CN202142406U - Integrated network distribution transformer having error compensation mutual inductor - Google Patents
Integrated network distribution transformer having error compensation mutual inductor Download PDFInfo
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- CN202142406U CN202142406U CN201120177430U CN201120177430U CN202142406U CN 202142406 U CN202142406 U CN 202142406U CN 201120177430 U CN201120177430 U CN 201120177430U CN 201120177430 U CN201120177430 U CN 201120177430U CN 202142406 U CN202142406 U CN 202142406U
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- transformer
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- compensation
- winding
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Abstract
The utility model relates to an integrated network distribution transformer having error compensation mutual inductor, which is the integrated transformer having built-in current and voltage mutual inductor; the iron core, high-voltage and low-voltage main winding are same as those of the common transformer; in the box body of the transformer, the low-voltage side is parallelly connected with a low-voltage miniature transformer of a double-secondary winding and a no-load error compensation output unit composed of a capacitive impedance; a load error compensation output unit composed of a load compensation current mutual inductor and a secondary load is serially connected; and a load measuring current mutual inductor is further serially connected.
Description
Technical field
The utility model relates to a kind of integrated distribution transformer with the error compensation instrument transformer, is specially a kind of integrated distribution transformer that disposes zero load and load error characteristic compensation instrument transformer, belongs to power industry electric energy measurement and field of measuring techniques.
Background technology
The power distribution network transformer; Be the node that the user is faced in electric power system, integrated (miniaturization, integrated, the multifunction) of primary equipment is the development trend of Electric Power Network Planning, construction; High-tension apparatuses such as integrated transformer and instrument transformer; Help the safe and reliable of electrical network, help reducing overall cost, help monitoring the stealing electricity phenomenon of distribution.
Integrated distribution transformer with instrument transformer function; Can insert the micro electric table at box house; Record electric energy consumption truly through the transformer transmission, the continuous or timed sending continuous data through wireless mode, the power consumption that is used for being measured with high pressure winding electric power meter, low-pressure side kilowatt-hour meter compares in real time; Stealing electricity phenomenon is in time found in the safe operation of monitoring equipment; Simultaneously, cooperate integrated distribution transformer, can increase the pole type transformer function of use, make post attend the possibility that turns into of transformer station with instrument transformer function.
The existing integrated transformer of known band instrument transformer; Its current transformer is to measure two electric currents with the CT that band shape iron core is internal or external in the fuel tank; Voltage signal directly is taken from the secondary side outlet; China's utility model patent " metering power transformation transformer " (application number: the 200520057371.X applying date: 2005-04-16), " measuring integrated distribution transformer " (application number: 02276149.7 applying date: 2002-08-16) promptly be this structure that adopts, because the exciting current I of transformer
0With load current I
2It is also very little to compare proportion, and exciting current I
0Relatively stable, load current (also claiming transformer secondary survey electric current) I
2With primary side current I
1Relation be directly proportional, can obtain the higher primary side current scaled value of accuracy so penetrate current mutual inductor coil CT in secondary winding; But can find out, because load Z from transformer T-shape isoboles (accompanying drawing 1)
BThe load current I that produces
2With transformer magnetizing current I
0At primary impedance Z
1With the secondary winding impedance Z
2, cause secondary voltage U
2With primary voltage U
1Between there are differences, the secondary output voltage can not reflect primary voltage in proportion, for 35kV, 20kV and 10kV series distribution transformer; Difference according to capacity, structure; Deviation between secondary voltage and the primary voltage under zero load and fully loaded load condition can reach 5%～8%, and this measures primary side voltage to high accuracy and has produced difficulty; If can take simple, measure reliably; Export one group of deviation less than 0.2% primary side voltage measurement signal port and secondary side current signal port in the secondary terminals of transformer through the means of compensation, promptly constitute high accuracy simulation primary side voltage and secondary side current signal, monitoring transformer electric weight transmits situation; Realization has the integrated distribution transformer of the high accuracy function of built-in instrument transformer function, and can instruct more voltage levels transformer increase instrument transformer function.
Similarly built-in integrated high accuracy analogue measurement transformer primary side current voltage method and the device of pass through, monitoring transformer electric weight transmission situation is not shown in and has in the patent documentation.
Summary of the invention
The purpose of the utility model is the problem that proposes to background technology, and a kind of integrated distribution transformer with the error compensation instrument transformer is provided, and adopts the method for built-in zero load and load error characteristic compensation instrument transformer; Realize high accuracy analogue measurement transformer primary side current voltage; Record electric energy consumption truly through the transformer transmission, through wireless mode continuously or the timed sending continuous data, the real-time comparison of the power consumption that is used for being measured with high pressure winding electric power meter, low-pressure side kilowatt-hour meter; Be convenient in time find the generation of stealing electricity phenomenon; Adopt compensation ways such as voltage induced formula principle, phase shift technology, current transformer, adjustment voltage transformer error performance is through compensation; The accuracy that can guarantee instrument transformer is more than 0.2 grade; To satisfy electric energy metrical, voltage and current monitoring, relaying protection, harmonic measure needs, also can be combined into micro transformer station with miscellaneous equipment, and its accuracy space that has greatly improved.
The technical scheme of the utility model is: a kind of integrated distribution transformer with the error compensation instrument transformer; It is the built-in integrated transformer of electric current, voltage transformer; Its iron core, high pressure and low pressure main winding are identical with common transformer; It is characterized in that: in transformer-cabinet, low-pressure side is parallel with the low pressure miniature transformer of biquadratic winding and the no-load error compensation output unit of capacitive reactances formation; Be serially connected with the load error compensation output unit that load compensation current transformer and secondary load constitute; Also be serially connected with the load measurement current transformer.Its beneficial effect is: the biquadratic winding is used for the no-load error of compensated measurement primary voltage; The load compensation current transformer is used for the load error of compensated measurement primary voltage; The compensation output unit of no-load error is connected with the compensation output unit of load error; Constituted the composition error characteristic compensation that primary voltage is measured, the load measurement current transformer is used to measure distribution step down side electric current.
Aforesaid a kind of integrated distribution transformer with the error compensation instrument transformer is characterized in that: described no-load error compensation output unit is made up of the low pressure miniature transformer and the capacitive reactances of biquadratic winding; A winding of low pressure miniature transformer is attempted by distribution step down side output, and first secondary winding of low pressure miniature transformer is serially connected in compensation circuit, and second secondary winding of low pressure miniature transformer is parallel with capacitive reactances.Its effect is: first secondary winding is serially connected in compensation circuit, is used to compensate the amplitude of no-load error, and the capacitive reactances of parallel connection is used to compensate the phase place of no-load error.
Aforesaid a kind of integrated distribution transformer with the error compensation instrument transformer; It is characterized in that: load measurement current transformer and load compensation current transformer; All be to be through in the outlet of distribution transformer low voltage winding, be parallel with secondary load in the outlet of load compensation current transformer.Its effect is: the secondary load of load compensation current transformer and parallel connection is used for the load error compensation.
The operation principle of the utility model is: take no-load error ε
0Compensation and load error ε
LCompensation way, the transformer that solution has the instrument transformer function is in the secondary side voltage U
2With the primary side voltage U
1The proportionate relationship error problem, satisfy the relation of voltage transformer accuracy requirement, realize high accuracy analogue measurement transformer primary side current voltage purpose.
Description of drawings
Accompanying drawing 1 is traditional distribution transformer principle figure;
Accompanying drawing 2 is a voltage ratio error compensation schematic diagram;
Accompanying drawing 3 is the unloaded phase error compensation schematic diagram of voltage;
Accompanying drawing 4 is the no-load error compensation principle figure of band phase shift;
Accompanying drawing 5 is phase error compensation, the separate compensating circuit of ratio error compensation;
Accompanying drawing 6 is a load error compensation principle circuit;
Accompanying drawing 7 no-load errors and load error comprehensive compensation combined circuit;
The three-phase transformer overall structure circuit diagram of accompanying drawing 8 for having the instrument transformer function.
Embodiment
Mark in the accompanying drawing: in the accompanying drawing 1: Z
1---primary impedance Z
1(comprise winding resistance R one time
1With a winding leakage reactance X
1), Z
2---the secondary winding impedance Z
2(comprise winding resistance R one time
2With a winding leakage reactance X
2), Z
0---the excitation winding impedance Z
0(comprise the excitation winding resistance R
0With excitation winding induction reactance X
0), Z
B---secondary load, U
1---transformer primary side voltage, U
2---Circuit Fault on Secondary Transformer voltage, I
0---exciting current, I
2---load current;
In the accompanying drawing 2: A, N---high-pressure side winding terminal, a, n---low-pressure side winding terminal, a ', n '---voltage transformer function terminal,
---the no-load error compensating unit,
---load error compensating unit, U
2'---the voltage transformer output voltage;
In the accompanying drawing 3: T---the low pressure miniature transformer;
In the accompanying drawing 4: Z
b---low pressure miniature transformer secondary capacitive reactances;
In the accompanying drawing 5: T '---the low pressure miniature transformer of two secondary winding;
In the accompanying drawing 6: CT
B---compensation Current Transformer, Z
F---the secondary load of compensation Current Transformer;
In the accompanying drawing 7: CT---current transformer, K
1, K
2---CT secondary terminal;
In the accompanying drawing 8:
A, B, C---three-phase transformer high-pressure side winding terminal
A, b, c, n---three-phase transformer low-pressure side winding terminal
A ', b ', c '---three-phase transformer voltage transformer function terminal
CT
a, CT
b, CT
c---threephase current transformer
CT
Ba, CT
Bb, CT
Bc---three-phase compensation Current Transformer
T
a, T
b, T
c---the three-phase low pressure miniature transformer of two secondary winding
Z
Fa, Z
Fb, Z
Fb---the secondary load of three-phase compensation Current Transformer
Z
Ba, Z
Bb, Z
Bb---three-phase low pressure miniature transformer secondary impedance
K
A1, K
A2, K
B1, K
B2, K
C1, K
C2---threephase current transformer secondary terminal.
Below in conjunction with accompanying drawing inventive embodiments is described further:
With reference to accompanying drawing 1, shown in 2, causing the main cause of the proportionate relationship generation deviation (error) between conventional transformer secondary side voltage and the primary side voltage is exciting current I
0At primary impedance Z
1The error ε of last generation
0(be referred to as no-load error, ε
0=I
0Z
1), and the secondary load electric current I
2At primary impedance Z
1With the secondary winding impedance Z
2The load error ε of last generation
L, ε
L=I
2(Z
1+ Z
2), if take no-load error ε
0Compensation and load error ε
LCompensation way, as shown in Figure 2,
With
Be no-load error ε
0Compensation compensating unit and load error ε
LCompensating unit.The physical circuit kind of compensating unit is a lot, can improve the accurate level of the proportionate relationship between conventional transformer secondary side voltage and the primary side voltage.Among the utility model embodiment: the A-N terminal, represent transformer first side winding terminal, and the relation of the voltage ratio between the secondary side terminal a-n (U
1/ U
2), there is no-load error ε
0With load ε
LThat is:
(U
2-U
1)/U
1＝1+ε
0+ε
L
Seal in " ε in secondary side voltage terminal high-pressure side
0" and " ε
L" compensating unit compensates, and can eliminate no-load error ε
0With load ε
LEffect, make that the voltage ratio between A-N terminal and a '-n ' terminal concerns that error is less, that is: (U
2'-U
1)/U
1≈ 1.
A '-n ' terminal is as the voltage transformer function terminal use of transformer.
1) the no-load error ε of voltage ratio relation
0Compensation
No-load error ε
0Show that by Fig. 3 method compensates, the low pressure miniature transformer T of parallel connection, the difference in magnitude when secondary output terminals is used to compensate zero load.
Except carrying out the compensation of no-load error, also has the voltage transformer error compensation way of a lot of other kinds with this mode of miniature transformer T.If no-load error ε
0Also there is phase difference, can be at the secondary side parallel impedance Z of low pressure miniature transformer T
b, carry out phase compensation, as shown in Figure 4.The secondary winding of the shared low pressure miniature transformer of difference in magnitude and phase difference T, and the number of turn of secondary winding can design according to compensation rate.Usually the power consumption of low pressure miniature transformer T is in the mW level, secondary side parallel connection capacitive reactances Z
b
No-load error ε
0Also can compensate by method shown in Figure 5, low pressure miniature transformer T has 2 secondary winding, increases an independently phase compensation terminal, like this than the be more convenient for impedance Z of selecting phase adjusted to use of Fig. 4
b, the capacitor that can need compensate by phase difference calculating earlier, ratio difference is regulated separately with another secondary winding.
2) load error ε
LCompensation
Fig. 6 is the load error compensation way.Series compensation Current Transformer CT before secondary voltage terminal a-n
BSecondary load Z
FBecause Z
FOn voltage be directly proportional with the secondary load electric current, can compensate because of secondary load and be increased in Z among Fig. 1
1+ Z
2On pressure drop.In the design, compensation Current Transformer CT
BThe design of secondary current should be far longer than the output current of terminal a-n, to guarantee that measurement mechanism, metering device insert the load shunting that produces and need; Z
FWith Z
1+ Z
2Be directly proportional, and Z
FWith compensation Current Transformer CT
BSecondary current long-pending, equal Z
1+ Z
2Long-pending with the transformer secondary load current; Compensation Current Transformer CT
BSecondary winding and a winding reversed polarity.
3) ERROR CONTROL of composition error characteristic compensation and compensating element,
With no-load error ε
0Compensation and load error ε
LCompensation combine, just constituted the composition error characteristic compensation, see accompanying drawing 7.
General general distribution transformer, at full capacity and under unloaded two kinds of situation, primary voltage and secondary voltage only than variable quantity about 5% to 8%, guarantee that voltage transformer lead-out terminal a '-n ' satisfies 0.2 grade of level requirement, no-load error ε
0Compensating element, T and load error ε
LCompensating element, CT
BERROR CONTROL get final product at 1 grade or 2 grades.For example, when transformer had 5% deviation, the error range of compensation rate was: 100%-5%+5% (1 ± 2%)=95%+5% ± 0.1%=100% ± 0.1%, satisfy 0.2% level requirement; For example, 8% deviation, the error of compensation rate are 100%-8%+8% (1 ± 2%)=92%+8% ± 0.16%=100% ± 0.16%,, also satisfy 0.2% level requirement.
4) has the single-phase transformer overall structure of instrument transformer function
Fig. 7 in fact also is the single-phase transformer overall structure circuit diagram with instrument transformer function, increases a current mutual inductor coil CT.Secondary terminal a '-n ' and k
1-k
2, constituted the secondary terminal of the instrument transformer function of transformer.CT can design by the conventional current mutual inductor coil, and increases number of ampere turns of CT also than being easier at low-voltage terminal, guarantees that CT satisfies accuracy requirement.When low-power consumption requires, CT and CT
BCan combine together.
5) three-phase transformer part
Fig. 8 is the three-phase transformer overall structure figure with instrument transformer function.Circuit Fault on Secondary Transformer neutral point and voltage transformer neutral point be " n " terminal altogether.Compensation way is a benchmark with the phase voltage still, and during use, a '-n terminal can be combined into corresponding and terminal: an a '-b ' A-B with b '-n terminal.Current Transformer Secondary terminal K
A1-K
A2, K
B1-K
B2, K
C1-K
C2Only corresponding to the electric current of transformer secondary output a, b, c.
Be example with a 10KV/50KVA single-phase transformer below: transformer voltage ratio is 10KV/380V, short-circuit impedance 6%, no-load loss 2%.According to above-mentioned parameter, the exciting current 100mA under the rated primary voltage, the rated primary voltage load current 5A under at full capacity, the load current about 132A of rated secondary voltage under at full capacity, the short-circuit impedance of converting secondary side is 0.173 Ω.When the actual product impedance is perception, can adopt capacitor, reach emotional resistance compensation purpose through secondary coil reverse (180 ° of phase shifts).
The no-load error compensation uses low pressure miniature transformer T to be annular core, and core section is long-pending can select 6cm
2, the close 0.8T of magnetic, adopting line directly is enamelled wire coiling 3210 circles of 0.18mm, and its secondary winding selection wire directly is the enamelled wire coiling of 0.56mm, and the coiling number of turn is confirmed according to the actual no-load error measured value of transformer.When no-load error+2%, when the secondary line number of turn was selected 3210 * 0.02=64 circle, the phase difference compensation winding can differentially-wound group parameter on year-on-year basis equally be selected, and condenser capacity is selected to confirm according to the phase difference degrees of offset.
Compensation Current Transformer CT
BPress the 300AT design, annular core, no-load voltage ratio is got 150A/1A and is considered that its secondary load resistance is by 0.173 * 150=26 Ω, and core section amasss 6cm
2, it directly is the enamelled wire coiling of 1mm that secondary winding adopts line, 0.5 grade.
Claims (3)
1. integrated distribution transformer with the error compensation instrument transformer; It is the built-in integrated transformer of electric current, voltage transformer; Its iron core, high pressure and low pressure main winding are identical with common transformer; It is characterized in that: in transformer-cabinet, low-pressure side is parallel with the low pressure miniature transformer of biquadratic winding and the no-load error compensation output unit of capacitive reactances formation; Be serially connected with the load error compensation output unit that load compensation current transformer and secondary load constitute; Also be serially connected with the load measurement current transformer.
2. a kind of integrated distribution transformer with the error compensation instrument transformer as claimed in claim 1 is characterized in that: described no-load error compensation output unit is made up of the low pressure miniature transformer and the capacitive reactances of biquadratic winding; A winding of low pressure miniature transformer is attempted by distribution step down side output, and first secondary winding of low pressure miniature transformer is serially connected in compensation circuit, and second secondary winding of low pressure miniature transformer is parallel with capacitive reactances.
3. a kind of integrated distribution transformer as claimed in claim 1 with the error compensation instrument transformer; It is characterized in that: load measurement current transformer and load compensation current transformer; All be to be through in the outlet of distribution transformer low voltage winding, be parallel with secondary load in the outlet of load compensation current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120177430U CN202142406U (en) | 2011-05-30 | 2011-05-30 | Integrated network distribution transformer having error compensation mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120177430U CN202142406U (en) | 2011-05-30 | 2011-05-30 | Integrated network distribution transformer having error compensation mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202142406U true CN202142406U (en) | 2012-02-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120177430U Expired - Fee Related CN202142406U (en) | 2011-05-30 | 2011-05-30 | Integrated network distribution transformer having error compensation mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202142406U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611983A (en) * | 2017-09-30 | 2018-01-19 | 中国电力科学研究院 | A kind of integration apparatus for realizing error compensation power supply |
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
-
2011
- 2011-05-30 CN CN201120177430U patent/CN202142406U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611983A (en) * | 2017-09-30 | 2018-01-19 | 中国电力科学研究院 | A kind of integration apparatus for realizing error compensation power supply |
| CN109212293A (en) * | 2018-10-18 | 2019-01-15 | 中国电力科学研究院有限公司 | A kind of power supply type voltage transformer and application method with voltage measurement function |
| CN109212293B (en) * | 2018-10-18 | 2021-04-02 | 中国电力科学研究院有限公司 | Power supply type voltage transformer with voltage metering function and use method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120208 Termination date: 20130530 |