CN202159109U - Grounding fault testing device of electric system - Google Patents
Grounding fault testing device of electric system Download PDFInfo
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- CN202159109U CN202159109U CN2011202704858U CN201120270485U CN202159109U CN 202159109 U CN202159109 U CN 202159109U CN 2011202704858 U CN2011202704858 U CN 2011202704858U CN 201120270485 U CN201120270485 U CN 201120270485U CN 202159109 U CN202159109 U CN 202159109U
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Abstract
The utility model relates to a grounding fault testing device of an electric system, which comprises a power supply generator (5), a first current-limiting resistance R1, a second current-limiting resistance R2 and a detector (4) for detecting the current or phase of a detected branch circuit (3), wherein the power supply generator (4), the first current-limiting resistance R1 and the second current-limiting resistance R2 are connected in series, the power supply generator (5) outputs alternating current 0-50V voltage and 0.5-1A of current, and the frequency is 50Hz. When the detected branch circuit or equipment has grounding faults, the current meter of the detector, which is connected on a tested object in series, has no current indication, which shows that the detected zone is in short circuit, or, the phase meter of the detector, which is connected on the tested object in parallel, displays 90-degree turning, which also shows that the detected zone is in short circuit. The grounding fault testing device of the electric system, disclosed by the utility model, has the advantages that the operation is simple, the response is quick, and the structure is simple.
Description
Technical field
The utility model relates to the fault detect of the improper ground connection of electrical system, specifically is a kind of electrical system earth fault proving installation.
Background technology
Electrical system is the complicated huge network that electric energy produces, carries, uses each link to form; The fault that insulate the improper ground connection of decline generation equipment in use can appear in equipment wherein such as generator, motor, power cable, transmission and distribution networks etc.; Must fix a breakdown, equipment could normal operation.Fix a breakdown must the first localization of faults the position, quick and precisely find the trouble spot, the restorer of fixing a breakdown rapidly operation is for main equipment, with producing very big economic benefit.In most of industrial and mining enterprises, because site environment is relatively poor, on-site electrical equipment like motor, electric welding machine, lighting device etc., earth fault very easily occurs.When earth fault occurring in the past; The normal method of drawing switch that adopts is searched; This method implements the comparison difficulty, such as a type load manufacturing enterprise, tends to cause serious loss when searching ground connection when production is had a power failure; Particularly, will affect greatly end product in case cut off an equipment to the extremely strong enterprise of production continuity.
Known this type of fault of searching has following several kinds at present: 1. low frequency signal injection method one is after earth fault appears in equipment; Between earthing power supply and ground, inject the low frequency signal of a frequency alternate, low-frequency current flows out from signal generator, returns from ground through earth point; Detect with the pointwise of pincers type current probe; The low-frequency current trend is tracked, seek earth point, confirm the earth point position according to this criterion of difference that the low-frequency current before and after the earth point occurs along the ground connection branch road.Owing to be low-frequency ac signal; Correctness and sensitivity that this method detects receive the influence of faulty line system distributed capacitance very big; When high resistance earthing fault, will make operating personnel be difficult to confirm that capacitance current still is the stake resistance electric current, be difficult to distinguish the ground connection branch road.2. direct current signal injection method one injects a direct current signal between earthing power supply and ground after earth fault appears in equipment, and DC current flows out from signal generator, returns from ground through earth point, detects with the pointwise of direct current pincers type current probe, and principle is the same.This mode has overcome the influence of distributed capacitance; But owing to use direct current pincers type current probe to receive signal; There is the direct current signal drift in this receiver; Especially block and block personal error, the letter that the line test caused before the line after the zero setting again and write drift, can't accurately, truly reflect test signal, artificial greatly reception error causes this mode can't use basically.
Summary of the invention
The purpose of the utility model provides a kind of simple in structure, device of detecting accurate, easy to operate active online in real time detection of ground faults.
Said electrical system earth fault proving installation is by a power source generator, the first current-limiting resistance R1, the second current-limiting resistance R2, and a detector composition that is used to detect tested branch current or phase place; Power source generator, first, second current-limiting resistance R1, R2 are connected in series, power source generator output AC 0～50V voltage, and 0.5～1A electric current, frequency is 50Hz.
When earth fault occurring on tested branch road or the equipment, the detector reometer that is series on this measurand will not have the electric current indication, show tested section short circuit; Or the detector PH phasemeter that is parallel on the measurand shows 90 degree upsets, shows tested section short circuit equally.It is thus clear that said electrical system earth fault proving installation operation is very easy, reaction is quick.
Description of drawings
Fig. 1 is the utility model first embodiment circuit theory diagrams;
Fig. 2 is the utility model second embodiment circuit theory diagrams.
Embodiment
Said electrical system earth fault proving installation is made up of the detector 4 that a power source generator 5, the first current-limiting resistance R1, the second current-limiting resistance R2 and are used to detect tested branch road 3 electric currents or phase place; Power source generator 5, first and second current-limiting resistance R1, R2 are connected in series, power source generator 5 output ACs 0～50V voltage, and 0.5～1A electric current, frequency is 50Hz.
In embodiment circuit theory diagrams shown in Figure 1, the detector 4 of employing is a kind of reometer.Said device current transformer CT is serially connected in tested point A, the B two ends of tested branch road 3, and reometer is connected on the secondary circuit of current transformer CT, and through current transformer 4-3, the detection branch electric current can detect A, the interval ground-fault condition of B.Tested branch road 3, current mode detector 4, power source generator 5, first and second current-limiting resistance R1, R2 are connected in series, and form to detect the loop.If reometer does not have the electric current indication when tested branch road 3 has earth fault, 2 short circuits of AB when earth fault is arranged, promptly the reometer and the first current-limiting resistance R1 loop short circuit shown in dotted line among Fig. 1, do not have electric current to pass through, thereby the detection reometer does not have the electric current indication.Also say that with regard to electricity there are short trouble in A, B.
In the embodiment circuit theory diagrams shown in Figure 2, the detector 4 of employing is a kind of phase meter.Voltage transformer (VT) CT-1, the CT-2 of said Device Testing appearance phase meter is attempted by tested point A, the B point of tested branch road 3, through voltage transformer (VT) 4-1, the 4-2 detected phase of phase meter.Tested branch road 3, power source generator 5, first and second current-limiting resistance R1, R2 are connected in series, and add phase type detector 4, form to detect the loop.Suppose that there is earth fault in the B point, R1 then, the CT-1 loop shown in dotted line among Fig. 2, is not had electric current to pass through by short circuit among the CT-1, phase meter shows 90 upsets, if phase meter not upset then this lead is normal.Carry out next lead test, quick and precisely find the trouble spot.
The label of the first current-limiting resistance R1 is that the label of 1, the second current-limiting resistance R2 is 2 among Fig. 1, Fig. 2.
Claims (2)
1. electrical system earth fault proving installation is characterized in that: said device is made up of the detector (4) that a power source generator (5), the first current-limiting resistance R1, the second current-limiting resistance R2 and are used to detect tested branch road (3) electric current or phase place; Power source generator (5), first and second current-limiting resistance R1, R2 are connected in series.
2. electrical system earth fault proving installation according to claim 1 is characterized in that: power source generator (5) output AC 0～50V voltage, and 0.5～1A electric current, frequency is 50Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202704858U CN202159109U (en) | 2011-07-28 | 2011-07-28 | Grounding fault testing device of electric system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202704858U CN202159109U (en) | 2011-07-28 | 2011-07-28 | Grounding fault testing device of electric system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202159109U true CN202159109U (en) | 2012-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202704858U Expired - Fee Related CN202159109U (en) | 2011-07-28 | 2011-07-28 | Grounding fault testing device of electric system |
Country Status (1)
| Country | Link |
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| CN (1) | CN202159109U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777108A (en) * | 2013-10-24 | 2014-05-07 | 黄政 | Method for quickly searching grounding fault point of electrical equipment |
-
2011
- 2011-07-28 CN CN2011202704858U patent/CN202159109U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777108A (en) * | 2013-10-24 | 2014-05-07 | 黄政 | Method for quickly searching grounding fault point of electrical equipment |
| CN103777108B (en) * | 2013-10-24 | 2017-08-25 | 黄政 | A kind of method of quick lookup electrical equipment grounding trouble point |
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| Date | Code | Title | Description |
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| 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: 20120307 Termination date: 20170728 |
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| CF01 | Termination of patent right due to non-payment of annual fee |