CN104330761A - Standard voltage ratio device for online error correction for voltage transformer and operation method - Google Patents
Standard voltage ratio device for online error correction for voltage transformer and operation method Download PDFInfo
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- CN104330761A CN104330761A CN201410646288.XA CN201410646288A CN104330761A CN 104330761 A CN104330761 A CN 104330761A CN 201410646288 A CN201410646288 A CN 201410646288A CN 104330761 A CN104330761 A CN 104330761A
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Abstract
The invention provides a standard voltage ratio device for online error correction for a voltage transformer and an operation method. The device comprises an inverted current transformer, a low-voltage standard capacitance circuit and a low-voltage standard capacitor and an earthing switch which are connected in parallel. The low-voltage standard capacitance circuit is connected with a secondary-side output end of the inverted current transformer. When the earthing switch is closed, the low-voltage standard capacitor does not work, and the inverted current transformer works. When the earthing switch is disconnected, the low-voltage standard capacitor serves as the low-voltage arm, and a high-pressure capacitor at the high-pressure end of the inverted current transformer serves as the high-pressure arm to form the standard voltage ratio device, and the inverted current transformer works normally. According to the standard voltage ratio device, compared with the prior art, error correction can be performed on the voltage transformer in the electrification state by the aid of the inverted current transformer.
Description
Technical field
The present invention relates to a kind of normal voltage proportioning device, be specifically related to a kind of voltage transformer (VT) and calibrate for error online by normal voltage proportioning device and method of operating.
Background technology
In recent years, voltage class of electric power system improves constantly, and generated energy, power consumption increase severely, and simultaneously along with the separation that power system reform particularly generates electricity, transmits electricity, the accuracy of electric energy metrical and fairness cause showing great attention to of society.Voltage transformer (VT) is as the important component part of Electric Energy Tariff Point Metering Device, for ensureing that it reliably puts into operation, according to " Erection works of electrical installations Standard for handover test of electric equipment ", need after voltage transformer (VT) installs at the scene to carry out commissioning test, wherein site error commissioning test is very important ingredient in commissioning test.In Practical Project, standard set-up is normally transported to scene by the error measure of voltage transformer (VT), calibrates for error, say the commissioning test really not carrying out error measure from the strict sense under off-line state to the voltage transformer (VT) before installation.In addition, according to vertification regulation, regularly must carry out error characteristics detection in electrical network for the mutual inductor of energy metering, but find in reality detects, the mutual inductor used in some circuits cannot have a power failure detections at all, otherwise can affect the normal life production of people; Although some circuits can have a power failure, mutual inductor off-line error-detecting workload is large, the cycle is long.
Electric system primary equipment repair based on condition of component is the inexorable trend of power network development, is also the means reducing operating cost, reduce equipment breakdown probability.Due to voltage transformer (VT) substantial amounts in electric system, it is huge that off-line carries out error characteristics testing amount, wastes time and energy, and can not obtain the True Data under three-phase electriferous state.Therefore, need to provide a kind of voltage transformer (VT) to calibrate for error online and use normal voltage proportioning device, carry out voltage transformer (VT) scene band electric calibration to overcome the shortcoming of above-mentioned off-line calibration, improve error characteristics of voltage transformer uncertainty of measurement level, for the integrated on-line calibration realizing electric power meter is taken a firm foundation, improve the accuracy of electric energy metrical.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of voltage transformer (VT) and calibrate for error online and use normal voltage proportioning device, described device comprises inverted type current transformer and low-voltage standards condenser network; Described low-voltage standards condenser network is connected with the secondary side output terminal of inverted type current transformer, comprises low-voltage standards capacitor in parallel and grounding switch; The insulating medium of described inverted type current transformer is gas;
When described grounding switch closes, low-voltage standards capacitor does not work, and described inverted type current transformer normally works;
When described grounding 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, and to build described normal voltage proportioning device, described inverted type current transformer normally works.
Preferably, described inverted type current transformer comprises high pressure shell, second siding ring screen layer, primary side conducting rod and secondary side fairlead; Described primary side conducting rod and high pressure shell are bolted to connection, and described second siding ring screen layer is connected with secondary side fairlead; Second siding ring screen layer is arranged on high pressure enclosure;
Described high pressure shell and primary side conducting rod equipotential, described second siding ring screen layer and secondary side fairlead equipotential;
Described high-voltage capacitor is the high-voltage capacitance formed between described second siding ring screen layer and described primary side conducting rod;
Preferably, described low-voltage standards condenser network also comprises vernier capacitor, voltage follower, first order amplifier and second level amplifier;
A branch road of the secondary side output terminal of described inverted type current transformer is connected with one end of described low-voltage standards capacitor, and another branch road is connected with the inverting input of described voltage follower; The other end ground connection of described low-voltage standards capacitor;
Described voltage follower is connected with the inverting input of first order amplifier by resistance R1, is connected with adjustable resistance R2 between the output terminal of described inverting input and first order amplifier;
Described output terminal is connected with the inverting input of second level amplifier by resistance R4, is connected with resistance R5 between the output terminal of described inverting input and second level amplifier; The resistance of described resistance R4 and resistance R5 is equal;
The output terminal of described second level amplifier is the output terminal of described device, outputting standard signal;
Preferably, described vernier capacitor is connected in parallel on the two ends of described low-voltage standards capacitor; By changing the size of vernier capacitor capacitance, regulating the output error of described normal voltage proportioning device, making described output error meet the scope of preset class of accuracy error limitation;
Preferably, the degree of regulation of described first order amplifier is 10
-6v;
Preferably, the two ends of described low-voltage standards capacitor are parallel with portable protective gaps, when described high-voltage capacitor exists superpotential, protect described low-voltage standards condenser network;
The invention provides a kind of voltage transformer (VT) to calibrate for error online by normal voltage proportioning device method of operating, described method comprises:
Step 1: be connected with the primary side of standard potential transformer by inverted type current transformer high-pressure side, is connected low-voltage standards condenser network with the secondary side high-pressure side of standard mutual inductor;
Step 2: calculate described standard mutual inductor low pressure end magnitude of voltage U
1the magnitude of voltage U exported with described low-voltage standards condenser network
2difference DELTA U;
Step 3: the vernier capacitor adjusted in described low-voltage standards condenser network changes the intrinsic standoff ratio of described device, adjustable resistance R2 in adjustment low-voltage standards condenser network, change the phasing degree of low-voltage standards condenser network output voltage, make difference DELTA U meet the scope of preset class of accuracy error limitation.
Compared with immediate prior art, excellent effect of the present invention is:
1, a kind of voltage transformer (VT) provided by the invention calibrates for error online and uses normal voltage proportioning device, be in the coil shielding of electronegative potential by means of inverted type current transformer and be in the distributed capacitor formed between the tank body of noble potential, form the high-voltage arm of capacitive divider, coil bonding termination enters the low-voltage arm capacitor of capacitive divider, can calibrate for error to voltage transformer (VT) in the energized state.
2, a kind of voltage transformer (VT) provided by the invention calibrates for error online and uses normal voltage proportioning device, under inverted type current transformer short time off-line state, in parallel with the standard potential transformer of identical electric pressure, the ratio of standard potential transformer is passed to this normal voltage proportioning device, in stipulated time, normal voltage proportioning device is dropped into electrical network, for verifying the error characteristics of each voltage transformer (VT) of homophase online.
3, a kind of voltage transformer (VT) provided by the invention calibrates for error online and uses normal voltage proportioning device, by means of the high pressure bearing object of the current transformer composition normal voltage proportioning device of operation of power networks, evade the insulation risk with conventional criteria voltage ratio device access electrical network.
4, a kind of voltage transformer (VT) provided by the invention calibrates for error online and uses normal voltage proportioning device, complete after in-phase voltage transformer error characteristic verifies online, the earth terminal normal ground work of inverted type current transformer, does not affect inverted type current transformer duty.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: in the embodiment of the present invention, a kind of voltage transformer (VT) calibrates for error with normal voltage proportioning device structural representation online;
The structural drawing of inverted type current transformer in Fig. 2: Fig. 1;
Fig. 3: Fig. 1 mesolow standard capacitance circuit diagram;
Fig. 4: in the embodiment of the present invention, a kind of voltage transformer (VT) calibrates for error with the wiring diagram that calibrates for error of normal voltage proportioning device online;
Wherein, 1-high pressure shell; 2-second siding ring screen layer; 3-primary side conducting rod; 4-secondary side fairlead; 5-signal shell.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
A kind of voltage transformer (VT) based on inverted type current transformer provided by the invention calibrates for error online and uses normal voltage proportioning device, low-voltage standards condenser network is accessed, the high-voltage capacitor composition depressor formed with equipment self after untiing inverted type current transformer end shield ground wire; Adopt a standard potential transformer to calibrate normal voltage proportioning device provided by the invention, the dividing potential drop changing normal voltage proportioning device by adjustment low-voltage standards condenser network when phase value reaches the class of accuracy measured in advance.This device transforms at the low pressure end of inverted type current transformer, and its insulated part continues to use original equipment insulated part, does not affect the ruuning situation of original equipment.
As shown in Figure 1, the normal voltage proportioning device in the present embodiment comprises inverted type current transformer and low-voltage standards condenser network; Low-voltage standards condenser network is connected with the secondary side output terminal of inverted type current transformer; The insulating medium of inverted type current transformer is only gas, can not adopt the inverted type current transformer of oil-insulation medium;
Low-voltage standards condenser network comprises low-voltage standards capacitor in parallel and grounding switch, and vernier capacitor, voltage follower, first order amplifier and second level amplifier; Described low-voltage standards capacitor is the secondary capacitor of standard;
When grounding switch closes, low-voltage standards capacitor does not work, and inverted type current transformer normally works;
When grounding switch disconnects, low-voltage standards capacitor is as low-voltage arm, and the high-voltage capacitor C1 of inverted type current transformer high-pressure side is as high-voltage arm, and to build normal voltage proportioning device, inverted type current transformer normally works.
One, as shown in Figure 2, inverted type current transformer comprise high pressure shell 1, second siding ring screen layer 2, primary side conducting rod 3 secondary side fairlead 4 and signal box 5.
Primary side conducting rod 3 and high pressure shell 1 are bolted to connection, and second siding ring screen layer 2 is connected with secondary side fairlead 4; It is inner that second siding ring screen layer 2 is arranged on high pressure shell 1;
High pressure shell 1 and primary side conducting rod 3 equipotential, second siding ring screen layer 2 and secondary side fairlead 4 equipotential;
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 terminal of low-voltage standards condenser network and inverted type current transformer, be arranged in signal box 5.
Two, as shown in Figure 3, low-voltage standards condenser network comprises low-voltage standards capacitor C21, grounding switch K, portable protective gaps G, vernier capacitor C22, voltage follower A1, first order amplifier A2 and second level amplifier A3.
1, a branch road of the secondary side output terminal of inverted type current transformer is connected with one end of low-voltage standards capacitor C21, and another branch road is connected with the inverting input of voltage follower A1; The other end ground connection of low-voltage standards capacitor C21;
1.: voltage follower A1 is connected with the inverting input of first order amplifier A2 by resistance R1, is connected with adjustable resistance R2 between the output terminal of its inverting input and first order amplifier A2.
2.: the output terminal of first order amplifier A2 is connected with the inverting input of second level amplifier A3 by resistance R4, is connected with resistance R5 between the output terminal of device inverting input and second level amplifier A3; The resistance of resistance R4 and resistance R5 is equal; The output terminal of second level amplifier A3 is the output terminal of device, outputting standard signal.
First order amplifier A2, second level amplifier A3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and resistance R6 form amplifying circuit.Amplifying circuit is selected to adopt sign-changing amplifier to be because it can increase and reduce amplification ratio simultaneously, but due to sign-changing amplifier can by reverse for phase place 180 degree, so second level amplifier A3 is for by reverse 180 degree again, phasing degree, therefore resistance R4=R5.First order amplifier A2 adopts T-shaped network mode, and degree of regulation is 10
-6v.
3.: vernier capacitor C22 is connected in parallel on the two ends of low-voltage standards capacitor C21; By changing the size of vernier capacitor C22 capacitance, the output error of adjustment criteria voltage ratio device, makes output error meet the scope of preset class of accuracy error limitation.
4.: the two ends of low-voltage standards capacitor C21 are parallel with portable protective gaps G, when there is superpotential in high-voltage capacitor C1, protection low-voltage standards condenser network.
2, the voltage transformer (VT) that the present invention carries calibrates for error online and to comprise by the method for operating of normal voltage proportioning device:
Step 1: as shown in Figure 3, is connected the primary side of inverted type current transformer high-pressure side with standard potential transformer C21, is connected by low-voltage standards condenser network with the secondary side high-pressure side of standard mutual inductor;
Step 2: calculate standard mutual inductor low pressure end magnitude of voltage U
1the difference DELTA U of the magnitude of voltage U2 exported with low-voltage standards condenser network;
Step 3: the intrinsic standoff ratio of the vernier capacitor C22 modifier in adjustment low-voltage standards condenser network, adjustable resistance R2 in adjustment low-voltage standards condenser network, change the phasing degree of low-voltage standards condenser network output voltage, make difference DELTA U meet the scope of preset class of accuracy error limitation.
Three, the course of work of embodiment of the present invention Plays voltage ratio device is:
When grounding switch K as shown in Figure 3 closes, standard potential transformer C21 is shorted, and inverted type current transformer normally works; When grounding switch K disconnects, standard potential transformer C21 is connected with high-voltage capacitor C1, and the signal of the output terminal output of the second level amplifier A3 of low-voltage standards condenser network is the standard signal of described normal voltage proportioning device, to detect tested voltage divider.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (7)
1. voltage transformer (VT) calibrates for error online and uses a normal voltage proportioning device, it is characterized in that, described device comprises inverted type current transformer and low-voltage standards condenser network; Described low-voltage standards condenser network is connected with the secondary side output terminal of inverted type current transformer, comprises low-voltage standards capacitor in parallel and grounding switch; The insulating medium of described inverted type current transformer is gas;
When described grounding switch closes, low-voltage standards capacitor does not work, and described inverted type current transformer normally works;
When described grounding 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, and to build described normal voltage proportioning device, described inverted type current transformer normally works.
2. device as claimed in claim 1, it is characterized in that, described inverted type current transformer comprises high pressure shell, second siding ring screen layer, primary side conducting rod and secondary side fairlead; Described primary side conducting rod and high pressure shell are bolted to connection, and described second siding ring screen layer is connected with secondary side fairlead; Second siding ring screen layer is arranged on high pressure enclosure;
Described high pressure shell and primary side conducting rod equipotential, described second siding ring screen layer and secondary side fairlead equipotential;
Described high-voltage capacitor is the high-voltage capacitance formed between described second siding ring screen layer and described primary side conducting rod.
3. device as claimed in claim 1, it is characterized in that, described low-voltage standards condenser network also comprises vernier capacitor, voltage follower, first order amplifier and second level amplifier;
A branch road of the secondary side output terminal of described inverted type current transformer is connected with one end of described low-voltage standards capacitor, and another branch road is connected with the inverting input of described voltage follower; The other end ground connection of described low-voltage standards capacitor;
Described voltage follower is connected with the inverting input of first order amplifier by resistance R1, is connected with adjustable resistance R2 between the output terminal of described inverting input and first order amplifier;
Described output terminal is connected with the inverting input of second level amplifier by resistance R4, is connected with resistance R5 between the output terminal of described inverting input and second level amplifier; The resistance of described resistance R4 and resistance R5 is equal;
The output terminal of described second level amplifier is the output terminal of described device, outputting standard signal.
4. device as claimed in claim 3, it is characterized in that, described vernier capacitor is connected in parallel on the two ends of described low-voltage standards capacitor; By changing the size of vernier capacitor capacitance, regulating the output error of described normal voltage proportioning device, making described output error meet the scope of preset class of accuracy error limitation.
5. device as claimed in claim 1, it is characterized in that, the degree of regulation of described first order amplifier is 10
-6v.
6. device as claimed in claim 1, it is characterized in that, the two ends of described low-voltage standards capacitor are parallel with portable protective gaps, when described high-voltage capacitor exists superpotential, protect described low-voltage standards condenser network.
7. the method for operating of device as described in any one of claim 1-6, it is characterized in that, described method comprises:
Step 1: be connected with the primary side of standard potential transformer by inverted type current transformer high-pressure side, is connected low-voltage standards condenser network with the secondary side high-pressure side of standard mutual inductor;
Step 2: calculate described standard mutual inductor low pressure end magnitude of voltage U
1the magnitude of voltage U exported with described low-voltage standards condenser network
2difference DELTA U;
Step 3: the vernier capacitor adjusted in described low-voltage standards condenser network changes the intrinsic standoff ratio of described device, adjustable resistance R2 in adjustment low-voltage standards condenser network, change the phasing degree of low-voltage standards condenser network output voltage, make difference DELTA U meet the scope of preset class of accuracy error limitation.
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| CN201410646288.XA CN104330761B (en) | 2014-11-14 | 2014-11-14 | Voltage transformer calibrates for error with normal voltage proportioning device and operating method online |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN109239639A (en) * | 2018-11-14 | 2019-01-18 | 国家电网有限公司 | A kind of the 600kV wideband standard voltage divider and its application method of high accuracy |
| CN115792343A (en) * | 2023-01-30 | 2023-03-14 | 北京昊创瑞通电气设备股份有限公司 | Voltage sensor with adjustable accuracy and accuracy adjusting method thereof |
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Cited By (5)
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| 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 |
| CN115792343A (en) * | 2023-01-30 | 2023-03-14 | 北京昊创瑞通电气设备股份有限公司 | Voltage sensor with adjustable accuracy and accuracy adjusting method thereof |
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Effective date of registration: 20160617 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China Electric Power Research Institute Applicant after: STATE GRID HUBEI ELECTRIC POWER COMPANY Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: China Electric Power Research Institute |
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