CN2720451Y - Digital PT secondary voltage-drop automatic metering compensator - Google Patents
Digital PT secondary voltage-drop automatic metering compensator Download PDFInfo
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- CN2720451Y CN2720451Y CN 03250175 CN03250175U CN2720451Y CN 2720451 Y CN2720451 Y CN 2720451Y CN 03250175 CN03250175 CN 03250175 CN 03250175 U CN03250175 U CN 03250175U CN 2720451 Y CN2720451 Y CN 2720451Y
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Abstract
The utility model discloses a high-precision digital PT secondary voltage-drop automatic metering compensator; the detection circuit and the display circuit adopt digital circuits at first in the same industry at home; the utility model is matched with software to intelligently, flexibly and effectively control a whole system. A compensating circuit which is on the basis on an adaptive principle utilizes a depth negative feedback closed loop structure to realize the automatic tracking and the vector compensation of high-precision and big-power state ranges for PT secondary circuit pressure-drop; the technical indexes of compensation accuracy, compensation ranges, load current, interference immunity, security, etc. and the combination property of the whole machine all reach domestic leading level. The utility model completely satisfies the requirements that the current power measurement system reduces errors and enhances accuracy.
Description
Technical field
The utility model relates to a kind of electric energy metrical compensation system; Relate to more specifically and have the automatic gauge compensation system that digital control automatic compensation function PT secondary voltage falls.
Technical background
Electric energy metrical is the important step of electrical production, and it is directly connected to the benefit and the development of electric system.Electric energy metered system generally is made up of mutual inductor (PT, CT), transmission line, electric energy meter meter three parts of scene installing.In generating plant and transformer station, the transmission line that connects the electric energy meter meter in from the voltage transformer (VT) (PT) of scene installing to the pulpit is often grown (what have reaches more than 500 meters), and often there are various switches, fuse, relay contact, terminal row etc. in the centre, exists various contact resistances and material resistance.Along with the increase of working time, owing to reasons such as aging, corrosions, resistance also can continue to increase.If secondary connects table meter, relay equipment and other load is heavier, load current is also bigger, and the power-factor of load, the mode of connection, the external magnetic field electromotive force of inducting in secondary circuit etc. all can produce the voltage drop of PT secondary circuit in addition simultaneously.In the actual motion, this part error is often than big many of the error of electric energy meter meter and voltage transformer (VT) itself, so that have a strong impact on the correctness and the fairness of electric energy metered system.Cause thus and send out the delivery imbalance, make power department count generated energy, delivery or electricity sales amount less, direct economic loss is very considerable.Electric power moves towards as commodity after the market, all wishes to improve as far as possible the electric energy metrical accuracy for the electricity consumption both sides, and this is directly connected to for the economic interests with both sides, and is especially true to large power consumer.
In order to reduce the electric energy metered system error, doing a large amount of work aspect the accuracy that improves electric energy meter meter and PT, CT in recent years, its technical merit also improves day by day, and relative national standards and regulation are also more and more stricter.But what variation the transmission link as one of chief component of whole electric energy metered system does not then have for many years substantially: the pressure drop that forms from PT to the transmission line of electricity the electric energy meter meter remains the key factor of electric energy metered system error.Reduce this fractional error if do not take measures, the accuracy of electric energy meter meter and mutual inductor is high again can not to make the accuracy of electric energy metered system meet the requirements of accuracy: engineering technical personnel have done a large amount of investigations to the electric energy metered system error and have analyzed the various methods that reduce error have been done contrast and research, think under present condition, in the PT secondary circuit, install and use the secondary circuit voltage drop automatic compensator.It is not only effective but also economic, not only safe but also easy, the not only high but also very ripe method of cost performance; Common simulation or problem such as PT secondary voltage drop compensator volume is big, power consumption is big, compensation precision is unstable, and the machine temperature is higher.Have only and develop that volume is little, in light weight, power consumption is little, has big dynamic compensation scope, High Precision Automatic tracking compensates the digital P T secondary voltage drop compensator with strong load performance, could satisfy generating plant, transformer station, accurate, the stable demand that compensates of PT secondary circuit voltage drop to greatest extent.
Summary of the invention
The purpose of this utility model is: easy and simple to handle, safe and reliable for the electric energy metrical of departments such as China generating plant, transformer station provides a kind of accuracy of measurement height, and adaptable digital P T secondary voltage drop automatic gauge compensator.
The purpose of this utility model is achieved by the following technical solution:
The problem that the inventor exists at prior art products, design philosophy with the advanced person with intelligent characteristic, with digitized circuit design, with the high-performance of product is target, demonstrate fully the advance and the feasibility of novel compensator technology, make the overall performance of this compensator system reach leading domestic level.
' digital P T secondary voltage drop automatic gauge compensator ' constitutes (referring to Fig. 1) by power module, compensating module, detection module, digital control module and display module five parts.Compensating module be one based on having of adaptive principle of degenerative closed loop configuration.It is the core of compensator; Detection module will be monitored in real time to the duty of power supply status, bus state and compensating module, and produces corresponding alerting signal and the moving handoff request of bus speech according to actual conditions, gives control module and handles; Digital control module provides the control function to total system, comprises the external control request that responds the user, handles the request etc. of automaticallying switch of warning message that inner detection module sends here and bus; The duty that display module can show before the not isopen compensation and the secondary circuit voltage drop magnitude of voltage after the compensation, current bus position, power supply are indicated, reported to the police indication and indicate current system; Power module provides reliable working power for total system.
The compensator primary power is made up of four switch power modules.Power control relay is connected after system powers on, and disconnects when system detects secondary circuit failure, cuts off the power supply of equalizing network, and protection compensates electrical equipment and to power supply enforcement intelligent management, is the distinguishing feature that this compensator is different from other compensator.
Compensating module constitutes a degenerative closed loop configuration by sample circuit, error arithmetic processing circuit, power amplification circuit according to adaptive principle.Be a varitrol, this system possesses adaptive characteristic, is vector compensation system truly.
Detection module is overflowed circuit such as detection to be made up of power state detection, bus state-detection, the phase failure and secondary voltage drop.All testing circuits all adopt photoelectricity to be coupled and realize electrical isolation.
After dividing potential drop, rectifying and wave-filtering is sent into photoelectric coupled circuit to power sense circuit with system power supply AC 220V, is digital level through the modulus level shifting circuit with power state transition, gives control circuit:
Digital control module utilization software is implemented control to the operation of compensator, makes the control technology of compensator reach the new height of Based Intelligent Control.Single-chip microcomputer is the core of control circuit, realizes various control function flexibly by software arrangements.Software control is the digital circuit of core owing to having adopted with the single-chip microcomputer.Make that control module can be by software arrangements very flexibly, control system effectively.Strengthened the operability of instrument.Improved intelligent processing capacity, made machine performance that new breakthrough arranged: simultaneously,, helped raising the efficiency, increase the service life because single-chip microcomputer works under the interrupt mode to fault.
Select circuit to form by code translator, relay, the choosing of sending here by control module mutually and compensate front/rear selection signal through decoding scheme decoding, the driving relay is selected the voltage content that will show, delivers to the voltage measurement circuit.Simultaneously, the signal after the part decoding is lighted light emitting diode, indicates current selection mode.
The characteristics of novel compensator collection digital circuit and mimic channel, with its type little (260 * 180 * 95), the precision height (width of cloth is poor≤and ± 0.04%, angular difference≤± 1 minute, the distinguishing feature of load capacity strong (load current 800mA, the limit can reach 1000mA) is passed through the calibrating high point of State Bureau of Technical Supervision smoothly.Stable and reliable operation on transformer station's electrical network, antijamming capability is strong, can adapt to on-the-spot running environment, and compensation effect is remarkable.
In sum, this compensator is a kind of high-precision digital voltage transformer (VT) (being called for short PT) secondary circuit voltage drop automatic gauge compensator.Its detection, control and display circuit take the lead in adopting in the same industry at home digital circuit, by software arrangements realize to total system carry out intelligence, flexibly, control effectively, make the compensator system structure that new breakthrough arranged technically.Compensating circuit is based on adaptive principle, utilize degree of depth negative feedback closed loop structure to realize the PT secondary circuit voltage drop is carried out the automatic tracking vector compensation of high precision, great dynamic range, the machine performance technical indicator is identified through Sichuan Province and State Power Corporation's scientific and technological achievement, has been reached leading domestic level.
Description of drawings
Fig. 1 system architecture diagram
Fig. 2 power module structured flowchart
Fig. 3 back-up source structured flowchart
Fig. 4 compensating module structured flowchart
Fig. 5 detection module structured flowchart
Fig. 6 numerical control modular structure block diagram
Fig. 7 display module structured flowchart
Fig. 8 power panel electrical schematic diagram
Fig. 9 compensating plate electrical schematic diagram
Figure 10 display board electrical schematic diagram
Embodiment
The preparation of embodiment digital P T secondary voltage drop automatic gauge compensator
The power module part
Referring to Fig. 2, Fig. 3 and shown in Figure 8, be electrical isolation completely between the equalizing network of realizing three-phase, primary power is made up of four switch power modules.
Power control relay is connected after system powers on, and disconnects when system detects secondary circuit failure, cuts off the power supply of equalizing network, protection compensation electrical equipment; Adopting power module to form the primary power of compensator, required each power supply of isolating mutually of system is provided and power supply is implemented intelligent management, is that this compensator is different from one of distinguishing feature of other compensator.Back-up source is made up of 9V maintenance-free battery and aptitude chargeable circuit.Aptitude chargeable circuit can automatically charge the battery according to the state of battery, and can be full of the back automatic cutout; Concrete scheme is seen Fig. 3.
The compensating module part
Referring to Fig. 4, Fig. 5 and Fig. 9, compensating module constitutes a degenerative closed loop configuration by sample circuit, error arithmetic processing circuit, power amplification circuit according to adaptive principle.
Sample circuit is sampled to the PT outlet current potential U of work at present bus and input current potential (being the output potential of the compensator) U3 of electric energy meter; In order to realize the electrical isolation of compensator and secondary circuit.The voltage signal that has used voltage transformer (VT) transmission to be sampled in the sample circuit;
The error arithmetic processing circuit is made of low-voltage biasing amplifier.The voltage signal that sample circuit is brought is asked difference and done suitable processing: the error signal after the processing is delivered to and is carried out power amplification in the power amplifier.Become the jadeware coupling by output then, bucking voltage is sealed in secondary circuit;
Power amplification adopts accurate Class B to the pipe power amplifier, and constitute the degree of depth negative-feedback circuit of strong driving force: power amplifier is operated in accurate Class B state, efficient height (65%).Circuit output impedance low (＜1 Ω) is used in the negative feedback design, and carrying load ability is strong.Output transformer is selected suitable variation, takes into account power utilization rate and impedance conversion.Compensation on output transformer is elementary will be delivered to detection module and carry out voltage monitoring, to carry out fault judgement.
Because error signal is the equivalent secondary voltage drop (the vector voltage ten compensation vector voltages on the secondary circuit equivalent resistance) after compensating, so circuit working is at loop circuit state, if the vector voltage on the secondary circuit equivalent resistance changes, this variation is embodied on the error signal vector voltage immediately, at this moment loop can be adjusted compensation vector voltage automatically, very fast meeting autostable is on new working point, and the maintenance error signal is in specialized range.
Because this compensating module is a negative feedback closed loop structure based on adaptive principle, so be a varitrol, this system possesses adaptive characteristic, is vector compensation system truly.When system balancing the phasor difference of U1 and U3 will be one indivisible.From compensation principle, as long as there is phasor difference U1-U3 to exist in the dynamic range of equalizing network, system always makes it level off to zero, that is to say the amplitude of output potential U3 of compensator and the phase place outlet current potential U1 with minimum error convergence PT.But with the amplitude of output voltage phase-independent of PT, irrelevant with the size of secondary voltage drop Δ U and phase angle, with compensator with the size and the character of secondary load irrelevant.
The working power input end is through the protecting against shock design; Circuit voltage all adopts the Switching Power Supply conversion and gets, and can guarantee that operate as normal under the condition of large deviation appears very much in compensator at civil power.The whole high resistant inputs of sampling input, and serial connection resettable fuse, compensator can not bring hidden danger to PT: simultaneously.Because the controlled design of key point voltage, compensator can in time be sent out the internal abnormality situation of seeing, automatically deactivate when going out to see when unusual compensator, compensator internal abnormality situation and PT secondary circuit failure can the allowance for damage devices, compensator after the release work, can not influence PT secondary circuit operation conditions automatically.
The detection module part
Referring to Fig. 5 and Fig. 9, detection module is overflowed circuit such as detection to be made up of power state detection, bus state-detection, the phase failure and secondary voltage drop.All testing circuits all adopt photoelectricity to be coupled and realize electrical isolation.
After dividing potential drop, rectifying and wave-filtering is sent into photoelectric coupled circuit to power sense circuit with system power supply AC 220V, is digital level through the modulus level shifting circuit with power state transition, gives control circuit.
The bus status detection is that a certain phase voltage of II section bus is sampled and sent into photoelectric coupled circuit: the default bus position of system is the I section, when II section bus has electricity, can encourage photoelectric coupled circuit, and the level state of its output is changed; After the outage of II section bus, optocoupler loses excitation, will change the state of output equally.After the modulus level conversion is carried out in the output of optocoupler, just can form bus automatic switchover request signal, deliver to control module and handle.
Do phase failure detection and secondary voltage drop overflow detection and detect in fact by the bucking voltage to the output transformer primary coil of compensating module and see: when bus goes out to see the phase failure or secondary voltage drop and overflows? the capital makes the output transformer primary coil bucking voltage of compensating module excessive, takes place by the fault that relatively judged whether to this voltage and thresholding; Produce corresponding fault-signal and give control module and handle, simultaneously failure message is delivered to display module, carry out indicating fault.
The detection of power supply status has realized the dead electricity warning function of system; The bus status detection can produce corresponding request signal, can realize the automatic switchover of bus by the software design of control module; Photoelectric coupled circuit has highly sensitive characteristics, can realize electrical isolation again simultaneously; Failure detector circuit can detect the situation that the bus phase failure and secondary voltage drop overflow.The protection bucking-out system can not cause damaging because of unloaded or overload; After fault was got rid of, the state of fault-signal can change; By software design, can see the automatic recovery of working state of system in fact, really accomplish unmanned; The distinguishing feature of this compensator measuring ability is that other compensator does not have.
Digital control part
Referring to Fig. 6 and Figure 10, single-chip microcomputer is the core of control circuit, realizes various control function flexibly by software arrangements.In order to make control and fault handling more reliable, effective, interrupt mode is all adopted in all inputs of single-chip microcomputer.
The setting of keyboard is: ' bus is selected the automatic/hand mode switch ', ' bus selects the I/II section to switch ', ' phase place shows switching ', ' compensating front/rear demonstration switches ', ' noise reduction ' and ' resetting '.
' bus is selected the automatic/hand mode switch ' and ' bus selects the I/II section to switch ' is used for bus is selected; When the selection pattern was ' automatically ', bus was selected drive signal ' state of response ' bus is selected request automatically ' signal, ' switching of I/II section ' key is invalid at this moment: when the selection pattern is ' manually '.Bus is selected drive signal response ' switching of I/II section ' key.All with the position of the current bus of coup, this moment, bus selected to ask conductively-closed to button operation automatically each time.Indication of bus preference pattern and bus are selected to drive, and signal is delivered to display mode.Mode of operation and the bright corresponding light emitting diode of location point according to current bus is selected are presented on the panel.
' phase place show switch ' and ' compensating front/rear demonstration switching ' is used to the content of selecting display module shown.Corresponding output signal ' is selected address signal ' mutually and ' selecting signal before and after the compensation ' delivers to display circuit, selects corresponding information of voltage to show after deciphering, and lights the current state of corresponding light emitting diode indication simultaneously.
' noise reduction ' key is used to sound all clear; When the fault-signal indication PT secondary circuit of sending here when detection module breaks down.Control circuit drives relay by ' control of equalizing network power supply ' and ' withdrawing from the compensation drive signal ' and disconnects the power supply of equalizing network and make instrument withdraw from compensating coefficient, ' alerting signal output ' driving sound and light alarm can be sounded all clear by ' noise reduction ' key at this moment simultaneously.
When ' fault-signal ' recovers normal condition, illustrate that fault gets rid of, this moment control system by software control, can stop warning voluntarily, and make total system reenter compensating coefficient: ' resetting ' key carries out hand-reset when being used for breaking down in system.
Software control is the digital circuit of core owing to having adopted with the single-chip microcomputer.Make that control module can be by software arrangements very flexibly, control system effectively.Strengthened the operability of instrument.Improved intelligent processing capacity, made machine performance that new breakthrough arranged fault; Simultaneously,, help raising the efficiency, increase the service life because single-chip microcomputer works under the interrupt mode.
The design of digital control module and utilization are implemented control with software to the operation of compensator, make the control technology of compensator reach the new height of Based Intelligent Control.This technology is the innovation part that this benefit is tasted the device technology, also is the remarkable difference with other compensator.
The display module part
Referring to Fig. 7 and Figure 10, select circuit to form by code translator, relay, the choosing of sending here by control module mutually and compensate front/rear selection signal through decoding scheme decoding, the driving relay is selected the voltage content that will show, delivers to the voltage measurement circuit.Simultaneously, the signal after the part decoding is lighted light emitting diode, indicates current selection mode.
Voltage conversion circuit comprises the conversion to DC voltage of dividing potential drop and AC value.Usually, the pressure drop of secondary circuit is the voltage magnitude before the compensation, and compensation back secondary circuit voltage drop has only tens millivolts, considers the input dynamic range of AC value-DC converting circuit and the range of tension measuring circuit.Need carry out dividing potential drop to the output of sample circuit: bleeder circuit is finished by the precision resistance of a series of series connection.AC value-DC converting circuit that the conversion of AC value is made up of operational amplifier OP07 and respective peripheral element is finished.
The final output of change-over circuit be one over the ground, comprise the DC level of tested voltage AC value information, this voltage is sent to voltage measurement and display circuit.Be sampled there, handle, decipher, show that these work are realized by a slice integral chip ICL7136.What display screen adopted is 31/2 general LCD display.
Bus preference pattern of sending here from control module and positional information and light corresponding light emitting diode at display module respectively from the failure message that detection module is sent here are presented on the panel.
Display circuit has been abandoned the common simulation bar section display mode of other compensator, and adopt digital form to before compensating and the magnitude of voltage of the PT secondary voltage drop after the compensation show accurately, the user just can understand the compensation effect of compensator intuitively by size and the secondary circuit voltage after the compensation and the difference of PT output voltage of keyboard operation Direct observation secondary circuit voltage drop like this.
The technical indicator of compensator
1, compensation accuracy: the width of cloth is poor≤and ± 0.04%
Angular difference≤± 1 (branch)
2, compensation range: the width of cloth is poor≤and ± 5%
Angular difference≤180 (branch)
3, load capacity: load current 0-800mA
4, additional waveform distortion:＜0.05%
5, operating voltage range: 165V-265VAC (50Hz)
6, environment temperature :-10 ℃-50 ℃
7, envionmental humidity :≤85%.
Claims (3)
1, a kind of New Digital PT secondary voltage drop automatic gauge compensator comprises power module, compensating module, detection module, digital control module and display module; It is characterized in that compensating module is connected with detection module; Detection module is connected with digital control module, and digital control module is connected with display module, and power module provides reliable working power for compensator.
2, automatic gauge compensator as claimed in claim 1, it is characterized in that the compensator compensates module be one based on having of adaptive principle of degenerative closed loop configuration.
3, automatic gauge compensator as claimed in claim 1; it is characterized in that the compensator power module is made up of four switch power modules; power control relay is connected after system powers on; when detecting secondary circuit failure, system disconnects; cut off the power supply of equalizing network, protection compensates electrical equipment and power supply is implemented intelligent management.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250175 CN2720451Y (en) | 2003-09-01 | 2003-09-01 | Digital PT secondary voltage-drop automatic metering compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03250175 CN2720451Y (en) | 2003-09-01 | 2003-09-01 | Digital PT secondary voltage-drop automatic metering compensator |
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| CN2720451Y true CN2720451Y (en) | 2005-08-24 |
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| CN 03250175 Expired - Fee Related CN2720451Y (en) | 2003-09-01 | 2003-09-01 | Digital PT secondary voltage-drop automatic metering compensator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945350B (en) * | 2006-09-30 | 2010-04-14 | 太原市优特奥科电子科技有限公司 | Detecting method and device for electric energy metering secondary coop composition error |
| CN101630583B (en) * | 2009-06-27 | 2011-08-10 | 侯君鹏 | Multi-functional current transformer automatic error compensator |
| CN106843355A (en) * | 2017-03-01 | 2017-06-13 | 广州今闰能源科技有限公司 | A kind of zero current secondary voltage drop dynamic compensating device |
-
2003
- 2003-09-01 CN CN 03250175 patent/CN2720451Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1945350B (en) * | 2006-09-30 | 2010-04-14 | 太原市优特奥科电子科技有限公司 | Detecting method and device for electric energy metering secondary coop composition error |
| CN101630583B (en) * | 2009-06-27 | 2011-08-10 | 侯君鹏 | Multi-functional current transformer automatic error compensator |
| CN106843355A (en) * | 2017-03-01 | 2017-06-13 | 广州今闰能源科技有限公司 | A kind of zero current secondary voltage drop dynamic compensating device |
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| CF01 | Termination of patent right due to non-payment of annual fee |