Intelligent electric energy meter electric variable monitoring electric terminal and electricity larceny prevention method thereof

Abstract

The application discloses an electric variable monitoring electric terminal of a smart electric energy meter and an electricity larceny prevention method thereof, relates to the field of electric variable monitoring devices, and comprises a terminal body, one end of the terminal body is provided with a blind hole for installing a wiring in a radial direction, the terminal body is provided with a mounting hole which is not parallel to the blind hole, the terminal body is provided with a mounting groove which is placed opposite to the mounting hole, and the mounting groove and the mounting hole are both communicated with the blind hole. An induction assembly comprises a coil wound around the outer circumferential side of the terminal body, and the coil is used for being connected with a PCB of the electric energy meter and generating an induced current. A piezoelectric assembly is installed in the mounting groove, and an electric power line is pressed on the piezoelectric assembly through a bolt to generate an electric signal, so as to judge whether the electric power line is stably installed. The application has the beneficial effects that the in-meter electricity larceny prevention function and the out-meter electricity larceny prevention function can be simultaneously monitored, faults are not prone to occurring, cost can be effectively controlled, and the design of the induction assembly and the piezoelectric assembly has better concealment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric variable monitoring device, in particular to an intelligent electric energy meter electric variable monitoring electric terminal and its electricity stealing prevention method. BACKGROUND

[0002] The existing electricity stealing prevention technology can be mainly divided into two kinds of outside meter electricity stealing prevention and inside meter electricity stealing prevention.

[0003] The outside meter electricity stealing prevention is mainly realized by using various uniquely designed anti-damage structural members to protect the electric energy meter through strong security devices, but the overall structure is generally large in size and weight (relative to the electric energy meter), which is not only high in cost and inconvenient to install, but also occupies a large installation position; in addition, the existing electricity stealing prevention means lacks the function of active reporting, even under the condition of convenient reporting of networked electric energy meter, large-scale manpower is still needed to find problems.

[0004] The inside meter electricity stealing prevention technology is mainly realized by measuring the difference between the zero line current and the fire line current, when the fire line current value measured by the electric energy meter has a large difference with the zero line current value, the electricity stealing event can be perceived and recorded, but it cannot identify the outside electricity stealing, secondly, since the mutual inductor is easily affected by the magnetic field change, a certain margin value is usually left for the difference between the zero line current and the fire line current to avoid the misjudgment of electricity stealing event caused by external magnetic field interference, therefore, the sensitivity of the existing inside meter electricity stealing prevention technology for electricity stealing perception is correspondingly disturbed; finally, this existing inside meter electricity stealing prevention technology can still avoid the disadvantage that the outside short circuit can be found at a glance during the patrol by means of short circuit in the electric energy meter, so it cannot directly identify whether electricity stealing occurs. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is that the existing electric terminal for electric variable monitoring has a complex structure and low structural sensitivity.

[0006] The above technical problem is solved by the following technical scheme: the present application provides an intelligent electric energy meter electric variable monitoring electric terminal, which comprises a terminal body, one end of the terminal body is provided with a blind hole for installing a wire in the radial direction, the terminal body is provided with a mounting hole which is not parallel to the blind hole, the terminal body is provided with a mounting groove which is placed opposite to the mounting hole, and the mounting groove and the mounting hole are both communicated with the blind hole.

[0007] An induction assembly, the induction assembly comprises a coil wound around the outer peripheral side of the terminal body, and the coil is used for connecting with the PCB board of the electric energy meter and generating an induced current.

[0008] The piezoelectric component is installed in the installation groove, and the power line is pressed on the piezoelectric component by a bolt to generate an electric signal, so as to determine whether the power line is stably installed.

[0009] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the piezoelectric component comprises a piezoelectric part arranged in the installation groove, and the piezoelectric part is used to convert the pressure of the power line and the bolt pressed on the piezoelectric part into an electric signal.

[0010] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the piezoelectric part comprises a piezoelectric ceramic and a high-voltage insulating ceramic connected with the piezoelectric ceramic.

[0011] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the piezoelectric component further comprises a conducting part arranged at one side end face of the piezoelectric part, and the conducting part penetrates through the terminal body and is used to be connected with a PCB of the electric energy meter; the terminal body further comprises a through hole communicated with the blind hole, and the conducting part cooperates with the through hole and penetrates out of the through hole.

[0012] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the conducting part comprises an antenna, and a ceramic protective sleeve wrapped outside the antenna.

[0013] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the sensing component further comprises a plurality of protection blocks slidably arranged on the terminal body, and the plurality of protection blocks are circumferentially distributed on the outer periphery side of the terminal body; the outer periphery side of the terminal body is provided with an annular groove slidably connected with the plurality of protection blocks.

[0014] In a preferred embodiment of the electric terminal for monitoring electric variables of a smart electric energy meter, the outer periphery side of the adjacent protection blocks is provided with a gap slot facilitating the coil to pass through and be wound.

[0015] The beneficial effects of the intelligent electric energy meter electric variable monitoring electric terminal of the application are that: the two values in the existing two-value comparison electricity stealing are compared through the measured current, and then the electricity stealing identification in the meter is more sensitive; the bolt can press the power line on the piezoelectric component to generate an electric signal through the relatively arranged mounting hole and mounting groove, and whether the power line is stably connected is judged by whether the electric signal exists; when the terminal body is normally used, the anti-electricity stealing function in the meter and the anti-electricity stealing function outside the meter can be monitored at the same time, especially the electricity stealing behavior of zero users can be effectively identified, the structure is simple, and faults are not easy to occur; meanwhile, compared with the traditional anti-electricity stealing technology, the design of the induction component and the piezoelectric component has better concealment, and the anti-electricity stealing safety is greatly improved; and the induction component and the piezoelectric component have simple structures, are convenient to manufacture, and can effectively control the cost.

[0016] Another object of the application is to provide an anti-electricity stealing method of an intelligent electric energy meter electric variable monitoring electric terminal, which aims to solve the problems of complex electric terminal electric variable monitoring structure and insensitive monitoring.

[0017] To solve the above technical problems, the application also provides the following technical solutions: an anti-electricity stealing method of an intelligent electric energy meter electric variable monitoring electric terminal; specifically including an anti-electricity stealing method in the meter and an anti-electricity stealing method outside the meter.

[0018] As a preferred scheme of the cutting clamp, the anti-electricity stealing method in the meter includes the following steps:

[0019] S1: connect the induction component to the PCB board of the intelligent electric energy meter, and start the electric energy meter for use;

[0020] S2: when the electric energy meter is in a normal working state, the terminal body is electrified, and the current induced in the coil wound outside the terminal body is positively correlated with the current in the terminal body;

[0021] S3: compare the current value induced in the coil with the fire wire current value measured in the electric energy meter, and compare the fire wire current value measured in the electric energy meter with the zero wire current value measured in the electric energy meter; when the error values of the two comparisons are greater than 20%, it is judged that electricity stealing occurs.

[0022] As a preferred scheme of the cutting clamp, the anti-electricity stealing method outside the meter includes the following steps:

[0023] S1: install the piezoelectric component in the mounting groove, and press the pressure line on the piezoelectric component through the bolt, and connect the electric energy meter for normal use;

[0024] S2: during the normal electrification process of the electric energy meter, the voltage signal generated by the piezoelectric component is continuously output, and the user can monitor the electric signal value output by the piezoelectric component.

[0025] S3: If the output voltage signal is large, the power line connection state is normal; if the output voltage signal is small, the power line connection is not firm; if the output voltage signal is none, the power line has loosened or fallen off, prompting the staff to re-access the power connection;

[0026] S4: Compare the monitored voltage data with the historical power consumption data, exclude the influence of seasonal factors on power consumption, and compare the power consumption in adjacent time periods in units of weeks or months, when the comparison result shows a small difference, trigger a warning; if the difference is significant, upgrade the warning to a suspected electricity theft event and report it for processing.

[0027] The beneficial effects of the present application are that the accurate detection of the electric energy meter is realized by the in-table electricity theft prevention and the out-table electricity theft prevention, and the structure is simple and has good concealment. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to make the technical solutions of the embodiments of the present application clearer, the drawings of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application.

[0029] Figure 1 The overall structure of the electric terminal of the electric variable monitoring of the intelligent electric energy meter of the present application is shown in the schematic diagram;

[0030] Figure 2 The structure of the terminal body in the electric terminal of the electric variable monitoring of the intelligent electric energy meter of the present application is shown in the schematic diagram Figure 1 ;

[0031] Figure 3 The structure of the terminal body in the electric terminal of the electric variable monitoring of the intelligent electric energy meter of the present application is shown in the schematic diagram Figure 2 ;

[0032] Figure 4 The structure of the piezoelectric assembly in the electric terminal of the electric variable monitoring of the intelligent electric energy meter of the present application is shown in the schematic diagram.

[0033] In the figure: 1, terminal body; 11, blind hole; 12, mounting hole; 13, mounting groove; 14, through hole; 15, ring groove; 2, induction assembly; 21, coil; 22, protection block; 3, piezoelectric assembly; 31, piezoelectric part; 311, piezoelectric ceramic; 312, high-voltage insulating ceramic; 32, conduction part; 321, antenna; 322, ceramic protection sleeve. DETAILED DESCRIPTION

[0034] In order to make the skilled in the art better understand the present application, the present application will be further described in detail below in combination with specific embodiments and drawings.

[0035] The terms used in the present application are those general terms currently widely used in the art in consideration of the functions regarding the present application, but the terms can be changed according to the intention of those of ordinary skill in the art, precedents, or new technology in the art. Also, specific terms can be selected by the applicant, and in this case, the detailed meanings thereof will be described in the detailed description of the present application. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present application.

[0036] Referring to Figure 1 The embodiment provides an intelligent electric energy meter electric variable monitoring electric terminal, which comprises a terminal body 1, an induction assembly 2 and a piezoelectric assembly 3.

[0037] Specifically, one end of the terminal body 1 is provided with a blind hole 11 for installing a wiring in the radial direction, the terminal body 1 is provided with a mounting hole 12 which is not parallel to the blind hole 11, the terminal body 1 is provided with a mounting groove 13 which is placed opposite to the mounting hole 12, and the mounting groove 13 and the mounting hole 12 are both communicated with the blind hole 11; it is a prior art to install the power line on the terminal body 1 for power measurement, that is, the power line is fitted into the blind hole 11, the bolt passes through the mounting hole 12 and presses the power line to the mounting groove 13, thereby realizing the installation of the power line on the terminal body 1.

[0038] The induction assembly 2 comprises a coil 21 wound around the outer circumferential side of the terminal body 1, and the coil 21 is used to be connected with the PCB of the electric energy meter and generate an induced current; in the normal operation state of the electric energy meter, the terminal body 1 normally operates to enable the coil 21 to generate an induced current inside, the induced current is introduced into the connected PCB of the electric energy meter, the current value induced in the coil 21 is compared with the fire line current value measured in the electric energy meter itself, and at the same time, the fire line current value measured in the electric energy meter itself is compared with the zero line current value measured in the electric energy meter itself, when the error values of the two comparisons are both greater than 20%, it is judged that electricity stealing occurs. The existing two-value comparison method is to compare the fire line current value measured by the manganese copper of the electric energy meter with the zero line current value measured by the voltage transformer contained in the electric energy meter, when there is a large difference between the fire line current value and the zero line current value measured by the electric energy meter, the electricity stealing event can be perceived and recorded; the present application compares the induced current value generated in the coil 21 measured by the electric energy meter with the fire line current value and the zero line current value measured by the electric energy meter, and then judges, the judgment method is as follows:

[0039] The fire line current value in the coil 21 measured by the electric energy meter is X, the zero line current value collected by the current transformer is Y, and the fire line current value collected by the manganese copper is Z. X, Y and Z are corresponding values converted to the same unit A.

[0040] The conditions for judging electricity stealing events by ternary comparison are:

[0041] |X-Z|>N1 and |Y-Z|>N1, judging as in-table live line short-circuit electricity stealing event.

[0042] ||X-Z|-|Y-Z||>N2, judging as live line and zero line simultaneous short-circuit electricity stealing event.

[0043] In-table live line short-circuit electricity stealing event: the electricity stealer is to cross the live line and outgoing line of the electric energy meter to make the electric energy meter be short-circuited to realize in-table electricity stealing. The traditional electric energy meter sets the manganese copper resistance sampling at the connection between the electric terminal and the electric energy meter lead, and the short-circuit point of the live line short-circuit of the electric energy meter is located between the manganese copper resistance sampling and the electric terminal. When the live line short-circuit of the electric energy meter is performed, the manganese copper resistance sampling and other components of the electric energy meter are short-circuited, and the short-circuit line shunts most of the current. The live line current Z collected by the manganese copper resistance sampling is very small. At the same time, since the short-circuit point is located between the electric terminal and the manganese copper resistance sampling, when the live line short-circuit of the electric energy meter is performed, the electric terminal is connected to the circuit, and there is current passing through. Therefore, there is current in the electric energy meter measuring coil 21, and the live line current value X in the electric energy meter measuring coil 21 is much lower than the actual use value. At the same time, the zero line current Y is collected by the current transformer at the incoming and outgoing lines of the electric energy meter. Under normal power consumption conditions, the live line current Z of the manganese copper resistance sampling and the zero line current value Y should be consistent. When the difference between the live line current value X in the electric energy meter measuring coil 21 and the live line current Z collected by the manganese copper resistance sampling is greater than 20% of the actual measurement value, and the deviation between the live line current Z of the manganese copper resistance sampling and the zero line current value Y is also greater than 20% of the actual measurement value, it is judged as electricity stealing. According to the principle of greater than 20%, the value of N1 is 20% of the actual measurement value, i.e. the live line current value X in the electric energy meter measuring coil 21.

[0044] Live line and zero line simultaneous short-circuit electricity stealing event: under the working condition of live line and zero line incoming and outgoing lines being simultaneously short-circuited, i.e. the incoming and outgoing lines of the live line and the incoming and outgoing lines of the zero line are short-circuited together using a conductor, the current transformer is short-circuited and cannot function, and the measured zero line current Y is much lower than the actual power consumption current value. In this case, the difference between the live line current value X in the electric energy meter measuring coil 21 and the live line current Z collected by the manganese copper sampling, and the difference between the zero line current Y and the live line current Z collected by the manganese copper sampling are compared. When the difference between the two sets of differences is greater than 20%, it is judged that there is in-table zero and live line simultaneous short-circuit electricity stealing event. According to the principle of greater than 20%, the value of N2 is 20% of the actual measurement value, i.e. the live line current value X in the electric energy meter measuring coil 21.

[0045] The judgment of the connection quality of the electric energy meter can also be realized: in the actual use process, the connection quality of the on-site connection cannot be judged, and some bad connection of the electric power line can cause abnormal heating of the contact point, which can further cause fire or abnormal line loss rate. The anti-stealing electricity terminal provided by the application can obtain the pressure value of the piezoelectric part 31 of the electric energy meter, and when the pressure value is insufficient, it can be judged that the connection of the electric power line of the electric energy meter is abnormal.

[0046] The piezoelectric assembly 3 is installed in the mounting groove 13, and the electric power line is pressed on the piezoelectric assembly 3 by a bolt to generate an electric signal, so as to judge whether the electric power line is stably installed. The bolt can press the electric power line on the piezoelectric assembly 3 to generate an electric signal through the relatively arranged mounting hole 12 and mounting groove 13, and whether the electric power line is stably connected can be judged by the presence or absence of the electric signal. When the electric signal is absent, the electric power line is not firmly installed or loosened; when the electric signal is stably present, the electric power line is stably connected and does not need to be reinstalled and adjusted.

[0047] As an optional embodiment, the piezoelectric assembly 3 includes a piezoelectric part 31 arranged in the mounting groove 13, and the piezoelectric part 31 is used for converting the pressure of the electric power line and the bolt pressed on the piezoelectric part 31 into an electric signal. The piezoelectric part 31 can be any device capable of converting pressure into an electric signal, such as a pressure sensor, a piezoelectric ceramic plate, etc.

[0048] As shown in Figure 4 , the piezoelectric part 31 includes a piezoelectric ceramic 311 and a high-voltage insulating ceramic 312 connected with the piezoelectric ceramic 311. The piezoelectric ceramic 311 and the high-voltage insulating ceramic 312 are directly processed together or bonded together; the piezoelectric part 31 transmits signals to the outside for monitoring of the electric signal.

[0049] As shown in Figure 4 , the piezoelectric assembly 3 further includes a conducting part 32 arranged at one side end face of the piezoelectric part 31, and the conducting part 32 penetrates through the terminal body 1 and is used for connecting with the PCB board of the electric energy meter; the terminal body 1 further includes a through hole 14 in communication with the blind hole 11, and the conducting part 32 cooperates with the through hole 14 and penetrates out of the through hole 14. The through hole 14 and the blind hole 11 are oppositely arranged at two sides of the terminal body 1, and the electric signal generated by the piezoelectric part 31 can be directly transmitted to the electric energy meter through the arranged conducting part 32, so as to realize real-time monitoring of the electric signal.

[0050] Further, the conducting part 32 includes an antenna 321 and a ceramic protective sleeve 322 wrapped outside the antenna 321. The ceramic protective sleeve 322 is sleeved on the antenna 321, which can strengthen the rigidity of the antenna 321, so that the conducting part 32 is not easy to deform and can smoothly penetrate through the through hole 14.

[0051] As shown in Figure 1 - Figure 3As shown, the induction assembly 2 further comprises a plurality of protection blocks 22 slidingly arranged on the terminal body 1, which are circumferentially distributed on the outer periphery of the terminal body 1; and the outer periphery of the terminal body 1 is provided with an annular groove 15 in sliding connection with the plurality of protection blocks 22. By slidingly arranging the plurality of protection blocks 22 on the terminal body 1, the protection blocks 22 can be conveniently pressed against the coil 21 when winding the coil 21, and the coil 21 can be protected by the support of the plurality of protection blocks 22 when external parts are pressed; the distance between adjacent protection blocks 22 along the axial direction of the terminal body 1 is less than half the length of the annular groove 15, so that when external force is pressed against the wound coil 21, the external force is directly applied to the protection blocks 22, which bear the external force and protect the coil 21; the smaller the distance between adjacent protection blocks 22, the more protection blocks 22 can be arranged, the more support points can bear the external force, and the better the protection effect on the coil 21; the coil 21 itself is made of high-voltage-resistant protective grade material, and the coil 21 is wound in the annular groove 15, so that the height difference between the annular groove 15 and the outer peripheral surface of the terminal body 1 can also achieve pressure protection for the coil 21.

[0052] As shown in Figure 2 The outer periphery of adjacent protection blocks 22 is provided with a displacement slot for facilitating the coil 21 to pass through and be wound. By providing the displacement slot, a height difference is formed between the outer peripheral surface of the protection block 22 and the coil 21, further protecting the coil 21.

[0053] In summary, the induction assembly 2 and the piezoelectric assembly 3 are both installed on the terminal body 1, and the terminal body 1 is connected to the electric energy meter for normal use. The induction current generated in the coil 21 is introduced to the connected electric energy meter PCB, and the current of the measuring coil 21 is compared with the existing two values to compare the two values in the existing two-value electricity stealing, thereby making the meter electricity stealing identification more sensitive. The relatively arranged mounting hole 12 and mounting groove 13 can realize that the bolt compresses the power line on the piezoelectric assembly 3 to generate an electric signal, and whether the power line is stably connected is judged by the presence or absence of the electric signal. When the electric signal is not present, the power line is not firmly installed or loosened. When the electric signal is stably present, the power line is stably connected and does not need to be reinstalled and adjusted. When the terminal body 1 is normally used, the meter anti-theft electricity function and the meter anti-theft electricity function can be monitored at the same time, especially the electricity stealing behavior of zero users can be effectively identified, the structure is simple and not prone to failure; at the same time, compared with the traditional anti-theft electricity technology, the design of the induction assembly 2 and the piezoelectric assembly 3 in the present application has better concealment, and the safety of the anti-theft electricity function is greatly improved; and the induction assembly 2 and the piezoelectric assembly 3 have simple structure and are easy to manufacture, and can effectively control the cost.

[0054] Further, based on the above intelligent electric energy meter electric variable monitoring electric terminal, the embodiment provides a power stealing prevention method of the intelligent electric energy meter electric variable monitoring electric terminal, which includes an in-meter power stealing prevention method and an out-meter power stealing prevention method.

[0055] As an optional embodiment, the in-meter power stealing prevention method includes the following steps:

[0056] S1: connect the sensing assembly 2 to the PCB board of the intelligent electric energy meter, and start the electric energy meter for use;

[0057] S2: when the electric energy meter is in a normal working state, the terminal body 1 is powered on, and the current induced in the coil 21 wound outside the terminal body 1 is positively correlated with the current in the terminal body 1;

[0058] S3: compare the current value induced in the coil 21 with the firewire current value measured by the electric energy meter itself, and compare the firewire current value measured by the electric energy meter itself with the zero line current value measured by the electric energy meter itself, and if the error values of the two comparisons are both greater than 20%, it is determined that power stealing occurs.

[0059] As an optional embodiment, the out-meter power stealing prevention method includes the following steps:

[0060] S1: install the piezoelectric part 31 in the installation groove 13, and press the pressure wire on the piezoelectric assembly 3 through the bolt, and connect the electric energy meter for normal use;

[0061] S2: during the normal power-on process of the electric energy meter, the voltage signal generated by the piezoelectric part 31 is continuously output, and the user can monitor the electric signal value output by the piezoelectric part 31;

[0062] S3: if the output voltage signal is large, the power line connection state is normal; if the output voltage signal is small, the power line connection is not firm; if the output voltage signal is none, the power line has loosened or fallen off, prompting the staff to re-connect the power connection;

[0063] S4: compare the monitored voltage data with the historical power consumption data, exclude the influence of seasonal factors on power consumption, and compare the power consumption in adjacent time periods in units of weeks or months, trigger an early warning when the comparison result shows a small difference, and if the difference is significant, upgrade the early warning to a suspected power stealing event and report it for processing.

[0064] Finally, it should be pointed out that the above detailed description of the method and device is only an embodiment, and those skilled in the art can modify the embodiment in different ways without departing from the scope of the present application.

Claims

1. An electric terminal for monitoring electric variables of a smart meter, characterized in that: The utility model relates to an electric variable monitoring electric terminal of intelligent electric energy meter, and a method for preventing electricity larceny in and out of electric energy meter. The terminal body (1) is provided with a blind hole (11) for installing a wire at one end in the radial direction, and is provided with an installation hole (12) which is not parallel to the blind hole (11), and is provided with an installation slot (13) which is placed opposite to the installation hole (12) and is in communication with the blind hole (11). The induction assembly (2) includes a coil (21) wound around the outer circumferential side of the terminal body (1), which is used to connect with the PCB board of the electric energy meter and generate an induced current. The piezoelectric assembly (3) is installed in the installation slot (13) and generates an electric signal by pressing the power line against the piezoelectric assembly (3) through a bolt to determine whether the power line is stably installed.

2. The electric terminal for electric variable monitoring of an intelligent electric energy meter according to claim 1, characterized in that: The piezoelectric assembly (3) includes a piezoelectric part (31) arranged in the installation slot (13), which is used to convert the pressure of the power line and the bolt pressed against the piezoelectric part (31) into an electric signal.

3. The electric terminal for electric variable monitoring of an intelligent electric energy meter according to claim 2, characterized in that: The piezoelectric part (31) includes a piezoelectric ceramic (311) and a high-voltage insulating ceramic (312) connected with the piezoelectric ceramic (311).

4. The electric terminal for electric variable monitoring of an intelligent electric energy meter according to claim 3, characterized in that: The piezoelectric assembly (3) further includes a conducting part (32) arranged at one side of the piezoelectric part (31), which penetrates through the terminal body (1) and is used to connect with the PCB board of the electric energy meter; the terminal body (1) further includes a through hole (14) in communication with the blind hole (11), and the conducting part (32) cooperates with the through hole (14) and penetrates out of the through hole (14).

5. The electric terminal for electric variable monitoring of a smart meter according to claim 4, characterized in that: The conducting part (32) includes an antenna (321) and a ceramic protective sleeve (322) wrapped outside the antenna (321).

6. The electric terminal for electric variable monitoring of an intelligent electric energy meter according to claim 5, characterized in that: The induction assembly (2) further includes a plurality of protection blocks (22) slidingly arranged on the terminal body (1), which are circumferentially distributed on the outer circumferential side of the terminal body (1); the outer circumferential side of the terminal body (1) is provided with an annular groove (15) in sliding connection with the plurality of protection blocks (22).

7. The electric terminal for electric variable monitoring of a smart meter according to claim 6, characterized in that: The outer circumferential side of the adjacent protection blocks (22) is provided with a gap slot for facilitating the coil (21) to penetrate and wind.

8. An electricity stealing prevention method for an electric variable monitoring electric terminal of a smart electric energy meter, characterized in that: An electric variable monitoring electric terminal of intelligent electric energy meter is adopted. The method for preventing electricity larceny in and out of electric energy meter includes the following steps. 9.The anti-theft electricity method of the electric variable monitoring electric terminal of the smart electric energy meter according to claim 8, characterized in that: S1: connect the induction assembly (2) to the PCB board of the intelligent electric energy meter, and turn on the electric energy meter for use; S2: when the electric energy meter is in a normal working state, the terminal body (1) is powered on, and the current induced in the coil (21) wound around the outside of the terminal body (1) is positively correlated with the current in the terminal body (1); ​ S3: compare the current value induced in the coil (21) with the firewire current value measured by the electric energy meter itself; at the same time, compare the firewire current value measured by the electric energy meter itself with the zero line current value measured by the electric energy meter itself, and if the error value of the two comparisons is greater than 20%, it is judged as electricity stealing.

10. The electricity larceny prevention method of electric variable monitoring electric terminals of a smart electric energy meter according to claim 9, characterized in that: The off-meter electricity stealing prevention method comprises the following steps: S1: install the piezoelectric part (31) in the installation groove (13), and tighten the pressure line on the piezoelectric assembly (3) through bolts, and connect to the electric energy meter for normal use; S2: during the normal power-on process of the electric energy meter, the voltage signal generated by the piezoelectric part (31) is continuously output, and the user can monitor the electric signal value output by the piezoelectric part (31); S3: if the output voltage signal is large, the power line connection state is normal; if the output voltage signal is small, the power line connection is not firm; if the output voltage signal is zero, the power line has loosened or fallen off, prompting the staff to re-connect the power line; S4: compare the monitored voltage data with the historical electricity consumption data, exclude the influence of seasonal factors on electricity consumption, and compare the electricity consumption in adjacent time periods in units of weeks or months, and when the comparison result shows a small difference, trigger a warning; if the difference is significant, upgrade the warning to a suspected electricity stealing event and report it for processing.

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