CN107069678A - A kind of electric line thread-breakage protecting and system - Google Patents
A kind of electric line thread-breakage protecting and system Download PDFInfo
- Publication number
- CN107069678A CN107069678A CN201710172797.7A CN201710172797A CN107069678A CN 107069678 A CN107069678 A CN 107069678A CN 201710172797 A CN201710172797 A CN 201710172797A CN 107069678 A CN107069678 A CN 107069678A
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- electric line
- monitoring signals
- line
- transmitting
- electric
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Classifications
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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
-
- 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
-
- 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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—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 for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of electric line thread-breakage protecting and system, methods described includes：Using at least the one of an electric line at least phase line as transmitting an injection monitoring signals；Using the electric line with a little corresponding predeterminated position that transmits the monitoring signals are received as point of collecting mail；Do not receive the monitoring signals in the point of collecting mail, and the electric line main protection it is not operating when, determine described to collect mail point and the electric line between transmitting a little breaks；After the electric line between putting and transmitting a little of collecting mail breaks, start the breaking protection of the electric line.
Description
Technical field
The present invention relates to line upkeep technology, and in particular to a kind of electric line thread-breakage protecting and system.
Background technology
The effect of electric line is conveying and distribution electric energy, is generally set up in power plant to regional transformer station, area and becomes
Between power station and regional transformer station, the circuit referred to as transmission line of electricity for conveying electric energy is line voltage distribution the characteristics of transmission line of electricity
Height, fed distance is remote, and transmission capacity is big.From network system to the circuit of customer power supply and town and country transformation between, for point
Circuit with electric energy is referred to as distribution line.Either transmission line of electricity, or distribution line, is conveying and is distributing the process of electric energy
In, various failures often occur, wherein, the disconnection fault of electric line is one of failure of the difficult differentiation of comparison,
And can produce than larger consequence.
It can configure zero negative sequence element to recognize electric line disconnection fault using asymmetrical component in the prior art, and
Route protection is started by the differential protection of power system or the method for longitudinal distance protection；But, the broken string in this method
Identification is influenceed larger by power system operation mode and electric network composition, and broken string recognition accuracy is relatively low, and then makes route protection
It can not implement well.
The electric measure feature that open-circuit voltage after can also being broken in the prior art using electric line is produced is broken
Line is recognized, and starts corresponding route protection；But, this method is in electric line zero load or underloading, as difficult
To accurately identify broken string, and lead to not start corresponding route protection in time, because open-circuit voltage very little, electric line
Electrical quantity may not change substantially before and after broken string.
When after circuit breaks and during existing line main protection akinesia, it will the stable operation band to power system
Carry out high risks, also bring potential safety hazard to user.
The content of the invention
In view of this, the embodiment of the present invention is expected to provide a kind of electric line thread-breakage protecting and system, in transmission ＆ distribution
When disconnection fault occurs for electric line, it can accurately and rapidly start breaking protection.
To reach above-mentioned purpose, the technical proposal of the invention is realized in this way：
The embodiments of the invention provide a kind of electric line thread-breakage protecting, methods described includes：
Using at least the one of an electric line at least phase line as transmitting an injection monitoring signals；
In the electric line monitoring letter will be received with a little corresponding predeterminated position that transmits as point of collecting mail
Number；
Do not receive the monitoring signals in the point of collecting mail, and the electric line main protection it is not operating when, really
Electric line between determining the collection of letters point and transmitting a little breaks；
After the electric line between putting and transmitting a little of collecting mail breaks, start the disconnected of the electric line
Line is protected.
Preferably, it is described using at least the one of an electric line at least phase line as transmitting an injection monitoring signals,
Including：
Using at least the one of an electric line at least phase line as transmitting an injected frequency different from the power transmission and distribution
The monitoring signals of circuit itself electric energy frequency.
Preferably, it is described using at least the one of an electric line at least phase line at as transmitting an injection monitoring signals
Afterwards, methods described also includes：
Impedance matching is carried out to the monitoring signals, strengthens the transimission power of the monitoring signals.
Preferably, it will be connect described in the electric line with a little corresponding predeterminated position that transmits as point of collecting mail
Receive before the monitoring signals, methods described also includes：
The monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out.
Preferably, the breaking protection for starting the electric line, including：
After the electric line between putting and transmitting a little of collecting mail breaks, the transmission and distribution line is disconnected through delay
The breaker that road is respectively held.
The embodiment of the present invention additionally provides a kind of electric line broken yarn protection system, the system include transmitter unit,
Receiver unit and protection location；Wherein,
The transmitter unit, for will monitor as transmitting an injection at least the one of an electric line at least phase line
Signal；
The receiver unit, for receiving the monitoring signals and determining the power transmission and distribution between putting and transmitting a little of collecting mail
The break-make of circuit；
The protection location, for after the electric line between putting and transmitting a little of collecting mail breaks, starting
The breaking protection of the electric line.
Preferably, the transmitter unit specifically for：
Using at least the one of an electric line at least phase line as transmitting an injected frequency different from the power transmission and distribution
The monitoring signals of circuit itself electric energy frequency.
Preferably, the transmitter unit is additionally operable to：
It is described using at least the one of an electric line at least phase line at as after transmitting injection monitoring signals, it is right
The monitoring signals carry out impedance matching, strengthen the transimission power of the monitoring signals.
Preferably, the receiver unit is additionally operable to：
It will receive described as point of collecting mail with a little corresponding predeterminated position that transmits in the electric line described
Before monitoring signals, the monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out.
Preferably, the protection location specifically for：
After the electric line between putting and transmitting a little of collecting mail breaks, the transmission and distribution line is disconnected through delay
The breaker that road is respectively held.
Electric line thread-breakage protecting provided in an embodiment of the present invention and system, by an electric line at least phase line
As transmitting an injection monitoring signals at least the one of road；In the electric line a little corresponding default position will be transmitted with described
Put and receive the monitoring signals as point of collecting mail；The monitoring signals, and the transmission and distribution line are not received in the point of collecting mail
When the main protection on road is not operating, the electric line between determining the collection of letters point and transmitting a little breaks；Collected mail described
After electric line between putting and transmitting a little breaks, start the breaking protection of the electric line；It can be seen that, the present invention
Embodiment injects the monitoring signals independently of electric line on electric line, by whether the monitoring letter can be received
Number and the main protection of the circuit whether act to determine the disconnection fault of circuit, and thus start corresponding breaking protection, neither
It can be influenceed by power system operation mode and electric network composition, and suitable for various loading conditions, the scope of application is wider.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the electric line thread-breakage protecting of the embodiment of the present invention one；
Fig. 2 is the composition structural representation of the electric line broken yarn protection system of the embodiment of the present invention two；
Fig. 3 is the schematic flow sheet of transmission line of electricity thread-breakage protecting between the transformer station of the embodiment of the present invention three；
Fig. 4 is the composition structural representation of transmission line of electricity broken yarn protection system between the transformer station of the embodiment of the present invention three.
Embodiment
In order to more understand the features of the present invention and technology contents in detail, below in conjunction with reality of the accompanying drawing to the present invention
Now it is described in detail, appended accompanying drawing purposes of discussion only for reference, not for limiting the present invention.
Embodiment one
Fig. 1 is the schematic flow sheet of electric line thread-breakage protecting of the embodiment of the present invention, in the embodiment of the present invention, is needed
The main body for protecting electric line to break can be electric line control protection device, and methods described can be by electric line control
Protection device realizes that the electric line control protection device referred to as controls protection device, as shown in figure 1, methods described includes：
Step 101：Using at least the one of an electric line at least phase line as transmitting an injection monitoring signals；
Here, the monitoring signals are independently of the electric line, therefore will not be by Operation of Electric Systems side
The influence of formula and electric network composition, it is more accurate to monitor.
The electric line can have in multi-phase circuit, the embodiment of the present invention, can be with injection on a phase line wherein
Monitoring signals, only monitor the break-make of a wherein phase line；Different monitoring signals can also be injected separately on each phase line, point
The break-make of each phase line is not monitored.
The monitoring signals can include electric signal and acoustic signals；The electric signal refers to the electricity changed over time
Pressure or electric current, therefore it can be expressed as on mathematical description the function of time, and its waveform can be drawn；The acoustic signals exist
The spread speed in the far super air of spread speed in solid, usually, spread speed of the acoustic signals in fine copper is reachable
3750 meter per seconds, and the aerial spread speed of acoustic signals is only 340 meter per seconds, it is possible to by being noted in electric line
Enter acoustic signals to determine the broken string situation of electric line；
In theory, the monitoring signals of any frequency can serve as the monitoring signals in the embodiment of the present invention, but in order to by
To the interference for avoiding electric line itself electric energy, control protection device is typically chosen frequency different from the electric line itself electricity
The monitoring signals of energy frequency, and the frequency of the signal can not be identical with the frequency for the harmonic wave for endangering the quality of power supply；
Preferably, the frequency of the electric signal can select 300~20000Hz of frequency scope, and this frequency range is real
Apply simple, propagation distance is also distant；The acoustic signals can be ultrasonic signal, and frequency range preferably can be
20000Hz~60000Hz；
In actual use, electric signal is typically chosen as monitoring signals；Relative to acoustic signals, electric signal is easier reality
Apply, use is more extensive.
Further, can be to transmitting a little continual injection monitoring signals in order to recognize disconnection fault in time.
Further, it is described using at least the one of an electric line at least phase line at as transmitting injection monitoring
After signal, this step also includes：
Impedance matching is carried out to the monitoring signals, strengthens the transimission power of the monitoring signals.
In the embodiment of the present invention, it can be a little the end points for being located at a phase line, i.e. circuit usually at transformer station to transmit；
In actual use, transmitting device can be installed transmitting the transformer station computer room near a little, and by the note of transmitting device
Inbound port is by being communicatively connected to described transmit a little；The control protection device controls the transmitting device.
Step 102：In the electric line institute will be received with a little corresponding predeterminated position that transmits as point of collecting mail
State monitoring signals；
Control protection device with described can transmit a little corresponding predeterminated position in the electric line, setting one or one
Collection of letters point more than individual receives the monitoring signals；
Specifically, control protection device can set collect mail point when preset a criterion distance, i.e., it is described collect mail point with it is described
Transmit distance a little within a preset range.
Further, it will received in the electric line with a little corresponding predeterminated position that transmits as point of collecting mail
Before the monitoring signals, methods described also includes：
The monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out；The transmission ＆ distribution
The power frequency amount of electric line is the electric power signal that the electric line needs to convey or dispense in itself, if without filtering out, no
Only can interference monitoring signal, can also damage receiving device.
In the embodiment of the present invention, point of collecting mail is a little the same with transmitting, and can be the end points positioned at a phase line, i.e. usually change
Circuit at power station；
In actual use, receiving device, and connecing receiving device can be installed in transformer station's computer room near point of collecting mail
Receiving end mouthful is communicatively connected to the collection of letters point；The control protection device controls the receiving device.
Step 103：The monitoring signals are not received in the point of collecting mail, and the main protection of the electric line is not moved
When making, the electric line between determining the collection of letters point and transmitting a little breaks；
Here, main protection generally refers to that fast reaction can be carried out to the failure at any point on electric line, and can be very
The control protective unit of fast line disconnection；For ultra-high-tension power transmission line, main protection can be longitudinal differential protection system, according to guarantor
The principle of shield, main protection is further divided into pilot direction, vertical connection distance, longitudinal differential and current phase differential protecting；Main protection
General and control protection device is mutually communicated, and the control protection device can know the action situation of main protection in real time.
When the point of collecting mail receives the monitoring signals in preset time, control protection device is that can determine that the collection of letters
Point is connected with the circuit between transmitting a little；But, for the power transmission and distribution between putting and transmitting a little of being collected mail described in more reliable determination
Circuit breaks, in addition it is also necessary to comprehensive multiple conditions, specifically：
When the point of collecting mail does not receive the monitoring signals in preset time, and the point of collecting mail is transmitted with described
Point is transmitted the distance between a little within a preset range positioned at same phase line, collection of letters point with described, and controlling protection device can be preliminary
Circuit between determining the collection of letters point and transmitting a little breaks；
Wherein, regulation, from injection monitoring signals to the time range for receiving monitoring signals, is in order to avoid other signals
Interference or the delay that causes of special broken string situation because the speed of monitoring signals is all quickly, if monitoring signals are used
Electric signal, then speed be similar to the light velocity；If monitoring signals use acoustic signals, speed is also very fast, far super air
In the velocity of sound, if corresponding monitoring signals can not be received in the short time, can be considered as and not receive monitoring signals；
Regulation collect mail point and the distance range transmitted a little, allow for either electric signal or sound wave letter
Number, have very big decay in the air, in order to avoid erroneous judgement, it is necessary to provide it is described collect mail point with it is described transmit a little apart from model
Enclose.
On the basis of the circuit between primarily determining that the collection of letters point and transmitting a little breaks, then confirm transmission and distribution line
Whether the main protection on road acts；If the main protection of the electric line is also not operating, it can determine more reliably that described
The circuit collected mail between putting and transmitting a little breaks；
Because the action of main protection needs connection and the electrical quantity signal of electric line, if broken under circuit light load
And when being not converted into earth fault, then main protection can not be acted.
Step 104：After the electric line between putting and transmitting a little of collecting mail breaks, start the power transmission and distribution
The breaking protection of circuit.
Specifically, after the electric line between putting and transmitting a little of collecting mail breaks, control protection device is through delay
The breaker that the electric line is respectively held disconnects；
Specifically, it is to export to perform by trip protection that the control protection device, which disconnects the breaker,.
Described to collect mail point and the electric line between transmitting a little breaks, broken string may drop ground or other
Side, and may also have voltage on the line dropped, there is very big potential safety hazard, therefore, control protection device is each by the electric line
The breaker at end disconnects.
Breaking protection needs circuit respectively to hold to configure, and control protection device needs to send shunt tripping signal to its in addition to local terminal
Its breaking protection, could be realized the breaker disconnection at each end；The control protection device respectively held mutually is communicated.
The purpose that the control protection device disconnects the breaker setting delay that the electric line is respectively held is can to ensure master
Protect the reliable judgement to broken string when being failure to actuate.
Specifically, the time of delay could be arranged to 0.1S~0.4S.
Embodiment two
Fig. 2 is the composition structural representation of electric line broken yarn protection system of the embodiment of the present invention, as shown in Fig. 2 institute
Stating system includes transmitter unit 31, receiver unit 32 and protection location 33；Wherein,
The transmitter unit 31, for will supervise as transmitting an injection at least the one of an electric line at least phase line
Survey signal；
The receiver unit 32, for receiving the monitoring signals and determining the transmission ＆ distribution between putting and transmitting a little of collecting mail
The break-make of electric line；
The protection location 33, for after the electric line between putting and transmitting a little of collecting mail breaks, opening
Move the breaking protection of the electric line.
For becoming apparent from for explanation, modules will be elaborated respectively below：
The transmitter unit 31, for will supervise as transmitting an injection at least the one of an electric line at least phase line
Survey signal；
Here, the monitoring signals are independently of the electric line, therefore will not be by Operation of Electric Systems side
The influence of formula and electric network composition, it is more accurate to monitor；
The electric line can have in multi-phase circuit, the embodiment of the present invention, can be with injection on a phase line wherein
Monitoring signals, only monitor the break-make of a wherein phase line, different monitoring signals can also be injected separately on each phase line, point
The break-make of each phase line is not monitored.
The monitoring signals can include electric signal and acoustic signals；The electric signal refers to the electricity changed over time
Pressure or electric current, therefore it can be expressed as on mathematical description the function of time, and its waveform can be drawn；The acoustic signals exist
The aerial spread speed of the remote ultrasonic wave of spread speed in solid, usually, spread speed of the acoustic signals in fine copper
Up to 3750 meter per seconds, and the aerial spread speed of acoustic signals is only 340 meter per seconds, it is possible to by transmission and distribution line
Road injects acoustic signals to determine the broken string situation of electric line；
In theory, the monitoring signals of any frequency can serve as the monitoring signals in the embodiment of the present invention, but in order to by
To the interference for avoiding electric energy in electric line, the transmitter unit 31 is typically chosen frequency and is different from the electric line certainly
The monitoring signals of body electric energy frequency, and the frequency of the signal can not be identical with the frequency for the harmonic wave for endangering the quality of power supply；
Preferably, the frequency of the electric signal can select 300~20000Hz of frequency scope, and this frequency range is real
Apply simple, propagation distance is also distant；The acoustic signals can be ultrasonic signal, and frequency range preferably can be
20000Hz~60000Hz；
In actual use, electric signal is typically chosen as monitoring signals；Relative to acoustic signals, electric signal is easier reality
Apply, use is more extensive.
Further, can be to transmitting a little continual injection monitoring signals in order to recognize disconnection fault in time.
Further, it is described using at least the one of an electric line at least phase line at as transmitting injection monitoring
After signal, the transmitter unit 31 is additionally operable to：
Impedance matching is carried out to the monitoring signals, strengthens the transimission power of the monitoring signals.
The receiver unit 32, for receiving the monitoring signals and determining the transmission ＆ distribution between putting and transmitting a little of collecting mail
The break-make of electric line；
The receiver unit 32 with described can transmit a little corresponding predeterminated position in the electric line, set one
Individual or more than one point of collecting mail receives the monitoring signals；
Specifically, the receiver unit 32 can preset a criterion distance, i.e., described collection of letters point when setting and collecting mail point
With the distance transmitted a little within a preset range.
Further, it will received in the electric line with a little corresponding predeterminated position that transmits as point of collecting mail
Before the monitoring signals, the receiver unit 32 is additionally operable to：
The monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out.The transmission ＆ distribution
The power frequency amount of electric line is the electric power signal that the electric line needs to convey or dispense in itself, without filtering out, not only can
Interference monitoring signal, can also damage receiver unit 32.
When the point of collecting mail receives the monitoring signals in preset time, the receiver unit 32 can determine that institute
Collection of letters point is stated to connect with the circuit between transmitting a little；But, between the collection of letters described in more reliable determination and transmitting a little
Electric line breaks, in addition it is also necessary to comprehensive multiple conditions, specifically：
When the point of collecting mail does not receive the monitoring signals in preset time, and the point of collecting mail is transmitted with described
Point is transmitted the distance between a little within a preset range positioned at same phase line, collection of letters point with described, the receiver unit 32
Circuit between the collection of letters point can be primarily determined that and transmitted a little breaks；
Wherein, regulation, from injection monitoring signals to the time range for receiving monitoring signals, is in order to avoid other signals
Interference or the delay that causes of special broken string situation because the speed of monitoring signals is all quickly, if monitoring signals are used
Electric signal, then speed be similar to the light velocity；If monitoring signals use acoustic signals, speed is also very fast, far super air
In the velocity of sound, if corresponding monitoring signals can not be received in the short time, can be considered as and not receive monitoring signals；
Regulation collect mail point and the distance range transmitted a little, allow for either electric signal or sound wave letter
Number, have very big decay in the air, in order to avoid erroneous judgement, it is necessary to provide it is described collect mail point with it is described transmit a little apart from model
Enclose.
On the basis of the circuit between primarily determining that the collection of letters point and transmitting a little breaks, then confirm transmission and distribution line
Whether the main protection on road acts；If the main protection of the electric line is also not operating, it can determine more reliably that described
The circuit collected mail between putting and transmitting a little breaks；
Because the action of main protection needs connection and the electrical quantity signal of electric line, if broken under circuit light load
And when being not converted into earth fault, then main protection can not be acted.
The protection location 33, for after the electric line between putting and transmitting a little of collecting mail breaks, opening
Move the breaking protection of the electric line.
Specifically, the protection location 33 collects mail point and after the electric line between transmitting a little breaks described,
The breaker that the protection location 33 respectively holds the electric line through being delayed disconnects；
Specifically, it is to export to perform by trip protection that the protection location 33, which disconnects the breaker,.
Described to collect mail point and the electric line between transmitting a little breaks, broken string may drop ground or other
Side, and may also have voltage on the line dropped, there is very big potential safety hazard, therefore, and the protection location 33 is by the power transmission and distribution
The breaker that circuit is respectively held disconnects.
Breaking protection needs circuit respectively to hold to configure, and control protection device needs to send shunt tripping signal to its in addition to local terminal
Its breaking protection, could be realized the breaker disconnection at each end；The control protection device respectively held mutually is communicated.
The purpose that the control protection device disconnects the breaker setting delay that the electric line is respectively held is can to ensure master
Protect the reliable judgement to broken string when being failure to actuate.
Specifically, the time of delay could be arranged to 0.1S~0.4S.
Embodiment three
The embodiment of the present invention is the thread-breakage protecting of transmission line of electricity between transformer station, and circuit is between Liang Ge transformer station
Transmission line of electricity, the frequency of transmission line of electricity itself electric energy is power frequency, i.e., domestic frequency is generally 50Hz；Monitoring signals are high frequency telecommunications
Number, specifically, the frequency of monitoring signals is between 3000~20000Hz.
Fig. 3 is the schematic flow sheet of transmission line of electricity thread-breakage protecting between the transformer station of the embodiment of the present invention three, such as Fig. 3 institutes
Show, methods described includes：
Step 201：Monitoring signals are injected in the first transformer station；
Specifically, monitoring signals are high frequency electrical signal, and the frequency of the electric signal can not be humorous with the harm quality of power supply
The frequency of ripple is identical；
The monitoring signals inject the transmission line of electricity by transceiver, and the transceiver is protected by transmission line of electricity control and filled
Put control；
, can be to the continual injection monitoring signals of transmission line of electricity in order to recognize disconnection fault in time；
Further, impedance matching can also be carried out to the monitoring signals, strengthens the transimission power of the monitoring signals.
Step 202：Monitoring signals are received in the second transformer station；
When receiving the monitoring signals, this step is continued executing with；
When not receiving the monitoring signals, and the collection of letters is put when being a little located at same phase line with transmitting, into step
203。
Step 203：Confirm whether main protection acts；
When the main protection of transmission line of electricity is not operating, determine that the transmission line of electricity between the first transformer station and the second transformer station occurs
Broken string, into step 204；
When the main protection action of transmission line of electricity, flow terminates.
Step 204：Start the breaking protection of transmission line of electricity.
Specifically, control protection device disconnects the breaker at the transmission line of electricity two ends between the first transformer station and the second transformer station.
Example IV
The embodiment of the present invention is the broken yarn protection system of transmission line of electricity between transformer station, and circuit is between Liang Ge transformer station
Transmission line of electricity, the frequency of transmission line of electricity itself electric energy is power frequency, i.e., domestic frequency is generally 50Hz；Monitoring signals are high frequency telecommunications
Number, specifically, the frequency of monitoring signals is between 3000~20000Hz.
Fig. 4 is the composition structural representation of transmission line of electricity broken yarn protection system between the transformer station of the embodiment of the present invention three, such as
Shown in Fig. 4, the transmission line of electricity broken yarn protection system includes transmission line of electricity 51, trap 52, coupled capacitor 53, filter joint
54th, high frequency cable 55, transceiver 56 and broken wire protecting equipment 57；Wherein,
The transmission line of electricity 51, is the transmission line of electricity between Liang Ge transformer stations, is to need to discriminate whether broken string in use
Circuit, while being also used for transmission of monitoring signal；
The trap 52, for limiting propagation of the monitoring signals outside the transmission line of electricity 51, it is ensured that signal intensity,
Also the interference to other circuits is avoided；The trap can be LC shunt-resonant circuits, and LC shunt-resonant circuits are to high frequency
Monitoring signals can produce very big impedance, and there was only the impedance of very little to the electric energy in the transmission line of electricity 51 of rather low-frequency, will not
Influence the conveying of electric energy in transmission line of electricity 51；
The coupled capacitor 53, for preventing the electric energy of itself of transmission line of electricity 51 from entering transceiver, it is to avoid transceiver
Damage；The coupled capacitor 53 can produce very big impedance to the electric energy in the transmission line of electricity 51 of rather low-frequency, and to high frequency
Monitoring signals there was only the impedance of very little, therefore do not influence the transmission of monitoring signals.
The filter joint 54, the power for strengthening monitoring signals；The filter joint 54 includes filter capacitor
And impedance matching capacitances, the filter capacitor coordinates the coupled capacitor 53, for prevent power frequency amount in transmission line of electricity 51 and
Harmonic signal enters transceiver；The impedance matching capacitances are used for the impedance for matching monitoring signals generation, play impedance matching and make
With the power of enhancing monitoring signals；
Specifically, the transceiver 56 serves when transmitting, and the filter joint 54 is first filtered, impedance matching again；
When the transceiver 56 plays the collection of letters, the first impedance matching of the filter joint 54, filter again；
Further, for security consideration, the filter joint 54 can be grounded by grounding switch.
The high frequency cable 55, the monitoring signals for transmitting high frequency, is part of the prior art, does not repeat；
The transceiver 56, for injecting or receiving monitoring signals, and determines that the transmission line of electricity 51 between transformer station is
It is no to break；
Specifically, when the transceiver 56 of near-end does not receive the monitoring of the injection of remote transceiver 56 in preset time
During signal, and near-end main protection it is not operating when, determine between the transceiver 56 of the near-end and remote transceiver 56
Transmission line of electricity 51 breaks；Similarly, when the transceiver 56 of distal end does not receive near-end transceiver 56 in preset time
During the monitoring signals of injection, and distal end main protection it is not operating when, determine that the transceiver 56 of the distal end is received and dispatched with near-end and believe
Transmission line of electricity 51 between machine 56 breaks；
The transceiver 56 is hf transceiver, while having the function of transmitting and collect mail, is typically mounted at power transformation
In the computer room stood, high frequency monitoring signals are transmitted by the high frequency cable 55；
Usually, the transmission line of electricity control protection device of the transceiver 56 and transformer station computer room is mutually communicated.
The broken wire protecting equipment 57, for breaking in the electric line between putting and transmitting a little of collecting mail
Afterwards, transmission line of electricity 51 described in the circuit breaker trip at the two ends of transmission line of electricity 51 is instructed.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
Any modifications, equivalent substitutions and improvements made within the spirit and principles in the present invention etc., should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. a kind of electric line thread-breakage protecting, it is characterised in that methods described includes：
Using at least the one of an electric line at least phase line as transmitting an injection monitoring signals；
In the electric line monitoring signals will be received with a little corresponding predeterminated position that transmits as point of collecting mail；
Do not receive the monitoring signals in the point of collecting mail, and the electric line main protection it is not operating when, determine institute
Electric line between stating collection of letters point and transmitting a little breaks；
After the electric line between putting and transmitting a little of collecting mail breaks, the broken string for starting the electric line is protected
Shield.
2. according to the method described in claim 1, it is characterised in that described by least the one of an electric line at least phase line
Place, which is used as, transmits an injection monitoring signals, including：
Using at least the one of an electric line at least phase line as transmitting an injected frequency different from the electric line
The monitoring signals of itself electric energy frequency.
3. method according to claim 1 or 2, it is characterised in that described by an electric line at least phase line
As after transmitting injection monitoring signals at least one, methods described also includes：
Impedance matching is carried out to the monitoring signals, strengthens the transimission power of the monitoring signals.
4. method according to claim 1 or 2, it is characterised in that it is described by the electric line with the hair
The letter corresponding predeterminated position of point is received as point of collecting mail before the monitoring signals, and methods described also includes：
The monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out.
5. method according to claim 1 or 2, it is characterised in that the breaking protection of the startup electric line,
Including：
After the electric line between putting and transmitting a little of collecting mail breaks, the electric line is disconnected through delay each
The breaker at end.
6. a kind of electric line broken yarn protection system, it is characterised in that the system includes transmitter unit, receiver unit and guarantor
Protect unit；Wherein,
The transmitter unit, for using at least the one of an electric line at least phase line as transmitting an injection monitoring letter
Number；
The receiver unit, for receiving the monitoring signals and determining the electric line between putting and transmitting a little of collecting mail
Break-make；
The protection location, for after the electric line between putting and transmitting a little of collecting mail breaks, starting described
The breaking protection of electric line.
7. system according to claim 6, it is characterised in that the transmitter unit specifically for：
Using at least the one of an electric line at least phase line as transmitting an injected frequency different from the electric line
The monitoring signals of itself electric energy frequency.
8. the system according to claim 6 or 7, it is characterised in that the transmitter unit is additionally operable to：
It is described using at least the one of an electric line at least phase line at as after transmitting injection monitoring signals, to described
Monitoring signals carry out impedance matching, strengthen the transimission power of the monitoring signals.
9. the system according to claim 6 or 7, it is characterised in that the receiver unit is additionally operable to：
The monitoring will be received described as point of collecting mail with a little corresponding predeterminated position that transmits in the electric line
Before signal, the monitoring signals are filtered, the power frequency amount and harmonic signal of the electric line is filtered out.
10. system according to claim 9, it is characterised in that the protection location specifically for：
After the electric line between putting and transmitting a little of collecting mail breaks, the electric line is disconnected through delay each
The breaker at end.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710172797.7A CN107069678B (en) | 2017-03-22 | 2017-03-22 | A kind of electric line thread-breakage protecting and system |
| PCT/CN2017/113063 WO2018171240A1 (en) | 2017-03-22 | 2017-11-27 | Method and system for protection against disconnection of power transmission and distribution lines |
| KR1020197023912A KR102287695B1 (en) | 2017-03-22 | 2017-11-27 | Method and system for protection against disconnection of transmission and distribution lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710172797.7A CN107069678B (en) | 2017-03-22 | 2017-03-22 | A kind of electric line thread-breakage protecting and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107069678A true CN107069678A (en) | 2017-08-18 |
| CN107069678B CN107069678B (en) | 2019-06-21 |
Family
ID=59620877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710172797.7A Active CN107069678B (en) | 2017-03-22 | 2017-03-22 | A kind of electric line thread-breakage protecting and system |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR102287695B1 (en) |
| CN (1) | CN107069678B (en) |
| WO (1) | WO2018171240A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018171240A1 (en) * | 2017-03-22 | 2018-09-27 | 南京南瑞继保电气有限公司 | Method and system for protection against disconnection of power transmission and distribution lines |
| CN109256756A (en) * | 2018-10-23 | 2019-01-22 | 西安交通大学 | The MMC-HVDC to power to passive network exchanges adaptive reclosing method |
| CN109557419A (en) * | 2018-12-13 | 2019-04-02 | 国网山西省电力公司大同供电公司 | A kind of transmission line faultlocating method |
| CN110676826A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| WO2022121887A1 (en) * | 2020-12-09 | 2022-06-16 | 南方电网电力科技股份有限公司 | High-frequency signal-based power consumer relative position identification apparatus, method and device |
| CN116577699A (en) * | 2023-07-13 | 2023-08-11 | 三峡集团浙江能源投资有限公司 | Loss-of-ground monitoring device for small-resistance grounding system of pumped storage power station |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113655338B (en) * | 2021-08-16 | 2023-03-03 | 广东电网有限责任公司 | Positioning device for tripping point of power transmission line |
| CN114640093B (en) * | 2022-02-23 | 2023-03-24 | 北京天能继保电力科技有限公司 | Method and device for protecting broken line of distributed power transmission and distribution line |
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| WO2018171240A1 (en) * | 2017-03-22 | 2018-09-27 | 南京南瑞继保电气有限公司 | Method and system for protection against disconnection of power transmission and distribution lines |
| CN109256756A (en) * | 2018-10-23 | 2019-01-22 | 西安交通大学 | The MMC-HVDC to power to passive network exchanges adaptive reclosing method |
| CN109557419A (en) * | 2018-12-13 | 2019-04-02 | 国网山西省电力公司大同供电公司 | A kind of transmission line faultlocating method |
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| CN110676826A (en) * | 2019-11-28 | 2020-01-10 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| CN110676826B (en) * | 2019-11-28 | 2021-03-23 | 国网江苏省电力有限公司镇江供电分公司 | Line disconnection protection method for comparing vector difference of voltages at two sides of line and application |
| WO2022121887A1 (en) * | 2020-12-09 | 2022-06-16 | 南方电网电力科技股份有限公司 | High-frequency signal-based power consumer relative position identification apparatus, method and device |
| CN116577699A (en) * | 2023-07-13 | 2023-08-11 | 三峡集团浙江能源投资有限公司 | Loss-of-ground monitoring device for small-resistance grounding system of pumped storage power station |
Also Published As
| Publication number | Publication date |
|---|---|
| KR102287695B1 (en) | 2021-08-06 |
| WO2018171240A1 (en) | 2018-09-27 |
| CN107069678B (en) | 2019-06-21 |
| KR20190102081A (en) | 2019-09-02 |
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