CN109856586A - A kind of current lifting device and preparation method thereof and the method for inspection - Google Patents
A kind of current lifting device and preparation method thereof and the method for inspection Download PDFInfo
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Abstract
The invention discloses a kind of current lifting device and preparation method thereof and the method for inspection, the method for inspection the following steps are included: (2-1) will export winding N1, N2 ... Nn respectively with first winding L1, L2 of standard current transformer ... Ln is mutually shorted by shorting stub；(2-2) uses preset high current conducting wire, and current lifting device connecting terminal corresponding with standard current transformer is connected；(2-3) obtains electric current ratio by being detected the nameplate of current transformer, according to the electric current of tested current transformer ratio, standard current transformer chooses the first winding of same current ratio, and the standard current transformer first winding of selection and the access of corresponding current lifting device first winding are examined and determine circuit.The present invention will improve the calibrating efficiency of laboratory, reduce work mistake risk to simplify transformer error test wiring.
Description
Technical field
The present invention relates to a kind of current lifting devices, and in particular to a kind of current lifting device and preparation method thereof and the method for inspection.
Background technique
Verification of Measuring Current Transformer is important compulsory verification measurement instrument, need to be by Verification of Measuring Current Transformer vertification regulation
Carry out for the first time, periodic calibration work, need during error test using current lifting device output test electric current.It is marked used in test
Quasi- current transformer first winding production is tap form, and secondary winding is also tap mode；Current lifting device is also using tap
Manufacture.There are two types of design methods for general current lifting device, and one is free-standing current lifting device, another kind is the mark of included current lifting device
Quasi- current transformer.
(1) tap and standard that current lifting device is needed when current transformer error test freestanding current lifting device: are being done
The tap of mutual inductor is corresponding, the capacity and size of current of corresponding current lifting device.Otherwise it has and is likely to occur test current liter less than rule
The case where constant current.Citing explanation: the terminal of conventional current lifting device has 500A*10V, 100A*20V and 50A*40V, and normalized current
It is 800A, LL2 400A, LL3 200A, LL4 100A ... that mutual inductor, which has LL1,.Such case will lead to test unit and
Staff can not differentiate matching process, cause the puzzlement of technical aspect；And wiring process is more, and workload is relatively large.It is excellent
Point is: current lifting device capacity can arbitrarily manufacture and design, and using will not substantially move, weight weight, volume very much not influences for laboratory
Staff uses.As shown in Figure 1 and Figure 2, freestanding precision current transformer is small in size, light-weight, is easy to implement every two
The periodic calibration work in year.
(2) precision current transformer of current lifting device is carried: it is this in current lifting device manufacture such as following procedure referring to Fig. 3, first will
All secondary winding coilings on the iron core of standard current transformer finish；The input winding technique of current lifting device is finished；Up-flow
Device is consistent with the iron core outer diameter and inner diameter difference of standard current transformer coiling with internal diameter around the iron core outer diameter made；By two
A iron core is simultaneously close together while coiling primary current winding；Then the overall wire being linked together is packaged into casing.It is excellent
Point: due to first winding coiling simultaneously when use, certain coiling Primary Conductor material and a set of outer can be saved
Shell, overall cost are lower.Disadvantage: due to considering that precision current transformer regulation regulation is every two years required to the inspection of higher level's calibration authority
Determining qualification can use, so current lifting device and standard current transformer assembly are set one, separate unit carries the standard of current lifting device
Current transformer volume weight is larger, (such as the precision current transformer weight of 2000A is 30kg, and 2000A carries current lifting device
Precision current transformer weight be 120kg, volume increase it is minimum 5 times) be not easy to transport, so that the capacity of current lifting device is also limited
System.
Summary of the invention
In view of the deficienciess of the prior art, it is an object of the present invention to provide a kind of current lifting device and preparation method thereof and inspection parties
Method will improve the calibrating efficiency of laboratory, reduce work mistake risk to simplify transformer error test wiring.
To achieve the goals above, the present invention is to realize by the following technical solutions:
A kind of current lifting device of the invention, including iron core and the primary input winding Nin and the big electricity of low pressure that are wound on iron core
Stream output winding, the low-voltage, high-current output winding is multiple mutually isolated output winding N1, N2 ... Nn.
Above-mentioned primary input winding Nin and low-voltage, high-current output winding are flat around mode using multiply.
Set low-voltage, high-current output winding N1, N2 ... the number of turns of Nn gear, output current scope is in specified electricity
1%~120%, 150% or the 200% of stream；Flow up to rated current primary expansion electric current when current lifting device input voltage be
Nominal input voltage 20%~90%.
The preparation method of current lifting device of the invention, comprising the following steps:
(1-1) coiling on iron core once inputs winding Nin；
(1-2) the multiple low-voltage, high-currents being mutually isolated of coiling export winding N1, N2 ... Nn respectively on iron core.
The method of inspection of current lifting device of the invention, comprising the following steps:
(2-1) will export winding N1, N2 ... Nn respectively with first winding L1, L2 of standard current transformer CTo ...
Ln is mutually shorted by shorting stub；
(2-2) uses preset high current conducting wire, and current lifting device connecting terminal corresponding with standard current transformer CTo is connected
It connects；
(2-3) obtains electric current ratio by being detected the nameplate of Current Transmit x, according to the electricity of tested Current Transmit x
Ratio is flowed, standard current transformer CTo chooses the first winding of same current ratio, and by the standard current transformer CTo mono- of selection
Secondary winding and corresponding current lifting device first winding access calibrating circuit.
In step (2-1), the low-voltage, high-current winding N1, N2 ... the rated current and standard current transformer of Nn
First winding L1, L2 of CTo ... the rated current of Ln is corresponding.
In step (2-2), the diameter D of the center hole on the cabinet of the current lifting device, center hole center from the ground height H with
The diameter of center hole of standard current transformer CTo and height is all the same from the ground, and capacity is matched with size of current.
In step (2-3), the first winding polar end L of the standard current transformer CTo and tested Current Transmit x
First winding polar end P1 docking, the winding that the non-polar end P2 of tested Current Transmit x is selected with current lifting device docks.
The secondary winding polar end of above-mentioned standard Current Transmit o is docked with the polar end of tested Current Transmit x,
And access to the difference current circuit k of mutual-inductor tester HE；Choose one of them non-pole of the standard current transformer CTo
Property end as normalized current input mutual-inductor tester HE the end To, be detected Current Transmit x nonpolarity termination Burden box Z
It is followed by the end Tx of mutual-inductor tester HE.
Compared with the latest prior art, the benefit that technical solution provided by the invention has is as follows by the present invention:
(1) compared with conventional independent current lifting device, secondary output is independent winding, the normalized current with conventional standalone
Mutual inductor matches, its low-voltage, high-current winding is connected respectively with the secondary winding of standard current transformer, according to practical inspection
It needs to choose specific low-voltage, high-current winding calmly and forms verification circuit, Ke Yijian consistent with precision current transformer in structure
Change the complicated wiring issue of a big current loop in transducer check.
(2) compared with the precision current transformer of included current lifting device, capacity can be done larger, and there is no due to weight
The problem of weight, volume are not easy greatly periodic calibration.
(3) not only have the characteristics that the capacity of free-standing current lifting device is larger, so that independent precision current transformer is easy to send
Inspection, and have the characteristics that use easy-to-connect from up-flow precision current transformer.
Detailed description of the invention
Fig. 1 is conventional independent current lifting device panel layout figure；
Fig. 2 is conventional free-standing current lifting device operation schematic diagram；
Fig. 3 is included current lifting device precision current transformer schematic diagram；
Fig. 4 is current lifting device schematic diagram of the invention；
Fig. 5 is the current lifting device of the invention schematic diagram in transformer error test job principle；
Fig. 6 (a) is the structural schematic diagram of current lifting device and independent precision current transformer of the invention；
Fig. 6 (b) is the top view of Fig. 6 (a).
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
Specific embodiment, the present invention is further explained.
It is as described in Figure 4: the current lifting device line map with simplification error test function.Nin is once to input winding, N1, N2,
N3, N4~Nn are that the low-voltage, high-current of multiple mutually isolated windings respectively exports winding.
As shown in Figure 5: CTo is standard current transformer, and class of accuracy is more general than tested current transformer (CTx) two high
More than class of accuracy, for examining and determine the error of tested current transformer.Wherein first winding polar end is L, and secondary polarity end is k.
CTx is tested current transformer, and first winding polar end is P1, and secondary polarity end is S1.
CTo first winding polar end L is docked with the first winding polar end P1 of CTx.
CTo secondary winding polar end k accesses the end k of mutual-inductor tester simultaneously after docking with the secondary polarity end S1 of CTx
Son.
SL is current lifting device of the present invention, for offer test primary current in Fig. 5 calibrating route.
Z is current transformer load box, for simulating the load of tested secondary loop of mutual inductor band.
HE is mutual-inductor tester, for standard current transformer and tested current transformer to be compared the error in route
Electric current and normalized current measure, and final measurement obtains the ratio error and angular error of tested current transformer.Wherein k
Terminal measures difference current, To terminal measurement standard secondary current.
When test current pass through simultaneously standard current transformer CTo (with subject current transformer same current ratio) with
And when being tested the first winding of Current Transmit x, (specific choice is according to subject electricity by standard current transformer secondary winding kKn
The nameplate of the electric current ratio of current transformer and standard current transformer determines) it is with subject secondary winding in current transformer S1S2 equal
Secondary current can be exported, (subject electric current is mutual since two output electric current secondary currents pass through a node S1 according to Fig.5,
The secondary polarity end of sensor), according to Kirchhoff's current law (KCL), all entrance of this node and electric current of going out add up to zero, because
This this node will generate secondary by the secondary output electric current of standard current transformer (CTo) and tested current transformer (CTx)
The difference current after current subtraction is exported, this difference current is exactly the absolute error of tested current transformer, difference current
Into the k terminal of mutual-inductor tester.
KG is that the first winding of standard current transformer switches switch, can also be by manually carrying out operation switching.
Error measure route, when need current transformer error examine when, by N1, N2, N3, N4~Nn respectively at
L1, L2, L3, L4~Ln of external precision current transformer CTo is mutually shorted by shorting stub, current lifting device and precision current transformer
Center hole simultaneously punching test lead, according to one in transformation ratio selection punching the number of turns or N1, N2, N3, N4~Nn of test item
A winding participates in the error checking of current transformer.
The first winding polar end of precision current transformer CTo is docked with the polar end of tested Current Transmit x, CTx
The winding selected of non-polar end and current lifting device dock, complete the wiring of primary circuit；CTo secondary winding polar end and CTx's
Polar end docks and accesses to the difference current circuit k of HE mutual-inductor tester；Choose one of non-polar end conduct of CTo
Normalized current inputs the end To of HE, and the nonpolarity termination Burden box Z of tested Current Transmit x is followed by the end Tx of HE.HE is
Error of measurement formula mutual-inductor tester.
With conventional standalone current lifting device compared with precision current transformer error checking, since the output of current lifting device is electric greatly
It flows winding and precision current transformer first winding corresponds, and can disposably be connected by shorting stub, in use process
It is not removing, the wiring of the artificial matching current lifting device output and precision current transformer first winding that simplify, and due to capacity
Also it matches, it is direct so as to the output services electric current under more satisfied output voltage, such as power supply output 50V~200V
Rating test electric current can be reached.
Compared with the precision current transformer of conventional included current lifting device, free-standing current lifting device of the invention is from shape knot
Structure, output winding terminals arrangement, center hole height, aperture are consistent with precision current transformer, so that the two can be side by side
It places, it is compact structure and easy to use.
In Fig. 6 (a), the punching hole site of current lifting device, height H, aperture D and standard current transformer punching hole site,
Highly, aperture is all the same.In Fig. 6 (b), the first winding position of current lifting device, height, rated current and standard current transformer
First winding position, height, rated current are corresponding.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of current lifting device, which is characterized in that including iron core and the primary input winding Nin and the big electricity of low pressure that are wound on iron core
Stream output winding, the low-voltage, high-current output winding is multiple mutually isolated output winding N1, N2 ... Nn.
2. current lifting device according to claim 1, which is characterized in that the primary input winding Nin and low-voltage, high-current are defeated
Winding is flat around mode using multiply out.
3. current lifting device according to claim 1, which is characterized in that set low-voltage, high-current output winding N1,
N2 ... the number of turns of Nn gear, output current scope in rated current 1%~120%, 150% or 200%；It flows up to volume
The input voltage of current lifting device is nominal input voltage 20%~90% when the primary expansion electric current of constant current.
4. a kind of preparation method of current lifting device, which comprises the following steps:
(1-1) coiling on iron core once inputs winding Nin；
(1-2) the multiple low-voltage, high-currents being mutually isolated of coiling export winding N1, N2 ... Nn respectively on iron core.
5. a kind of method of inspection of current lifting device, which comprises the following steps:
(2-1) will export winding N1, N2 ... Nn respectively with first winding L1, L2 of standard current transformer CTo ... Ln is logical
Shorting stub is crossed mutually to be shorted；
(2-2) uses preset high current conducting wire, and current lifting device connecting terminal corresponding with standard current transformer CTo is connected；
(2-3) obtains electric current ratio by being detected the nameplate of Current Transmit x, according to the electric current ratio of tested Current Transmit x,
Standard current transformer CTo chooses the first winding of same current ratio, and by the standard current transformer CTo first winding of selection
And corresponding current lifting device first winding access calibrating circuit.
6. the method for inspection of current lifting device according to claim 5, which is characterized in that in step (2-1), the big electricity of low pressure
Flow winding N1, N2 ... first winding L1, L2 of the rated current of Nn and standard current transformer CTo ... the specified electricity of Ln
It flows corresponding.
7. the method for inspection of current lifting device according to claim 5, which is characterized in that in step (2-2), the current lifting device
The diameter D of center hole on cabinet, center hole center from the ground the diameter of center hole of height H and standard current transformer CTo and
Height is all the same from the ground, and capacity is matched with size of current.
8. the method for inspection of current lifting device according to claim 5, which is characterized in that in step (2-3), the normalized current
The first winding polar end L of mutual inductor CTo is docked with the first winding polar end P1 of tested Current Transmit x, is detected electric current
The non-polar end P2 of mutual inductor CTx is docked with the winding that current lifting device is selected.
9. the method for inspection of current lifting device according to claim 8, which is characterized in that the standard current transformer CTo's
Secondary winding polar end is docked with the polar end of tested Current Transmit x, and accesses to the difference electricity of mutual-inductor tester HE
Flow back to road k；The one of non-polar end for choosing the standard current transformer CTo inputs transducer check as normalized current
The nonpolarity termination Burden box Z at the end To of instrument HE, tested Current Transmit x is followed by the end Tx of mutual-inductor tester HE.
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| CN201910174821.XA CN109856586B (en) | 2019-03-08 | 2019-03-08 | Current rising device and preparation method and inspection method thereof |
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| CN201910174821.XA CN109856586B (en) | 2019-03-08 | 2019-03-08 | Current rising device and preparation method and inspection method thereof |
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| CN109856586B CN109856586B (en) | 2021-07-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111157941A (en) * | 2020-01-19 | 2020-05-15 | 广东电网有限责任公司计量中心 | Device and method for quickly switching and checking primary winding of power transformer |
| WO2021000670A1 (en) * | 2019-07-04 | 2021-01-07 | 南京丹迪克电力仪表有限公司 | Method for preparing two-stage standard current transformer capable of implementing any change |
| CN113823495A (en) * | 2021-11-23 | 2021-12-21 | 武汉磐电科技股份有限公司 | Bi-linear package subassembly and high-voltage self-boost standard current transformer |
| CN114823088A (en) * | 2022-06-23 | 2022-07-29 | 国网湖北省电力有限公司营销服务中心(计量中心) | Standard transformer and using method thereof |
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