CN110988780B - Method for realizing power frequency anti-shunt running and electric energy meter - Google Patents
Method for realizing power frequency anti-shunt running and electric energy meter Download PDFInfo
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- CN110988780B CN110988780B CN201911072615.4A CN201911072615A CN110988780B CN 110988780 B CN110988780 B CN 110988780B CN 201911072615 A CN201911072615 A CN 201911072615A CN 110988780 B CN110988780 B CN 110988780B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
The embodiment of the invention discloses a method for realizing power frequency anti-shunt running and an electric energy meter, wherein the method comprises the following steps: identifying a specification constant of the electric energy meter, and calculating the starting power and the starting time of the metering chip according to the specification constant; reading current data, active power and pulse signal behaviors in the running process of the electric energy meter; judging whether the current data is smaller than a current preset threshold value or not, and if the current data is smaller than the current preset threshold value, immediately resetting the value of a fast pulse counter in the metering chip; judging whether the active power is smaller than a preset power threshold value or not, and immediately resetting the value of a fast pulse counter in the metering chip if the active power is smaller than the preset power threshold value; and judging whether pulse signal behaviors exist in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately resetting the value of a fast pulse counter in the metering chip. The embodiment of the invention can perform 0.5mT power frequency anti-shunt without adding any component.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method for realizing power frequency anti-shunt running and an electric energy meter.
Background
With the development and progress of the electric energy meter industry, the requirement of the anti-creeping test under a power frequency magnetic field of 0.5mT is gradually increased in the electric energy meter detection project in the industry. The purpose is to detect whether the electric energy meter has antimagnetic measures to a power frequency magnetic field or not by analyzing the fault characteristics of the electric energy meter under the power frequency magnetic field so as to ensure that the electric energy meter can accurately measure and test in the power frequency magnetic field environment. The technical requirement is that under the interference of a 0.5mT power frequency magnetic field, the electric energy meter is placed at the most sensitive position of the magnetic field intensity interference, the voltage circuit of the electric energy meter has 115% Un, the current loop has no current, and the electric energy meter can not generate more than one pulse output within 20 times of theoretical starting time.
However, the existing electric energy meter cannot substantially meet the corresponding setting requirement, and how to implement the electric energy meter without changing the existing hardware condition needs to provide a corresponding solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for realizing power frequency anti-shunt running and an electric energy meter, which firstly calculate the starting time according to the specification of the electric energy meter and a starting threshold value; judging whether an interference environment similar to a 0.5mT power frequency magnetic field is generated according to the current and power of the electric energy meter in the operation process; and finally, performing power frequency anti-shunt operation on the software. The invention can perform 0.5mT power frequency anti-shunt running on the basis of the original meter hardware without adding any component.
In order to solve the problems, the invention provides a method for realizing power frequency anti-shunt running, which comprises the following steps:
identifying a specification constant of the electric energy meter, and calculating the starting power and the starting time of the metering chip according to the specification constant;
reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
judging whether the current data is smaller than a current preset threshold value or not, and if the current data is smaller than the current preset threshold value, immediately resetting the value of a fast pulse counter in the metering chip;
judging whether the active power is smaller than a preset power threshold value, wherein the preset power threshold value is 80% of starting power, and if the active power is smaller than the preset power threshold value, immediately resetting the value of a fast pulse counter in the metering chip;
and judging whether a pulse signal behavior exists in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately resetting the value of a fast pulse counter in the metering chip, wherein the anti-shunt running time is 1.1 times of the starting time.
The preset current threshold is 20 milliamperes.
The method further comprises the following steps: and if the active power is greater than a preset power threshold value, normally running for metering.
The step of judging whether a pulse signal behavior exists in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately clearing the value of a fast pulse counter in the metering chip comprises the following steps:
after the electric energy meter is identified to enter the running state, triggering a timer to carry out accumulated timing;
judging whether a pulse signal behavior is generated or not, if so, triggering the accumulated timing on the timer to be cleared, and re-triggering the timer to perform accumulated timing;
if the pulse signal behavior is judged not to be generated, whether the accumulated time exceeds the anti-shunt running time or not is judged, if the accumulated time does not exceed the anti-shunt running time, whether the pulse signal behavior is generated or not is continuously judged, and if the accumulated time exceeds the anti-shunt running time, the value of a fast pulse counter in the metering chip is immediately cleared.
The method further comprises the following steps: if the anti-shunt running time is exceeded, the method also comprises the following steps after the value of the fast pulse counter in the metering chip is immediately cleared:
and triggering the timer again to perform accumulated timing.
Correspondingly, the invention also provides an electric energy meter, which comprises:
the identification module is used for identifying the specification constant of the electric energy meter and calculating the starting power and the starting time of the metering chip according to the specification constant;
the reading module is used for reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
the first processing module is used for judging whether the current data is smaller than a current preset threshold value or not, and immediately resetting the value of a fast pulse counter in the metering chip if the current data is smaller than the current preset threshold value;
the second processing module is used for judging whether the active power is smaller than a preset power threshold value, wherein the preset power value is 80% of the starting power, and if the active power is smaller than the preset power threshold value, the value of a fast pulse counter in the metering chip is cleared immediately;
and the third processing module is used for judging whether pulse signal behaviors exist in the anti-shunt running time, and immediately clearing the value of a fast pulse counter in the metering chip if no pulse is generated in the anti-shunt running time, wherein the anti-shunt running time is 1.1 times of the starting time.
The preset current threshold is 20 milliamperes.
And the second processing module normally operates and measures if the active power is greater than a preset power threshold.
The third processing module triggers a timer to carry out accumulated timing after identifying that the electric energy meter enters the running state; judging whether a pulse signal behavior is generated or not, if so, triggering the accumulated timing on the timer to be cleared, and re-triggering the timer to perform accumulated timing; if the pulse signal behavior is judged not to be generated, whether the accumulated time exceeds the anti-shunt running time or not is judged, if the accumulated time does not exceed the anti-shunt running time, whether the pulse signal behavior is generated or not is continuously judged, and if the accumulated time exceeds the anti-shunt running time, the value of a fast pulse counter in the metering chip is immediately cleared.
And after the third processing module immediately clears the value of the fast pulse counter in the metering chip when the anti-shunt running time is exceeded, the timer is triggered again to carry out accumulated timing.
The embodiment of the invention firstly calculates the starting time according to the specification of the electric energy meter and the starting threshold value; judging whether an interference environment similar to a 0.5mT power frequency magnetic field is generated according to the current and power of the electric energy meter in the operation process; and finally, performing power frequency anti-shunt operation on the software. The invention can perform 0.5mT power frequency anti-shunt running on the basis of the original meter hardware without adding any component. The embodiment of the invention can realize the test requirement of 0.5mT power frequency shunt running prevention through the electric energy meter software under the condition of not increasing the hardware cost. The power frequency anti-shunt running code amount is small, and the size of the whole space of the software is not influenced. In field application, redundant pulse output and energy accumulation caused by an external magnetic field can be effectively prevented.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for achieving power frequency anti-shunt in an embodiment of the invention;
FIG. 2 is a diagram illustrating a fast pulse counter of a RN8209C metrology chip in accordance with an embodiment of the present invention;
FIG. 3 is a flowchart of a method for power frequency anti-shunt running through accumulated time of an electric energy meter according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of an electric energy meter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for realizing power frequency anti-shunt running provided by the embodiment of the invention comprises the steps of identifying the specification constant of the electric energy meter, and calculating the starting power and the starting time of the metering chip according to the specification constant; reading current data, active power and pulse signal behaviors in the running process of the electric energy meter; judging whether the current data is smaller than a current preset threshold value or not, and if the current data is smaller than the current preset threshold value, immediately resetting the value of a fast pulse counter in the metering chip; judging whether the active power is smaller than a preset power threshold value, wherein the preset power threshold value is 80% of starting power, and if the active power is smaller than the preset power threshold value, immediately resetting the value of a fast pulse counter in the metering chip; and judging whether a pulse signal behavior exists in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately resetting the value of a fast pulse counter in the metering chip, wherein the anti-shunt running time is 1.1 times of the starting time.
Specifically, fig. 1 shows a flowchart of a method for achieving power frequency anti-shunt in an embodiment of the present invention, which includes the following specific steps:
s101, identifying a specification constant of the electric energy meter, and calculating the starting power and the starting time of the metering chip according to the specification constant;
fig. 2 shows a fast pulse counter depiction of the RN8209C metrology chip. When the absolute value of the rapid pulse counter is larger than or equal to the pulse output threshold value, the pulse output port outputs a pulse signal, and the electric energy is accumulated correspondingly.
In order to prevent power loss during power up and power down, the MCU reads back and saves the values of the register PFCnt/DFcnt during power down, and then the MCU rewrites the values into the PFCnt/DFcnt during next power up. When the absolute value of 2 times of the count value of the fast pulse calculator PFCnt/DFcnt is greater than or equal to HFconst, the corresponding PF/QF will have pulse overflow, and the value of the energy register will be correspondingly increased by 1.
In S101, the start power and the start time of the metering chip may be calculated according to the specification constant of the electric energy meter. For example: voltage 220V, current 5A, pulse constant 1200imp/kWh, starting power P5A × 0.4% × 220V 4.4W, starting time
S102, reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
s103, judging whether the current data is smaller than a current preset threshold value, if so, entering S106, and if not, entering S107;
s104, judging whether the active power is smaller than a preset power threshold, if so, entering S106, and if not, entering S107;
if any one of the conditions of S103 and S104 is satisfied, the process proceeds to S106, where the preset current threshold is set to 20mA, and the preset power threshold is 80% of the starting power, that is, it may be set whether the active power is less than 3.5W, and the counter is prevented from being accumulated to the starting threshold and sending out a pulse by immediately clearing the value of the fast pulse counter in the metering chip.
S105, judging whether a pulse signal behavior exists in the anti-shunt running time, if no pulse is generated in the anti-shunt running time, entering S106, and if the pulse is generated, entering S108;
the anti-shunt running time is set to be 15min (1.1 times of the starting time), when the electric energy meter does not send out the pulse within 15min, the value of a fast pulse counter in the metering chip is cleared immediately to prevent the time from being long, and the value of the fast pulse counter is slowly accumulated to send out the pulse within 20 times of the theoretical starting time.
S106, immediately clearing the value of a fast pulse counter in the metering chip;
s107, normal operation metering;
s108, triggering the timer again to carry out accumulated timing
Based on the method shown in fig. 1, software arranged on the electric energy meter can acquire active power data in the metering chip every second, threshold judgment is carried out on the data, if the active power is larger than a starting threshold (which is designed to be 80% of the starting power), metering is normally operated, and otherwise, the value in the rapid pulse counter is cleared, so that the accumulation of the value and the output of pulses are avoided, and the anti-shunt failure is caused.
Correspondingly, fig. 3 shows a flowchart of a method for power frequency anti-shunt through accumulated time of the electric energy meter in the embodiment of the present invention, and specific details of the step S105 include the following specific steps:
s301, after the electric energy meter is identified to enter the running state, triggering a timer to perform accumulated timing;
s302, judging whether a pulse signal behavior is generated or not, if so, entering S305, and if not, entering S303;
s303, judging whether the accumulated time exceeds the anti-shunt running time, if not, continuing to enter S302 to judge whether a pulse signal behavior is generated, and if so, entering S34;
s304, immediately clearing the value of a fast pulse counter in the metering chip;
and S305, triggering the timer to perform zero clearing on the accumulated time, and re-triggering the timer to perform the accumulated time.
Based on the method shown in fig. 3, a timer is arranged on the electric energy meter, the timer accumulates time every second, and when the accumulated time is greater than the anti-shunt time by 15 minutes (1.1 times of the starting time), the value in the fast pulse counter is cleared, and the accumulated value of the timer is cleared. In the normal metering process, the pulse is sent within the starting time (13.64 min in the example), once the pulse is sent, the pulse interruption is triggered, and the accumulated value of the timer is cleared in the pulse interruption service function, so that the value of the fast pulse error counter cannot be cleared in normal operation.
Correspondingly, fig. 4 also shows a schematic structural diagram of an electric energy meter in an embodiment of the present invention, where the electric energy meter includes:
the identification module is used for identifying the specification constant of the electric energy meter and calculating the starting power and the starting time of the metering chip according to the specification constant;
the reading module is used for reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
the first processing module is used for judging whether the current data is smaller than a current preset threshold value or not, and immediately resetting the value of a fast pulse counter in the metering chip if the current data is smaller than the current preset threshold value;
the second processing module is used for judging whether the active power is smaller than a preset power threshold value, wherein the preset power value is 80% of the starting power, and if the active power is smaller than the preset power threshold value, the value of a fast pulse counter in the metering chip is cleared immediately;
and the third processing module is used for judging whether pulse signal behaviors exist in the anti-shunt running time, and immediately clearing the value of a fast pulse counter in the metering chip if no pulse is generated in the anti-shunt running time, wherein the anti-shunt running time is 1.1 times of the starting time.
Note that, here, the current preset threshold is 20 ma.
It should be noted that, here, the second processing module normally operates the metering if the active power is greater than the preset power threshold.
It should be noted that, after the third processing module recognizes that the electric energy meter enters the running state, the third processing module triggers the timer to perform cumulative timing; judging whether a pulse signal behavior is generated or not, if so, triggering the accumulated timing on the timer to be cleared, and re-triggering the timer to perform accumulated timing; if the pulse signal behavior is judged not to be generated, whether the accumulated time exceeds the anti-shunt running time or not is judged, if the accumulated time does not exceed the anti-shunt running time, whether the pulse signal behavior is generated or not is continuously judged, and if the accumulated time exceeds the anti-shunt running time, the value of a fast pulse counter in the metering chip is immediately cleared.
It should be noted that, here, the third processing module triggers the timer again to perform the cumulative timing after immediately clearing the value of the fast pulse counter in the metering chip when the anti-shunt running time is exceeded.
To sum up, the embodiment of the invention firstly calculates the starting time according to the specification of the electric energy meter and the starting threshold value; judging whether an interference environment similar to a 0.5mT power frequency magnetic field is generated according to the current and power of the electric energy meter in the operation process; and finally, performing power frequency anti-shunt operation on the software. The invention can perform 0.5mT power frequency anti-shunt running on the basis of the original meter hardware without adding any component. The embodiment of the invention can realize the test requirement of 0.5mT power frequency shunt running prevention through the electric energy meter software under the condition of not increasing the hardware cost. The power frequency anti-shunt running code amount is small, and the size of the whole space of the software is not influenced. In field application, redundant pulse output and energy accumulation caused by an external magnetic field can be effectively prevented.
In addition, the method for realizing power frequency anti-shunt running and the electric energy meter provided by the embodiment of the invention are described in detail, a specific embodiment is applied in the method for explaining the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A method for realizing power frequency anti-shunt running is characterized by comprising the following steps:
identifying a specification constant of the electric energy meter, and calculating the starting power and the starting time of the metering chip according to the specification constant;
reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
judging whether the current data is smaller than a current preset threshold value or not, and if the current data is smaller than the current preset threshold value, immediately resetting the value of a fast pulse counter in the metering chip;
judging whether the active power is smaller than a preset power threshold value, wherein the preset power threshold value is 80% of starting power, and if the active power is smaller than the preset power threshold value, immediately resetting the value of a fast pulse counter in the metering chip;
judging whether pulse signal behaviors exist in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately resetting the value of a rapid pulse counter in a metering chip, wherein the anti-shunt running time is 1.1 times of the starting time;
the step of judging whether a pulse signal behavior exists in the anti-shunt running time, and if no pulse is generated in the anti-shunt running time, immediately clearing the value of a fast pulse counter in the metering chip comprises the following steps:
after the electric energy meter is identified to enter the running state, triggering a timer to carry out accumulated timing;
judging whether a pulse signal behavior is generated or not, if so, triggering the accumulated timing on the timer to be cleared, and re-triggering the timer to perform accumulated timing;
if the pulse signal behavior is judged not to be generated, whether the accumulated timing time exceeds the anti-shunt running time or not is judged, if not, whether the pulse signal behavior is generated or not is continuously judged, and if so, the value of a fast pulse counter in the metering chip is immediately cleared.
2. The method for achieving power frequency shunt-wound protection as claimed in claim 1, wherein the preset threshold of current is 20 milliamps.
3. The method for performing power frequency anti-creep of claim 1, further comprising: and if the active power is greater than a preset power threshold, normally running for metering.
4. The method for performing power frequency anti-creep of claim 1, further comprising: if the anti-shunt running time is exceeded, the method also comprises the following steps after the value of the fast pulse counter in the metering chip is immediately cleared:
and triggering the timer again to perform accumulated timing.
5. An electric energy meter, characterized in that the electric energy meter comprises:
the identification module is used for identifying the specification constant of the electric energy meter and calculating the starting power and the starting time of the metering chip according to the specification constant;
the reading module is used for reading current data, active power and pulse signal behaviors in the running process of the electric energy meter;
the first processing module is used for judging whether the current data is smaller than a current preset threshold value or not, and immediately resetting the value of a fast pulse counter in the metering chip if the current data is smaller than the current preset threshold value;
the second processing module is used for judging whether the active power is smaller than a preset power threshold value, wherein the preset power value is 80% of the starting power, and if the active power is smaller than the preset power threshold value, the value of a fast pulse counter in the metering chip is cleared immediately;
the third processing module is used for judging whether pulse signal behaviors exist in the anti-shunt running time, and immediately resetting the value of a fast pulse counter in the metering chip if no pulse is generated in the anti-shunt running time, wherein the anti-shunt running time is 1.1 times of the starting time;
the third processing module triggers a timer to carry out accumulated timing after identifying that the electric energy meter enters the running state; judging whether a pulse signal behavior is generated or not, if so, triggering the accumulated timing on the timer to be cleared, and re-triggering the timer to perform accumulated timing; if the pulse signal behavior is judged not to be generated, whether the accumulated timing time exceeds the anti-shunt running time or not is judged, if not, whether the pulse signal behavior is generated or not is continuously judged, and if so, the value of a fast pulse counter in the metering chip is immediately cleared.
6. The electrical energy meter of claim 5, wherein the predetermined threshold current is 20 milliamps.
7. The electric energy meter according to claim 5, wherein the second processing module operates the metering normally if the active power is greater than a preset power threshold.
8. The electric energy meter according to claim 5, wherein the third processing module triggers the timer again for cumulative timing after the value of the fast pulse counter in the metering chip is cleared immediately after the anti-shunt running time is exceeded.
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