CN103412172A - Multi-channel leakage current measurement system and measurement method - Google Patents
Multi-channel leakage current measurement system and measurement method Download PDFInfo
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- CN103412172A CN103412172A CN2013102965940A CN201310296594A CN103412172A CN 103412172 A CN103412172 A CN 103412172A CN 2013102965940 A CN2013102965940 A CN 2013102965940A CN 201310296594 A CN201310296594 A CN 201310296594A CN 103412172 A CN103412172 A CN 103412172A
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Abstract
The invention discloses a multi-channel leakage current measurement system and a multi-channel leakage current measurement method. The multi-channel leakage current measurement system comprises an industrial personal computer, a loop selector and a measurement unit; the industrial personal computer provides control signals of loop selection for the loop selector; the loop selector receives the control signals transmitted by the industrial personal computer, and connects gated loops to be measured into the measurement unit and makes un-gated loops grounded, wherein the gated loops to be measured are subjected to leakage current measurement; and the measurement unit transmits measurement results to the industrial personal computer. With the measurement method adopted, multi-channel leakage current measurement can be realized with a single measurement system adopted, namely, loops to be measured are selected circularly through the control signals, and the loops to be measured are connected into a measurement loop such that the loops to be measured can be measured; and loops not to be measured are grounded reliably. The multi-channel leakage current measurement system and measurement method of the invention can satisfy the requirements of high-voltage experiments in which multiple channels of leakage current is measured simultaneously and intensively and occasions in which leakage current of multiple channels of equipment is acquired simultaneously when the equipment is intensively arranged.
Description
Technical field
The invention belongs to high voltage external insulation field, particularly a kind of measuring method of leakage current.
Background technology
In modern industry control and scientific research, often need process or system are comprehensively shown and observe.The leakage current measurement system is as on-line monitoring mode important in high pressure external insulation field, and application is very extensive in scientific research and production practices.
In traditional Leakage Current measuring system, for long-time continuous, record waveform and the various eigenwert of leakage current, common a set of current collecting device can only tracking measurement one road leakage current.Many production scenes ，Ru transformer station, all be provided with a plurality of leakage currents monitoring point usually; In the scientific research test, as in the accelerated aging test device and in the creepage trace device, many group test test products all are set simultaneously usually, in order to monitor the leakage current of each test product in experimentation, need to arrange harvester corresponding to many groups.There is great wasting of resources phenomenon in above-mentioned measurement mechanism one to one, also exists wiring too much simultaneously, the shortcomings that waits difficult in maintenance.
Summary of the invention
The invention discloses a kind of multichannel leakage current measuring method.The method is used single measuring system to realize the purpose of multichannel leakage current measurement, and implementation method is for to choose circularly loop to be measured by control signal, and it is accessed in measuring circuit and measure; Other loop reliable grounds.The measuring method designed in the present invention is applicable to concentrating simultaneously the high-potting of measuring the multichannel leakage current, and equipment is intensive gathers simultaneously the occasion of multichannel equipment leakage current while arranging.
The technical scheme that the present invention takes is:
A kind of multichannel leakage current measurement system, is characterized in that: comprise industrial computer, circuit selector, measuring unit;
Described industrial computer provides the control signal of loop choice for circuit selector;
Described circuit selector is accepted the control signal that industrial computer sends, and the loop to be measured of gating is linked in described measuring unit and carries out leakage current measurement, not the loop ground connection of gating;
Described measuring unit transfers to measurement result in described industrial computer.
Described circuit selector comprises a plurality of structural units, the measurement of the corresponding loop leakage electric current to be measured of each structural unit;
In each structural unit, comprise and loop-coupled input end IN to be measured, the measuring junction ME be communicated with described measuring unit and earth terminal GND,
This structural unit is not selected during as measuring circuit, and its input end IN is connected with ground section GND;
After this structural unit received control signal, its input end IN and earth terminal GND disconnected, and access simultaneously measuring junction ME.
Between the link circuit two-way of the link circuit of input end IN and earth terminal GND and input end IN and measuring junction ME, interlock.
For N road leakage current measurement, the sampling time on each road is t, and the interlock time between measuring-signal is τ, measures cycle period T and is:
T=N(t+τ)。
The leakage current sampling rate of measuring unit: > 5kHz, sampling precision: 16 precision; Measuring unit stake resistance R≤0.5k Ω.
A kind of multichannel leakage current measuring method is characterized in that: comprise following steps:
The control signal of loop choice is provided for circuit selector by industrial computer;
Described circuit selector is accepted the control signal that industrial computer sends, and the loop to be measured of gating is linked in measuring unit and carries out leakage current measurement;
Described measuring unit transfers to measurement result in described industrial computer;
Wherein, described circuit selector comprises a plurality of structural units, the measurement of the corresponding loop leakage electric current to be measured of each structural unit; In each structural unit, comprise and loop-coupled input end IN to be measured, the measuring junction ME be communicated with described measuring unit and earth terminal GND,
This structural unit is not selected during as measuring circuit, and its input end IN is connected with ground section GND;
After this structural unit received control signal, its input end IN and earth terminal GND disconnected, and access simultaneously measuring junction ME.
When gating i road, during as measuring circuit, provide and measure instruction Ci by industrial computer, export circuit selector to; Under steering order Ci, leakage current to be measured loop, i road and earth terminal GND disconnect, and access simultaneously measuring junction ME loop; After the Measuring Time that duration is t, i road and measuring junction ME loop disconnect, and are connected with earth terminal GND loop; After overprotection duration τ, this measurement to the i road finishes.
From this measurement to the i road, finish, to next time, the time that the measurement on i road starts to experience is to (N-1) (t+ τ), the cycle period of measurement is T=N (t+ τ).
For N road leakage current measurement, the sampling time on each road is t, and the interlock time between measuring-signal is τ, measures cycle period T and is:
T=N(t+τ)。
The beneficial effect that the present invention reaches:
For some long continuous monitoring occasions, do not need continuous recording leakage current waveform, only need to obtain the development trend of leakage current in a period of time, therefore can adopt the mode of time-sharing multiplex: adopt a set of measuring system, a plurality of time periods will be divided into its service time, each time period selects a road measured signal to be measured, and the gating time section on measurement result Zai Gai road is transmitted, and other the loop be not strobed is at this period reliable ground.
The present invention adopts time-sharing multiplexing technology to set up multichannel leakage current measurement system, and the results of running shows: acquisition system can be good at meeting scientific research and moves the requirement of producing the signal transmission measurement; Through rational parameter designing, can greatly improve the utilization factor of equipment, the optimization system structure, reduce system wiring.By adopting suitable wiring construction, can realize the quick-replaceable of circuit of measurement and control, easy maintenance is easily gone.
The accompanying drawing explanation
Fig. 1 is multichannel leakage current circulation measuring system composition diagram;
Fig. 2 is circuit selector structural unit composition diagram;
Fig. 3 is the control flow chart of multichannel leakage current measurement system.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.Following examples are only for technical scheme of the present invention more clearly is described, and can not limit the scope of the invention with this.
1. the composition of measuring system
Measuring system is comprised of industrial computer, circuit selector, measuring system etc., as shown in Figure 1.
Industrial computer provides the control signal of loop choice, accepts the measurement result data;
Circuit selector is accepted the industrial computer control signal, the loop of gating is linked in measuring circuit, not the loop reliable ground of gating;
Measuring system is accepted the measured signal of circuit selector output, after measuring, exports measurement result, and result is transferred to industrial computer.
2. the circuit selector structural unit forms
For N road leakage current measurement, coordinate and be provided with N structural unit in circuit selector.The composition of each structural unit as shown in Figure 2.
During as measuring circuit, input end IN reliably is not connected with ground section GND selected;
After receiving the selection signal, input end IN and earth terminal GND disconnect, and access simultaneously measuring junction ME;
Between the link circuit two-way of the link circuit of input end IN and earth terminal GND and input end IN and measuring junction ME, realize interlocking by physical construction, interference-free to guarantee measurement.
3. the control method of loop choice
For N road leakage current measurement, the sampling time on each road requires as t, and cycle period is T, and the interlock time between measuring-signal is τ, and the relation between can be expressed as:
T=N(t+τ)
As shown in figures 1 and 3,, provide and measure instruction Ci by industrial computer during as measuring circuit when gating i road, export circuit selector to; Under steering order Ci, leakage current to be measured loop, i road and earth terminal GND disconnect, and access simultaneously measuring junction ME loop; After the Measuring Time that duration is t, i road and measuring junction ME loop disconnect, and are connected with earth terminal GND loop; After overprotection duration τ, this measurement to the i road finishes.
From this measurement to the i road, finish to start to need the time of experiencing to be (N-1) (t+ τ) to the measurement of next time to the i road, the cycle period of measurement is T=N (t+ τ).
4. the requirement of measuring system
Measuring system only namely meets the measurement of multichannel leakage current by a set of equipment, its performance need meet some requirements.The general requirement as the leakage current sampling rate: > 5kHz, sampling precision: 16 precision.
The measuring system stake resistance is R, requires R≤0.5k Ω.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and distortion, these improvement and distortion also should be considered as protection scope of the present invention.
Claims (9)
1. a multichannel leakage current measurement system, is characterized in that: comprise industrial computer, circuit selector, measuring unit;
Described industrial computer provides the control signal of loop choice for circuit selector;
Described circuit selector is accepted the control signal that industrial computer sends, and the loop to be measured of gating is linked in described measuring unit and carries out leakage current measurement, not the loop ground connection of gating;
Described measuring unit transfers to measurement result in described industrial computer.
2. multichannel leakage current measurement system according to claim 1, it is characterized in that: described circuit selector comprises a plurality of structural units, the measurement of the corresponding loop leakage electric current to be measured of each structural unit;
In each structural unit, comprise and loop-coupled input end IN to be measured, the measuring junction ME be communicated with described measuring unit and earth terminal GND,
This structural unit is not selected during as measuring circuit, and its input end IN is connected with ground section GND;
After this structural unit received control signal, its input end IN and earth terminal GND disconnected, and access simultaneously measuring junction ME.
3. multichannel leakage current measurement system according to claim 2, is characterized in that: interlock between the link circuit two-way of the link circuit of input end IN and earth terminal GND and input end IN and measuring junction ME.
4. multichannel leakage current measurement system according to claim 3, it is characterized in that: for N road leakage current measurement, the sampling time on each road is t, the interlock time between measuring-signal is τ, measures cycle period T to be:
T=N(t+τ)。
5. multichannel leakage current measurement system according to claim 1 is characterized in that: the leakage current sampling rate of measuring unit: > 5kHz, sampling precision: 16 precision; Measuring unit stake resistance R≤0.5k Ω.
6. multichannel leakage current measuring method is characterized in that: comprise following steps:
The control signal of loop choice is provided for circuit selector by industrial computer;
Described circuit selector is accepted the control signal that industrial computer sends, and the loop to be measured of gating is linked in measuring unit and carries out leakage current measurement;
Described measuring unit transfers to measurement result in described industrial computer;
Wherein, described circuit selector comprises a plurality of structural units, the measurement of the corresponding loop leakage electric current to be measured of each structural unit; In each structural unit, comprise and loop-coupled input end IN to be measured, the measuring junction ME be communicated with described measuring unit and earth terminal GND,
This structural unit is not selected during as measuring circuit, and its input end IN is connected with ground section GND;
After this structural unit received control signal, its input end IN and earth terminal GND disconnected, and access simultaneously measuring junction ME.
7. multichannel leakage current measuring method according to claim 6 is characterized in that: when gating i road, during as measuring circuit, provided and measured instruction Ci by industrial computer, export circuit selector to; Under steering order Ci, leakage current to be measured loop, i road and earth terminal GND disconnect, and access simultaneously measuring junction ME loop; After the Measuring Time that duration is t, i road and measuring junction ME loop disconnect, and are connected with earth terminal GND loop; After overprotection duration τ, this measurement to the i road finishes.
8. multichannel leakage current measuring method according to claim 6, it is characterized in that: from this measurement to the i road, finish, to next time, the time that the measurement on i road starts to experience is to (N-1) (t+ τ), the cycle period of measurement is T=N (t+ τ).
9. multichannel leakage current measuring method according to claim 6, it is characterized in that: for N road leakage current measurement, the sampling time on each road is t, the interlock time between measuring-signal is τ, measures cycle period T to be:
T=N(t+τ)。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792413A (en) * | 2014-01-28 | 2014-05-14 | 中国海洋石油总公司 | Multi-channel weak signal acquisition circuit |
| CN107525962A (en) * | 2017-08-21 | 2017-12-29 | 优利德科技(中国)有限公司 | A kind of current measuring method and electric current split-core type meter |
| CN109752619A (en) * | 2017-11-01 | 2019-05-14 | 晓星电力有限责任公司 | Leak electricity amount detecting device |
| CN110320431A (en) * | 2018-03-28 | 2019-10-11 | 西门子医疗有限公司 | Earthing effect monitor is isolated |
| CN113702696A (en) * | 2021-09-08 | 2021-11-26 | 山东元星电子有限公司 | All-in-one current sensor |
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| CN1553206A (en) * | 2003-12-18 | 2004-12-08 | 西安交通大学 | Electric power apparatus external insulative leakage current on-line monitoring system in converting station |
| CN2718591Y (en) * | 2004-05-17 | 2005-08-17 | 西安交通大学 | Dielectric loss on-line monitoring device for capacitive electric equipment |
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2013
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| CN1553206A (en) * | 2003-12-18 | 2004-12-08 | 西安交通大学 | Electric power apparatus external insulative leakage current on-line monitoring system in converting station |
| CN2718591Y (en) * | 2004-05-17 | 2005-08-17 | 西安交通大学 | Dielectric loss on-line monitoring device for capacitive electric equipment |
Non-Patent Citations (2)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792413A (en) * | 2014-01-28 | 2014-05-14 | 中国海洋石油总公司 | Multi-channel weak signal acquisition circuit |
| CN107525962A (en) * | 2017-08-21 | 2017-12-29 | 优利德科技(中国)有限公司 | A kind of current measuring method and electric current split-core type meter |
| CN109752619A (en) * | 2017-11-01 | 2019-05-14 | 晓星电力有限责任公司 | Leak electricity amount detecting device |
| CN110320431A (en) * | 2018-03-28 | 2019-10-11 | 西门子医疗有限公司 | Earthing effect monitor is isolated |
| CN113702696A (en) * | 2021-09-08 | 2021-11-26 | 山东元星电子有限公司 | All-in-one current sensor |
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Application publication date: 20131127 |