CN204177906U - Polarity tester - Google Patents

Polarity tester Download PDF

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Publication number
CN204177906U
CN204177906U CN201420511678.1U CN201420511678U CN204177906U CN 204177906 U CN204177906 U CN 204177906U CN 201420511678 U CN201420511678 U CN 201420511678U CN 204177906 U CN204177906 U CN 204177906U
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CN
China
Prior art keywords
polarity
casing
lead
work
utility
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
Application number
CN201420511678.1U
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Chinese (zh)
Inventor
何世雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Changzhi Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Changzhi Power Supply Co of State Grid Shanxi Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Changzhi Power Supply Co of State Grid Shanxi Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201420511678.1U priority Critical patent/CN204177906U/en
Application granted granted Critical
Publication of CN204177906U publication Critical patent/CN204177906U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to current transformer testing device, is specially a kind of polarity tester.Solve line falling difficulty particularly unhandy technical matters under narrow environment when estimated current mutual inductor polarity is tested.A kind of polarity tester, comprises a casing; Casing internal is provided with a stabilized voltage supply, and the outer wall of casing is provided with pair of output, and two output terminals of described stabilized voltage supply to be connected with lead-out terminal respectively by inner lead and wire to be serially connected with a switch be positioned on outer shell outer wall.The utility model fundamentally discharges bimanualness, checks electric power polarity in work without the need to secondary, reduces error rate.Reduce work difficulty, be applicable to working in multiple environment.Also add loop measuring ability, can also solve some at work due to loop reason causes false judgment to cause waste of time.

Description

Polarity tester
Technical field
The utility model relates to current transformer testing device, is specially a kind of polarity tester.
Background technology
Current transformer (CT) is very important force device in electric system, and it will once be changed into secondary current supply protection by alternating flux, measure, be recorded the use such as ripple, metering by high-tension side big current.Because the polarity of protective relaying device to mutual inductor has different polar configurations requirements; if secondary current loop polarity connects instead; the phase place change 180 degree of secondary side will be made; thus cause the harm of protective device misoperation or refused action; if tripping will cause overstep tripping, time serious, go back entail dangers to equipment and personal safety.Therefore, correctly judge that the polarity correctness of 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 when running as equipment, and the polarity of current transformer is extremely important for the correct reliability service of protective relaying device.
Just work, in protection class certainly from the most basic point-polarity, up-flow.In original work, point-polarity constantly to contact with battery with two wires to reach on-off action; necessary bimanualness; and be sometimes easy in point-polarity positive and negative reversal connection, thus cause secondary wiring of current mutual inductor mistake, and then cause appearance difference stream to cause protection act to trip.Line falling each time again must 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 with 1.5 ~ 3V dry cell, its positive pole being 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, milliammeter pointer positively biased of being closed by K, pulls open rear milliammeter pointer negative bias, illustrating that mutual inductor is connected on termination on anode with the termination being connected on milliammeter anode is same polarity, and namely L1, K1 are same polarity and mutual inductor is subtractive polarity.Be additive polarity as the beat of pointer is contrary to the above.
Concrete grammar pointer multimeter is connected on mutual inductor secondary to export on 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 an input lead of " point " current transformer again with the positive pole of dry cell, one+(just) pulse current will be produced in mutual inductor primary circuit like this; Observe the indicator of pointer multimeter to which direction " skew " simultaneously, if the indicator of multimeter offsets from left to right from 0, general-purpose indicator " just opens ", illustrate that " current transformer one secondary input end " that access 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 offsets from right to left from 0, general-purpose indicator " counter open ", illustrate that " current transformer one secondary input end " that access 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
The utility model, for solving line falling difficulty particularly unhandy technical matters under narrow environment when estimated current mutual inductor polarity is tested, provides a kind of polarity tester.
The utility model adopts following technical scheme to realize: a kind of polarity tester, comprises a casing; Casing internal is provided with a stabilized voltage supply, and the outer wall of casing is provided with pair of output, and two output terminals of described stabilized voltage supply to be connected with lead-out terminal respectively by inner lead and wire to be serially connected with a switch be positioned on outer shell outer wall.
The transformer polarity testing device of traditional " in bulk " formula has been made hand-held by the utility model, and by electronic method measurement current transform er polarity, simple, intuitive, easy to operate.During concrete operations, multimeter and to-be-tested transformer adopt traditional wired mode, are then connected at the two ends of lead-out terminal of the present utility model with an output lead of current transformer; Observe the rotating rule of multimeter pointer in test, turn to the primary side that just can judge to-be-tested transformer and secondary side to be same polarity or reversed polarity according to the positive-negative polarity of the lead-out terminal set in conjunction with the pointer of above-mentioned multimeter.
The utility model drastically increases work efficiency.No matter be produce or debug all there is irreplaceable effect.
Further, casing internal 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 the audible-visual annunciator that is arranged on casing internal.
The electric signal of the comparer established in single-chip microcomputer to the resistance value received compares judgement, and judge according to pre-set threshold value, when resistance value is greater than threshold value, single-chip microcomputer will export corresponding signal to audible-visual annunciator, and audible-visual annunciator sends signal and reminds the open circuit of staff's circuit under test.
The polarity that mutual inductor polarity tester described in the utility model may be used for current transformer and voltage transformer (VT) judges, all right measure loop break-make, improves work efficiency at work and reduce error rate.Loop detection module (generally also crying loop resistance measurement) principle and mode of connection are the known technology of those skilled in the art, and those skilled in the art can select to select rational circuit layout to complete corresponding surveying work as required.
The utility model is applicable to some narrow spaces, bad environments, in restricted larger working environment; Its small in volume, portable, do not need additional power supply, the requirement of work on the spot portability can be met.
The beneficial effects of the utility model: 1, adopt DC voltage measurement method, small in volume, portable, meet the requirement of work on the spot portability.2, voltage waveform is produced by Single Chip Microcomputer (SCM) program, totally pure, eliminates electrical network interference.3, inner employing constant pressure source, stable reading.4, electronic method measurement current transform er polarity, simple, intuitive.
The utility model fundamentally releases bimanualness, checks electric power polarity in work without the need to secondary, reduces error rate.Reduce work difficulty, be applicable to working in multiple environment.Also add loop measuring ability, some can also be avoided at work to cause false judgment to cause the situation of time waste to occur due to loop reason.
Accompanying drawing explanation
Fig. 1 the utility model external structure schematic diagram.
Fig. 2 the utility model internal circuit connection diagram.
The structural representation of Fig. 3 the utility model loop detection module.
Fig. 4 Traditional DC method surveys structural representation during 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, and two output terminals of described stabilized voltage supply 2 to be connected with lead-out terminal 3 respectively by inner lead and wire to be serially connected with a switch 4 be 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 the audible-visual annunciator 7 that is arranged on casing 1 inside.
Fig. 1 can find out that two output terminal 3 are arranged on the front end of casing 1, facilitates when testing and the connection of to-be-tested transformer; Switch 4 and button 8 are also located on casing, are convenient to control internal electric source or circuit; Chassis body is divided into two parts, and with vertical line in Fig. 1 for boundary, the left side is as measuring junction, and the right is then 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 externally to-be-tested transformer or other equipment is powered, the electric current flowing 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 received to corresponding resistance value, the comparer established in single-chip microcomputer compares the resistance value measured and the threshold value preset, if testing resistance value is greater than threshold value, then exports corresponding signal control audible-visual annunciator and send alerting signal.
Table 1 is advantage of the present utility model.
Polarity tester can be controlled by people's one hand during work, the interface (lead-out terminal) of tester be the easy for installation and tester of the interface of General experimental line positive and negative be determine and have obvious sign, often can occur in work that loop is obstructed and not have Timeliness coverage to have impact on the process of work at that time, and then the function of update device, then allow now it have loop self-checking function.The obstructed automatic alarm in loop reminds staff to reduce unnecessary work in time.The utility model has the features such as functional reliability is high, easy and simple to handle, small volume and less weight, and increase work efficiency, be the high-tech product that a kind of cost performance is higher simultaneously.The surface of casing 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), and two output terminals of described stabilized voltage supply (2) to be connected with lead-out terminal (3) respectively by inner lead and wire to be serially connected with a switch (4) be positioned on shell (1) outer wall.
2. polarity tester as claimed in claim 1, it is characterized in that, casing (1) inside is also provided with a loop detection module (5); Two output terminals in 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).
CN201420511678.1U 2014-09-05 2014-09-05 Polarity tester Expired - Fee Related CN204177906U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420511678.1U CN204177906U (en) 2014-09-05 2014-09-05 Polarity tester

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420511678.1U CN204177906U (en) 2014-09-05 2014-09-05 Polarity tester

Publications (1)

Publication Number Publication Date
CN204177906U true CN204177906U (en) 2015-02-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420511678.1U Expired - Fee Related CN204177906U (en) 2014-09-05 2014-09-05 Polarity tester

Country Status (1)

Country Link
CN (1) CN204177906U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104198879A (en) * 2014-09-05 2014-12-10 国家电网公司 Polarity tester
CN104808067A (en) * 2015-05-13 2015-07-29 国家电网公司 Multifunctional digital CT (Computed Tomography) secondary detector

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104198879A (en) * 2014-09-05 2014-12-10 国家电网公司 Polarity tester
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

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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
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150225

Termination date: 20180905