CN2265583Y - Self-adaptation compensator for potential transformer secondary circuit potential drop - Google Patents
Self-adaptation compensator for potential transformer secondary circuit potential drop Download PDFInfo
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- CN2265583Y CN2265583Y CN 96233737 CN96233737U CN2265583Y CN 2265583 Y CN2265583 Y CN 2265583Y CN 96233737 CN96233737 CN 96233737 CN 96233737 U CN96233737 U CN 96233737U CN 2265583 Y CN2265583 Y CN 2265583Y
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Abstract
The utility model discloses a self adaptation compensator for potential transformer secondary loop potential drop. The voltage drop of a secondary loop resistance RZ of a voltage sensor is collected by the primary stage of a sampling transformer 1B of a voltage sampling circuit YSJ, is connected to the secondary stage of the sampling transformer 1B, and is transmitted into a negative feedback amplifier IC1; the feedback voltage signal of the secondary stage of a compensating transformer 3B is taken by the primary stage of a feedback transformer 2B of a feedback circuit FK, is connected to the secondary stage, and is transmitted into a negative feedback amplifier IC2. The secondary stage of a transformer 3B is connected between an end b and an end c in series. The output of the IC1 and IC2 are connected with the input of a differential operation amplifier IC3 of an operating amplifying circuit US. The output of the IC3 is connected with the input of a power amplifier IC4 of a power amplifying and output circuit GF, and the output of an IC4 is connected with the primary stage of the compensating transformer 3B. The size of the secondary output voltage delta V' of the 3B is the same with the size of the voltage drop of a secondary loop, the phases of the secondary output voltage delta V' and the voltage drop of the secondary loop are opposite, and the dynamic vector compensation of the voltage drop of the secondary loop is realized.
Description
The utility model is relevant with the electric energy metrical compensation arrangement.
Traditional electric energy metrical compensation arrangement can only bucking voltage instrument transformer secondary lead voltage drop, promptly press voltage transformer actual motion condition, measure the voltage drop of secondary lead, utilize compensator to be compensated again, the precision of metering system can partly be improved.This type of device is the fixed value compensation device, thinks that promptly secondary voltage drop is a definite value, utilizes compensator to make fixed value compensation.This understanding does not meet the actual conditions of PT secondary circuit voltage drop, and the secondary circuit voltage drop is not a definite value, but a dynamic variable, examination is trampled and is shown, and the PT secondary circuit also has contact resistance except that the secondary conductor resistance is arranged.Contact resistance is subjected to the disconnecting link (or quick air switch) of PT secondary circuit, and the combined floodgate situation of insurance and splicing ear compresses intensity, aging influence, so contact resistance is at random, can not prediction, sometimes the resistance than secondary lead itself is also big, even arrives several times greatly.Former PT secondary voltage drop value also is at random, and existing electric energy metrical compensation arrangement can't be realized compensation to the secondary voltage drop of change at random, can not recompense to whole voltage drops of PT secondary circuit, so losing of electric weight still is a large amount of.
The purpose of this utility model provides the voltage drop of a kind of energy real-time tracking mutual induction of voltage (PT) secondary circuit, and from the enterprising action attitude compensation of vector, precision height, long service life, secondary circuit voltage drop adaptive equalization device with low cost.
The utility model is achieved in that
The elementary secondary circuit voltage drop Δ that on the secondary circuit resistance R Z of voltage sensor PT, collects by the sampling transformer 1B of voltage sampling circuit YSJ, commissure is sent into negative feedback amplifier IC1 to 1B level, the elementary of the feedback transformer 2B of feedback circuit FK obtained secondary the send into negative feedback amplifier IC2 of feedback voltage signal Δ ' commissure to 2B from 3B level of compensator transformer, the inferior utmost point of transformer 3B is serially connected with between the input C end of the resistance R Z of PT secondary circuit and electric energy meter P, IC1, the output of IC2 connects the input of the differential operational amplifier IC3 of operational amplification circuit US, after parameter is set up, the output voltage of IC3
0' remaining at one fixedly on the difference with the input signal difference of its input 2,3 pin, the output of IC3 connects the input of the power amplifier IC4 of power amplifier and output loop GF, and the output of IC4 connects the elementary of compensator transformer 3B.
Negative feedback amplifier IC1 of the present utility model, IC2 are integrated circuit, and its 3 pin is done homophase input computing, and 2,6 pin connect, and 7 pin connect positive supply, and 4 pin connect negative supply, and said differential operational amplifier IC3 is an integrated circuit, 6 pin output signal voltage
0', 2,3 pin respectively with IC1, the output of IC2 connects, 4 pin connect negative supply, 7 pin connect positive supply, said power amplifier IC4 is an integrated circuit, from the 1 pin applied signal voltage of IC4
0', amplifying the back through electric current, to output to compensator transformer 3B by 4 pin elementary, and its 2 pin is an end of oppisite phase, the voltage signal that exports from 4 pin
0Deliver to 2 pin through negative feedback resistor R10.
IC1 of the present utility model, IC2, IC3 can be integrated circuit OP07 or MA741 or OPA604 or NE5534, and IC4 can be integrated circuit TDA2030/A or TDA2040/A or TDA2006 or LM1875.
The utility model as shown in the figure, is the outlet voltage of voltage sensor PT; 1 is an electric energy meter P terminal voltage; Δ ' is an output voltage of the present utility model; ZB is the adaptive equalization device; DK is a disconnecting link; RD is a fuse; R is a secondary line resistance.RZ is a disconnecting link, the resistance that fuse, secondary line produce and.The output winding of ZB is serially connected between the terminal C point of terminal b of PT secondary circuit and electric energy meter P.ZB gathers PT secondary winding terminal a point current potential and the terminal b point of PT secondary circuit current potential by holding wire, and 2 potential differences of a and b are Δ value, as the input variable of adaptive equalization device.Pass through operational amplification circuit US again, power amplification and output circuit GF, feedback circuit FK, the output variable that makes the adaptive equalization device is Δ '.The utility model can make output variable Δ ' and PT secondary circuit voltage drop Δ remain at one fixedly on the difference by adjusting circuit parameter.As Δ during at 0.14V-5V, the voltage composite value of Δ ' and Δ below 0.1443V, i.e. Δ ' ≈-Δ , then following formula is set up:
1＝-Δ+Δ′≈
Be the influence of basic neutralisation PT secondary circuit voltage drop Δ , the voltage that the electric energy meter P terminal C of place is ordered equals PT port of export a point voltage, just as making electric energy meter P directly receive PT port of export a point.The utility model compensation precision height has improved the electric energy metrical precision.The utility model is simple in structure, and is with low cost, easy to use, and any debugging is not done at the scene, can be widely used in quantity of electricity of electric system exchange point and supply terminals, realizes that the meter degree is accurate, and charge calculation is fair and reasonable, and network loss also can accurately be calculated.
Following is accompanying drawing of the present utility model:
Fig. 1 is a use connection diagram of the present utility model (single-phase).
Fig. 2 is a block diagram of the present utility model.
Fig. 3 is circuit theory diagrams of the present utility model (single-phase).
Following is embodiment of the present utility model:
As shown in Figure 3,1B is the sampling transformer, and 2B is a feedback transformer, and 3B is a compensator transformer.1B is elementary to collect secondary circuit voltage drop Δ from PT secondary circuit resistance R Z, and commissure is done the homophase computing to secondary 3 pin of sending into integrated circuit (IC) 1, and IC1 is connected into a typical desirable follower, and signal is delivered to 2 pin of integrated circuit (IC) 3 by the 6 pin output of IC1.4 pin of IC1 connect negative supply, and 7 pin connect positive supply.
Feedback transformer 2B is elementary to obtain feedback voltage signal Δ ' from 3B level of compensator transformer, and commissure is done inphase operation to secondary 3 pin of sending into integrated circuit (IC) 2, and IC2 also is connected into a typical desirable follower, and signal is delivered to 3 pin of IC3 by the 6 pin output of IC2.4 pin of IC2 connect negative supply, and 7 pin connect positive supply.
Integrated circuit (IC) 3 is connected into differential operational, sees qualitatively, once after determining, the size of its 6 pin output signal voltage is only relevant with input signal VI1 and the difference of the input signal VI2 on its 3 pin on its 2 pin when circuit parameter, when parameter obtains suitablely, can make
0' remain at one fixedly on the difference with Δ .4 pin of IC3 connect negative supply, and 7 pin connect positive supply.
Resistance R 1, R2, R3, R4, R6 play a part to be used for adjusting and are input to IC1, IC2, IC3 semaphore size.The amplifying signal of IC3 depends on the ratio of R5+W1 and R3, and ratio is big more, and amplifying signal is big more.
Integrated circuit (IC) 4 is power amplifier elements of circuit.The voltage signal that sends from 6 pin of IC3
0' 1 pin (in-phase end) that enters IC4 amplifies the back through electric current, and to output to compensator transformer 3B by 4 pin elementary, and its secondary access PT secondary circuit provides a compensating potential Δ ' with realization.2 pin of IC4 are end of oppisite phase, from the voltage signal of 4 pin output
0Deliver to 2 pin through negative feedback resistor R10, suppress drift.R9, C2 provide a path for AC signal; C1, C3 are that power supply moves back commissure electric capacity; D1, D2 make the usefulness of afterflow; R11, C4 are the usefulness that is used for absorbing instantaneous overvoltage; R7, R8 are used for adjusting the usefulness of the signal magnitude that is input to IC4.
From the foregoing circuit analysis as can be known, obtain rationally, adjust the output voltage Δ ' that can make the adaptive equalization device and PT secondary circuit voltage drop Δ slightly and remain at one fixedly on the difference when circuit parameter.The design requires Δ when 0.14～5V, and the voltage composite value of Δ and Δ ' is below 0.1443V.This circuit meets design requirement fully.
Claims (3)
1, voltage transformer secondary loop pressure drop adaptive equalization device, it is characterized in that collecting secondary circuit voltage drop Δ on the secondary circuit resistance R Z by the elementary voltage sensor PT in every phase of the sampling transformer lB of voltage sampling circuit YSJ, commissure is sent into negative feedback amplifier IC1 to 1B level, elementary 3B level of compensator transformer from every phase of the feedback transformer 2B of feedback circuit FK obtains feedback voltage signal Δ ', commissure is to the secondary negative feedback amplifier IC2 that sends into of 2B, the inferior utmost point of transformer 3B is serially connected with between the input C end of the resistance R Z of PT secondary circuit and electric energy meter P, IC1, the output of IC2 connects the input of the differential operational amplifier IC3 of operational amplification circuit US, after parameter is set up, the output voltage of IC3
0' remaining a fixing difference with the input signal difference of its input 2,3 pin, the output of IC3 connects the input of the power amplifier IC4 of power amplifier and output loop GF, and the output of IC4 connects the elementary of compensator transformer 3B.
2, voltage transformer secondary loop pressure drop adaptive equalization device according to claim 1, it is characterized in that said negative feedback amplifier IC1, IC2 is an integrated circuit, its 3 pin is done homophase input computing, and 2,6 pin connect, 7 pin connect positive supply, 4 pin connect negative supply, and said differential operational amplifier IC3 is an integrated circuit, 6 pin output signal voltage
0', 2,3 pin respectively with IC1, the output of IC2 connects, 4 pin connect negative supply, 7 pin connect positive supply, said power amplifier IC4 is an integrated circuit, from the 1 pin applied signal voltage of IC4
0', amplifying the back through electric current, to output to compensator transformer 3B by 4 pin elementary, and its 2 pin is an end of oppisite phase, the voltage signal that exports from 4 pin
0Deliver to 2 pin through negative feedback resistor R10.
3, voltage transformer secondary loop pressure drop adaptive equalization device according to claim 1 and 2, it is characterized in that IC1, IC2, IC3 can be integrated circuit 0P07 or MA741 or OPA604 or NE5534, and IC4 can be integrated circuit TDA2030/A or TDA2040/A or TDA2006 or LM1875.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233737 CN2265583Y (en) | 1996-09-13 | 1996-09-13 | Self-adaptation compensator for potential transformer secondary circuit potential drop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233737 CN2265583Y (en) | 1996-09-13 | 1996-09-13 | Self-adaptation compensator for potential transformer secondary circuit potential drop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2265583Y true CN2265583Y (en) | 1997-10-22 |
Family
ID=33910339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96233737 Expired - Fee Related CN2265583Y (en) | 1996-09-13 | 1996-09-13 | Self-adaptation compensator for potential transformer secondary circuit potential drop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2265583Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351634C (en) * | 2004-05-21 | 2007-11-28 | 郑州大学 | Compensation method for voltage transformer secondary circuit pressure drop and compensation arrangement |
| CN1582528B (en) * | 2001-09-04 | 2011-09-28 | 美国亚德诺半导体公司 | Ping-pong amplifier with auto-zeroing and chopping |
| CN104331115A (en) * | 2014-10-23 | 2015-02-04 | 钱坤 | Circuit and method for eliminating PT secondary circuit voltage drop |
| CN107017850A (en) * | 2016-01-28 | 2017-08-04 | 江苏省电力公司南京供电公司 | A kind of voltage power amplifying circuit |
-
1996
- 1996-09-13 CN CN 96233737 patent/CN2265583Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1582528B (en) * | 2001-09-04 | 2011-09-28 | 美国亚德诺半导体公司 | Ping-pong amplifier with auto-zeroing and chopping |
| CN100351634C (en) * | 2004-05-21 | 2007-11-28 | 郑州大学 | Compensation method for voltage transformer secondary circuit pressure drop and compensation arrangement |
| CN104331115A (en) * | 2014-10-23 | 2015-02-04 | 钱坤 | Circuit and method for eliminating PT secondary circuit voltage drop |
| CN107017850A (en) * | 2016-01-28 | 2017-08-04 | 江苏省电力公司南京供电公司 | A kind of voltage power amplifying circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |