CN113848360B - Load high-resistance and bypass electricity larceny detection circuit and detection method for three-phase meter - Google Patents
Load high-resistance and bypass electricity larceny detection circuit and detection method for three-phase meter Download PDFInfo
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Abstract
The invention discloses a load high-resistance and bypass electricity larceny detection circuit and a detection method for a three-phase meter, which can effectively detect the state of a relay S1 in an electric energy meter and the voltage at an output terminal end of the electric energy meter and the load impedance state of a load end when the relay S1 is in a switching-off state, can determine whether a user carries out bypass electricity larceny or not by means of the voltage of the output end, can ensure safe switching-on and power transmission of the user by means of the high-resistance state, can effectively avoid contradictions such as electricity utilization disputes, and is greatly beneficial to popularization and maintenance of an intelligent electric meter.
Description
Technical Field
The invention relates to a load high-resistance and bypass electricity larceny detection circuit which is mainly suitable for occasions for detecting a load high-resistance state and detecting bypass electricity larceny of a user under the condition that an internal relay of an electric energy meter is opened.
Background
Along with the increasing functions of intelligent electric energy meters which are important components of the intelligent power grid, various anti-electricity-theft functions are respectively developed by each electric energy meter factory, but most of the current anti-electricity-theft technologies are mainly realized through detection of auxiliary circuit current, and the contradiction of electricity utilization disputes and the like caused by misjudgment exists.
In addition, when the electricity utilization end is overloaded to use electricity, a relay in the electric energy meter can perform switching-off operation; when the power supply office recovers power supply to a user through remote switching-on; the user may be in the consciousness of no electricity to operate the electric equipment, and there is a potential safety hazard, and also there is a potential safety hazard that some electric appliances are automatically in a working state after the user goes out after power failure and the power supply office remotely resumes power supply.
Disclosure of Invention
The invention aims to solve the problems of potential safety hazards caused by the fact that when overload power is used, the electric energy meter is pulled and power supply needs to be restored and electricity larceny detection is carried out, and provides a load high-resistance bypass electricity larceny detection circuit and a detection method for a three-phase meter; the MCU of the electric energy meter detects high load resistance by switching on and off the phase-closing total gate air switch S2 by a user, and then the internal relay of the electric energy meter is automatically switched on, at the moment, the user can control the phase-closing total gate air switch S2 to be switched on in a safe state, so that safe power restoration is realized.
The technical scheme of the invention is as follows:
the invention provides a load high-resistance and bypass electricity larceny detection circuit for a three-phase meter, which is characterized in that a detection circuit is arranged in the electric energy meter, a second wiring terminal UA1, a fourth wiring terminal UB1 and a sixth wiring terminal UC1 of the three-phase circuit are respectively connected with incoming line contacts of a user side total gate air switch S2, the outgoing line contacts of the user side total gate air switch S2 are connected with one end of an electricity utilization load RL in series, and the other end of the electricity utilization load RL is connected with an eighth wiring terminal N1, and the detection circuit comprises: resistors R1-R3, diodes D1, D2, relay S1 and capacitor C1, wherein:
the first connecting terminal UA is connected with the positive electrode of the diode D1 through a resistor R1, the negative electrode of the diode D1 is connected with the positive electrode of the diode D2, and meanwhile, the first connecting terminal UA is connected with the second connecting terminal UA1; a relay S1 is connected between the first connecting terminal UA and the second connecting terminal UA1, and a control signal end of the relay S1 is connected with a control end of the MCU; the negative electrode of the diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded through a resistor R3, and the output of the detection circuit is connected with an AD processing port of the MCU to transmit a UA_CHK signal, and the two ends of the resistor R3 are connected with a capacitor C1 in parallel for smoothing waves;
for the B and C phases in the three-phase circuit, the detection circuit is identical to the a phase.
Further, the detection circuit further includes a capacitor C2, and the capacitor C2 is connected in parallel between the second connection terminal UA1 and the eighth connection terminal N1 as a parasitic capacitance on the load line.
Further, the power consumption load RL is formed by connecting a plurality of power consumption loads RL1-RLN in parallel, and the power consumption loads are respectively connected with corresponding user switches in series.
A load high resistance detection method based on a load high resistance and bypass electricity theft detection circuit for a three-phase meter, the method comprising the steps of:
step 1, setting a relay high-resistance flag bit voltage threshold THD1 under rated power supply voltage;
wherein: u (U) Forehead (forehead) Rated power supply voltage of the electric energy meter is provided;
step 2, when overload power utilization occurs to a user, a relay in the electric energy meter is opened, and the user opens and closes a phase total gate air switch S2;
step 3, for the A-phase circuit, the MCU detects the voltage value of the signal output end UA_CHK of the circuit in real time, and at the moment, the voltage value of UA_CHK is larger than the voltage threshold THD1 of the high-resistance flag bit of the relay, and the A-phase high-resistance flag bit is set to be 1, otherwise, the detection is continued; when the A-phase high-resistance flag bit is 1, the MCU further judges the state of the relay S1, when the relay S1 is closed, the A-phase load RL is judged to be non-high-resistance, the MCU does not process, the detection is continued, and when the relay S1 is disconnected, the A-phase load RL is judged to be high-resistance;
for the B phase and the C phase in the three-phase circuit, carrying out load high resistance judgment by adopting the step 3;
and 4, when the three-phase load RL is high-resistance, the MCU controls the internal relay of the electric energy meter to be switched on.
Further, the rated power supply voltage of the electric energy meter is 220V, 230V or 127V.
Further, in step 3, the method for judging the state of the relay S1 includes the following steps:
acquiring voltage value U of first connecting terminal UA in real time A The relay output state judgment threshold THD2 is calculated in real time by adopting the following formula:
comparing the voltage value of the signal output end UA_CHK of the detection circuit obtained in the step 2 with a relay output state judgment threshold THD2:
if UA_CHK is larger than THD2, the relay S1 is judged to be closed, otherwise, the relay S1 is judged to be opened.
A bypass theft detection method based on a load high resistance and bypass theft detection circuit for a three-phase meter, the method comprising the steps of:
step A1, MCU detects the state of the relay S1, when the relay S1 is disconnected, adopt the following formula to calculate the voltage of the second binding post UA 1:
wherein UA_CHK is the real-time voltage value of the signal output end of the detection circuit;
a2, calculating a power stealing number eta by adopting the following formula;
wherein U is Electric network The voltage value of the input terminal of the electric energy meter is the power supply voltage;
step A3, calculating electricity stealing coefficients of the B phase and the C phase according to the steps A1 and A2;
when the electricity stealing number of any phase is larger than the electricity stealing number threshold value eta 0 And when the user is judged to bypass electricity larceny, alarming to a power supply company, and otherwise, not processing.
Further, the rated power supply voltage is the rated power supply voltage of a common power grid, 220V or 230V or 127V; threshold value eta of electricity stealing number 0 0.9.
The invention has the beneficial effects that:
in the circuit, the state of the relay and whether the circuit is in a high impedance state can be judged by comparing the value of the actual test value with the value in a normal state.
According to the invention, through the design of the internal detection circuit of the electric energy meter and the cooperation of the operation of opening and closing the phase total gate air switch S2 by a user, the MCU of the electric energy meter detects the high resistance of the load and then automatically closes the relay in the electric energy meter, at the moment, the user can control the phase total gate air switch S2 to close in a safe state, so that the safe recovery of power supply is realized.
According to the invention, the state of the relay in actual position can be effectively detected through the internal detection circuit of the electric energy meter, the bypass electricity larceny judgment can be carried out, the contradiction such as electricity utilization disputes can be effectively avoided, and the intelligent electric energy meter is greatly facilitated to popularize and maintain.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 is a block diagram of a detection circuit.
Fig. 2 is a schematic diagram of a relay state and high resistance detection of phase a.
Fig. 3 is a schematic diagram of the relay state and high resistance detection of phase B.
Fig. 4 is a schematic diagram of the relay state and high resistance detection of phase C.
FIG. 5 is a flow chart of a high resistance test procedure.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
Embodiment one:
as shown in fig. 1, the invention provides a load high-resistance and bypass electricity larceny detection circuit for a three-phase meter, wherein a second wiring terminal UA1, a fourth wiring terminal UB1 and a sixth wiring terminal UC1 of the three-phase circuit are respectively connected with an incoming contact of a user side total gate air switch S2, an outgoing contact of the user side total gate air switch S2 is connected with one end of an electricity consumption load RL in series, the other end of the electricity consumption load RL is connected with an eighth wiring terminal N1, and the detection circuit is arranged in the electric energy meter;
as shown in fig. 2, for the a phase in the three-phase circuit, the detection circuit includes: resistors R1-R3, diodes D1, D2, relay S1 and capacitor C1, wherein:
the first connecting terminal UA is connected with the positive electrode of the diode D1 through a resistor R1, the negative electrode of the diode D1 is connected with the positive electrode of the diode D2, and meanwhile, the first connecting terminal UA is connected with the second connecting terminal UA1; a relay S1 is connected between the first connecting terminal UA and the second connecting terminal UA1, and a control signal end of the relay S1 is connected with a control end of the MCU; the negative electrode of the diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded through a resistor R3, and the output of the detection circuit is connected with an AD processing port of the MCU to transmit a UA_CHK signal, and the two ends of the resistor R3 are connected with a capacitor C1 in parallel for smoothing waves;
for the B phase in the three-phase circuit, as shown in fig. 3, the detection circuit includes: resistors R12, R22 and R32, diodes D12, D22, relay S12 and capacitor C12, wherein:
the third connecting terminal UB is connected with the positive electrode of the diode D12 through the resistor R12, the negative electrode of the diode D12 is connected with the positive electrode of the diode D22, and the third connecting terminal UB is connected with the fourth connecting terminal UB1; a relay S12 is connected between the third wiring terminal UB and the fourth wiring terminal UB1, and a control signal end of the relay S12 is connected with a control end of the MCU; the negative electrode of the diode D22 is connected with one end of a resistor R22, the other end of the resistor R22 is grounded through a resistor R32, and the output of the detection circuit is connected with an AD processing port of the MCU to transmit UB_CHK signals, and two ends of the resistor R32 are connected with a capacitor C12 in parallel for smoothing waves.
For the C phase in a three-phase circuit, as shown in fig. 4, the detection circuit includes: resistors R13, R23 and R33, diodes D13, D23, relay S13 and capacitor C13, wherein:
the fifth connecting terminal UC is connected with the positive electrode of the diode D13 through the resistor R13, the negative electrode of the diode D13 is connected with the positive electrode of the diode D23, and meanwhile, the fifth connecting terminal UC1 is connected with the sixth connecting terminal UC1; a relay S13 is connected between the fifth wiring terminal UC and the sixth wiring terminal UC1, and a control signal end of the relay S13 is connected with a control end of the MCU; the negative electrode of the diode D23 is connected to one end of a resistor R23, the other end of the resistor R23 is grounded through a resistor R33, and the output of the detection circuit is connected to the AD processing port of the MCU to deliver the uc_chk signal, and both ends of the resistor R33 are connected in parallel to a capacitor C13 for smoothing.
Further, the detection circuit further includes capacitors C2, C22 and C23, and the capacitors C2, C22 and C23 are respectively connected in parallel between the second connection terminal UA1 and the eighth connection terminal N1, between the fourth connection terminal UB1 and the eighth connection terminal N1, and between the sixth connection terminal UC1 and the eighth connection terminal N1, as parasitic capacitances on the load line.
Further, the power consumption load RL of each phase is formed by connecting a plurality of power consumption loads in parallel, and the power consumption loads are respectively connected with corresponding user switches in series.
Embodiment two:
the invention provides a load high resistance detection method, which comprises the following steps:
step 1, setting a relay high-resistance flag bit voltage threshold THD1 under rated power supply voltage;
wherein: u (U) Forehead (forehead) The rated power supply voltage of the electric energy meter is 220V, 230V or 127V and the like
Step 2, when overload power utilization occurs to a user, a relay in the electric energy meter is opened, and the user opens and closes a phase total gate air switch S2;
step 3, for the A-phase circuit, the MCU detects the voltage value of the signal output end UA_CHK of the circuit in real time, and at the moment, the voltage value of UA_CHK is larger than the voltage threshold THD1 of the high-resistance flag bit of the relay, and the A-phase high-resistance flag bit is set to be 1, otherwise, the detection is continued; when the A-phase high-resistance flag bit is 1, the MCU further judges the state of the relay S1, when the relay S1 is closed, the A-phase load RL is judged to be non-high-resistance, the MCU does not process, the detection is continued, and when the relay S1 is disconnected, the A-phase load RL is judged to be high-resistance; the method for judging the state of the relay S1 comprises the following steps:
acquiring voltage value U of first connecting terminal UA in real time A The relay output state judgment threshold THD2 is calculated in real time by adopting the following formula:
comparing the voltage value of the signal output end UA_CHK of the detection circuit obtained in the step 2 with a relay output state judgment threshold THD2:
if UA_CHK is larger than THD2, the relay S1 is judged to be closed, otherwise, the relay S1 is judged to be opened.
For the B phase and the C phase in the three-phase circuit, carrying out load high resistance judgment by adopting the step 3;
step 4, when the three-phase loads RL are all high-resistance, the MCU controls the relay in the electric energy meter to be switched on simultaneously; at this time, the power supply is restored inside the electric energy meter, and the user can control the closing of the phase-closing total gate air switch S2 in a safe state.
In the embodiment, through the design of the internal detection circuit of the electric energy meter, the MCU of the electric energy meter detects high load resistance by matching with the operation of opening and closing the phase total gate air switch S2 by a user, and then the internal relay of the electric energy meter is automatically switched on, at the moment, the user can control the phase total gate air switch S2 to be switched on in a safe state, so that the safe recovery of power supply is realized.
Embodiment III:
the invention provides a bypass electricity larceny detection method, which comprises the following steps:
a1, detecting the state of a relay S1 by an MCU;
firstly, acquiring a voltage value U of a first connecting terminal UA in real time A The relay output state judgment threshold THD2 is calculated in real time by adopting the following formula:
next, the voltage value of the signal output end ua_chk of the detection circuit is compared with the relay output state judgment threshold THD2:
if UA_CHK is larger than THD2, judging that the relay S1 is closed, otherwise, opening the relay S1;
when the relay S1 is turned off, the voltage of the second connection terminal UA1 is calculated using the following formula:
wherein UA_CHK is the real-time voltage value of the signal output end of the detection circuit;
a2, calculating a power stealing number eta by adopting the following formula;
wherein U is Electric network The voltage value of the input terminal of the electric energy meter is the power supply voltage, and the rated power supply voltage is the rated power supply voltage of a common power grid, namely 220V or 230V or 127V;
step A3, calculating electricity stealing coefficients of the B phase and the C phase according to the steps A1 and A2;
when the electricity stealing number of any phase is larger than the electricity stealing number threshold, judging that the user conducts bypass electricity stealing and giving an alarm to a power supply company, otherwise, not processing; threshold value eta of electricity stealing number 0 0.9.
According to the invention, the state of the relay in actual position can be effectively detected through the internal detection circuit of the electric energy meter, the bypass electricity larceny judgment can be carried out, the contradiction such as electricity utilization disputes can be effectively avoided, and the intelligent electric energy meter is greatly facilitated to popularize and maintain.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (8)
1. The utility model provides a load high resistance and bypass electricity larceny detection circuitry for three-phase electric energy meter, outside the three-phase electric energy meter, the second binding post UA1 of three-phase circuit, fourth binding post UB1 and sixth binding post UC1 connect user side total floodgate air switch S2 'S inlet wire contact respectively, user side total floodgate air switch S2' S outlet wire contact concatenates the one end of electricity consumption load RL, the other end of electricity consumption load RL connects eighth binding post N1, characterized in that, detection circuitry is built-in the three-phase electric energy meter, for the A phase in the three-phase circuit, detection circuitry includes: resistors R1-R3, diodes D1, D2, relay S1 and capacitor C1, wherein:
the first connecting terminal UA is connected with the positive electrode of the diode D1 through a resistor R1, the negative electrode of the diode D1 is connected with the positive electrode of the diode D2, and meanwhile, the first connecting terminal UA is connected with the second connecting terminal UA1; a relay S1 is connected between the first connecting terminal UA and the second connecting terminal UA1, and a control signal end of the relay S1 is connected with a control end of the MCU; the negative electrode of the diode D2 is connected with one end of a resistor R2, the other end of the resistor R2 is grounded through a resistor R3, and the output of the detection circuit is connected with an AD processing port of the MCU to transmit a UA_CHK signal, and the two ends of the resistor R3 are connected with a capacitor C1 in parallel for smoothing waves;
for the B phase and the C phase in the three-phase circuit, the detection circuit is the same as the A phase;
the eighth wiring terminal N1 is connected with the grounding end of the resistor R3, and the first wiring terminal UA is an A-phase voltage input end; the electricity utilization load RL comprises electricity utilization loads RL1 and RL2, and the electricity utilization loads RL1 and RL2 are connected in parallel;
the load high resistance detection method comprises the following steps:
step 1, setting a relay high-resistance flag bit voltage threshold THD1 under rated power supply voltage;
wherein: u (U) Forehead (forehead) Rated power supply voltage of the three-phase electric energy meter is provided; RL1 and RL2 are electric loads;
step 2, when overload power utilization occurs to a user, a relay in the three-phase electric energy meter is opened, and the user turns off a main gate air switch S2 at the user side;
step 3, for the A-phase circuit, the MCU detects the voltage value of the signal output end UA_CHK of the circuit in real time, and at the moment, the voltage value of UA_CHK is larger than the voltage threshold THD1 of the high-resistance flag bit of the relay, and the A-phase high-resistance flag bit is set to be 1, otherwise, the detection is continued; when the A-phase high-resistance flag bit is 1, the MCU further judges the state of the relay S1, when the relay S1 is closed, the A-phase load RL is judged to be non-high-resistance, the MCU does not process, the detection is continued, and when the relay S1 is disconnected, the A-phase load RL is judged to be high-resistance;
for the B phase and the C phase in the three-phase circuit, carrying out load high resistance judgment by adopting the step 3;
and 4, when the three-phase load RL is high-resistance, the MCU controls the internal relay of the three-phase electric energy meter to be switched on.
2. The load high resistance and bypass theft detection circuit for a three-phase electric energy meter of claim 1, wherein: the detection circuit further comprises a capacitor C2, wherein the capacitor C2 is connected in parallel between the second connection terminal UA1 and the eighth connection terminal N1 as a parasitic capacitance on the load line.
3. The load high resistance and bypass theft detection circuit for a three-phase electric energy meter of claim 1, wherein: the power consumption load RL is formed by connecting a plurality of power consumption loads RL1-RLN in parallel, and the power consumption loads are respectively connected with corresponding user switches in series.
4. The load high resistance and bypass theft detection circuit for a three-phase electric energy meter according to claim 1, wherein the rated supply voltage of the three-phase electric energy meter is 220V, 230V or 127V.
5. The load high resistance and bypass electricity theft detection circuit for a three-phase electric energy meter according to claim 1, wherein in step 3, the method for judging the state of the relay S1 is the following steps:
acquiring a first in real timeVoltage value U of terminal UA A The relay output state judgment threshold THD2 is calculated in real time by adopting the following formula:
comparing the voltage value of the signal output end UA_CHK of the detection circuit obtained in the step 3 with a relay output state judgment threshold THD2:
if UA_CHK is larger than THD2, the relay S1 is judged to be closed, otherwise, the relay S1 is judged to be opened.
6. A bypass electricity theft detection method based on the load high resistance and bypass electricity theft detection circuit for a three-phase electric energy meter of claim 1, characterized in that the method comprises the steps of:
step A1, MCU detects the state of the relay S1, when the relay S1 is disconnected, adopt the following formula to calculate the voltage of the second binding post UA 1:
wherein UA_CHK is the real-time voltage value of the signal output end of the detection circuit;
a2, calculating a power stealing number eta by adopting the following formula;
wherein U is Electric network The voltage value of the input terminal of the three-phase electric energy meter is the power supply voltage;
step A3, calculating electricity stealing coefficients of the B phase and the C phase according to the steps A1 and A2;
when the electricity stealing number of any phase is larger than the electricity stealing number threshold value eta 0 And when the user is judged to bypass electricity larceny, alarming to a power supply company, and otherwise, not processing.
7. The bypass electricity larceny detection method of claim 6, wherein the rated supply voltage is the rated supply voltage of a common power grid, 220V or 230V or 127V; threshold value eta of electricity stealing number 0 0.9.
8. The bypass electricity theft detection method according to claim 6, wherein in step A1, the method of judging the state of the relay S1 is the steps of:
acquiring voltage value U of first connecting terminal UA in real time A The relay output state judgment threshold THD2 is calculated in real time by adopting the following formula:
comparing the voltage value of the signal output end UA_CHK of the detection circuit with a relay output state judgment threshold THD2:
if UA_CHK is larger than THD2, the relay S1 is judged to be closed, otherwise, the relay S1 is judged to be opened.
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