CN207663016U - Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system - Google Patents
Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system Download PDFInfo
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- CN207663016U CN207663016U CN201721791401.9U CN201721791401U CN207663016U CN 207663016 U CN207663016 U CN 207663016U CN 201721791401 U CN201721791401 U CN 201721791401U CN 207663016 U CN207663016 U CN 207663016U
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Abstract
The utility model discloses alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring systems, including it includes DC current sensor, AC current sensor, voltage signal acquisition module, signal analysis and display terminal；This on-line detecting system by using AC filter and breaker divide-shut brake coil electric current and breaker CT electric currents, enroll its waveform, think that subsequent analysis calculates the branch wire time of breaker, the alternate combined floodgate of the breaker not time same period, the alternate separating brake of the breaker not time same period, pass through the branch wire time to breaker, the alternate combined floodgate of the breaker not time same period, the all previous analysis comparison of the time same period does not provide important basis to the alternate separating brake of breaker, pass through analyses and comparison, it can judge the operating mechanism performance of breaker and the insulation performance of breaker, foundation is provided for circuit-breaker status maintenance.
Description
Technical field
The utility model is related to technical field of electric power, and in particular to a kind of alternating current filter high-voltage circuit-breaker switching on-off time
On-line monitoring system.
Background technology
In D.C. high voltage transmission；In engineering system, alternating current filter is the essential equipment of high voltage DC engineering, in order to
Switching alternating current filter, is mounted with AC filter and breaker, since alternating current filter needs frequently during DC load adjusts
Switching, breaker can operate 2-4 times in 1 day, and number of operations is more than 500-600 times in 1 year, the operation time of breaker
The more, the probability of failure is bigger for number.There is prodigious necessity to the on-line checking of AC filter and breaker.
In existing high voltage direct current transmission project system, the dash current during switching in order to reduce alternating current filter
And switching overvoltage, the equipment in effective protection alternating current filter, in AC filter and breaker control loop, installation is resolved
Road device entering-phase control device, entering-phase control device are closed a floodgate when can control breaker closing in the zero crossing of system voltage,
Dash current when alternating current filter input is reduced, separating brake is in 90 ° of position (alternating current filters of system voltage when breaker open operation
Current zero-crossing point), reduce the switching overvoltage of alternating current filter.As shown in Figs. 1-2, in this breaker division operating status
Under, breaker closes a floodgate in the zero crossing of system voltage every time, and the electric current of alternating current filter is specified, and breaker is each
Arc time when combined floodgate is identical；The each separating brake of breaker is in 90 ° of position (i.e. electric currents of alternating current filter of system voltage
Zero crossing), and the electric current of alternating current filter is specified, and arc time when each separating brake of breaker is relative constant.
The branch wire time of high-voltage circuitbreaker is an important content of breaker on-line monitoring, and weighs breaker shape
One important indicator of state is as follows in relation to parameter definition：
Closing time：Until all pole contacts all Contacts for being connected to reclosing command moment and playing breaker when
Between；
Opening time：Time until the pole contact all times of releasing for being connected to separating brake order instant and playing breaker；
It is alternate to close a floodgate the not time same period：Difference between breaker three-phase closing time maximum value and minimum value, as phase
Between close a floodgate the not time same period；
The alternate separating brake not time same period：Difference between breaker three-phase opening time maximum value and minimum value, as phase
Between separating brake not the same period when；
Close the time：Time until electric current time instances occurs in breaker is played from reclosing command moment is connected to；
Switch off time：From the time being connected to until separating brake order instant plays breaker no current time instances；
Arc time：There is the time of electric arc in arc-extinguishing chamber of circuit breaker.
Invention content
The purpose of the utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of alternating current filter high pressure open circuit
Device branch wire time on-line monitoring system finds failure in time to weigh the state of breaker.
To achieve the above object, the technical solution of the utility model is：
Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system, including DC current sensor, alternating current
Flow sensor, voltage signal acquisition module and signal analysis and display terminal；Wherein,
The DC current sensor, is used to detect the current signal of circuit-breaker switching on-off coil, and exports corresponding
Voltage signal；
The AC current sensor is used to detect the secondary side current signal of current transformer in breaker circuit,
And defeated corresponding voltage signal；
The voltage signal acquisition module, input terminal respectively with DC current sensor and AC current sensor phase
Connection, for acquire the DC current sensor and AC current sensor output voltage signal, and to voltage signal into
Row filtering and amplification, and export the voltage signal after conditioning；
The signal analysis and display terminal, are connected with the output end of the voltage signal acquisition module, for connecing
The current waveform signal of the signal extraction module transfer is received, and shows that the branch wire time of monitoring breaker and breaker are alternate
The not time same period.
Compared with prior art, advantage is the utility model：
This on-line detecting system by using AC filter and breaker divide-shut brake coil electric current and breaker CT electric currents,
Its waveform is enrolled, to calculate the alternate combined floodgate of the branch wire time of breaker, the breaker not time same period, disconnected for subsequent analysis
The alternate separating brake of the road device not time same period, by the alternate combined floodgate of branch wire time, breaker to breaker not the time same period,
The all previous analysis comparison of the time same period does not provide important basis to the alternate separating brake of breaker, passes through analyses and comparison, you can judge
The operating mechanism performance of breaker and the insulation performance of breaker provide foundation for circuit-breaker status maintenance.
Description of the drawings
Fig. 1 is breaker circuit breaker current, breaker closing coil current, breaker closing time, the time of closing, arcing
Time time diagram；
Fig. 2 is breaker circuit breaker current, breaker open operation coil current, breaker open operation time, switch off time, arcing
Time time diagram；
Fig. 3 is the alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system that the utility model embodiment provides
Composition schematic diagram；
In figure：1, DC current sensor；2, AC current sensor；3, voltage signal acquisition module；4, signal is analyzed
And display terminal.
Specific implementation mode
The content of the utility model is described in further details with reference to the accompanying drawings and detailed description.
Embodiment：
As shown in fig.3, for alternating current filter high-voltage circuit-breaker switching on-off time provided in this embodiment on-line monitoring system
The composition schematic diagram of system, the system include DC current sensor 1, AC current sensor 2, voltage signal acquisition module 3, letter
Number analysis and display terminal 4；In the present embodiment, since voltage signal acquisition module 3 and signal analysis and display terminal 4 are adopted
Therefore voltage signal acquisition module 3 and signal analysis are just no longer specifically described in the present embodiment and is shown with prior art products
Show the specific configuration and operation principle of terminal 4.
Wherein, for this system during practical application, DC current sensor 1 is for measuring circuit-breaker switching on-off coil
Electric current, and export corresponding voltage signal；AC current sensor 2 is for measuring breaker threephase current transformer secondary returning
The electric current on road, and export corresponding voltage signal；Voltage signal acquisition module 3 is for acquiring the DC current sensor 1 and handing over
The voltage signal that galvanic electricity flow sensor 2 is exported, and the voltage signal is filtered and is amplified, and export conditioned electricity
Press signal；Signal is analyzed and display terminal 4, is connected with the voltage signal acquisition module 3, for receiving the signal extraction
The current waveform signal (voltage is shown in the form of current waveform) of module transfer, and show the branch wire time of monitoring breaker
The not time same period alternate with breaker.
This on-line detecting system by using AC filter and breaker divide-shut brake coil electric current and breaker CT electric currents,
Its waveform is enrolled, to calculate the alternate combined floodgate of the branch wire time of breaker, the breaker not time same period, disconnected for subsequent analysis
The alternate separating brake of the road device not time same period, by the alternate combined floodgate of branch wire time, breaker to breaker not the time same period,
The all previous analysis comparison of the time same period does not provide important basis to the alternate separating brake of breaker, passes through analyses and comparison, you can judge
The operating mechanism performance of breaker and the insulation performance of breaker provide foundation for circuit-breaker status maintenance.
Specifically, analysis calculates alternate combined floodgate not the time same period, the breaker of the branch wire time of breaker, breaker
The process of the alternate separating brake not time same period be：
(1) the electric current moment is used as the three-phase that divide-shut brake coil charges by the breaker three-phase separate closing coil of admission
Separating brake order initial time TfqA, TfqB, TfqC and three-phase combined floodgate order initial time ThqA, ThqB, ThqC.
(2) by the alternating current filter high-voltage circuitbreaker three-phase CT electric currents of admission, by the breaker CT no current moment and have
The electric current moment as breaker three-phase cut-off moment TfkA ˊ, TfkB ˊ, TfkC ˊ and breaker three-phase on-off time ThgA ˊ,
ThgBˊ、ThgCˊ。
(3) separating brake order initial time TfqA, TfqB, the TfqC and breaker three-phase for calculating separately breaker three-phase are cut-off
Moment TfkA ˊ, TfkB ˊ, TfkC ˊ time difference to get to three-phase switch off time TfkA, TfkB, TfkC of breaker.
(4) combined floodgate order initial time ThqA, ThqB, ThqC of breaker three-phase are calculated separately；It is related to breaker three
Conjunction ThgA ˊ, ThgB ˊ, ThgC ˊ time difference to get to switch off time ThgA, ThgB, ThgC of breaker three-phase.
(5) calculating analysis is carried out by the waveform for the circuit breaker current enrolled to the circuit-breaker switching on-off moment, obtains open circuit
Arc time TfrA, TfrB, TfrC and ThrA, ThrB, the ThrC at the divide-shut brake moment of device.
(6) arc time calculates when breaker open operation：Emphasis acquires this period until breaker interrupting process is completed
Three-phase current recording signal, to the signal using three times low-pass filter filtering after carry out data fitting, predict thereafter
Then curent change situation finds out contact compared with actual current and begins to divide time point.
Assuming that being the period from separating brake order to circuit breaker current, per mutually having N number of sampled data, least square method is used
Data fitting is carried out to this N number of data, analytic expression is：
In formula, Q represents the extreme value of entire expression formula；K representative sample moment, value k=1,2 ..., N；ykIt represents practical
Recording current sampling data；xkThe representative sample moment；aiIt is to be evaluated.
Determining coefficient aiIt afterwards, can be by p per phase in the time after being cut-off completely from separating brake order to breaker
Predicted value, which is found out, to be come.Then predicted value and actual value are wanted to subtract and ask its absolute value, p distortion magnitude can be found out：
Δij=| I'j-Ij|
In formula, I'jFor predicted value, IjFor measured value, j values are N+1, N+2 ..., N+p.When m-th of distortion magnitude is more than
Threshold value δ, i.e. Δ im＞ δ, it is believed that this point is contact beginning branch, that is, separating brake moment.The separating brake moment has been found out, can have been obtained
Arc time.
(7) arc time calculates when breaker closing：There is electric current (arcing initial time) in three-phase in the acquisition of combined floodgate emphasis
The three-phase current recording signal of this period, determines that principle is similar to opening time until the 30ms after so far, different
That combined floodgate matched curve is carried forward from rear end, prediction under normal circumstances before electric current initiating events, then with actual current
It compares at the time of find out dynamic and static contact, that is, closing moment.Closing moment is found, when also can be obtained by combined floodgate
Between.
Assuming that from three-phase there is electric current after 20ms to the 30ms periods, per mutually have N number of sampled data, use minimum two
Multiplication carries out data fitting to this N number of data, and analytic expression is：
In formula, Q represents the extreme value of entire expression formula；K representative sample moment, value k=1,2 ..., N；ykIt represents practical
Recording current sampling data；xkThe representative sample moment；aiIt is to be evaluated.
Determining coefficient aiIt afterwards, can be by p per phase in the time after being cut-off completely from separating brake order to breaker
Predicted value, which is found out, to be come.Then predicted value and actual value are wanted to subtract and ask its absolute value, p distortion magnitude can be found out：
Δij=| I'j-Ij|
In formula, I'jFor predicted value, IjFor measured value, j values are N-1, N-2 ..., N-p.When m-th of distortion magnitude is more than
Threshold value δ, i.e. Δ im＞ δ, it is believed that this point is contact beginning chalaza, that is, closing moment.Closing moment has been found out, can have been obtained
Closing time.
(8) calculate separately breaker three-phase switch off time TfkA, TfkB, TfkC and three-phase breaker open operation when combustion
The time difference of arc time TfrA, TfrB, TfrC are to get to three-phase opening time TfA, TfB, TfC of breaker；
(9) combustion when breaker closing for closing time ThkA, ThkB, ThkC and three-phase of breaker three-phase is calculated separately
The time difference of arc time ThrA, ThrB, ThrC are to get to three-phase closing time ThA, ThB, ThC of breaker；
(10) time difference of three-phase opening time TfA, TfB, TfC maximum value and minimum value of breaker is taken, it is as breaking
Device three-phase separating brake different times phase Tfb；Or take three-phase switch off time TfkA, TfkB, TfkC maximum value and minimum value of breaker
Time difference, as breaker three-phase separating brake different time phase Tfb；
(11) time difference of three-phase closing time ThA, ThB, ThC maximum value and minimum value of breaker is taken, it is as breaking
The different time phase Thb of device three-phase combined floodgate；Or the three-phase of breaker is taken to close time ThkA, ThkB, ThkC maximum value and minimum value
Time difference, as breaker three-phase closes a floodgate different time phase Thb.
Above-described embodiment simply to illustrate that the utility model technical concepts and features, the purpose is to be to allow this field
Interior those of ordinary skill can understand the content of the utility model and implement according to this, can not limit the utility model with this
Protection domain.The equivalent changes or modifications that every essence according to the utility model content is made, should all cover in this reality
With in novel protection domain.
Claims (1)
1. alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system, which is characterized in that the system comprises direct currents
Current sensor, AC current sensor, voltage signal acquisition module and signal analysis and display terminal；Wherein,
The DC current sensor, is used to detect the current signal of circuit-breaker switching on-off coil, and exports corresponding voltage
Signal；
The AC current sensor is used to detect the secondary side current signal of current transformer in breaker circuit, and defeated
Go out corresponding voltage signal；
The voltage signal acquisition module, input terminal are connected with DC current sensor and AC current sensor respectively
It connects, the voltage signal for acquiring the DC current sensor and AC current sensor output, and voltage signal is carried out
Filtering and amplification, and export the voltage signal after conditioning；
The signal analysis and display terminal, are connected with the output end of the voltage signal acquisition module, for receiving
The current waveform signal of signal extraction module transfer is stated, and shows the branch wire time of monitoring breaker and the alternate difference of breaker
Time phase.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721791401.9U CN207663016U (en) | 2017-12-20 | 2017-12-20 | Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721791401.9U CN207663016U (en) | 2017-12-20 | 2017-12-20 | Alternating current filter high-voltage circuit-breaker switching on-off time on-line monitoring system |
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| CN207663016U true CN207663016U (en) | 2018-07-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729699A (en) * | 2019-10-21 | 2020-01-24 | 南方电网科学研究院有限责任公司 | Method and device for calculating switching-off capacitive load overvoltage of filter circuit breaker |
| CN112230106A (en) * | 2020-09-25 | 2021-01-15 | 江苏核电有限公司 | Detection device and method for switch external local switching-on/off controller |
| CN113067410A (en) * | 2021-03-29 | 2021-07-02 | 山东山大电力技术股份有限公司 | Online diagnosis and analysis system and method for alternating current filter circuit breaker |
-
2017
- 2017-12-20 CN CN201721791401.9U patent/CN207663016U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729699A (en) * | 2019-10-21 | 2020-01-24 | 南方电网科学研究院有限责任公司 | Method and device for calculating switching-off capacitive load overvoltage of filter circuit breaker |
| CN110729699B (en) * | 2019-10-21 | 2021-11-05 | 南方电网科学研究院有限责任公司 | Method and device for calculating switching-off capacitive load overvoltage of filter circuit breaker |
| CN112230106A (en) * | 2020-09-25 | 2021-01-15 | 江苏核电有限公司 | Detection device and method for switch external local switching-on/off controller |
| CN113067410A (en) * | 2021-03-29 | 2021-07-02 | 山东山大电力技术股份有限公司 | Online diagnosis and analysis system and method for alternating current filter circuit breaker |
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