CN103063993B - Oscillatory wave system and protective relaying type detection impedor and detection impedance protective device - Google Patents
Oscillatory wave system and protective relaying type detection impedor and detection impedance protective device Download PDFInfo
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- CN103063993B CN103063993B CN201210594729.7A CN201210594729A CN103063993B CN 103063993 B CN103063993 B CN 103063993B CN 201210594729 A CN201210594729 A CN 201210594729A CN 103063993 B CN103063993 B CN 103063993B
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 230000003534 oscillatory effect Effects 0.000 title claims abstract description 37
- 230000001681 protective effect Effects 0.000 title abstract 6
- 238000000034 method Methods 0.000 claims description 11
- 239000004065 semiconductor Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 description 10
- 229920003020 cross-linked polyethylene Polymers 0.000 description 5
- 239000004703 cross-linked polyethylene Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention relates to an oscillatory wave system and protective relaying type detection impedor and a detection impedance protective device. The protective relaying type detection impedor comprises a detection impedor, a relay in parallel connection with two ends of the detection impedor, and a drive control device of the relay, wherein the drive control device further comprises a direct current power supply, a first resistor R1, an audion Q, a second resistor R2 and a control unit; a collector of the audion Q is connected with one end where the first resistor R1 is indirectly connected with the direct current power supply; an emitting electrode of the audion Q is connected with a control end of the relay; and the control unit receives signals controlling opening and closing of a high voltage electronic switch in the oscillatory wave system and sends control signals conducted by the relay in a communication mode at the time not later than the time when overshoot voltage reaches to the detection impedor. Due to the fact that a protective relaying type relay is in parallel connection with two ends of the detection impedor, after the high voltage electronic switch is powered on and before the overshoot voltage reaches to the detection impedor, the control unit controls the relay to be combined in an adsorbed mode and conducted in a communication mode, and the fact that no overshoot voltage passes through the detection impedor is ensured.
Description
Technical field
The present invention relates to oscillatory wave system and detect impedance, specifically a kind of oscillatory wave system and relay protection type detect impedance and detect impedance protection.
Background technology
Nearly ten years, extrusion molding power cable particularly crosslinked polyethylene (XLPE) power cable due to its good insulation preformance, be easy to manufacture, the advantage such as easy for installation, power supply safety is reliable, be used widely in urban distribution network.But in the insulation system of this cable often due to the difficulty in process technology or starting material impure and there is air gap and harmfulness impurity, or between insulating medium and semiconductive shielding layer, there is gap due to technological reason or semiconductor is outstanding to insulation course, very easily produce shelf depreciation at these air gaps and impurity tip place, in the middle of the installation and operation process of power cable, also may produce various insulation defect causes shelf depreciation simultaneously.Because the resistance to electric discharges of extrusion molding insulating material such as XLPE are poor, under the long term of shelf depreciation, insulating material is continuous agingly finally causes insulation breakdown, causes a serious accident.Research finds, the partial discharge quantity of cable and its insulation status are closely related, and the change of partial discharge quantity imply that cable insulation may exist the defect of harm cable running safety, therefore assesses the insulation status of cable by the partial discharge quantity of detection streamer.
The detection method of cable local discharge mainly contains following three kinds: 1, under power-frequency voltage, cable local discharge detects; 2, under Ultra-low Frenquency Voltage, cable local discharge detects; 3, under DC Damping oscillating voltage, cable local discharge detects; Method 1 wherein, because the electric capacity of power cable is large, is difficult to carry out at the scene the Partial Discharge Detection under power-frequency voltage; Method 2 wherein requires that test period is long, comparatively large to cable insulation damage, can cause the new defect in cable; Method 3 wherein, because the insulation resistance of XLPE power cable is higher, and voltage's distribiuting difference is larger under AC and DC, after carrying out DC voltage withstand test, in XLPE cable, particularly electric cable stoppage place can remain a large amount of space charge, and after cable puts into operation, these space charges often cause the dielectric breakdown accident of cable.Therefore said method is not all suitable for the Partial Discharge Detection to extrusion molding power cable.
Wave of oscillation test macro (OWTS, English full name is Oscillating Waveform Test System), utilize the series resonance principal of cable equivalent capacitance and inductance insulated conductor, make oscillating voltage electric cable stoppage place in repeatedly reversal process inspire local discharge signal, measure this signal by high-frequency coupler thus judge the quality of cable.OWTS wave of oscillation cable local discharge detection and positioning technology is adopted to test 10kV distribution cable, can Timeliness coverage and location latency shelf depreciation defect and can not damage cable, greatly can improve power supply reliability.Chinese patent literature CN102565637A discloses a kind of cable oscillatory wave partial discharge detection system measured based on asynchronous double-end, specifically shown in Figure 1, this system comprises cable under test and the wave of oscillation generating means be connected with cable under test respectively and signals collecting subsystem, program control wide journey shelf depreciation prover, host computer.Wherein, wave of oscillation generating means produces damp oscillatory wave under the control of host computer, the waveform collected and data are transferred to upper computer analyzing software to focus on, are analyzed by the signals collecting subsystem at cable two ends, obtain the judgement with or without shelf depreciation generation and partial discharge quantity, thus realize the test of cable local discharge.
The collection of high-voltage signal needs to be distributed by impedance to realize, high-tension overshoot can be produced instantaneously in high-pressure electronic switch motion, realize impedance that dividing potential drop detects also there will be voltage transient and increases according to the impedance ratio fixedly designed, if do not taked corresponding measure, too high potential pulse can damage the signal acquiring system of low pressure.For solving the problem, usually by less for the impedance ratio setting detecting impedance in prior art, even if occur that voltage overshoot also can not damage or puncture low-voltage signal acquisition and processing system like this, but because local discharge signal is inherently relative to the ultra-weak electronic signal under voltage levels, now detecting the voltage signal that impedance distributes relatively can be less, directly has influence on the sensitivity of detection.
Summary of the invention
For this reason, to be solved by this invention is that detection impedance of the prior art arranges the too high technical matters that easily the damaged sensitivity arranging too low detection is low, provides a kind of oscillatory wave system relay protection type to detect impedance.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Meanwhile, provide a kind of oscillatory wave system relay protection type to detect impedance, comprising:
Detect impedance;
Relay, is connected in parallel on described detection impedance two ends;
The driving control device of relay, it comprises further:
Direct supply;
First resistance R1, one end of described first resistance R1 is connected with the output terminal of direct supply;
The base stage of triode Q, described triode Q is connected with the second resistance R2, the termination control module that the second resistance R2 is not directly connected with described base stage; One end that collector and the described first resistance R1 of described triode Q are not directly connected with direct supply is connected; The emitter of described triode Q is connected with the control end of described relay;
Control module, receives the signal controlling oscillatory wave system mesohigh electronic switch closes, and sends the described relay of control in the control signal being not later than conducting when overshoot voltage arrives described detection impedance.
Described relay is PhotoMOS relay.
Described PhotoMOS relay comprises further:
Infrarede emitting diode, its positive pole is connected with the emitter of described triode Q, the minus earth of described infrarede emitting diode;
Photodiode array, receives the photovoltage of the infrared light generation driven MOS pipe that described infrarede emitting diode sends;
Metal-oxide-semiconductor, receive described photodiode array produce photovoltage, and the voltage rise between its grid and source electrode to threshold voltage time, pilot relay conducting or shutoff.
Described PhotoMOS relay be ON time be less than or equal to 0.1ms and conducting moment maximum current be the PhotoMOS relay of 30A.
A kind of oscillatory wave system, with detecting impedance protection, comprising:
Relay, is connected in parallel in oscillatory wave system the two ends detecting impedance during use;
The driving control device of relay, it comprises further:
Direct supply;
First resistance R1, one end of described first resistance R1 is connected with the output terminal of direct supply;
The base stage of triode Q, described triode Q is connected with the second resistance R2, the termination control module that the second resistance R2 is not directly connected with described base stage; One end that collector and the described first resistance R1 of described triode Q are not directly connected with direct supply is connected; The emitter of described triode Q is connected with the control end of described relay;
Control module, receives the signal controlling oscillatory wave system mesohigh electronic switch closes, and sends the described relay of control in the control signal being not later than conducting when overshoot voltage arrives described detection impedance.
Described relay is PhotoMOS relay.
Described PhotoMOS relay comprises further
Infrarede emitting diode, its positive pole is connected with the emitter of described triode Q, the minus earth of described infrarede emitting diode;
Photodiode array, receives the photovoltage of the infrared light generation driven MOS pipe that described infrarede emitting diode sends;
Metal-oxide-semiconductor, receive described photodiode array produce photovoltage, and the voltage rise between its grid and source electrode to threshold voltage time, pilot relay conducting or shutoff.
Described PhotoMOS relay be ON time be less than or equal to 0.1ms and conducting moment maximum current be the PhotoMOS relay of 30A.
Meanwhile, a kind of oscillatory wave system is also provided, comprises:
Cable under test;
Oscillator generating means, is connected in series with described cable under test;
Signal acquiring system, input end is connected between described oscillator generating means and described cable under test, flows through the voltage signal of described cable under test and export described in collection;
Industrial computer, receives the described voltage signal of described signal pickup assembly output and processes;
Detection impedance in described signal acquiring system uses above-mentioned oscillatory wave system relay protection type to detect impedance.
Technique scheme of the present invention has the following advantages compared to existing technology:
Described oscillatory wave system relay protection type of the present invention detects impedance; by detecting an impedance two ends relay protection type relay in parallel; after high-pressure electronic switch opens; before overshoot arrives described detection impedance; control module controls described relay adhesive conducting; ensure described detection impedance is passed through without overshoot voltage, protection detection impedance and the low-voltage signal acquisition system be connected with detection impedance are damaged from overshoot voltage, ensure that it normally works.
Described oscillatory wave system relay protection type of the present invention detects impedance, adopts PhotoMOS relay and the driving be mated and control circuit, ensures that relay realizes the function of high-speed switch.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is a kind of cable oscillatory wave partial discharge detection system structural drawing measured based on asynchronous double-end disclosed in Chinese patent literature CN102565637A;
Fig. 2 is that the wave of oscillation relay protection type of one embodiment of the invention detects impedance structure schematic diagram;
Fig. 3 is oscillatory wave system mesohigh electronic switch control signal, the working timing figure that situation, PhotoMOS relay control signal and PhotoMOS relay open situation opened by high-pressure electronic switch.
Embodiment
A kind of oscillatory wave system, comprising: cable under test; The oscillator generating means be connected in series with described cable under test; Signal acquiring system, input end is connected between described oscillator generating means and described cable under test, flows through the voltage signal of described cable under test and export described in collection; Industrial computer, receives the described voltage signal of described signal pickup assembly output and processes; As a kind of embodiment of the present invention, detection resistance in described signals collecting is that a kind of oscillatory wave system relay protection type shown in Fig. 2 detects impedance, and described oscillatory wave system relay protection type detects impedance and comprises: detect impedance and be connected in parallel on the detection impedance protection at described detection impedance two ends;
Described detection impedance protection comprises further:
Relay, is connected in parallel on described detection impedance two ends;
The driving control device of relay, it comprises further:
Direct supply;
First resistance R1, one end of described first resistance R1 is connected with the output terminal of direct supply;
The base stage of triode Q, described triode Q is connected with the second resistance R2, the termination control module that the second resistance R2 is not directly connected with described base stage; One end that collector and the described first resistance R1 of described triode Q are not directly connected with direct supply is connected; The emitter of described triode Q is connected with the control end of described relay;
Control module, receives the signal controlling oscillatory wave system mesohigh electronic switch closes, and sends the described relay of control in the control signal being not later than conducting when overshoot voltage arrives described detection impedance.
As the embodiment of above-described embodiment, described relay is PhotoMOS relay, and described PhotoMOS relay comprises further:
Infrarede emitting diode, its positive pole is connected with the emitter of described triode Q, the minus earth of described infrarede emitting diode;
Photodiode array, receives the photovoltage of the infrared light generation driven MOS pipe that described infrarede emitting diode sends;
Metal-oxide-semiconductor, receive described photodiode array produce photovoltage, and the voltage rise between its grid and source electrode to threshold voltage time, pilot relay conducting or shutoff.
As embodiment, described PhotoMOS relay be ON time be less than or equal to 0.1ms and conducting moment maximum current be the PhotoMOS relay of 30A.
As a kind of embodiment of the present invention, described high-pressure electronic switch controlling signal, high-pressure electronic switch open situation, PhotoMOS relay control signal and PhotoMOS relay, and to open the working timing figure of situation shown in Figure 3, when the base stage of described triode Q is high level, triode Q conducting, Vcc forms loop through the first resistance R1, the inner infrarede emitting diode of relay, light-emitting diodes is bright, photodiode array converts light to electric signal, control metal-oxide-semiconductor conducting, show as relay " adhesive ", namely light MOS solid-state relay switch closes.
Expand stream by triode Q and indirectly control the open-minded of light MOS solid-state relay, the base stage of triode Q only needs microampere order electric current just can control triode Q to work, and can reach to be convenient to control, to drive convenient and can accelerate more greatly service time and the efficiency of relay due to collector current.Can calculate being eliminated control signal to when by described control module as the time delays caused after adding the discrete devices such as triode Q.
As the distortion of above-described embodiment; described PhotoMOS relay can be PhotoMOS relay or other relay of the prior art replacement of other structure of the prior art; as long as the controlled conducting before overshoot voltage arrives of energy; all can realize object of the present invention, belong to protection scope of the present invention.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (9)
1. oscillatory wave system relay protection type detects an impedance, it is characterized in that, comprising:
Detect impedance;
Relay, is connected in parallel on described detection impedance two ends;
The driving control device of relay, it comprises further: direct supply;
First resistance R1, one end of described first resistance R1 is connected with the output terminal of direct supply;
The base stage of triode Q, described triode Q is connected with the second resistance R2, the termination control module that the second resistance R2 is not directly connected with described base stage; One end that collector and the described first resistance R1 of described triode Q are not directly connected with direct supply is connected; The emitter of described triode Q is connected with the control end of described relay;
Control module, receives the signal controlling oscillatory wave system mesohigh electronic switch closes, and sends the described relay of control in the control signal being not later than conducting when overshoot voltage arrives described detection impedance.
2. a kind of oscillatory wave system relay protection type according to claim 1 detects impedance, and it is characterized in that, described relay is PhotoMOS relay.
3. a kind of oscillatory wave system relay protection type according to claim 2 detects impedance, and it is characterized in that, described PhotoMOS relay comprises further:
Infrarede emitting diode, its positive pole is connected with the emitter of described triode Q, the minus earth of described infrarede emitting diode;
Photodiode array, receives the infrared light that described infrarede emitting diode sends, and produces the photovoltage of driven MOS pipe;
Metal-oxide-semiconductor, receive described photodiode array produce photovoltage, and the voltage rise between its grid and source electrode to threshold voltage time, pilot relay conducting or shutoff.
4. a kind of oscillatory wave system relay protection type according to claim 3 detects impedance, it is characterized in that, described PhotoMOS relay is that ON time is less than or equal to 0.1ms and conducting moment maximum current is the PhotoMOS relay of 30A.
5. oscillatory wave system is with detecting an impedance protection, it is characterized in that, comprising:
Relay, is connected in parallel in oscillatory wave system the two ends detecting impedance during use;
The driving control device of relay, it comprises further:
Direct supply;
First resistance R1, one end of described first resistance R15 is connected with the output terminal of direct supply;
The base stage of triode Q, described triode Q is connected with the second resistance R2, the termination control module that the second resistance R2 is not directly connected with described base stage; One end that collector and the described first resistance R1 of described triode Q are not directly connected with direct supply is connected; The emitter of described triode Q is connected with the control end of described relay;
Control module, receives the signal controlling oscillatory wave system mesohigh electronic switch closes, and sends the described relay of control in the control signal being not later than conducting when overshoot voltage arrives described detection impedance.
6. a kind of oscillatory wave system according to claim 5 detects impedance protection, and it is characterized in that, described relay is PhotoMOS relay.
7. a kind of oscillatory wave system according to claim 6 detects impedance protection, and it is characterized in that, described PhotoMOS relay comprises further:
Infrarede emitting diode, its positive pole is connected with the emitter of described triode Q, the minus earth of described infrarede emitting diode;
Photodiode array, receives the photovoltage of the infrared light generation driven MOS pipe that described infrarede emitting diode sends;
Metal-oxide-semiconductor, receive described photodiode array produce photovoltage, and the voltage rise between its grid and source electrode to threshold voltage time, pilot relay conducting or shutoff.
8. a kind of oscillatory wave system according to claim 7 detects impedance protection, it is characterized in that, described PhotoMOS relay is that ON time is less than or equal to 0.1ms and conducting moment maximum current is the PhotoMOS relay of 30A.
9. an oscillatory wave system, comprising:
Cable under test;
Oscillator generating means, is connected in series with described cable under test;
Signal acquiring system, input end is connected between described oscillator generating means and described cable under test, gathers the voltage signal on described cable under test and exports;
Industrial computer, receives the described voltage signal of described signal acquiring system output and processes;
It is characterized in that, the oscillatory wave system relay protection type as described in the detection impedance use in described signal acquiring system is as arbitrary in claim 1-4 detects impedance.
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| CN201210594729.7A CN103063993B (en) | 2012-12-31 | 2012-12-31 | Oscillatory wave system and protective relaying type detection impedor and detection impedance protective device |
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| CN201210594729.7A CN103063993B (en) | 2012-12-31 | 2012-12-31 | Oscillatory wave system and protective relaying type detection impedor and detection impedance protective device |
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| CN103063993B true CN103063993B (en) | 2015-05-20 |
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| CN110196390A (en) * | 2019-06-28 | 2019-09-03 | 深圳市元征科技股份有限公司 | A kind of detection method and its relevant apparatus of circuit |
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2012
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| CN2670163Y (en) * | 2003-12-23 | 2005-01-12 | 比亚迪股份有限公司 | Power battery safety alarming device of electric vehicle |
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Inventor after: Shi Xiang Inventor after: Zhao Shengchuan Inventor after: Chen Zhiyong Inventor after: Jiang Chuan Inventor after: Cui Xiao Inventor after: Pan Bin Inventor after: Liu Shubo Inventor after: Zhang Hongwei Inventor after: Chen Yongping Inventor before: Shi Xiang Inventor before: Zhao Shengchuan Inventor before: Chen Zhiyong Inventor before: Jiang Chuan Inventor before: Cui Xiao Inventor before: Liu Shubo Inventor before: Zhang Hongwei Inventor before: Chen Yongping |
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