CN110768219A - GIL-overhead mixed line protection method and system - Google Patents
GIL-overhead mixed line protection method and system Download PDFInfo
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- CN110768219A CN110768219A CN201910989380.9A CN201910989380A CN110768219A CN 110768219 A CN110768219 A CN 110768219A CN 201910989380 A CN201910989380 A CN 201910989380A CN 110768219 A CN110768219 A CN 110768219A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The invention relates to a GIL-overhead mixed line protection method and a system, wherein a GIL-overhead mixed line is composed of a GIL line section and overhead line sections arranged at two ends of the GIL line section, a GIL line protection device and a GIL line far-tripping device are arranged at two sides of the GIL line section at the same time, a mixed line protection device and a mixed line far-tripping device are arranged at two sides of the whole mixed line at the same time, when the GIL line section fails, the GIL line protection device sends a tripping signal to the mixed line far-tripping device at the corresponding side through the GIL far-tripping device at the corresponding side, and when the mixed line far-tripping device receives the tripping signal, the mixed line far-tripping device trips and sends a locking reclosing signal to the mixed line protection device. Therefore, the protection mode is suitable for the GIL-overhead mixed line, the requirement of the GIL-overhead mixed line can be met, and the reliable protection of the GIL-overhead mixed line is realized.
Description
Technical Field
The invention relates to a GIL-overhead mixed line protection method and a system.
Background
Currently, the GIL (gas insulated metal enclosed power transmission line) -overhead hybrid line is very widely used, as shown in fig. 1, the GIL-overhead hybrid line is a conventional GIL-overhead hybrid line topology structure, and a GIL line is arranged between two sections of overhead lines, that is, the GIL-overhead hybrid line topology structure includes a GIL line section and two overhead line sections other than the GIL line section. GIL line sections are very complex in structure, and their characteristics and parameters are significantly different from those of overhead line sections, so that the access of GIL line sections makes the line parameters of hybrid lines no longer uniform. The traditional relay protection principle and protection scheme based on uniform line parameters cannot meet the requirements of the GIL-overhead hybrid line, and the traditional protection method based on uniform line parameters has great errors when applied to the GIL-overhead hybrid line, for example: if the distance protection is adopted, the operation rejection or the false operation may be caused, because the distance protection requires the line parameters to be uniform, and therefore, the reliability of the protection operation is reduced when the traditional protection method based on the uniform line parameters is applied to the GIL-overhead hybrid line.
Disclosure of Invention
The invention aims to provide a GIL-overhead hybrid line protection method and a GIL-overhead hybrid line protection system, which are used for solving the problem that the traditional relay protection based on uniform line parameters possibly causes operation rejection or misoperation, so that the reliability of protection operation is low.
To achieve the above object, the solution of the present invention comprises a GIL-overhead hybrid line protection system, comprising a GIL line section and an overhead line section,
one end of the GIL line section is provided with a first GIL line protection device and a first GIL line long jump device, and the other end of the GIL line section is provided with a second GIL line protection device and a second GIL line long jump device;
one end of the hybrid line is provided with a first hybrid line protection device and a first hybrid line long jump device, and the other end of the hybrid line is provided with a second hybrid line protection device and a second hybrid line long jump device;
the first GIL line long jump device and the first mixed line long jump device are positioned on the same side, and the second GIL line long jump device and the second mixed line long jump device are positioned on the same side;
when a GIL line section breaks down, the first GIL line protection device sends a tripping signal to the first mixed line long tripping device through the first GIL long tripping device, and when the first mixed line long tripping device receives the tripping signal, the first mixed line long tripping device trips and sends a locking reclosing signal to the first mixed line protection device; and the second GIL line protection device sends a tripping signal to the second mixed line long tripping device through the second GIL long tripping device, and the second mixed line long tripping device trips and sends a locking reclosing signal to the second mixed line protection device when receiving the tripping signal.
Has the advantages that: and the remote tripping device of the hybrid line protection device performs tripping action when receiving the tripping signal and sends a locking reclosing signal to the hybrid line protection device, and the locking circuit breakers are overlapped to realize the locking reclosing function when the fault occurs in the GIL line section area. Therefore, the protection system independently sends a trip signal when the GIL line section fails through the additionally arranged GIL line long-trip device, logic judgment of the protection device and sending of other commands are not influenced, the fault protection reliability of the protection system is high, the requirements of the GIL-overhead mixed line are met, and the reliable protection of the GIL-overhead mixed line is realized.
Further, the protection system also comprises induction current releasing devices arranged on two sides of the GIL line section, and when the GIL line section breaks down, the induction current releasing devices are put into use to release induction current. When a GIL line section breaks down, the induced current releasing device can release the induced current in the line, and the safety of the line is improved.
Further, in order to improve the reliability of the protection system, the hybrid line protection device trips when a fault occurs in an overhead line section other than the GIL line section, and recloses if the fault is a transient fault.
The invention also provides a method for protecting the GIL-overhead mixed line,
when a GIL line section breaks down, the first GIL line protection device sends a tripping signal to the first mixed line long tripping device through the first GIL long tripping device, and when the first mixed line long tripping device receives the tripping signal, the first mixed line long tripping device trips and sends a locking reclosing signal to the first mixed line protection device; and the second GIL line protection device sends a tripping signal to the second mixed line long tripping device through the second GIL long tripping device, and the second mixed line long tripping device trips and sends a locking reclosing signal to the second mixed line protection device when receiving the tripping signal.
Has the advantages that: in the GIL-overhead hybrid line, when a GIL line section breaks down, a tripping signal is generated, the newly-added GIL line long tripping device independently sends the tripping signal to the long tripping device of the hybrid line protection device on the corresponding side, the long tripping device of the hybrid line protection device trips when receiving the tripping signal and sends a locking reclosing signal to the hybrid line protection device, and the locking circuit breakers are overlapped to realize the locking reclosing function when the fault occurs in the GIL line section area. Therefore, the GIL-overhead hybrid line has high fault protection reliability on the basis of a newly added GIL line long-jump device, and particularly realizes the reliable protection of the GIL-overhead hybrid line when a GIL line section has a fault.
Further, when the GIL line section breaks down, the induction current releasing device is controlled to be put into operation to release the induction current. When a GIL line section breaks down, the induced current releasing device can release the induced current in the line, and the safety of the line is improved.
Further, in order to improve the reliability of the protection system, the hybrid line protection device trips when a fault occurs in an overhead line section other than the GIL line section, and recloses if the fault is a transient fault.
Further, in order to improve the reliability of the protection system, when a fault occurs in the GIL line section, the hybrid line protection device trips to block reclosure.
Drawings
Fig. 1 is a topological structure diagram of a conventional GIL-overhead hybrid line;
FIG. 2 is a system wiring diagram of an extra-high voltage GIL-overhead hybrid line provided by the present invention;
fig. 3 is a protection configuration diagram of an extra-high voltage GIL-overhead hybrid line provided by the invention.
Detailed Description
The embodiment of the protection method of the GIL-overhead mixed line comprises the following steps:
the present embodiment provides a GIL-overhead hybrid line, which is, for example, an extra-high voltage GIL-overhead hybrid line, as shown in fig. 2. The extra-high voltage GIL-overhead hybrid line is an extra-high voltage GIL-overhead hybrid line in a semi-ring Tazhou-Suzhou section from east to north of Anhui power, and the GIL line section is a line crossing Yangtze river. QF11, QF12, QF13, QF21, QF22 and QF23 are circuit breakers, and CT11, CT12, CT21 and CT22 are current transformers. As shown in fig. 2, the extra-high voltage GIL-overhead hybrid line includes a GIL line section and two overhead line sections outside (i.e., at both ends) the GIL line section. Of course, the extra-high voltage GIL-overhead hybrid line can also be connected with other related lines. Both ends of the hybrid line, i.e. both sides of the whole hybrid line, are provided with circuit breakers.
The invention relates to a line topological structure of a GIL-overhead mixed line, belonging to the prior art. The protection system comprises a GIL line protection device and a hybrid line protection device, wherein for a hybrid line, two GIL line protection devices are arranged on a GIL line section, namely a GIL line protection device A and a GIL line protection device B are respectively arranged on two sides of the GIL line section, and the two GIL line protection devices can exchange information; the GIL line section is also provided with two GIL line far-jump devices, namely a GIL line far-jump device A and a GIL line far-jump device B which are respectively arranged at two sides of the GIL line section, wherein the GIL line protection device A and the GIL line far-jump device A are arranged at one side (the left side) of the GIL line section, and the GIL line protection device B and the GIL line far-jump device B are arranged at the other side (the right side) of the GIL line section; two hybrid line protection devices are arranged on the whole hybrid line, namely a hybrid line protection device A and a hybrid line protection device B are respectively arranged on two sides of the hybrid line, and the two hybrid line protection devices can exchange information; the whole hybrid line is also provided with two hybrid line long-jump devices, wherein the hybrid line protection device A and the hybrid line long-jump device A are arranged on one side (left side) of the hybrid line, and the hybrid line protection device B and the hybrid line long-jump device B are arranged on the other side (right side) of the hybrid line.
The GIL line protection device comprises two parts, namely a fault judgment part and a communication part, wherein the fault judgment part is used for judging whether a GIL line section has a fault, when the GIL line section has the fault, the fault judgment part generates a tripping signal (hereinafter referred to as a far-jump signal), and the communication part is a far-jump signal sending unit and is used for sending the far-jump signal generated by the corresponding fault judgment part. The fault judgment part comprises an electric quantity detection module and a logic judgment module, wherein the electric quantity detection module is arranged on two sides of the GIL line section and is used for detecting electric quantity information on the two sides of the GIL line section, and the electric quantity detection module comprises current transformers (CT3 and CT4) and voltage transformers (PT2 and PT 3); the logic judgment module is used for carrying out protection logic calculation on the received electrical quantity. The far-hop signal transmission unit may be a conventional signal transmission device.
The GIL line long-jump device comprises a long-jump signal receiving unit and a long-jump signal sending unit, wherein the long-jump signal receiving unit of the GIL line long-jump device receives a trip signal sent by the GIL line protection device, and the sending unit of the GIL line long-jump device sends the trip signal to the mixed line long-jump device. The GIL line long-trip device has the function of independently communicating and transmitting trip signals, and the accuracy and the reliability of the transmission of the trip signals are improved.
The hybrid line protection device comprises a far-jump signal receiving unit and a logic judgment unit, wherein the far-jump signal receiving unit can be a conventional signal receiving device. The far-jump signal receiving unit is in communication connection with the far-jump signal transmitting unit of the far-jump device of the GIL line, and because the far-jump signal transmitting unit is far away from the far-jump signal receiving unit, the far-jump signal transmitting unit and the far-jump signal receiving unit can realize communication and data exchange through optical fibers in general and can also be in wireless communication connection. The long jump signal receiving unit receives the long jump signal sent by the long jump signal sending unit, and the logic judgment unit controls the corresponding breaker to trip and sends a locking reclosing signal according to the received trip signal, so that the permanent jump is realized. And the hybrid line protection device also comprises an electrical quantity detection unit which has the same function as the electrical quantity detection module and collects the electrical quantity information at two sides of the hybrid line so as to judge whether a fault occurs. Therefore, the logic judgment unit has the function of controlling the circuit breaker to trip and lock the reclosing according to the received long tripping signal, and also has the function of judging faults according to the electric quantity information of two sides of the mixed line detected by the electric quantity detection unit. Of course, the hybrid line protection device can also be the original line protection device on both sides of the hybrid line, and besides the functions of controlling the tripping of the breaker and locking and reclosing according to the received long tripping signal, the hybrid line protection device also has the original functions: when the internal fault of the whole mixed line occurs, the trip can be reliably carried out, and the external fault is not mistakenly operated.
Induction current discharging devices (FES), such as FES1, FES2, FES3, and FES4 in fig. 2, are also provided on both sides of the GIL line section. And when the GIL line section has an in-zone fault, controlling the induction current releasing device to put in and releasing the induction current. One way of controlling the throw-in of the inductive current discharging means is given below: as shown in fig. 3, auxiliary control devices (corresponding to FES auxiliary control devices in fig. 3) of the induced current discharging devices are additionally arranged on both sides of the hybrid line, control devices (corresponding to FES control devices in fig. 3) of the induced current discharging devices are additionally arranged on both sides of the GIL line section, the auxiliary control devices respectively receive voltage/current signals on both sides of the hybrid line and action information of the hybrid line protection device, and judges the received data information, and then sends the judgment result to the control device of the induced current releasing device, the control device carries out comprehensive judgment according to the voltage/current signals at two sides of the accessed GIL line section, the action information of the GIL line protection device, the information sent by the auxiliary control device and the position information of the induced current releasing device, and controlling the induced current release device according to the comprehensive judgment result, and finally realizing the automatic switching function of the induced current release device after the fault occurs in the GIL line section. In addition, besides the above control modes, the induced current releasing device may also have other control modes, such as: and the GIL line protection device is in control connection with the induced current release device, and when an in-zone fault occurs to the GIL line section, the GIL line protection device sends a control instruction to the induced current release device to control the induced current release device to be put into use.
Therefore, when the GIL line section has an in-zone fault, the GIL line protection device generates a tripping far-jump signal and sends the far-jump signal to the mixed line far-jump device through the GIL line far-jump device, the mixed line far-jump device receives the far-jump signal and controls the circuit breakers on the two sides of the mixed line to trip, and sends a locking reclosing signal to lock the reclosing function of the circuit breakers, so that the circuit breakers on the two sides of the mixed line reliably and permanently jump and simultaneously require no reclosing any more. Also, when an intra-zone fault occurs in the GIL line section, the induced current needs to be discharged.
In addition, when a fault occurs in an overhead line section other than the GIL line section, the hybrid line protection device transmits a trip signal but does not perform the closing reclosing control. Then, if the fault is a transient fault of an overhead line section other than the GIL line section, the hybrid line protection device can still satisfy the reclosing function, and reclosing can be reliably realized.
In fig. 2, 8 fault points F1-F8 are provided, wherein F1, F2, F5 and F6 are in overhead line sections other than GIL line sections, F3 and F4 are in GIL line sections, and F7 and F8 are outside a mixed line zone. The whole protection system is tested for transient metallic fault, permanent metallic fault, developing and converting fault, system oscillation, fault in system oscillation, line idle charge, open loop and closed loop line fault, frequency shift, CT saturation and the like to verify the reliability of the protection system.
1. Metallic transient failure:
(1) when the metal transient faults occur in F1, F2, F5 and F6, the small-difference protection (namely the GIL line protection device) of the GIL line section does not act (the meaning that the GIL line protection device does not act means that a far-jump signal is not generated, the same is carried out below; correspondingly, the meaning that the GIL line protection device acts means that a far-jump signal is generated, the same is carried out below), the two-side protection (namely the mixed line protection device, particularly the large-difference protection) of the mixed line is correctly subjected to phase selection tripping, and the single-phase grounding fault is reliably reclosed.
(2) When the F7 and the F8 have transient metallic faults, the small difference protection of the GIL line section and the protection on the two sides of the hybrid line do not act.
2. Metallic permanent failure:
(1) when permanent metal faults occur in F1, F2, F5 and F6, the small-difference protection of the GIL line section does not act, the protection on the two sides of the hybrid line is correctly subjected to phase selection tripping, the single-phase earth fault is subjected to phase selection tripping, and three-trip acceleration is performed after the fault is superposed.
(2) When the F3 and the F4 have permanent metallic faults, the small difference protection of the GIL line section and the protection on two sides of the hybrid line act. And after the fault occurs, a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the corresponding breaker triphase trips and is locked and reclosed. And, the induction current releasing device is controlled to release the induction current.
3. Developing sudden-transition failure:
(1) when the same fault point spreading fault occurs in F1, F2, F5 and F6, the small difference protection of the GIL line section does not act, the protection of the two sides of the hybrid line is single-hop of the corresponding line, and the second fault is three-hop after the occurrence.
(2) When F2 and F5 have faults, the small-difference protection of the GIL line section does not act, the protection on the two sides of the hybrid line is tripped by correct phase selection, and a reclosing signal is sent. After the fault is converted into the different-name phase fault of F3 and F4, the small-difference protection of the GIL line section and the protection of the two sides of the hybrid line both act. And a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the two sides of the reclosure are locked before reclosure is carried out. And, the induction current releasing device is controlled to release the induction current.
(3) When F3 and F4 have faults, the small difference protection of the GIL line section and the protection of the two sides of the hybrid line both act. And a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the corresponding breaker triphase trips and is locked to be reclosed. And, the induction current releasing device is controlled to release the induction current. After the fault is converted into the faults F2 and F5, the small difference protection of the GIL line section does not act, the protection on the two sides of the mixed line is correctly selected to trip, the reclosure is locked, and the reclosure is not carried out.
(4) When F7 and F8 have faults, the small difference protection of the GIL line section and the protection on the two sides of the hybrid line do not act. After the fault is converted into the faults of F1 and F6, the small difference protection of the GIL line section does not act, the protection on the two sides of the hybrid line is correctly phase-selected and tripped, and the circuit is reliably reclosed.
(5) When F1 and F6 have faults, the small-difference protection of the GIL line section does not act, and the protection on the two sides of the hybrid line is correctly tripped by phase selection and reliably reclosed. After the fault is converted into the faults of F7 and F8, the small difference protection of the GIL line section and the protection on the two sides of the hybrid line do not act.
4. And (3) system stability failure:
full-phase oscillation and non-full-phase oscillation occur in the system, and the small-difference protection of the GIL line section and the protection on the two sides of the hybrid line do not act.
5. Failure again when the system stability is broken:
(1) in system oscillation, when F1, F2, F5 and F6 have faults, the small difference protection of the GIL line section does not act, the protection at the two sides of the mixed line needs to be tripped by correct phase selection, and work is recombined.
(2) When F3 and F4 have faults in system oscillation, the small difference protection of the GIL line section and the protection on two sides of the hybrid empty line both act. And a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the three phases trip and lock the reclosure at two sides. And, the induction current releasing device is controlled to release the induction current.
6. Line empty charging, ring opening and closing and hand-on belt line faults:
(1) and under the condition of an empty charging line, the small difference protection of the GIL line section and the protection of the two sides of the hybrid line do not act.
(2) Under the condition of circuit open-loop and closed-loop, the protection of the small difference of the GIL circuit section and the protection of the two sides of the hybrid circuit do not act.
(3) When the hand-operated hybrid line section fails, the small-difference protection of the GIL line section does not act, and the two sides of the hybrid line are protected to correctly trip the three phases.
(4) When the hand-in GIL line section fails, both the small difference protection of the GIL line section and the protection of the two sides of the hybrid line operate. And a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the three phases trip and lock the reclosure at two sides. And, the induction current releasing device is controlled to release the induction current.
7. System frequency offset:
the system frequency is 48Hz and 52Hz, and when the GIL line section breaks down, the small difference protection of the GIL line section and the protection of the two sides of the mixed line both act. And a far tripping signal of the GIL line protection device is transmitted to the mixed line far tripping device through the GIL line far tripping device, and the three phases trip and lock the reclosure at two sides. And, the induction current releasing device is controlled to release the induction current.
8. CT saturation:
(1) when F7 breaks down, transient saturation occurs to CT on one side of the hybrid line, and the duration time of a normal waveform is not less than 5ms, the small difference protection of the GIL line section and the protection on the two sides of the hybrid line do not act.
(2) When F2 breaks down, transient state saturation occurs on CT at one side of the GIL line section, and the duration time of a normal waveform is not less than 5ms, the small-difference protection of the GIL line section does not act, and the protection at two sides of the hybrid line is correctly phase-selecting tripped.
In the above embodiment, the induced current releasing devices are further installed at both sides of the GIL line section, and when the GIL line section is in a fault, the induced current releasing devices are put into operation to release the induced current. This is only an optimized embodiment and there is no need to include an inductive current relief means in the protection system if the inductive current does not need to be relieved, i.e. there is no need to provide inductive current relief means on both sides of the GIL line section.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
GIL-overhead hybrid line protection system embodiment:
this embodiment provides a protection system for a GIL-overhead hybrid line, and since the protection system is described in detail in the above-mentioned embodiment of the protection method for a GIL-overhead hybrid line, this embodiment will not be specifically described. As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (7)
1. A protection system of GIL-overhead hybrid line, includes GIL line section and overhead line section, its characterized in that still includes:
one end of the GIL line segment section is provided with a first GIL line protection device and a first GIL line long jump device, and the other end of the GIL line segment section is provided with a second GIL line protection device and a second GIL line long jump device;
one end of the hybrid line is provided with a first hybrid line protection device and a first hybrid line long jump device, and the other end of the hybrid line is provided with a second hybrid line protection device and a second hybrid line long jump device;
the first GIL line long jump device and the first mixed line long jump device are positioned on the same side, and the second GIL line long jump device and the second mixed line long jump device are positioned on the same side;
when a GIL line section breaks down, the first GIL line protection device sends a tripping signal to the first mixed line long tripping device through the first GIL long tripping device, and when the first mixed line long tripping device receives the tripping signal, the first mixed line long tripping device trips and sends a locking reclosing signal to the first mixed line protection device; and the second GIL line protection device sends a tripping signal to the second mixed line long tripping device through the second GIL long tripping device, and the second mixed line long tripping device trips and sends a locking reclosing signal to the second mixed line protection device when receiving the tripping signal.
2. The GIL-overhead hybrid line protection system of claim 1, further comprising an induced current discharging means for being disposed at both sides of the GIL line section, the induced current discharging means being operated to discharge the induced current when the GIL line section malfunctions.
3. The GIL-overhead hybrid line protection system of claim 1 or 2, wherein the hybrid line protection device trips when a fault occurs in an overhead line section other than the GIL line section, reclosing in case of a transient fault.
4. A method for protecting a GIL-overhead mixed line is characterized in that,
when a GIL line section breaks down, the first GIL line protection device sends a tripping signal to the first mixed line long tripping device through the first GIL long tripping device, and when the first mixed line long tripping device receives the tripping signal, the first mixed line long tripping device trips and sends a locking reclosing signal to the first mixed line protection device; and the second GIL line protection device sends a tripping signal to the second mixed line long tripping device through the second GIL long tripping device, and the second mixed line long tripping device trips and sends a locking reclosing signal to the second mixed line protection device when receiving the tripping signal.
5. The method for protecting the GIL-overhead hybrid line of claim 4, wherein when the GIL line section is failed, the controlling of the induction current releasing means releases the induction current.
6. The GIL-overhead hybrid line protection method of claim 4 or 5, wherein when a fault occurs in an overhead line section other than the GIL line section, the hybrid line protection device trips, reclosing in case of a transient fault.
7. The method for protecting a GIL-overhead hybrid line as claimed in claim 4 or 5, wherein the hybrid line protection device trips, blocking reclosing when a fault occurs in the GIL line section.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989380.9A CN110768219A (en) | 2019-10-17 | 2019-10-17 | GIL-overhead mixed line protection method and system |
| PCT/CN2020/108295 WO2021073219A1 (en) | 2019-10-17 | 2020-08-10 | Method and system for protecting gil-overhead hybrid line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989380.9A CN110768219A (en) | 2019-10-17 | 2019-10-17 | GIL-overhead mixed line protection method and system |
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| CN110768219A true CN110768219A (en) | 2020-02-07 |
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| CN112350315A (en) * | 2020-11-02 | 2021-02-09 | 天津尚圣科技有限公司 | Novel hybrid power transmission method applied to urban and suburban areas |
| WO2021073219A1 (en) * | 2019-10-17 | 2021-04-22 | 许继集团有限公司 | Method and system for protecting gil-overhead hybrid line |
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| Publication number | Publication date |
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| WO2021073219A1 (en) | 2021-04-22 |
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