CN111007436A - Electric leakage detection device - Google Patents
Electric leakage detection device Download PDFInfo
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- CN111007436A CN111007436A CN201911380611.2A CN201911380611A CN111007436A CN 111007436 A CN111007436 A CN 111007436A CN 201911380611 A CN201911380611 A CN 201911380611A CN 111007436 A CN111007436 A CN 111007436A
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- current
- circuit
- residual current
- zero line
- residual
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
Abstract
Disclosed in this application is a leakage detection device, comprising: residual current coil, special chip peripheral circuit and special chip; the residual current coil and the peripheral circuit of the special chip are both connected with the special chip, the special chip is used for separating the instantaneous value of the zero line current from the residual current, and the residual current coil is used for measuring and obtaining the zero line current and the residual current. The method and the device solve the technical problems that in the prior art, because the phase information is lost due to the fact that the simple effective value subtraction is not the vector subtraction, the real leakage current cannot be represented, the practical leakage current precision cannot meet the practical requirement due to the fact that the corrected error is inconsistent with the temperature coefficient of a live wire and zero line channel, and the like, and the live wire current minus the zero line current can only obtain very rough leakage current information.
Description
Technical Field
The application relates to the technical field of intelligent electric energy meters, in particular to an electric leakage detection device.
Background
At present, the intelligent electric energy meter is mainly used for completing electric energy metering of active power, reactive power and the like and measuring electric parameters of voltage, current, power and the like, and the measurement of zero line current is also included. The intelligent development is mainly embodied in meter reading, payment and the like, but the detection and diagnosis of the electricity utilization safety of the user are lacked.
In the aspect of safety detection, safety protection is realized mainly by installing an earth leakage protection switch and a short-circuit protection switch by a user at present. The leakage protection switch uses a fixed threshold, once the threshold is exceeded, power supply is cut off to implement protection, if the threshold is not exceeded, the leakage condition cannot be reported even if the leakage condition exists, the early warning function cannot be realized, the insulation problem caused by line aging cannot be solved, and the potential safety hazard cannot be effectively eliminated.
The current smart electric meter uses traditional measurement chip, though traditional measurement chip possesses the measurement function of live wire electric current and zero line electric current, nevertheless because: simple effective value subtraction, rather than vector subtraction, loses phase information and cannot represent true leakage current; in view of the reasons that the corrected error is inconsistent with the temperature coefficient of the live wire and zero line channel, the actual leakage current precision is difficult to meet the practical requirement, and the like, the live wire current minus the zero line current can only obtain very rough leakage current information.
Disclosure of Invention
The application provides a leakage detection device, has solved because simple effective value subtracts rather than vector subtracting and has lost phase information among the prior art, can not represent real leakage current and in view of the error of correction and the temperature coefficient nonconformity of live wire zero line passageway, and the actual leakage current precision is difficult to reach reasons such as practicality requirement for use live wire electric current to subtract zero line electric current and can only obtain the technical problem of very rough leakage current information.
The application provides a leakage detection device, includes:
residual current coil, special chip peripheral circuit and special chip;
the residual current coil and the peripheral circuit of the special chip are both connected with the special chip, the special chip is used for separating the instantaneous value of the zero line current from the residual current, and the residual current coil is used for measuring and obtaining the zero line current and the residual current.
Optionally, the special chip includes a residual current measuring circuit connected to the special chip peripheral circuit, and the residual current measuring circuit is configured to output the residual current sampled by the resistor to the gain and phase correction circuit, so that the phase correction circuit performs gain and phase correction on the residual current and outputs the residual current to the residual current effective value calculating circuit.
Optionally, the special chip includes a residual current effective value calculation circuit, connected to the gain and phase correction circuit, and configured to receive a residual current output by the gain and phase correction circuit and perform a squaring or root-opening operation on the residual current.
Optionally, the special chip includes a zero line current instantaneous sampling calculation circuit, connected to the gain and phase correction circuit, and configured to receive a residual current output by the gain and phase correction circuit, and subtract the residual current from a live line current vector to obtain a zero line current instantaneous value.
Optionally, the special chip further includes a zero line current effective value calculating circuit, connected to the zero line current instantaneous sampling calculating circuit, and configured to receive a zero line current instantaneous value output by the zero line current instantaneous sampling calculating circuit, and calculate the zero line current instantaneous value to obtain a zero line current effective value.
Optionally, the dedicated chip peripheral circuit includes a live wire current sampling coil, connected to the dedicated chip, for sampling live wire current.
Optionally, the material of the live wire current sampling coil is manganin.
Optionally, the dedicated chip includes a live wire measuring circuit, connected to the live wire current sampling coil, for correcting the live wire current.
Optionally, the dedicated chip peripheral circuit includes a resistance voltage divider circuit connected to the dedicated chip for reducing the voltage sine wave signal into a weak signal.
Optionally, the dedicated chip further includes a voltage measurement circuit connected to the resistance voltage divider circuit, and configured to correct the weak signal.
According to the technical scheme, the embodiment of the application has the following advantages:
in this application, a leakage detecting device is provided, including:
residual current coil, special chip peripheral circuit and special chip;
the residual current coil and the peripheral circuit of the special chip are both connected with the special chip, the special chip is used for separating the instantaneous value of the zero line current from the residual current, and the residual current coil is used for measuring and obtaining the zero line current and the residual current.
The application provides a leakage detection device, through introducing the residual current coil, realize accurate electric leakage measurement through special measurement chip to can resume zero line electric current from the residual current through vector operation, with this measurement of realizing leakage current and zero line electric current simultaneously. Through being applied to smart electric meter with this special chip, can compromise the measurement demand of traditional zero line electric current and leak current measurement's demand simultaneously. The method and the device solve the technical problems that in the prior art, because the phase information is lost due to the fact that the simple effective value subtraction is not the vector subtraction, the real leakage current cannot be represented, the practical leakage current precision cannot meet the practical requirement due to the fact that the corrected error is inconsistent with the temperature coefficient of a live wire and zero line channel, and the like, and the live wire current minus the zero line current can only obtain very rough leakage current information.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a leakage detection device provided in the present application.
Reference numerals: a residual current coil 201; a live current sampling coil 202;a resistance voltage-dividing circuit 203; a voltage measurement circuit 204; a residual current measurement circuit 205; live wire measuring circuit206; a zero line current instantaneous sampling calculation circuit 207; a live line current effective value calculation circuit 208; a hot line power calculation circuit 209; a residual current effective value calculation circuit 210; a zero line current effective value calculation circuit 211; a zero line power calculation circuit 212; the effective voltage value calculation circuit 213.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a pair of electric leakage detection device has solved because simple effective value subtracts rather than vector and has lost phase information among the prior art, can not represent real leakage current and in view of the error of correction and the temperature coefficient nonconformity of live wire zero line passageway, and the actual leakage current precision is difficult to reach reasons such as practicality requirement for use live wire electric current to subtract zero line electric current and can only obtain the technical problem of very rough leakage current information.
For easy understanding, refer to fig. 1, which is a schematic structural diagram of an embodiment of an electrical leakage detection apparatus provided in the present application.
The embodiment of the application provides a leakage detection device, includes:
residual current coil 201, special chip peripheral circuit and special chip;
the residual current coil 201 and a peripheral circuit of the special chip are both connected with the special chip, the special chip is used for separating an instantaneous value of the zero line current from the residual current, and the residual current coil 201 is used for measuring and obtaining the zero line current and the residual current.
It should be noted that, in the leakage detection device provided by the present application, the residual current coil 201 is used to replace the zero-line current transformer in the prior art, as shown in fig. 1, the left side of the dotted line in the drawing is a dedicated chip peripheral circuit, and the right side of the dotted line is the dedicated chip internal circuit structure. After the residual current is sampled by the residual current coil 201, the residual current is output to an internal circuit of the special chip, and the residual current is processed by an internal circuit of the special chip to obtain a null line current effective value. And the peripheral circuit of the special chip is used for sampling the live wire current, outputting the live wire current to the interior of the special chip and processing the live wire current to obtain the power and the electric energy of the live wire current. The special chip peripheral circuit is also used for outputting a 220V voltage sine wave signal to the special chip internal circuit for processing to obtain zero line power and electric energy.
The live line active power of the single-phase meter is defined as:
the zero line active power of the single-phase meter is defined as:
the line current sampling coil 202 and line measurement circuitry 206 of fig. 1 may obtain a line current vector:
the resistance voltage divider circuit 203 and the voltage measurement circuit 204 in fig. 1 can obtain a voltage vector:
the residual current coil 201 and the residual current measuring circuit 205 in fig. 1 can obtain a residual current vector:
the vector of the zero line current is then:
therefore, the leakage current detection, the zero line current measurement and the zero line power measurement can be realized. In addition, the leakage current value that home-use residual current coil 201 can measure under the general condition is below 300mA, when the difference between live wire and zero line is greater than 300mA, can regard as the trouble that steals electricity, wiring mistake etc. cause, rather than leakage current, no longer requires accurate measurement leakage current and zero line current under this condition, but in time reports an emergency and asks for help or increased vigilance to make the maintenance personnel in time handle this type of trouble.
Further, the special chip includes a residual current measuring circuit 205 connected to a peripheral circuit of the special chip, and the residual current measuring circuit 205 is configured to output the residual current sampled by the resistor to the gain and phase correction circuit, so that the phase correction circuit performs gain and phase correction on the residual current and outputs the residual current to the residual current effective value calculating circuit 210.
It should be noted that the internal circuit of the special chip includes a residual current measuring circuit 205 connected to the residual current coil 201 for receiving the residual current sampled by the residual current coil 201 and outputting waveform data to the gain and phase correction circuit, so that the gain and phase correction circuit performs gain and phase correction on the waveform data.
Further, the special chip includes a residual current effective value calculating circuit 210, connected to the gain and phase correcting circuit, for receiving the residual current output by the gain and phase correcting circuit and performing a squaring or root-opening operation on the residual current.
It should be noted that, in the internal circuit of the special chip, the gain and phase correction circuit is connected with a residual current effective value calculation circuit 210, and the circuit can receive the waveform data output from the gain and phase correction circuit, and perform squaring on the waveform data, and obtain a digital sine wave signal by sampling, and after squaring the sine wave signal, the direct current and the double frequency are obtained, and after averaging or filtering, the double frequency is eliminated, only the direct current remains, and then the residual current effective value can be obtained by opening the direct current.
Furthermore, the special chip comprises a zero line current instantaneous sampling calculation circuit 207, which is connected with the gain and phase correction circuit and used for receiving the residual current output by the gain and phase correction circuit, wherein the live wire current and the residual current are vectors, and the zero line current instantaneous value is obtained by subtracting the residual current from the live wire current vector.
It should be noted that, the gain and phase correction circuit is further connected to a zero line current instantaneous sampling calculation circuit 207, which is capable of receiving waveform data output from the gain and phase correction circuit and subtracting a residual current vector from a live line current vector to obtain a zero line current instantaneous value.
Furthermore, the special chip further comprises a zero line current effective value calculating circuit 211, which is connected to the zero line current instantaneous sampling calculating circuit 207 and is configured to receive the zero line current instantaneous value output by the zero line current instantaneous sampling calculating circuit 207 and calculate the zero line current instantaneous value to obtain the zero line current effective value.
The zero-line current instantaneous sampling calculation circuit 207 is connected to a zero-line current effective value calculation circuit 211, and the zero-line current effective value is obtained by performing operation such as squaring and root opening on the zero-line current instantaneous value output by the zero-line current instantaneous sampling calculation circuit 207.
Further, the peripheral circuit of the special chip comprises a live wire current sampling coil 202 connected with the special chip for sampling live wire current.
It should be noted that the peripheral circuit of the special chip includes a live wire current sampling coil 202, which is used for sampling live wire current, and the sampled live wire current is output to the inside of the special chip for operation to obtain live wire power and electric energy.
Furthermore, the material of the live current sampling coil 202 is manganin.
It should be noted that the live current sampling coil 202 may be made of a manganin material.
Further, the dedicated chip includes a live line measurement circuit 206 connected to the live line current sampling coil 202 for calibration with the live line current.
It should be noted that the fire wire measuring circuit 206 is disposed inside the special chip, connected to the fire wire current sampling coil 202, and configured to receive the fire wire current output by the fire wire current sampling coil 202, and perform gain and phase correction on the fire wire current to obtain a corrected real-time waveform, where the typical waveform is a 50Hz sine wave. One path of the real-time waveform is output to a zero line current instantaneous sampling circuit, the other path of the real-time waveform is output to a live wire current effective value calculating circuit 208, and the other path of the real-time waveform is output to a live wire power calculating circuit 209. The live wire current effective value calculation circuit 208 performs square and root-opening calculation on the real-time waveform to obtain a live wire current effective value. The live wire power calculation circuit 209 multiplies the real-time waveform by the voltage instantaneous value, and then obtains the live wire power and the electric energy through operations such as averaging, integration and the like. The power calculation method comprises the following steps: the instantaneous value of voltage is multiplied by the instantaneous value of current (two sine waves are multiplied) to obtain DC quantity (power) and double frequency, the double frequency is averaged or filtered, then the obtained DC quantity is power, and the power is integrated to obtain electric energy.
Further, the dedicated chip peripheral circuit includes a resistance voltage-dividing circuit 203 connected to the dedicated chip for reducing the voltage sine wave signal to a weak signal.
The peripheral circuit of the dedicated chip is provided with a resistance voltage divider circuit 203, which is connected to the dedicated chip and is used to reduce a voltage sine wave signal having a typical value of 220V to a weak signal of about 200mV, and the sampled weak signal is output to the voltage measurement circuit 204.
Further, the dedicated chip further includes a voltage measurement circuit 204 connected to the resistance voltage division circuit 203 for correcting the weak signal.
The voltage measurement circuit 204 obtains a corrected real-time voltage waveform, which is also a 50Hz sine wave, by performing gain and phase correction on the received weak signal. One of the real-time waveforms is output to the live wire power calculation circuit 209, one is output to the zero wire power calculation circuit 212, and the other is output to the voltage effective value calculation circuit 213. The zero line power calculating circuit 212 is configured to multiply an instantaneous value of the zero line current by an instantaneous value of the voltage, and then obtain the zero line power and the electric energy through operations such as averaging and integrating.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. An electrical leakage detection apparatus, comprising:
residual current coil, special chip peripheral circuit and special chip;
the residual current coil and the peripheral circuit of the special chip are both connected with the special chip, the special chip is used for separating the instantaneous value of the zero line current from the residual current, and the residual current coil is used for measuring and obtaining the zero line current and the residual current.
2. The device as claimed in claim 1, wherein the asic includes a residual current measuring circuit connected to the asic peripheral circuit, and the residual current measuring circuit is configured to output the residual current sampled by the resistor to the gain and phase correction circuit, so that the phase correction circuit performs gain and phase correction on the residual current and outputs the corrected residual current to the residual current effective value calculating circuit.
3. The device according to claim 2, wherein the dedicated chip comprises a residual current effective value calculating circuit, connected to the gain and phase correcting circuit, for receiving the residual current outputted from the gain and phase correcting circuit and performing a squaring or root-opening operation on the residual current.
4. The device according to claim 2, wherein said dedicated chip comprises a zero line current instantaneous sampling calculation circuit, connected to said gain and phase correction circuit, for receiving a residual current outputted from said gain and phase correction circuit, and subtracting said residual current from a live line current vector to obtain a zero line current instantaneous value.
5. The electrical leakage detecting device according to claim 4, wherein said special chip further comprises a zero line current effective value calculating circuit, connected to said zero line current instantaneous sampling calculating circuit, for receiving the zero line current instantaneous value outputted from said zero line current instantaneous sampling calculating circuit, and calculating said zero line current instantaneous value to obtain the zero line current effective value.
6. The electrical leakage detection device of claim 1, wherein said dedicated chip peripheral circuit comprises a live current sampling coil connected to said dedicated chip for sampling live current.
7. An electrical leakage detection device according to claim 6, wherein said live current sampling coil is made of manganin.
8. A leakage detection device according to claim 6, wherein said dedicated chip comprises a live line measurement circuit connected to said live line current sampling coil for calibration with said live line current.
9. The electrical leakage detection device as claimed in claim 1, wherein said dedicated chip peripheral circuit comprises a resistor divider circuit connected to said dedicated chip for reducing the voltage sine wave signal to a weak signal.
10. The electrical leakage detection device of claim 9, wherein said dedicated chip further comprises a voltage measurement circuit connected to said resistance voltage divider circuit for correcting said weak signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911380611.2A CN111007436A (en) | 2019-12-27 | 2019-12-27 | Electric leakage detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911380611.2A CN111007436A (en) | 2019-12-27 | 2019-12-27 | Electric leakage detection device |
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| CN111007436A true CN111007436A (en) | 2020-04-14 |
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| CN201911380611.2A Pending CN111007436A (en) | 2019-12-27 | 2019-12-27 | Electric leakage detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2921840Y (en) * | 2006-04-03 | 2007-07-11 | 杭州华隆电子技术有限公司 | Single-phase antistealing electricity electric energy meter |
| CN101872957A (en) * | 2009-04-27 | 2010-10-27 | 黄华道 | Leakage current detection protection circuit |
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