CN2263794Y - Megger with high-low pressure screen method switcher - Google Patents
Megger with high-low pressure screen method switcher Download PDFInfo
- Publication number
- CN2263794Y CN2263794Y CN 95214461 CN95214461U CN2263794Y CN 2263794 Y CN2263794 Y CN 2263794Y CN 95214461 CN95214461 CN 95214461 CN 95214461 U CN95214461 U CN 95214461U CN 2263794 Y CN2263794 Y CN 2263794Y
- Authority
- CN
- China
- Prior art keywords
- terminal
- screen method
- low pressure
- power supply
- contact
- 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
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Abstract
The utility model relates to a megger with a high-low tension screen method switcher. A high-low tension screen method converting switch which is provided with a high tension screen method contact group and a low tension screen method contact group is added on the basis of a main component of the existing electronic type high tension megger. Consequently, the utility model provides a megger which can be used for conversing and selecting conveniently and quickly the high tension screen method or the low tension screen method according to actual condition of field devices so as to avoid the interference of stray current and enhance the safety.
Description
The design relates to a kind of electrical insulation testing instrument, particularly a kind of megger with high-low pressure screen method switch.
Have now and generally be used in the electronic type high tension megger (comprising the high tension megger that has microcomputer) that electrical equipment carries out megger test, its metering circuit all is that to be in a certain current potential side and majority regularly be to be in negative hot side regularly, so it for the test of non-ground connection test product with also can only take the high-tension shielding method for the test of ground connection test product is the same, this is irrational.Conversely, metering circuit is in the megohmmeter of low potential side regularly, takes the test effect of lv shielded method again not as the high-tension shielding method for the ground connection test product.Because the ground connection situation of on-the-spot test product is different, so existing the type tester exists certain limitation when reality is used at the scene.
The design's purpose provide a kind of can be according to the actual condition of field apparatus, the megger of high-tension shielding method or lv shielded method is selected in conversion easily, thereby overcomes the above-mentioned weak point of existing tester.
For reaching this purpose, the technical solution that the design takes is: increase the high-low pressure screen method switch with high-tension shielding method sets of contacts and lv shielded method sets of contacts on the master component basis of existing electronic type high tension megger.When this switch places the high-tension shielding tagmeme, the shielding terminal is connected to the negative high-voltage end of testing power supply, near-earth test terminal ground connection, the live wire terminal of metering circuit and zero terminal are serially connected between the negative high-voltage end of test product and testing power supply, and metering circuit is from the ground far away side-draw sample current signal of test product; When this switch places the lv shielded method position, far test the negative high-voltage end that terminal is connected to testing power supply, shielding terminal ground connection, the live wire terminal of metering circuit and zero terminal are serially connected between test product and the ground, and metering circuit is from the near-earth side-draw sample current signal of test product.
Therefore the design has: can be according to on-the-spot test product actual condition, and the high and low pressure screen method is used in conversion easily, with the interference of avoiding stray current and strengthen advantage such as security.
Below in conjunction with accompanying drawing the design is further specified.
Be the master component of the electronics megohmmeter (M) of prior art in the frame of broken lines in the accompanying drawing---testing power supply (Us), metering circuit (C) and live wire terminal (L ') thereof, ground wire terminal (E '), zero terminal (G ').When reequiping, the primary circuit tie between the negative high-voltage end of terminal (G ') and testing power supply (Us) must be disconnected by the design; The two ends of test product (Rx) are connected to the terminal (L) of testing of this megger respectively far awayly and test terminal (E) with near-earth, and the shading ring of test product (Rx) is connected to shielding terminal (G).Shielding terminal (G) directly links with zero terminal (G ').
The contact of high-low pressure screen method switch (LE) is divided into: high-tension shielding method sets of contacts (L1-L1 '), (L2-L2 '), (L3-L3 ') and lv shielded method sets of contacts (E1-E1 '), (E2-E2 '), (E3-E3 ').Wherein: contact (E1), (L3) are with the positive low pressure end ground connection of terminal (E ') and testing power supply (Us), contact (L1), (E3) are connected to the negative high-voltage end of testing power supply (Us) together, contact (L1 ') links with (E1 ') and is connected to terminal (G), (G '), contact (E3 ') with (L2) link and be connected to terminal (L), contact (L3 ') with (E2) link and be connected to terminal (E), contact (L2 ') links with (E2 ') and is connected to terminal (L ').
When test ground connection test product, switch (LE) places the high-tension shielding tagmeme: sets of contacts (L1-L1 ') is logical, and (L2-L2 ') is logical, and (L3-L3 ') is logical; Sets of contacts (E1-E1 ') is disconnected, (E2-E2 ') is disconnected, (E3-E3 ') is disconnected, terminal (L) communicates with (L '), terminal (G) communicates with testing power supply (Us) negative high-voltage end, terminal (E) communicates with (E ') and ground connection, thereby the test product current signal flow to the negative high-voltage end of power supply (Us) through the live wire terminal (L ') of terminal (E '), sets of contacts (L3-L3 '), test product (Rx), sets of contacts (L2-L2 '), metering circuit (C) and zero terminal (G ') and sets of contacts (L1-L1 ') from the positive low pressure end of power supply (Us).This sample megger is from the ground far away side-draw sample current signal of test product (Rx), and the test product shading ring also is connected to negative noble potential, thereby shielded high pressure stray current over the ground effectively.
When the non-ground connection test product of test, switch (LE) places the lv shielded method position, and sets of contacts (L1-L1 ') is disconnected, and (L2-L2 ') is disconnected, and (L3-L3 ') is disconnected; Sets of contacts (E1-E1 ') is logical, (E2-E2 ') is logical, (E3-E3 ') is logical, terminal (E) communicates with terminal (L '), terminal (G), (G ') ground connection, terminal (L) communicates with power supply (Us) negative high-voltage end, thereby the test product power supply signal from the positive low pressure end of power supply (Us) through terminal (E '), sets of contacts (E1-E1 '), the zero terminal (G ') of metering circuit (C) flow to the power-high-pressure side with live wire terminal (L '), sets of contacts (E2-E2 '), test product (Rx) and sets of contacts (E3-E3 ').This sample megger is from the near-earth side-draw sample signal of test product (Rx), and also ground connection of test product shading ring, therefore shielded the interference of stray current effectively.Because this survey method makes megger be in electronegative potential, so strengthened the security of test.
High-low pressure screen method switch (LE) can be used existing switch manufacturing technology and make, can make the plugs and sockets formula such as its shape, it is knockdown also can to make turn, no matter but take which kind of shape, the dielectric strength between its each contact should be able to the resistance test ceiling voltage.
The design has the principal character of three pairs of sets of contacts as the design with high-low pressure screen method switch (LE), in fact can also increase some sets of contacts and realize additional function, for example can increase a sets of contacts that connects pilot lamp, with as the instrument indication or the like of the state of residing high and low screen method position at present, but the design people thinks that these belong to additional function, not the design's major technology feature, therefore do not illustrate at this.And for example this switch can also only have two pairs of sets of contacts, but this comes megger just to need sample resistance of increase to replace a pair of sets of contacts, in fact increased the difference between the high and low pressure screen method is measured, therefore the design people thinks that this is a kind of not advanced scheme, is not further elaborated at this yet.
Claims (2)
1, a kind of megger is made up of testing power supply, metering circuit and the test end line that is connected test product, it is characterized in that:
Has one by high-tension shielding method sets of contacts (L1-L1 '), (L2-L2 '), (L3-L3 ') and lv shielded method sets of contacts (E1-E1 '), (E2-E2 '), the high-low pressure screen method switch (LE) that (E3-E3 ') constitutes, when high-low pressure screen method switch (LE) places the high-tension shielding tagmeme, shielding terminal (G) is connected to the negative high-voltage end of testing power supply (Us), near-earth test terminal (E) ground connection, the live wire terminal (L ') of metering circuit (C) and zero terminal (G ') are serially connected between the negative high-voltage end of test product (Rx) and testing power supply (Us), and metering circuit (C) is from the ground far away side-draw sample current signal of test product (Rx); When high-low pressure screen method switch (LE) places the lv shielded method position, far test terminal (L) and be connected to the negative high-voltage end of testing power supply (Us), shielding terminal (G) ground connection, the live wire terminal (L ') of metering circuit (C) and zero terminal (G ') are serially connected between test product (Rx) and the ground, and metering circuit (C) is from the near-earth side-draw sample current signal of test product (Rx).
2, megger according to claim 1, the circuit connecting relation that it is characterized in that each contact of said high-low pressure screen method switch (LE) is: contact (E1), (L3) all with the positive low pressure end ground connection of terminal (E ') and testing power supply (Us), contact (L1), (E3) be connected to the negative high-voltage end of testing power supply (Us) together, contact (L1 ') links with (E1 ') and is connected to terminal (G), (G '), contact (E3 ') with (L2) link and be connected to terminal (L), contact (L3 ') with (E2) link and be connected to terminal (E), contact (L2 ') links with (E2 ') and is connected to terminal (L ').
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95214461 CN2263794Y (en) | 1995-06-10 | 1995-06-10 | Megger with high-low pressure screen method switcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95214461 CN2263794Y (en) | 1995-06-10 | 1995-06-10 | Megger with high-low pressure screen method switcher |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2263794Y true CN2263794Y (en) | 1997-10-01 |
Family
ID=33864085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95214461 Expired - Fee Related CN2263794Y (en) | 1995-06-10 | 1995-06-10 | Megger with high-low pressure screen method switcher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2263794Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825661A (en) * | 2010-05-18 | 2010-09-08 | 宁波大学 | Instrument for dynamically measuring high resistance |
-
1995
- 1995-06-10 CN CN 95214461 patent/CN2263794Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825661A (en) * | 2010-05-18 | 2010-09-08 | 宁波大学 | Instrument for dynamically measuring high resistance |
| CN101825661B (en) * | 2010-05-18 | 2011-12-28 | 宁波大学 | Instrument for dynamically measuring high resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |