CN105977931A - Disconnected-null-line and default-phase protection apparatus and method, and power grid fault positioning apparatus - Google Patents
Disconnected-null-line and default-phase protection apparatus and method, and power grid fault positioning apparatus Download PDFInfo
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- CN105977931A CN105977931A CN201610413681.3A CN201610413681A CN105977931A CN 105977931 A CN105977931 A CN 105977931A CN 201610413681 A CN201610413681 A CN 201610413681A CN 105977931 A CN105977931 A CN 105977931A
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- power line
- line communication
- communication apparatus
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- force
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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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- 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a disconnected-null-line and default-phase protection apparatus and method, and a power grid fault positioning apparatus. Whether a power line is in failure or not can be determined by the communication condition between electric line communication apparatus; which section of the power line is in failure and which line in the A/B/C/PEN phase is in failure can be found; the connection between the power line in failure and the power grid can be disconnected; the fault points can be accurately positioned and removed; the disconnected-null-line and default-phase protection apparatus provided by the invention can enable the circuit breaker to act to remove faults no matter which line in the A/B/C/PEN phase is in failure; therefore, the shortcoming that effective disconnected-null-line and default-phase protection cannot be performed in the prior art is overcome; meanwhile, the electric line communication apparatus, a control apparatus and the low-voltage circuit breaker used in the invention are all quite mature products in the prior art, so that the cost is saved; and popularization and application can be achieved easily.
Description
Technical field
The present invention relates to Power System Faults Detection field, be specifically related to a kind of phase-lacking protective device off zero, method and electric network fault positioner.
Background technology
At present power domain is typically selected low-voltage circuit breaker as the main protection device of low-voltage network.Low-voltage circuit breaker is that one is possible not only to connect and disjunction normal duty electric current and overload electric current, it is also possible to connect and the device for switching of disjunction short circuit current.Low-voltage circuit breaker except rising in addition to control action, also has certain defencive function in circuit, such as overload, short circuit, under-voltage and earth leakage protective etc..When low-voltage network be short-circuited, earth fault, the fault such as electric leakage time, low-voltage circuit breaker all can well action by failure removal, but when there is off zero or open-phase fault, chopper cannot be by failture evacuation, the most in the art, the problem that the most effective method or apparatus solves phase shortage off zero.Below phase shortage off zero is simply introduced:
In low-voltage distribution system (TN-C system: A, B, C, PEN, TN-S system: A, B, C, N, PE), A, B, C are phase (fiery) line, and N line is the neutral conductor, and PE line is protective wire, and protective earthing-neutral conductor is that working zero line doubles as ground protection line.In TN system, PE line is not allow to disconnect, and N line can disconnect under special circumstances, but must disconnect (saying on stricti jurise that N line could must disconnect after A, B, C phase line disconnects) together with A, B, C phase line.At TN system run duration, PEN or N line is not allow to disconnect, and produces " off zero " fault if occurring PEN or N line to disconnect i.e..For a long time, PEN or the N line that is in operation disconnects i.e. " off zero " fault and happens occasionally, in the case of there is single-phase load, threephase load scarcely balances, and causes neutral displacement, when there is fault off zero, initiation phase voltage is raised suddenly, overflow phasing voltage more than 1.3 times, chopper akinesia, so certainly will cause single-phase device damage, the threephase motor cannot be properly functioning, What is more be also possible to cause casualties.And when certain reason drop (phase shortage) of a wherein phase phase line of A, B, C three-phase in low-voltage network, three phase electric equipment (particularly threephase motor) also can be made normally to work, even result in accident.
Summary of the invention
The purpose of the application is the defect solving prior art, it is provided that a kind of phase-lacking protective device off zero, and to overcome the defect that can not find and get rid of the open-phase fault off zero occurred in low-voltage network in prior art in time, the technical scheme of employing is as follows:
A kind of phase-lacking protective device off zero; front N-1 the low-voltage circuit breaker put including the power line communication apparatus being connected on the N number of point selected on electric lines of force, being serially connected with in the N number of point selected on electric lines of force and N-1 control device; described N-1 control device go forward with electric lines of force respectively N-1 point on power line communication apparatus and low-voltage circuit breaker electrically connect, the power line communication apparatus on each point with adjacent the next one put on power line communication apparatus pass through power line communication.
Power line communication full name is power line carrier communication, refers to utilize high-voltage power line (being often referred to 35kV and above in power carrier field), medium voltage power line (referring to 10kV electric pressure) or low-voltage distribution wire (380/220V subscribers feeder) to carry out voice or a kind of specific communication mode of data transmission as information transmitting medium.
Due to the feature that power line communication apparatus is intrinsic, when between two points, one section of electric lines of force conducting is good, communication between the power line communication apparatus of the two point is the best, and when after a certain phase line drop of this section of electric lines of force, for the communication of this line with regard to drop between two power line communication apparatus, therefore the most well detect, by communication mutual between power line communication apparatus, position (which section electric lines of force breaks down) that whether electric lines of force break down, break down and fault type is the most effective.The present invention uses this principle, judges whether electric lines of force breaks down by the signal intelligence between power line communication apparatus, and which section electric lines of force breaks down, that single line generation disconnection fault in A/B/C/PEN phase.Control device and then check the signal intelligence receiving power line communication apparatus, if the communication between the power line communication apparatus being electrically connected with adjacent next power line communication apparatus is broken, the low-voltage circuit breaker then controlling to be attached thereto disconnects, so that the electric lines of force of faulty section disconnects with electrical network.Substantially; no matter which section breaks down; that single line generation disconnection fault in A/B/C/PEN phase; the present invention can make the electric lines of force of corresponding section disconnect the connection with electrical network; excision fault, overcomes the defect can not effectively protected phase shortage off zero in prior art, and power line communication apparatus, control device and the low-voltage circuit breaker used in the present invention are all products highly developed in prior art; save cost, easily promoted the use of.
As preferably, described control device has also electrically connected storage device.
Described storage device is used for storing the information such as abort situation, fault type.
As preferably, described low-voltage circuit breaker has electrically connected alarm device, and described alarm device has electrically connected communicator, and described alarm device is for after circuit breaker trip isolated fault, send alarm signal, and sent electronic equipment and the background system of the extremely maintainer of binding by communicator.
As preferably, described communicator is gsm module.
As preferably, described power line communication apparatus is electric power modem.
The application another object is that the defect solving prior art, it is provided that a kind of phase failure protection method off zero, and the technical scheme of employing is as follows:
A kind of phase failure protection method off zero, disconnects with electrical network including the electric lines of force making abort situation, excises fault, and the process obtaining abort situation includes:
Electric lines of force is selected N number of point, each point connects a power line communication apparatus, N >=2；
Know whether electric lines of force breaks down and abort situation and fault type according to the signal intelligence between power line communication apparatus with adjacent next power line communication apparatus.
Due to the feature that power line communication apparatus is intrinsic, when between two points, one section of electric lines of force conducting is good, communication between the power line communication apparatus of the two point is the best, and when after a certain phase line drop of this section of electric lines of force, for the communication of this line with regard to drop between two power line communication apparatus, therefore the most well detect, by communication mutual between power line communication apparatus, position (which section electric lines of force breaks down) that whether electric lines of force break down, break down and fault type is the most effective.The present invention uses this principle, judging whether electric lines of force breaks down by the signal intelligence between power line communication apparatus, which section electric lines of force breaks down, that single line generation disconnection fault in A/B/C/PEN phase, and make that section of electric lines of force broken down disconnect the connection with electrical network, excise fault.Substantially; no matter which section breaks down, that single line generation disconnection fault in A/B/C/PEN phase, and the present invention can make the electric lines of force of corresponding section disconnect the connection with electrical network; excision fault, overcomes the defect can not effectively protected phase shortage off zero in prior art.
As preferably, front N-1 the point of electric lines of force all installs one and controls device, and be allowed to electrically connect with the power line communication apparatus in corresponding point；All concatenate a low-voltage circuit breaker on front N-1 point on electric lines of force, and be allowed to electrically connect with the control device in corresponding point；Signal intelligence between the power line communication apparatus being attached thereto by controlling device inspection to receive with the power line communication apparatus on adjacent next point, if the communication disruption between the power line communication apparatus being attached thereto with the power line communication apparatus on adjacent next point, then the electric lines of force between two power line communication apparatus of explanation breaks down, the low-voltage circuit breaker that then this control device controls to be attached thereto disconnects, thus the connection of the electric lines of force of abort situation with electrical network is disconnected, excise fault.
Control device and then check the signal intelligence receiving power line communication apparatus, if the communication between the power line communication apparatus being electrically connected with adjacent next power line communication apparatus is broken, the low-voltage circuit breaker then controlling to be attached thereto disconnects, so that the electric lines of force of faulty section disconnects with electrical network.Power line communication apparatus, control device and the low-voltage circuit breaker used in the present invention are all products highly developed in prior art, have saved cost, have easily promoted the use of.
As preferably, present invention additionally comprises and abort situation and fault type information are stored.
As preferably, present invention additionally comprises after excision fault, produce alarm signal, and alarm signal is sent to electronic equipment or the background system of the maintainer of binding.
As preferably, described power line communication device is electric power modem.
The application another object is that the defect solving prior art, it is provided that a kind of electric network fault localization method, and the technical scheme of employing is as follows:
A kind of electric network fault positioner, including the power line communication apparatus being connected on the N number of point selected on electric lines of force, power line communication apparatus on each point passes through power line communication with the power line communication apparatus on adjacent next point, if this point disconnects with the communication of the power line communication device on adjacent next point, then the power line section between explanation the two point breaks down.
Along with the development of power system, power system transmission line electric pressure and transmission capacity are all stepping up, and the fault of transmission line of electricity is accurately positioned technology and is the most increasingly paid attention to by people.Fault is accurately positioned and work of electric power system personnel can be helped to find abort situation accurately and rapidly, and this is for repairing circuit in time, recovering reliable power supply, it is ensured that the safety and stability of power system and economical operation suffer from highly important effect.The present invention is by selecting N number of installation power line communication apparatus on electric lines of force, and the electric lines of force fault occurred in electric lines of force specifically navigated between which two point by the communications status between these power line communication apparatus is broken down, and facilitates maintainer to overhaul.
Compared with prior art, beneficial effects of the present invention:
By the signal intelligence between power line communication apparatus, the present invention judges whether electric lines of force breaks down; which section electric lines of force breaks down; any single line generation disconnection fault in A/B/C/PEN phase; and make that section of electric lines of force broken down disconnect the connection with electrical network; realization is accurately positioned trouble point and excises fault; and no matter any single line generation disconnection fault in A/B/C/PEN phase; the present invention can make breaker actuation; excision fault, overcomes the defect can not effectively protected phase shortage off zero in prior art.Meanwhile, power line communication apparatus, control device and the low-voltage circuit breaker used in the present invention are all products highly developed in prior art, have saved cost, have easily promoted the use of.
Accompanying drawing explanation
Fig. 1 is the structural representation of the protection device of the present invention；
Fig. 2 is the fundamental diagram of the protection device of the present invention.
Detailed description of the invention
With embodiment, the present invention is described in further details below in conjunction with the accompanying drawings.
Embodiment 1 :As shown in Figure 1; a kind of phase-lacking protective device off zero; front N-1 the low-voltage circuit breaker put including the power line communication apparatus being connected on the N number of point selected on electric lines of force, being serially connected with in the N number of point selected on electric lines of force and N-1 control device; described N-1 control device go forward with electric lines of force respectively N-1 point on power line communication apparatus and low-voltage circuit breaker electrically connect, the power line communication apparatus on each point with adjacent the next one put on power line communication apparatus pass through power line communication.
Due to the feature that power line communication apparatus is intrinsic, when between two points, one section of electric lines of force conducting is good, communication between the power line communication apparatus of the two point is the best, and when after a certain phase line drop of this section of electric lines of force, for the communication of this line with regard to drop between two power line communication apparatus, therefore the most well detect, by communication mutual between power line communication apparatus, position (which section electric lines of force breaks down) that whether electric lines of force break down, break down and fault type is the most effective.The present embodiment uses this principle, judges whether electric lines of force breaks down by the signal intelligence between power line communication apparatus, and which section electric lines of force breaks down, that single line generation disconnection fault in A/B/C/PEN phase.Control device and then check the signal intelligence receiving power line communication apparatus, if the communication between the power line communication apparatus being electrically connected with adjacent next power line communication apparatus is broken, the low-voltage circuit breaker then controlling to be attached thereto disconnects, so that the electric lines of force of faulty section disconnects with electrical network.Substantially, no matter which section breaks down, that single line generation disconnection fault in A/B/C/PEN phase.
Described control device has also electrically connected storage device.
Described storage device is used for storing the information such as abort situation, fault type.
Described low-voltage circuit breaker has electrically connected alarm device, described alarm device has electrically connected communicator, described alarm device, for after circuit breaker trip isolated fault, is sent alarm signal, and is sent electronic equipment and the background system of the extremely maintainer of binding by communicator.
In the present embodiment, described communicator is gsm module.
In the present embodiment, described power line communication apparatus is electric power modem.
Embodiment 2 :As in figure 2 it is shown, a kind of phase failure protection method off zero, disconnecting with electrical network including the electric lines of force making abort situation, excise fault, the process obtaining abort situation includes:
Electric lines of force is selected N number of point, each point connects a power line communication apparatus, N >=2；
Know whether electric lines of force breaks down and abort situation and fault type according to the signal intelligence between power line communication apparatus with adjacent next power line communication apparatus.
In the present embodiment, front N-1 the point of electric lines of force all installs one and controls device, and be allowed to electrically connect with the power line communication apparatus in corresponding point；All concatenate a low-voltage circuit breaker on front N-1 point on electric lines of force, and be allowed to electrically connect with the control device in corresponding point；Signal intelligence between the power line communication apparatus being attached thereto by controlling device inspection to receive with the power line communication apparatus on adjacent next point, if the communication disruption between the power line communication apparatus being attached thereto with the power line communication apparatus on adjacent next point, then the electric lines of force between two power line communication apparatus of explanation breaks down, the low-voltage circuit breaker that then this control device controls to be attached thereto disconnects, thus the connection of the electric lines of force of abort situation with electrical network is disconnected, excise fault.
In Fig. 2, electric lines of force is selected four points, first three point is all installed a power line communication apparatus, controls device and low-voltage circuit breaker, low-voltage circuit breaker, control device and power line communication apparatus on each point are sequentially connected electrically, wherein 11,12,13,14 is power line communication apparatus, 21,22,23 for controlling device, and 31,32,33 is low-voltage circuit breaker.Such as, when I section of electric lines of force conducting is good, communication between power line communication apparatus 11 and 12 is good, if but which phase line drop of I section of electric lines of force, then just breaking relative to this phase line between power line communication apparatus 11 and 12, this timed unit 21 controls low-voltage circuit breaker 31 action, disconnects the connection of I section of electric lines of force and electrical network, excises fault.And for example, when II section of electric lines of force conducting is good, communication between power line communication apparatus 12 and 13 is good, if but which phase line drop of II section of electric lines of force, then just breaking relative to this phase line between power line communication apparatus 12 and 13, this timed unit 22 controls low-voltage circuit breaker 32 action, disconnects the connection of II section of electric lines of force and electrical network, excises fault.
The present embodiment also includes storing abort situation and fault type information.
After the present embodiment is additionally included in excision fault, produces alarm signal, and alarm signal is sent to electronic equipment or the background system of the maintainer of binding.
Described power line communication device is electric power modem.
Claims (10)
1. a phase-lacking protective device off zero; it is characterized in that; front N-1 the low-voltage circuit breaker put including the power line communication apparatus being connected on the N number of point selected on electric lines of force, being serially connected with in the N number of point selected on electric lines of force and N-1 control device; described N-1 control device go forward with electric lines of force respectively N-1 point on power line communication apparatus and low-voltage circuit breaker electrically connect, the power line communication apparatus on each point with adjacent the next one put on power line communication apparatus pass through power line communication.
One the most according to claim 1 phase-lacking protective device off zero, it is characterised in that described N-1 control device has been both electrically connected with storage device.
One the most according to claim 1 phase-lacking protective device off zero, it is characterised in that described low-voltage circuit breaker has electrically connected alarm device, described alarm device has electrically connected communicator.
One the most according to claim 1 phase-lacking protective device off zero, it is characterised in that described power line communication apparatus is electric power modem.
5. a phase failure protection method off zero, including, make the electric lines of force of abort situation disconnect with electrical network, excise fault, it is characterised in that the process obtaining abort situation includes:
Electric lines of force is selected N number of point, each point connects a power line communication apparatus, N >=2；
Know whether electric lines of force breaks down and abort situation and fault type according to the signal intelligence between power line communication apparatus with adjacent next power line communication apparatus.
One the most according to claim 5 phase failure protection method off zero, it is characterised in that all install one on front N-1 the point of electric lines of force and control device, and be allowed to electrically connect with the power line communication apparatus in corresponding point；All concatenate a low-voltage circuit breaker on front N-1 point on electric lines of force, and be allowed to electrically connect with the control device in corresponding point；Signal intelligence between the power line communication apparatus being attached thereto by controlling device inspection to receive with the power line communication apparatus on adjacent next point, if the communication disruption between the power line communication apparatus being attached thereto with the power line communication apparatus on adjacent next point, then the electric lines of force between two power line communication apparatus of explanation breaks down, the low-voltage circuit breaker that then this control device controls to be attached thereto disconnects, thus the connection of the electric lines of force of abort situation with electrical network is disconnected, excise fault.
One the most according to claim 5 phase failure protection method off zero, it is characterised in that also include storing abort situation and fault type information.
One the most according to claim 5 phase failure protection method off zero, it is characterised in that after excision fault, produces alarm signal, and alarm signal is sent to electronic equipment or the background system of the maintainer of binding.
One the most according to claim 5 phase failure protection method off zero, it is characterised in that described power line communication apparatus is electric power modem.
10. an electric network fault positioner, it is characterized in that, including the power line communication apparatus being connected on the N number of point selected on electric lines of force, power line communication apparatus on each point passes through power line communication with the power line communication apparatus on adjacent next point, if this point disconnects with the communication of the power line communication device on adjacent next point, then the power line section between explanation the two point breaks down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610413681.3A CN105977931A (en) | 2016-06-14 | 2016-06-14 | Disconnected-null-line and default-phase protection apparatus and method, and power grid fault positioning apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610413681.3A CN105977931A (en) | 2016-06-14 | 2016-06-14 | Disconnected-null-line and default-phase protection apparatus and method, and power grid fault positioning apparatus |
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| CN105977931A true CN105977931A (en) | 2016-09-28 |
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| CN201610413681.3A Pending CN105977931A (en) | 2016-06-14 | 2016-06-14 | Disconnected-null-line and default-phase protection apparatus and method, and power grid fault positioning apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401176A (en) * | 2019-06-25 | 2019-11-01 | 深圳供电局有限公司 | Zero line disconnection protection device and control method thereof |
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Application publication date: 20160928 |