analysis method. The travelling wave method has the advantages of high ranging speed, no influence of transition resistance and the like, but is easily influenced by repeated folding and reflection of travelling waves at joints of overhead lines and cable lines, has the problem of wave head identification, needs to invest special equipment and has relatively complex technology. The fault analysis method has low requirement on equipment, small investment and strong engineering practicability, but has the problems of large calculation amount and false root identification when the line distribution parameters are used for searching and calculating, and the distance measurement precision of the algorithm for fault positioning by adopting the searching and calculating is also influenced by the threshold value.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a hybrid line fault location system based on differential district section differentiates device.
in order to achieve the above purpose, the solution of the present invention is:
A hybrid line fault location system based on a differential zone discrimination device, wherein the hybrid line is an overhead line-cable hybrid line and comprises 3 zones, a head zone and a tail zone are overhead line zones, and a middle zone is a cable zone, the system comprises: the system comprises an optical CT, an acquisition unit and a differential section discrimination device at two joints of an overhead line-cable mixed line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
connection mode inside the system:
the light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit is connected with the differential zone discrimination device arranged at the joint through the optical fibers; the two differential section discriminating devices are connected through optical fibers; the light CT at each joint collects the three-phase current at the joint and transmits the three-phase current to the collection unit at the joint, and the collection unit transmits the synchronized three-phase current to the differential section discrimination device at the joint; the two differential section discriminating devices transmit the three-phase current of the joint to each other through optical fibers;
The CTs at two sides of the multi-section cable-overhead line mixed line are respectively connected with the line protection device at the side;
Each differential section distinguishing device is connected with the line protection device on one side, differential protection calculation is carried out on the cable section by the differential section distinguishing devices according to the three-phase currents at the two joints, and after the cable section is judged to have a fault, a locking reclosing signal is sent to the connected line protection device.
Furthermore, the HDLC protocol is adopted for transmitting current signals among the differential section discrimination devices.
Further, the differential section judging device transmits a locking reclosing signal to the line two-side protection device by adopting an HDLC protocol or a GOOSE protocol.
The utility model has the advantages that: the utility model discloses a hybrid line fault location system based on differential district section discriminating gear, overall structure is clear simple, carries out fault district section location to hybrid line according to the reliable differential protection of maturity, and the accuracy is high.
Drawings
FIG. 1 is an embodiment of a hybrid line fault location system based on differential zone discrimination.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
the utility model provides a mixed line fault positioning system based on a differential zone distinguishing device,
a hybrid line fault location system based on a differential zone discrimination device, wherein the hybrid line is an overhead line-cable hybrid line and comprises 3 zones, a head zone and a tail zone are overhead line zones, and a middle zone is a cable zone, the system comprises: the system comprises an optical CT, an acquisition unit and a differential section discrimination device at two joints of an overhead line-cable mixed line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
The connection mode inside the system is as follows:
the light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit is connected with the differential zone discrimination device arranged at the joint through the optical fibers; the two differential section discriminating devices are connected through optical fibers; the light CT at each joint collects the three-phase current at the joint and transmits the three-phase current to the collection unit at the joint, and the collection unit transmits the synchronized three-phase current to the differential section discrimination device at the joint; the two differential section discriminating devices transmit the three-phase current of the joint to each other through optical fibers;
The CTs at two sides of the multi-section cable-overhead line mixed line are respectively connected with the line protection device at the side;
each differential section distinguishing device is connected with the line protection device on one side, differential protection calculation is carried out on the cable section by the differential section distinguishing devices according to the three-phase currents at the two joints, and after the cable section is judged to have a fault, a locking reclosing signal is sent to the connected line protection device.
In the scheme, the line protection device is used for judging whether the whole mixed line has faults or not; the differential section judging device is used for judging whether the cable has a fault or not. The method for judging whether the whole hybrid line has faults by the line protection device comprises differential protection, distance protection and zero sequence protection. And after judging that the cable section has a fault, the differential section judging device sends out a locking reclosing signal to be transmitted to the connected line protection device. If the protection device acts and does not receive a locking reclosing signal sent by the differential section judging device, judging that the fault occurs in an overhead line section, and putting into a reclosing function; if the protection devices on the two sides of the line act and receive a locking reclosing signal sent by the differential section judging device, the fact that a fault occurs in the cable section is judged, and the locking reclosing function is achieved.
The current signals transmitted between the differential section discrimination devices adopt an HDLC protocol.
And the differential section judging device transmits a locking reclosing signal to the line two-side protection device by adopting an HDLC protocol or a GOOSE protocol.
fig. 1 shows an embodiment of the present invention. The hybrid line fault positioning system based on the differential zone discrimination device comprises: optical CT1 and optical CT2 at the overhead wire-cable hybrid line junction; the system comprises an acquisition unit 1 and an acquisition unit 2 at the joint of an overhead line-cable hybrid line; a differential section discrimination device 1 and a differential section discrimination device 2 at the joint of the overhead wire-cable hybrid line; CT3 and CT4 on both sides of the overhead line-cable hybrid line; protection device 1 and protection device 2 on both sides of the overhead line-cable hybrid line.
CT1 and CT2 acquire three-phase currents at the overhead wire-cable hybrid line junction.
The acquisition unit 1 acquires three-phase current acquired by the CT1, synchronizes the three-phase current, and transmits the synchronized three-phase current to the differential section discrimination device 1; the acquisition unit 2 acquires the three-phase current acquired by the CT2, synchronizes the three-phase current, and transmits the synchronized three-phase current to the differential section discrimination device 2.
the differential section discriminating device 1 and the differential section discriminating device 2 mutually transmit three-phase current through optical fibers, and the transmission protocol adopts an HDLC protocol.
the differential zone discriminating device 1 can simultaneously obtain three-phase currents of CT1 and CT2 at the joint of the overhead wire-cable hybrid line. The differential section determination device 1 performs differential protection calculation on the cable section according to the three-phase currents of the CT1 and the CT2, and if the cable section is determined to have a fault, a locking reclosing signal is sent out and transmitted to the protection devices 1 on two sides of the line. The differential section discriminating device 1 transmits the locking reclosing signal to the protection device 1 by adopting an HDLC protocol or a GOOSE protocol.
The differential section discriminating device 2 can also simultaneously obtain the three-phase currents CT1 and CT2 at the joint of the overhead wire-cable hybrid line. The differential section judging device 2 performs differential protection calculation on the cable section according to the three-phase currents of the CT1 and the CT2, and if the cable section is judged to have a fault, a locking reclosing signal is sent out and transmitted to the protection devices 2 on two sides of the line. The differential section discriminating device 2 transmits the locking reclosing signal to the protection device 2 by adopting an HDLC protocol or a GOOSE protocol.
The protection device can adopt differential protection, distance protection and zero sequence protection to judge the fault of the whole mixed line. In this embodiment, differential protection is used. The protection device 1 obtains the three-phase current of the local side through the CT3, and the protection device 2 obtains the three-phase current of the local side through the CT 4; the protection device 1 and the protection device 2 mutually transmit three-phase current through optical fibers, and the transmission protocol adopts an HDLC protocol.
The protection device 1 can simultaneously acquire three-phase currents of the CT3 and the CT4 on two sides of a line. The protection device 1 performs differential protection calculation on the whole mixed line according to the three-phase currents of the CT3 and the CT 4. If the protection device 1 judges that the hybrid line has a fault and does not receive a locking reclosing signal sent by the differential section judging device 1, judging that the fault occurs in an overhead line section and putting into a reclosing function; if the protection device 1 determines that the hybrid line has a fault and receives a locking reclosing signal sent by the differential section determination device 1, the protection device determines that the fault occurs in the cable section and has a locking reclosing function.
The protection device 2 can simultaneously acquire three-phase currents of the CT3 and the CT4 on two sides of the circuit. The protection device 2 performs differential protection calculation on the whole mixed line according to the three-phase currents of the CT3 and the CT 4. If the protection device 2 judges that the hybrid line has a fault and does not receive a locking reclosing signal sent by the differential section judging device 2, judging that the fault occurs in an overhead line section and putting into a reclosing function; if the protection device 2 determines that the hybrid line has a fault and receives a locking reclosing signal sent by the differential section determination device 2, the protection device determines that the fault occurs in the cable section and has a locking reclosing function.
Above embodiment only is for explaining the utility model discloses a technical thought can not be injectd with this the utility model discloses a protection scope, all according to the utility model provides a technical thought, any change of doing on technical scheme basis all falls into the utility model discloses within the protection scope.
Claims (3)
1. A hybrid line fault location system based on differential zone discrimination devices, characterized by: the hybrid line is an overhead line-cable hybrid line, and comprises 3 sections, wherein the head section and the tail section are overhead line sections, the middle section is a cable section, and the system comprises: the system comprises an optical CT, an acquisition unit and a differential section discrimination device at two joints of an overhead line-cable mixed line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
the connection mode inside the system is as follows:
the light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit is connected with the differential zone discrimination device arranged at the joint through the optical fibers; the two differential section discriminating devices are connected through optical fibers; the light CT at each joint collects the three-phase current at the joint and transmits the three-phase current to the collection unit at the joint, and the collection unit transmits the synchronized three-phase current to the differential section discrimination device at the joint; the two differential section discriminating devices transmit the three-phase current of the joint to each other through optical fibers;
The CTs at two sides of the multi-section cable-overhead line mixed line are respectively connected with the line protection device at the side;
Each differential section distinguishing device is connected with the line protection device on one side, differential protection calculation is carried out on the cable section by the differential section distinguishing devices according to the three-phase currents at the two joints, and after the cable section is judged to have a fault, a locking reclosing signal is sent to the connected line protection device.
2. A hybrid line fault location system based on differential zone discrimination devices as claimed in claim 1 wherein: the current signals transmitted between the differential section discrimination devices adopt an HDLC protocol.
3. A hybrid line fault location system based on differential zone discrimination devices as claimed in claim 1 wherein: and the differential section judging device transmits a locking reclosing signal to the line two-side protection device by adopting an HDLC protocol or a GOOSE protocol.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920233426.XU CN209746070U (en) | 2019-02-25 | 2019-02-25 | Hybrid line fault positioning system based on differential zone distinguishing device |
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| CN201920233426.XU CN209746070U (en) | 2019-02-25 | 2019-02-25 | Hybrid line fault positioning system based on differential zone distinguishing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036726A (en) * | 2021-02-26 | 2021-06-25 | 国网浙江省电力有限公司电力科学研究院 | Cable-overhead hybrid line intelligence reclosing system based on 5G |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113036726A (en) * | 2021-02-26 | 2021-06-25 | 国网浙江省电力有限公司电力科学研究院 | Cable-overhead hybrid line intelligence reclosing system based on 5G |
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