CN113759159B - Capacitive voltage transformer with function of outputting capacitive current signals - Google Patents
Capacitive voltage transformer with function of outputting capacitive current signals Download PDFInfo
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- 238000012806 monitoring device Methods 0.000 claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 61
- 238000004804 winding Methods 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 11
- 238000013016 damping Methods 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
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- 238000012937 correction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0416—Connectors, terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
- G01R15/06—Voltage dividers having reactive components, e.g. capacitive transformer
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Abstract
The invention discloses a capacitive voltage transformer with a capacitive current output function, which mainly comprises a capacitive voltage divider, an electromagnetic unit, a secondary junction box, a built-in current sensor, a carrier accessory, an anti-interference transmission line and a monitoring device, wherein the capacitive voltage divider is arranged on the capacitive voltage divider; the connecting structure is as follows: the low-voltage terminal and the carrier terminal of the capacitive voltage transformer are connected with the corresponding terminals of the electromagnetic unit; the output terminal of the electromagnetic unit is led out from the secondary junction box; the input terminals of the built-in current sensor are three output terminals in the secondary junction box; the carrier accessory is connected in series between the low-voltage end and the grounding end of the capacitive voltage divider; the anti-interference transmission line is connected with four output terminals of the built-in current sensor and a current acquisition input port of the monitoring device, and sends capacitance current signals into the monitoring device. The invention mainly solves the problems that various methods for measuring harmonic voltage by using CVT cannot measure offline, has high running cost, ignores electromagnetic units and equivalent resistance effects and the like.
Description
Technical Field
The invention belongs to the field of transformers, and particularly relates to a capacitive voltage transformer with a capacitive current output function.
Background
Currently, in a high-voltage class power grid of 110kV and above, the number of Capacitive Voltage Transformers (CVT) and electromagnetic voltage transformers (IVT) used for a national network harmonic monitoring analysis module is 2710 and 1155 respectively, so that the CVT takes an absolute position in the aspect of providing data sources for monitoring the power quality. Therefore, how to accurately measure harmonic waves by using the CVT becomes a key problem in the field of power quality measurement, and achieves the aim of high-quality, low-cost and high-efficiency online operation, so that the operation condition of the CVT can be monitored.
In view of the above problems, three solutions are currently in common use: a frequency characteristic correction method, a new C3 method, and a capacitive current method. The frequency characteristic correction method is to correct the secondary voltage according to the frequency characteristic curve, and the method can obtain more accurate primary side voltage, but has the defects that the method can not realize on-line monitoring, is influenced by the type of the CVT, has large experimental data volume and long experimental period; the newly added C3 capacitance method is to add a capacitor C3 at a low-voltage terminal of a capacitive voltage divider, obtain voltages at two ends of the capacitor C3 according to a voltage division principle, and deduce and obtain primary side voltage; the capacitive current method is to calculate the voltage by adopting the capacitive current flowing through the capacitive voltage divider and combining the capacitance value of the capacitor, the method does not need to modify the internal structure of the CVT, and can carry out network-hanging on-line monitoring, but in the current voltage calculation method, the capacitor is regarded as an ideal capacitor, the capacitor in the capacitive voltage divider does not meet the ideal capacitor condition in actual operation, and an actual model is in a serial-parallel mode of the capacitor and the resistor, so that the influence of the equivalent resistance of the capacitor needs to be considered, a real-time reliable capacitive current signal needs to be obtained, and more accurate primary side voltage can be calculated by analyzing the capacitive current signal.
In summary, the capacitive current method commonly used at present has the problem of neglecting the equivalent resistance of the capacitor, and the key to solve the problem is how to obtain a real-time reliable capacitive current signal, and by analyzing the capacitive current signal, a calculation formula can be corrected to obtain more accurate primary side voltage.
Disclosure of Invention
The invention mainly solves the problems that various methods for measuring harmonic voltage by using CVT at present can not realize off-line measurement, has high running cost, ignores the influence of an electromagnetic unit and equivalent resistance, and measures accurate capacitance current signals.
In order to achieve the above objective, the capacitive voltage transformer with a capacitive current output function according to the present invention includes a capacitive voltage divider, an electromagnetic unit, a secondary junction box and a built-in current sensor, wherein the built-in current sensor is disposed in the secondary junction box, the capacitive voltage divider includes a high-voltage capacitor C1 and a low-voltage capacitor C2 that are electrically connected, one end of the connection between the low-voltage capacitor C2 and the high-voltage capacitor C1 is a low-voltage terminal a ', the other end is connected to a carrier communication terminal N, the low-voltage terminal a ' is led to the secondary junction box and is connected to the terminal a ' of the electromagnetic unit, the low-voltage terminal XL, the carrier communication terminal N and a ground terminal of the electromagnetic unit are respectively connected to a terminal X, a terminal NI and a terminal G of an input port of the built-in current sensor, a primary input port NI-X formed by the terminal NI and the terminal X corresponds to secondary output ports P3-P4, and a primary input port X-G formed by the primary terminal X and the terminal G corresponds to secondary output ports P1-P2.
Further, a carrier accessory is arranged in the secondary junction box.
Further, the output port of the built-in current sensor is connected with a monitoring device through a transmission line, and the monitoring device is used for receiving a current signal output by the output port of the built-in current sensor and calculating the total voltage of the primary side of the CVT and the low-voltage capacitor current according to the received current signal.
Further, the transmission line is an anti-interference transmission line.
Further, the medium of the high-voltage capacitor C1 and the high-voltage capacitor C2 is a composite material of a polypropylene film and capacitor paper.
Further, the electromagnetic unit comprises a medium-voltage transformer T, a compensating reactor L, a protection device P and a damping device D, wherein the compensating reactor L is connected with the protection device P in parallel and is connected with a primary side winding of the intermediate transformer T in series, the damping device D is connected in parallel in a secondary winding of the intermediate transformer T, and the medium-voltage transformer T adopts an outer yoke inner iron type three-column iron core.
Further, the compensation reactor L employs a C-shaped iron core.
Further, the two ends of the compensating reactor L are respectively provided with a zinc oxide valve plate lightning arrester of a protection device.
Further, the damping device D is a fast saturation type damper.
Furthermore, the built-in current sensor adopts a through-type structure.
Compared with the prior art, the invention has at least the following beneficial technical effects:
(1) The wiring terminal of the CVT secondary junction box is replaced by the input terminal of the built-in current sensor, capacitance current signals are conveniently obtained on the basis of not modifying the structure of the CVT, modification cost is saved, online collection and processing of the CVT capacitance current signals are realized, the current sensor is directly installed at the terminal of the CVT secondary junction box, the influence of electromagnetic interference is avoided, the operation environment is stable, errors generated in the collection process are reduced, and the CVT secondary junction box is suitable for on-site operation and measurement.
(2) The influence of the capacitance equivalent resistance in actual operation is considered, the dielectric loss angle of the corresponding capacitor is obtained by analyzing the collected current signal, the resistance value of the capacitance equivalent resistance is further calculated, the calculation formula of the capacitance current method for restoring the primary side voltage is corrected, and the calculated primary side voltage is more accurate.
(3) According to the micro-current sensor capable of being arranged in the secondary junction box, the output terminal of the CVT can be directly in butt joint with the input port of the micro-current sensor, so that the CVT has capacitance current signal output capability, and the CVT is conveyed through the anti-interference transmission line, so that the influence of electromagnetic interference can be avoided, the operation state of a capacitor unit can be monitored by the obtained accurate capacitance current signal, and the primary side reduction voltage result can be corrected.
Furthermore, the built-in current sensor adopts a through structure, the structure can not change the original wiring mode of the tested equipment, the safety is higher in measurement, and the anti-interference capability is strong.
Drawings
FIG. 1 is a schematic diagram of the operation of a capacitive voltage transformer with capacitive current output function of the present invention;
FIG. 2 is a schematic diagram of a capacitive voltage transformer with capacitive current output according to the present invention;
FIG. 3 is a structural wiring diagram within the secondary junction box of the present invention;
fig. 4 is a schematic diagram of a built-in current sensor according to the present invention.
In the accompanying drawings: 1-a capacitive voltage divider; 2-an electromagnetic unit; 3-secondary junction box; 4-built-in current sensor; 5-carrier attachment; 6-an anti-interference transmission line; 7-monitoring device.
Detailed Description
In order to make the purpose and technical scheme of the invention clearer and easier to understand. The present invention will now be described in further detail with reference to the drawings and examples, which are given for the purpose of illustration only and are not intended to limit the invention thereto.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The specific connection mode of each part in the invention is as follows: referring to fig. 1 and 2, a capacitive voltage transformer with a capacitive current output function is composed of a capacitive voltage divider 1, an electromagnetic unit 2, a secondary junction box 3, a built-in current sensor 4, a carrier accessory 5, an anti-interference transmission line 6 and a monitoring device 7.
The connecting structure is as follows: the high-voltage terminal A of the capacitive voltage divider 1 is connected with a power grid, and the low-voltage terminal A 'and the carrier terminal N of the capacitive voltage divider 1 are led out into the electromagnetic unit 2 by a small porcelain bushing on the bottom cover of the capacitive voltage divider 1 to be connected with the corresponding terminals A' and N; the medium voltage terminal of the electromagnetic unit 2 is the same terminal as the low voltage terminal A' of the capacitive voltage divider 1, which is lowThe pressure terminal XL is led out from the secondary junction box 3; the low-voltage terminal XL, the carrier communication terminal N and the grounding end of the three output terminal electromagnetic units 2 of the secondary junction box 3 are respectively butted with the input ports X, NI and G of the built-in current sensor 4; the carrier accessory 5 comprises a drain coil and a voltage limiting device which are connected in series between the low-voltage terminal A' of the capacitive voltage divider 1 and the ground end and are used for injecting carrier signals, so that CVT signal output is more stable; the anti-interference transmission line 6 is connected with four output terminals P1, P2, P3 and P4 of the built-in current sensor 4 and outputs a measured current signal i flowing through the high-voltage capacitor C1 C1 (t) and the current i flowing through the electromagnetic unit 2 e (t); the anti-interference transmission line 6 is connected with a current acquisition input port of the monitoring device 7, and sends a current signal into the monitoring device 7.
The capacitive voltage transformer comprises a capacitive voltage divider 1, an electromagnetic unit 2 and a secondary junction box 3, wherein a built-in current sensor 4 and a carrier accessory 5 are arranged in the secondary junction box 3, and an output pin of the built-in current sensor 4 is connected with a monitoring device 7 through an anti-interference transmission line 6. The capacitive voltage divider 1 is formed by connecting one or more power-saving capacitors in series and is divided into a high-voltage capacitor C1 and a low-voltage capacitor C2, a medium of the capacitor is compounded and impregnated with capacitor paper by adopting a polypropylene film, a high-voltage terminal A is arranged at the top end of the capacitive voltage divider 1, and the high-voltage terminal A of the capacitive voltage divider 1 is connected with a power grid, so that the capacitive voltage transformer is connected into the power grid. The low-voltage terminal A 'of the capacitive voltage transformer is led out from a small porcelain bushing on the bottom cover of the capacitive voltage divider 1 into the electromagnetic unit 2 to be connected with the corresponding A', and the grounding terminal is led out from the secondary junction box 3.
The electromagnetic unit 2 is composed of a medium-voltage transformer T, a compensating reactor L, a protection device P, a damping device D for inhibiting ferromagnetic resonance and an oil tank. The compensating reactor L is connected in parallel with the protection device P and is connected in series with the primary side winding of the intermediate transformer T, the damping device D is connected in parallel in the secondary winding of the intermediate transformer T, and the secondary winding of the intermediate transformer T is provided with four windings which are respectively 1a1n, 2a2n, 3a3n and dadn. Terminals 1a, 1n, 2a, 2n, 3a, 3n, da, dn are led out of secondary junction box 3.
The medium voltage transformer, the compensating reactor and the damping device are all arranged in an oil tank, the medium voltage transformer adopts an outer yoke inner iron type three-column iron core, the iron core adopts high-quality cold-rolled silicon steel sheets, and the winding arrangement sequence is a core column, an auxiliary winding, a secondary winding and a high-voltage winding; the compensating reactor is connected in series with the grounding end of the primary winding of the intermediate transformer, a C-shaped iron core is adopted, the inductance value of the compensating reactor is designed to be equal to the capacitance value of the high-voltage capacitor C1 and the high-voltage capacitor C2 in the capacitive voltage divider 1 which are connected in parallel, and a zinc oxide valve plate lightning arrester is arranged at two ends of the compensating reactor; the damping device is a fast saturation type damper, and is connected to the residual voltage winding of the intermediate transformer by using a permalloy iron core.
The medium-voltage terminal of the electromagnetic unit 2 is the same as the low-voltage terminal A 'of the capacitive voltage divider, and the current flowing through the high-voltage capacitor C1 flows into the electromagnetic unit 2 from the low-voltage terminal A' of the capacitive voltage divider 1, and the medium-voltage terminal and the low-voltage terminal share the carrier communication terminal N; the secondary winding terminal and the carrier communication terminal of the electromagnetic unit 2 are led out from a secondary junction box 3 on the front surface of the oil tank; the secondary junction box 3 contains a secondary winding wiring terminal, a connecting wire, a grounding bolt, a cable inlet and a built-in micro-current transformer 4 of the electromagnetic unit 2, and can collect the flowing low-voltage capacitance current i between three output terminals XL, N and a grounding end of the secondary junction box 3 C2 (t) electromagnetic unit current i e (t) wherein the capacitance current i is low C2 (t) and solenoid current i e (t) is collected by the built-in current sensor 4 and is sent to the monitoring device 7.
Referring to fig. 4, the built-in current sensor 4 adopts a through-type structure, and the structure can not change the original wiring mode of the tested equipment, and has higher safety in measurement and strong anti-interference capability. The sensor utilizes the principle of a traditional ferromagnetic current transformer and comprises a primary side and two secondary sides, wherein the input ports of the primary side are X, NI and G, and the output ports of the secondary sides are P1, P2, P3 and P4. The primary side input port NI-X corresponds to the secondary side output ports P3-P4 and the primary side input port X-G corresponds to the secondary side output ports P1-P2.
The primary side of the CVT is provided with 3 input ports, namely NI, X and G, which are respectively connected with a carrier communication terminal N, an electromagnetic unit low-voltage end XL and a grounding end in the CVT secondary junction box 3; the function is to sense the current of the capacitor voltage transformer in real time, the secondary side of the capacitor voltage transformer is provided with 4 output pins which are P1, P2 and P3 respectively,P4, wherein the current flowing through the input port X-G is the electromagnetic unit current i e (t) the corresponding secondary side output pins are P1-P2; the current flowing through the input port NI-X in the primary side is high voltage power Rong Dianliu i C1 (t) the corresponding secondary output pins are P3-P4.
Under normal conditions, the currents of a high-voltage capacitor C1 and a high-voltage capacitor C2 in a 35 kV-750 kV CVT are in the range of 60 mA-700 mA, and a small signal used for measurement in engineering is 1mA, so that the primary side current of the micro-current sensor is transmitted to the secondary side according to a transformation ratio of 1000:1, and the measuring range is 0-1A. The built-in current sensor 4 has smaller overall size, and the appearance size is only 64mm multiplied by 58mm multiplied by 35mm (width multiplied by height multiplied by depth), so that the built-in current sensor can be completely built in a CVT secondary terminal box to replace a connecting line between original CVT secondary terminals, thereby realizing the function of interconnecting the CVT secondary terminals and realizing the function of current measurement;
the carrier accessory 5 comprises a drain coil and a voltage limiting device connected between the low voltage terminal and the ground terminal of the voltage divider 1.
The anti-interference transmission line 6 is connected with an output port of the built-in current sensor 4 and an input port of the monitoring device 7, and transmits a current signal into the monitoring device 7 for processing.
The monitoring device 7 comprises a current acquisition module, a data processing module and a monitoring module, wherein the current acquisition module is connected with the data processing module, the current acquisition module receives a current signal transmitted by the anti-interference transmission line 6, the data processing module analyzes and calculates the current signal to obtain the dielectric loss angle of the capacitor in the capacitive voltage divider, calculates the capacitance series equivalent resistance, corrects the primary side voltage reduction formula, and is connected with the current acquisition module and the data processing module to monitor the data. The corrected results are shown in the formulas (1) - (4):
i C2 (t)＝i C1 (t)-i e (t) (2)
u 1 (t)＝u C1 (t)+u C2 (t) (4)
wherein i is C2 (t) is the capacitance current flowing through the low-voltage capacitor C2, i C1 (t) is the capacitance current flowing through the high voltage capacitor C1, i e (t) is the current flowing through the electromagnetic unit, u C2 (t) is the voltage across the capacitor, u C1 (t) is the voltage at both sides of the high voltage capacitor, u 1 (t) is CVT primary side Total Voltage, R C1 Is the equivalent resistance of the high-voltage capacitor, R C2 Equivalent resistance delta as low-voltage capacitance C1 Dielectric loss angle delta of high-voltage capacitor C1 C2 The dielectric loss angle of the low-voltage capacitor is f, and the measurement frequency is f.
Principle of operation analysis
The invention is composed of a capacitive voltage divider 1, an electromagnetic unit 2, a secondary junction box 3, a built-in micro-current transformer 4, a carrier accessory 5, an anti-interference transmission line 6 and a monitoring device 7. The high-voltage terminal A of the capacitive voltage divider 1 is connected with a power grid, so that the transformer is connected to the power grid, harmonic current in the power grid flows through the high-voltage capacitor C1 in the capacitive voltage divider 1, and the current of the high-voltage capacitor C1 flows into the electromagnetic unit 2 through the low-voltage terminal A', flows into the grounding terminal and corresponds to the current i of the electromagnetic unit respectively e (t) and high voltage capacitor C1 current i C1 (t). In the invention, three input ports NI, X and G of a built-in current sensor 4 respectively correspond to three terminals of a carrier communication terminal N, an electromagnetic unit low-voltage end XL and a ground end G in a CVT secondary junction box 3, the sensor is small in size and can be directly arranged in the secondary junction box, and the pair of output pins P1-P2 output electromagnetic unit current i e (t), the P3-P4 output pins output high-voltage power Rong Dianliu i C1 (t). The anti-interference transmission line transmits the current signal to the monitoring device according to the IEC61850 communication protocol, and the monitoring device analyzes and calculates the received current signal and can correct the primary side voltage reduction formula. The invention designs a capacitive voltage transformer with the function of outputting capacitance current signals, which can realize the on-line acquisition and monitoring of the capacitance voltage transformer current signals and is directly arranged in a CVT IIThe micro-current sensor is arranged at the terminal of the secondary junction box, so that errors generated in the acquisition process are reduced, and the micro-current sensor is suitable for on-site operation and measurement.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. The capacitive voltage transformer with the capacitance current output function is characterized by comprising a capacitance voltage divider (1), an electromagnetic unit (2), a secondary junction box (3) and a built-in current sensor (4), wherein the built-in current sensor (4) is arranged in the secondary junction box (3), the capacitance voltage divider (1) comprises a high-voltage capacitor C1 and a low-voltage capacitor C2 which are electrically connected, one end of the low-voltage capacitor C2 connected with the high-voltage capacitor C1 is a low-voltage terminal A ', the other end of the low-voltage capacitor C2 is connected with a carrier communication terminal N, the low-voltage terminal A ' is led to the secondary junction box (3) and is connected with the terminal A ' of the electromagnetic unit (2), the low-voltage terminal XL, the carrier communication terminal N and a grounding end of the electromagnetic unit (2) are respectively connected with a terminal X, a terminal NI and a terminal G of an input port of the built-in current sensor (4), a primary side input port NI-X formed by the terminal NI of the built-in current sensor (4) corresponds to a secondary side output port P3-P4, and a secondary side output port X-P2 formed by the terminal X of the primary side terminal X and the terminal G corresponds to a secondary side output port P1-P2; the current flowing through the input port X-G is electromagnetic unit currentThe corresponding secondary side output pins are P1-P2; the current flowing through the input port NI-X in the primary side is the high voltage current +.>The corresponding secondary side output pins are P3-P4;
the output port of the built-in current sensor (4) is connected with a monitoring device (7) through a transmission line, and the monitoring device (7) is used for receiving a current signal output by the output port of the built-in current sensor (4) and calculating a low-voltage capacitance current and a CVT primary side total voltage according to the received current signal;
the monitoring device (7) comprises a current acquisition module, a data processing module and a monitoring module, wherein the current acquisition module is connected with the data processing module, the current acquisition module receives a current signal transmitted by an anti-interference transmission line, the data processing module analyzes and calculates the current signal to obtain a dielectric loss angle of a capacitor in a capacitive voltage divider, calculates to obtain a capacitor series equivalent resistance, corrects a primary side voltage reduction formula, and the corrected result is shown in formulas (1) - (4):
（1）
（2）
（3）
（4）
wherein, among them,for the capacitive current flowing through the low-voltage capacitor C2, < >>For the capacitance current flowing through the high voltage capacitor C1, < >>For the current flowing through the electromagnetic unit +.>Is low-voltage powerVoltage at two sides>For the voltage on both sides of the high-voltage capacitor, < >>For CVT primary side total voltage, +.>Equivalent resistance of high-voltage capacitor, +.>Is the equivalent resistance of the low-voltage capacitor,is the dielectric loss angle of the high-voltage capacitor C1, < >>Is the dielectric loss angle of the low-voltage capacitor, +.>For measuring frequency;
the electromagnetic unit (2) comprises a medium-voltage transformer T, a compensating reactor L, a protection device P and a damping device D, wherein the compensating reactor L is connected in parallel with the protection device P and is connected in series with a primary side winding of the intermediate transformer T, the damping device D is connected in parallel in a secondary winding of the intermediate transformer T, and the medium-voltage transformer T adopts an outer yoke inner iron type three-column iron core;
the built-in current sensor (4) adopts a through-type structure.
2. The capacitive voltage transformer with the capacitive current output function according to claim 1, characterized in that a carrier accessory (5) is arranged in the secondary junction box (3).
3. The capacitive voltage transformer with the capacitive current output function according to claim 1, wherein the transmission line is an anti-interference transmission line.
4. The capacitive voltage transformer with the capacitive current output function according to claim 1, wherein the medium of the high-voltage capacitor C1 and the medium of the low-voltage capacitor C2 are a polypropylene film and capacitor paper composite material.
5. The capacitive voltage transformer with a capacitive current output function according to claim 1, wherein the compensation reactor L adopts a C-shaped iron core.
6. The capacitive voltage transformer with the capacitive current output function according to claim 1, wherein the two ends of the compensation reactor L are respectively provided with a zinc oxide valve plate lightning arrester as a protection device.
7. The capacitive voltage transformer with the capacitive current output function according to claim 1, wherein the damping device D is a fast saturation type damper.
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|---|---|---|---|---|
| CN113671245A (en) * | 2021-08-18 | 2021-11-19 | 国网陕西省电力公司电力科学研究院 | Digital interface with built-in time domain integration function and time domain next-time voltage acquisition method |
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