CN206161731U - On -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation - Google Patents
On -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation Download PDFInfo
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- CN206161731U CN206161731U CN201621154864.XU CN201621154864U CN206161731U CN 206161731 U CN206161731 U CN 206161731U CN 201621154864 U CN201621154864 U CN 201621154864U CN 206161731 U CN206161731 U CN 206161731U
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Abstract
The utility model relates to an on -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation, it includes line -frequency induction antenna, signal sampling module, digital filter and lock -in amplifier, wherein, the signal output part connection signal sampling module's of line -frequency induction antenna signal input part, signal sampling module's signal output part connect digital filter's signal input part, and digital filter's signal output part connects lock -in amplifier's signal input part, and lock -in amplifier's signal output part connection lock -in amplifier's output signal sampling module 4 feedback is held, the line -frequency induction antenna is arranged in receiving the power frequency signal of gas -insulated transformer substation phase separating charged body. The utility model discloses accurate detection goes out the GIS partial discharge signal in can following strong electromagnetic interference environment.
Description
Technical field
The utility model is related to high voltage electric equipment technical field, and in particular to a kind of gas insulated transformer substation office is placed on line
Monitoring numeral power frequency phase detector.
Background technology
Gas insulated transformer substation (GIS, Gas Insulated Substation) is a kind of reliable, maintenance workload
Little, time between overhauls(TBO) length high voltage electric equipment, frequently with sealed tank body combined electric structure, is filled with certain pressure in tank body
SF6 gases as insulating gas.Under forceful electric power magnetic action, gas insulated transformer substation can occur partial discharge phenomenon, by office
The phenomenons such as portion electricity, light produced when discharging, can position the position of shelf depreciation, and judge the degree discharged.
There is the inspection of pulse current method, gas chromatography and hyperfrequency using wide detection method for local discharge at present
Survey method etc..Wherein, pulse current method and gas chromatography are not easy to on-line checking, and ultra-high-frequency detection method can be to gas
Insulated substations shelf depreciation carries out live detection and on-line monitoring.
When being detected to gas insulated transformer substation shelf depreciation using ultra-high-frequency detection method, floating potentical body electric discharge, absolutely
The electric discharge of edge part internal air gap, creeping discharge and metal tip electric discharge etc., all have certain relevance with operating frequency phase.Accurately obtain
The operating frequency phase signal of gas insulated transformer substation equipment is taken, contributes to reliable detection gas insulated transformer substation shelf depreciation.
At present, gas insulated transformer substation Partial Discharge Detection operating frequency phase is generally taken from the transformer of detection voltage, deposits
In electrical secondary system security hidden trouble, when the transformer of detection voltage is damaged, gas insulated transformer substation shelf depreciation can be affected
Normal work.
Utility model content
The purpose of this utility model is to provide a kind of gas insulated transformer substation office to put on-line monitoring numeral operating frequency phase
Sensor, the sensor can accurately detect GIS partial discharge signal from strong electromagnetic interference environment.
To solve above-mentioned technical problem, on-line monitoring number is put in a kind of gas insulated transformer substation office disclosed in the utility model
Word operating frequency phase sensor, it is characterised in that：It includes line-frequency induction antenna, signal sampling module, digital filter and lock phase
Amplifier, wherein, the signal output part of the line-frequency induction antenna connects the signal input part of signal sampling module, signal sampling
The signal output part of module connects the signal input part of digital filter, and the signal output part connection lock of digital filter mutually amplifies
The signal input part of device, the signal output part of lock-in amplifier connects the output phase signal feedback end of lock-in amplifier, described
Line-frequency induction antenna is used to receive the power frequency component in gas insulated transformer substation split-phase electrical body.
The utility model is devised by line-frequency induction antenna, signal sampling module, digital filter and lock-in amplifier group
Into gas insulated transformer substation office put on-line monitoring numeral power frequency phase detector, the sensor can be to gas insulated transformer substation
Internal shelf depreciation carries out dynamic detection, is accurately positioned, by power frequency component in local discharge signal from strong electromagnetic signal
Accurately detect.Have the advantages that detection speed is fast, strong antijamming capability.
Description of the drawings
Fig. 1 is theory diagram of the present utility model；
Fig. 2 is the theory diagram of lock-in amplifier in the utility model.
Wherein, 1-line-frequency induction antenna, 2-signal sampling module, 2.1-analog-digital converter, 2.2-operational amplifier,
3-digital filter, 4-lock-in amplifier, 4.1-proportional and integral controller, 4.2-multifrequency domain variable integrator.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail：
On-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office of the present utility model, such as Fig. 1 and 2 institutes
Show, it includes line-frequency induction antenna 1, signal sampling module 2, digital filter 3 and lock-in amplifier 4, wherein, the power frequency sense
The signal input part of the signal output part connection signal sampling module 2 of antenna 1, the signal output part of signal sampling module 2 is answered to connect
The signal input part of digital filter 3 is connect, the signal output part of digital filter 3 connects the signal input part of lock-in amplifier 4,
The signal output part of lock-in amplifier 4 connects the output phase signal feedback end of lock-in amplifier 4, the line-frequency induction antenna 1
For receiving the power frequency component that gas insulated transformer substation split-phase electrical body medium frequency is 50HZ.
In above-mentioned technical proposal, the digital filter 3 is complex vector wave filter.The transfer function H of complex vector wave filter
S () is：
Wherein, ωoIt is the power frequency component of the output signal of sampling module 2, ωcFor the cut-off frequency of complex vector wave filter；J is
Empty unit, s is multifrequency domain variable.The complex vector wave filter can extract power frequency component from the signal by strong electromagnetic.It is excellent
Point is the power frequency component ω in the output signal of sampling module 2oPlace, the gain of complex vector wave filter is 1, and correspondence phase shift is 0.
Fig. 2 for lock-in amplifier 4 schematic diagram, VmWith the amplitude and phase place that θ is respectively detected power frequency component, θ '
For the phase signal of the output of lock-in amplifier 4, transmission function G of proportional and integral controller 4.1cS () is：
Wherein, KpIt is the proportionality coefficient of proportional and integral controller 4.1, KiFor the integral coefficient of proportional and integral controller 4.1.
The phase-lock technique can accurately obtain the phase place of detected power frequency component.
In above-mentioned technical proposal, the signal output part of the lock-in amplifier 4 exports the square wave power frequency component of 0～5V.
In above-mentioned technical proposal, digital filter 3 and lock-in amplifier 4 are used for the shelf depreciation of gas insulated transformer substation
The phase place of power frequency component is detected from noise in signal.
In above-mentioned technical proposal, the signal sampling module 2 includes analog-digital converter 2.1 and operational amplifier 2.2, described
The signal output part of line-frequency induction antenna 1 connects the signal input part of analog-digital converter 2.1, and the signal of analog-digital converter 2.1 is defeated
Go out to hold the signal input part of concatenation operation amplifier 2.2, the signal output part connection digital filter 3 of operational amplifier 2.2
Signal input part.
In above-mentioned technical proposal, the lock-in amplifier 4 includes proportional and integral controller 4.1 and multifrequency domain variable integrator
4.2, the signal output part of the digital filter 3 connects the signal input part of proportional and integral controller 4.1, and proportional integral is adjusted
The signal input part of the signal output part connection multifrequency domain variable integrator 4.2 of device 4.1, the letter of multifrequency domain variable integrator 4.2
Number output end connects the output phase signal feedback end of proportional and integral controller 4.1.
Utility model works process is：Line-frequency induction antenna 1 receives gas insulated transformer substation split-phase electrical body medium frequency
For the power frequency component of 50HZ, and analog-to-digital conversion is carried out to it and operation amplifier is processed, the signal after amplification is transported to digital filtering
Device 3, digital filter 3 filters the noise that antenna 1 is received in 50HZ power frequency components, therefrom extracts the power frequency component of 50HZ, number
Word wave filter 3 extracts amplitude V of power frequency componentmAnd phase theta, the phase theta of power frequency component and the phase of the output signal of lock-in amplifier 4
Position θ ' subtracts each other and obtains error signal, and error signal is transferred to proportional and integral controller 4.1 and is processed, proportional and integral controller
The frequency of 4.1 output power frequency components, the frequency of power frequency component is input to multifrequency domain variable integrator 4.2 and is processed, complex frequency domain
Variable integrator 4.2 exports the phase signal θ ' of lock-in amplifier 4, and the phase signal θ ' of lock-in amplifier 4 is this digital working
The phase place of the power frequency component that the detection of frequency phase detector is obtained.
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (6)
1. on-line monitoring numeral power frequency phase detector is put in a kind of gas insulated transformer substation office, it is characterised in that：It includes work
Frequency induction antenna (1), signal sampling module (2), digital filter (3) and lock-in amplifier (4), wherein, the line-frequency induction
The signal input part of signal output part connection signal sampling module (2) of antenna (1), the signal output of signal sampling module (2)
The signal input part at end connection digital filter (3), signal output part connection lock-in amplifier (4) of digital filter (3)
Signal input part, the output phase signal feedback end of signal output part connection lock-in amplifier (4) of lock-in amplifier (4), institute
Power frequency component during line-frequency induction antenna (1) is stated for receiving gas insulated transformer substation split-phase electrical body.
2. on-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office according to claim 1, and it is special
Levy and be：The digital filter (3) is complex vector wave filter.
3. on-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office according to claim 1, and it is special
Levy and be：The signal output part of the lock-in amplifier (4) exports the square wave power frequency component of 0～5V.
4. on-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office according to claim 1, and it is special
Levy and be：The lock-in amplifier (4) includes proportional and integral controller (4.1) and multifrequency domain variable integrator (4.2), the number
The signal input part of signal output part connection proportional and integral controller (4.1) of word wave filter (3), proportional and integral controller
(4.1) signal input part of signal output part connection multifrequency domain variable integrator (4.2), multifrequency domain variable integrator (4.2)
Signal output part connection proportional and integral controller (4.1) output phase signal feedback end.
5. on-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office according to claim 1, and it is special
Levy and be：The signal sampling module (2) includes analog-digital converter (2.1) and operational amplifier (2.2), the line-frequency induction day
The signal input part of signal output part connection analog-digital converter (2.1) of line (1), the signal output part of analog-digital converter (2.1)
The signal input part of concatenation operation amplifier (2.2), signal output part connection digital filter (3) of operational amplifier (2.2)
Signal input part.
6. on-line monitoring numeral power frequency phase detector is put in gas insulated transformer substation office according to claim 1, and it is special
Levy and be：The line-frequency induction antenna (1) for receive gas insulated transformer substation split-phase electrical body medium frequency be 50HZ power frequency
Signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621154864.XU CN206161731U (en) | 2016-10-31 | 2016-10-31 | On -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621154864.XU CN206161731U (en) | 2016-10-31 | 2016-10-31 | On -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation |
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| Publication Number | Publication Date |
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| CN206161731U true CN206161731U (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621154864.XU Active CN206161731U (en) | 2016-10-31 | 2016-10-31 | On -line monitoring is put with digital power frequency phase sensor in office of gas -insulated transformer substation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831412A (en) * | 2017-10-11 | 2018-03-23 | 国网上海市电力公司 | Local discharge of electrical equipment localization method and system, storage medium and terminal device |
-
2016
- 2016-10-31 CN CN201621154864.XU patent/CN206161731U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831412A (en) * | 2017-10-11 | 2018-03-23 | 国网上海市电力公司 | Local discharge of electrical equipment localization method and system, storage medium and terminal device |
| CN107831412B (en) * | 2017-10-11 | 2020-02-21 | 国网上海市电力公司 | Electrical equipment partial discharge positioning method and system, storage medium and terminal equipment |
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