CN101963642B - Testing method and instrument of multipoint earthing slide-variable resistance of common circuit - Google Patents
Testing method and instrument of multipoint earthing slide-variable resistance of common circuit Download PDFInfo
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- CN101963642B CN101963642B CN201010297575A CN201010297575A CN101963642B CN 101963642 B CN101963642 B CN 101963642B CN 201010297575 A CN201010297575 A CN 201010297575A CN 201010297575 A CN201010297575 A CN 201010297575A CN 101963642 B CN101963642 B CN 101963642B
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Abstract
The invention discloses testing method and instrument of multipoint earthing slide-variable resistance of a common circuit. The testing method comprises the following steps of: breaking the earthing point of the tested N wire by connecting a slide-variable resistor and an alternating-current ampere meter between the tested N wire and the earthing point to change the resistance value of the slide-variable resistor; and judging whether multipoint earthing exists in the common circuit or not by collecting the current value of the alternating-current ampere meter, wherein the current value changes along with the resistance value of the slide-variable resistor. The testing instrument of multipoint earthing slide-variable resistance of the common circuit can directly detect whether multipoint earthing exists in the common circuit or not, thereby having simple and convenient operation, friendly and visual interface. The testing method and instrument can be widely applied to the operation and detection of electric power sites.
Description
Technical field
The present invention relates to a kind of method of testing of common return multipoint earthing.The invention still further relates to a kind of common return multipoint earthing tester.
Background technology
The conventional means of investigation PT secondary circuit multipoint earthing is through the test of PT secondary voltage drop and two kinds of approach of N line zero sequence current measurement at present.Because the field staff does not have specialized equipment and judges; Whether multipoint earthing takes place and searches all very difficult; And the hidden danger of secondary circuit multipoint earthing has incorrect and WT-MSR inaccurate of burning screen layer, causing protective device action; Even cause the great risk of large area blackout; Happen occasionally in the actual electric network accident that causes owing to the secondary circuit multipoint earthing in service, so the field personnel is badly in need of a kind of device that can conveniently detect the secondary circuit multipoint earthing.
Summary of the invention
In order to solve above-mentioned technical matters, the objective of the invention is: improve the method for testing of test of traditional P T secondary voltage drop and the test of N line zero-sequence current, a kind of slide-changing resistor detection method is provided.
Another object of the present invention is: a kind of common return multipoint earthing tester is provided, and this tester can accurately be measured tested N line and whether have multipoint earthing.
The technical scheme that the present invention is adopted for its technical matters of solution is:
A kind of common return multipoint earthing slide-changing resistor method of testing, it may further comprise the steps:
A. between tested N line and earth point, be connected in series an alternating current ammeter and slide-changing resistor device;
B. slide-changing resistor device resistance is adjusted into zero, unties the earth point of tested N line;
C. slide-changing resistor device resistance is extremely maximum by zero adjustment, record alternating current ammeter current value;
D. observe the variation of alternating current ammeter current value I with slide-changing resistor device change in resistance, diminish greatly if the alternating current ammeter current value I becomes with slide-changing resistor device resistance, then this N line of decidable has or multipoint earthing phenomenon at 2; If this N line of the invariable then decidable of alternating current ammeter current value I is an one point earth.
Further as preferred embodiment, this slide-changing resistor device change in resistance scope is 0 ~ 5 Europe.
A kind of common return multipoint earthing slide-changing resistor tester comprises a slide-changing resistor device, and this slide-changing resistor device is connected in series an alternating current ammeter, and said slide-changing resistor device and alternating current ammeter are connected between tested N line and the earth point.
Further as preferred embodiment; This common return multipoint earthing slide-changing resistor tester also comprises an Intelligent Recognition control system and shows LCD; Said this Intelligent Recognition control system of alternating current ammeter electric signal input, the output terminal of this Intelligent Recognition control system is connected with the input end that shows LCD.
Further as preferred embodiment, this slide-changing resistor device change in resistance scope is 0 ~ 5 Europe.
The invention has the beneficial effects as follows: the inventive method is employed in and inserts a slide-changing resistor device and an alternating current ammeter between tested N line and earth point; Break off the earth point of tested N line, judge automatically through the big I that detects slide-changing resistor device change in resistance front and back circuital current whether this common return exists multipoint earthing.The present invention provides a kind of reliable method, facility simple to operate for detecting the common return multipoint earthing.
Another beneficial effect of the present invention is: tester of the present invention provides a kind of light and handy easy testing tool for detecting the common return multipoint earthing, and simple to operation, friendly interface is directly perceived.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described further:
Fig. 1 is that slide-changing resistor method multipoint earthing detects schematic diagram;
Fig. 2 is the equivalent circuit diagram of common return single-point grounding test;
Fig. 3 is the equivalent circuit diagram of common return multipoint earthing test.
Embodiment
Shown in accompanying drawing 1, a kind of common return multipoint earthing slide-changing resistor method of testing, it may further comprise the steps:
A. serial connection one alternating current ammeter 2 and slide-changing resistor device 1 between tested N line 4 and earth point A, B;
B. slide-changing resistor device 1 resistance is adjusted into zero, unties the earth point of tested N line 4;
C. slide-changing resistor device 1 resistance is extremely maximum by zero adjustment, record alternating current ammeter 2 current value I;
D. observe the variation of alternating current ammeter 2 current value I with slide-changing resistor device 1 change in resistance, diminish greatly if alternating current ammeter 2 current value I become with slide-changing resistor device 1 resistance, then this N line of decidable has or multipoint earthing phenomenon at 2; If this N line of the invariable then decidable of alternating current ammeter 2 current value I is an one point earth.
Further as preferred embodiment, this slide-changing resistor device 1 change in resistance scope is 0 ~ 5 Europe.
If electric current hour in the test, the registration of alternating current ammeter 2 has than large deviation, can on tested N line 4, connect a high precision clamp on amperemeter 3, can take the data that pincers type reometer 3 data are replaced alternating current ammeter 2.
During tested N line 4 one point earths, break off earth point, between tested N line 4 and earth point A, B, seal in a slide-changing resistor device 1 and alternating current ammeter 2.Because the ground current of earth point is a cable capacitance current over the ground during power frequency component, if distributed capacitance is C over the ground, threshold voltages such as P T secondary are U1, and the equivalent electrical circuit that measure this moment is as shown in Figure 2.The distributed capacitance impedance is big, and slide-changing resistor R (0～5 Ω), " 1/jwc, so capacitive reactance and U1 decision loop current, when the slide-changing resistor resistance changed, the alternating current Table I remained unchanged R.
During 4 two ground connection of tested N line, two earth points exist electric potential difference U2, the existence of electric potential difference U2 on the net on ground; Break off the continuous earth point, between tested N line 4 and earth point A, B, seal in a slide-changing resistor device 1 and alternating current ammeter 2, for U2; Over the ground the impedance 1/jwc of distributed capacitance C very I ignore, the stake resistance of another earth point is made as r, the equivalent electrical circuit of U2 is as shown in Figure 3; Because the existence of stake resistance r branch road; When slide-changing resistor device 1 resistance R increased, stake resistance r shunting I3 increased, and alternating current ammeter 2 electric current I 2 will reduce.So reduce if alternating current ammeter 2 electric current I 2 increase with slide-changing resistor device 1 resistance R, then this N line of decidable has or multipoint earthing phenomenon at 2; If alternating current ammeter 2 electric current I 2 increase and invariable with slide-changing resistor device 1 resistance R, then this N line of decidable is an one point earth.
A kind of common return multipoint earthing slide-changing resistor tester comprises a slide-changing resistor device 1, this slide-changing resistor device 1 serial connection one alternating current ammeter 2, and said slide-changing resistor device 1 and alternating current ammeter 2 are connected between tested N line 4 and the earth point.
Further as preferred embodiment; This common return multipoint earthing slide-changing resistor tester also comprises an Intelligent Recognition control system and shows LCD; Said this Intelligent Recognition control system of alternating current ammeter 2 electric signal input; This Intelligent Recognition control system is gathered input signal, matees through the built-in multipoint earthing pattern of electric current situation of change and system, thereby realizes multipoint earthing whether measuring ability.The output terminal of this Intelligent Recognition control system is connected with the input end that shows LCD, and LCD display part branch shows whether detecting pattern, size of current, multipoint earthing wait information.
Further as preferred embodiment, this slide-changing resistor device 1 change in resistance scope is 0 ~ 5 Europe.
More than be that preferable enforcement of the present invention is specified; But the invention is not limited to said embodiment; Those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of spirit of the present invention, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (2)
1. common return multipoint earthing slide-changing resistor method of testing, it is characterized in that: it may further comprise the steps:
A. between tested N line (4) and earth point, be connected in series an alternating current ammeter (2) and slide-changing resistor device (1);
B. slide-changing resistor device (1) resistance is adjusted into zero, unties the earth point of tested N line (4);
C. slide-changing resistor device (1) resistance is extremely maximum by zero adjustment, record alternating current ammeter (2) current value (I);
D. observe the variation of alternating current ammeter (2) current value (I) with slide-changing resistor device (1) change in resistance, diminish greatly if alternating current ammeter (2) current value (I) becomes with slide-changing resistor device (1) resistance, then this N line of decidable has or multipoint earthing phenomenon at 2; If this N line of the invariable then decidable of alternating current ammeter (2) current value (I) is an one point earth.
2. common return multipoint earthing slide-changing resistor method of testing according to claim 1 is characterized in that: this slide-changing resistor device (1) change in resistance scope is 0 ~ 5 Europe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010297575A CN101963642B (en) | 2010-09-30 | 2010-09-30 | Testing method and instrument of multipoint earthing slide-variable resistance of common circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010297575A CN101963642B (en) | 2010-09-30 | 2010-09-30 | Testing method and instrument of multipoint earthing slide-variable resistance of common circuit |
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| CN101963642A CN101963642A (en) | 2011-02-02 |
| CN101963642B true CN101963642B (en) | 2012-10-03 |
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| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2722265Y (en) * | 2004-09-17 | 2005-08-31 | 姜洪腾 | DC grounding on-line tester |
| CN101661072A (en) * | 2009-09-23 | 2010-03-03 | 河南省电力公司商丘供电公司 | Online monitoring device and monitoring method of multipoint earthing of iron core of transformer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0275975A (en) * | 1988-09-12 | 1990-03-15 | Mitsubishi Paper Mills Ltd | Detecting instrument for defective insulation part in electric wiring system |
| JP2008232737A (en) * | 2007-03-19 | 2008-10-02 | Kansai Electric Power Co Inc:The | Electric leakage detection method and digital tester used in the same method |
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- 2010-09-30 CN CN201010297575A patent/CN101963642B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2722265Y (en) * | 2004-09-17 | 2005-08-31 | 姜洪腾 | DC grounding on-line tester |
| CN101661072A (en) * | 2009-09-23 | 2010-03-03 | 河南省电力公司商丘供电公司 | Online monitoring device and monitoring method of multipoint earthing of iron core of transformer |
Non-Patent Citations (3)
| Title |
|---|
| JP平2-75975A 1990.03.15 |
| JP特开2008-232737A 2008.10.02 |
| 陈占方 等.直流系统接地故障检测的研究.《仪表技术》.1996,(第2期),第23-28页. * |
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