CN105319490A - Partial discharge data acquisition circuit and equipment - Google Patents
Partial discharge data acquisition circuit and equipment Download PDFInfo
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- CN105319490A CN105319490A CN201510890120.8A CN201510890120A CN105319490A CN 105319490 A CN105319490 A CN 105319490A CN 201510890120 A CN201510890120 A CN 201510890120A CN 105319490 A CN105319490 A CN 105319490A
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Abstract
The invention provides a partial discharge data acquisition circuit and partial discharge data acquisition equipment, and is suitable for acquiring a partial discharge signal and inputting the signal to partial discharge monitoring equipment. The partial discharge data acquisition circuit comprises an acquisition unit suitable for acquiring a voltage power frequency signal, and performing electrical isolation on the voltage power frequency signal, to generate a corresponding current signal, a conversion processing unit, and a preset unit, wherein the input end of the conversion processing unit is connected with the output end of the acquisition unit, and the conversion processing unit is used for converting the current signal into a voltage signal, comparing the voltage signal with a preset reference voltage signal, generating a corresponding pulse signal, performing filtering and amplitude limiting on the pulse signal in sequence, and outputting a corresponding partial discharge signal; the output end of the preset unit is connected with the input end of the conversion processing unit, and the preset unit is used for providing a preset reference voltage signal for the conversion processing unit. Under outdoor strong electromagnetic interference, the acquisition circuit greatly improves the interference resistance to the acquisition of the power frequency signal.
Description
Technical field
The invention belongs to power cable insulation detection field, particularly relate to one and be applied to high-frequency local discharging data acquisition circuit and equipment.
Background technology
In recent years, a large amount of employing power cable power transmission and distribution in urban distribution network.Cable has become the leading products of transferring electric power in city.Due to the insulating material characteristic of cable, the reason such as manufacturing process, operating technique of cable causes producing various insulation defect in the middle of the operational process of power cable and causes shelf depreciation.After it uses certain time limit, shelf depreciation continues to develop into and to a certain degree causes insulation breakdown and cause electrical network major accident.Thus the research of crosslinking polyethylene-insulated cable insulation defect detection method for local discharge is just seemed particularly urgent, in time, cable insulation hidden danger is detected exactly, just can take necessary counter-measure in time, the economic loss that minimizing burst accident etc. brings is of great practical significance.
Shelf depreciation, abbreviation office puts, and be the operating larger potential safety hazard of power cable, being the sign of cable insulation deterioration, is also one of major reason causing insulation degradation.Therefore carry out the research of local discharge signal detection and positioning to power cable to have great significance and economic worth.Relevant local discharge signal testing standard has all been formulated in IEC and countries in the world, by the weak link in the detection Timeliness coverage insulation system of local discharge signal, finds out failure cause, ensures power cable quality, ensure power system security reliability service.
Existing high-frequency local discharging monitoring equipment is for realizing the monitoring to the shelf depreciation situation of the equipment such as GIS, transformer in high pressure power transmission and distribution transformer station.When there is partial discharge phenomenon in equipment, ultrahigh-frequency signal can be produced, the detection of sensor is put by office, high-frequency signal is carried out analog to digital conversion and analytic operation, in Partial discharge signal collecting unit, the discharge pulse signal collected is superimposed on the operating frequency phase of detection line, obtains corresponding office and put impulse phase collection of illustrative plates, put generation equipment deficiency kind to analyze the office of causing.Therefore, it is very crucial for gathering power frequency component, but existing large-scale substation basic setup out of doors, causes monitoring equipment to be also positioned in open air, inevitably there is electromagnetic interference (EMI), result in the instability gathering power frequency component.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of Partial Discharge Data Acquisition Circuit and equipment, for solve in prior art out of doors surveillance equipment time, because there is electromagnetic interference (EMI), cause the problem gathering power frequency component instability.
For achieving the above object and other relevant objects, the invention provides a kind of Partial Discharge Data Acquisition Circuit, be suitable for gathering Partial discharge signal and be input to partial discharge monitoring equipment, at least comprise:
Collecting unit, is suitable for gathering voltage power frequency component, described voltage power frequency component is carried out electrical isolation, generates current signal accordingly;
Conversion processing unit, its input end is connected with the output terminal of described collecting unit, is suitable for current signal to be converted to voltage signal, compare with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly;
Preset unit, its output terminal is connected with the input end of described conversion processing unit, and being suitable for provides preset reference voltage signal to described conversion processing unit.
Preferably, described collecting unit comprises voltage transformer (VT) and sampling resistor, and described sampling resistor connects described voltage transformer (VT), and described sampling resistor is suitable for rated voltage to be converted to current signal, exports described voltage transformer (VT) to.
Preferably, described sampling resistor is the resistance that four resistances are 100K ohm.
Preferably, described voltage transformer (VT) is connected to the intermediate ends of four resistance.
Preferably; described conversion processing unit comprises the first filtering circuit, the second filtering circuit, comparer, protection circuit and sample resistance; the output terminal of described collecting unit connects the input end of described first filtering circuit by described sample resistance; the output terminal of described first filtering circuit connects the input end of described comparer; the output terminal of described comparer connects described second filtering circuit input end; described second filtering circuit output terminal connects the input end of described protection circuit, and the output terminal of described protection circuit exports Partial discharge signal.
Preferably, described first filtering circuit and described second filtering circuit are RC wave filter.
Preferably, described protection circuit is two diodes be connected in antiparallel.
Preferably, described default unit comprises voltage follower and operational amplifier, and the output terminal of described voltage follower connects described opamp input terminal, and the output terminal of described operational amplifier connects the input end of described conversion processing unit.
Another object of the present invention is to provide a kind of partial discharge monitoring equipment adopting Partial Discharge Data Acquisition Circuit.
As mentioned above, Partial Discharge Data Acquisition Circuit of the present invention and equipment, have following beneficial effect:
By the voltage power frequency component of collection is carried out electrical isolation, generate the current signal of sampling, improve effective anti-electromagnetic interference capability; The current signal of sampling is compared with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly, carry out pulse height restriction by diode, effectively prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector.Partial discharge monitoring equipment is arranged on out of doors, is greatly improved the antijamming capability gathering power frequency component by this Acquisition Circuit.
Accompanying drawing explanation
Fig. 1 is shown as Partial Discharge Data Acquisition Circuit structured flowchart of the present invention;
Fig. 2 is shown as the circuit diagram of Partial Discharge Data Acquisition Circuit of the present invention.
Element numbers illustrates:
1 collecting unit
2 conversion processing units
3 preset unit
R1 ~ R12 resistance
C1 ~ C2 electric capacity
D1 ~ D2 diode
D3 schottky diode
T1 operational amplifier
T2 comparer
TV1 mutual induction of voltage
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.It should be noted that, when not conflicting, the feature in following examples and embodiment can combine mutually.
It should be noted that, the diagram provided in following examples only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
Referring to Fig. 1, for the invention provides a kind of Partial Discharge Data Acquisition Circuit structured flowchart, comprising:
Collecting unit 1, is suitable for gathering voltage power frequency component, described voltage power frequency component is carried out electrical isolation, generates current signal accordingly;
Conversion processing unit 2, its input end is connected with the output terminal of described collecting unit 1, is suitable for current signal to be converted to voltage signal, compare with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly;
Preset unit 3, its output terminal is connected with the input end of described conversion processing unit 2, and being suitable for provides preset reference voltage signal to described conversion processing unit 2.
In the present embodiment, by the voltage power frequency component of collection is carried out electrical isolation, generate the current signal of sampling, improve effective anti-electromagnetic interference capability; The current signal of sampling is compared with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly, carry out pulse height restriction by diode, effectively prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector.
As shown in Figure 2, for the invention provides a kind of circuit diagram of Partial Discharge Data Acquisition Circuit, specific as follows:
Described collecting unit 1 comprises voltage transformer (VT) and sampling resistor, and described sampling resistor connects described voltage transformer (VT), and described sampling resistor is suitable for rated voltage to be converted to current signal, exports described voltage transformer (VT) to.
Described sampling resistor is the resistance that four resistances are 100K ohm, by these four resistance R1 ~ R4 that connect, can 220V voltage signal be converted to small area analysis signal, input to voltage transformer (VT) TV1, wherein, large resistance of connecting adds input impedance, for the high tension voltage mutual inductance that front end connects, reduce bearing power, when larger resistance not only can reduce thunderbolt, surge impact is for the impact of back-end circuit.
Described voltage transformer (VT) TV1 is connected to the intermediate ends of four resistance, by internal electrical magnetic induction, front end current signal is converted to back end current signal and is used for collection signal, from but realize electrical isolation, effectively add the interference of electromagnetic pulse-resisting.
State default unit 3 and comprise voltage follower and operational amplifier T1, the output terminal of described voltage follower connects described opamp input terminal, and the output terminal of described operational amplifier connects the input end of described conversion processing unit 2.
In the present embodiment, the chip of described voltage follower is the voltage that TL431 chip produces is 1.5V voltage reference, wherein, resistance R8, R9, R10, R11, R12 and schottky diode D3 form voltage follower, the voltage follower consisted of discharge circuit adds its driving force, improves the reference voltage of signal.
Described conversion processing unit 2 comprises the first filtering circuit, the second filtering circuit, comparer T2, protection circuit and sample resistance; the output terminal of described collecting unit 1 connects the input end of described first filtering circuit by described sample resistance R5; the output terminal of described first filtering circuit connects the input end of described comparer; the output terminal of described comparer connects described second filtering circuit input end; described second filtering circuit output terminal connects the input end of described protection circuit, and the output terminal of described protection circuit exports Partial discharge signal.
Described first filtering circuit and described second filtering circuit are RC wave filter.
Described protection circuit is two diode D1 and D2 be connected in antiparallel.
In the present embodiment, described current signal is converted to voltage signal by sample resistance R5, by this voltage signal by the first filtering circuit (RC wave filter) filtering, wherein, comprise the 6th resistance R6 and become RC wave filter with the first capacitance group C1, by voltage (sine wave) signal of conversion compared with predeterminated voltage, export square-wave signal; By this square-wave signal by the second filtering circuit (RC wave filter) filtering, namely the low-pass filter that forms of the 7th resistance R7 and the second electric capacity C2, carries out filtering to the square wave inputted, and the 7th resistance R7 also current limiting effect; Avoid when short trouble appears in rear end, can not damage comparison device output terminal; Simultaneously; before power frequency square-wave signal input end to carry out the triggering of Partial discharge signal collection to partial discharge collection module, use protection circuit, namely two diodes D1, D2 carry out pulse amplitude restriction; to prevent electromagnetic interference (EMI) to be coupled on circuit, thus damage the trigger pulse input end of collector.
The present invention also comprises the partial discharge monitoring equipment adopting Partial Discharge Data Acquisition Circuit.
In sum, the present invention, by the voltage power frequency component of collection is carried out electrical isolation, generates the current signal of sampling, improves effective anti-electromagnetic interference capability; The current signal of sampling is compared with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly, carry out pulse height restriction by diode, effectively prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector.Partial discharge monitoring equipment is arranged on out of doors, is greatly improved the antijamming capability gathering power frequency component by this Acquisition Circuit.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (9)
1. a Partial Discharge Data Acquisition Circuit, is suitable for gathering Partial discharge signal and is input to partial discharge monitoring equipment, it is characterized in that, at least comprise:
Collecting unit, is suitable for gathering voltage power frequency component, described voltage power frequency component is carried out electrical isolation, generates current signal accordingly;
Conversion processing unit, its input end is connected with the output terminal of described collecting unit, is suitable for current signal to be converted to voltage signal, compare with preset reference voltage signal, generate correspondingly pulse signal, by described pulse signal successively filtering, amplitude limiting processing, export Partial discharge signal accordingly;
Preset unit, its output terminal is connected with the input end of described conversion processing unit, and being suitable for provides preset reference voltage signal to described conversion processing unit.
2. Partial Discharge Data Acquisition Circuit according to claim 1, it is characterized in that, described collecting unit comprises voltage transformer (VT) and sampling resistor, described sampling resistor connects described voltage transformer (VT), described sampling resistor is suitable for rated voltage to be converted to current signal, exports described voltage transformer (VT) to.
3. Partial Discharge Data Acquisition Circuit according to claim 2, is characterized in that, described sampling resistor is the resistance that four resistances are 100K ohm.
4. Partial Discharge Data Acquisition Circuit according to claim 3, is characterized in that, described voltage transformer (VT) is connected to the intermediate ends of four resistance.
5. Partial Discharge Data Acquisition Circuit according to claim 1, it is characterized in that, described conversion processing unit comprises the first filtering circuit, second filtering circuit, comparer, protection circuit and sample resistance, the output terminal of described collecting unit connects the input end of described first filtering circuit by described sample resistance, the output terminal of described first filtering circuit connects the input end of described comparer, the output terminal of described comparer connects described second filtering circuit input end, described second filtering circuit output terminal connects the input end of described protection circuit, the output terminal of described protection circuit exports Partial discharge signal.
6. Partial Discharge Data Acquisition Circuit according to claim 5, is characterized in that, described first filtering circuit and described second filtering circuit are RC wave filter.
7. Partial Discharge Data Acquisition Circuit according to claim 5, is characterized in that, described protection circuit is two diodes be connected in antiparallel.
8. Partial Discharge Data Acquisition Circuit according to claim 1, it is characterized in that, described default unit comprises voltage follower and operational amplifier, the output terminal of described voltage follower connects described opamp input terminal, and the output terminal of described operational amplifier connects the input end of described conversion processing unit.
9. a partial discharge monitoring equipment, is characterized in that, comprises the Partial Discharge Data Acquisition Circuit described in above-mentioned any one claim.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510890120.8A CN105319490A (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and equipment |
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| CN201510890120.8A CN105319490A (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and equipment |
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| CN105319490A true CN105319490A (en) | 2016-02-10 |
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| CN201510890120.8A Pending CN105319490A (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112615412A (en) * | 2020-12-24 | 2021-04-06 | 东风本田汽车有限公司 | Charging protection circuit of electric automobile |
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| CN204166088U (en) * | 2014-10-23 | 2015-02-18 | 广州供电局有限公司 | Local discharge signal harvester |
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| CN102435922A (en) * | 2011-10-26 | 2012-05-02 | 上海交通大学 | Acoustic-electric combined detection system and positioning method for GIS (Gas Insulated Switchgear) local discharge |
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