CN104198879A - Polarity tester - Google Patents
Polarity tester Download PDFInfo
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- CN104198879A CN104198879A CN201410451876.8A CN201410451876A CN104198879A CN 104198879 A CN104198879 A CN 104198879A CN 201410451876 A CN201410451876 A CN 201410451876A CN 104198879 A CN104198879 A CN 104198879A
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- polarity
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Abstract
The invention relates to a current transformer testing device and specifically relates to a polarity tester. The polarity tester is used for solving the technical problems of difficult wire inversion and inconvenient operation especially in a narrow environment during the polarity test of a current transformer at present. The polarity tester comprises a housing; a voltage-stabilized power source is arranged inside the housing; a pair of output terminals is arranged on the outer wall of the housing; the two output ends of the are connected with the output terminals by use of internal leads, respectively, and a switch located on the outer wall of the housing is connected in series with the leads. The polarity tester has the advantages that the two-hand operations are freed fundamentally, secondary power polarity checking during working is not required and the error rate is reduced. The working difficulty is reduced; the polarity tester is suitable for working in various environments. Besides, the polarity tester is additionally provided with a circuit detection function so that the waste of time due to misjudgment caused by circuit reasons during working also can be avoided.
Description
Technical field
The present invention relates to current transformer testing device, be specially a kind of polarity tester.
Background technology
Current transformer (CT) is very important force device in electric system, it will be once on high-tension side large electric current change the uses such as secondary current is supplied with protection, measured, record ripple, metering into by alternating flux.Because protective relaying device has different polar configurations requirements to the polarity of mutual inductor; if secondary current loop polarity connects instead; will make the phase place of secondary side change 180 degree; thereby the harm that causes protective device misoperation or tripping to do; if tripping will cause overstep tripping, when serious, go back entail dangers to equipment and personal safety.Therefore the polarity correctness that, correctly judges current transformer is a very important job.The secondary line of current transformer is linked into protective relaying device, the important evidence of failure judgement while operation as equipment, and the polarity of current transformer is extremely important for the correct reliability service of protective relaying device.
Just work, certain from the most basic point-polarity, up-flow in protection class.In original work, point-polarity is constantly to contact and reach on-off action with battery with two wires; necessary bimanualness; and sometimes in point-polarity, be easy to positive and negative reversal connection, thereby cause secondary wiring of current mutual inductor mistake, and then cause the poor stream of appearance to cause protection action tripping operation.Line falling each time must again be checked positive-negative polarity or people's line falling one people and take battery, falls that primary circuit is obstructed must check loop problem, inefficiency and losing time.
Traditional polarity test method is as shown in Figure 4: the primary winding L1 that with 1.5～3V dry cell, its positive pole is connected to mutual inductor, L2 connects negative pole, the secondary side K1 of mutual inductor connects milliammeter positive pole, negative pole meets K2, after carefully connecting the wire, by the K milliammeter pointer positively biased of closing, pull open rear milliammeter pointer negative bias, illustrate that the termination that mutual inductor is connected on anode is same polarity with the termination that is connected on milliammeter anode, L1, K1 are that same polarity is that mutual inductor is subtractive polarity.Be additive polarity as the beat of pointer is contrary to the above.
Concrete grammar is that pointer multimeter is connected on mutual inductor secondary output winding, and multimeter is beaten at shelves of direct voltage; Then the negative pole of a joint dry cell is fixed on an output lead of current transformer; Remove again an input lead of " point " current transformer with the positive pole of dry cell, will produce like this one+(just) pulse current in mutual inductor primary circuit; Observe the indicator of pointer multimeter to which direction " skew " simultaneously, if the indicator of multimeter is from 0 skew from left to right, general-purpose indicator " just opens ", " current transformer one secondary input end " that access is described is Same Name of Ends with " the Current Transformer Secondary output terminal that pointer multimeter positive terminal is connected ", and this wiring is just called positive polarity.If the indicator of multimeter is from 0 skew from right to left, general-purpose indicator " counter opening ", " current transformer one secondary input end " that access is described is not Same Name of Ends with " the Current Transformer Secondary output terminal that pointer multimeter positive terminal is connected ", and this wiring is just called reversed polarity.
Summary of the invention
When the present invention tests for solving estimated current mutual inductor polarity, particularly unhandy technical matters under narrow environment of line falling difficulty, provides a kind of polarity tester.
The present invention adopts following technical scheme to realize: a kind of polarity tester, comprises a casing; Casing inside is provided with a stabilized voltage supply, and the outer wall of casing is provided with pair of output, two output terminals of described stabilized voltage supply be connected with lead-out terminal by inner lead respectively and wire on be serially connected with a switch being positioned on outer shell outer wall.
The transformer polarity testing device of traditional " in bulk " formula has been made hand-held by the present invention, and measure current transformer polarity by electronic method, and simple, intuitive is easy to operate.When concrete operations, multimeter and to-be-tested transformer adopt traditional wired mode, then lead-out terminal of the present invention are connected with the two ends of an output lead of current transformer; In test, observe the rotating rule of multimeter pointer, turning in conjunction with the pointer of above-mentioned multimeter primary side and the secondary side that just can judge to-be-tested transformer according to the positive-negative polarity of the lead-out terminal having set is same polarity or reversed polarity.
The present invention has greatly improved work efficiency.Produce or debug all to there is irreplaceable effect no matter be.
Further, casing inside is also provided with a loop detection module; Two output terminals of described loop detection module are connected with two lead-out terminals respectively by wire; Loop detection module includes testing circuit and single-chip microcomputer, and the signal output part of testing circuit is connected with the signal input part of single-chip microcomputer, and the signal output part of single-chip microcomputer is connected with an audible-visual annunciator that is arranged on casing inside.
The comparer of establishing in single-chip microcomputer compares judgement to the electric signal of the resistance value receiving, and judge according to pre-set threshold value, in the time that resistance value is greater than threshold value, single-chip microcomputer will be exported corresponding signal to audible-visual annunciator, and audible-visual annunciator sends signal and reminds staff's circuit under test to open circuit.
Mutual inductor polarity tester of the present invention can, for the polarity judgement of current transformer and voltage transformer (VT), can also detect loop break-make, has improved at work work efficiency and has reduced error rate.Loop detection module (generally also crying loop resistance measurement) principle and mode of connection are those skilled in the art's known technology, and those skilled in the art can select to select as required rational circuit layout to complete corresponding surveying work.
The present invention is applicable to some narrow spaces, environment is severe, in restricted larger working environment; Its volume is little lightweight, portable, does not need additional power supply, can meet the requirement of work on the spot portability.
Beneficial effect of the present invention: 1, adopt DC voltage measurement method, volume is little lightweight, portable, meets the requirement of work on the spot portability.2, voltage waveform is produced by Single Chip Microcomputer (SCM) program, totally pure, has exempted electrical network interference.3, inner constant pressure source, the stable reading of adopting.4, electronic method is measured current transformer polarity, simple, intuitive.
The present invention has fundamentally discharged bimanualness, in work, checks electric power polarity without secondary, reduces error rate.Reduce work difficulty, be applicable to working in multiple environment.Also add loop measuring ability, can also avoid at work some to cause the situation of time waste to occur because loop reason causes false judgment.
Brief description of the drawings
Fig. 1 external structure schematic diagram of the present invention.
Fig. 2 internal circuit connection diagram of the present invention.
The structural representation of Fig. 3 loop of the present invention detection module.
Structural representation when Fig. 4 tradition DC-method is surveyed mutual inductor polarity.
1-casing, 2-stabilized voltage supply, 3-lead-out terminal, 4-switch, 5-loop detection module, 6-single-chip microcomputer, 7-audible-visual annunciator, 8-button.
Embodiment
A kind of polarity tester, comprises a casing 1; Casing 1 inside is provided with a stabilized voltage supply 2, and the outer wall of casing 1 is provided with pair of output 3, two output terminals of described stabilized voltage supply 2 be connected with lead-out terminal 3 by inner lead respectively and wire on be serially connected with a switch 4 being positioned on shell 1 outer wall.
Casing 1 inside is provided with a loop detection module 5; Two output terminals of described loop detection module 5 are connected with two lead-out terminals 3 respectively by wire; Loop detection module 5 includes testing circuit and single-chip microcomputer 6, and the signal output part of testing circuit is connected with the signal input part of single-chip microcomputer 6, and the signal output part of single-chip microcomputer 6 is connected with an audible-visual annunciator 7 that is arranged on casing 1 inside.
Fig. 1 can find out that two output terminal 3 sons are arranged on the front end of casing 1, when convenient test with being connected of to-be-tested transformer; Switch 4 and button 8 are also located on casing, are convenient to internal electric source or circuit to control; Chassis body is divided into two parts, and taking vertical line in Fig. 1 as boundary, the left side is as measuring junction, and the right is handheld terminal; In Fig. 2, loop detection module is in parallel with stabilized voltage supply 2.
Fig. 3 is the structured flowchart of loop detection module, and single-chip microcomputer signal output part is connected with constant current source programme control circut, high power constant-current source module and constant current source output control module in turn; Constant current source output control module is to outside to-be-tested transformer or the power supply of other equipment, the electric current that flows through tested mutual inductor inputs to single-chip microcomputer 6 through 14 A/D data acquisition system (DAS)s, single-chip microcomputer 6 is also connected with standard sample resistance, single-chip microcomputer 6 can convert the current signal receiving to corresponding resistance value, the comparer of establishing in single-chip microcomputer compares the resistance value measuring and predefined threshold value, if testing resistance value is greater than threshold value, exports corresponding signal control audible-visual annunciator and send alerting signal.
Table 1 is advantage of the present invention.
When work, can control polarity tester by people's one hand, the interface (lead-out terminal) of tester be the easy for installation and tester of the interface of general experiment line positive and negative be determine and have an obvious sign, in work, can often occur that loop is obstructed and there is no at that time to have found in time to have affected the process of work, and then the function of update device, allow now it have loop self-checking function.The obstructed automatic alarm in loop reminds staff to reduce unnecessary work in time.The present invention has the features such as functional reliability is high, easy and simple to handle, small volume and less weight, increases work efficiency simultaneously, and be the high-tech product that a kind of cost performance is higher.The surface of casing 1 is provided with the button 8 of control loop detection module break-make.
Claims (2)
1. a polarity tester, is characterized in that, comprises a casing (1); Casing (1) inside is provided with a stabilized voltage supply (2), the outer wall of casing (1) is provided with pair of output (3), two output terminals of described stabilized voltage supply (2) be connected with lead-out terminal (3) by inner lead respectively and wire on be serially connected with a switch (4) being positioned on shell (1) outer wall.
2. polarity tester as claimed in claim 1, is characterized in that, casing (1) inside is also provided with a loop detection module (5); Two output terminals of described loop detection module (5) are connected with two lead-out terminals (3) respectively by wire; Loop detection module (5) includes testing circuit and single-chip microcomputer (6), the signal output part of testing circuit is connected with the signal input part of single-chip microcomputer (6), and the signal output part of single-chip microcomputer (6) is connected with one and is arranged on the inner audible-visual annunciator (7) of casing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410451876.8A CN104198879A (en) | 2014-09-05 | 2014-09-05 | Polarity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410451876.8A CN104198879A (en) | 2014-09-05 | 2014-09-05 | Polarity tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104198879A true CN104198879A (en) | 2014-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410451876.8A Pending CN104198879A (en) | 2014-09-05 | 2014-09-05 | Polarity tester |
Country Status (1)
| Country | Link |
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| CN (1) | CN104198879A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808067A (en) * | 2015-05-13 | 2015-07-29 | 国家电网公司 | Multifunctional digital CT (Computed Tomography) secondary detector |
| CN104898016A (en) * | 2015-06-26 | 2015-09-09 | 国家电网公司 | Device for checking secondary circuit and polarity of current transformer |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN109782070A (en) * | 2019-03-08 | 2019-05-21 | 大唐东营发电有限公司 | A kind of method of PT test short-circuit impedance |
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| CN101363895A (en) * | 2008-09-27 | 2009-02-11 | 河南电力试验研究院 | Method and system for detecting DC loop fault |
| CN101581749A (en) * | 2008-05-16 | 2009-11-18 | 北大方正集团有限公司 | Method and system for circuit test of printed circuit board |
| CN201804071U (en) * | 2010-08-20 | 2011-04-20 | 嵩县电业局 | Polarity tester for current transformer |
| CN202421409U (en) * | 2011-12-21 | 2012-09-05 | 洛宁供电公司 | Portable polarity tester for mutual inductors |
| CN202994954U (en) * | 2012-12-24 | 2013-06-12 | 宁夏电力公司中卫供电局 | Portable polarity tester |
| CN204177906U (en) * | 2014-09-05 | 2015-02-25 | 国家电网公司 | Polarity tester |
-
2014
- 2014-09-05 CN CN201410451876.8A patent/CN104198879A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581749A (en) * | 2008-05-16 | 2009-11-18 | 北大方正集团有限公司 | Method and system for circuit test of printed circuit board |
| CN101363895A (en) * | 2008-09-27 | 2009-02-11 | 河南电力试验研究院 | Method and system for detecting DC loop fault |
| CN201804071U (en) * | 2010-08-20 | 2011-04-20 | 嵩县电业局 | Polarity tester for current transformer |
| CN202421409U (en) * | 2011-12-21 | 2012-09-05 | 洛宁供电公司 | Portable polarity tester for mutual inductors |
| CN202994954U (en) * | 2012-12-24 | 2013-06-12 | 宁夏电力公司中卫供电局 | Portable polarity tester |
| CN204177906U (en) * | 2014-09-05 | 2015-02-25 | 国家电网公司 | Polarity tester |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808067A (en) * | 2015-05-13 | 2015-07-29 | 国家电网公司 | Multifunctional digital CT (Computed Tomography) secondary detector |
| CN104808067B (en) * | 2015-05-13 | 2019-04-19 | 国家电网公司 | Multifunctional digital CT secondary detection instrument |
| CN104898016A (en) * | 2015-06-26 | 2015-09-09 | 国家电网公司 | Device for checking secondary circuit and polarity of current transformer |
| CN108107314A (en) * | 2017-12-14 | 2018-06-01 | 国家电网公司 | A kind of polarity testing device of current transformer |
| CN109782070A (en) * | 2019-03-08 | 2019-05-21 | 大唐东营发电有限公司 | A kind of method of PT test short-circuit impedance |
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Application publication date: 20141210 |
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| RJ01 | Rejection of invention patent application after publication |