CN110794191A - Magnetic modulation type direct current leakage protection device for inhibiting zero drift influence - Google Patents
Magnetic modulation type direct current leakage protection device for inhibiting zero drift influenceDownload PDFInfo
- Publication number
- CN110794191A CN110794191ACN201910987791.4ACN201910987791ACN110794191ACN 110794191 ACN110794191 ACN 110794191ACN 201910987791 ACN201910987791 ACN 201910987791ACN 110794191 ACN110794191 ACN 110794191A
- Authority
- CN
- China
- Prior art keywords
- zero
- circuit
- modulation type
- magnetic modulation
- protection device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002401inhibitory effectEffects0.000title1
- 238000001514detection methodMethods0.000claimsabstractdescription12
- 230000009471actionEffects0.000claimsabstractdescription7
- 230000005284excitationEffects0.000claimsdescription25
- 238000004804windingMethods0.000claimsdescription20
- 238000005070samplingMethods0.000claimsdescription7
- 230000000694effectsEffects0.000claimsdescription4
- 230000007257malfunctionEffects0.000abstractdescription3
- 239000011162core materialSubstances0.000description31
- 238000000034methodMethods0.000description16
- 230000008569processEffects0.000description7
- 238000004458analytical methodMethods0.000description3
- 238000001228spectrumMethods0.000description3
- 230000003321amplificationEffects0.000description2
- 238000010586diagramMethods0.000description2
- 238000001914filtrationMethods0.000description2
- 230000006698inductionEffects0.000description2
- 230000005415magnetizationEffects0.000description2
- 238000003199nucleic acid amplification methodMethods0.000description2
- 230000007704transitionEffects0.000description2
- 239000004020conductorSubstances0.000description1
- 230000007547defectEffects0.000description1
- 238000013461designMethods0.000description1
- 238000011161developmentMethods0.000description1
- 238000005516engineering processMethods0.000description1
- 230000004907fluxEffects0.000description1
- 238000013178mathematical modelMethods0.000description1
- 238000005259measurementMethods0.000description1
- 238000012986modificationMethods0.000description1
- 230000004048modificationEffects0.000description1
- 238000012544monitoring processMethods0.000description1
- 230000000737periodic effectEffects0.000description1
- 230000002093peripheral effectEffects0.000description1
- 238000010248power generationMethods0.000description1
- 238000012545processingMethods0.000description1
- 230000001012protectorEffects0.000description1
- 238000011896sensitive detectionMethods0.000description1
- 230000035945sensitivityEffects0.000description1
Images
Classifications
- 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
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及直流漏电保护技术领域，特别是涉及一种抑制零点漂移影响的磁调制式直流漏电保护装置。The invention relates to the technical field of DC leakage protection, in particular to a magnetic modulation type DC leakage protection device for suppressing the influence of zero point drift.
背景技术Background technique
随着光伏发电、新能源汽车、电动车充电站、智能直流配用电系统及微电网等技术不断发展，各种直流系统得到了快速发展和大面积推广应用。为保证直流系统的安全可靠运行，需要大量直流监测和保护装置。因此，开发和设计高精度直流传感器并与断路器等结合形成直流系统漏电保护装置，在直流系统中可大幅度较少人身触电等事故的发生，从而提高系统安全可靠性。With the continuous development of technologies such as photovoltaic power generation, new energy vehicles, electric vehicle charging stations, intelligent DC power distribution systems and microgrids, various DC systems have been rapidly developed and widely used. In order to ensure the safe and reliable operation of the DC system, a large number of DC monitoring and protection devices are required. Therefore, developing and designing high-precision DC sensors and combining them with circuit breakers to form a DC system leakage protection device can greatly reduce the occurrence of personal electric shock and other accidents in the DC system, thereby improving the safety and reliability of the system.
磁调制式电流互感器工作稳定时间长，且无输入时，其零漂低、受环境温度影响小、隔离式设计、灵敏度高、高线性度等优势，更适合直流漏电保护。The magnetic modulation current transformer has the advantages of long working stability and no input, low zero drift, little influence by ambient temperature, isolated design, high sensitivity, high linearity and other advantages, it is more suitable for DC leakage protection.
当存在直流漏电流时，在被测直流作用下，激磁电流波形频谱中将出现直流分量和偶次谐波分量。在此基础之上，一般有两种磁调制式直流电流的检测方法，一种是以倍频磁调制器为核心构成，通常具有双磁芯结构，通过检测磁芯二次绕组输出信号中的二次谐波分量来测量电流大小，其信号处理电路复杂，一般需经信号放大、带通滤波、相敏检波和低通滤波等步骤，测量过程繁琐；并且，双磁芯结构的互感器还会因为两个磁芯结构、尺寸及磁特性的不一致而造成虚假平衡点，使检测误差增大。另一种是通过检测采样电阻电压频谱的直流分量来测量直流漏电流的大小和方向，也称直流分量法。When there is a DC leakage current, under the action of the measured DC, DC components and even harmonic components will appear in the excitation current waveform spectrum. On this basis, there are generally two detection methods for magnetically modulated DC current. One is composed of a frequency-doubling magnetic modulator as the core, usually with a double-core structure. The second harmonic component is used to measure the current size, and its signal processing circuit is complex. Generally, steps such as signal amplification, band-pass filtering, phase-sensitive detection and low-pass filtering are required, and the measurement process is cumbersome; Due to the inconsistency of the structure, size and magnetic characteristics of the two magnetic cores, a false balance point will be created, which will increase the detection error. The other is to measure the magnitude and direction of the DC leakage current by detecting the DC component of the voltage spectrum of the sampling resistor, also known as the DC component method.
直流分量法在实际应用当中，虽然零漂低，受温度影响小，但在实际工程应用中，不能完全忽略此影响，由零漂现象造成的无输入(无漏电流)时，输出不为零的现象对后续直流漏电的检测带来了很大影响，会引起漏电保护器误动作，使装置的检测精度降低。In practical applications of the DC component method, although the zero drift is low and is less affected by temperature, in practical engineering applications, this effect cannot be completely ignored. When there is no input (no leakage current) caused by the zero drift phenomenon, the output is not zero. The phenomenon has a great impact on the subsequent detection of DC leakage, which will cause the leakage protector to malfunction and reduce the detection accuracy of the device.
发明内容SUMMARY OF THE INVENTION
本发明的目的是针对现有技术中存在的技术缺陷，而提供一种抑制零点漂移影响的磁调制式直流漏电保护装置。The purpose of the present invention is to provide a magnetic modulation type DC leakage protection device for suppressing the influence of zero point drift in view of the technical defects existing in the prior art.
为实现本发明的目的所采用的技术方案是：The technical scheme adopted for realizing the purpose of the present invention is:
一种抑制零点漂移影响的磁调制式直流漏电保护装置，包括：A magnetic modulation type DC leakage protection device for suppressing the influence of zero point drift, comprising:
两个磁调制式剩余电流互感器，每个所述磁调制式剩余电流互感器的输出端分别连接一个低通滤波电路的输入端，所述低通滤波电路的输出端与差值电路的输入端连接，所述差值电路的输出端连接绝对值电路的输入端，所述绝对值电路的输出端与控制脱扣装置动作的控制器连接。Two magnetic modulation residual current transformers, the output end of each magnetic modulation residual current transformer is respectively connected to the input end of a low-pass filter circuit, the output end of the low-pass filter circuit and the input end of the difference circuit The output end of the difference circuit is connected to the input end of the absolute value circuit, and the output end of the absolute value circuit is connected to the controller that controls the action of the tripping device.
其中，所述磁调制式剩余电流互感器采用运算放大器输出的方波电压作为互感器的激磁电压源，包括环形磁芯，运算放大器，采样电阻Rs，阈值电压设置电阻R1和R2，环形磁芯上绕有一个既作为激磁绕组，又作为检测绕组的二次绕组；阈值电压设置电阻R1的一端接运算放大器的同相输入端，另一端接地，阈值电压设置电阻R2的一端接运算放大器的同相输入端、另一端接二次绕组的一端头，运算放大器的反相输入端接采样电阻Rs非接地的另一端，并与二次绕组的另一端头连接，同时与低通滤波电路的输入端连接。Wherein, the magnetic modulation type residual current transformer adopts the square wave voltage output by the operational amplifier as the excitation voltage source of the transformer, including a toroidal core, an operational amplifier, a sampling resistor Rs , and threshold voltage setting resistors R1 and R2 , The toroidal core is wound with a secondary winding that serves as both an excitation winding and a detection winding;one end of the threshold voltage setting resistor R1 is connected to the non- inverting input of the operational amplifier, the other end is grounded, and one end of the threshold voltage setting resistor R2 is connected to the ground. The non-inverting input end of the operational amplifier and the other end are connected to one end of the secondary winding, and the inverting input end of the operational amplifier is connected to the other end of the sampling resistorRs , which is not grounded, and is connected to the other end of the secondary winding, and is connected to the low-pass The input terminal of the filter circuit is connected.
其中，当无漏电情况发生时，绝对值电路的输出信号基本为零，消除了由于零点漂移现象带来的直流分量不为零的影响；Among them, when no leakage occurs, the output signal of the absolute value circuit is basically zero, which eliminates the influence of the non-zero DC component caused by the zero-point drift phenomenon;
当出现正\负向漏电时，绝对值电路的输出值即为漏电流信号所对应直流分量值的正整数倍数。When positive/negative leakage occurs, the output value of the absolute value circuit is a positive integer multiple of the DC component value corresponding to the leakage current signal.
本发明的抑制零点漂移影响的磁调制式直流漏电保护装置，以单磁芯磁调制式的直流分量法为理论基础，选择磁芯材料、尺寸、绕线匝数、绕线方式等相同(以下简单概括为磁芯特性相同)的两个磁芯，分别接入各自的激磁电路与滤波电路，然后将其直流分量差值处理并放大，并结合单片机控制，可有效抑制零点漂移对漏电保护装置造成的影响，从而避免误动作的产生，提高装置的检测精度。The magnetic modulation type DC leakage protection device for suppressing the influence of zero point drift of the present invention is based on the DC component method of the single magnetic core magnetic modulation type, and the selection of magnetic core materials, dimensions, winding turns, winding methods, etc. are the same (below It is simply summarized as two magnetic cores with the same magnetic core characteristics), which are respectively connected to their respective excitation circuits and filter circuits, and then the difference of their DC components is processed and amplified, and combined with single-chip control, it can effectively suppress the zero-point drift on the leakage protection device. In this way, the occurrence of malfunctions can be avoided, and the detection accuracy of the device can be improved.
附图说明Description of drawings
图1为磁调制式剩余电流互感器工作原理；Figure 1 shows the working principle of the magnetic modulation residual current transformer;
图2为磁调制式剩余电流互感器激磁回路等效电路；Figure 2 is the equivalent circuit of the excitation circuit of the magnetic modulation residual current transformer;
图3为磁化曲线分段线性化的简化模型；Fig. 3 is the simplified model of piecewise linearization of magnetization curve;
图4为无漏电流时，输出波形示意图；Figure 4 is a schematic diagram of the output waveform when there is no leakage current;
图5为抑制零点漂移影响的磁调制式直流漏电保护装置的原理框图。FIG. 5 is a schematic block diagram of a magnetic modulation DC leakage protection device for suppressing the influence of zero point drift.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本发明，并不用于限定本发明。The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
基于磁调制式的直流分量法虽然零漂低，受温度影响小，但在实际工程应用中，不能完全忽略此影响，由零漂现象造成的无输入(无漏电流)时，输出不为零的现象对后续直流漏电的检测带来了很大影响。由于此零点漂移现象主要受温度影响，故同一温度下，无漏电情况发生时，磁芯特性相同的两个磁芯及外围电路因零漂现象造成的直流分量值较接近，因此，以磁调制式的直流分量法为理论基础，选择磁芯特性相同的两个磁芯，分别接入各自的激磁电路与滤波电路，然后将其直流分量差值处理并放大，并结合单片机与脱扣装置，可有效抑制零点漂移对漏电保护装置造成的影响。Although the DC component method based on magnetic modulation has low zero drift and is less affected by temperature, in practical engineering applications, this effect cannot be completely ignored. When there is no input (no leakage current) caused by the zero drift phenomenon, the output is not zero. The phenomenon has a great impact on the subsequent detection of DC leakage. Since this zero-drift phenomenon is mainly affected by temperature, under the same temperature, when no leakage occurs, the DC component values of two magnetic cores and peripheral circuits with the same magnetic core characteristics are relatively close due to the zero-drift phenomenon. The DC component method of the formula is the theoretical basis. Two magnetic cores with the same magnetic core characteristics are selected, respectively connected to their respective excitation circuits and filter circuits, and then the difference of the DC components is processed and amplified, and combined with the single-chip microcomputer and the tripping device, It can effectively suppress the effect of zero drift on the leakage protection device.
因此，本发明基于磁调制式的直流分量法，选择磁芯特性相同的两个磁芯，将待测线路正向穿过其中一个磁芯，然后再反向穿过另一个磁芯，如图5所示。反向穿过其中一个磁芯的目的是对于同一条待测线路，当发生漏电时，若其中一个磁芯中为正向漏电信号时，对于另一个磁芯来说，该信号为负向漏电信号，其各自经滤波电路处理过的新直流分量即为在同一初始的直流分量值(零漂现象造成)基础上向相反方向平移同一数值。同时，差值电路及绝对值电路，将两个磁芯对应电路的直流分量进行差值处理并放大，以此消除零漂现象的影响，并结合单片机与脱扣装置，实现直流漏电流保护功能。Therefore, the present invention is based on the DC component method of the magnetic modulation type, selects two magnetic cores with the same magnetic core characteristics, and passes the line to be tested through one of the magnetic cores in the forward direction, and then passes through the other magnetic core in the reverse direction, as shown in the figure 5 shown. The purpose of passing through one of the magnetic cores in the reverse direction is for the same line to be tested, when leakage occurs, if there is a positive leakage signal in one of the magnetic cores, for the other magnetic core, the signal is a negative leakage current. The new DC component of each signal processed by the filter circuit is the same value shifted in the opposite direction on the basis of the same initial DC component value (caused by the zero-drift phenomenon). At the same time, the difference circuit and the absolute value circuit process and amplify the DC components of the corresponding circuits of the two magnetic cores to eliminate the influence of the zero-drift phenomenon. Combined with the single-chip microcomputer and the tripping device, the DC leakage current protection function is realized. .
如图5所示，本发明的抑制零点漂移影响的磁调制式直流漏电保护装置，包括：两个磁调制原理的磁调制式剩余电流互感器，每个所述磁调制式剩余电流互感器的输出端分别连接一个低通滤波电路的输入端，所述低通滤波电路的输出端与差值电路的输入端连接，所述差值电路的输出端连接绝对值电路的输入端，所述绝对值电路的输出端与控制脱扣装置动作的控制器连接。As shown in FIG. 5 , the magnetic modulation type DC leakage protection device for suppressing the influence of zero point drift of the present invention includes: two magnetic modulation type residual current transformers based on the principle of magnetic modulation, each of which has a magnetic modulation type residual current transformer. The output ends are respectively connected to the input ends of a low-pass filter circuit, the output end of the low-pass filter circuit is connected to the input end of the difference circuit, the output end of the difference circuit is connected to the input end of the absolute value circuit, and the absolute value circuit is connected to the input end of the absolute value circuit. The output of the value circuit is connected to the controller that controls the action of the tripping device.
以上方案下，当无漏电发生时，绝对值电路的输出信号基本为零，消除了由于零点漂移现象带来的直流分量不为零的影响；Under the above scheme, when no leakage occurs, the output signal of the absolute value circuit is basically zero, eliminating the influence of the non-zero DC component caused by the zero drift phenomenon;
当出现正\负向漏电时，绝对值电路的输出值即为漏电流信号所对应直流分量值的正整数倍数。When positive/negative leakage occurs, the output value of the absolute value circuit is a positive integer multiple of the DC component value corresponding to the leakage current signal.
其中，基于磁调制原理的磁调制式剩余电流互感器,如图1所示,由环形磁芯、运算放大器、采样电阻Rs、阈值电压设置电阻R1和R2组成。互感器磁芯上绕有一个二次绕组，既作为激磁绕组，又作为检测绕组，其匝数为N2；采用运算放大器输出的方波电压作为互感器的激磁电压源。Among them, the magnetic modulation residual current transformer based on the magnetic modulation principle, as shown in Figure 1, consists of a toroidal core, an operational amplifier, a sampling resistor Rs , and threshold voltage setting resistors R1 and R2 . A secondary winding is wound on the magnetic core of the transformer, which is used as both an excitation winding and a detection winding, and the number of turns is N2 ; the square wave voltage output by the operational amplifier is used as the excitation voltage source of the transformer.
为便于分析，在满足激磁电流不超过运算放大器最大输出电流的前提下，假定运算放大器输出电压的最大值为UH，最小值为UL，且UL＝-UH。电路工作时，当采样电阻Rs上的电压达到阈值电压±Ur时，运算放大器输出电压的极性发生反转，这样电路就自动产生一个方波激磁电压。设激磁电压周期为T，频率为f。阈值电压由电阻R1、R2分压得到，满足
磁调制式剩余电流互感器激磁回路等效电路如图2所示，线路中的直流漏电流指的是正负导线中的差值电流，即ip＝iL+iN，正常情况下被测电流ip＝0。i(t)表示互感器二次绕组中的电流，即激磁电流；ψ为互感器二次绕组的总磁链；dψ/dt表示互感器二次绕组的感应电动势。The equivalent circuit of the excitation circuit of the magnetic modulation residual current transformer is shown in Figure 2. The DC leakage current in the line refers to the difference current in the positive and negative conductors, that is, ip =iL +iN , which is normally Measure the current ip =0. i(t) represents the current in the secondary winding of the transformer, that is, the excitation current; ψ is the total flux linkage of the secondary winding of the transformer; dψ/dt represents the induced electromotive force of the secondary winding of the transformer.
为简化分析，假设磁调制磁芯的磁化曲线为图3所示，在饱和阶段磁感应强度不变，在线性阶段磁感应强度由最小负值变到最大正值，饱和区与线性区的临界点Hs对应的励磁电流为Is。在此假设条件下，饱和阶段绕组电感近似为零，而线性阶段电感为恒定值L。In order to simplify the analysis, it is assumed that the magnetization curve of the magnetic modulation core is shown in Fig. 3. The magnetic induction intensity is unchanged in the saturation stage, and the magnetic induction intensity changes from the minimum negative value to the maximum positive value in the linear stage. The critical point H between the saturation region and the linear region is The excitation current corresponding tos is Is . Under this assumption, the winding inductance in the saturation phase is approximately zero, while the inductance in the linear phase is a constant value L.
由于激磁电压是一定频率的方波信号，可将磁芯在周期性正、负电压作用下的工作过程看作是正、负直流电压分别作用于电路时的过渡过程来分析，并将周期方波电压作用下的稳定状态看成一个接一个的过渡过程，建立磁调制式剩余电流互感器工作过程的数学模型。Since the excitation voltage is a square wave signal with a certain frequency, the working process of the magnetic core under the action of periodic positive and negative voltages can be regarded as the transition process when the positive and negative DC voltages act on the circuit respectively. The steady state under the action of voltage is regarded as a transition process one by one, and the mathematical model of the working process of the magnetic modulation residual current transformer is established.
以下为直流分量法的分析过程，激磁电流表达式可写成：The following is the analysis process of the DC component method, and the excitation current expression can be written as:
a0为激磁电流频谱中的直流分量，w是激磁电流角频率，an、bn是谐波系数其中，将i(t)代入，得到a0 is the DC component in the excitation current spectrum, w is the angular frequency of the excitation current, an , bn are the harmonic coefficients where, Substitute i(t) to get
由于ip＜＜IH,is＜＜IH，得到Sinceip <<IH , is <<IH , we get
磁饱和电流±is为被测电流为零时磁芯恰好达到正向和负向磁饱和时对应的激磁电流，
因此，当被测电流为直流电流时，激磁电流i(t)的直流分量幅值a0恰好等于被测直流电流ip归算到二次侧的值Ip，而它们符号相反。故激磁电流的直流分量可以反映被测直流电流的大小和方向。Therefore, when the measured current is a DC current, the magnitude a0 of the DC component of the exciting current i(t) is exactly equal to the value Ip of the measured DC current ipreduced to the secondary side, and their signs are opposite. Therefore, the DC component of the excitation current can reflect the magnitude and direction of the measured DC current.
本发明能实现，当无漏电情况发生时，绝对值电路的输出信号基本为零，消除了由于零点漂移现象带来的直流分量不为零的影响。The invention can realize that when no leakage occurs, the output signal of the absolute value circuit is basically zero, and the influence of the non-zero DC component caused by the phenomenon of zero point drift is eliminated.
而当出现正(负)向漏电情况时，由于差值电路及绝对值电路的作用，绝对值电路的输出值即为漏电流信号所对应直流分量值的正整数倍数。When there is a positive (negative) leakage current, due to the function of the difference circuit and the absolute value circuit, the output value of the absolute value circuit is a positive integer multiple of the DC component value corresponding to the leakage current signal.
本发明，以单磁芯磁调制式电流传感器原理为理论基础，通过检测励磁绕组中励磁电流的直流分量实现直流剩余电流的检测，并结合利用磁芯特性相同的两个磁芯，通过各自的激磁电路与滤波电路，将其两个新直流分量接入差值电路及绝对值电路，同时结合单片机与脱扣装置，以此消除零点漂移对检测精度的影响，提高保护装置的可靠性、灵活性与准确性。The present invention is based on the principle of a single magnetic core magnetic modulation current sensor, realizes the detection of the DC residual current by detecting the DC component of the excitation current in the excitation winding, and combines the use of two magnetic cores with the same magnetic core characteristics. The excitation circuit and the filter circuit connect the two new DC components to the difference circuit and the absolute value circuit, and at the same time combine the single chip microcomputer and the tripping device, so as to eliminate the influence of zero drift on the detection accuracy and improve the reliability and flexibility of the protection device. sex and accuracy.
由于当存在正向漏电流时，新的直流分量是在因零漂现象造成直流分量基础上向下平移一定数值，而当存在相同电流值大小的负向漏电流时，新的直流分量在此前直流分量基础上向上平移相同数值。因此，基于此，本发明选择磁芯特性相同的两个磁芯，通过差值放大以及绝对值电路，并结合单片机及脱扣装置，能实现对零点漂移现象的有效抑制，能大幅提高互感器的精度，从而使漏电保护装置能够准确动作。Because when there is a forward leakage current, the new DC component is shifted downward by a certain value on the basis of the DC component caused by the zero-drift phenomenon, and when there is a negative leakage current with the same current value, the new DC component is before the The DC component is shifted up by the same amount. Therefore, based on this, the present invention selects two magnetic cores with the same magnetic core characteristics, and through difference amplification and absolute value circuit, combined with single chip microcomputer and tripping device, can effectively suppress the phenomenon of zero point drift, and can greatly improve the transformer. accuracy, so that the leakage protection device can operate accurately.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be considered within the scope of protection of the present invention.
Claims (3)
Translated fromChinesePriority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987791.4ACN110794191A (en) | 2019-10-17 | 2019-10-17 | Magnetic modulation type direct current leakage protection device for inhibiting zero drift influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987791.4ACN110794191A (en) | 2019-10-17 | 2019-10-17 | Magnetic modulation type direct current leakage protection device for inhibiting zero drift influence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110794191Atrue CN110794191A (en) | 2020-02-14 |
Family
ID=69439371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910987791.4APendingCN110794191A (en) | 2019-10-17 | 2019-10-17 | Magnetic modulation type direct current leakage protection device for inhibiting zero drift influence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110794191A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817258A (en)* | 2020-06-29 | 2020-10-23 | 天津相和电气科技有限公司 | Magnetic modulation type direct current leakage protection device based on improved direct current component method |
| CN112670949A (en)* | 2020-12-27 | 2021-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Residual current tripping control method and residual current tripper |
| CN114062754A (en)* | 2020-08-07 | 2022-02-18 | 浙江正泰电器股份有限公司 | A residual current detection device based on TMR tunnel magnetoresistance |
| CN114089013A (en)* | 2022-01-21 | 2022-02-25 | 华中科技大学 | Zero offset suppression method based on magnetization micro-asymmetric magnetic core group mirror image matching |
| CN114755487A (en)* | 2022-06-15 | 2022-07-15 | 深圳市航智精密电子有限公司 | Fluxgate current sensor and current measuring method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360049A (en)* | 2011-09-05 | 2012-02-22 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN103308743A (en)* | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN104934931A (en)* | 2014-03-21 | 2015-09-23 | 上海电科电器科技有限公司 | Residual current protection device |
| CN204679548U (en)* | 2015-06-16 | 2015-09-30 | 常熟开关制造有限公司(原常熟开关厂） | A kind of unicoil magnetic modulation type residual current detection device |
| CN104977453A (en)* | 2014-04-10 | 2015-10-14 | 丰郅(上海)新能源科技有限公司 | No-null-shift magnetic modulation current sensor |
| CN207866886U (en)* | 2018-03-16 | 2018-09-14 | 三峡大学 | A kind of magnetic modulator current sensing means |
- 2019
- 2019-10-17CNCN201910987791.4Apatent/CN110794191A/enactivePending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360049A (en)* | 2011-09-05 | 2012-02-22 | 华中科技大学 | Virtual zero point detector for magnetic modulators |
| CN103308743A (en)* | 2013-05-24 | 2013-09-18 | 华中科技大学 | Direct current metering device |
| CN104934931A (en)* | 2014-03-21 | 2015-09-23 | 上海电科电器科技有限公司 | Residual current protection device |
| CN104977453A (en)* | 2014-04-10 | 2015-10-14 | 丰郅(上海)新能源科技有限公司 | No-null-shift magnetic modulation current sensor |
| CN204679548U (en)* | 2015-06-16 | 2015-09-30 | 常熟开关制造有限公司(原常熟开关厂） | A kind of unicoil magnetic modulation type residual current detection device |
| CN207866886U (en)* | 2018-03-16 | 2018-09-14 | 三峡大学 | A kind of magnetic modulator current sensing means |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817258A (en)* | 2020-06-29 | 2020-10-23 | 天津相和电气科技有限公司 | Magnetic modulation type direct current leakage protection device based on improved direct current component method |
| CN114062754A (en)* | 2020-08-07 | 2022-02-18 | 浙江正泰电器股份有限公司 | A residual current detection device based on TMR tunnel magnetoresistance |
| CN112670949A (en)* | 2020-12-27 | 2021-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Residual current tripping control method and residual current tripper |
| CN114089013A (en)* | 2022-01-21 | 2022-02-25 | 华中科技大学 | Zero offset suppression method based on magnetization micro-asymmetric magnetic core group mirror image matching |
| CN114089013B (en)* | 2022-01-21 | 2022-04-29 | 华中科技大学 | Zero offset suppression method based on group mirror matching of magnetized micro-asymmetric cores |
| CN114755487A (en)* | 2022-06-15 | 2022-07-15 | 深圳市航智精密电子有限公司 | Fluxgate current sensor and current measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110794191A (en) | Magnetic modulation type direct current leakage protection device for inhibiting zero drift influence | |
| ES2731812T3 (en) | Residual current protection device | |
| CN111929492B (en) | All-digital fluxgate type closed-loop current sensor and current signal acquisition method thereof | |
| JP6499650B2 (en) | Apparatus for detecting an AC component in a DC circuit and use of the apparatus | |
| CN106526287A (en) | Zero-flux micro-current sensor used for leakage current detection | |
| CN102841258A (en) | Measuring device and method for direct current supply output impedance | |
| CN110031666B (en) | A kind of direct current large current measuring device and measuring method | |
| CN107102187B (en) | Zero-flux fluxgate current sensor for measuring alternating current and direct current heavy current | |
| CN109932558A (en) | Magnetic modulation AC and DC residual current detection system based on single positive power supply | |
| US11808793B2 (en) | Detection device, inverter and detection method | |
| CN105304303A (en) | Precise AC-DC large current transformer | |
| CN110456142A (en) | Magnetic Modulation DC Leakage Current Sensor | |
| CN106291049A (en) | Current detection circuit based on two-way saturation current sensor and driving method thereof | |
| CN106018920A (en) | Single magnetic core complex waveform current sensor | |
| CN111665384B (en) | An all-digital fluxgate current sensor and its noise suppression method | |
| CN112362953A (en) | Direct current bias current detection device | |
| CN107422165B (en) | Closed-loop Hall current sensor with online demagnetization | |
| CN116794560B (en) | A broadband residual current sensor | |
| CN117233826B (en) | Beam current value measuring circuit | |
| CN111817258B (en) | Magnetic modulation type direct current leakage protection device based on improved direct current component method | |
| CN115389807B (en) | A Transformer Neutral Point DC Current Sensor Based on Fluxgate | |
| CN110412334A (en) | A Digital Zero Flux Leakage Current Sensor | |
| CN205656225U (en) | Invariable amplitude direct current pulse signal measuring circuit | |
| CN114167326A (en) | A fluxgate current sensor with closed-loop control | |
| CN1054668A (en) | A New Type Zero Flux DC Transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | Application publication date:20200214 |