CN209746063U - Hybrid line fault positioning system based on joint acquisition unit - Google Patents
Hybrid line fault positioning system based on joint acquisition unit Download PDFInfo
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- CN209746063U CN209746063U CN201920233508.4U CN201920233508U CN209746063U CN 209746063 U CN209746063 U CN 209746063U CN 201920233508 U CN201920233508 U CN 201920233508U CN 209746063 U CN209746063 U CN 209746063U
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Abstract
the utility model discloses a hybrid line fault location system based on joint department acquisition unit, include: an optical CT and acquisition unit at each joint of the overhead line-cable hybrid line; CT and line protection devices on two sides of the overhead line-cable hybrid line; the light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit and the line protection devices at two sides are connected through the optical fibers; the line protection device carries out differential protection calculation on each section according to the received current signal, and judges a fault section; and if the fault is judged to occur in the overhead line section, the reclosing function is started, and if the fault is judged to occur in the cable section, the reclosing function is locked. The utility model discloses a technical scheme, the equipment that increases is small in quantity, and all logics are all accomplished through the protection device of circuit both sides, carry out trouble district section location to hybrid line according to the reliable differential protection of maturity, and the accuracy is high.
Description
Technical Field
The utility model belongs to electric power system relay protection field relates to a hybrid line fault location system based on joint department collection unit.
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 an overhead line-cable hybrid line fault location system based on joint department acquisition unit.
in order to achieve the above purpose, the solution of the present invention is:
A hybrid line fault location system based on a joint acquisition unit, the hybrid line being an overhead line-cable hybrid line, the system comprising: an optical CT and acquisition unit at each joint of the overhead line-cable hybrid line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
The light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit and the line protection devices at two sides are connected through the 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, and the collection unit transmits the synchronized three-phase current to the line protection devices at two sides; the CTs at two sides of the overhead line-cable mixed line are respectively connected with the line protection device at the side;
the line protection device carries out differential protection calculation on each section according to the received current signal, and judges a fault section; and if the fault is judged to occur in the overhead line section, the reclosing function is started, and if the fault is judged to occur in the cable section, the reclosing function is locked.
Furthermore, the acquisition unit transmits current signals to the line protection devices on two sides by adopting an HDLC protocol.
Furthermore, an HDLC protocol is adopted when the line protection devices on the two sides are connected by adopting optical fibers to transmit current signals.
the utility model has the advantages that: the utility model discloses a hybrid line fault location system based on joint department acquisition unit, the equipment that increases is small in quantity, and all logics are all accomplished through the protection device of circuit both sides, carry out trouble district section location to hybrid line according to the reliable differential protection of maturity, and the accuracy is high.
Drawings
FIG. 1 is a first embodiment of a hybrid line fault location system based on a collection unit at a joint;
Fig. 2 is a second embodiment of a hybrid line fault location system based on a joint acquisition unit.
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 hybrid line fault location system based on joint department acquisition unit, as shown in figure 1. The hybrid line is an overhead line-cable hybrid line, the system comprising: an optical CT and acquisition unit at each joint of the overhead line-cable hybrid line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
The light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit and the line protection devices at two sides are connected through the 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, and the collection unit transmits the synchronized three-phase current to the line protection devices at two sides; the CTs at two sides of the overhead line-cable mixed line are respectively connected with the line protection device at the side;
the line protection device carries out differential protection calculation on each section according to the received current signal, and judges a fault section; and if the fault is judged to occur in the overhead line section, the reclosing function is started, and if the fault is judged to occur in the cable section, the reclosing function is locked.
In the scheme, the acquisition unit transmits current signals to the line protection devices on two sides by adopting an HDLC protocol.
In the above scheme, the HDLC protocol is used when the line protection devices on both sides are connected by optical fiber to transmit current signals.
Fig. 1 shows an embodiment of the present disclosure. The cable-overhead line hybrid line comprises n sections of cable sections and n +1 sections of overhead line sections, namely an overhead line section 1, a cable section 1, an overhead line section 2, cable sections 2 and … …, an overhead line section n, a cable section n and an overhead line section n +1 in sequence.
Cable-overhead line hybrid line fault location system includes: an optical CT11, an optical CT12, an optical CT21, an optical CT22, a light CTn … …, a light CTn1, a light CTn2 at each joint of the multi-segment cable-overhead line hybrid line; the system comprises a collecting unit 11, a collecting unit 12, a collecting unit 21, collecting units 22 and … …, a collecting unit n1 and a collecting unit n2 which are arranged at each joint of a multi-section cable-overhead line mixed line; CT1 and CT2 on two sides of the multi-section cable-overhead line mixed circuit; protection devices 1 and 2 on two sides of a multi-section cable-overhead line hybrid line.
The light CT11, the light CT12, the light CT21, the light CT22, the light CTn … …, the light CTn1 and the light CTn2 respectively collect three-phase currents of all joints of the multi-section cable-overhead line mixed line.
the acquisition unit 11 acquires the three-phase current acquired by the CT11, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on both sides; the acquisition unit 12 acquires the three-phase current acquired by the CT12, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on both sides; the acquisition unit 21 acquires the three-phase current acquired by the CT21, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on both sides; the acquisition unit 22 acquires the three-phase current acquired by the CT22, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on both sides; … …, respectively; the acquisition unit n1 acquires the three-phase current acquired by the CTn1, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on two sides; the acquisition unit n2 acquires the three-phase current acquired by the CTn2, synchronizes the three-phase current, and transmits the synchronized three-phase current to the line protection devices on both sides.
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 CT1, and the protection device 2 obtains the three-phase current of the local side through the CT 2; the protection device 1 and the protection device 2 mutually transmit three-phase current through optical fibers.
the protection device 1 can simultaneously obtain three-phase currents of a CT1 and a CT2 on two sides of a circuit; the protection device 1 performs differential protection calculation on the whole mixed line according to the three-phase currents of the CT1 and the CT 2. The protection device 1 can simultaneously obtain three-phase current at each joint of a multi-section cable-overhead line hybrid circuit, and the protection device 1 performs differential protection calculation on the cable section 1 according to the three-phase current of the CT11 and the CT 12; differential protection calculation is carried out on the cable section 2 according to the three-phase currents of the CT21 and the CT 22; … …, respectively; differential protection calculation is carried out on the cable section n according to three-phase currents of the CTn1 and the CTn 2; accordingly, whether a cable section has a fault is judged. If the protection device 1 judges that the hybrid line has a fault and does not judge that any cable section has a fault, 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 at the same time determines that the cable section has a fault, the reclosing function is locked.
the protection device 2 can simultaneously obtain three-phase currents of the CT1 and the CT2 at 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 CT1 and the CT 2. The protection device 2 can simultaneously obtain three-phase current at each joint of the multi-section cable-overhead line hybrid circuit, and the protection device 2 performs differential protection calculation on the cable section 1 according to the three-phase current of the CT11 and the CT 12; differential protection calculation is carried out on the cable section 2 according to the three-phase currents of the CT21 and the CT 22; … …, respectively; differential protection calculation is carried out on the cable section n according to three-phase currents of the CTn1 and the CTn 2; accordingly, whether a cable section has a fault is judged. If the protection device 2 judges that the hybrid line has a fault and does not judge that any cable section has a fault, 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 at the same time determines that the cable section has a fault, the reclosing function is locked.
Fig. 2 shows another embodiment of the present disclosure. The method comprises the following steps: 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; 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 and synchronizes the three-phase current; the acquisition unit 2 acquires the three-phase current acquired by the CT2 and synchronizes the three-phase current.
The acquisition unit 1 respectively transmits the synchronized three-phase current to the protection device 1 and the protection device 2 on two sides of the circuit through optical fibers, and the transmission protocol adopts an HDLC protocol; the acquisition unit 2 transmits the synchronized three-phase current to the protection device 1 and the protection device 2 on two sides of the circuit respectively through optical fibers, and the transmission protocol adopts an HDLC protocol.
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 a CT3 and a CT4 on two sides of a line and three-phase currents of a CT1 and a CT2 at a joint of an overhead line-cable hybrid line. The protection device 1 performs differential protection calculation on the section of the overhead line 1 according to the three-phase currents of the CT3 and the CT1, performs differential protection calculation on the cable section according to the three-phase currents of the CT1 and the CT2, and performs differential protection calculation on the section of the overhead line 2 according to the three-phase currents of the CT2 and the CT4, so that the fault section is comprehensively judged. If the protection device 1 judges that the fault occurs in the overhead line section, a reclosing function is put into operation; and if the protection device 1 judges that the fault occurs in the cable section, the reclosing function is locked.
The protection device 2 can also simultaneously acquire three-phase currents of the CT3 and the CT4 on two sides of the line and three-phase currents of the CT1 and the CT2 at a joint of the overhead line-cable hybrid line. The protection device 2 performs differential protection calculation on the section of the overhead line 1 according to the three-phase currents of the CT3 and the CT1, performs differential protection calculation on the cable section according to the three-phase currents of the CT1 and the CT2, and performs differential protection calculation on the section of the overhead line 2 according to the three-phase currents of the CT2 and the CT4, so that the fault section is comprehensively judged. If the protection device 2 judges that the fault occurs in the overhead line section, a reclosing function is put into operation; and if the protection device 2 judges that the fault occurs in the cable section, the reclosing function is locked.
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 a joint acquisition unit, wherein the hybrid line is an overhead line-cable hybrid line, the system comprising: an optical CT and acquisition unit at each joint of the overhead line-cable hybrid line; CT and line protection devices on two sides of the overhead line-cable hybrid line; wherein:
The light CT at each joint is connected with the acquisition unit arranged at the joint through optical fibers, and the acquisition unit and the line protection devices at two sides are connected through the 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, and the collection unit transmits the synchronized three-phase current to the line protection devices at two sides; the CTs at two sides of the overhead line-cable mixed line are respectively connected with the line protection device at the side;
The line protection device carries out differential protection calculation on each section according to the received current signal, and judges a fault section; and if the fault is judged to occur in the overhead line section, the reclosing function is started, and if the fault is judged to occur in the cable section, the reclosing function is locked.
2. A hybrid line fault location system based on an acquisition unit at a joint as claimed in claim 1, wherein: the acquisition unit transmits current signals to the line protection devices on the two sides by adopting an HDLC protocol.
3. A hybrid line fault location system based on an acquisition unit at a joint as claimed in claim 1, wherein: and the HDLC protocol is adopted when the line protection devices on the two sides are connected by adopting optical fibers to transmit current signals.
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| CN201920233508.4U CN209746063U (en) | 2019-02-25 | 2019-02-25 | Hybrid line fault positioning system based on joint acquisition unit |
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| CN201920233508.4U CN209746063U (en) | 2019-02-25 | 2019-02-25 | Hybrid line fault positioning system based on joint acquisition unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111565073A (en) * | 2020-04-14 | 2020-08-21 | 南京国电南自电网自动化有限公司 | Wireless optical difference synchronization method and system based on 5G communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111565073A (en) * | 2020-04-14 | 2020-08-21 | 南京国电南自电网自动化有限公司 | Wireless optical difference synchronization method and system based on 5G communication |
| CN111565073B (en) * | 2020-04-14 | 2021-07-30 | 南京国电南自电网自动化有限公司 | Wireless optical difference synchronization method and system based on 5G communication and 5G communication module |
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