CN201311460Y - Dielectric loss tester with high-voltage output false ground protection function - Google Patents
Dielectric loss tester with high-voltage output false ground protection function Download PDFInfo
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- CN201311460Y CN201311460Y CNU2008201065573U CN200820106557U CN201311460Y CN 201311460 Y CN201311460 Y CN 201311460Y CN U2008201065573 U CNU2008201065573 U CN U2008201065573U CN 200820106557 U CN200820106557 U CN 200820106557U CN 201311460 Y CN201311460 Y CN 201311460Y
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- relay
- tester
- triode
- normally opened
- opened contact
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Abstract
The utility model relates to a dielectric loss tester with a high-voltage output false ground protection function, which belongs to the technical field of testing and is used for solving the safety problem. The dielectric loss tester comprises a tester used for testing dielectric loss, a false ground judge circuit and a false ground protection circuit, wherein the false ground judge circuit comprises two dynatrons and a first relay, and the false ground protection circuit comprises three relays and a third dynatron. The utility model rapidly judges and protects the ground fault of a high-voltage output end, thereby effectively protecting the dielectric loss tester and the personnel safety of operators.
Description
Technical field
The utility model relates to a kind of dielectric loss tester, can to the misconnection of tool high-voltage output end judge and protected, belong to technical field of measurement and test.
Background technology
When working medium loss test instrument carries out the dielectric loss test to power equipment, sometimes the operator can be by mistake with high-voltage output line ground connection, to make instrument damage if the operator proceeds the test operation that boosts this moment, also may cause personal injury to the operator when serious.Therefore, must be improved, make it the misconnection ground of high-voltage output end is judged rapidly and protected existing dielectric loss tester.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of can to the misconnection of high-voltage output end the dielectric loss tester that judges and protected with high pressure output misconnection ground defencive function.
Problem described in the utility model realizes with following technical proposals:
A kind of dielectric loss tester with high pressure output misconnection ground defencive function, form by the tester that is used for the tested media loss, misconnection ground decision circuitry and misconnection ground holding circuit, described misconnection ground decision circuitry is made up of two triodes and first relay, first triode and second triode are connected into two-stage amplifier and drive first relay, the output terminal of this two-stage amplifier also connects power cathode through first normally opened contact of first relay, and input end connects the high-voltage output end of tester successively through the normally opened contact of current-limiting resistance, isolating diode and second relay; Described misconnection ground holding circuit is made of three relays and the 3rd triode, and the coil of second relay connects direct supply through the normally closed contact of the 3rd relay; Described the 3rd triode is connected into common-emitter amplifier, and the coil of the 3rd relay is its collector load, and its base stage is provided with upper offset resistance and below-center offset electric capacity, and connects power cathode through the normally opened contact of first relay; The coil of the 4th relay connects direct supply through the normally opened contact of the 3rd relay and the normally closed contact of first relay successively, the high pressure output of its normally opened contact control tester.
Above-mentioned dielectric loss tester with high pressure output misconnection ground defencive function, set up high tension protection circuit, described high tension protection circuit is made up of two relays and the 4th triode, the 4th triode is connected into common-emitter amplifier, the coil of the 5th relay J 5 is its collector loads, its base stage is successively through repeating resistance, the normally opened contact of the voltage stabilizing diode and second relay connects the high-voltage output end of tester, the collector of the 4th triode also connects power cathode through first normally opened contact of the 5th relay, and the normally closed contact of the 5th relay J 5 is series at second, in the current supply circuit of the 4th relay coil; The coil of the 6th relay connects direct supply through second normally opened contact of first relay and the normally closed contact of the 5th relay successively, and connects direct supply through the normally opened contact of the 5th relay; The AC power of the normally closed contact control tester of the 6th relay.
Whether the utility model utilizes misconnection ground decision circuitry to having high pressure misconnection ground phenomenon to judge, by misconnection ground holding circuit according to judged result control tester output HIGH voltage whether, prevent because of the high pressure misconnection cause instrument damage and personal injury.High tension protection circuit is used to prevent that the high voltage of tester output from sealing in misconnection ground decision circuitry and misconnection ground holding circuit, in order to avoid they are impaired.The utility model can judge rapidly and be protected the misconnection electricity of high-voltage output end, effectively protective medium loss test instrument and operator's personal safety.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is an electrical schematic diagram of the present utility model.
Each label is among the figure: T1, pressure regulator; T2, high-tension transformer; Q1～Q4, triode; J1～J6, relay; D1～D7, diode; C1～C3, electric capacity; R1～R5, resistance; W, potentiometer.
Embodiment
The utility model has been realized the automatic judgement on high pressure output misconnection ground and the function that stops high pressure to be exported.For instrument and operator provide safety assurance.
Referring to Fig. 1, triode Q1, Q2 and relay J 1 and resistance R 2, R3, potentiometer W form misconnection ground decision circuitry, input end connects the high-voltage output end of tester successively through the normally opened contact J2-1 of current-limiting resistance R1, isolating diode D1 and second relay J 2, the double-pole normally closed contact of the 6th relay J 6 inserts the once end of pressure regulator, and this partial circuit uses the instrument internal power supply.Diode D4, D5, D7 are fly-wheel diode, are used to protect triode Q3, Q2, Q4.Diode D2, D3 play buffer action, prevent that the collector potential of triode Q2 and the base potential of triode Q3 from influencing each other.When contact J1-1 is closed, can make relay J 1 keep attracting state.When contact J5-1 is closed, can make relay J 5 keep attracting state.
The course of work of the present utility model:
1; when the voltage wiring correctly or not connects hi-line; in the moment of closing power switch device; relay J 2 actions; its normally opened contact J2-1 closure is communicated with misconnection ground decision circuitry and high-voltage output line, and resistance R 4 gives capacitor C 1 charging; the base potential of the 3rd triode Q3 raises gradually; after the triode Q2 conducting, 3 actions of the 3rd relay J, contact J3-2 connects; make the J4 action; contact J4-1 connects, and instrument can be exported high pressure, simultaneously; relay J 2 outages; its normally opened contact J2-1 tripping has been avoided high pressure to enter low-voltage circuit and has been caused instrument damage, thereby played protective effect.
2, when instrument high-voltage output line misconnection ground, in the moment of closing power switch device, triode Q1 and Q2 obtain biasing and conducting, relay J 1 action, J1-1 closure, drag down the base potential of triode Q3, make triode Q3 remain off state, while J1-2 closure, J6 action, pressure regulator once disconnects, and can't produce high pressure output.
3, when the normally opened contact J2-1 of relay J 2 does not discharge under the situation of output high pressure, the 4th triode Q4 conducting, relay J 5 actions; contact J5-1 adhesive; make relay J 5 self-lockings, normally opened contact J5-3 is communicated with simultaneously, and normally closed contact J5-2 disconnects; make relay J 6 actions; thereby pressure regulator is once disconnected, can't produce high pressure output, and make the relay J 2, J4 can not energized; J2-1, J4-1 are in off-state, and protection instrument internal circuit is not damaged.
Relay J 2 and J4 all adopt high-voltage relay, and its contact load voltage is 14kV.
Claims (2)
1, a kind of dielectric loss tester with high pressure output misconnection ground defencive function, it is characterized in that, it is by the tester that is used for the tested media loss, misconnection ground decision circuitry and misconnection ground holding circuit are formed, described misconnection ground decision circuitry is made up of two triodes and first relay (J1), the first triode Q1 and the second triode Q2 are connected into two-stage amplifier and drive first relay (J1), the output terminal of this two-stage amplifier also connects power cathode through first normally opened contact (J1-1) of first relay (J1), and input end is successively through current-limiting resistance (R1), the normally opened contact (J2-1) of isolating diode (D1) and second relay (J2) connects the high-voltage output end of tester; Described misconnection ground holding circuit is made of three relays and the 3rd triode (Q3), and the coil of second relay (J2) connects direct supply through the normally closed contact (J3-1) of the 3rd relay (J3); Described the 3rd triode (Q3) is connected into common-emitter amplifier, the coil of the 3rd relay (J3) is its collector load, its base stage is provided with upper offset resistance (R4) and below-center offset electric capacity (C1), and connects power cathode through the normally opened contact (J1-1) of first relay (J1); The coil of the 4th relay (J4) connects direct supply through the normally opened contact (J3-2) of the 3rd relay (J3) and the normally closed contact (J1-3) of first relay (J1) successively, the high pressure output of its normally opened contact (J4-1) control tester.
2, according to the described dielectric loss tester of claim 1 with high pressure output misconnection ground defencive function, it is characterized in that, set up high tension protection circuit, described high tension protection circuit is made up of two relays and the 4th triode (Q4), the 4th triode (Q4) is connected into common-emitter amplifier, the coil of the 5th relay (J5) is its collector load, its base stage is successively through repeating resistance (R5), the normally opened contact (J2-1) of voltage stabilizing diode (D6) and second relay (J2) connects the high-voltage output end of tester, the collector of the 4th triode (Q4) also connects power cathode through first normally opened contact (J5-1) of the 5th relay (J5), and the normally closed contact (J5-2) of the 5th relay (J5) is series at second, in the current supply circuit of the 4th relay coil; The coil of the 6th relay (J6) connects direct supply through second normally opened contact (J1-2) of first relay (J1) and the normally closed contact (J5-2) of the 5th relay (J5) successively, and connects direct supply through the normally opened contact (J5-3) of the 5th relay (J5); The AC power of normally closed contact (J6-1) the control tester of the 6th relay (J6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201065573U CN201311460Y (en) | 2008-11-14 | 2008-11-14 | Dielectric loss tester with high-voltage output false ground protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201065573U CN201311460Y (en) | 2008-11-14 | 2008-11-14 | Dielectric loss tester with high-voltage output false ground protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201311460Y true CN201311460Y (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201065573U Expired - Fee Related CN201311460Y (en) | 2008-11-14 | 2008-11-14 | Dielectric loss tester with high-voltage output false ground protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201311460Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182270A (en) * | 2015-07-31 | 2015-12-23 | 华立仪表集团股份有限公司 | Device and method of electric energy meter voltage-withstand test |
| CN107422250A (en) * | 2017-09-08 | 2017-12-01 | 广东电网有限责任公司惠州供电局 | A kind of relay protection circuit integrity tester |
-
2008
- 2008-11-14 CN CNU2008201065573U patent/CN201311460Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105182270A (en) * | 2015-07-31 | 2015-12-23 | 华立仪表集团股份有限公司 | Device and method of electric energy meter voltage-withstand test |
| CN107422250A (en) * | 2017-09-08 | 2017-12-01 | 广东电网有限责任公司惠州供电局 | A kind of relay protection circuit integrity tester |
| CN107422250B (en) * | 2017-09-08 | 2023-05-05 | 广东电网有限责任公司惠州供电局 | Relay protection circuit integrity tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20090916 Termination date: 20141114 |
|
| EXPY | Termination of patent right or utility model |