阅读说明：本技术 一种非接触式用电检测装置及其检测方法 (Non-contact electricity utilization detection device and detection method thereof ) 是由 朱亚军 李伟 王�锋 吴喜兵 于 2021-08-05 设计创作，主要内容包括：本发明提供一种非接触式用电检测装置及其检测方法,该装置包括壳体,PCB板以及非接触式用电检测电路,非接触式用电检测电路包括电能计量电路、数据处理模块、数显模块,将非接触式用电检测装置设置在用电设备的待测线路旁边,通过非接触式用电检测电路产生标准信号源,电能计量电路的信号输出端与数据处理模块的信号输入端连接,用于将采集到的交流信号输出至数据处理模块,数据处理模块对获取到的交流信号进行信号采集、信号转换以及信号处理后,输出至数显模块进行数值显示。本发明的方法应用于上述的装置。本发明无需接触被测试导线即可测量交流电压、电流和频率,可以将采集信号进行数字化传输,精度高,量程范围宽,便于电网建设和维护。(The invention provides a non-contact electricity consumption detection device and a detection method thereof, the device comprises a shell, a PCB and a non-contact electricity consumption detection circuit, the non-contact electricity consumption detection circuit comprises an electric energy metering circuit, a data processing module and a digital display module, the non-contact electricity consumption detection device is arranged beside a line to be detected of electric equipment, a standard signal source is generated through the non-contact electricity consumption detection circuit, the signal output end of the electric energy metering circuit is connected with the signal input end of the data processing module and used for outputting collected alternating current signals to the data processing module, and the data processing module outputs the obtained alternating current signals to the digital display module for numerical value display after signal collection, signal conversion and signal processing. The method of the present invention is applied to the above-described apparatus. The invention can measure alternating voltage, current and frequency without contacting with a tested wire, can carry out digital transmission on the acquired signal, has high precision and wide range of measurement, and is convenient for power grid construction and maintenance.)

1. A non-contact electricity consumption detection device, comprising:

the casing, set up in PCB board in the casing and locate non-contact power consumption detection circuitry on the PCB board, non-contact power consumption detection circuitry includes electric energy measurement circuit, data processing module, digital display module, will non-contact power consumption detection device sets up the circuit next door that awaits measuring at the consumer, through non-contact power consumption detection circuitry produces standard signal source, the signal output part of electric energy measurement circuit with data processing module's signal input part is connected for the alternating current signal who will gather exports to data processing module, data processing module carries out signal acquisition, signal conversion and signal processing back to the alternating current signal who acquires, exports to digital display module carries out numerical value display.

2. The non-contact electricity usage detection apparatus according to claim 1, characterized in that:

the electric energy metering circuit comprises a current metering device and a non-contact voltage metering device, the current metering device is connected with a line to be measured through a current clamp meter and used for collecting alternating current, and the non-contact voltage metering device is connected with the line to be measured through the current clamp meter and used for collecting alternating voltage.

3. The non-contact electrical detection device of claim 2, wherein:

after the non-contact electricity utilization detection circuit generates a standard signal source, an alternating current signal of a line to be detected is acquired through an electric field sensor of the voltage clamp meter.

4. The non-contact electrical detection device of claim 3, wherein:

the electric field sensor comprises two semicircular shell type electrodes and a measuring capacitor arranged in a cavity formed by the two semicircular shell types, and two polar plates of the measuring capacitor are respectively connected with the two semicircular shell type electrodes.

5. The non-contact electrical detection device of claim 2, wherein:

the non-contact voltage metering device comprises a first voltage source, a second voltage source, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5 and an amplifier U1, wherein the first voltage source is a 50hz signal source for power grid transmission, the second voltage source is used for generating a standard signal source, the capacitor C2 is electrically connected with the capacitor C3, the capacitor C3 is electrically connected with the resistor R1, the resistor R1 is electrically connected with the capacitor C5, and two ends of the capacitor C5 are electrically connected with two input ends of the amplifier U1.

6. The non-contact electricity usage detection apparatus according to any one of claims 1 to 5, characterized in that:

the non-contact electricity utilization detection circuit further comprises a power supply module, an audible and visual alarm module, an operation indication unit and an interface module, wherein the power supply module, the audible and visual alarm module, the operation indication unit and the interface module are respectively and electrically connected with the data processing module.

7. A method for detecting a non-contact electricity consumption detecting device, wherein the non-contact electricity consumption detecting device is the non-contact electricity consumption detecting device according to any one of claims 1 to 6, the method comprising:

the method comprises the steps of providing a signal source V1 and a standard signal source V2 for power grid transmission, arranging a non-contact power utilization detection device beside a line to be detected of power equipment, generating a standard signal source V2 through a non-contact power utilization detection circuit, coupling the generated standard signal source V2 to a cable circuit, collecting alternating current signals in real time through an electric energy metering circuit, accurately detecting and measuring alternating current voltage, current, phase and frequency through a data processing module, and displaying numerical values through a digital display module.

8. The method of claim 7, wherein:

the non-contact voltage metering device of the electric energy metering circuit comprises a first voltage source, a second voltage source, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5 and an amplifier U1, wherein the first voltage source is a 50hz signal source V1 transmitted by a power grid, the second voltage source is used for generating a standard signal source V2, the capacitors C2 and C3 are equivalent capacitors of the power grid, the capacitor C5 is a capacitor to be measured, and a signal output by the amplifier U1 is a power grid signal V1+ V2 standard source signal.

9. The method of claim 8, wherein:

by using the superposition theorem of the linear circuit, the amplitude of the measured capacitor C5 is obtained for the first power grid loopAt this time, the voltammetry relationship was obtainedDeriving the current I from kirchhoff's law of voltage₀Expressed as formula (1):

substituting formula (1) to obtain formula (2):

amplitude of final measured capacitance C5Expressed as formula (3):

wherein J isw is the angular frequency.

10. The method of claim 9, wherein:

and (3) solving the amplitude of the measured capacitor C5 for the second power grid loop by using the superposition theorem of the linear circuit to establish a formula (4):

substituting formula (4) for formula (3) yields formula (5):

after simplifying equation (5), equation (6) is obtained:

according to the formula (6), the relation between the measured amplitude of the measured capacitor C5 being 50HZ, the measured amplitude of the standard source and the amplitude of the standard source can be obtained, and therefore the power grid signal source V1 is calculated.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a non-contact electricity utilization detection device and a detection method using the same.

Background

Various devices are widely applied to an electric power system, and after the connected devices are installed or overhauled, power failure, namely, inspection of live wiring and before electrification, is required. The method has the problems that the conventional power failure wiring inspection method needs to disconnect the secondary wiring, the disconnected secondary wiring needs to be reconnected after the inspection is finished, open-circuit operation of a secondary circuit of the current transformer can be caused in case of incorrect connection or forgetting of connection of the secondary wiring, the personal equipment safety is seriously damaged, and the workload of disconnecting and recovering the wiring is large, so that the working efficiency is influenced; especially, whether high-voltage equipment is electrified directly influences the personal safety of operators, in order to prevent a series of safety problems caused by misoperation of the operators, the power system strictly requires accurate detection of the high-voltage electrification condition, and electricity utilization inspection plays an extremely important role in safety production of the power industry.

Secondly, in some work situations, because there are no exposed test points, the equipment needs to be powered off during measurement, which will cause a short stop of the system, which is not allowed in many industrial fields.

Finally, after the test is finished, the damaged insulating layer needs to be repaired, and if the repair is not firm, the problems of short circuit and the like are easily caused.

Disclosure of Invention

The invention mainly aims to provide a non-contact power utilization detection device which can carry out digital transmission on acquired signals, has high precision and wide range of measurement and is convenient for power grid construction and maintenance.

The invention also aims to provide a detection method of the non-contact electricity utilization detection device, which can carry out digital transmission on the acquired signals, has high precision and wide range of measurement and is convenient for power grid construction and maintenance.

In order to achieve the above-mentioned primary object, the present invention provides a non-contact electricity detection device, which comprises a shell, a PCB arranged in the shell and a non-contact electricity utilization detection circuit arranged on the PCB, the non-contact electricity utilization detection circuit comprises an electric energy metering circuit, a data processing module and a digital display module, the non-contact electricity utilization detection device is arranged beside a line to be detected of the electric equipment, the non-contact electricity utilization detection circuit generates a standard signal source, the signal output end of the electric energy metering circuit is connected with the signal input end of the data processing module, the data processing module is used for outputting the acquired alternating current signals to the data processing module, and the data processing module is used for outputting the acquired alternating current signals to the digital display module for numerical value display after signal acquisition, signal conversion and signal processing.

In a further scheme, the electric energy metering circuit comprises a current metering device and a non-contact voltage metering device, the current metering device is connected with a line to be tested through a current clamp meter and used for collecting alternating current, and the non-contact voltage metering device is connected with the line to be tested through the current clamp meter and used for collecting alternating voltage.

In a further scheme, after the non-contact electricity utilization detection circuit generates a standard signal source, an alternating current signal of a line to be detected is acquired through an electric field sensor of the voltage clamp meter.

In a further scheme, the electric field sensor comprises two semicircular shell type electrodes and a measuring capacitor arranged in a cavity formed by the two semicircular shell types, and two polar plates of the measuring capacitor are respectively connected with the two semicircular shell type electrodes.

In a further aspect, the non-contact voltage metering device includes a first voltage source, a second voltage source, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5, and an amplifier U1, where the first voltage source is a 50hz signal source for power grid transmission, the second voltage source is used to generate a standard signal source, the capacitor C2 is electrically connected to the capacitor C3, the capacitor C3 is electrically connected to the resistor R1, the resistor R1 is electrically connected to the capacitor C5, and two ends of the capacitor C5 are electrically connected to two input ends of the amplifier U1.

In a further scheme, the non-contact electricity consumption detection circuit further comprises a power module, an audible and visual alarm module, an operation indication unit and an interface module, wherein the power module, the audible and visual alarm module, the operation indication unit and the interface module are respectively and electrically connected with the data processing module.

In order to achieve another object, the present invention provides a method for detecting a non-contact electricity consumption detecting device, where the non-contact electricity consumption detecting device is used, the method including: the method comprises the steps of providing a signal source V1 and a standard signal source V2 for power grid transmission, arranging a non-contact power utilization detection device beside a line to be detected of power equipment, generating a standard signal source V2 through a non-contact power utilization detection circuit, coupling the generated standard signal source V2 to a cable circuit, collecting alternating current signals in real time through an electric energy metering circuit, accurately detecting and measuring alternating current voltage, current, phase and frequency through a data processing module, and displaying numerical values through a digital display module.

The non-contact voltage metering device of the electric energy metering circuit comprises a first voltage source, a second voltage source, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5 and an amplifier U1, wherein the first voltage source is a 50hz signal source V1 transmitted by an electric network, the second voltage source is used for generating a standard signal source V2, the capacitors C2 and C3 are equivalent capacitors of the electric network, the capacitor C5 is a capacitor to be measured, and a signal output by the amplifier U1 is an electric network signal V1+ V2 standard source signal.

Further, the amplitude of the measured capacitor C5 is obtained from the first power grid loop by using the superposition theorem of the linear circuitAt this time, the voltammetry relationship was obtainedDeriving the current I from kirchhoff's law of voltage₀Expressed as formula (1):

substituting formula (1) to obtain formula (2):

amplitude of final measured capacitance C5Expressed as formula (3):

wherein J isw is the angular frequency.

Further, the amplitude of the measured capacitor C5 is obtained for the second grid loop by using the superposition theorem of the linear circuit, and equation (4) is established:

substituting formula (4) for formula (3) yields formula (5):

after simplifying equation (5), equation (6) is obtained:

according to the formula (6), the relation between the measured amplitude of the measured capacitor C5 being 50HZ, the measured amplitude of the standard source and the amplitude of the standard source can be obtained, and therefore the power grid signal source V1 is calculated.

Therefore, the unknown alternating voltage can be accurately obtained by injecting a known standard signal source, the alternating/direct voltage and the phase can be measured by using the attached test clamp, and the alternating voltage, the current and the frequency can be measured without contacting a tested wire.

The invention therefore allows an electrician or technician performing the test to measure the voltage source more safely, by measuring the voltage through the insulation of the cable, reducing the risk of the user touching the metallic conductor and reducing the possibility of erroneous or accidental contact with the wrong conductor. The unknown alternating voltage is accurately obtained by injecting a known standard signal source, and compared with a traditional non-contact voltage detector only inducing a magnetic field, the technology can measure the actual alternating voltage. Traditionally, metal-to-metal connections are required when using test leads to probe or connect alligator clips to a circuit.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a non-contact electricity consumption detection device according to the present invention.

Fig. 2 is a schematic diagram of an embodiment of a non-contact electricity consumption detection device according to the present invention.

FIG. 3 is a schematic circuit diagram of a non-contact voltage testing apparatus in an embodiment of the non-contact electricity consumption detecting apparatus according to the present invention.

Fig. 4 is a schematic diagram of a first power grid loop in an embodiment of a non-contact electricity consumption detection apparatus of the present invention.

Fig. 5 is a schematic diagram of a second power network loop in an embodiment of a non-contact electricity consumption detection apparatus of the present invention.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

A non-contact electricity utilization detection device embodiment:

referring to fig. 1 and 2, a non-contact electricity consumption detection device 1 according to the present invention includes a housing, a PCB disposed in the housing, and a non-contact electricity consumption detection circuit disposed on the PCB, where the non-contact electricity consumption detection circuit includes an electric energy metering circuit 10, a data processing module 20, and a digital display module 30, the non-contact electricity consumption detection device is disposed beside a line to be detected of an electric device, a standard signal source is generated by the non-contact electricity consumption detection circuit, a signal output end of the electric energy metering circuit 10 is connected with a signal input end of the data processing module 20, and is configured to output an acquired ac signal to the data processing module 20, and the data processing module 20 performs signal acquisition, signal conversion, and signal processing on the acquired ac signal, and then outputs the acquired ac signal to the digital display module 30 for numerical display.

In this embodiment, the electric energy metering circuit 10 includes a current metering device and a non-contact voltage metering device, the current metering device is connected to the line to be measured through a current clamp meter for collecting ac current, and the non-contact voltage metering device is connected to the line to be measured through a voltage clamp meter for collecting ac voltage.

After a standard signal source is generated through the non-contact electricity utilization detection circuit, an alternating current signal of a line to be detected is acquired through an electric field sensor of the voltage clamp meter.

In this embodiment, the electric field sensor includes two semicircular shell type electrodes and a measuring capacitor disposed in a cavity formed by the two semicircular shell types, and two electrode plates of the measuring capacitor are respectively connected to the two semicircular shell type electrodes.

Therefore, the invention can carry out measurement only by clamping one wire by using the voltage clamp, can provide convenient and accurate voltage measurement, and does not need to be in current contact with a circuit to be measured. The voltage and current can be measured and displayed simultaneously through the jaws without the need for test wires or bare wires, rather than simply having electrical/non-electrical detection. Need not to open the panel or dismantle binding nut, can effectively accelerate failure diagnosis, very big liberation engineer's both hands make work safer.

In this embodiment, as shown in fig. 3, the non-contact voltage metering device includes a first voltage source V1, a second voltage source V2, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5, and an amplifier U1, where the first voltage source V1 is a 50hz signal source for grid transmission, the second voltage source V2 is used to generate a standard signal source, the capacitor C2 is electrically connected to the capacitor C3, the capacitor C3 is electrically connected to the resistor R1, the resistor R1 is electrically connected to the capacitor C5, and two ends of the capacitor C5 are electrically connected to two input terminals of the amplifier U1.

In this embodiment, the non-contact electricity consumption detection circuit further includes a power module 40, an audible and visual alarm module 50, an operation indication unit 70, and an interface module 50, wherein the power module 40, the audible and visual alarm module 50, the operation indication unit 70, and the interface module 50 are electrically connected to the data processing module 20, respectively.

Therefore, the invention has simple structure and safer detection, and can realize measurement without damaging the insulating layer of the line to be measured.

The non-contact electricity detection device comprises a data processing module 20, an audible and visual alarm module 50, a digital display module 30, a power supply module 40, an operation indication unit 70, a current measurement device and a non-contact voltage test device, wherein a standard signal source sent out from the inside of the instrument is coupled to the periphery of a 50HZ power transmission line through a grounding ground, an alternating current signal of a line to be detected is obtained through an electric field sensor of a voltage clamp meter, the alternating current signal is processed and enters the data processing module 20, and a high-speed AD sampling module is adopted in the data processing module 20 and noise reduction is carried out at the same time, so that data acquisition and conversion are quicker and more accurate; and timely backing up the acquired information. Outputting the processed data to a display; the electric field sensor comprises two semicircular shell type electrodes and a measuring capacitor arranged in a cavity formed by the two semicircular shell types, two polar plates of the measuring capacitor are respectively connected with the semicircular shell type electrodes, the measuring capacitor is coupled to a 50HZ cable through injecting a known standard signal source, then the measuring alternating voltage, the current, the phase and the frequency are accurately detected through signal processing, and finally, data obtained through the data processing module 20 are displayed.

Therefore, the invention does not need to contact the test point, the alternating voltage and the current can be simultaneously measured, and convenient and accurate voltage measurement can be provided without contacting the voltage and the current of the tested circuit. And only single-line measurement is needed, the installation operation is simple and convenient, and potential high-voltage operation risks can be further isolated. Thereby saving time, minimizing potential errors, and greatly reducing the possibility of arcing. The open jaw can be used for dealing with narrow measurement space or dense flat cable measurement, and is favorable for large-area popularization and use.

The embodiment of a detection method of a non-contact electricity detection device comprises the following steps:

the invention provides a detection method of a non-contact electricity detection device, wherein the non-contact electricity detection device adopts the non-contact electricity detection device 1, and the method comprises the following steps:

the method comprises the steps of providing a signal source V1 and a standard signal source V2 for power grid transmission, arranging a non-contact power utilization detection device beside a line to be detected of power equipment, generating a standard signal source V2 through a non-contact power utilization detection circuit, coupling the generated standard signal source V2 to a cable circuit, collecting alternating current signals in real time through an electric energy metering circuit 10, accurately detecting and measuring alternating current voltage, current, phase and frequency through a data processing module 20, and displaying numerical values through a digital display module 30.

In this embodiment, the non-contact voltage metering device of the electric energy metering circuit 10 includes a first voltage source V1, a second voltage source V2, a capacitor C2, a capacitor C3, a resistor R1, a capacitor C5, and an amplifier U1, where the first voltage source V1 is a 50hz signal source V1 transmitted by a power grid, the second voltage source V2 is used to generate a standard signal source V2, the capacitors C2 and C3 are equivalent capacitors of the power grid, the capacitor C5 is a capacitor to be measured, and a signal output by the amplifier U1 is a power grid signal V1+ V2 standard source signal.

In this embodiment, as shown in fig. 4, by using the superposition theorem of linear circuits, for a linear system, the multi-source network can be separately and independently calculated, the circuit of fig. 3 is equivalently converted into the first grid loop of fig. 4, and the signal source V1 and the loop current I are used₀The amplitude of the measured capacitance C5 is obtained for the first power grid loopAt this time, it is obtained by voltammetric relationshipDeriving the current I from kirchhoff's law of voltage₀Expressed as formula (1):

substituting formula (1) to obtain formula (2):

amplitude of final measured capacitance C5Expressed as formula (3):

wherein J isw is the angular frequency.

As shown in fig. 5, the circuit of fig. 3 is equivalently transformed into the second network loop of fig. 5 by using the superposition theorem of linear circuits, and using the signal source V2 and the loop current I₀The amplitude of the measured capacitor C5 is obtained for the second grid loop, that is, formula (4) is established:

substituting formula (4) for formula (3) yields formula (5):

after simplifying equation (5), equation (6) is obtained:

at this time, knowing that V2 is the standard signal source emitted by the instrument itself, the relationship between the measured amplitude of the measured capacitance C5 as 50HZ measured amplitude, the measured amplitude of the standard source and the amplitude of the standard source itself can be obtained according to equation (6).

Therefore, the unknown alternating voltage can be accurately obtained by injecting a known standard signal source, the alternating/direct voltage and the phase can be measured by using the attached test clamp, and the alternating voltage, the current and the frequency can be measured without contacting a tested wire.

The invention therefore allows an electrician or technician performing the test to measure the voltage source more safely, by measuring the voltage through the insulation of the cable, reducing the risk of the user touching the metallic conductor and reducing the possibility of erroneous or accidental contact with the wrong conductor. The unknown alternating voltage is accurately obtained by injecting a known standard signal source, and compared with a traditional non-contact voltage detector only inducing a magnetic field, the technology can measure the actual alternating voltage. Traditionally, metal-to-metal connections are required when using test leads to probe or connect alligator clips to a circuit.

It should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. Although the invention has been described herein with reference to a number of illustrative examples thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, other uses will be apparent to those skilled in the art in view of variations and modifications in the subject matter incorporating the components and/or arrangement of the arrangement within the scope of the disclosure, drawings and claims hereof.