CN102944725A - Full-current frequency conversion device for leakage current - Google Patents
Full-current frequency conversion device for leakage current Download PDFInfo
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Abstract
本发明涉及一种泄漏电流全电流频率转换装置，以便于对泄漏全电流进行更精确的检测；所述频率转换装置包含依次电路连接的运放模块，变容二极管，和振荡器；其中，输入所述频率转换装置的泄漏全电流，通过所述运放模块进行放大；放大后的泄漏全电流输入至所述变容二极管，由该变容二极管提供所述振荡器的可变电容参数；使得从所述振荡器输出的频率fOUT=kCB=knVIN，其中CB为所述变容二极管的电容值，VIN为装置的输入电压，k、n为所述振荡器和所述变容二极管的固有放大系数。
The invention relates to a leakage current full current frequency conversion device, so as to detect the leakage full current more accurately; the frequency conversion device includes an operational amplifier module, a varactor diode, and an oscillator connected in sequence; wherein, the input The full leakage current of the frequency conversion device is amplified by the operational amplifier module; the amplified full leakage current is input to the varactor diode, and the varactor diode provides the variable capacitance parameter of the oscillator; so that Frequency f OUT =kC B =knV IN output from the oscillator, where C B is the capacitance value of the varactor diode, V IN is the input voltage of the device, k, n are the oscillator and the variable capacitance The inherent amplification factor of the capacitor diode.
Description
技术领域 technical field
本发明涉及一种对泄漏电流泄漏全电流采集的频率转换装置。 The invention relates to a frequency conversion device for collecting leakage current leakage full current.
背景技术 Background technique
泄漏电流的泄漏全电流（以下简称全电流）包含了容性泄漏电流（以下简称容性电流）和阻性泄漏电流（以下简称阻性电流）两个部分。其中阻性电流是真正反映泄漏电流运行状态的技术参数。 Leakage current Leakage full current (hereinafter referred to as full current) includes two parts: capacitive leakage current (hereinafter referred to as capacitive current) and resistive leakage current (hereinafter referred to as resistive current). The resistive current is a technical parameter that truly reflects the operating state of the leakage current.
由于阻性电流的检测常规上必须采样全电流和电压，通过计算电压和全电流的夹角，然后利用三角函数关系推算出阻性电流。 Since the detection of resistive current must sample the full current and voltage conventionally, the resistive current is calculated by calculating the angle between the voltage and the full current, and then using the trigonometric function relationship.
阻性电流通常情况下只占全电流的10%——15%，经过两次乘法计算得出的阻性电流值误差已经比较大。造成常规检测方法的两个致命缺陷： The resistive current usually only accounts for 10%-15% of the full current, and the error of the resistive current value calculated after two multiplications is relatively large. Causes two fatal flaws in conventional detection methods:
1、检测精度较差、无法真实反映泄漏电流工作状态。 1. The detection accuracy is poor, and it cannot truly reflect the working state of the leakage current.
2、检测成本较高，由于需要使用采样电压的高压PT，无法推广。 2. The detection cost is high, and it cannot be popularized due to the need to use a high-voltage PT with sampling voltage.
发明内容 Contents of the invention
本发明的目的是提供一种泄漏电流全电流频率转换装置，以便于对泄漏全电流进行更精确的检测。 The purpose of the present invention is to provide a leakage current full current frequency conversion device so as to detect the leakage full current more accurately.
为了达到上述目的，本发明的技术方案是提供一种泄漏电流全电流频率转换装置，其包含依次电路连接的运放模块，变容二极管，和振荡器； In order to achieve the above object, the technical solution of the present invention is to provide a leakage current full current frequency conversion device, which includes an operational amplifier module, a varactor diode, and an oscillator connected in sequence;
其中，输入所述频率转换装置的泄漏全电流，通过所述运放模块进行放大；放大后的泄漏全电流输入至所述变容二极管，由该变容二极管提供所述振荡器的可变电容参数；使得从所述振荡器输出的频率fOUT=kCB=k nVIN，其中CB为所述变容二极管的电容值，VIN为装置的输入电压，k、n为所述振荡器和所述变容二极管的固有放大系数。 Wherein, the full leakage current input to the frequency conversion device is amplified by the operational amplifier module; the amplified full leakage current is input to the varactor diode, and the varactor diode provides the variable capacitance of the oscillator Parameter; make the frequency f OUT =kC B =k nV IN output from the oscillator, where C B is the capacitance value of the varactor diode, V IN is the input voltage of the device, and k, n are the oscillator and the inherent amplification factor of the varactor.
优选的实施例中，放大系数k=0.5，n=10，则所述振荡器输出的频率fOUT=0.5CB，CB=10VIN，fOUT=5VIN。 In a preferred embodiment, the amplification factor k=0.5, n=10, then the oscillator output frequency f OUT =0.5C B , C B =10V IN , f OUT =5V IN .
附图说明 Description of drawings
图1是本发明所述泄漏电流全电流频率转换装置的示意图。 FIG. 1 is a schematic diagram of a leakage current full current frequency conversion device according to the present invention.
具体实施方式 Detailed ways
如图1所示，本发明所述泄漏电流全电流频率转换装置，设置有依次电路连接的运放模块A，变容二极管B，和振荡器C。 As shown in FIG. 1 , the leakage current full current frequency conversion device of the present invention is provided with an operational amplifier module A, a varactor diode B, and an oscillator C which are sequentially connected in a circuit.
优选的实施例中，运放模块A的型号为TL062；变容二极管B的型号为1NS6CB；振荡器C的型号为VFC32。 In a preferred embodiment, the model of the operational amplifier module A is TL062; the model of the varactor diode B is 1NS6CB; the model of the oscillator C is VFC32.
具体的，泄漏全电流从本装置的IN端输入所述运放模块A，通过运放模块A对泄漏全电流进行放大。放大后的泄漏全电流输入所述变容二极管B，由变容二极管B提供所述振荡器C可变的电容参数。 Specifically, the full leakage current is input into the operational amplifier module A from the IN terminal of the device, and the full leakage current is amplified by the operational amplifier module A. The amplified leakage full current is input into the varactor diode B, and the varactor diode B provides the variable capacitance parameter of the oscillator C.
所述振荡器C的输出OUT为频率fOUT=kCB，其中CB为变容二极管B的电容值。CB=nVIN，fOUT=k nVIN，k，n为相应器件的固有放大系数。一个优选的实例中，k=0.5，n=10，则本装置输出的频率fOUT=0.5CB，CB=10VIN，fOUT=5VIN。 The output OUT of the oscillator C has a frequency f OUT =kC B , where C B is the capacitance value of the varactor diode B. C B =nV IN , f OUT =k nV IN , k, n is the inherent amplification factor of the corresponding device. In a preferred example, k=0.5, n=10, then the output frequency of the device is f OUT =0.5C B , C B =10V IN , f OUT =5V IN .
尽管本发明的内容已经通过上述优选实施例作了详细介绍，但应当认识到上述的描述不应被认为是对本发明的限制。在本领域技术人员阅读了上述内容后，对于本发明的多种修改和替代都将是显而易见的。因此，本发明的保护范围应由所附的权利要求来限定。 Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333208A (en) * | 2003-03-11 | 2004-11-25 | Fuji Electric Systems Co Ltd | Ultra-small current / frequency converter |
| CN101762766A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Arrester full current frequency conversion circuit and method thereof |
| CN202975118U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Full-current frequency conversion apparatus for leakage current |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333208A (en) * | 2003-03-11 | 2004-11-25 | Fuji Electric Systems Co Ltd | Ultra-small current / frequency converter |
| CN101762766A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Arrester full current frequency conversion circuit and method thereof |
| CN202975118U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Full-current frequency conversion apparatus for leakage current |
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Application publication date: 20130227 |