CN103475316A - Novel scaled-down Q-mean speed regulation RC (resistor-capacitor) resonant amplifier - Google Patents
Novel scaled-down Q-mean speed regulation RC (resistor-capacitor) resonant amplifier Download PDFInfo
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- CN103475316A CN103475316A CN 201210186928 CN201210186928A CN103475316A CN 103475316 A CN103475316 A CN 103475316A CN 201210186928 CN201210186928 CN 201210186928 CN 201210186928 A CN201210186928 A CN 201210186928A CN 103475316 A CN103475316 A CN 103475316A
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Abstract
The conversion of the voltage of a capacitor voltage transformer is realized in such a manner that a high-voltage signal of a dozen kilovolts is provided by a capacitive voltage divider, and then, the high-voltage signal is converted into a low-voltage signal by an electromagnetic intermediate transformer to provide power for measurement and protection, and as high voltage exists, the structure is complicated, and the failure rate is high. In order to solve the load capacity problem of the capacitor voltage transformer, a method of electric reactor compensation is adopted, and therefore, the requirements of measurement accuracy can be met by the capacitor voltage transformer under conditions of light load and full load, but a series of problems is brought, and as an electric reactor exists, the capacitor voltage transformer has the ferromagnetic resonance problem inevitably. In order to solve the ferromagnetic resonance problem, a series of protecting components, such as a damper and the like, is additionally arranged in an electromagnetic unit, and therefore, the operational reliability of the capacitor voltage transformer is greatly reduced. Although gas insulation is also adopted in the patent technology disclosed by the patent ZL01240311.3, the problems still exist. In other words, the problems are the root of the high accident rate of the capacitor voltage transformer.
Description
Now widely used capacitance type potential transformer; the conversion of its voltage is that the high-voltage signal of tens kilovolts is provided by capacitor voltage divider; by an electromagnetic type intermediate transformer by signal convert to low voltage signal to measuring, protection provides power; due to high-tension existence; so its complex structure, failure rate is high.For solving the load capacity problem of capacitance type potential transformer, adopted the method for reactor compensation, thereby guarantee that capacitance type potential transformer all can meet the requirement of certainty of measurement under underloading and full load conditions, but brought like this series of problems, due to the existence of reactor, inevitably there is the ferro resonance problem in capacitance type potential transformer.For addressing this problem, installed a series of protection components such as damper additional in electromagnetic unit inside, greatly reduce the operational reliability of capacitance type potential transformer.Although also adopted gas-insulated in the patented technology that patent ZL01240311.3 announces, the problems referred to above still exist.This root place that namely the capacitance type potential transformer rate of failure is high.
The equal Q speed governing of novel scaled down version RC resonance amplifier, it is the Order RC feedback amplifier by the specified conditions design, there is the characteristic that keeps best Q uniformity on broadband: with duplex potentiometer, can on broadband, wait Q tuning, the tracking error is without impact, during a dull resistance, the interior Q value of wave band is even, and the limit Q difference at two ends is a little percentage. and circuit characteristic has three kinds: the standard resonance circuit type, double with integrating factor and double with differential divisor. and this to signal, processes and loop design has been brought convenience and interests.
The equal Q speed governing of novel scaled down version RC resonance amplifier by inverting amplifier and contain two in the same way the feedback control loops of phase shift RC joint form, it is characterized in that inverting amplifier is with negative feedback and the high input-impedance stage of determining its gain, gain is the desired determined value of Q, the ratio of two joint RC values is best all desired determined values of the tuning condition of Q, when two RC internodes have isolation level or when the resistance of the 2nd RC of counting from output along feedback control loop during much larger than the resistance of a RC joint, gain K=4Q2, the value of two joint RC equates.
That the current feedback of utilization by a resistance forms and for input current being converted to the transimpedance amplifier of output voltage, it is characterized in that: feedback resistance (RG) is the resistive band (1) on a substrate (5), has pair of conductive band (2 at least, 3) make linear extension with the resistive band be parallel on substrate (5), and two outer lateral terminals of every pair of conductive strips (2,3) outwards extend through two terminals of this resistive band.And be connected
For solving the problems such as capacitance type potential transformer ferro resonance and load-bearing capacity, patent of the present invention provides the equal Q speed governing of novel scaled down version RC resonance amplifier.Patent of the present invention has not only retained the advantage of existing capacitance type potential transformer, and has removed compensation reactor and supporting part thereof, fundamentally eliminates the ferro resonance problem of capacitance type potential transformer.
Adopt the low-voltage transmitter, output voltage power output not only, have advantages of not from capacitor voltage divider take out can and without transformer secondary voltage drop, thereby reach, make the capacitor voltage divider function single-minded, reliability is high, and instrument transformer is without secondary voltage drop, the purpose that accuracy is high.
The technical solution adopted in the present invention is: in insulating sleeve, high-voltage capacitance and the low-voltage capacitance of capacitor voltage divider are in series, and the two-terminal of low-voltage capacitance is drawn.The two-terminal of low-voltage capacitance connects a voltage transmitter, voltage signal is become to several required voltages and deliver on terminal board, and these voltage signals are delivered on a voltage follow power amplifier by cable, for access, measures and protection.In the time need making communication port with capacitor voltage divider, can between the voltage terminal of the plan ground connection of secondary capacitor and voltage transmitter earth terminal, connect a choke, enter voltage transmitter or earth terminal to stop high-frequency signal.No matter whether carrier interface is opened, and the earth terminal of voltage divider all can guarantee the voltage divider reliable ground, and the carrier interface that can effectively avoid general capacitance type potential transformer to exist is opened and do not carried the damage that wave device causes.Capacitor voltage divider is only drawn low pressure, sends into voltage transmitter, without the High-Voltage Insulation problem, only needs the atmospheric air insulation.Voltage transmitter only provides a reference voltage signal to the voltage follow power amplifier; the voltage follow power amplifier is loaded in control room; externally measured and protection power demand is provided by the control room power supply; this capacitance type potential transformer does not extract power from voltage divider substantially; and without adopting compensation reactor; thereby make this capacitance type potential transformer operating state away from resonance point, can prevent ferro resonance.Owing to there not being the ferro resonance problem, so the utility model electronic capacitor type voltage transformer is simple in structure, parts are few, reliability is high, and cable only transmits voltage signal, can not produce the problem of the secondary voltage drop of voltage transformer, be conducive to the raising of measurement accuracy, reached thus measure accurate, simple in structure, without ferro resonance, purpose that reliability is high.
Claims (5)
- The equal Q speed governing of novel scaled down version RC resonance amplifier by inverting amplifier and contain two in the same way the feedback control loops of phase shift RC joint form, it is characterized in that inverting amplifier is with negative feedback and the high input-impedance stage of determining its gain, gain is the desired determined value of Q, the ratio of two joint RC values is best all desired determined values of the tuning condition of Q, when two RC internodes have isolation level or when the resistance of the 2nd RC of counting from output along feedback control loop during much larger than the resistance of a RC joint, gain K=4Q2, the value of two joint RC equates.
- 2. that utilize current feedback by a resistance to form and for input current being converted to the transimpedance amplifier of output voltage.
- 3. it is characterized in that: feedback resistance (RG) is the resistive band (1) on a substrate (5), has pair of conductive band (2 at least, 3) make linear extension with the resistive band be parallel on substrate (5), and two outer lateral terminals of every pair of conductive strips (2,3) outwards extend through two terminals of this resistive band.
- 4. for solving the problems such as capacitance type potential transformer ferro resonance and load-bearing capacity, patent of the present invention provides the equal Q speed governing of novel scaled down version RC resonance amplifier.
- 5. patent of the present invention has not only retained the advantage of existing capacitance type potential transformer, and has removed compensation reactor and supporting part thereof, fundamentally eliminates the ferro resonance problem of capacitance type potential transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210186928 CN103475316A (en) | 2012-06-08 | 2012-06-08 | Novel scaled-down Q-mean speed regulation RC (resistor-capacitor) resonant amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210186928 CN103475316A (en) | 2012-06-08 | 2012-06-08 | Novel scaled-down Q-mean speed regulation RC (resistor-capacitor) resonant amplifier |
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| Publication Number | Publication Date |
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| CN103475316A true CN103475316A (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210186928 Pending CN103475316A (en) | 2012-06-08 | 2012-06-08 | Novel scaled-down Q-mean speed regulation RC (resistor-capacitor) resonant amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730942A (en) * | 2020-12-21 | 2021-04-30 | 江苏华网融智科技有限公司 | Circuit for improving load capacity of voltage sensor and circuit element constant value method |
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2012
- 2012-06-08 CN CN 201210186928 patent/CN103475316A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730942A (en) * | 2020-12-21 | 2021-04-30 | 江苏华网融智科技有限公司 | Circuit for improving load capacity of voltage sensor and circuit element constant value method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131225 |