CN101387670B - Dielectric loss on-line measurement apparatus for power capacitor - Google Patents

Dielectric loss on-line measurement apparatus for power capacitor Download PDF

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Publication number
CN101387670B
CN101387670B CN2008102185115A CN200810218511A CN101387670B CN 101387670 B CN101387670 B CN 101387670B CN 2008102185115 A CN2008102185115 A CN 2008102185115A CN 200810218511 A CN200810218511 A CN 200810218511A CN 101387670 B CN101387670 B CN 101387670B
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China
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power capacitor
capacitor
dielectric loss
power
voltage
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CN2008102185115A
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Chinese (zh)
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CN101387670A (en
Inventor
刘文泽
蔡泽祥
刘刚
冯顺萍
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华南理工大学
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Abstract

The invention discloses a medium loss online measuring device for power capacitors, comprising a voltage transformer, a current transformer, a thermocouple, a patch thermocouple, a multi-channel data selector, a data acquisition card, a computer and a display device which are connected via cable signal lines, wherein the another ends of the thermocouple and the patch thermocouple are connected with the multi-channel data selector and the data acquisition card in turn, the voltage transformer and the current transformer are respectively connected with the data acquisition card, and the data acquisition card is connected with the computer and the display device. The medium loss online measuring device can measure the non-electric parameters of the environment temperature and the shell stable temperature of a power capacitor as well as measure the operation voltage and the operation current of the power capacitor, to accurately measure the medium loss of the power capacitor in operation.

Description

A kind of dielectric loss on-line measurement apparatus of power capacitor
Technical field
The present invention relates to a kind of technical field of power equipment on-line monitoring, particularly a kind of on-Line Monitor Device that is applied to the dielectric loss of the high-voltage power capacitor in the AC electric power systems.
Background technology
Along with The development in society and economy, society's power consumption increases rapidly, the scale and the transmission capacity of electric system also increase rapidly, power capacitor is widely used in the reactive power compensation of AC electric power systems or the filtering link of direct current transportation, and the safe and reliable operation of power capacitor can support the stable and assurance quality of voltage of voltage of electric system effectively.Because the power capacitor group is used for jumbo reactive power compensation occasion, it is in operation and is subjected to the main factor affecting of damaging such as superpotential, excess current, temperature, harmonic wave easily, cause the dielectric loss of capacitor to increase unusually, make that single capacitor is easy to damage, thereby cause whole group capacitor group to be stopped transport, even might cause serious power equipment accident and personal safety.And the actual motion dielectric loss of power capacitor can be carried out monitoring calculation by on-Line Monitor Device, thereby effectively judges the medium insulation situation of capacitor, in time to the damage failure prediction of capacitor and send warning message.Therefore, strengthen the on-line operation monitoring to the capacitor group, prevention capacitor group accident also improves capacitor group reliability, to the reliability that improves electric system with guarantee that the quality of power supply is significant.
The power capacitor that is widely used in the filtering link of AC electric power systems or direct current transportation at present is an all-film power capacitor, and its rated voltage overwhelming majority is 6.3~12kV, and frequency of operation is 50Hz, and its interior media is made of polypropylene film and impregnant.Because the more original film paper structure capacitor of dielectric loss of power capacitor significantly reduces now, dielectric loss angle tangent tan δ reaches below 0.02%, its power attenuation angle is about 0.011 ° of angle, 89.989 ° of angles, the phasing degree of electric current phasor leading voltage phasor, very near ideal capacitor, therefore, pressing the power attenuation definition of capacitor calculates, to accurately measure very little electrical angle with respect to 90 ° of angles, if only rely on voltage on the capacitor by present employing, current signal is measured and computing, measuring error is big, is difficult to guarantee the accuracy of measurement of measurement result.So the device that proposes a kind of dielectric loss of high precision online measuring power capacitor has become an urgent demand that improves the Operation of Electric Systems reliability.
Summary of the invention
The object of the present invention is to provide a kind of dielectric loss on-Line Monitor Device of high-precision three-phase power capacitor group, can realize the actual motion dielectric loss of each capacitor of on-line monitoring, and effectively judge the medium insulation situation of capacitor, in time to the damage failure prediction of capacitor and send warning message.
For reaching above-mentioned purpose, the present invention adopts following technical scheme: a kind of dielectric loss on-line measurement apparatus of power capacitor, interconnect by the cable signal line, and comprising:
Be used to obtain the voltage transformer (VT) of power capacitor voltage signal, the primary side of described voltage transformer (VT) is arranged on the two ends of power capacitor, and secondary side is connected with data collecting card;
Be used to obtain the current transformer of power capacitor current signal, described current transformer is installed on one of them sleeve pipe and the capacitor junction of every power capacitor, and secondary side is connected with data collecting card;
Be used to measure the thermopair of power capacitor environment temperature, in the interval of described thermopair between any two power capacitors, its other end is connected with the multi-channel data selector switch; Described thermopair is a preferred version in the interval between any two-phase power capacitor;
Be used to measure the paster thermopair of the shell steady temperature of power capacitor, described paster thermopair is affixed on the power capacitor body, and its other end is connected with the multi-channel data selector switch; Described paster thermopair is affixed on the power capacitor body and highly located to be preferred version that the degree of accuracy of the shell steady temperature of the capacitor that measures is the highest in three minutes two herein;
Be used for temperature signal is carried out the multi-channel data selector switch that multichannel is selected processing;
Be used for power capacitor voltage, current signal and process multichannel are selected to handle the data collecting card that temperature signal is afterwards gathered;
Be used to realize the data that the data capture card collects are handled, reported to the police and the computing machine of monitoring in real time;
Be used to show Computer Processing result's display;
Wherein, thermopair, the paster thermopair other end are connected with data collecting card successively with the multi-channel data selector switch, the voltage transformer (VT) summation current transformer also respectively with the data acquisition card connection, data collecting card is connected with display successively with computing machine.
In order to realize the present invention better, described voltage transformer (VT) is meant the voltage transformer (VT) more than 0.5 grade, phase angle error deviation≤2% of each voltage transformer (VT) under power frequency.
Described voltage transformer (VT) has three groups of A, B, C, respectively corresponding power capacitor group A, B, C voltage in three phases.
Described current transformer is meant the current transformer of high precision, band gap slope film alloy magnetic core, and its output signal is analog electrical signal or analog optical signal.
Described multi-channel data selector switch is meant 28 road multi-channel data selector switchs.
Described data collecting card be meant the highest real-time sampling speed be 40MS/s, analog bandwidth be 10MHz, A/D conversion resolution be 12, input voltage be-15~+ the simulated data switching signal capture card of 15V with 32 road analog input ends.
Described computing machine is meant industrial computer.
Described computing machine has Man Machine Interface.
The measuring principle of the dielectric loss on-line measurement apparatus of power capacitor of the present invention is such:
The dielectric loss tangent value of power capacitor is: tan δ = P S 2 - P 2 ;
Wherein P is the steady-state loss active power of power capacitor: P=Q d+ Q f,
The heat loss through convection amount of power capacitor is: Q d=α (t W-t 0) A
In the formula, α is the heat loss through convection coefficient, and unit is W/ (m 2℃); t WBe the hottest temperature of power capacitor shell (being positioned at power capacitor body 2/3rds highly locates) that unit is ℃; t 0Be environment temperature, unit is ℃; A is a power capacitor efficiently radiates heat area, and unit is m 2
Power capacitor heat loss through radiation amount is: Q f = 5.7 ϵ [ ( 273 + t W 100 ) 4 + ( 273 + t 0 100 ) 4 ] · A ,
In the formula, ε is a power capacitor shell radiation coefficient, and span is 0.91~0.95; t WBe the hottest temperature of power capacitor shell (being positioned at power capacitor body 2/3rds highly locates) that unit is ℃; t 0Be environment temperature, unit is ℃; A is a power capacitor efficiently radiates heat area, and unit is m 2
Wherein S is the applied power of power capacitor: S=UI,
In the formula, U is a voltage effective value on the power capacitor, and I is the current effective value of power capacitor;
Therefore, as long as measure voltage, electric current, environment temperature, the hottest temperature of power capacitor shell of power capacitor, just can calculate the dielectric loss of power capacitor in service.
The capacitor platform number of general high-voltage power capacitor group is many, the reactive power capacity is big, therefore the capacitor group generally adopts the framework split-type structural, be that the many power capacitors by 24 or 30 same capabilities (as every 334kvar) of capacitor group are formed, its mode of connection is generally 8 or 10 capacitors and is unified into a phase, three-phase capacitor (totally 24/30) is connected into a capacitor group by the Y type, adopts the star or the double star connection of isolated neutral.These characteristics at the power capacitor group, the dielectric loss on-line measurement apparatus of power capacitor of the present invention is like this work: the primary side of voltage transformer (VT) is arranged on the two ends of every phase power capacitor, obtains the ac voltage signal (being the ac voltage signal of every power capacitor) of every phase power capacitor by the secondary side of voltage transformer (VT); One of them sleeve pipe and capacitor junction from every power capacitor, obtain the current signal that flows through every power capacitor by the gapped current transformer of magnetic core, voltage, current signal be input to and 32 the tunnel import in simulated data conversion (ADC) data acquisition card more (according to the needs that calculate, sample frequency 〉=20kHz); In addition thermopair is placed in the interval between any two power capacitors (to place and be preferred version in the interval between any two-phase power capacitor), be used to measure the environment temperature of power capacitor, its output is connected with the multi-channel data selector switch; The paster thermopair is affixed on the skin temperature of highly locating to measure every capacitor in three minutes two of every power capacitor body, these temperature signals are converted to voltage signal handle through 28 road multi-channel data selector switchs after, import again in simulated data conversion (ADC) data acquisition card (because variation of temperature is slower, sample frequency is that 200Hz gets final product); Measuring-signals such as these electric currents, voltage, temperature are chosen as suitable analog voltage signal output at the output terminal of mutual inductor, thermopair, deliver in the modulus capture card by the cable signal line, being converted to digital quantity delivers in the industrial computer again, after the calculation process by industrial computer, draw the operation dielectric loss of power capacitor, be presented on the display.Industrial computer adopts the operation platform of LabView measuring table as surveying work, according to the semaphore of being imported, calculates the true dielectric loss value of every power capacitor operation.Industrial computer can also be with the current effective value of the power capacitor that records and the steady temperature value of power capacitor shell, with temperature limit relatively, realize the fault pre-alarming of capacitor, enlarge the protection information that provides for preventing capacitor group fault.Industrial computer also is provided with Man Machine Interface, can realize voltage, the current data of Displaying timer record or failure process, the inquiry of historical data, and frequency analysis, current operation shows, fault pre-alarming, functions such as data output.
The present invention with respect to the major advantage and the beneficial effect of prior art is: the loss measurement of (1) existing power condenser dielectric mainly is an off-line measurement, promptly capacitor dispatch from the factory test or install before experimental test the time carry out, be not the vacuum dielectric loss when directly measuring the power capacitor on-line operation; Or be actual motion voltage, current measurement value and the phase differential that utilizes power capacitor, the dielectric loss of power capacitor moved obtain, its shortcoming is because the dielectric loss angle of capacitor is very little, the deviation of the phase angle error of mutual inductor is greater than dielectric loss angle, thereby can not be economical and the accurate dielectric loss during the Measurement of capacitor operation.And device of the present invention, utilize the active loss heating of power capacitor to cause that the capacitor case temperature raises, data according to the voltage of being surveyed, current value, skin temperature, environment temperature, the online operating dielectric loss that draws power capacitor, the measuring accuracy height, the operational monitoring, insulation ag(e)ing, fault pre-alarming, the fault capacitor that can be power capacitor are located the information that highly effective is provided fast; (2) of the present invention with low cost, only need increase thermocouple assembly in original on-line monitoring equipment gets final product with relevant computed in software function, therefore, can large tracts of land promote in development test, temperature rise test and the operation enterprise of power capacitor, having to provide the on-the-spot accurately social benefit that supports data and enhance productivity.
Description of drawings
Fig. 1 is the block diagram of the dielectric loss on-line measurement apparatus of power capacitor of the present invention;
Fig. 2 is the functional module connection layout of the dielectric loss on-line measurement apparatus of power capacitor of the present invention;
Fig. 3 is current transformer, voltage transformer (VT), paster thermopair, the connection diagram of thermopair on a power capacitor of the dielectric loss on-line measurement apparatus of power capacitor of the present invention;
Fig. 4 is voltage transformer (VT), current transformer, paster thermopair, the connection diagram of thermopair on three-phase power capacitor group of the dielectric loss on-line measurement apparatus of power capacitor of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment
Many, the reactive power characteristics capacious of capacitor platform number at the high-voltage power capacitor group, the capacitor group generally adopts the framework split-type structural, be that the many power capacitors by 24 or 30 same capabilities (as every 334kvar) of capacitor group are formed, its mode of connection is generally 8 or 10 capacitors and is unified into a phase, three-phase capacitor (totally 24/30) is connected into a capacitor group by the Y type, adopts the star or the double star connection of isolated neutral.
Now the capacitor group that forms with 24 capacitors is an example, describe the course of work of the dielectric loss on-line measurement apparatus of power capacitor of the present invention in detail: according to measuring principle of the present invention, for each capacitor group, need to measure the steady temperature of working voltage, the electric current that flows through every power capacitor, the residing environment temperature of this capacitor group and every power capacitor shell on A, B, the C three-phase power capacitor.Device of the present invention is interconnected to constitute by the cable signal line by voltage transformer (VT) 1, current transformer 2, paster thermopair 3, thermopair 4, multi-channel data selector switch 5, data collecting card 6, computing machine 8 and display 7, its block diagram is as shown in Figure 1: thermopair 4, paster thermopair 3 other ends are connected with data collecting card 6 successively with multi-channel data selector switch 5, voltage transformer (VT) 1 summation current transformer 2 also is connected with data collecting card 6 respectively, and data collecting card 6 is connected with display 7 successively with computing machine 8.Wherein, the voltage transformer (VT) that voltage transformer (VT) 1 adopts more than 0.5 grade, phase angle error deviation≤2% of each voltage transformer (VT) under power frequency; Voltage transformer (VT) 1 has three groups of A, B, C, respectively corresponding capacitor group A, B, C voltage in three phases; Current transformer 2 adopts the current transformer of high precision, band gap slope film alloy magnetic core, and its output signal is analog electrical signal or analog optical signal; Multi-channel data selector switch 5 is meant 28 road multi-channel data selector switchs; Data collecting card 6 adopt the highest real-time sampling speed be 40MS/s, analog bandwidth be 10MHz, A/D conversion resolution be 12, input voltage be-15~+ the simulated data switching signal capture card (ADC) of 15V with 32 road analog input ends; Computing machine 8 adopts industrial computer, it utilizes the operation platform of LabView measuring table as surveying work, according to the semaphore of being imported, calculates the true dielectric loss value of every power capacitor operation, be presented on the display 7, and can realize reporting to the police and monitoring in real time.
Fig. 3 is current transformer 2, voltage transformer (VT) 1, paster thermopair 3, the connection diagram of thermopair 4 on a power capacitor of the dielectric loss on-line measurement apparatus of power capacitor of the present invention, the primary side of voltage transformer (VT) 1 is connected the two ends of power capacitor 9, and secondary side connects data collecting card 6; Current transformer 2 is installed on one of them sleeve pipe and the capacitor junction of power capacitor 9, and secondary side is connected with data collecting card 6 by the cable signal line; In the interval of thermopair 4 between any two power capacitors, the optimum position is that its other end is connected with multi-channel data selector switch 5 in any interval between the two-phase power capacitor; Paster thermopair 3 is affixed on three minutes two of power capacitor 9 bodies highly places, and its other end is connected with multi-channel data selector switch 5; The connected mode of Fig. 3 is applied on the whole power capacitor group as shown in Figure 4, Fig. 4 is voltage transformer (VT) 1, current transformer 2, paster thermopair 3, the connection diagram of thermopair 4 on three-phase electric power apparatus of the dielectric loss on-line measurement apparatus of power capacitor of the present invention, the primary side of voltage transformer (VT) 1 connects the two ends of every phase power capacitor, obtain ac voltage signal from the secondary side of voltage transformer (VT) 1, secondary side connects data collecting card 6, voltage transformer (VT) 1 has three groups of A, B, C, respectively corresponding capacitor group A, B, C voltage in three phases; Current transformer 2 is installed on one of them sleeve pipe and the capacitor junction of every power capacitor, and the secondary side of current transformer 2 is connected with data collecting card 6 by the cable signal line; Thermopair 4 is in any interval between the two-phase power capacitor, and its other end is connected with multi-channel data selector switch 5, and paster thermopair 3 is affixed on three minutes two of power capacitor body and highly locates, and its other end is connected with multi-channel data selector switch 5.
The dielectric loss on-line measurement apparatus of power capacitor of the present invention is work like this: as shown in Figure 2, the current signal that the voltage signal that voltage transformer (VT) 1 obtains, current transformer 2 obtain be input to 32 the tunnel import more carry out in simulated data conversion (ADC) data collecting card 6 analog to digital conversion (according to the needs that calculate, sample frequency 〉=20kHz); The skin temperature of the power capacitor 9 that records of the environment temperature measured of thermopair 4 and paster thermopair 3 in addition, after the signal selection through multi-channel data selector switch 5, import again and carry out analog to digital conversion (because variation of temperature is slower, sample frequency is that 200Hz gets final product) in simulated data conversion (ADC) data collecting card 6; Measuring-signals such as these electric currents, voltage, temperature are chosen as suitable analog voltage signal output at the output terminal of mutual inductor, thermopair, deliver in the data collecting card 6 by the cable signal line, being converted to digital quantity delivers in the industrial computer 8 again, calculate by industrial computer 8, draw the operation dielectric loss of power capacitor, on display 7, show.Industrial computer 8 adopts the operation platform of LabView measuring table as surveying work, according to the semaphore of being imported, calculates the true dielectric loss value of every power capacitor operation.The dielectric loss of calculating owing to this moment has comprised the caused dielectric losses of reason such as harmonic wave, thereby accurately, has truly reflected the operating dielectric loss of capacitor than general only utilize voltage, the measured dielectric loss that obtains of the magnitude of current.
In addition, industrial computer can also be with the current effective value of the power capacitor that records and the steady temperature value of power capacitor shell, with temperature limit relatively, realize the fault pre-alarming of capacitor, enlarge the protection information that provides for preventing capacitor group fault.Industrial computer also is provided with Man Machine Interface, can realize man-machine interaction, realizes voltage, the current data of Displaying timer record or failure process, the inquiry of historical data, and frequency analysis, current operation shows, fault pre-alarming, functions such as data output.
[0045] the foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims (8)

1. the dielectric loss on-line measurement apparatus of a power capacitor interconnects by the cable signal line, comprising:
Be used to obtain the voltage transformer (VT) of power capacitor voltage signal, the primary side of described voltage transformer (VT) is arranged on the two ends of power capacitor, and secondary side is connected with data collecting card;
Be used to obtain the current transformer of power capacitor current signal, described current transformer is installed on one of them sleeve pipe and the capacitor junction of every power capacitor, and secondary side is connected with data collecting card;
Be used to measure the thermopair of power capacitor environment temperature, in the interval of described thermopair between any two power capacitors, its other end is connected with the multi-channel data selector switch;
Be used to measure the paster thermopair of the shell steady temperature of power capacitor, described paster thermopair is affixed on the power capacitor body, and its other end is connected with the multi-channel data selector switch;
Be used for temperature signal is carried out the multi-channel data selector switch that multichannel is selected processing;
Be used for power capacitor voltage, current signal and process multichannel are selected to handle the data collecting card that temperature signal is afterwards gathered;
Be used to realize the data that the data capture card collects are handled, reported to the police and the computing machine of monitoring in real time;
Be used to show Computer Processing result's display;
Wherein, thermopair, the paster thermopair other end are connected with data collecting card successively with the multi-channel data selector switch, the voltage transformer (VT) summation current transformer also respectively with the data acquisition card connection, data collecting card is connected with display successively with computing machine.
2. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that described voltage transformer (VT) has three groups of A, B, C, respectively corresponding power capacitor group A, B, C voltage in three phases.
3. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that described current transformer is meant the current transformer of high precision, band gap slope film alloy magnetic core, its output signal is analog electrical signal or analog optical signal.
4. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that described multi-channel data selector switch is meant 28 road multi-channel data selector switchs.
5. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that, described data collecting card be meant the highest real-time sampling speed be 40MS/s, analog bandwidth be 10MHz, A/D conversion resolution be 12, input voltage be-15~+ the simulated data switching signal capture card of 15V with 32 road analog input ends.
6. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that described computing machine is meant industrial computer.
7. according to the dielectric loss on-line measurement apparatus of claim 1 or 6 described power capacitors, it is characterized in that described computing machine is provided with Man Machine Interface.
8. according to the dielectric loss on-line measurement apparatus of the described power capacitor of claim 1, it is characterized in that, in the interval of described thermopair between any two-phase power capacitor.
CN2008102185115A 2008-10-21 2008-10-21 Dielectric loss on-line measurement apparatus for power capacitor CN101387670B (en)

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