CN201945654U - Secondary grounding tester of voltage transformer - Google Patents
Secondary grounding tester of voltage transformer Download PDFInfo
- Publication number
- CN201945654U CN201945654U CN2010205934467U CN201020593446U CN201945654U CN 201945654 U CN201945654 U CN 201945654U CN 2010205934467 U CN2010205934467 U CN 2010205934467U CN 201020593446 U CN201020593446 U CN 201020593446U CN 201945654 U CN201945654 U CN 201945654U
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- wire joint
- test wire
- switch
- voltage transformer
- test
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Abstract
The utility model discloses a secondary grounding tester of a voltage transformer, wherein a top panel of a shell is an insulating board; an alternate current voltmeter, an alternate current ammeter and a variable resistor R are respectively fixed on the insulating board; a switch K, a test wire joint I and a test wire joint II are respectively fixed on a side panel of the shell; a lightning arrester Q is fixed in the shell; the alternate current ammeter and the variable resistor R are connected with each other in series; the alternate current ammeter and the variable resistor R are also connected with the alternate current voltmeter, the switch K and the lightning arrester Q in parallel simultaneously; the two ends of the switch K are respectively connected with the test wire joint I and the test wire joint II. The tester can accurately test the grounding point quantity of the secondary circuit of the voltage transformer, and the tester has the characteristics that the structure is simple, the use is convenient, the safety and the reliability are good, and the metering is accurate.
Description
Technical field
The utility model relates to a kind of instrument that the earth point in voltage transformer secondary loop is tested.
Background technology
In order to guarantee the person and the safety of equipment, one of " electric operating site safety rules " assigned voltage transformer secondary circuit is electrically connected a reliable earth point must be arranged.In order to guarantee the correct work of relay protection and aut.eq., " 18 great anti-accident measures of electrical network of State Grid Corporation of China " 6.3.1 bar regulation: " secondary circuit of utility voltage mutual inductor only allows that one point earth is arranged in the pulpit " the station voltage secondary circuit one point earth of will demanding perfection.But; electric substation's voltage secondary circuit connection device is various; expanded range is wide; usually because artificial wiring error or some inevitable laws of nature, multipoint earthing appears occurring in the secondary circuit in aging etc. as insulation; and the secondary circuit major part of system is outdoor; the probability of insulation damages is big, and multipoint earthing causes the incorrect operation protected, has brought greatly hidden danger for the safe operation and the personal safety of electrical network.
Current each electric equipment producer can only provide the test apparatus of function complexity that the earth point of secondary circuit is tested, and exists operating process loaded down with trivial details, the shortcoming that accuracy is not high.
Summary of the invention
For solving the problem of above existence, the utility model provides a kind of voltage transformer secondary earthing test instrument, and its technical scheme of taking is:
This tester comprises housing, A.C. voltmeter, alternating current ammeter, variohm R, K switch, test wire joint I, test wire joint II and lightning arrester Q, the top panel of housing is an insulcrete, A.C. voltmeter, alternating current ammeter and variohm R are separately fixed on the insulcrete, K switch, test wire joint I and test wire joint II are separately fixed on the side panel of housing, lightning arrester Q is fixed in the housing, alternating current ammeter and variohm series connection, and they and A.C. voltmeter, K switch and lightning arrester Q are in parallel simultaneously, and the two ends of K switch connect test wire joint I and test wire joint II respectively.Be fixed with handle on the side panel of housing.
Electrical network is normally in service, when having only one point earth, has only secondary three-phase unbalanced to ground capacitance current in the grounded screen of flowing through and the N600 loop, voltage transformer secondary loop; In 2 ground connection situations, increased the uneven alternating current between the voltage transformer (VT) in the loop, this tester can be realized conveniently detecting the situation whether multipoint earthing is arranged to these two kinds of electric currents differentiating measurement in addition, makes the staff in time find and solve multipoint earthing hidden danger.Specifically be utilize on the swept resistance string alternating current ammeter and and connect A.C. voltmeter, this branch road substitutes ground wire determines that indirectly thereby the existence of pressure reduction determines whether multipoint earthing, if the voltage transformer secondary loop has only one point earth, when swept resistance changes, the change of voltage table registration is big and the reometer registration is constant substantially, observe the voltage table registration by the resistance that increases R,, illustrate to have 2 above ground connection if voltage table is kept certain registration and the reometer registration diminishes.Lightning arrester connected in parallel in the circuit can prevent that in experimentation physical environment thunderbolt or electrical network occur and produces internal overvoltage and burn out instrument by the loop.
The application of this tester, reduced the probability that electrical network has an accident, the reliability and the security of mains supply have been improved greatly, it is easy to use simultaneously, test weak point consuming time, improved work efficiency greatly, had remarkable economical and social shape benefit, therefore the utlity model has simple in structure, esy to use, safe and reliable, measure accurate characteristics.
Description of drawings
Fig. 1 is an external structure synoptic diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further:
As shown in Figure 1, the top panel of housing 1 is an insulcrete 8, the accessory electric connecting member insulating property that assurance is respectively adhered to, A.C. voltmeter 2, alternating current ammeter 3 and variohm R4 are separately fixed on the insulcrete 8, alternating current ammeter 3 selected ranges are the reometer of 0-100mA, the voltage table of A.C. voltmeter 2 selected range 0-10V, variohm R4 uses the rotary variable resistor of resistance range 0-10 Ω.K switch 5, test wire joint I6 and test wire joint II7 are separately fixed on the side panel of housing 1, lightning arrester Q is fixed in the housing 1, lightning arrester Q selects Zinc-Oxide Arrester for use, it has good non-linear of gapless structure and zinc oxide resistance sheet, test wire joint I6 and test wire joint II7 select plug-in type, and the centre is done insulation by screw and handled, and can cooperate to insert DCC-020 type power test lead, the biside plate of housing 1 installs portable handle 9 additional, is easy to carry.As shown in Figure 2, alternating current ammeter 3 and variohm R4 are by being located at the connecting line series connection in the housing 1, and they are in parallel by connecting line simultaneously with A.C. voltmeter 2, K switch 5 and lightning arrester Q, the two ends of K switch 5 connect test wire joint I6 and test wire joint II7 by connecting line respectively, according to the current capacity of connecting line, select suitable only strand for use.
When using this tester, insert the N600 loop by test wire joint I6 and test wire joint II7, variohm R4 slides to minimum position (0 Ω) and locates, after confirming that wiring is accurate, untie the N600 earth point, Closing Switch K5 slowly increases the resistance of variohm R4, observes and the reading of record A.C. voltmeter 2 and alternating current ammeter 3.When swept resistance changed, the change of voltage table registration was big and the reometer registration is constant substantially, illustrated and pressed transformer secondary circuit to have only one point earth, if voltage table is kept certain registration and the reometer registration diminishes, illustrated to have multipoint earthing.This tester has been realized the easy measurement of voltage transformer secondary loop earth point, is convenient to determine whether the voltage transformer secondary loop has the multipoint earthing situation to exist, and stops the protective device tripping and the malfunction that cause because of multipoint earthing, ensures the power grid security reliability service.
Claims (2)
1. voltage transformer secondary earthing test instrument, comprise housing (1), A.C. voltmeter (2), alternating current ammeter (3), variohm R (4), K switch (5), test wire joint I (6), test wire joint II (7) and lightning arrester Q, it is characterized in that: the top panel of housing (1) is insulcrete (8), A.C. voltmeter (2), alternating current ammeter (3) and variohm R (4) are separately fixed on the insulcrete (8), K switch (5), test wire joint I (6) and test wire joint II (7) are separately fixed on the side panel of housing (1), lightning arrester Q is fixed in the housing (1), alternating current ammeter (3) and variohm (4) series connection, and they and A.C. voltmeter (2), K switch (5) and lightning arrester Q are in parallel simultaneously, and the two ends of K switch (5) connect test wire joint I (6) and test wire joint II (7) respectively.
2. voltage transformer secondary earthing test instrument according to claim 1 is characterized in that: be fixed with handle (9) on the side panel of housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205934467U CN201945654U (en) | 2010-11-05 | 2010-11-05 | Secondary grounding tester of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205934467U CN201945654U (en) | 2010-11-05 | 2010-11-05 | Secondary grounding tester of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201945654U true CN201945654U (en) | 2011-08-24 |
Family
ID=44472994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205934467U Expired - Fee Related CN201945654U (en) | 2010-11-05 | 2010-11-05 | Secondary grounding tester of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201945654U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777405A (en) * | 2015-04-30 | 2015-07-15 | 国家电网公司 | Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof |
| CN105954642A (en) * | 2016-06-08 | 2016-09-21 | 国网山西省电力公司阳泉供电公司 | Portable PT one-point grounding tester |
| CN106054014A (en) * | 2016-07-11 | 2016-10-26 | 国网山东省电力公司聊城供电公司 | N600 one-point grounding test device and application thereof |
-
2010
- 2010-11-05 CN CN2010205934467U patent/CN201945654U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777405A (en) * | 2015-04-30 | 2015-07-15 | 国家电网公司 | Passive voltage transformer secondary circuit N600 multipoint grounding finder and operation method thereof |
| CN104777405B (en) * | 2015-04-30 | 2018-07-31 | 国家电网公司 | Passive type Secondary Circuit of Potential Transformer N600 multipoint earthing locators and its operation method |
| CN105954642A (en) * | 2016-06-08 | 2016-09-21 | 国网山西省电力公司阳泉供电公司 | Portable PT one-point grounding tester |
| CN106054014A (en) * | 2016-07-11 | 2016-10-26 | 国网山东省电力公司聊城供电公司 | N600 one-point grounding test device and application thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110824 Termination date: 20111105 |