CN205301567U - Special high tension current transformer calibration system - Google Patents
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- CN205301567U CN205301567U CN201620023052.5U CN201620023052U CN205301567U CN 205301567 U CN205301567 U CN 205301567U CN 201620023052 U CN201620023052 U CN 201620023052U CN 205301567 U CN205301567 U CN 205301567U
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Abstract
The utility model discloses a special high tension current transformer calibration system, close reactive power compensator, multiunit including intelligent power frequency power supply, multiunit and close the stream system that rises, standard current transformer, the current transformer case of loading, the utility model discloses a monophase power power electronic power of three phase transitions and electrician power series's modern power electronic semiconductor converting technology, self -adaptation reactive compensation technique and intelligent inspection technology, an intelligence test circuit's in the efficient assay extra -high voltage GIS pipeline load parameter and according to the automatic reactive compensation that carries on of load parameter, reduce on -the -spot power greatly and rise the capacity and the volume of stream equipment, the examination device integration ization of dispersion has been realized, it is miniaturized, the efficiency of on -the -spot checking feature and work is improved, manpower and materials cost is reduced, solve and on -the -spotly can not carry out a difficult problem of examining and determine according to the examination rules to special high tension current transformer.
Description
Technical field
The invention belongs to extra-high voltage technical field of measurement and test, particularly a kind of extra-high voltage current transformer check system.
Background technology
It is large that extra-high voltage GIS current transformer has no-load voltage ratio, pipeline loop is long, integrated level is high, the features such as totally-enclosed property, can not current transformer is independent when on-site proving, need to bring very long pipeline bus and some electrical equipments, test loop impedance is large, as GIS current transformer test loop in East Lanzhou ultra-high voltage transformer station reaches 390 meters, like this for large velocity ratio, the experiment power supply and the up-flow place capacity that when primary circuit long extra-high voltage GIS current mutual inductor field detecting, need are huge, as the extra-high voltage current transformer of a 4000A/1A in 200 meters of GIS loops, under 120% rated current, needing power supply capacity is 800kVA left and right, wherein real component is about 200kVA left and right, idle component is about 750kVA left and right. if adopt the scheme of traditional current lifting device, need power supply capacity and the current lifting device capacity of 800kVA left and right, rely on the capacity increase of traditional current lifting device and field trial power supply to be also difficult to meet calibrating requirement, and jumbo current lifting device volume is large, Heavy Weight, execute-in-place difficulty is very big.
In ultra-high voltage transformer station current mutual inductor field detecting, generally all adopt at present indirect test method both at home and abroad: the one, little electric current extrapolation, the in the situation that of little electric current, carry out the work magnetic flux under the large electric current of simulated current transformer by the method that increases current transformer load, then error is carried out to emulation reckoning by the mode that load is extrapolated; The 2nd, small voltage method meter algorithm, applies small voltage in Current Transformer Secondary, measures its parameter, according to the Mathematical Modeling of current transformer and error expression, calculates the error of current transformer. These two kinds of indirect test methods have been evaded current lifting device, pressure regulator and the excessive problem of field power supply capacity requirement, the entrained equipment volume of field trial is dwindled greatly, weight saving, but indirect test method all can not meet the regulation of " JJG1021-2007 electric power mutual-inductor " vertification regulation, can not obtain the current transformer true error under large current conditions, reduce reliability and the authenticity of test data. According to extra-high voltage current mutual inductor field detecting statistics, current transformer is more in the overproof situation of upper limit error, particularly near rated current scope, along with the increase of test current, error increases, the reason that causes this phenomenon may be that current mutual inductor coil material is given a shock in installation, transportation, cause iron core relative permeability to decline, near rated current, magnetic circuit is saturated causes that error sharply changes, so little electric current extrapolation, can not find this phenomenon, cause examining and determine data not true and reliable; Adopt small voltage meter algorithm also to have problems, one, although the principle of current transformer is similar, but for current transformer of the same type to be examined and determine, equivalent degree between the Mathematical Modeling that it is desirable and actual current transformer is more difficult definite, although can be by analog simulation and a large amount of test checking that compares, workload is undoubtedly huge; They are two years old, even if obtained the Mathematical Modeling of the current transformer of a type, but the core material, winding mode, mounting means, the compensation way that in product design, production process, adopt for each current transformer manufacturer are all different, wanting to set up unified Mathematical Modeling is difficult to realize, the measurement result obtaining with this Mathematical Modeling is often difficult to reflect real error information, particularly, for balanced current transformer, have no idea its error to measure; They are three years old, obtain accurate Mathematical Modeling, just must accurately measure the electric parameter of current transformer, for small voltage method, the voltage of its measurement and electric current are extremely small, accurately record electric parameter more difficult, and while carrying out current mutual inductor field detecting, the stronger interference of on-the-spot often existence, under this operating mode, measure, just more be difficult to record accurate electric parameter, be also therefore difficult to obtain accurate Mathematical Modeling, so the error information that adopts small voltage method meter algorithm to obtain is difficult to reflect the real error information of current transformer. Above-mentioned two kinds of indirect methods not only can not effectively be examined and determine transformer, but also may judge by accident, so particularly important in the error of each measurement point on-site proving extra-high voltage current transformer according to the requirement of " JJG1021-2007 electric power mutual-inductor " vertification regulation.
In view of the limitation of current mutual inductor field detecting condition in extra-high voltage GIS, the complexity of operation, above-mentioned traditional current lifting device method and indirect test method all can not meet on-site proving requirement.
Summary of the invention
Goal of the invention: the invention provides a kind of extra-high voltage current transformer check system, to solve the problems of the prior art.
Technical scheme: to achieve these goals, the present invention by the following technical solutions:
A kind of extra-high voltage current transformer check system, comprises intelligent power frequency supply, combines reactive power compensator more, combines up-flow system, standard current transformer, current transformer load box more; Wherein, the one side of combining the former limit of reactive power compensator part is connected with the output of intelligent power frequency supply more, and the another side that combines the former limit of reactive power compensator part is connected with many combination up-flow system inputs more; One side of many combination reactive power compensator secondary parts is connected with many combinations up-flow system output, the another side of many combination reactive power compensator secondary parts connects successively by school extra-high voltage current transformer and standard current transformer, tested extra-high voltage current transformer is also connected with current transformer load box, and tested extra-high voltage current transformer is connected with intelligent power frequency supply respectively with standard current transformer.
Further, described intelligent power frequency supply is composed in series by power electronic power supply and electrician's formula power supply, wherein: power electronic power supply capacity is 200kVA, change by AC-DC-AC, three-phase imbalance 0～380V AC power is converted to the single phase ac balance power supply of 0～400V; Described electrician's formula power supply capacity is 20kVA, electrician's formula power supply is made up of main voltage regulator and isolating transformer, isolating transformer plays isolation voltage and auxiliary pressure regulation, electrician's formula power supply is by main voltage regulator homophony, it is 0～40V that isolating transformer fine setting realizes voltage, and regulating fineness is the power supply output that 0.1V waveform is good.
Further, described electrician's formula power supply waveform stabilization under small power supply, therefore in the time that the power output of demand is 0～20kVA, intelligent power frequency supply is set to zero the output of power power electronics power supply, the way of output is program control electrician's formula power supply output; When demanded power output is greater than 20kVA, the way of output is the input of connecting with electrician's formula power supply of power power electronics power supply, and it is that 0～220kVA, voltage are 0～440V, regulate the power supply output of the little fineness of wide region that fineness is 0.1V that this intelligence power frequency supply has been realized capacity.
Further, described intelligent power frequency supply energy automatic analysis rises to compensation way required under rated current and compensation rate when front loop; Intelligence power frequency supply is exported 5～10% rated current under uncompensated state, by measuring the parameter of voltage, current amplitude and phase place of primary circuit, obtain equiva lent impedance and equivalent inductive reactance and the power factor (PF) in current verification loop, judge compensation rate required when current check system rises to 120% rated current, and many combined compensations of switching device is until check system power factor (PF) reaches more than 0.98, stops many combined compensations of switching device.
Further, described intelligent power frequency supply is controlled compensation way and the compensation rate of switching reactive compensator automatically.
Further, described intelligent power frequency supply tape verifying instrument function, poor stream signal and the secondary current signal of described standard current transformer and tested current transformer are inputted in intelligent power frequency supply by holding wire, obtain check system error.
Further, described intelligent power frequency supply is provided with display screen, on the same interface of display screen, demonstrate input and output, the power factor situation of resonant condition, electric current and voltage, testing crew can monitor all parameters of pilot system on an interface, can also be according to resonant condition manual adjustments input size, can prevent that the dangerous situation that electric current skyrockets from occurring.
Further, described intelligent power frequency supply connects current transformer load box by control line, intelligent power frequency supply control current transformer load box switching secondary load.
Further, described many combination reactive power compensators are made up of two group capacitor groups, wherein a group capacitor group is made up of 4 different capacitors of capacitance, be connected in parallel on many combinations former limit of up-flow system, another group capacitor group is made up of 5 different capacitors of capacitance, is connected in parallel on many combination up-flow system secondary.
Further, the large electric current current lifting device that described many combination up-flow systems are 1800A/40V by 4 capacity forms, possess multiple combination mode, can form 1800A/40V, 1800A/80V, 1800A/120V, 1800A/160V, 3600A/40V, 3600A/80V, 3600A/120V, 4800A/40V, 4800A/80V, ten kinds of way of outputs of 7200A/40V.
Beneficial effect: the modern power electronic Semiconductor Converting Technology that the present invention has adopted the single-phase power power electronics power supply of three phase transformations to connect with electrician's power supply, self adaptation reactive power compensation technology and intelligent Calibration Technology, the load parameter in the analysis extra-high voltage GIS pipeline single test loop of intelligent and high-efficiency also carries out reactive-load compensation automatically according to load parameter, greatly reduce capacity and the volume of field power supply and up-flow equipment, realize the calibration equipment disperseing integrated, miniaturization, improve field-checking ability and operating efficiency, reduce manpower and materials cost, solve the on-the-spot difficult problem that can not examine and determine according to vertification regulation extra-high voltage current transformer.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the present invention's intelligence power frequency supply work block diagram;
Fig. 3 is primary circuit of the present invention isoboles.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in the figure, a kind of extra-high voltage current transformer check system, comprises intelligent power frequency supply, combines reactive power compensator more, combines up-flow system, standard current transformer, current transformer load box more; Wherein, the one side of combining the former limit of reactive power compensator part is connected with the output of intelligent power frequency supply more, and the another side that combines the former limit of reactive power compensator part is connected with many combination up-flow system inputs more; One side of many combination reactive power compensator secondary parts is connected with many combinations up-flow system output, the another side of many combination reactive power compensator secondary parts connects successively by school extra-high voltage current transformer and standard current transformer, tested extra-high voltage current transformer is also connected with current transformer load box, and differential pressure signal and the secondary current signal of tested extra-high voltage current transformer and standard current transformer are transferred in intelligent power frequency supply by holding wire.
Described intelligent power frequency supply is composed in series by power electronic power supply and electrician's formula power supply, wherein: power electronic power supply capacity is 200kVA, changes by AC-DC-AC, three-phase imbalance 0～380V AC power is converted to the single phase ac balance power supply of 0～400V; Described electrician's formula power supply capacity is 20kVA, electrician's formula power supply is made up of main voltage regulator and isolating transformer, isolating transformer plays isolation voltage and auxiliary pressure regulation, electrician's formula power supply is by main voltage regulator homophony, it is 0～40V that isolating transformer fine setting realizes voltage, and regulating fineness is the power supply output that 0.1V waveform is good.
Described electrician's formula power supply waveform stabilization under small power supply, therefore in the time that the power output of demand is 0～20kVA, intelligent power frequency supply is set to zero the output of power power electronics power supply, the way of output is program control electrician's formula power supply output; When demanded power output is greater than 20kVA, the way of output is the input of connecting with electrician's formula power supply of power power electronics power supply, and it is that 0～220kVA, voltage are 0～440V, regulate the power supply output of the little fineness of wide region that fineness is 0.1V that this intelligence power frequency supply has been realized capacity.
Described intelligent power frequency supply energy automatic analysis is worked as front loop and is risen to compensation way required under rated current and compensation rate; Intelligence power frequency supply is exported 5～10% rated current under uncompensated state, by measuring the parameter of voltage, current amplitude and phase place of primary circuit, calculate equiva lent impedance and equivalent inductive reactance and the power factor (PF) in current verification loop, judge compensation rate required when current check system rises to 120% rated current, and many combined compensations of switching device until check system power factor (PF) reach more than 0.98, stop many combined compensations of switching device, think that many combination reactive power compensators reach the optimal compensation state.
Described intelligent power frequency supply is controlled compensation way and the compensation rate of switching reactive compensator automatically.
Poor stream signal and the secondary current signal of described standard current transformer and tested current transformer are inputted in intelligent power frequency supply by holding wire, obtain the error amount of check system by trigonometric function operation, make intelligent power frequency supply tape verifying instrument function.
Described intelligent power frequency supply is provided with display screen, on the same interface of display screen, demonstrate input and output, the power factor situation of resonant condition, electric current and voltage, testing crew can monitor all parameters of pilot system on an interface, can also be according to resonant condition manual adjustments input size, can prevent that the dangerous situation that electric current skyrockets from occurring.
Described intelligent power frequency supply connects current transformer load box by control line, intelligent power frequency supply control current transformer load box switching secondary load.
Described many combination reactive power compensators are made up of two group capacitor groups, wherein a group capacitor group is made up of 4 different capacitors of capacitance, be connected in parallel on many combinations former limit of up-flow system, another group capacitor group is made up of 5 different capacitors of capacitance, is connected in parallel on many combination up-flow system secondary.
The large electric current current lifting device that described many combination up-flow systems are 1800A/40V by 4 capacity forms, possess multiple combination mode, can form 1800A/40V, 1800A/80V, 1800A/120V, 1800A/160V, 3600A/40V, 3600A/80V, 3600A/120V, 4800A/40V, 4800A/80V, ten kinds of way of outputs of 7200A/40V.
Extra-high voltage current transformer check system disclosed by the invention by intelligent power frequency supply, combine reactive power compensator more, combine up-flow system more, standard current transformer, current transformer load box form. Described many combinations reactive power compensator (former limit part) is connected with the output of intelligent power frequency supply on one side, another side is connected with many combination up-flow system inputs, many combination reactive power compensators (secondary part) are connected with many combinations up-flow system output on one side, another side be connected by school extra-high voltage current transformer and standard current transformer primary side, be connected with current transformer load box by school extra-high voltage current transformer. Current transformer load box meets configuration signal, combines reactive power compensator control signal more, error of measurement signal, electric current dial gauge signal are connected to intelligent power frequency supply.
First select the combination of many combination up-flow systems according to tested extra-high voltage current mutual-inductor parameter, require wiring according to Fig. 1 again, after system wiring, first by intelligent power frequency supply as for running status, be adjusted to again manual mode, regulate intelligent power frequency supply that reactive power compensator is put into uncompensated state, then export 5～10% rated current, by measuring the voltage of primary circuit, the amplitude of electric current, the parameter of phase place, in intelligent power frequency supply, calculate the equiva lent impedance of primary circuit and equivalent inductive reactance automatic analysis by program and rise to compensation way required under rated current and compensation rate when front loop. described intelligent power frequency supply has two holding wires that are connected with the former secondary of many combination reactive power compensators, can control switching reactive compensation capacitor compensation way and compensation rate, according to the Best Compensation and compensation rate switching building-out capacitor, reaches the optimal compensation effect. after this action completes, intelligent power frequency supply is adjusted to automatic mode, described intelligent power frequency supply has a control signal being connected with current transformer load box, can control automatic switching load, now intelligent power frequency supply will be controlled extra-high voltage current transformer check system and realize 1%I by codeN、5%IN、20%IN、100%IN、120%INError checking in situation under unloaded and full load conditions, and test data is stored in to intelligent power frequency supply.
Primary circuit comprises: tested current transformer, standard current transformer, combine up-flow system, breaker, splicing ear, connection wire, GIS pipeline more.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. an extra-high voltage current transformer check system, is characterized in that: comprise intelligent power frequency supply, combine reactive power compensator more, combine up-flow system, standard current transformer, current transformer load box more; Wherein, the one side of combining the former limit of reactive power compensator part is connected with the output of intelligent power frequency supply more, and the another side that combines the former limit of reactive power compensator part is connected with many combination up-flow system inputs more; One side of many combination reactive power compensator secondary parts is connected with many combinations up-flow system output, the another side of many combination reactive power compensator secondary parts connects successively by school extra-high voltage current transformer and standard current transformer, tested extra-high voltage current transformer is also connected with current transformer load box, and tested extra-high voltage current transformer is connected with intelligent power frequency supply respectively with standard current transformer.
2. extra-high voltage current transformer check system according to claim 1, it is characterized in that: described intelligent power frequency supply is composed in series by power electronic power supply and electrician's formula power supply, wherein: power electronic power supply capacity is 200kVA, described electrician's formula power supply capacity is 20kVA, electrician's formula power supply is composed in series by main voltage regulator and isolating transformer, it is 0～40V that isolating transformer fine setting realizes voltage, regulates the power supply output that fineness is 0.1V.
3. extra-high voltage current transformer check system according to claim 1, is characterized in that: described intelligent power frequency supply is provided with display screen, demonstrates input and output, the power factor situation of resonant condition, electric current and voltage on the same interface of display screen.
4. extra-high voltage current transformer check system according to claim 1, is characterized in that: described intelligent power frequency supply connects current transformer load box by control line, intelligent power frequency supply control current transformer load box switching secondary load.
5. extra-high voltage current transformer check system according to claim 1, it is characterized in that: described many combination reactive power compensators are made up of two group capacitor groups, wherein a group capacitor group is made up of 4 different capacitors of capacitance, be connected in parallel on many combinations former limit of up-flow system, another group capacitor group is made up of 5 different capacitors of capacitance, is connected in parallel on many combination up-flow system secondary.
6. extra-high voltage current transformer check system according to claim 1, it is characterized in that: the large electric current current lifting device that described many combination up-flow systems are 1800A/40V by 4 capacity forms, possess multiple combination mode, can form 1800A/40V, 1800A/80V, 1800A/120V, 1800A/160V, 3600A/40V, 3600A/80V, 3600A/120V, 4800A/40V, 4800A/80V, ten kinds of way of outputs of 7200A/40V.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425193A (en) * | 2016-01-12 | 2016-03-23 | 江苏省电力公司电力科学研究院 | Extra-high-voltage current transformer verification system |
| CN105974352A (en) * | 2016-06-20 | 2016-09-28 | 国网天津市电力公司 | Ultra-high voltage current transformer error field test monitoring method |
| CN107271944A (en) * | 2017-06-09 | 2017-10-20 | 国网四川省电力公司电力科学研究院 | A kind of full-automatic termination of program control type current transformer |
| CN107422291A (en) * | 2017-09-14 | 2017-12-01 | 中国电力科学研究院 | A kind of AC extra high voltage voltage transformer error check system and method |
| CN109459717A (en) * | 2018-11-21 | 2019-03-12 | 西安航天计量测试研究所 | A kind of current parameters calibration system and method based on method of offset |
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2016
- 2016-01-12 CN CN201620023052.5U patent/CN205301567U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105425193A (en) * | 2016-01-12 | 2016-03-23 | 江苏省电力公司电力科学研究院 | Extra-high-voltage current transformer verification system |
| CN105974352A (en) * | 2016-06-20 | 2016-09-28 | 国网天津市电力公司 | Ultra-high voltage current transformer error field test monitoring method |
| CN107271944A (en) * | 2017-06-09 | 2017-10-20 | 国网四川省电力公司电力科学研究院 | A kind of full-automatic termination of program control type current transformer |
| CN107271944B (en) * | 2017-06-09 | 2020-06-23 | 国网四川省电力公司电力科学研究院 | Full-automatic wiring device of program-controlled current transformer |
| CN107422291A (en) * | 2017-09-14 | 2017-12-01 | 中国电力科学研究院 | A kind of AC extra high voltage voltage transformer error check system and method |
| CN109459717A (en) * | 2018-11-21 | 2019-03-12 | 西安航天计量测试研究所 | A kind of current parameters calibration system and method based on method of offset |
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Address after: PA Weier road Jiangning District of Nanjing City, Jiangsu Province, No. 1 211103 Co-patentee after: State Grid Corporation of China Patentee after: Electric Power Research Institute of Jiangsu Electric Power Company Co-patentee after: Jiangsu Electric Power Company Co-patentee after: Wuhan pan electric Polytron Technologies Inc Address before: PA Weier road Jiangning District of Nanjing City, Jiangsu Province, No. 1 211103 Co-patentee before: State Grid Corporation of China Patentee before: Electric Power Research Institute of Jiangsu Electric Power Company Co-patentee before: Jiangsu Electric Power Company Co-patentee before: Wuhan Pandian Technology Co., Ltd. |