CN111537772B - Electricity larceny prevention and false wiring prevention electric energy meter and electricity larceny prevention and false wiring prevention method - Google Patents
Electricity larceny prevention and false wiring prevention electric energy meter and electricity larceny prevention and false wiring prevention method Download PDFInfo
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- CN111537772B CN111537772B CN202010426214.0A CN202010426214A CN111537772B CN 111537772 B CN111537772 B CN 111537772B CN 202010426214 A CN202010426214 A CN 202010426214A CN 111537772 B CN111537772 B CN 111537772B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
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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
- G01R19/10—Measuring sum, difference or ratio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R21/006—Measuring power factor
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Abstract
The embodiment of the invention discloses an anti-electricity-theft and anti-misconnection electric energy meter and an anti-electricity-theft and anti-misconnection method, wherein the anti-electricity-theft and anti-misconnection electric energy meter comprises the following steps: the voltage and current acquisition unit is used for acquiring a voltage vector and a current vector which are transmitted to the electricity-stealing-prevention and error-wiring-prevention electric energy meter and transmitting the voltage vector and the current vector to the control unit; the control unit is electrically connected with the voltage and current acquisition unit and used for judging whether electricity stealing and misconnection exist or not according to the received voltage vector and current vector and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and misconnection exist; the electric quantity metering unit is electrically connected with the control unit; the shielding case, voltage and current acquisition unit, the control unit and the electric quantity metering unit are all arranged in the shielding case. The anti-electricity-theft and anti-error wiring electric energy meter and the anti-electricity-theft and anti-error wiring method provided by the embodiment of the invention can realize the anti-electricity-theft and anti-error wiring of the electric energy meter, thereby improving the accuracy and the reliability of the electric quantity metering of the electric energy meter.
Description
Technical Field
The embodiment of the invention relates to an electricity larceny prevention technology of an electric energy meter, in particular to an electricity larceny prevention and error wiring prevention electric energy meter and an electricity larceny prevention and error wiring prevention method.
Background
The electric energy metering of the electric energy meter is a terminal link of an electric power network, the reliable metering of the electric energy meter is not only related to national civilians, but also plays an extremely important role in improving the customer service quality, ensuring accurate reading and checking and receiving, reducing customer complaints and the like of electric power enterprises, and the accuracy and the reliability of the electric quantity metering of the electric energy meter are influenced by electricity stealing behaviors and wrong wiring conditions.
At present, the existing electric energy meter usually only measures the electric quantity transmitted to the electric energy meter, and cannot judge whether the electric energy meter has the electricity stealing behavior and the wrong wiring condition, if the electric energy meter has strong magnetic field or high-frequency signal interference or the electric energy meter cannot make judgment when the electric energy meter has the electricity stealing behavior of parallel impedance at the wiring position of the electric energy meter, the accuracy and the reliability of the electric quantity measurement of the electric energy meter can be influenced.
Disclosure of Invention
The embodiment of the invention provides an electricity larceny prevention and false wiring prevention electric energy meter and an electricity larceny prevention and false wiring prevention method, which are used for realizing electricity larceny prevention and false wiring of the electric energy meter, so that the accuracy and the reliability of electric quantity metering of the electric energy meter are improved.
In a first aspect, an embodiment of the present invention provides an electricity larceny prevention and mis-wiring prevention electric energy meter, including:
the voltage and current acquisition unit is used for acquiring a voltage vector and a current vector transmitted to the electricity larceny prevention and error wiring prevention electric energy meter and transmitting the voltage vector and the current vector to the control unit;
the control unit is electrically connected with the voltage and current acquisition unit and used for judging whether electricity stealing and misconnection exist or not according to the received voltage vector and current vector and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and misconnection exist;
the electric quantity metering unit is electrically connected with the control unit and is used for metering the electric quantity transmitted to the electricity larceny prevention and error wiring prevention electric energy meter and transmitting the metered electric quantity to the control unit;
the shielding cover, voltage current acquisition unit, the control unit and electric quantity metering unit all set up in the shielding cover, and the shielding cover is used for shielding the electricity larceny prevention of electricity stealing and prevents the outside strong magnetic signal and the high frequency signal of mistake wiring electric energy meter for voltage current acquisition unit, the control unit and electric quantity metering unit.
Optionally, the voltage vector is a three-phase voltage vector, the current vector is a three-phase current vector, and the control unit is configured to determine that electricity is stolen when the sum of the received three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, and generate an electricity stealing alarm signal.
Optionally, the control unit is further configured to determine a power factor angle according to the received voltage vector and current vector, determine that a miswiring exists when the power factor angle exceeds a preset angle threshold, and generate a miswiring warning signal.
Optionally, the electricity larceny prevention and false wiring prevention electric energy meter is a three-phase three-wire electric energy meter or a three-phase four-wire electric energy meter, and the preset angle threshold includes a first preset angle threshold and a second preset angle threshold;
when the electricity larceny prevention and mis-wiring prevention electric energy meter is a three-phase three-wire electric energy meter, the control unit is used for determining that mis-wiring exists when the power factor angle exceeds a first preset angle threshold value and generating a mis-wiring alarm signal; when the electricity larceny prevention and false wiring prevention electric energy meter is a three-phase four-wire electric energy meter, the control unit is used for determining that false wiring exists when the power factor angle exceeds a second preset angle threshold value.
Optionally, the control unit is in communication connection with the master station, and the control unit is further configured to send the electricity stealing alarm signal and the miswiring signal to the master station.
Optionally, the anti-electricity-theft and anti-miswiring electric energy meter further comprises a signal triggering unit, which is arranged on the inner side of the meter cover of the anti-electricity-theft electric energy meter, electrically connected with the control unit, and used for generating an uncovering alarm signal when the meter cover of the anti-electricity-theft electric energy meter is opened, transmitting the uncovering alarm signal to the control unit, and the control unit is further used for receiving the uncovering alarm signal and sending the received uncovering alarm signal to the master station.
Optionally, the electricity larceny prevention and error wiring prevention electric energy meter further comprises a nonvolatile memory and a voltage divider current transformer, the nonvolatile memory is electrically connected with the control unit, the control unit is further used for recording time, voltage, current and electric quantity when the power factor angle exceeds a preset angle threshold, and the nonvolatile memory is used for storing the time, the voltage, the current, the electric quantity and the power factor angle sent by the control unit; the voltage divider current transformer is electrically connected with the electric quantity metering unit and is used for converting the voltage and the current transmitted to the electricity larceny prevention and error wiring prevention electric energy meter into the voltage and the current which can be borne by the electric quantity metering unit.
Optionally, the shield cover is a mesh structure, the anti-electricity-theft and anti-miswiring electric energy meter comprises a meter box, the voltage and current acquisition unit, the control unit and the electric quantity metering unit are all arranged in the meter box, and the shield cover is located on each inner side surface of the meter box.
In a second aspect, an embodiment of the present invention further provides an electricity larceny prevention and false wiring preventing method, where the electricity larceny prevention and false wiring preventing method is executed by the control unit of the electricity larceny prevention and false wiring preventing electric energy meter according to the first aspect, and the electricity larceny prevention and false wiring preventing method includes:
receiving a voltage vector and a current vector transmitted to the electricity larceny prevention and error wiring prevention electric energy meter;
and judging whether electricity stealing and misconnection exist according to the received voltage vector and current vector, and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and misconnection exist.
Optionally, the voltage vector is three-phase voltage vector, and the current vector is three-phase current vector, judges whether to steal electricity and misconnection line according to received voltage vector and current vector, includes:
when the received three-phase voltage vector sum is not zero and the three-phase current vector sum is not zero, determining that electricity stealing exists;
and determining a power factor angle according to the received voltage vector and the current vector, and determining that miswiring exists when the power factor angle exceeds a preset angle threshold.
The embodiment of the invention provides an electricity larceny prevention and error wiring prevention electric energy meter and an electricity larceny prevention and error wiring prevention method.
Drawings
Fig. 1 is a block diagram of an electric energy meter capable of preventing electricity theft and miswiring according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a junction box or junction box of an electric energy meter with a shunt resistor according to an embodiment of the invention;
FIG. 3 is a schematic diagram of series impedances of a junction box or a junction box of an electric energy meter according to an embodiment of the present invention;
fig. 4 is a schematic diagram of shunt impedance of a transformer according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a three-phase voltage vector and a three-phase current vector provided by an embodiment of the invention;
fig. 6 is a block diagram of an electric energy meter for preventing electricity theft and miswiring according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a shielding case according to a second embodiment of the present invention;
fig. 8 is a flowchart of an electricity larceny prevention and false wiring prevention method provided by the third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a block diagram of an electricity larceny prevention and mis-wiring prevention electric energy meter according to an embodiment of the present invention, which is applicable to situations such as electricity larceny prevention and mis-wiring prevention of an electric energy meter, and the electricity larceny prevention and mis-wiring prevention electric energy meter includes: the device comprises a voltage and current acquisition unit 10, a control unit 20, an electricity metering unit 30 and a shielding case 40.
The voltage and current acquisition unit 10 is used for acquiring voltage vectors and current vectors transmitted to the electricity-stealing prevention and error-wiring-prevention electric energy meter and transmitting the voltage vectors and the current vectors to the control unit; the control unit 20 is electrically connected with the voltage and current acquisition unit 10, and is used for judging whether electricity stealing and misconnection exist according to the received voltage vector and current vector, and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and misconnection exist; the electric quantity metering unit 30 is electrically connected with the control unit 20 and is used for metering the electric quantity transmitted to the electricity larceny prevention and error wiring prevention electric energy meter and transmitting the metered electric quantity to the control unit 20; the voltage and current acquisition unit 10, the control unit 20 and the electric quantity metering unit 30 are all arranged in the shielding case 40, and the shielding case 40 is used for shielding strong magnetic signals and high-frequency signals outside the anti-electricity-theft wiring electric energy meter for the voltage and current acquisition unit 10, the control unit 20 and the electric quantity metering unit 30.
Optionally, the voltage vector is a three-phase voltage vector, the current vector is a three-phase current vector, and the control unit 20 is configured to determine that there is electricity stealing when the received sum of the three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, and generate an electricity stealing alarm signal.
Specifically, the control unit 21 may be a single chip microcomputer control unit, the control unit 20 may determine the magnitude of the sum of the three-phase voltage vectors according to the received three-phase voltage vectors, and determine the magnitude of the sum of the three-phase current vectors according to the received three-phase current vectors, and when the sum of the three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, the control unit 20 may determine that the electric energy meter steals electricity and generate an electricity stealing alarm signal.
Exemplarily, fig. 2 is a schematic diagram of a junction box or a junction box of an electric energy meter according to an embodiment of the present invention, as shown in fig. 2, an electricity thief connects an impedance Z in a current incoming and outgoing line loop 1 、Z 2 And Z 3 Form a shunt, resulting in the current that the device should enter
Decreasing to->
The reduction of the current can lead to the electric energy meter to count less electricity; FIG. 3 is a schematic diagram of series impedances of a junction box or a junction box of an electric energy meter according to an embodiment of the present invention, as shown in FIG. 3, an electricity thief will series an impedance Z in a voltage loop at the junction box or the junction box of the electric energy meter 1 、Z 2 And Z 3 Resulting in the original input voltage of the electric energy meter device being->
Decreasing to->
The reduction of the voltage also causes the electric energy meter to count less electricity;fig. 4 is a schematic diagram of a shunt impedance of a transformer according to an embodiment of the present invention, as shown in fig. 4, an electricity stealing person may shunt impedance Z to a terminal port of the transformer on an ABC three-phase line 1 、Z 2 And Z 3 Resulting in low current to steal electricity; for the electricity stealing modes such as impedance connection in parallel, impedance connection in series and impedance connection in parallel at the terminal port of the mutual inductor, the present embodiment determines whether electricity stealing occurs or not by the control unit 20 according to the received voltage vector and current vector, and generates an electricity stealing alarm signal when electricity stealing occurs, so as to achieve the purpose of preventing electricity stealing.
In practical situations, even if an electricity stealing person can change the circuit shunting and voltage division inside a device or equipment, the electricity stealing person cannot ensure that the impedances of all phases are completely consistent (the external series impedance ensures that three phases are completely the same and almost impossible) in the electricity stealing mode of changing the contact impedance, the contact tightness degree can affect the contact impedance, therefore, the sum of the three-phase voltage vectors and the sum of the three-phase current vectors are not zero and have a certain deviation as a condition for electricity stealing, fig. 5 is a schematic diagram of the three-phase voltage vectors and the three-phase current vectors provided by the first embodiment of the invention, and whether the sum of the three-phase voltage vectors and the sum of the three-phase current vectors is zero or not is not affected by the voltage and the current, as shown in fig. 5, the three-phase current vectors are different in size but do not affect the sum of the three-phase current vectors to be zero. When the sum of the three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, electricity stealing behavior exists, so that electricity stealing is determined to exist when the sum of the received three-phase voltage vectors is not zero and the sum of the received three-phase current vectors is not zero through the control unit 20, and an electricity stealing alarm signal is generated, so that the purpose of preventing electricity stealing is achieved.
Optionally, the control unit 20 is further configured to determine a power factor angle according to the received voltage vector and current vector, determine that a mis-wiring occurs when the power factor angle exceeds a preset angle threshold, and generate a mis-wiring warning signal.
If the preset angle threshold stored in the control unit 20 is 50 degrees, when the power factor angle determined by the control unit 20 exceeds 50 degrees, the control unit 20 determines that the wire is misconnected and generates a misconnection warning signal.
Illustratively, for high-frequency electricity stealing, such as a high-voltage high-power police electric shock rod (the instantaneous voltage can reach 50 kilovolts, and the frequency is more than 10G). The electromagnetic interference generated by the high-frequency high-voltage power supply can influence the receiving of broadcasting, television and communication, so that the electronic instruments and equipment are in abnormal operation, invalid and even damaged, the high-frequency high-voltage power supply in a current system causes the high-frequency high-voltage power supply to interfere the internal work flow of the electric energy meter, the work curve of the electric energy meter is damaged, the metering accuracy of the electric energy meter is low, and the electric energy meter cannot be metered normally. High frequency electromagnetic signal is transmitted to the electric energy meter outside the meter box through the high frequency high voltage rod, the electric energy meter is caused to count less electric quantity, the traditional meter box can not block due to the great penetrating power of the high frequency signal, particularly the electric energy meter box with a meter reading observation window is provided, the high frequency high voltage rod causes great damage to the electronic electric energy meter, the operation time is short (can be carried out for several seconds), and no electricity stealing trace is left on the site. Aiming at the condition that the metering of the electric energy meter is influenced by high-frequency and strong magnetic interference, the voltage and current acquisition unit 10, the control unit 20 and the electric quantity metering unit 30 are shielded by the shielding cover 40 to shield strong magnetic signals and high-frequency signals outside the electric energy meter capable of preventing electricity stealing and false wiring, so that the automatic cancellation of the strong magnetic and high-frequency signals outside can be realized, two types of external interference can be blocked, the electric quantity metering unit 30 is prevented from not metering or metering less electric quantity, and the problem of electricity stealing due to external interference can be solved for a long time.
It should be noted that, the specific value of the preset angle threshold may be determined according to actual situations, and is not limited herein.
The electricity larceny prevention and false wiring prevention electric energy meter provided by the embodiment is characterized in that a shielding cover is a voltage and current acquisition unit, a control unit and an electric quantity metering unit shield strong magnetic signals and high-frequency signals outside the electricity larceny prevention and false wiring prevention electric energy meter, the control unit receives voltage vectors and current vectors and judges whether electricity larceny and false wiring exist or not, an electricity larceny alarm signal and a false wiring alarm signal are generated respectively when the electricity larceny and false wiring are determined, electricity larceny prevention and false wiring prevention of the electric energy meter are achieved, and accuracy and reliability of electric quantity metering of the electric energy meter are improved.
Example two
Fig. 6 is a block diagram of an electricity larceny prevention and error connection prevention electric energy meter according to a second embodiment of the present invention, which is based on the first embodiment, with reference to fig. 6, optionally, the electricity larceny prevention and error connection prevention electric energy meter is a three-phase three-wire electric energy meter or a three-phase four-wire electric energy meter, and the preset angle threshold includes a first preset angle threshold and a second preset angle threshold; when the electricity larceny prevention and mis-wiring prevention electric energy meter is a three-phase three-wire electric energy meter, the control unit 20 is used for determining that mis-wiring exists when the power factor angle exceeds a first preset angle threshold value and generating a mis-wiring alarm signal; when the electricity larceny prevention and misconnection prevention electric energy meter is a three-phase four-wire electric energy meter, the control unit 20 is used for determining misconnection when the power factor angle exceeds a second preset angle threshold.
Specifically, the first preset angle threshold and the second preset angle threshold can be respectively 50 degrees and 20 degrees, the three-phase three-wire electric energy meter comprises two voltage elements and two current elements, and the wiring principle is that the first element is connected with the two current elements
The second element is connected>
When the three-phase load is balanced and the load is pure resistance->
And &>
The phase difference between the two is 30 degrees, most loads are inductive loads, the power factor angle is within a certain range (such as 0-50 degrees), and when the power factor angle exceeds 50 degrees, the control unit 20 determines that the wire is misconnected and generates a misconnection alarm signal; the three-phase four-wire electric energy meter comprises three voltage elements and three current elements, the three elements respectively measure active powers P1, P2 and P3, and the active power is based on the three-phase load balance and the load is pure resistance>
And
the phase difference between the two signals is 0 degree, and since most loads are inductive loads and the power factor angle is within a certain range (such as 0-20 degrees), when the power factor angle exceeds 20 degrees, the control unit 20 determines that the wire is misconnected and generates a misconnection alarm signal.
It should be noted that specific numerical values of the first preset angle threshold and the second preset angle threshold may be determined according to actual situations, and are not limited herein.
Optionally, the control unit 20 is in communication connection with the master station, and the control unit 20 is further configured to send the electricity stealing alarm signal and the miswiring signal to the master station.
The master station can receive the electricity stealing alarm signal and the misconnection signal sent by the control unit 20, so that relevant staff can check whether the master station has the electricity stealing alarm signal and the misconnection signal, and take corresponding measures in time when the relevant staff check that the master station has the electricity stealing alarm signal and the misconnection signal.
Optionally, the anti-electricity-theft and anti-miswiring electric energy meter further includes a signal triggering unit 50, which is disposed inside the cover of the anti-electricity-theft electric energy meter and electrically connected to the control unit 20, and is configured to generate a cover opening warning signal when the cover of the anti-electricity-theft electric energy meter is opened, and transmit the cover opening warning signal to the control unit 20, and the control unit 20 is further configured to receive the cover opening warning signal and send the received cover opening warning signal to the master station.
The signal trigger unit 50 is arranged on the inner side of the meter cover of the electricity larceny prevention electric energy meter, when the meter cover of the electricity larceny prevention electric energy meter is opened to open the meter cover if someone wants to steal electricity, the signal trigger unit 50 can generate an uncovering alarm signal and transmit the uncovering alarm signal to the control unit 20, the control unit 20 receives the uncovering alarm signal and sends the received uncovering alarm signal to the master station, and therefore relevant workers can take corresponding measures in time when seeing that the master station has the uncovering alarm signal.
Optionally, the electricity larceny prevention and error connection prevention electric energy meter further comprises a nonvolatile memory 60 and a voltage divider current transformer 70, the nonvolatile memory 60 is electrically connected with the control unit 20, the control unit 20 is further configured to record time, voltage, current and electric quantity when the power factor angle exceeds a preset angle threshold, and the nonvolatile memory 60 is configured to store the time, the voltage, the current, the electric quantity and the power factor angle sent by the control unit 20; the voltage divider current transformer 70 is electrically connected to the electricity metering unit 30, and is configured to convert the voltage and current transmitted to the electricity larceny prevention and mis-wiring prevention electric energy meter into the voltage and current that can be borne by the electricity metering unit 30.
Wherein, the nonvolatile memory 60 stores each data sent by the control unit 20 so as to be recalled by the control unit 20 when the stored data is needed, and the voltage divider current transformer 70 outputs the voltage of each power supply for supplying power to the electric energy meter
And current->
The value of (b) is reduced to a value that can be measured by the electricity amount measuring unit 30, so that the amount of power supplied to each power supply is measured by the electricity amount measuring unit 30.
Exemplarily, the electricity larceny prevention and false wiring prevention electric energy meter further comprises a check pulse unit 21, a liquid crystal display screen 22, an infrared communication port 23, a watchdog circuit 24 and a real-time clock circuit 25 which are electrically connected with the control unit 20, an electric quantity metering indication unit 31 which is electrically connected with the electric quantity metering unit 30, and a data holding battery 32, a power management unit 33 and a power supply 34 which are electrically connected in sequence; the control unit 21 can be a single chip microcomputer control unit, the power supply 34 is electrically connected with the voltage divider current transformer 70, the control unit 20 is externally connected with an RS485 interface 26 to be conveniently connected with an electric energy acquisition terminal, the check pulse unit 21 is electrically connected with the control unit 20 through the electric quantity metering unit 30, and a key field of a trigger signal is arranged in the electric energy meter to realize multi-power supply shunt metering; an RS485 interface 26 externally connected with the control unit 20 is convenient to be connected with an electric energy acquisition terminal; the diode is conducted in the process of measuring the electric quantity by the electric quantity measuring unit 30, red light flickers, operation and maintenance personnel can conveniently know that data reading is carried out at the moment, the electric quantity information measured by the electric quantity measuring unit 20 is transmitted to the single chip microcomputer control unit, and the information is timely collected and stored through the nonvolatile memory 60; the liquid crystal display 22 can display the electric quantity sent by the control unit 20, the mobile device is convenient for acquiring information such as the electric quantity and the power factor of the control unit 20 through the infrared communication port 23, the watchdog circuit 24 can realize circuit monitoring, the control unit 20 is prevented from running collapse, the real-time clock circuit 25 can realize automatic time synchronization with the electric quantity acquisition terminal, and meanwhile, the electric quantity metering indication unit 31 is automatically transmitted to the control unit 20 in the self-display time, is electrically connected with the electric quantity metering unit 30 and can indicate the state of the electric quantity metering unit 30.
Optionally, the shielding cover 40 is a mesh structure, the anti-electricity-theft and anti-misconnection electric energy meter includes a meter box 80, the voltage and current collecting unit 10, the control unit 20 and the electric quantity metering unit 30 are all arranged in the meter box 80, and the shielding cover 40 is located on each inner side surface of the meter box 80.
Illustratively, when the strong magnetic field is used for disturbing the metering of the electric quantity metering unit 30, a strong magnet is placed outside the meter box 80, CT in the electric energy meter is magnetically saturated by changing the intensity of the magnetic field in the meter box 80, the metering current of the electric energy meter is reduced, and electricity can be stolen without damaging a lead seal. The external display of the electric energy meter is not different from the normal operation, but the current value measured by the electric quantity measuring unit 30 is reduced from 5.50A to 0.30A due to the influence of strong magnets, and the electric quantity is lost by about 94%. To this end, the anti-electricity-theft and anti-miswiring electric energy meter shields strong magnetic signals and high frequency signals by arranging the shielding cover 40, fig. 7 is a schematic structural diagram of a shielding cover provided by the second embodiment of the present invention, referring to fig. 6 and 7, the shielding cover 40 with a mesh structure is located on each inner side surface of the meter box 80, and can be made of steel structural materials, so as to effectively shield the strong magnetic signals and high frequency signals outside the anti-electricity-theft and anti-miswiring electric energy meter for the voltage and current acquisition unit 10, the control unit 20 and the electric quantity metering unit 30 arranged in the meter box 80, and automatically cancel the external strong magnetic signals and high frequency signals, block two types of external interferences, prevent the electric quantity metering unit 30 from metering or counting less electric quantity, and solve the problem of external interference and electricity-theft for a long time.
The anti-electricity-theft and anti-miswiring electric energy meter provided by the embodiment is characterized in that the shielding covers on the inner side surfaces of the meter box are voltage and current acquisition units arranged in the meter box, the control unit and the electric quantity metering unit shield strong magnetic signals and high frequency signals outside the electric energy meter, the control unit receives the voltage vectors and the current vectors and judges whether electricity-theft and miswiring exist or not, and electricity-theft alarm signals and miswiring alarm signals are respectively generated when electricity-theft and miswiring are determined to exist, so that electricity-theft and anti-miswiring of the electric energy meter are realized, the accuracy and reliability of electric quantity metering of the electric energy meter are improved, the control unit can also send the electricity-theft alarm signals and the miswiring signals to a master station in communication connection with the control unit, and relevant workers can timely take corresponding measures when finding that the master station has the electricity-theft alarm signals and the miswiring signals.
EXAMPLE III
Fig. 8 is a flowchart of a method for preventing fraudulent use of electricity and incorrect wiring according to a third embodiment of the present invention, where the method is executed by a control unit of an electricity meter according to any of the third embodiments, and specifically includes the following steps:
and step 110, receiving a voltage vector and a current vector which are transmitted to the electricity larceny prevention and false wiring prevention electric energy meter.
The voltage vector and the current vector can be acquired by a voltage and current acquisition unit electrically connected with the control unit, the voltage and current acquisition unit acquires the voltage vector and the current vector transmitted to the anti-electricity-theft and anti-miswiring electric energy meter, and the control unit can receive the voltage vector and the current vector transmitted by the voltage and current acquisition unit through a port arranged by the control unit.
And step 120, judging whether electricity stealing and misconnection exist according to the received voltage vector and current vector, and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and misconnection exist.
Illustratively, the voltage vector is a three-phase voltage vector, the current vector is a three-phase current vector, and when the sum of the received three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, electricity stealing is determined and an electricity stealing alarm signal is generated; and determining a power factor angle according to the received voltage vector and current vector, and determining that mis-wiring exists and generating a mis-wiring warning signal when the power factor angle exceeds a preset angle threshold.
The electricity larceny prevention and error wiring prevention method provided by the embodiment has the corresponding beneficial effects of electricity larceny prevention and error wiring prevention electric energy meters.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. The utility model provides an anti-electricity-theft prevents mistake wiring electric energy meter which characterized in that includes:
the voltage and current acquisition unit is used for acquiring a voltage vector and a current vector which are transmitted to the electricity-stealing-prevention and error-wiring-prevention electric energy meter and transmitting the voltage vector and the current vector to the control unit;
the control unit is electrically connected with the voltage and current acquisition unit and used for judging whether electricity stealing and misconnection exist or not according to the received voltage vector and the current vector and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and the misconnection exist;
the electric quantity metering unit is electrically connected with the control unit and is used for metering the electric quantity transmitted to the electricity-stealing-prevention and error-wiring-prevention electric energy meter and transmitting the metered electric quantity to the control unit;
the voltage and current acquisition unit, the control unit and the electric quantity metering unit are all arranged in the shielding cover, and the shielding cover is used for shielding strong magnetic signals and high-frequency signals outside the electricity larceny prevention and error wiring prevention electric energy meter for the voltage and current acquisition unit, the control unit and the electric quantity metering unit;
the anti-electricity-theft and anti-misoperation wiring electric energy meter further comprises a nonvolatile memory and a voltage divider current transformer, wherein the nonvolatile memory is electrically connected with the control unit, the control unit is also used for recording time, voltage, current and electric quantity when a power factor angle exceeds a preset angle threshold value, and the nonvolatile memory is used for storing the time, the voltage, the current, the electric quantity and the power factor angle sent by the control unit; the voltage divider current transformer is electrically connected with the electric quantity metering unit and is used for converting the voltage and the current transmitted to the electricity larceny prevention and error wiring preventing electric energy meter into the voltage and the current which can be born by the electric quantity metering unit;
the control unit is further used for determining a power factor angle according to the received voltage vector and the received current vector, determining that miswiring exists when the power factor angle exceeds a preset angle threshold, and generating a miswiring warning signal.
2. The anti-electricity-theft and anti-miswiring electric energy meter according to claim 1, wherein the voltage vectors are three-phase voltage vectors, the current vectors are three-phase current vectors, and the control unit is configured to determine that there is electricity theft when the received sum of the three-phase voltage vectors is not zero and the sum of the three-phase current vectors is not zero, and generate an electricity-theft alarm signal.
3. The electricity larceny prevention and mis-wiring prevention electric energy meter according to claim 1, wherein the electricity larceny prevention and mis-wiring prevention electric energy meter is a three-phase three-wire electric energy meter or a three-phase four-wire electric energy meter, and the preset angle threshold comprises a first preset angle threshold and a second preset angle threshold;
when the electricity larceny prevention and false wiring prevention electric energy meter is a three-phase three-wire electric energy meter, the control unit is used for determining that false wiring exists when the power factor angle exceeds the first preset angle threshold value and generating a false wiring alarm signal; when the electricity larceny prevention and mis-wiring prevention electric energy meter is a three-phase four-wire electric energy meter, the control unit is used for determining that mis-wiring exists when the power factor angle exceeds the second preset angle threshold.
4. The electricity larceny prevention and mis-wiring prevention electric energy meter as claimed in claim 1, wherein the control unit is in communication connection with a master station, and the control unit is further configured to send the electricity larceny warning signal and the mis-wiring warning signal to the master station.
5. The anti-electricity-theft and anti-miswiring electric energy meter according to claim 4, further comprising a signal triggering unit, disposed inside a cover of the anti-electricity-theft and anti-miswiring electric energy meter, electrically connected to the control unit, and configured to generate a cover opening warning signal when the cover of the anti-electricity-theft and anti-miswiring electric energy meter is opened, and transmit the cover opening warning signal to the control unit, and the control unit is further configured to receive the cover opening warning signal, and transmit the received cover opening warning signal to the master station.
6. The electric energy meter according to claim 1, wherein the shielding case is a net structure, the electric energy meter comprises a meter case, the voltage and current collecting unit, the control unit and the electric quantity measuring unit are disposed in the meter case, and the shielding case is disposed on inner sides of the meter case.
7. An electricity larceny prevention and error wiring preventing method, characterized in that the electricity larceny prevention and error wiring preventing method is executed by the control unit of the electricity larceny prevention and error wiring preventing electric energy meter of any one of claims 1 to 6, and the electricity larceny prevention and error wiring preventing method comprises:
receiving a voltage vector and a current vector transmitted to the electricity larceny prevention and false wiring prevention electric energy meter;
judging whether electricity stealing and misconnection exist or not according to the received voltage vector and the received current vector, and respectively generating an electricity stealing alarm signal and a misconnection alarm signal when the electricity stealing and the misconnection exist;
and determining a power factor angle according to the received voltage vector and the current vector, and determining that mis-wiring exists when the power factor angle exceeds a preset angle threshold.
8. The method of claim 7, wherein the voltage vectors are three-phase voltage vectors and the current vectors are three-phase current vectors, and determining whether there is a power theft and a miswire connection according to the received voltage vectors and current vectors comprises:
and determining that electricity is stolen when the received three-phase voltage vector sum is not zero and the three-phase current vector sum is not zero.
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