CN205176204U - Partial discharge data acquisition circuit and monitoring system - Google Patents
Partial discharge data acquisition circuit and monitoring system Download PDFInfo
- Publication number
- CN205176204U CN205176204U CN201521003952.5U CN201521003952U CN205176204U CN 205176204 U CN205176204 U CN 205176204U CN 201521003952 U CN201521003952 U CN 201521003952U CN 205176204 U CN205176204 U CN 205176204U
- Authority
- CN
- China
- Prior art keywords
- partial discharge
- signal
- voltage
- data acquisition
- acquisition circuit
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The utility model provides a partial discharge data acquisition circuit and monitoring system is suitable for the collection office to put signal input to partial discharge monitoring system, include: the sampling resistor is suitable for and gathers voltage power frequency signal, voltage transformer, be suitable for with voltage power frequency signal carries out the electric isolation, and the ground current signal is answered to the generating pair, comparing element, it is voltage signal to be suitable for electric current signal conversion, and predetermines benchmark voltage signal and relatively, generates correspondingly pulse signal, predetermine the unit, its output with comparing element's input links to each other, be suitable for to comparing element provides and predetermines reference voltage signal. At the strong electromagnetic interference in open air, keep apart current signals preceding, the back both ends through this voltage transformer to realize the electric isolation, greatly improved the interference killing feature of gathering power frequency signal.
Description
Technical field
The utility model belongs to power cable insulation detection field, particularly relates to one and is applied to high-frequency local discharging data acquisition circuit and monitoring system.
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 system 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 system to be also positioned in open air, inevitably there is electromagnetic interference (EMI), result in the instability gathering power frequency component.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of Partial Discharge Data Acquisition Circuit and monitoring system, for to 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 utility model provides a kind of Partial Discharge Data Acquisition Circuit, is suitable for gathering Partial discharge signal and is input to partial discharge monitoring system, at least comprise:
Sampling resistor, is suitable for gathering voltage power frequency component;
Voltage transformer (VT), is suitable for described voltage power frequency component to carry out electrical isolation, generates current signal accordingly;
Comparing unit, is suitable for current signal to be converted to voltage signal, compares with preset reference voltage signal, generate 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.
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 comparing unit comprises comparer and sample resistance, and the output terminal of described voltage transformer (VT) connects the input end of described comparer by described sample resistance, the output terminal output pulse signal of described comparer.
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 utility model is to provide a kind of partial discharge monitoring system adopting Partial Discharge Data Acquisition Circuit.
As mentioned above, Partial Discharge Data Acquisition Circuit of the present utility model and monitoring system, have following beneficial effect:
By adopting super large resistance to gather, reduce bearing power by this super large resistance, when can reduce thunderbolt, surge impact is for the impact of back-end circuit; The voltage power frequency component of collection is carried out electrical isolation, realizes electrical isolation, avoid forward and backward two ends electromagnetic interference (EMI), improve effective anti-electromagnetic interference capability; Partial discharge monitoring system 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 utility model;
Fig. 2 is shown as the circuit diagram of Partial Discharge Data Acquisition Circuit of the present utility model.
Element numbers illustrates:
1 collecting unit
2 comparing units
3 preset unit
R1 ~ R10 resistance
D1 schottky diode
T1 operational amplifier
T2 comparer
TV1 mutual induction of voltage
Embodiment
Below by way of specific instantiation, embodiment of the present utility model is described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present utility model and effect easily.The utility model 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 utility model.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 utility model in a schematic way, then only the assembly relevant with the utility model 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.
Refer to Fig. 1, for the utility model provides a kind of Partial Discharge Data Acquisition Circuit structured flowchart, comprising:
Sampling resistor 1, is suitable for gathering voltage power frequency component;
Voltage transformer (VT) 2, is suitable for described voltage power frequency component to carry out electrical isolation, generates current signal accordingly;
Comparing unit 3, is suitable for current signal to be converted to voltage signal, compares with preset reference voltage signal, generate correspondingly pulse signal;
Preset unit 4, 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.
In the present embodiment, by adopting super large resistance to gather, reduce bearing power by this super large resistance, when can reduce thunderbolt, surge impact is for the impact of back-end circuit; The voltage power frequency component of collection is carried out electrical isolation, realizes electrical isolation, avoid forward and backward two ends electromagnetic interference (EMI), improve effective anti-electromagnetic interference capability; Partial discharge monitoring system is arranged on out of doors, is greatly improved the antijamming capability gathering power frequency component by this Acquisition Circuit.
As shown in Figure 2, for the utility model provides a kind of circuit diagram of Partial Discharge Data Acquisition Circuit, specific as follows:
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) (voltage transformer (VT) 2 as in Fig. 1) 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.
Default unit comprises voltage follower and operational amplifier T1, 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.
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, R8,9, R10 and schottky diode D3 forms 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 T2 and sample resistance, the output terminal of described voltage transformer (VT) TV1 connects the input end of described comparer by described sample resistance R5, wherein, the output terminal of sample resistance R5 parallel connection and this voltage transformer (VT) TV1, current signal is converted to voltage signal, the output terminal output pulse signal of described comparer.
In the present embodiment, described current signal is converted to voltage signal by sample resistance R5, by voltage (sine wave) signal of conversion compared with predeterminated voltage, exports square-wave signal; Meanwhile, carry out the triggering of Partial discharge signal collection to partial discharge collection module at power frequency square-wave signal input end.
The utility model also comprises the partial discharge monitoring system adopting Partial Discharge Data Acquisition Circuit.
In sum, by adopting super large resistance to gather, reduce bearing power by this super large resistance, when can reduce thunderbolt, surge impact is for the impact of back-end circuit; The voltage power frequency component of collection is carried out electrical isolation, realizes electrical isolation, avoid forward and backward two ends electromagnetic interference (EMI), improve effective anti-electromagnetic interference capability; Partial discharge monitoring system is arranged on out of doors, is greatly improved the antijamming capability gathering power frequency component by this Acquisition Circuit.So the utility model effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
Claims (6)
1. a Partial Discharge Data Acquisition Circuit, is suitable for gathering Partial discharge signal and is input to partial discharge monitoring system, it is characterized in that, at least comprise:
Sampling resistor, is suitable for gathering voltage power frequency component;
Voltage transformer (VT), is suitable for described voltage power frequency component to carry out electrical isolation, generates current signal accordingly;
Comparing unit, is suitable for current signal to be converted to voltage signal, compares with preset reference voltage signal, generate 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.
2. Partial Discharge Data Acquisition Circuit according to claim 1, is characterized in that, described sampling resistor is the resistance that four resistances are 100K ohm.
3. Partial Discharge Data Acquisition Circuit according to claim 2, is characterized in that, described voltage transformer (VT) is connected to the intermediate ends of four resistance.
4. Partial Discharge Data Acquisition Circuit according to claim 1, it is characterized in that, described comparing unit comprises comparer and sample resistance, and the output terminal of described voltage transformer (VT) connects the input end of described comparer by described sample resistance, the output terminal output pulse signal of described comparer.
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 system, is characterized in that, comprises the Partial Discharge Data Acquisition Circuit described in above-mentioned any one claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521003952.5U CN205176204U (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521003952.5U CN205176204U (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205176204U true CN205176204U (en) | 2016-04-20 |
Family
ID=55740180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521003952.5U Expired - Fee Related CN205176204U (en) | 2015-12-04 | 2015-12-04 | Partial discharge data acquisition circuit and monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205176204U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548829A (en) * | 2015-12-04 | 2016-05-04 | 重庆臻远电气有限公司 | Partial discharge data acquisition circuit and partial discharge monitoring system |
-
2015
- 2015-12-04 CN CN201521003952.5U patent/CN205176204U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548829A (en) * | 2015-12-04 | 2016-05-04 | 重庆臻远电气有限公司 | Partial discharge data acquisition circuit and partial discharge monitoring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9615270B2 (en) | Intelligent power utilization communication product detecting system | |
| CN105527549A (en) | Partial discharge data collection circuit and detection system | |
| CN103323751B (en) | A kind of high pressure stub cable insulation terminal local discharge test device and using method | |
| CN103944607B (en) | Low-voltage powerline carrier communication signal supervisory instrument | |
| CN203572909U (en) | Single-phase ground fault detection circuit and system | |
| CN204945316U (en) | The harvester of live detection electromagnetic interference (EMI) is put in office of transformer station | |
| CN202486278U (en) | Power distribution network cable insulation detection system | |
| CN201302591Y (en) | Over-voltage online monitoring device | |
| CN205229398U (en) | Partial discharge data acquisition circuit and detecting system | |
| CN205176208U (en) | Partial discharge data acquisition circuit and monitoring facilities | |
| CN205176207U (en) | Partial discharge data acquisition circuit and equipment | |
| CN105353287A (en) | Partial discharge data acquisition circuit and apparatus | |
| CN205176204U (en) | Partial discharge data acquisition circuit and monitoring system | |
| CN105092946A (en) | Three-phase circuit overvoltage monitoring system | |
| CN105334443A (en) | Partial discharge data collecting circuit and monitoring equipment | |
| CN105092947B (en) | A kind of over-voltage monitoring system and method for three-phase circuit | |
| CN204405728U (en) | A kind of arrester discharge counter | |
| CN205427119U (en) | Partial discharge data acquisition circuit and device | |
| CN105425126A (en) | Separation method for multiple partial discharge sources and conditioning device for three frequency centers | |
| CN203224561U (en) | Online monitoring device for transient overvoltage of power distribution network | |
| CN205210242U (en) | Wireless partial discharge signal pickup assembly | |
| CN202383244U (en) | Partial discharge detection device of gas insulated switchgear | |
| CN105319490A (en) | Partial discharge data acquisition circuit and equipment | |
| CN211402529U (en) | Data acquisition device for transformer core multipoint grounding on-line monitoring | |
| CN205231739U (en) | A filtering system for electric wire netting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20171204 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |