CN204925370U - Single, three -phase direct current return circuit resistance meter calibrating installation - Google Patents
Single, three -phase direct current return circuit resistance meter calibrating installation Download PDFInfo
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- CN204925370U CN204925370U CN201520209641.8U CN201520209641U CN204925370U CN 204925370 U CN204925370 U CN 204925370U CN 201520209641 U CN201520209641 U CN 201520209641U CN 204925370 U CN204925370 U CN 204925370U
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- 238000001514 detection method Methods 0.000 description 11
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 238000004088 simulation Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
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Abstract
The utility model belongs to the technical field of send the transformer technique and specifically relates to a single, three -phase direct current return circuit resistance meter calibrating installation is related to. First etalon and second etalon, the third etalon adopts star type area neutral point to connect, the C2 contact of C2 contact and the second etalon of first etalon and the C2 contact connection of third etalon promptly, the C1 contact lead -out wire of first etalon is A, P1 contact lead -out wire is a, the C1 contact lead -out wire of second etalon is B, P1 contact lead -out wire is b, the C1 contact lead -out wire of third etalon is C, P1 contact lead -out wire is c, the neutral lead is O and o. The utility model discloses an advantage: 1, disposable wiring accomplish 3 directly hinder the appearance mutually, the single -phase multiple spot that directly hinders appearance, return circuit appearance detects, including current value, resistance value, resolution ratio, electric current leading indicator such as overshoot, 2, resistance can electrified continuously adjustable, 3, the resistance scope is wide, and stability is high.
Description
Technical field
The utility model relates to and send power transformation technology field, specifically relates to a kind of single, three-phase dc circuit resistance tester calibrating installation.
Background technology
In the market always cannot direct-detection for three-phase dc transformer resistance tester, when three-phase transformer direct current resistance/circuit resistance tester measurement electric current is larger or measurement resistance value ratio is larger, resistance in kind can produce a large amount of heats, the resistance of resistance in kind can change with the rising of temperature, causes the inaccurate of measurement result.Calibrating in the market for 3 phase transformer instrument for measuring DC resistance is generally examine and determine its single channel function, or be concatenated into 3 phase transformer structures with several resistance in kind and examine and determine, multiple spot detection cannot be carried out, and wiring also bothers, complete a point and just must change resistance and rewiring, workload heavy but also calibrating comprehensive not.Because the manufacturer of direct resistance metering instrument is in the market a lot, and a lot of producer does not have clear and definite specification in process of production, the product of each manufacturer production is caused to there is a lot of difference in function and interface, perhaps in measurement resistance process in kind, there is not any problem, but measure analog resistance process may exist the incompatible problem of interface, current range not to current terminal, the unmatched problem of potential end voltage, cause measure inaccurate.
Problem 1, a lot of producer are in process of production in order to measure conveniently, the electric current gear of tester is designed to automatic range, this conflicts mutually with the fixed current range of artifical resistance, thus (in fact automatic current range seems and is convenient for measuring to cause trouble, but because its electric current determines according to load, thus can not being estimated by electric current logical on real product of the different resistance of different materials may be caused, test specimen may be damaged, so itself be irrational, this also have in new code relate to).
Problem 2, current terminal potential end voltage do not mate; thus test specimen protection may be caused to start; when measuring resistance in kind, current terminal current potential is always high than voltage end current potential, and this affirms very much; but when measure analog resistance; load due to current terminal is fixing, so when setting resistance higher than certain value, just may there is voltage end current potential higher than electric current end points position; from measurement resistance in kind be occurs different judgements, may cause some producer test specimen protection startup.Cannot measure.
Problem 3, output interface incompatible initiation artifical resistance device exports concussion, thus causes measuring error.
Summary of the invention
The technical problems to be solved in the utility model is the deficiency existed for prior art, there is provided one can simultaneously to 3 phase transformer instrument for measuring DC resistance carry out 3 identical time detect, and accomplish single, three-phase dc circuit resistance tester calibrating installation that 3 phase resistances can regulate arbitrarily in scope.
The utility model is a kind of single, three-phase dc circuit resistance tester calibrating installation is achieved by following technical proposals: Yi Zhongdan, three-phase dc circuit resistance tester calibrating installation comprises three-phase dc transformer resistance tester, first standard, second standard, 3rd standard, the first described standard and the second standard, 3rd standard adopts star-like band neutral point to connect, namely the C2 contact of the first standard is connected with the C2 contact of the C2 contact of the second standard and the 3rd standard, the C1 contact outgoing line of the first standard is A, P1 contact outgoing line is a, the C1 contact outgoing line of the second standard is B, P1 contact outgoing line is b, the C1 contact outgoing line of the 3rd standard is C, P1 contact outgoing line is c, neutral lead is O and o.
A kind of list of the utility model, three-phase dc circuit resistance tester calibrating installation have following beneficial effect compared with prior art: the utility model is mainly used in the detection of three-phase transformer instrument for measuring DC resistance, solve the problem that current three-phase transformer instrument for measuring DC resistance cannot detect accurately, easily, greatly reduce the labour intensity of detection person, increase work efficiency.Mainly set forth the measuring method completing resistance under big current, full test electric current can reach 600A, and maximum resistance can to 60 Europe, and resistance accuracy can reach 0.02 grade, and current measurement accuracy can reach 0.05 grade; Propose the concrete measure improving indices, technique have employed 4 line formula electric resistance structures and avoid the measuring error going between and resistance is caused, the inner current comparator that adopts as current sample element, thus overcomes the situation that big current heating causes resistance instability; Give the measuring method that disposablely can complete three-phase dc transformer resistance tester in resistance measurement first especially.
A kind of single, three-phase dc circuit resistance tester calibrating installation of the utility model solves detection never this technical matters of reasonable method three-phase directly being hindered to instrument, improve gage work quality, accurately test specimen is more fully detected, get rid of possibility Problems existing more accurately thus reduce and may cause power failure; Also greatly alleviate work difficulty in gage work process, disposable wiring completes major part and measures, and greatly increases work efficiency simultaneously.
Accompanying drawing explanation
A kind of list of the utility model, three-phase dc circuit resistance tester calibrating installation have following accompanying drawing:
Fig. 1 is a kind of single, the electrical block diagram that 3 instrument for measuring DC resistance examined and determine by three-phase dc circuit resistance tester calibrating installation of the utility model;
Fig. 2 is a kind of single, three-phase dc circuit resistance tester calibrating installation calibrating individual event instrument for measuring DC resistance electrical block diagram of the utility model;
Fig. 3 is a kind of single, three-phase dc circuit resistance tester calibrating installation separate unit standard electrical block diagram of the utility model;
Fig. 4 is a kind of single, three-phase dc circuit resistance tester calibrating installation instrument for measuring DC resistance contour structures schematic diagram of the utility model;
Fig. 5 is a kind of single, three-phase dc circuit resistance tester calibrating installation mounting structure schematic diagram of the utility model;
Fig. 6 is a kind of single, three-phase dc circuit resistance tester calibrating installation rear connection structural representation of the utility model.
Wherein: 1, instrument for measuring DC resistance; 2, the first standard; 3, the second standard; 4, the 3rd standard; 5, Y-connection line.
Embodiment
Below in conjunction with drawings and Examples, a kind of list of the utility model, three-phase dc circuit resistance tester calibrating installation technical scheme are further described.
As shown in Figure 1-Figure 3, the utility model is a kind of single, three-phase dc circuit resistance tester calibrating installation comprises three-phase dc transformer resistance tester 1, first standard 2, second standard 3, 3rd standard 4, the first described standard 2 and the second standard 3, 3rd standard 4 adopts star-like band neutral point to connect, namely the C2 contact of the first standard 2 is connected with the C2 contact of the C2 contact of the second standard 3 and the 3rd standard 4, the C1 contact outgoing line of the first standard 2 is A, P1 contact outgoing line is a, the C1 contact outgoing line of the second standard 3 is B, P1 contact outgoing line is b, the C1 contact outgoing line of the 3rd standard 4 is C, P1 contact outgoing line is c, neutral lead is O and o.
Further, the first described standard 2, second standard 3 is connected with the IA of DC loop resistance meter with the A contact of the 3rd standard 4 first standard 2 when examining and determine three-phase dc circuit resistance tester, a contact is connected with the VA of DC loop resistance meter, the B contact of the second standard 3 is connected with the IB of DC loop resistance meter, b contact is connected with the VB of DC loop resistance meter, the C contact of the 3rd standard 4 is connected with the IC of DC loop resistance meter, and c contact is connected with the VC of DC loop resistance meter.
Further, the neutral lead when examining and determine three-phase dc circuit resistance tester of the first described standard 2, second standard 3 and the 3rd standard 4 is that O is connected with the IO of DC loop resistance meter, and neutral lead o is connected with the VO of DC loop resistance meter.
Further, the first described standard 2, second standard 3 and the 3rd standard 4 are when examining and determine single-phase DC circuit resistance tester, and standard is the standard adjustable resistor of 4 ends, wherein 2 current terminals I-, I+, 2 potential ends V-, V+.
Embodiment 1.
A kind of single, described in three-phase dc circuit resistance tester calibrating installation the first standard 2 of the utility model adopts star-like band neutral point to be connected with the second standard 3, the 3rd standard 4, namely the C2 contact of the first standard 2 is connected with the C2 contact of the C2 contact of the second standard 3 and the 3rd standard 4, the C1 contact outgoing line of the first standard 2 is A, P1 contact outgoing line is a, the C1 contact outgoing line of the second standard 3 is B, P1 contact outgoing line is b, the C1 contact outgoing line of the 3rd standard 4 is C, P1 contact outgoing line is c, and neutral lead is O and o.
Preferably, the first described standard 2, second standard 3 is connected with the IA of DC loop resistance meter with the A contact of the 3rd standard 4 first standard 2 when examining and determine three-phase dc circuit resistance tester, a contact is connected with the VA of DC loop resistance meter, the B contact of the second standard 3 is connected with the IB of DC loop resistance meter, b contact is connected with the VB of DC loop resistance meter, the C contact of the 3rd standard 4 is connected with the IC of DC loop resistance meter, and c contact is connected with the VC of DC loop resistance meter.
Preferably, the neutral lead when examining and determine three-phase dc circuit resistance tester of the first described standard 2, second standard 3 and the 3rd standard 4 is that O is connected with the IO of DC loop resistance meter, and neutral lead o is connected with the VO of DC loop resistance meter.
Preferably, the first described standard 2, second standard 3 and the 3rd standard 4 are when examining and determine single-phase DC circuit resistance tester, and standard is the standard adjustable resistor of 4 ends, wherein 2 current terminals I-, I+, 2 potential ends V-, V+.
Carried out 3 phase instrument for measuring DC resistance with 3 standards, this kind of wiring is used for detecting Y type winding, and for avoiding lead-in wire to cause measuring error during measurement, the C2 connecting line 5 of 3 standards adopts the wire of tubbiness to connect, as shown in Fig. 1, Fig. 6.
The C1 contact outgoing line A of the first standard 2, P1 contact outgoing line a connects IA and the VA binding post of accredited DC Resistance of Transformer/circuit resistance tester, the C1 contact outgoing line B of the second standard 3, P1 contact outgoing line b connects IB and the VB binding post of accredited DC Resistance of Transformer/circuit resistance tester, the C1 contact outgoing line C of the 3rd standard 4, P1 contact outgoing line Cl connects IC and the VC binding post of accredited DC Resistance of Transformer/circuit resistance tester, neutral lead O and o connects IO and the VO binding post of accredited DC Resistance of Transformer/circuit resistance tester respectively.As shown in Figure 1, shown in Figure 5.
Standard can regard the standard adjustable resistor of 4 ends as, 2 current terminals, 2 potential ends, resistive band electricity continuously adjustabe.
The structure of standard as shown in Figure 3, adopt mutual inductor as shown in Figure 3 that electric current I 1 is converted to I2, again I2 is added on a standard resistance box R, obtain the voltage V on intermediate point resistance R, adopt current comparator namely to refer to mutual inductor technology, electric current I 1 is converted to I2, again I2 is added on a standard resistance box, obtain the voltage V on intermediate point resistance R, assuming that the ratio of comparator is the ratio of N/1 and I1 and I2, namely have:
V=I1×R/N，
According to Ohm law, R=U/I, package unit is regarded as a measuring resistance by us, just has resistance=R/N that we simulate out
As can be seen from formula above, we change the resistance of R from small to large by swept resistance case, can realize resistance continuously adjustabe, thus simulate a series of resistance by a resistor, realize multiple spot and detect.
And the proportionate relationship N of our suitable change comparator namely once with the ratio of secondary, the namely turn ratio of mutual inductor, just can reduce the current value of I2, the power of resistance box just can drop to very low, so the big current heating problem of this cover simulation resistance device has nothing to do with standard resistance box, only relevant with comparator, and our usual comparator adopts magnetic induction principle, substantially also primary current heating problem can be ignored, in sum, level is (concerning comparator technology, the conductor overheating caused by primary current thus the error change of the comparator caused can control substantially within 0.005 grade) namely this cover simulation resistance device refer to that standard can overcome the problem that under big current, resistance is unstable and resistance is not high completely, thus substantially increase the scope of resistance and the stability of resistance.
During actual detection, the big current I that DC Resistance of Transformer/circuit resistance tester exports
2small area analysis I is become through DC current transducer
1, small area analysis I
1flow through the resistance in kind that a resistance is 1 Ω, the voltage V at resistance two ends in kind
1=I1 × R1.Then resistance two ends access voltage power amplifier unit in kind, by resistance R in kind
1both end voltage V
1amplify and obtain voltage V
2, wherein, DC current transducer conversion multiple and voltage power amplifier unit enlargement factor reciprocal each other, instrument gathers voltage V automatically
2with big current I
2numerical value, draw artifical resistance resistance R according to Ohm law
2=V
2/ I
2.
During actual detection, resistance R in kind
1thermal value Q
1=I
1 2r
1, due to small area analysis I
1by big current I
2through coming of DC current transducer conversion, small area analysis I
1be far smaller than big current I
2, resistance R in kind
1thermal value Q
1negligible, eliminate thermal value to the impact of resistance in kind, realize the high precision test of DC Resistance of Transformer/circuit resistance tester.
In order to realize the detection of the multiple check point of DC Resistance of Transformer/circuit resistance tester, just need the resistance of resistance R1 in kind can charged continuous adjustment.With reference to the principle of DC resistance box, replace resistance R1 in kind with a resistance box, realize the charged continuous regulatory function of resistance R1 resistance in kind, ensure that the detection of the multiple check point of DC Resistance of Transformer/circuit resistance tester.
For realizing the detection of three-phase transformer direct current resistance/circuit resistance tester, get 3 above-mentioned artifical resistance unit, carry out integrated, the connected mode between 3 artifical resistance unit is changed by external knob, three kinds of modes of connection of analogue transformer winding, thus omnibearing detection is realized to three-phase transformer direct current resistance/circuit resistance tester.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. a list, three-phase dc circuit resistance tester calibrating installation, comprise three-phase dc transformer resistance tester (1), first standard (2), second standard (3), 3rd standard (4), it is characterized in that: described the first standard (2) and the second standard (3), 3rd standard (4) adopts star-like band neutral point to connect, namely the C2 contact of the first standard (2) is connected with the C2 contact of the C2 contact of the second standard (3) and the 3rd standard (4), the C1 contact outgoing line of the first standard (2) is A, P1 contact outgoing line is a, the C1 contact outgoing line of the second standard (3) is B, P1 contact outgoing line is b, the C1 contact outgoing line of the 3rd standard (4) is C, P1 contact outgoing line is c, neutral lead is O and o.
2. list according to claim 1, three-phase dc circuit resistance tester calibrating installation, it is characterized in that: described the first standard (2), second standard (3) is connected with the IA of DC loop resistance meter with the A contact of the 3rd standard (4) first standard (2) when examining and determine three-phase dc circuit resistance tester, a contact is connected with the VA of DC loop resistance meter, the B contact of the second standard (3) is connected with the IB of DC loop resistance meter, b contact is connected with the VB of DC loop resistance meter, the C contact of the 3rd standard (4) is connected with the IC of DC loop resistance meter, c contact is connected with the VC of DC loop resistance meter.
3. single, three-phase dc circuit resistance tester calibrating installation according to claim 1, it is characterized in that: the neutral lead when examining and determine three-phase dc circuit resistance tester of described the first standard (2), the second standard (3) and the 3rd standard (4) is that O is connected with the IO of DC loop resistance meter, and neutral lead o is connected with the VO of DC loop resistance meter.
4. single, three-phase dc circuit resistance tester calibrating installation according to claim 1, it is characterized in that: described the first standard (2), the second standard (3) and the 3rd standard (4) are when examining and determine single-phase DC circuit resistance tester, standard is the standard adjustable resistor of 4 ends, wherein 2 current terminals I-, I+, 2 potential ends V-, V+.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520209641.8U CN204925370U (en) | 2015-04-09 | 2015-04-09 | Single, three -phase direct current return circuit resistance meter calibrating installation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520209641.8U CN204925370U (en) | 2015-04-09 | 2015-04-09 | Single, three -phase direct current return circuit resistance meter calibrating installation |
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| CN204925370U true CN204925370U (en) | 2015-12-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865546A (en) * | 2015-04-09 | 2015-08-26 | 国家电网公司 | Single and three-phase DC loop resistance tester calibrating device |
| CN105891759A (en) * | 2016-05-10 | 2016-08-24 | 北京无线电计量测试研究所 | Method and equipment for determining transmission line standard device and calibration equipment |
-
2015
- 2015-04-09 CN CN201520209641.8U patent/CN204925370U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865546A (en) * | 2015-04-09 | 2015-08-26 | 国家电网公司 | Single and three-phase DC loop resistance tester calibrating device |
| CN105891759A (en) * | 2016-05-10 | 2016-08-24 | 北京无线电计量测试研究所 | Method and equipment for determining transmission line standard device and calibration equipment |
| CN105891759B (en) * | 2016-05-10 | 2018-08-14 | 北京无线电计量测试研究所 | A kind of determination method, equipment and the calibrator (-ter) unit of transmission line normal component |
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