CN105353287A - Partial discharge data acquisition circuit and apparatus - Google Patents

Partial discharge data acquisition circuit and apparatus Download PDF

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Publication number
CN105353287A
CN105353287A CN201510890154.7A CN201510890154A CN105353287A CN 105353287 A CN105353287 A CN 105353287A CN 201510890154 A CN201510890154 A CN 201510890154A CN 105353287 A CN105353287 A CN 105353287A
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CN
China
Prior art keywords
partial discharge
input
voltage
acquisition circuit
signal
Prior art date
Application number
CN201510890154.7A
Other languages
Chinese (zh)
Inventor
张秀宏
龚伟
罗贤峰
但炳木
Original Assignee
重庆臻远电气有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 重庆臻远电气有限公司 filed Critical 重庆臻远电气有限公司
Priority to CN201510890154.7A priority Critical patent/CN105353287A/en
Publication of CN105353287A publication Critical patent/CN105353287A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/14Circuits therefor, e.g. for generating test voltages, sensing circuits

Abstract

The invention provides a partial discharge data acquisition circuit and an apparatus. The partial discharge data acquisition circuit is applied to acquisition of partial discharge signals for inputting to a partial discharge monitoring apparatus. The partial discharge data acquisition circuit comprises an acquisition unit adapted to acquiring voltage power frequency signals; a comparison unit whose input end is connected with the output end of the acquisition unit for converting current signals into voltage signals, comparing the voltage signals with preset reference voltage signals and generating corresponding pulse signals; a preset unit whose output end is connected with the input end of the comparison unit for providing the preset reference voltage signals for the comparison unit; and a protection unit whose input end is connected with the output end of a comparator for restricting amplitude of the pulse signals and outputting partial signals. According to the invention, through arrangement of the protection unit, the amplitude of pulses output by the comparator is restricted, such that the trigger pulse input end of a gatherer is prevented from damage due to coupling of electromagnetic interference to a line. At the same time, in spite of strong outdoor electromagnetic interference, the anti-interference capability of acquisition of power frequency signals is greatly improved through the acquisition circuit.

Description

Partial Discharge Data Acquisition Circuit and device
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 device.
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 device is for realizing the monitoring to the shelf depreciation situation of the device such as GIS, transformer in high pressure power transmission and distribution transformer station.When there is partial discharge phenomenon in device, 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 generating means defect 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 device 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 device, for solve in prior art out of doors monitoring arrangement 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 device, at least comprise:
Collecting unit, is suitable for gathering voltage power frequency component;
Comparing 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, compares with preset reference voltage signal, generates correspondingly pulse signal;
Preset unit, its output terminal is connected with the input end of described comparing unit, and being suitable for provides preset reference voltage signal to described comparing unit;
Protected location, its input end is connected with described comparator output terminal, is suitable for the amplitude of Limited Pulses signal, exports Partial discharge signal.
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 comparing unit comprises comparer and sample resistance; the output terminal of described collecting unit connects the input end of described comparer by described sample resistance, the output terminal of described comparer connects the input end of described protected location, and the output terminal of described protected location exports Partial discharge signal.
Preferably, described protected location 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 comparing unit.
Another object of the present invention is to provide a kind of local discharge detection device adopting Partial Discharge Data Acquisition Circuit.
As mentioned above, Partial Discharge Data Acquisition Circuit of the present invention and device, have following beneficial effect:
By arranging protected location; limit the pulse height that described comparer exports, thus prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector, simultaneously; electromagnetic interference (EMI) strong out of doors, greatly improves the anti-interference energy 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 comparing units
3 preset unit
4 protected locations
R1 ~ R10 resistance
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;
Comparing unit 2, its input end is connected with the output terminal of described collecting unit, is suitable for current signal to be converted to voltage signal, compares with preset reference voltage signal, generates correspondingly pulse signal;
Preset unit 3, its output terminal is connected with the input end of described comparing unit, and being suitable for provides preset reference voltage signal to described comparing unit;
Protected location 4, its input end is connected with described comparator output terminal, is suitable for the amplitude of Limited Pulses signal, exports Partial discharge signal.
In the present embodiment; by arranging protected location; limit the pulse height that described comparer exports; thus prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector; simultaneously; electromagnetic interference (EMI) strong out of doors, greatly improves the anti-interference energy gathering power frequency component by this Acquisition Circuit.
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.
Preset 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 comparing 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 R6, R7, R8, R9, R10 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 comparing unit 2 comprises comparer and sample resistance; the output terminal of described collecting unit 1 connects the input end of described comparer T2 by described sample resistance R5; the output terminal of described comparer T2 connects the input end of described protected location 4, and the output terminal of described protected location 4 exports Partial discharge signal.
Described protected location 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 comparer T2 and the while of presetting; before power frequency square-wave signal input end to carry out the triggering of Partial discharge signal collection to partial discharge collection module; use protected location 4; 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 local discharge detection device adopting Partial Discharge Data Acquisition Circuit.
In sum; the present invention is by arranging protected location; limit the pulse height that described comparer exports; thus prevent from electromagnetic interference (EMI) to be coupled to circuit damages the trigger pulse input end of collector; simultaneously; electromagnetic interference (EMI) strong out of doors, greatly improves the anti-interference energy 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 (6)

1. a Partial Discharge Data Acquisition Circuit, is suitable for gathering Partial discharge signal and is input to partial discharge monitoring device, it is characterized in that, at least comprise:
Collecting unit, is suitable for gathering voltage power frequency component;
Comparing 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, compares with preset reference voltage signal, generates correspondingly pulse signal;
Preset unit, its output terminal is connected with the input end of described comparing unit, and being suitable for provides preset reference voltage signal to described comparing unit;
Protected location, its input end is connected with described comparator output terminal, is suitable for the amplitude of Limited Pulses signal, exports Partial discharge signal.
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; it is characterized in that; described comparing unit comprises comparer and sample resistance; the output terminal of described collecting unit connects the input end of described comparer by described sample resistance; the output terminal of described comparer connects the input end of described protected location, and the output terminal of described protected location exports Partial discharge signal.
4. Partial Discharge Data Acquisition Circuit according to claim 3, is characterized in that, described protected location is two diodes be connected in antiparallel.
5. 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 comparing unit.
6. a partial discharge monitoring device, is characterized in that, comprises the Partial Discharge Data Acquisition Circuit described in above-mentioned any one claim.
CN201510890154.7A 2015-12-04 2015-12-04 Partial discharge data acquisition circuit and apparatus CN105353287A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108172190A (en) * 2018-01-15 2018-06-15 深圳市华星光电技术有限公司 For the amplifying circuit of liquid crystal display
CN109100625A (en) * 2018-10-29 2018-12-28 国网河北省电力有限公司电力科学研究院 A kind of detection circuit for partial discharge and detector
US10514562B2 (en) 2018-01-15 2019-12-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. Amplifier for LCD and LCD

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103487734A (en) * 2013-09-24 2014-01-01 江苏新亚高电压测试设备有限公司 Full-digitalization multi-channel real-time synchronous partial discharge detector
CN204166088U (en) * 2014-10-23 2015-02-18 广州供电局有限公司 Local discharge signal harvester
CN205427119U (en) * 2015-12-04 2016-08-03 重庆臻远电气有限公司 Partial discharge data acquisition circuit and device

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN103487734A (en) * 2013-09-24 2014-01-01 江苏新亚高电压测试设备有限公司 Full-digitalization multi-channel real-time synchronous partial discharge detector
CN204166088U (en) * 2014-10-23 2015-02-18 广州供电局有限公司 Local discharge signal harvester
CN205427119U (en) * 2015-12-04 2016-08-03 重庆臻远电气有限公司 Partial discharge data acquisition circuit and device

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108172190A (en) * 2018-01-15 2018-06-15 深圳市华星光电技术有限公司 For the amplifying circuit of liquid crystal display
US10514562B2 (en) 2018-01-15 2019-12-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. Amplifier for LCD and LCD
CN109100625A (en) * 2018-10-29 2018-12-28 国网河北省电力有限公司电力科学研究院 A kind of detection circuit for partial discharge and detector

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