CN104730480A - Calibration device and system of split core type current transformer - Google Patents
Calibration device and system of split core type current transformer Download PDFInfo
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- CN104730480A CN104730480A CN201310706533.7A CN201310706533A CN104730480A CN 104730480 A CN104730480 A CN 104730480A CN 201310706533 A CN201310706533 A CN 201310706533A CN 104730480 A CN104730480 A CN 104730480A
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Abstract
The invention discloses a calibration device and system of a split core type current transformer. The calibration device of the split core type current transformer comprises a hanging rack, electric energy meter standard parts, testing rods and an electric energy meter calibration instrument, wherein the hanging rack is provided with a cross rod, a first supporting part, a second supporting part and fixing parts, the electric energy meter standard parts are used for providing stable testing current, the testing rods penetrate through the first supporting part, the second supporting part and the fixing parts, the two ends of each testing rod are both connected with the energy meter standard parts to form a testing loop for transmitting testing current, and the electric energy meter calibration instrument is connected with the electric energy meter standard parts and the split core type current transformer and is used for calculating and measuring electric energy amount according to the testing current detected by the split core type current transformer and feeding back the electric energy amount to the electric energy meter standard part. By means of the calibration device and system, the problem of larger errors easily produced by an electric energy meter calibration instrument in the prior art is solved, and further the effects of decreasing errors of the electric energy meter calibration instrument and improving field calibration accuracy are achieved.
Description
Technical field
The present invention relates to field of electrical equipment, in particular to a kind of calibration equipment and system of split core type current transformer.
Background technology
Electric energy meter on-site calibrator is for the metering outfit at the installing type such as transformer station, resident electric energy meter actual motion place on-the-spot test electric energy meter error.At the scene, electric energy meter is in energising operation conditions, and because the many factors such as client's needs, experimental safe are considered, often can not take to disconnect electric energy meter circuit, the mode then accessing electric energy meter on-site calibrator in the line carries out the error measure of electric energy meter.Now, the means taked use split core type current transformer (also claiming electric current split-core type meter) to carry out current sample, by current line being inserted in the jaw of electric current split-core type meter, utilizing electromagnetic induction principle to obtain the current value of current return, thus calculating electric energy error.
Owing to being subject to electric current split-core type meter jaw clean-up performance, the degree of wear, and the position of the current line extended there through and angle impact, often there is certain error in the current value that sampling obtains, the sampling error of electric current split-core type meter is one of the important sources and factor that form field-checking electric energy meter error.Thus, when the electric energy meter on-site calibrator cycle verifies, laboratory needs the overall measuring error verifying electric energy meter on-site calibrator and electric current split-core type meter, to ensure that the fundamental error of electric energy meter on-site calibrator meets request for utilization.
At present, for the verification of split core type current transformer, take to be connected with low side current line the high-end of electric current of device for energy meter standard, then by split core type current transformer, the mode be clipped in current line carries out verification more.There are following several deficiencies in this kind of mode:
First, because current line mostly is flexible cord, and the jaw bore of wire diameter and electric current split-core type meter is scarcely same, therefore when electric current split-core type meter vises current line, cannot obtain fixing position and angle, affect by this, the stability of check results is very poor, be difficult to the good data of agreeing property when duplicate measurements, measurement result does not possess repdocutbility.
Secondly, during the very little access device for energy meter standard of the internal resistance due to current line, device is operate in light condition substantially, may impact thus to measurement result.In addition, connected mode like this, when the electric current passed through is larger, can produces strong space magnetic field, thus affect measurement result accuracy.
Moreover, because the specification of electric current split-core type meter is different, often need in test to change current line according to the specification of electric current split-core type meter, add the complicacy of operation, be also unfavorable for the maintenance of test environment.
Easily there is the problem compared with big error for powermeter verification instrumeter in correlation technique, not yet propose effective solution at present.
Summary of the invention
Fundamental purpose of the present invention is the calibration equipment and the system that provide a kind of split core type current transformer, easily occurs the problem compared with big error to solve powermeter verification instrumeter in prior art.
To achieve these goals, according to an aspect of the present invention, provide a kind of calibration equipment of split core type current transformer, comprise: hanger bracket, have cross bar, the first support member, the second support member and fixture, wherein, the first supports support is in the below of cross bar first end, second supports support is in the below of cross bar second end, and the first end of fixture is fixed on the below of hanger bracket; Electric energy meter standard component, for providing stable measuring current; Reference test bar, be located on the first support member, the second support member and fixture, and the two ends of reference test bar is all connected with electric energy meter standard component, forms the test loop being used for test transmission electric current; And powermeter verification instrumeter, be all connected with split core type current transformer with electric energy meter standard component, measure electric flux for the test current calculation detected according to split core type current transformer, and measurement electric flux is fed back to electric energy meter standard component.
Further, the first wire lays along the first support member, and wherein, the first wire is the wire of connecting test bar first end and electric energy meter standard component; And second wire lay along the second support member, cross bar and the first support member successively, wherein, the second wire is the wire of connecting test bar second end and electric energy meter standard component.
Further, reference test bar comprises: the first reference test bar; And second reference test bar, wherein, the cross-sectional area of the second reference test bar is less than the cross-sectional area of the first reference test bar.
Further, surface level residing for the first reference test bar is higher than surface level residing for the second reference test bar.
Further, the first reference test bar and the second reference test bar include: A phase reference test bar; B phase reference test bar; And C phase reference test bar, wherein, the A phase reference test bar, the B phase reference test bar that belong to the first reference test bar are identical with the cross-sectional area of C phase reference test bar, and the A phase reference test bar, the B phase reference test bar that belong to the second reference test bar are identical with the cross-sectional area of C phase reference test bar.
Further, surface level residing for A phase reference test bar is higher than surface level residing for B phase reference test bar, and surface level residing for B phase reference test bar is higher than surface level residing for C phase reference test bar.
Further, calibration equipment also comprises: A phase switch, is arranged on the test loop of A phase reference test bar; B phase switch, is arranged on the test loop of B phase reference test bar; And C phase switch, be arranged on the test loop of C phase reference test bar, electric energy meter standard component comprises: control panel, is all connected with C phase switch with A phase switch, B phase switch.
Further, the quantity of fixture is multiple, and the first end of each fixture is all fixed on the below of hanger bracket, and multiple mid point of fixture line and the center of hanger bracket are on same vertical curve.
To achieve these goals, according to a further aspect in the invention, provide a kind of check system of split core type current transformer, comprising: split core type current transformer; And calibration equipment, wherein, the calibration equipment of any one split core type current transformer that calibration equipment provides for foregoing of the present invention.
The present invention adopts the calibration equipment with the split core type current transformer of following structure: hanger bracket, there is cross bar, the first support member, the second support member and fixture, wherein, first supports support is in the below of cross bar first end, second supports support is in the below of cross bar second end, and the first end of fixture is fixed on the below of hanger bracket; Electric energy meter standard component, for providing stable measuring current; Reference test bar, be located on the first support member, the second support member and fixture, and the two ends of reference test bar is all connected with electric energy meter standard component, forms the test loop being used for test transmission electric current; And powermeter verification instrumeter, be all connected with split core type current transformer with electric energy meter standard component, measure electric flux for the test current calculation detected according to split core type current transformer, and measurement electric flux is fed back to electric energy meter standard component.By arranging the calibration equipment of the split core type current transformer of said structure, can split core type current transformer be hung on reference test bar, the measuring current by reference test bar is detected by electromagnetic induction, the verifying attachment of this kind of structure is by reference test bar test transmission electric current, fixing position and angle can be obtained when split core type current transformer hangs on reference test bar, ensure that the stability of check results, and then accurately can verify the sampling error of split core type current transformer, avoid follow-up to powermeter verification instrumeter formation site error, solve powermeter verification instrumeter in prior art and easily occur the problem compared with big error, and then reach reduction powermeter verification instrumeter error, improve the effect of field-checking accuracy.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the calibration equipment of split core type current transformer according to the embodiment of the present invention;
Fig. 2 is the enlarged drawing of 21 parts in Fig. 1;
Fig. 3 is the verification schematic diagram of the calibration equipment of split core type current transformer according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the calibration equipment of current transformer according to the preferred embodiment of the invention;
Fig. 5 is the schematic diagram that in the calibration equipment of the split core type current transformer of the embodiment of the present invention, control panel controls test loop; And
Fig. 6 and Fig. 7 is the schematic diagram of two pieces of control panels in the calibration equipment according to the split core type current transformer of the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Embodiments provide a kind of calibration equipment of split core type current transformer, below the calibration equipment of the split core type current transformer that the embodiment of the present invention provides be specifically introduced:
Fig. 1 is the structural drawing of the calibration equipment of split core type current transformer according to the embodiment of the present invention, Fig. 2 is the enlarged drawing at 21 places in Fig. 1, as depicted in figs. 1 and 2, this calibration equipment mainly comprises hanger bracket 10, electric energy meter standard component 20, reference test bar 30 and powermeter verification instrumeter (not shown), wherein:
Hanger bracket 10 has cross bar 11, first support member 12, second support member 13 and fixture 14, wherein, first support member 12 is supported on the below of cross bar 11 first end, second support member 13 is supported on the below of cross bar 11 second end, namely, first support member 12 and the second support member 13 are supported on the two ends of hanger bracket 10, and the first end of fixture 14 is fixed on the below of hanger bracket 10.
Electric energy meter standard component 20 is for providing stable measuring current.
Reference test bar 30 is located on the first support member 12, second support member 13 and fixture 14, and the two ends of reference test bar 30 are all connected with electric energy meter standard component 20, forms the test loop being used for test transmission electric current.
Powermeter verification instrumeter is all connected with split core type current transformer with electric energy meter standard component 20, measures electric flux, and measurement electric flux is fed back to electric energy meter standard component 20 for the test current calculation detected according to split core type current transformer.Particularly, powermeter verification instrumeter can adopt the method for any one computation and measurement electric flux in prior art to calculate measurement electric flux, mainly according to the measuring current that split core type current transformer detects, with the magnitude of voltage in test loop, calculate measurement electric flux, then measurement electric flux equal proportion is fed back to electric energy meter standard component 20 with electric pulse form.Electric energy meter standard component 20 can calculate the desired electrical energy self provided, and compared with the measurement electric flux this desired electrical energy and powermeter verification instrumeter measured, obtains measuring error, complete verification.
Fig. 3 is the verification schematic diagram of the calibration equipment according to the embodiment of the present invention, as shown in Figure 3, the verification principle of the calibration equipment of split core type current transformer is: electric energy meter standard component 20 is provided in the measuring current of transmission on reference test bar 30, split core type current transformer is suspended on reference test bar 30, measuring current can be detected, the test current calculation that powermeter verification instrumeter detects according to split core type current transformer measures electric flux, and measurement electric flux is fed back to electric energy meter standard component 20, compared with the measurement electric flux that the desired electrical energy that self provides by electric energy meter standard component 20 and powermeter verification instrumeter are measured, obtain measuring error, complete verification.
By the calibration equipment of the split core type current transformer of the embodiment of the present invention, split core type current transformer can be hung on reference test bar 30, the measuring current by reference test bar 30 is detected by electromagnetic induction, the verifying attachment of this kind of structure is by reference test bar 30 test transmission electric current, fixing position and angle can be obtained when split core type current transformer hangs on reference test bar 30, ensure that the stability of check results, and then accurately can verify the sampling error of split core type current transformer, avoid follow-up to powermeter verification instrumeter formation site error, solve powermeter verification instrumeter in prior art and easily occur the problem compared with big error, and then reach reduction powermeter verification instrumeter error, improve the effect of field-checking accuracy.
Preferably, the first wire lays along described first support member 12, and wherein, described first wire is the wire connecting described reference test bar 30 first end and described electric energy meter standard component 20.Second wire lays along described second support member 13, described cross bar 11 and described first support member 12 successively, and wherein, described second wire is the wire connecting described reference test bar 30 second end and described electric energy meter standard component 20.That is, current line enters hanger bracket 10 from the collateral support of hanger bracket 10 first, arrives the second collateral support of hanger bracket 10 through fixture 14, upwards gets back to the first collateral support of hanger bracket 10 through top cross bar 11, gets back to electric energy meter standard component 20 downwards from the first side support base.
Due to when passing into electric current, when electric current forms ring-type, stronger magnetic field can be produced at Ring current distribution, thus measurement is had a huge impact.Therefore take the mode that former road returns, reduce the size of electric current loop as far as possible, thus reduce space magnetic field, to reduce impact split core type current transformer being detected to measuring current, reach the effect ensureing verification accuracy.
Fig. 4 is the schematic diagram of the calibration equipment of split core type current transformer according to the preferred embodiment of the invention, as shown in Figure 4, in the preferred embodiment, reference test bar 30 quantity comprises the reference test bar of plurality of specifications, two kinds are diagrammatically illustrated in Fig. 4, wherein, first reference test bar 31 and the second reference test bar 32 are all located in the first support member 12, on second support member 13 and fixture 14, the specification of reference test bar can be embodied by the size of reference test bar xsect, the cross-sectional area diagrammatically illustrating the second reference test bar 32 in Fig. 4 is less than the cross-sectional area of the first reference test bar 31, in embodiments of the present invention, first reference test bar 31 can be set to cross-sectional area is 25mm
2reference test bar, it is 4mm that the second reference test bar 32 is set to cross-sectional area
2reference test bar.
By arranging the different reference test bar of specification on hanger bracket, achieving without the need to changing current line, can verify the split core type current transformer of different size, decreasing the complicacy of operation, and be conducive to the maintenance testing and verify environment.
Preferably, surface level residing for the first reference test bar 31 is higher than surface level residing for the second reference test bar 32, that is, the surface level residing for reference test bar that cross-sectional area is larger, higher than the surface level residing for the reference test bar that cross-sectional area is less.
The larger reference test bar of cross-sectional area is for transmitting larger measuring current, the less reference test bar of cross-sectional area is for transmitting less measuring current, and the larger magnetic field of electric current is stronger, by reference test bar larger for cross-sectional area being arranged on position by the top, more close to the return current line of top cross bar, reach the effect reducing space magnetic field further.
Preferably, first reference test bar 31 and the second reference test bar 32 include A phase reference test bar, B phase reference test bar and C phase reference test bar, wherein, the A phase reference test bar, the B phase reference test bar that belong to the first reference test bar 31 are identical with the cross-sectional area of C phase reference test bar, and the A phase reference test bar, the B phase reference test bar that belong to the second reference test bar 32 are identical with the cross-sectional area of C phase reference test bar.
By the first reference test bar 31 and the second reference test bar 32 are all set to three-phase reference test bar, achieve and directly can carry out three-phase verification.
Preferably, surface level residing for A phase reference test bar is higher than surface level residing for B phase reference test bar, and surface level residing for B phase reference test bar is higher than surface level residing for C phase reference test bar.
Due in reality verification, many to the single-phase verification of split core type current transformer, so, by A phase reference test bar being arranged on position by the top, more close to the return current line of top cross bar, reach the space magnetic field reduced in test checking procedure.
Further, the calibration equipment of the split core type current transformer of the embodiment of the present invention also comprises the switch controlling test loop and be turned on or off, and this switch can be relay switch.Particularly, the test loop of A phase reference test bar arranges A phase switch, the test loop of B phase reference test bar arranges B phase switch, the test loop of C phase reference test bar arranges C phase switch.20, electric energy meter standard component comprises control panel, this control panel is mainly used in controlling calibration equipment and provides measuring current on the reference test bar of which kind of specification, and provide measuring current for any the phase current line controlled to reference test bar, wherein, control panel is all connected with C phase switch with A phase switch, B phase switch, for by the closed of gauge tap or disconnection, control whether whether to provide measuring current to a certain phase current line.
Fig. 5 is the schematic diagram that control panel controls test loop, as shown in Figure 5, routine principle of specification is verified as: electric current is from AIH point (the A-A phase of three-phase current case to carry out A phase current, I-electric current, H-is high-end, input end) input to No. 1 point knob on electric energy meter standard component 20, connect through this No. 1 point knob and enter the built-in standard scale of electric energy meter standard component 20, standard scale is gone out from No. 2 point knobs, come on the A phase test loop of the first reference test bar 31, on the A phase test loop of the second reference test bar 32 and on the built-in A phase loop of electric energy meter standard component 20, these 3 test loops respectively there is a relay switch.When needing the A phase loop through the first reference test bar 31, the relay controlling No. 5 points is connected, and 3, No. 4 point relaies disconnect; When needing the A phase loop through the second reference test bar 32, the relay of No. 4 points is connected, and the relay of 3, No. 5 points disconnects; When needs are through electric energy meter standard component 20 built-in A phase current loop, the relay of No. 3 points is connected, and the relay of 4, No. 5 points disconnects, and realizes the current switching in three loops thus.After 3 or 4 or No. 5 points, electric current, through reference test bar or built-in current loop, returns three-phase current case from AIL point (A-A phase, I-electric current, L-low side, output terminal).
Namely, the calibration equipment of the split core type current transformer that the embodiment of the present invention provides, there is the two circuit current line of three-phase, there are two current returns, and electric energy meter standard component 20 itself has a current return, therefore, when installing split core type current transformer on reference test bar, device for energy meter standard needs to control three road current returns.This programme takes the mode installing relay in current return additional to control, and 9 Control current switchings are designed in three-phase three loop altogether, can take the mode of dual control board for this reason.Control command is write the soft and hardware control system of electric energy meter standard component 20, thus all achieve the control to three loop currents in the manual operation keyboard of electric energy meter standard component 20 and the verification software of computing machine installation.
Fig. 6 and Fig. 7 is the schematic diagram of two pieces of control panels in the calibration equipment according to the split core type current transformer of the embodiment of the present invention, as shown in Figure 6 and Figure 7, three relays in A phase loop are controlled by XSB7, XSB8, XSB5 of No. 2 control panels 42, three relays in B phase loop are controlled by XSB3, XSA3, XSA5 of No. 1 control panel 41, and three relays in C phase loop are controlled by XSB11, XSA8, XSA11 of No. 1 control panel 41.
Preferably, in embodiments of the present invention, the quantity of fixture 14 is multiple, and the first end of each fixture 14 is all fixed on the below of hanger bracket 10, and multiple mid point of fixture 14 line and the center of hanger bracket 10 are on same vertical curve.The calibration equipment diagrammatically illustrating split core type current transformer in Fig. 3 comprises two fixtures 14.
By being set to multiple by the quantity of fixture, further ensure the stability of reference test bar, and then fixing position and angle can be obtained when ensureing that split core type current transformer hangs on reference test bar further.
The embodiment of the present invention additionally provides a kind of check system of split core type current transformer, and this check system, except comprising split core type current transformer, also comprises the calibration equipment of any one split core type current transformer that embodiment of the present invention foregoing provides.
As can be seen from the above description, present invention achieves following technique effect:
By supporting the use with existing electric energy meter standard component 20, achieving and the standardization of split core type current transformer is verified, and then achieve the standardization of the electric energy meter on-site calibrator with split core type current transformer is verified.Because reference test bar 30 takes hard material, and be fixed on hanger bracket 10,4mm
2and 25mm
2the jaw size of the secondary current split-core type meter of corresponding current main-stream respectively, achieve through the current line position of electric current split-core type meter jaw and the fixing object of angle, avoid because orientation problem causes measuring error to change greatly, inaccurate technical matters, ensure that the consistance of measurement result, accuracy.Simultaneously because possessed two circuits simultaneously, also eliminate the work changing current line according to specification, simplify work flow.
Further, consider the needs of robotization verification simultaneously, all control to loop current is all selected by software, arrange, simple, intuitive, by arranging different schemes, can realize higher robotization level check, increasing work efficiency.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a calibration equipment for split core type current transformer, is characterized in that, comprising:
Hanger bracket (10), there is cross bar (11), the first support member (12), the second support member (13) and fixture (14), wherein, described first support member (12) is supported on the below of described cross bar (11) first end, described second support member (13) is supported on the below of described cross bar (11) second end, and the first end of described fixture (14) is fixed on the below of described hanger bracket (10);
Electric energy meter standard component (20), for providing stable measuring current;
Reference test bar (30), be located on described first support member (12), described second support member (13) and described fixture (14), and the two ends of described reference test bar (30) are all connected with described electric energy meter standard component (20), form the test loop for transmitting described measuring current; And
Powermeter verification instrumeter, all be connected with split core type current transformer with described electric energy meter standard component (20), described test current calculation for detecting according to described split core type current transformer measures electric flux, and described measurement electric flux is fed back to described electric energy meter standard component (20).
2. calibration equipment according to claim 1, is characterized in that:
First wire lays along described first support member (12), and wherein, described first wire is the wire connecting described reference test bar (30) first end and described electric energy meter standard component (20); And
Second wire lays along described second support member (13), described cross bar (11) and described first support member (12) successively, and wherein, described second wire is the wire connecting described reference test bar (30) second end and described electric energy meter standard component (20).
3. calibration equipment according to claim 1, is characterized in that, described reference test bar (30) comprising:
First reference test bar (31); And
Second reference test bar (32), wherein, the cross-sectional area of described second reference test bar (32) is less than the cross-sectional area of described first reference test bar (31).
4. calibration equipment according to claim 3, is characterized in that, the residing surface level of described first reference test bar (31) is higher than the residing surface level of described second reference test bar (32).
5. calibration equipment according to claim 3, is characterized in that, described first reference test bar (31) and described second reference test bar (32) include:
A phase reference test bar;
B phase reference test bar; And
C phase reference test bar, wherein, the described A phase reference test bar, the described B phase reference test bar that belong to described first reference test bar (31) are identical with the cross-sectional area of described C phase reference test bar, and the described A phase reference test bar, the described B phase reference test bar that belong to described second reference test bar (32) are identical with the cross-sectional area of described C phase reference test bar.
6. calibration equipment according to claim 5, is characterized in that, surface level residing for described A phase reference test bar is higher than surface level residing for described B phase reference test bar, and surface level residing for described B phase reference test bar is higher than surface level residing for described C phase reference test bar.
7. calibration equipment according to claim 5, is characterized in that:
Described calibration equipment also comprises:
A phase switch, is arranged on the test loop of described A phase reference test bar;
B phase switch, is arranged on the test loop of described B phase reference test bar; And
C phase switch, is arranged on the test loop of described C phase reference test bar,
Described electric energy meter standard component (20) comprising:
Control panel, is all connected with described C phase switch with described A phase switch, described B phase switch.
8. calibration equipment according to claim 1, it is characterized in that, the quantity of described fixture (14) is multiple, the first end of each described fixture (14) is all fixed on the below of described hanger bracket (10), and multiple mid point of described fixture (14) line and the center of described hanger bracket (10) are on same vertical curve.
9. a check system for split core type current transformer, is characterized in that, comprising:
Split core type current transformer; And
Calibration equipment, wherein, the calibration equipment of the split core type current transformer of described calibration equipment according to any one of claim 1 to 8.
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| CN104730480B (en) | 2017-10-27 |
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