CN203396802U - Electric energy metering stabilizing device - Google Patents
Electric energy metering stabilizing device Download PDFInfo
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- CN203396802U CN203396802U CN201320300593.4U CN201320300593U CN203396802U CN 203396802 U CN203396802 U CN 203396802U CN 201320300593 U CN201320300593 U CN 201320300593U CN 203396802 U CN203396802 U CN 203396802U
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Abstract
The utility model provides an electric energy metering stabilizing device comprising an electric energy output terminal and an input terminal metering device, and the electric energy output terminal is connected with the input terminal metering device through a cable, The electric energy metering stabilizing device is characterized in that the electric energy output terminal is provided with an acquisition interface, the input terminal metering device is provided with a recovery interface, and the acquisition interface is connected with the recovery interface through an optical cable. Beneficial effects of the electric energy metering stabilizing device are that secondary output analog voltage signals are digitized locally, digital light pulse signals are sent based on an ARM technology, information contained by the device almost has no attenuation and distortion, reconstruction difficulty and construction quantity are small at the same time, original lines and layout are not changed, and relevant benefits of power transmission companies and electricity users are maintained at the same time.
Description
Technical field
The utility model relates to power technology field, relates in particular to a kind of electric energy metrical stabilising arrangement.
Background technology
Electric energy is a kind of commodity, and along with the market operation of electric power enterprise, electric energy metering error is just more and more subject to the attention of grid company.Voltage transformer secondary voltage drop error, caused error is negative error mostly, make the interests of electric company be subject to serious loss, to safe operation of power system, be also that a kind of potential threat is because outdoor voltage transformer (VT) is general and the electric energy meter apart from each other of pulpit simultaneously, therebetween except the secondary wiring connecting, also have the electrical equipments such as switch, insurance, terminal row, the contact resistance of these elements is random variation, uncertain, the pressure drop causing in secondary circuit is larger, and being a dynamic variable, is the main cause that produces error in dipping.According to the regulation of " electric power meter technical management rules " DL/T448-2000: " Voltage Transformer Secondary Circuit Voltage Drop, to I class charging measuring apparatus, should be not more than 0.25% of rated secondary voltage; Other measuring apparatus, should be not more than 0.5% of rated secondary voltage, so electrical network must drop into the transformation that a large amount of expenses reduces pressure drop every year.
Voltage transformer device is on-the-spot at converting equipment, and secondary voltage need to be received pulpit by tens meters of cables to hundreds of rice and various auxiliary contact, for potential winding and the voltage circuit of relay protection, aut.eq., measurement instrument.Existence due to secondary circuit cable wire and various auxiliary contact direct current resistances, at cable two ends, having produced secondary voltage drop (is Secondary Circuit of Potential Transformer line drop, be called for short " secondary voltage drop "), load terminal voltage is lied prostrate lower than PT terminal voltage U, amplitude (no-load voltage ratio) and phase angle error have been produced, some Secondary Circuit of Potential Transformer pressure drop is severe overweight especially, not only affected the stable operation of secondary circuit, and directly affect the accuracy of gate energy meter measuring apparatus, cause electric power enterprise to leak meter electric energy, to safe operation of power system, be also a kind of potential threat simultaneously.
Secondary Circuit of Potential Transformer line impedance---in Secondary Circuit of Potential Transformer, contain the elements such as terminal box, switch, cable and knob terminal, certainly exist impedance loop.From equiva lent impedance angle analysis, Secondary Circuit of Potential Transformer middle impedance is divided into: direct impedance and contact impedance.In direct impedance part, the impedance of cable accounts for main body, its reason be the Secondary Circuit of Potential Transformer length of using cable 100 meters and more than, select the cross section of cable to there is considerable influence to its resistance for this reason; Contact impedance be partly the elements such as terminal box, switch and knob terminal for realize is connected object generation patch, rotate impedance sum, this part impedance changes along with the variation of environment, time, there is certain time variation, such as envionmental humidity increases, will cause contact impedance to reduce, after contact point corrosion, contact impedance can increase again, contact impedance can be subject to artificial impact again simultaneously, and such as responsible maintenance personal regularly clears up contact point, contact impedance is just relatively smaller like this.The self-resistance of wire or other element belongs to metallic resistance, steady in a long-term constant, the contact resistance of element, its resistance is unsettled, be subject to the impact of the factors such as contact point state and pressure and surface in contact oxidation, resistance inevitably changes, and this variation is random, does not predict again.The resistance of contact resistance is under rough sledding, by also larger than the resistance of secondary wiring itself, sometimes even large to several times.In test, secondary line pressure drop is conventionally all large many than calculated value, and its basic reason is exactly not estimate that contact resistance has so large variation.For this reason, passable from qualitative angle, the resulting impedance of Secondary Circuit of Potential Transformer changes, and this variation has randomness.
Secondary Circuit of Potential Transformer electric current---Secondary Circuit of Potential Transformer impedance comprises circuit equiva lent impedance Z1 and instrument equiva lent impedance ZL, and under the constant condition of electromotive force, the electric current passing through in secondary circuit is relevant with Z1 and ZL.Secondary Circuit of Potential Transformer circuit equiva lent impedance Z1 is random variation; In real work, Secondary Circuit of Potential Transformer instrument equiva lent impedance ZL also changes, and this causes because need of work increases or reduce measuring instrument quantity.According to Ohm law, we know that the electric current passing through in the secondary circuit of voltage transformer (VT) also changes, and have certain randomness.
Accurately whether electric energy metrical, is directly connected to the interests of power supply unit and Subscriber Unit, is also related to normally carrying out of economic benefit that power industry produces and technical economical index supervision examination work.Therefore, rationally charging, reduce the wastage, save the energy, raise labour productivity, all depend on the raising of electric energy metrical accuracy.The accuracy of electric power meter, relates to the important step of electric industry unit-economy benefit, along with electrical network economy benefit is more paid attention to and the enforcement of time sharing electrical energy examination, the accuracy of electric energy metrical is proposed to higher requirement.As the PT secondary voltage drop problem that causes one of the key factor of electric power meter error, should cause the enough attention of power supply unit.
By data, being calculated and be facts have proved and draw: secondary circuit voltage falls excessive, is the key point that causes electric energy metering error to increase, and does not solve the excessive problem of pressure drop and just cannot realize accurate-metering at all.According to not exclusively investigation and the demonstration of Practical on-site test result, PT secondary circuit voltage drop is one " hard nut to crack " at present, and " always " having electric power meter just to have this problem, can still not solve completely so far; " greatly " having the PT secondary circuit voltage drop of considerable electric power meter overproof, have to surpass several times of permissible value even larger; " difficulty " is difficult in transformation, and some PT are connected to a lot of equipment bis-times, and the load of secondary is very heavy, even the sectional area of wire of PT secondary circuit is increased to 16M2, does not still reach requirement.
According to the regulation of electric power meter rule of management DL/T448-2000, Secondary Circuit of Potential Transformer pressure drop, to I class, for the electric power meter of trade settlement, (its object comprises that 5,000,000 kilowatts of monthly average power consumptions and above transformer capacity are 10000KVA and above high pressure user's fee, electric weight exchange spot between enterprises of managing electric wire netting, the electric power meter of the power supply critical point stoichiometric point of Yu Qi power supply enterprise of provincial power network distributors) and II class for the electric power meter of trade settlement, (its object comprises that 1,000,000 kilowatts of monthly average power consumptions and above transformer capacity are 2000KVA and above high pressure user's fee, the electric power meter of the electric weight exchange spot between power supply enterprise) in, Voltage Transformer Secondary Circuit Voltage Drop should be not more than 0.2% of rated secondary voltage, other classification measuring apparatus should be not more than 0.5% of rated secondary voltage
So consider from the accuracy of measuring apparatus, the pressure drop transformation of carrying out Secondary Circuit of Potential Transformer is necessary.
In prior art to having addressed the above problem following several mode:
Reduce line impedance method: reducing line resistance is more tangible way, its advantage is, system is simple, and error can be only that instrument side magnitude of voltage is less than PT side magnitude of voltage, and error range is little.Reliability is strong.But because the existence of the stray inductance electric capacity of transmission line, the method cannot be reduced to ideal value by error, can not guarantee that secondary voltage drop is not more than 0.25% requirement of voltage transformer secondary outlet voltage all the time.
Adopt special measuring loop: adopt special-purpose voltage transformer secondary measure winding, avoid relay protection, the impact of measuring circuit on measurement loop; Adopt special-purpose metering secondary cable and special-purpose switch, fuse and connection terminal etc.This measure can reduce Voltage Transformer Secondary Circuit Voltage Drop from the angle of equipment configuration, but owing to also there being the equipment such as wire, switch, fuse and connection terminal, the PT secondary voltage drop causing more greatly because of their contact resistance is larger, is difficult to meet 0.25% the requirement that should be not more than its rated secondary voltage to Voltage Transformer Secondary Circuit Voltage Drop in I class electric power meter.
Watt-hour meter is tuned up to method: according to primary circuit, consume average that the real component of electric energy and idle component calculate, and the PT secondary wiring pressure drop recording, can calculate the caused electric energy metering error value of PT secondary wiring pressure drop, watt-hour meter is tuned up, in order to offset the caused negative error of secondary wiring pressure drop.But when changing when excessive or excessive, all should not adopt this method, meanwhile, this measure is unallowed in electric energy measuring management regulation, and because pressure drop has the feature of real-time change.
Penalty method: adopt voltage error compensator to compensate ratio and the angular difference that secondary wiring pressure drop causes, its principle is to add a bucking voltage, the ratio and the angular difference that cause in order to compensate secondary wiring pressure drop in secondary circuit.The device that produces this bucking voltage has multiple: fixed value compensation device, current tracking formula compensator, voltage-tracing formula compensator.The shortcoming of these class methods is that its compensation effect is difficult to assessment, and easily over-compensation, from the Ke Shuo source angle of metering, exists the defect of principle, cannot make user convince.
The switch of cancellation PT secondary circuit, fuse, terminal row etc.: the PT secondary voltage drop that this measure can avoid the contact resistance of switch, fuse, terminal row to cause; but cancel after switch, fuse equipment; metering secondary lose emergency protection, consequence is serious.
Electric energy meter is contained in outside the outlet of PT secondary side: transformation difficulty and quantities are larger, the working temperature of measuring screen is difficult to guarantee, destroys existing transformer station layout, has the problems such as inconvenient of safeguarding.
Periodic maintenance: the contact portion to knife-like switch, auxiliary switch, fuse, terminal is polished, or cancel these elements." polishing " scheme of employing has increased PT secondary circuit maintenance workload, adopts element solution such as cancelling fuse to be unfavorable for the safe operation of PT.
Building-out capacitor: concentrate at master-control room electric energy meter screen place or each electric energy meter installs static compensation electric capacity outward additional, with the inductance current of compensation PT secondary circuit, PT secondary voltage drop also declines thereupon, and this way investment economizes, but in practical operation, there is certain difficulty, DeGrain.
Utility model content
Problem to be solved in the utility model is to provide a kind of electric energy metrical stabilising arrangement.
The technical solution of the utility model is as follows: a kind of electric energy metrical stabilising arrangement, comprise electric energy output end and input end measuring apparatus, and described electric energy output end is connected by cable with input end measuring apparatus; It is characterized in that: described electric energy output end is provided with acquisition interface, described input end measuring apparatus is provided with restoration interface, between described acquisition interface and restoration interface, by optical cable, is connected;
Described acquisition interface comprises analog to digital converter, the first photoelectric commutator and the first optical cable socket; Described analog to digital converter is electrically connected to electric energy output end, and described analog to digital converter is converted to digital signal by the analog voltage signal of secondary output; Described analog to digital converter is electrically connected to the first photoelectric commutator, and the digital signal that the first photoelectric commutator is changed out analog to digital converter is converted to digital light pulse signal; Described the first photoelectric commutator is electrically connected to the first optical cable socket;
Described restoration interface comprises the second optical cable socket, the second photoelectric commutator and digital to analog converter; Described the second optical cable socket is connected with the first optical cable interface circuit by optical cable; Described the second photoelectric commutator is electrically connected to the second optical cable socket, and the digital light pulse signal that the second optical cable socket is derived is converted to digital signal; Described the second photoelectric commutator is electrically connected to digital to analog converter, and the digital signal that digital to analog converter is derived the second photoelectric commutator is converted to analog voltage signal again.
Further, described acquisition interface also comprises signal conditioner, carries out the removal of impurities work of signal.
Further, described restoration interface also comprises signal amplifier, to meet the measuring requirement of input end measuring apparatus.
The beneficial effects of the utility model are: by the utility model electric energy metrical stabilising arrangement, by after the analog voltage signal in-situ digitalization of secondary output, and based on ARM technology, digital light pulse signal is sent, its information comprising is almost without any decay and distortion, transform difficulty and construction volume all smaller simultaneously, do not change original circuit and layout, safeguarded the relevant benefit of transmission of electricity side with electricity consumption side simultaneously.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is made to brief description.
As shown in Figure 1, a kind of electric energy metrical stabilising arrangement, comprises electric energy output end and input end measuring apparatus, and described electric energy output end is connected by cable with input end measuring apparatus; Described electric energy output end is provided with acquisition interface, and described input end measuring apparatus is provided with restoration interface, between described acquisition interface and restoration interface, by optical cable, is connected;
Described acquisition interface comprises signal conditioner, analog to digital converter, the first photoelectric commutator and the first optical cable socket; Described signal conditioner carries out the removal of impurities work of signal; Described analog to digital converter is electrically connected to electric energy output end, and described analog to digital converter is converted to digital signal by the analog voltage signal of secondary output; Described analog to digital converter is electrically connected to the first photoelectric commutator, and the digital signal that the first photoelectric commutator is changed out analog to digital converter is converted to digital light pulse signal; Described the first photoelectric commutator is electrically connected to the first optical cable socket;
Described restoration interface comprises the second optical cable socket, the second photoelectric commutator, digital to analog converter and amplifier; Described the second optical cable socket is connected with the first optical cable interface circuit by optical cable; Described the second photoelectric commutator is electrically connected to the second optical cable socket, and the digital light pulse signal that the second optical cable socket is derived is converted to digital signal; Described the second photoelectric commutator is electrically connected to digital to analog converter, and the digital signal that digital to analog converter is derived the second photoelectric commutator is converted to analog voltage signal again.Described signal amplifier meets the measuring requirement of input end measuring apparatus, the 57.7v being amplified to or 100v to electric energy meter as input signal.
Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (3)
1. an electric energy metrical stabilising arrangement, comprises electric energy output end and input end measuring apparatus, and described electric energy output end is connected by cable with input end measuring apparatus; It is characterized in that: described electric energy output end is provided with acquisition interface, described input end measuring apparatus is provided with restoration interface, between described acquisition interface and restoration interface, by optical cable, is connected;
Described acquisition interface comprises analog to digital converter, the first photoelectric commutator and the first optical cable socket; Described analog to digital converter is electrically connected to electric energy output end; Described analog to digital converter is electrically connected to the first photoelectric commutator; Described the first photoelectric commutator is electrically connected to the first optical cable socket;
Described restoration interface comprises the second optical cable socket, the second photoelectric commutator and digital to analog converter; Described the second optical cable socket is connected with the first optical cable interface circuit by optical cable; Described the second photoelectric commutator is electrically connected to the second optical cable socket; Described the second photoelectric commutator is electrically connected to digital to analog converter.
2. a kind of electric energy metrical stabilising arrangement according to claim 1, is characterized in that: described acquisition interface also comprises signal conditioner.
3. a kind of electric energy metrical stabilising arrangement according to claim 1, is characterized in that: described restoration interface also comprises signal amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320300593.4U CN203396802U (en) | 2013-05-28 | 2013-05-28 | Electric energy metering stabilizing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320300593.4U CN203396802U (en) | 2013-05-28 | 2013-05-28 | Electric energy metering stabilizing device |
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| CN203396802U true CN203396802U (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320300593.4U Expired - Fee Related CN203396802U (en) | 2013-05-28 | 2013-05-28 | Electric energy metering stabilizing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096044A (en) * | 2015-07-27 | 2015-11-25 | 国网天津市电力公司 | Dynamic management system for power metering calibration device |
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2013
- 2013-05-28 CN CN201320300593.4U patent/CN203396802U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096044A (en) * | 2015-07-27 | 2015-11-25 | 国网天津市电力公司 | Dynamic management system for power metering calibration device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20160528 |