CN104330761B - Voltage transformer calibrates for error with normal voltage proportioning device and operating method online - Google Patents
Voltage transformer calibrates for error with normal voltage proportioning device and operating method online Download PDFInfo
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Abstract
Calibrated for error online with normal voltage proportioning device and operating method, including inverted type current transformer and low-voltage standards condenser network the invention provides a kind of voltage transformer；The secondary side output end connection of low-voltage standards condenser network and inverted type current transformer, including low-voltage standards capacitor and earthed switch in parallel；When earthed switch is closed, low-voltage standards capacitor does not work, inverted type current transformer normal work；When earthed switch disconnects, low-voltage standards capacitor is as low-voltage arm, and the high-voltage capacitor of inverted type current transformer high-pressure side is as high-voltage arm, to build normal voltage proportioning device, inverted type current transformer normal work.Compared with prior art, a kind of voltage transformer that the present invention is provided calibrates for error online uses normal voltage proportioning device, and voltage transformer can be calibrated for error in the energized state by means of inverted type current transformer.
Description
Technical field
The present invention relates to a kind of normal voltage proportioning device, and in particular to a kind of voltage transformer calibrates for error with mark online
Quasi- voltage ratio device and operating method.
Background technology
In recent years, voltage class of electric power system is improved constantly, and generated energy, power consumption increase severely, while as electric power structure changes
The separation that leather particularly generates electricity, transmitted electricity, the accuracy and fairness of electric energy metrical cause the highest attention of society.Mutual induction of voltage
Device as Electric Energy Tariff Point Metering Device important component, to ensure that it reliably puts into operation, according to《Electric device installing engineering electricity
Gas equipment commissioning test standard》, voltage transformer needed after installing at the scene carry out commissioning test, wherein site error hand over
It is very important part in commissioning test to connect experiment.In Practical Project, the error measure of voltage transformer is typically
Standard set-up is transported to scene, the voltage transformer before installation calibrated for error under off-line state, from the strict sense
Say the inreal commissioning test for carrying out error measure.In addition, according to vertification regulation, the mutual inductance of energy metering is used in power network
Device must periodically carry out error characteristics detection, but in the actually detected middle basic nothing of transformer for finding, being used in some circuits
Method, which has a power failure, to be detected, the normal life of people otherwise can be influenceed to produce；Although some circuits can have a power failure, the offline error of transformer
Detection workload is big, the cycle is long.
Power system primary equipment repair based on condition of component is the inexorable trend of power network development, is also to reduce operating cost, reduction to set
The means of standby accident probability.It is offline to carry out error characteristics detection workload due to voltage transformer substantial amounts in power system
It is huge, waste time and energy, and the True Data under three-phase electriferous state can not be obtained.Accordingly, it is desirable to provide a kind of mutual induction of voltage
Device calibrates for error online uses normal voltage proportioning device, carries out voltage transformer scene band electric calibration to overcome above-mentioned off-line calibration
Shortcoming, error characteristics of voltage transformer uncertainty of measurement level is improved, to realize the overall online school of electric power meter
Standard is taken a firm foundation, and improves the degree of accuracy of electric energy metrical.
The content of the invention
The need for meeting prior art, calibrated for error online the invention provides a kind of voltage transformer and use standard electric
Proportioning device is pressed, described device includes inverted type current transformer and low-voltage standards condenser network；The low-voltage standards electric capacity electricity
The secondary side output end connection of road and inverted type current transformer, including low-voltage standards capacitor and earthed switch in parallel；Institute
The dielectric for stating inverted type current transformer is gas；
During the earthed switch closure, low-voltage standards capacitor does not work, the inverted type current transformer normal work；
When the earthed switch disconnects, low-voltage standards capacitor as low-voltage arm, inverted type current transformer high-pressure side
High-voltage capacitor is as high-voltage arm, to build the normal voltage proportioning device, the inverted type current transformer normal work.
It is preferred that, the inverted type current transformer includes high pressure shell, second siding ring screen layer, primary side conducting rod
With secondary side fairlead；The primary side conducting rod is bolted to connection with high pressure shell, the second siding ring shielding
Layer is connected with secondary side fairlead；Second siding ring screen layer is arranged on high pressure enclosure；
The high pressure shell and primary side conducting rod equipotential, the second siding ring screen layer and secondary side fairlead etc.
Current potential；
The high-voltage capacitor is the high pressure formed between the second siding ring screen layer and the primary side conducting rod
Electric capacity；
It is preferred that, the low-voltage standards condenser network also include trimmer, voltage follower, first order amplifier and
Second level amplifier；
One branch road of the secondary side output end of the inverted type current transformer and the one of the low-voltage standards capacitor
End connection, another branch road is connected with the inverting input of the voltage follower；The other end of the low-voltage standards capacitor
Ground connection；
The voltage follower is connected by resistance R1 with the inverting input of first order amplifier, the inverting input
Adjustable resistance R2 is connected between the output end of first order amplifier；
The output end is connected by resistance R4 with the inverting input of second level amplifier, the inverting input and
Resistance R5 is connected between the output end of two-stage amplifier；The resistance of the resistance R4 and resistance R5 are equal；
The output end of the second level amplifier is the output end of described device, outputting standard signal；
It is preferred that, the trimmer is connected in parallel on the two ends of the low-voltage standards capacitor；By changing trimmer
The size of device capacitance, adjusts the output error of the normal voltage proportioning device so that the output error meets preset
The scope of class of accuracy error limitation；
It is preferred that, the degree of regulation of the first order amplifier is 10-6V；
It is preferred that, the two ends of the low-voltage standards capacitor are parallel with portable protective gaps, exist when on the high-voltage capacitor
During overvoltage, the low-voltage standards condenser network is protected；
Calibrated for error online with normal voltage proportioning device operating method the invention provides a kind of voltage transformer, it is described
Method includes：
Step 1：The primary side of inverted type current transformer high-pressure side and standard potential transformer is connected, by low-voltage standards
The secondary side high-pressure side connection of condenser network and standard mutual inductor；
Step 2：Calculate the standard mutual inductor low pressure terminal voltage value U1The electricity exported with the low-voltage standards condenser network
Pressure value U2Difference DELTA U；
Step 3：Adjust the intrinsic standoff ratio that the trimmer in the low-voltage standards condenser network changes described device, adjustment
Adjustable resistance R2 in low-voltage standards condenser network, changes the phase angle of low-voltage standards condenser network output voltage so that difference
Δ U meets the scope of preset class of accuracy error limitation.
Compared with immediate prior art, excellent effect of the invention is：
1st, a kind of voltage transformer that the present invention is provided calibrates for error online uses normal voltage proportioning device, by means of standing upside down
Formula current transformer is in the distributed capacitor formed between the shielding of the coil of low potential and the tank body in high potential, constitutes electricity
Hold the high-voltage arm of divider, coil bonding terminates the low-voltage arm capacitor into capacitive divider, can be in the energized state
Voltage transformer is calibrated for error.
2nd, a kind of voltage transformer that the present invention is provided calibrates for error online uses normal voltage proportioning device, in inverted electricity
Under current transformer short time off-line state, the standard potential transformer with identical voltage class is in parallel, by standard potential transformer
Ratio pass to the normal voltage proportioning device, normal voltage proportioning device is put into power network in the stipulated time, for online
Verify the error characteristics with mutually each voltage transformer.
3rd, a kind of voltage transformer that the present invention is provided calibrates for error online uses normal voltage proportioning device, by means of power network
The current transformer of operation constitutes the high pressure bearing object of normal voltage proportioning device, has evaded with conventional criteria voltage ratio device
Access the insulation risk of power network.
4th, a kind of voltage transformer that the present invention is provided calibrates for error online uses normal voltage proportioning device, completes with mutually electricity
Transformer error characteristic is pressed after line verification, the earth terminal normal ground work of inverted type current transformer does not influence inverted
Operation of current transformers state.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1：A kind of voltage transformer calibrates for error online in the embodiment of the present invention is shown with normal voltage proportioning device structure
It is intended to；
Fig. 2：The structure chart of inverted type current transformer in Fig. 1；
Fig. 3：Fig. 1 mesolow standard capacitance circuit diagrams；
Fig. 4：A kind of voltage transformer calibrates for error online in the embodiment of the present invention uses the error of normal voltage proportioning device
Calibrate wiring diagram；
Wherein, 1- high pressures shell；2- second siding ring screen layers；3- primary side conducting rods；4- secondary side fairleads；5- believes
Number shell.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
A kind of voltage transformer based on inverted type current transformer that the present invention is provided calibrates for error online uses standard electric
Proportioning device is pressed, access low-voltage standards condenser network is untied after inverted type current transformer end shield ground wire, with equipment from figure
Into high-voltage capacitor composition depressor；The normal voltage ratio that the present invention is provided is filled using a standard voltage transformer
Put and calibrated, by adjust low-voltage standards condenser network change normal voltage proportioning device partial pressure when phase value reach it is pre-
The class of accuracy first determined.The device is transformed in the low-pressure end of inverted type current transformer, and its insulated part is continued to use
Original equipment insulated part, the running situation of original equipment is not influenceed.
As shown in figure 1, the normal voltage proportioning device in the present embodiment includes inverted type current transformer and low-voltage standards
Condenser network；The secondary side output end connection of low-voltage standards condenser network and inverted type current transformer；Inverted Current Mutual Inductance
The dielectric of device is only gas, it is impossible to using the inverted type current transformer of oil-insulation medium；
Low-voltage standards condenser network includes low-voltage standards capacitor and earthed switch in parallel, and trimmer, electricity
Press follower, first order amplifier and second level amplifier；The low-voltage standards capacitor is the secondary capacitor of standard；
When earthed switch is closed, low-voltage standards capacitor does not work, inverted type current transformer normal work；
When earthed switch disconnects, low-voltage standards capacitor is used as low-voltage arm, the height of inverted type current transformer high-pressure side
Piezoelectric capsule C1 is as high-voltage arm, to build normal voltage proportioning device, inverted type current transformer normal work.
First, as shown in Fig. 2 inverted type current transformer is led including high pressure shell 1, second siding ring screen layer 2, primary side
Electric pole 3 secondary side fairlead 4 and signal box 5.
Primary side conducting rod 3 is bolted to connection with high pressure shell 1, and second siding ring screen layer 2 draws with secondary side
Spool 4 is connected；Second siding ring screen layer 2 is arranged on inside high pressure shell 1；
High pressure shell 1 and the equipotential of primary side conducting rod 3, second siding ring screen layer 2 and the grade of secondary side fairlead 4 electricity
Position；
High-voltage capacitor C1 is the high-voltage capacitance formed between second siding ring screen layer 2 and primary side conducting rod 3.
After the ground wire of the secondary side output end of low-voltage standards condenser network and inverted type current transformer, installed in signal
In box 5.
2nd, as shown in figure 3, low-voltage standards condenser network includes low-voltage standards capacitor C21, earthed switch K, portable protective gaps
G, trimmer C22, voltage follower A1, first order amplifier A2 and second level amplifier A3.
1st, a branch road of the secondary side output end of inverted type current transformer and low-voltage standards capacitor C21 one end connect
Connect, another branch road is connected with voltage follower A1 inverting input；Low-voltage standards capacitor C21 other end ground connection；
①：Voltage follower A1 is connected by resistance R1 with first order amplifier A2 inverting input, its anti-phase input
Adjustable resistance R2 is connected between end and first order amplifier A2 output end.
②：First order amplifier A2 output end is connected by resistance R4 with second level amplifier A3 inverting input,
Resistance R5 is connected between device inverting input and the second level amplifier A3 output end；Resistance R4 and resistance R5 resistance phase
Deng；Second level amplifier A3 output end is the output end of device, outputting standard signal.
First order amplifier A2, second level amplifier A3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and electricity
Hinder R6 composition amplifying circuits.Amplifying circuit selection be using sign-changing amplifier because its can while increase and reduce amplification ratio,
But it is due to that sign-changing amplifier can be by the reverse 180 degree of phase, so second level amplifier A3 is used for phase angle again reverse 180
Degree, therefore resistance R4=R5.First order amplifier A2 uses T-shaped network mode, and degree of regulation is 10-6V。
③：Trimmer C22 is connected in parallel on low-voltage standards capacitor C21 two ends；By changing trimmer C22 electricity
The size of capacitance, the output error of adjustment criteria voltage ratio device so that output error meets preset class of accuracy and missed
The scope of difference limitation.
④：Low-voltage standards capacitor C21 two ends are parallel with portable protective gaps G, when there is overvoltage on high-voltage capacitor C1
When, protect low-voltage standards condenser network.
2nd, the voltage transformer that the present invention is carried calibrates for error included with the operating method of normal voltage proportioning device online：
Step 1：As shown in figure 3, inverted type current transformer high-pressure side and standard potential transformer C21 primary side are connected
Connect, the secondary side high-pressure side of low-voltage standards condenser network and standard mutual inductor is connected；
Step 2：Calculate standard mutual inductor low pressure terminal voltage value U1The magnitude of voltage U2's exported with low-voltage standards condenser network
Difference DELTA U；
Step 3：The intrinsic standoff ratio that the trimmer C22 in low-voltage standards condenser network changes device is adjusted, low pressure is adjusted
Adjustable resistance R2 in standard capacitance circuit, changes the phase angle of low-voltage standards condenser network output voltage so that difference DELTA U expires
The scope of the preset class of accuracy error limitation of foot.
3rd, the course of work of Plays of embodiment of the present invention voltage ratio device is：
When earthed switch K as shown in Figure 3 is closed, standard potential transformer C21 is short-circuited, and inverted type current transformer is just
Often work；When earthed switch K disconnects, standard potential transformer C21 is connected with high-voltage capacitor C1, low-voltage standards condenser network
Second level amplifier A3 output end output signal be the normal voltage proportioning device standard signal, to detect quilt
Survey divider.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained under the premise of creative work is not made
Every other embodiment, belong to the application protection scope.
Claims (5)
1. a kind of voltage transformer calibrates for error online uses normal voltage proportioning device, it is characterised in that described device includes falling
Vertical current transformer and low-voltage standards condenser network；The low-voltage standards condenser network and inverted type current transformer it is secondary
Side output end connection, including low-voltage standards capacitor and earthed switch in parallel；The insulation of the inverted type current transformer is situated between
Matter is gas；
During the earthed switch closure, low-voltage standards capacitor does not work, the inverted type current transformer normal work；
When the earthed switch disconnects, low-voltage standards capacitor is used as low-voltage arm, the high pressure of inverted type current transformer high-pressure side
Capacitor is as high-voltage arm, to build the normal voltage proportioning device, the inverted type current transformer normal work；
The low-voltage standards condenser network also includes trimmer, voltage follower, first order amplifier and second level amplification
Device；
One branch road of the secondary side output end of the inverted type current transformer connects with one end of the low-voltage standards capacitor
Connect, another branch road is connected with the inverting input of the voltage follower；The other end ground connection of the low-voltage standards capacitor；
The voltage follower is connected by resistance R1 with the inverting input of first order amplifier, the first order amplifier
Adjustable resistance R2 is connected between the output end of inverting input and first order amplifier；
The output end of the first order amplifier is connected by resistance R4 with the inverting input of second level amplifier, and described second
Resistance R5 is connected between the level inverting input of amplifier and the output end of second level amplifier；The resistance R4 and resistance R5
Resistance it is equal；
The output end of the second level amplifier is the output end of described device, outputting standard signal；
The two ends of the low-voltage standards capacitor are parallel with portable protective gaps, when there is overvoltage on the high-voltage capacitor, protect
Protect the low-voltage standards condenser network.
2. device as claimed in claim 1, it is characterised in that the inverted type current transformer includes high pressure shell, secondary
Lateral coil screen layer, primary side conducting rod and secondary side fairlead；The primary side conducting rod is solid by bolt with high pressure shell
Fixed connection, the second siding ring screen layer is connected with secondary side fairlead；Second siding ring screen layer is arranged on high pressure shell
It is internal；
The high pressure shell and primary side conducting rod equipotential, the electricity such as the second siding ring screen layer and secondary side fairlead
Position；
The high-voltage capacitor is the high-voltage capacitance formed between the second siding ring screen layer and the primary side conducting rod.
3. device as claimed in claim 1, it is characterised in that the trimmer is connected in parallel on the low-voltage standards capacitor
Two ends；By changing the size of trimmer capacitance, the output error of the normal voltage proportioning device is adjusted so that
The output error meets the scope of preset class of accuracy error limitation.
4. device as claimed in claim 1, it is characterised in that the degree of regulation of the first order amplifier is 10-6V.
5. such as the operating method of any one of claim 1-4 described device, it is characterised in that methods described includes：
Step 1：The primary side of inverted type current transformer high-pressure side and standard potential transformer is connected, by low-voltage standards electric capacity
The secondary side high-pressure side connection of circuit and standard mutual inductor；
Step 2：Calculate the magnitude of voltage that the standard mutual inductor low pressure terminal voltage value U1 is exported with the low-voltage standards condenser network
U2 difference U；
Step 3：The intrinsic standoff ratio that the trimmer in the low-voltage standards condenser network changes described device is adjusted, low pressure is adjusted
Adjustable resistance R2 in standard capacitance circuit, changes the phase angle of low-voltage standards condenser network output voltage so that difference U is met
The scope of preset class of accuracy error limitation.
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| CN105225816A (en) * | 2015-10-21 | 2016-01-06 | 中国电力科学研究院 | A kind of current transformer with high voltage standard capacitor function |
| CN109038610A (en) * | 2018-08-22 | 2018-12-18 | 爱启（厦门）电气技术有限公司 | Tunable capacitor sensor with miniature multipath switch on-off |
| CN109239639B (en) * | 2018-11-14 | 2023-09-12 | 国家电网有限公司 | High-accuracy 600kV broadband standard voltage divider and application method thereof |
| CN115792343B (en) * | 2023-01-30 | 2023-05-09 | 北京昊创瑞通电气设备股份有限公司 | Accuracy-adjustable voltage sensor and accuracy adjustment method thereof |
| CN117250394B (en) * | 2023-09-22 | 2024-06-18 | 江苏靖江互感器股份有限公司 | Anti-interference integrated sensor and manufacturing method thereof |
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| CN204116591U (en) * | 2014-11-14 | 2015-01-21 | 国家电网公司 | Voltage transformer (VT) calibrates for error online and uses normal voltage proportioning device |
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| CN2248380Y (en) * | 1995-10-06 | 1997-02-26 | 西安电力电容器厂 | Current mutual inductor with function of on-line detection |
| US6414579B1 (en) * | 1999-12-06 | 2002-07-02 | General Electric Company | Current transformer and method for correcting asymmetries therein |
| CN201697961U (en) * | 2010-06-25 | 2011-01-05 | 国网电力科学研究院 | System for measuring transient over-voltage of high-voltage power grid by adopting distributed capacitance method |
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