CN112098920B - Testing device, method and system for residual current monitoring function of intelligent electric energy meter - Google Patents

Testing device, method and system for residual current monitoring function of intelligent electric energy meter Download PDF

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Publication number
CN112098920B
CN112098920B CN202010978480.4A CN202010978480A CN112098920B CN 112098920 B CN112098920 B CN 112098920B CN 202010978480 A CN202010978480 A CN 202010978480A CN 112098920 B CN112098920 B CN 112098920B
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electric energy
energy meter
residual current
tested electric
monitoring function
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CN112098920A (en
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肖勇
胡珊珊
罗奕
钱斌
罗鸿轩
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China South Power Grid International Co ltd
China Southern Power Grid Co Ltd
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China South Power Grid International Co ltd
China Southern Power Grid Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • 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

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Abstract

The embodiment of the invention relates to a testing device, a testing method and a testing system for an intelligent electric energy meter residual current monitoring function, which can detect whether the residual current monitoring and alarming function of a tested electric energy meter is normally started or not, can quantitatively and accurately test the residual current monitoring accuracy of the tested electric energy meter, can detect whether the tested electric energy meter can normally set a threshold value or not, can verify whether the tested electric energy meter can normally set the threshold value and can reliably act within the set threshold value range, and ensure that the residual current monitoring and alarming function of the tested electric energy meter normally operates, wherein the testing device, the testing method and the testing system use a program-controlled power source with low-power virtual load to replace high-power real load testing equipment and a testing method, reduce the testing power source requirement and the testing cost, reduce the safety risk of the testing process, and are used for solving the problems that the existing 20 real KW load testing is adopted for the residual current monitoring function of the intelligent electric energy meter, and the load current is large in the testing process, The duration is long, the test process consumes long time, and the safety can not be ensured.

Description

Testing device, method and system for residual current monitoring function of intelligent electric energy meter
Technical Field
The invention relates to the technical field of electric energy meter detection, in particular to a testing device, a testing method and a testing system for an intelligent electric energy meter residual current monitoring function.
Background
With the rapid development of the intelligent electric energy meter technology in recent years, the functions of the intelligent electric energy meter are more and more, wherein the residual current monitoring function is an important new function of the single-phase intelligent electric energy meter. In the technical specification of single-phase intelligent electric energy meter, the electric energy meter is required to have a residual current monitoring function, and the following precision and function requirements are met within the specified temperature and humidity range: 1. when I delta is more than or equal to 10mA and less than or equal to 300mA, the measured residual current deviation is not more than 3 mA; 2. when the I delta is more than 300mA, the measured residual current is equal to or more than 297 mA; 3. the intelligent electric energy meter can record the total times of residual current monitoring alarm events, the latest 10 times of occurrence time, ending time, corresponding electric energy data and other information; 4. the setting range of the residual current alarm set value I delta n is 10 mA-300 mA, and the default is 30 mA; 5. when I delta is less than or equal to 10mA and less than or equal to 300mA and the residual current is greater than I delta n-3mA, the electric energy meter alarms, records an event record and actively reports the event record within 30 s; 6. when I delta is larger than 300mA, the electric energy meter alarms and records an event record, and actively reports the event record within 30 s; 7. under the conditions that the residual currents are 10mA, 30mA, 100mA and 400mA, the residual current measuring accuracy of the electric energy meter meets the requirement; 8. applying same-phase currents 10Itr and Imax to live wire and zero wire loops of the electric energy meter at the same time, keeping for 1min, and keeping the residual current not more than 3 mA; 9. and respectively setting residual current alarm threshold values under the conditions that the residual currents are 10mA, 30mA, 100mA and 400mA, wherein the residual current measurement alarm event records of the electric energy meter meet the requirements.
According to the testing requirement of the residual current monitoring function of the intelligent electric energy meter, the current of 10Itr or Imax is required to be applied to the live wire loop and the zero wire loop of the electric energy meter at the same time and kept for more than 1 min. At present, a traditional testing method is adopted for monitoring the residual current of the intelligent electric energy meter, the testing method needs to set a real load with power consumption more than 20KW in a testing laboratory to meet the testing requirement of the residual current monitoring function of the intelligent electric energy meter, the power supply requirement is difficult to meet in a general electric energy meter detection laboratory, the real load testing process is large in load current and long in duration, and the testing process is relatively wasted and is not safe enough.
Disclosure of Invention
The embodiment of the invention provides a testing device, a testing method and a testing system for an intelligent electric energy meter residual current monitoring function, which are used for solving the technical problems that the existing 20KW real load testing is adopted for the intelligent electric energy meter residual current monitoring function, the load current is large, the duration is long, the testing process consumes long time, and the safety cannot be guaranteed.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a testing device for residual current monitoring function of an intelligent electric energy meter comprises a program-controlled power source, a current detection module, a program-controlled electronic load and an isolation transformer;
the program control power supply is used for providing a tested simulation working current for the tested electric energy meter;
the program-controlled electronic load is used for providing quantitative simulated residual current for the tested electric energy meter;
the current detection module is used for detecting the negative combined current of the zero line and the live line of the tested electric energy meter under the condition that the program-controlled electronic load outputs the simulated residual current;
and the isolation transformer is used for setting the power capacity of the testing device with the intelligent electric energy meter residual current monitoring function according to the maximum current of the tested electric energy meter.
Preferably, be provided with live wire sampling resistor, zero line sampling resistor, voltage circuit sampling resistor and four connection interface on the electric energy meter of being surveyed, four connection interface is first connection interface, second connection interface, third connection interface and fourth connection interface respectively, current detection module respectively with the second connection interface with fourth connection interface connection.
Preferably, if the testing device of the intelligent electric energy meter residual current monitoring function tests one tested electric energy meter, the testing loop of the testing device of the intelligent electric energy meter residual current monitoring function is as follows: the second end of programme-controlled power source respectively with first connection interface with live wire sampling resistor connects, live wire sampling resistor with interface connection is connected to the second, the second connect the interface with the first end of isolation transformer primary winding is connected, the second end of isolation transformer primary winding with fourth connection interface connection, the fourth connection interface with zero line sampling resistor connects, zero line sampling resistor still with interface connection is connected to the third, the third connect the interface with the second end of isolation transformer secondary winding is connected, the first end of isolation transformer secondary winding with the first end of programme-controlled power source is connected.
Preferably, if this intelligent ammeter residual current monitoring function's testing arrangement tests at least three the electric energy meter is surveyed, three the electric energy meter cascade series connection is surveyed, and is three the electric energy meter is surveyed first electric energy meter, second and the electric energy meter is surveyed to the third respectively, and this intelligent ammeter residual current monitoring function's testing arrangement's test loop is:
the second end of the program-controlled power supply is connected with the first connecting interface of the first tested electric energy meter, the second connecting interface of the first tested electric energy meter is connected with the first connecting interface of the second tested electric energy meter, the second connecting interface of the second tested electric energy meter is connected with the first connecting interface of the third tested electric energy meter, the second connecting interface of the third tested electric energy meter is connected with the first end of the primary winding of the isolation transformer, the second end of the primary winding of the isolation transformer is connected with the fourth connecting interface of the third tested electric energy meter, the third connecting interface of the third tested electric energy meter is connected with the fourth connecting interface of the second tested electric energy meter, the third connecting interface of the second tested electric energy meter is connected with the fourth connecting interface of the first tested electric energy meter, and the third connecting interface of the first tested electric energy meter is connected with the second end of the secondary winding of the isolation transformer, the first end of the secondary winding of the isolation transformer is connected with the first end of the program-controlled power source; the first end of the current detection module after being connected with the programmable electronic load is respectively connected with the third connection interface of the first measured electric energy meter and the second end of the secondary winding of the isolation transformer, and the second end of the current detection module after being connected with the programmable electronic load is connected with the first end of the primary winding of the isolation transformer.
Preferably, the testing device for the residual current monitoring function of the intelligent electric energy meter further comprises a serial port communication module and a workstation, wherein an epitope communication module is arranged on the tested electric energy meter, the input end of the serial port communication module is respectively connected with the testing device for the residual current monitoring function of the intelligent electric energy meter and the epitope communication module, and the output end of the serial port communication module is connected with the workstation.
Preferably, the voltage ratio of the primary winding to the secondary winding of the isolation transformer is 1: 1.
The invention also provides a testing method for the residual current monitoring function of the intelligent electric energy meter, which comprises the testing device for the residual current monitoring function of the intelligent electric energy meter, namely a testing device, wherein the testing device is connected with the tested electric energy meter, and the testing method for the residual current monitoring function of the intelligent electric energy meter comprises the following steps:
s1, setting a residual current setting value on the tested electric energy meter according to a residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to a residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
s2, providing a first pure resistive load current 10 for the tested electric energy meter through a program control power source and an isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects initial residual current I of the current instantaneous value vector sum of the detected electric energy meter0Obtaining the first purely resistive load current 10 from the electrical energy meter under testItrAnd the second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
s3, through program controlThe electronic load controls the test loop of the test device to generate the residual current IΔnObtaining the residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetIf so, the accuracy of the residual current measured by the measured electric energy meter is qualified;
s4, clearing alarm statistical data of a residual current monitoring function on the tested electric energy meter, setting an alarm threshold corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain residual current alarm data corresponding to the alarm threshold under the condition of the alarm threshold, the residual current monitoring function of the tested electric energy meter is qualified;
s5, if any step from the step S1 to the step S4 judges that the result of the tested electric energy meter is unqualified, the residual current monitoring and alarming function of the tested electric energy meter is unqualified; if the results of the tested electric energy meter are judged to be qualified in the steps S1 to S4, the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor the upper limit value of the allowable error of the residual current measurement of the tested electric energy meter, IΔsetThe residual current monitoring function comprises a residual current function, an alarm output function, an active reporting function and a residual current alarm function.
Preferably, in steps S1 and S4, the residual current monitoring function includes multiple functions, and only if the residual current monitoring function of each of the multiple functions is tested to be qualified, the residual current monitoring function of the tested electric energy meter is qualified.
The invention also provides a test system of the residual current monitoring function of the intelligent electric energy meter, which comprises the test device of the residual current monitoring function of the intelligent electric energy meter, namely a test device, wherein the test device is connected with the tested electric energy meter;
the first testing module is used for setting a residual current setting value on the tested electric energy meter according to the residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to a residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
the second test module is used for providing a first pure resistive load current 10 for the tested electric energy meter through a program control power supply and an isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects initial residual current I of the current instantaneous value vector sum of the detected electric energy meter0Obtaining the first purely resistive load current 10 from the electrical energy meter under testItrAnd the second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
the third test module is used for controlling a test loop of the test device to generate a residual current I through the program-controlled electronic loadΔnObtaining the residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetIf so, the accuracy of the residual current measured by the measured electric energy meter is qualified;
the fourth testing module is used for clearing alarm statistical data of a residual current monitoring function on the tested electric energy meter, setting an alarm threshold corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain residual current alarm data corresponding to the alarm threshold under the condition of the alarm threshold, the residual current monitoring function of the tested electric energy meter is qualified;
the judging module is used for judging that the result of the tested electric energy meter is unqualified according to any one of the first testing module, the second testing module, the third testing module and the fourth testing module, and the residual current monitoring and alarming functions of the tested electric energy meter are unqualified; judging whether the result of the tested electric energy meter is qualified according to the first test module, the second test module, the third test module and the fourth test module, and if so, judging that the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor the upper limit value of the allowable error of the residual current measurement of the tested electric energy meter, IΔsetThe residual current monitoring function comprises a residual current function, an alarm output function, an active reporting function and a residual current alarm function.
The invention also provides a terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the testing method of the residual current monitoring function of the intelligent electric energy meter according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. the testing device for the residual current monitoring function of the intelligent electric energy meter can accurately simulate and control the residual current generated by the tested electric energy meter and stabilize the duration through the program-controlled power source, the current detection module, the program-controlled electronic load and the isolation transformer, not only can quantitatively test the residual current accuracy of the tested electric energy meter, but also can test whether the residual current monitoring and alarming functions of the tested electric energy meter are reliable or not under the condition of setting a threshold error boundary, and finally ensure the reliable operation of the residual current monitoring and alarming functions of the tested electric energy meter, thereby solving the technical problems that the existing residual current monitoring function of the intelligent electric energy meter adopts 20KW real load test, the load current is larger in the testing process, the duration is longer, the testing process consumes long time and the safety cannot be ensured.
2. The testing method of the residual current monitoring function of the intelligent electric energy meter tests the tested electric energy meter through the testing device of the residual current monitoring function of the intelligent electric energy meter according to the steps S1 to S4, detects whether the residual current monitoring and alarming functions of the tested electric energy meter are normally started, can quantitatively and accurately test the residual current monitoring accuracy of the tested electric energy meter, can detect whether the tested electric energy meter can normally set a threshold value and verify that no misoperation occurs in the set threshold value range and reliable action can be realized, ensures that the residual current monitoring and alarming functions of the tested electric energy meter normally run, uses a program-controlled power source with low-power virtual load to replace high-power real load testing equipment and a testing method, reduces the requirement and the testing cost of a testing power source, reduces the safety risk of the testing process, and solves the problem that the existing residual current monitoring function of the intelligent electric energy meter adopts 20KW real load testing, the load current is large, the duration is long, the test process consumes long time, and the safety can not be ensured.
Drawings
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, and 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 these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a testing device for a residual current monitoring function of an intelligent electric energy meter according to an embodiment of the present invention.
Fig. 2 is a frame diagram of a plurality of tested electric energy meters simultaneously testing the testing device for monitoring the residual current of the intelligent electric energy meter according to the embodiment of the invention.
Fig. 3 is another block diagram of the testing device for residual current monitoring function of the intelligent electric energy meter according to the embodiment of the invention.
Fig. 4 is a flowchart illustrating steps of a method for testing a residual current monitoring function of an intelligent electric energy meter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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 embodiment of the application provides a testing device, a method and a system for an intelligent electric energy meter residual current monitoring function, which can detect whether the residual current monitoring and alarming function of the tested electric energy meter is normally started or not by adopting a virtual load mode, can quantitatively and accurately test the residual current monitoring accuracy of the tested electric energy meter, can detect whether the tested electric energy meter can normally set a threshold value or not and verify that no misoperation occurs in the set threshold value range and reliable action can be realized, and ensure that the residual current monitoring and alarming function of the tested electric energy meter normally operates, the testing device, the method and the system use a program-controlled power source with low-power virtual load to replace a high-power real load testing device and a testing method, reduce the testing power source requirement and the testing cost, reduce the safety risk of the testing process, and are used for solving the problem that the existing 20 real load testing is adopted for the residual current monitoring function of the intelligent electric energy meter, the load current is large, the duration is long, the test process consumes long time, and the safety can not be ensured. In this embodiment, the measured electric energy meter is described by taking an intelligent electric energy meter as a case.
The first embodiment is as follows:
fig. 1 is a schematic circuit diagram of a testing device for a residual current monitoring function of an intelligent electric energy meter according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a testing apparatus for a residual current monitoring function of an intelligent electric energy meter, including a program-controlled power source 10, a current detection module 20, a program-controlled electronic load 30, and an isolation transformer 40;
the program-controlled power supply 10 is used for providing a tested simulated working current for the tested electric energy meter;
the program-controlled electronic load 30 is used for providing quantitative simulated residual current for the tested electric energy meter;
the current detection module 20 is configured to detect a negative combined current of the zero line and the live line of the electric energy meter 50 to be detected under the condition that the program-controlled electronic load 30 outputs the simulated residual current;
and the isolation transformer 40 is used for setting the power capacity of the testing device of the intelligent electric energy meter residual current monitoring function according to the maximum current of the tested electric energy meter.
In the embodiment of the invention, the program-controlled power source 10 mainly provides a simulation working current for testing for the tested electric energy meter, the simulation working current is generally 0-100A, and the simulation working current is adjustable, and the rated power of the program-controlled power source 10 is not less than the maximum current value of the current range of the tested electric energy meter.
It should be noted that the measured electric energy meter is used for monitoring the actual residual current, and the large impedance of the program-controlled electronic load 30 and the measurement range of the measured electric energy meter are configured according to the actual test requirements.
In the embodiment of the present invention, the current detection module 20 is specially used for measuring the magnitude of the zero-live line negative combined current of the tested electric energy meter under various load currents, that is, the residual current zero drift under different load conditions.
It should be noted that the current detection module 20 may be preferably a current detection transformer for monitoring the residual current of the measured electric energy meter.
In the embodiment of the present invention, the programmable electronic load 30 is specifically used for artificially simulating the generation of a quantitative residual current in the load circuit of the tested electric energy meter, so as to simulate the occurrence of the residual current.
In an embodiment of the present invention, the transformer ratio of the isolation transformer 40 is 1:1, rated voltage 220V, the power capacity of the isolation transformer 40 is determined according to the current range of the energy meter to be measured, and the power capacity of the isolation transformer 40 is not less than the maximum current value of the current range of the energy meter to be measured.
It should be noted that the voltage ratio of the primary winding to the secondary winding of the isolation transformer is 1: 1.
The testing device for the residual current monitoring function of the intelligent electric energy meter can accurately simulate and control the residual current generated by the tested electric energy meter and stabilize the duration time through the program-controlled power source, the current detection module, the program-controlled electronic load and the isolation transformer, the residual current accuracy of the tested electric energy meter can be quantitatively tested, the residual current of the tested electric energy meter is zero drift under each balanced load condition, whether the residual current monitoring and alarming functions of the tested electric energy meter can reliably act under the condition of setting a threshold error boundary, the reliable operation of the residual current monitoring and alarming functions of the tested electric energy meter is finally guaranteed, the problem that the existing residual current monitoring function of the intelligent electric energy meter adopts 20KW real load testing is solved, the load current is large in the testing process, the duration is long, and the testing process consumes long time and cannot be safely guaranteed is solved.
In an embodiment of the present invention, a fire line sampling resistor RL, a zero line sampling resistor RN, a voltage loop sampling resistor RU, and four connection interfaces are disposed on the measured electric energy meter, the four connection interfaces are a first connection interface 1, a second connection interface 2, a third connection interface 3, and a fourth connection interface 4, respectively, and the current detection module 20 is connected to the second connection interface 2 and the fourth connection interface 4, respectively.
In this embodiment, if the testing device of the intelligent electric energy meter residual current monitoring function tests an electric energy meter to be tested, as shown in fig. 1, the testing loop of the testing device of the intelligent electric energy meter residual current monitoring function is: the second end of the programmable power source 10 is respectively connected with a first connecting interface 1 and a live wire sampling resistor RL, the live wire sampling resistor RL is connected with a second connecting interface 2, the second connecting interface 2 is connected with the first end of a primary winding of an isolation transformer 40, the second end of the primary winding of the isolation transformer 40 is connected with a fourth connecting interface 4, the fourth connecting interface 4 is connected with a zero line sampling resistor RN, the zero line sampling resistor RN is also connected with a third connecting interface 3, the third connecting interface 3 is connected with the second end of a secondary winding of the isolation transformer 40, and the first end of the secondary winding of the isolation transformer 40 is connected with the first end of the programmable power source 10.
It should be noted that when the testing device of the intelligent electric energy meter residual current monitoring function tests the tested electric energy meter, the voltage signal of the virtual load is connected between the first connection interface 1 and the third connection interface 3 of the tested electric energy meter, so as to maintain the normal work of the tested electric energy meter; the current signal of the virtual load is connected between the first connection interface 1 of the tested electric energy meter and the isolation transformer 40, and the working current can be set randomly in the current output range according to the test requirement. This testing arrangement of intelligent ammeter residual current monitoring function can simulate respectively not have the residual current trouble and have the operational aspect of residual current trouble, needs can control unbalanced current's size simultaneously, inspects the degree of accuracy of being surveyed the ammeter to not equidimension residual current monitoring.
In this embodiment, if the program-controlled electronic load 30 is connected between the second connection interface 2 and the third connection interface 3 of the electric energy meter to be tested, the testing device with the function of monitoring the residual current of the intelligent electric energy meter can artificially generate an unbalanced current between the live wire loop and the zero wire loop, where the unbalanced current is an artificially simulated residual current test signal.
It should be noted that, when the program-controlled electronic load 30 is opened, the test currents in the live wire and the neutral wire of the energy meter to be tested are always balanced, and there is no residual current in the test loop. The testing device for the residual current monitoring function of the intelligent electric energy meter simulates the normal working condition of the tested electric energy meter under the condition of no leakage current, and the normal testing working current of the tested electric energy meter can be adjusted by adjusting the current output of the program control power source 10 in a testing loop. When the programmable electronic load 30 is started, an unbalanced current will appear in the test loop. As shown in fig. 1, when the programmable electronic load 30 is bridged between the second connection interface 2 and the third connection interface 3 of the measured electric energy meter, a part of the working current flowing through the live wire of the measured electric energy meter is shunted by the rest of the measured electric energy meter and the programmable electronic load 30, and then directly returns to the second end of the primary winding of the isolation transformer 40, and at this time, the zero line has a part of current less than the live wire, so that the current of the live wire and the zero line of the measured electric energy meter is unbalanced. The testing device for the residual current monitoring function of the intelligent electric energy meter can ensure that the current value flowing through the residual tested electric energy meter is stabilized to be the leakage current testing value required by testing through precisely adjusting the program-controlled electronic load 30, and the residual current monitoring function of the tested electric energy meter is checked.
In the embodiment of the present invention, if the program-controlled electronic load 30 is bridged between the first connection interface 1 and the fourth connection interface 4 of the measured electric energy meter, the zero line of the measured electric energy meter will generate one more current, so that an imbalance situation is generated between the live line and the zero line of the measured electric energy meter.
Fig. 2 is a frame diagram of a plurality of tested electric energy meters simultaneously testing the testing device for monitoring the residual current of the intelligent electric energy meter according to the embodiment of the invention.
As shown in fig. 2, in an embodiment of the present invention, if the testing device for intelligent electric energy meter residual current monitoring function tests at least three tested electric energy meters, the three tested electric energy meters are connected in series in cascade, the three tested electric energy meters are respectively a first tested electric energy meter, a second tested electric energy meter and a third tested electric energy meter, and a testing loop of the testing device for intelligent electric energy meter residual current monitoring function is as follows:
the second end of the program-controlled power supply 10 is connected with the first connecting interface 1 of the first tested electric energy meter, the second connecting interface 2 of the first tested electric energy meter is connected with the first connecting interface 1 of the second tested electric energy meter, the second connecting interface 2 of the second tested electric energy meter is connected with the first connecting interface 1 of the third tested electric energy meter, the second connecting interface 2 of the third tested electric energy meter is connected with the first end of the primary winding of the isolation transformer 40, the second end of the primary winding of the isolation transformer 40 is connected with the fourth connecting interface 4 of the third tested electric energy meter, the third connecting interface 3 of the third tested electric energy meter is connected with the fourth connecting interface 4 of the second tested electric energy meter, the third connecting interface 3 of the second tested electric energy meter is connected with the fourth connecting interface 4 of the first tested electric energy meter, the third connecting interface 3 of the first tested electric energy meter is connected with the second end of the secondary winding of the isolation transformer 40, a first end of the secondary winding of the isolation transformer 40 is connected with a first end of the programmable power source 10; the first end of the current detection module 20 connected with the programmable electronic load 30 is connected with the third connection interface 3 of the first measured electric energy meter and the second end of the secondary winding of the isolation transformer 40, and the second end of the current detection module 20 connected with the programmable electronic load 30 is connected with the first end of the primary winding of the isolation transformer 40.
It should be noted that, in this embodiment, when a plurality of electric energy meters to be tested need to be tested simultaneously, the plurality of electric energy meters to be tested may be cascaded and connected in series, and the real load test mode of the test device for the intelligent electric energy meter residual current monitoring function may also satisfy the requirement of simultaneously testing the plurality of electric energy meters to be tested. The multiple tested electric energy meter test loops are specifically voltage signals of the program-controlled power source 10 connected to the first tested electric energy meter. The high end of the voltage source of the program-controlled power source 10 is connected with the first connection interface 1 of the first tested electric energy meter, and the low end of the voltage source of the program-controlled power source 10 is connected with the third connection interface 3 of the first tested electric energy meter. The first connecting interfaces 1 of all the epitopes are connected through the equivalent resistance of the live wire of the tested electric energy meter, and the third connecting interfaces 3 are connected through the equivalent resistance of the zero line return of the tested electric energy meter, so that all the tested electric energy meters can be normally powered on. Meanwhile, the voltage signal is also connected to two ends of the primary winding of the isolation transformer 40 through the measured electric energy meter, and an equivalent voltage signal is also generated at two ends of the secondary winding of the isolation transformer 40 with the voltage ratio of 1: 1. In the test loop, the program-controlled power supply 10 provides a working test environment for the tested electric energy meter; the program-controlled electronic load 30 simulates a residual current test signal; the current detection module 20 is used for testing the magnitude of the simulated residual current so as to compare the magnitude with the result of the table test.
Fig. 3 is another block diagram of the testing device for residual current monitoring function of the intelligent electric energy meter according to the embodiment of the invention.
As shown in fig. 3, in an embodiment of the present invention, the testing device for the residual current monitoring function of the intelligent electric energy meter further includes a serial communication module 50 and a workstation 60, the tested electric energy meter is provided with an epitope communication module, an input end of the serial communication module 50 is connected to the testing device for the residual current monitoring function of the intelligent electric energy meter and the epitope communication module respectively, and an output end of the serial communication module 50 is connected to the workstation 60.
It should be noted that the communication service of the testing device for monitoring the residual current of the intelligent electric energy meter is undertaken by the CL2018 serial communication server as the serial communication module 50, and the serial communication module 50 communicates with the program-controlled power source 10, the current detection module 20 and the program-controlled electronic load 30 through 485 serial ports; and the serial communication with the tested electric energy meter is realized through the multifunctional Bluetooth module. The testing device for the intelligent ammeter residual current monitoring function can set the working current of the program-controlled power supply 10 and the resistance value of the program-controlled electronic load 30 through instructions, and can realize the inspection of the residual current monitoring accuracy of the tested ammeter under different measuring ranges. The workstation is a high-end general-purpose microcomputer, and is an information processing system formed from computer and correspondent external equipment and complete set of application software package. In this embodiment, the serial communication module 50 may select an RS485 communication technology, a narrowband carrier communication technology, a wideband carrier communication technology, a micropower technology, a bluetooth communication technology, an LoRa wireless communication technology, an optical fiber ethernet communication technology, an NB-IoT wireless communication technology, a wireless M-Bus communication technology, a combination of the above technologies, and the like, where the test device for the residual current monitoring function of the intelligent electric energy meter is required to pass safety certification in the wireless communication mode to ensure the test safety.
Example two:
fig. 4 is a flowchart illustrating steps of a method for testing a residual current monitoring function of an intelligent electric energy meter according to an embodiment of the present invention.
As shown in fig. 4, an embodiment of the present invention further provides a method for testing a residual current monitoring function of an intelligent electric energy meter, where the method includes the following steps:
s1, setting a residual current setting value on a tested electric energy meter according to a residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to the residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
s2, providing a first pure resistive load current 10 for the tested electric energy meter through the program control power source and the isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects initial residual current I of the current instantaneous value vector sum of the detected electric energy meter0Obtaining a first purely resistive load current 10 from the electrical energy meter under testItrAnd a second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
s3, controlling a test loop of the test device to generate a residual current I through the program-controlled electronic loadΔnObtaining residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetThe accuracy of the residual current measured by the measured electric energy meter is qualified;
s4, clearing alarm statistical data of the residual current monitoring function on the tested electric energy meter, setting an alarm threshold corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain the residual current alarm data corresponding to the alarm threshold under the condition of the alarm threshold, the residual current monitoring function of the tested electric energy meter is qualified;
s5, if any one of the steps S1 to S4 judges that the result of the tested electric energy meter is unqualified, the residual current monitoring and alarming functions of the tested electric energy meter are unqualified; if the results of the tested electric energy meter are judged to be qualified in the steps S1 to S4, the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor measuring the upper limit value of the allowable error of the residual current of the electric energy meter to be measured, IΔsetThe residual current monitoring function comprises a residual current function, an alarm output function, an active reporting function and a residual current alarm function.
In the embodiment of the present invention, step S1 is mainly used for testing the residual current monitoring and alarm function starting setting of the measured electric energy meter.
Sending a function starting mode word (residual current function), an alarm output configuration mode word (adopting residual current overrun to represent the alarm output function), an active reporting mode word (adopting residual current overrun to represent the active reporting function) and a residual current setting value of a write instruction of a residual current alarm setting threshold value (residual current alarm function) to the tested electric energy meter, and then reading an actual setting value of a corresponding function parameter of the tested electric energy meter; comparing the actual residual current value of each function with the set residual current value set in the writing instruction of the corresponding function, and if the actual residual current value of each function is consistent with the set residual current value, indicating that the starting setting of the function of the tested electric energy meter is qualified; only if the set start of the tested electric energy meter with each function is qualified, the set start of the residual current monitoring and alarming function of the tested electric energy meter can be judged to be qualified. And if the opening setting of the tested electric energy meter with one or more functions is not qualified, judging that the residual current monitoring and alarm function opening setting function of the tested electric energy meter is not qualified.
In step S2 of the embodiment of the present invention, the method is mainly used for testing the residual current zero drift of the tested electric energy meter under each balanced load condition, if | I |Δ1-I0|>IΔsetAnd | IΔ2-I0|≤IΔset、|IΔ1-I0|≤IΔsetAnd | IΔ2-I0|>IΔsetOr | IΔ1-I0|>IΔseAnd | IΔ2-I0|>IΔsetIn the three conditions, the monitoring function that the residual current of the tested electric energy meter does not exceed 3mA is not qualified.
In step S3 of the embodiment of the present invention, the method is mainly used for testing the accuracy of the residual current of the measured electric energy meter. I isΔnsetThe upper limit value (3mA) of the allowable error of the residual current measurement of the tested ammeter and the residual current IΔnCan be any one of 10mA, 30mA, 100mA and 400mA, if the residual current IΔnIs 10mA. Testing | I in any one of 30mA, 100mA and 400mAΔn'-IΔn|>IΔnsetAnd the accuracy of the residual current measured by the measured electric energy meter is not qualified.
In step S4 of the embodiment of the present invention, the method is mainly used for testing the functions of monitoring the residual current of the measured electric energy meter, recording an alarm event, and actively reporting. Specifically, reset operation is carried out on the total number of residual current monitoring alarm events of the tested electric energy meter and the effective information (namely the alarm statistical data of the residual current alarm function) recorded In the last 1 residual current monitoring alarm events, the running state word 1 of the electric meter (the alarm output function is represented by the residual current overrun) and the active reporting state word (the active reporting function is represented by the residual current overrun), and the alarm threshold value parameters of the residual current of the tested electric energy meter are set to In sequenceΔset(e.g., 10mA, 30mA, 100mA, 300mA), and the residual current alarm determination time threshold is set to be delta IsetControlling the size of the program-controlled electronic load 30 to make the circuit of the energy meter to be tested generate corresponding residual current IΔnAnd maintain at least Δ IsetReading the total number of residual current monitoring alarm events of the tested electric energy meter, the effective information of the last 1 residual current monitoring alarm event record, the electric meter running state word 1 and the active reporting state word under the corresponding residual current respectively when the time (such as 10mA, 30mA, 100mA and 400mA) is required; and if the residual current alarm data can be correctly read under all the tested residual currents, judging that the residual current monitoring function of the tested electric energy meter is qualified if the residual current alarm data is consistent with the alarm threshold value, and otherwise, judging that the residual current monitoring function is unqualified.
In the embodiment of the present invention, in steps S1 and S4, the residual current monitoring function includes multiple functions, and only if the residual current monitoring function of each of the multiple functions is tested to be qualified, the residual current monitoring function of the electrical energy meter to be tested is qualified.
It should be noted that, if one of the functions of testing the residual current monitoring function is not qualified, it indicates that the residual current monitoring function of the tested electric energy meter is not qualified.
The invention provides a testing method of the residual current monitoring function of an intelligent electric energy meter, which tests the tested electric energy meter through a testing device of the residual current monitoring function of the intelligent electric energy meter according to the steps S1 to S4, detects whether the residual current monitoring and alarming functions of the tested electric energy meter are normally started, can quantitatively and accurately test the residual current monitoring accuracy of the tested electric energy meter, can detect whether the tested electric energy meter can normally set a threshold value and verify that no misoperation occurs in the set threshold value range and the reliable action can be realized, and ensures the normal operation of the residual current monitoring and alarming functions of the tested electric energy meter, the testing device uses a program-controlled power source with small-power virtual load to replace a high-power real load testing device and a testing method, reduces the requirements of a testing power source and the testing cost, reduces the safety risk of the testing process, and solves the problem that the existing 20KW real load testing is adopted for the residual current monitoring function of the intelligent electric energy meter, the load current is large, the duration is long, the test process consumes long time, and the safety can not be ensured.
Example three:
the embodiment of the invention also provides a testing system for the residual current monitoring function of the intelligent electric energy meter, which comprises the testing device for the residual current monitoring function of the intelligent electric energy meter, namely the testing device, wherein the testing device is connected with the tested electric energy meter;
the first testing module is used for setting a residual current setting value on the tested electric energy meter according to the residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to the residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
a second test module for providing a first pure resistive load current 10 to the electric energy meter to be tested through the programmable power supply and the isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects initial residual current I of the current instantaneous value vector sum of the detected electric energy meter0Obtaining a first purely resistive load current 10 from the electrical energy meter under testItrAnd a second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
a third test module for controlling the test circuit of the test device to generate residual current I by the program-controlled electronic loadΔnObtaining residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetThe accuracy of the residual current measured by the measured electric energy meter is qualified;
the fourth testing module is used for resetting the alarm statistical data of the residual current monitoring function on the tested electric energy meter, setting an alarm threshold value corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain the residual current alarm data corresponding to the alarm threshold value under the condition of the alarm threshold value, the residual current monitoring function of the tested electric energy meter is qualified;
the judging module is used for judging that the result of the tested electric energy meter is unqualified according to any one of the first testing module, the second testing module, the third testing module and the fourth testing module, and the residual current monitoring and alarming functions of the tested electric energy meter are unqualified; judging whether the result of the tested electric energy meter is qualified according to the first test module, the second test module, the third test module and the fourth test module, and judging whether the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor measuring the upper limit value of the allowable error of the residual current of the electric energy meter to be measured, IΔsetThe residual current monitoring function comprises a residual current function, an alarm output function, an active reporting function and a residual current alarm function.
It should be noted that the modules in the third system of the embodiment and the steps in the second method of the embodiment are correspondingly arranged, the steps in the two-pair method of the embodiment have already been described in detail, and the modules in the third system of the embodiment are not described one by one here.
Example four:
the embodiment of the present invention further provides a terminal device, which is characterized by comprising a processor and a memory:
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the testing method of the residual current monitoring function of the intelligent electric energy meter according to the instructions in the program codes.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing certain functions, the instruction segments describing the execution of a computer program in a device.
The device may be a computing device such as a desktop computer, a notebook, a palm top computer, a cloud server, and the like. The device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the computer device, such as a hard disk or a memory of the computer device. The memory may also be an external storage device of the computer device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the computer device. Further, the memory may also include both internal and external storage units of the computer device. The memory is used for storing computer programs and other programs and data required by the computer device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. The testing device for the residual current monitoring function of the intelligent electric energy meter is characterized by comprising a program-controlled power source, a current detection module, a program-controlled electronic load and an isolation transformer, wherein the tested electric energy meter is respectively connected with the isolation transformer, the program-controlled power source, the program-controlled electronic load and the current detection module;
the program control power supply is used for providing a tested simulation working current for the tested electric energy meter;
the program-controlled electronic load is used for providing quantitative simulated residual current for the tested electric energy meter;
the current detection module is used for detecting the negative combined current of the zero line and the live line of the tested electric energy meter under the condition that the program-controlled electronic load outputs the simulated residual current;
the isolation transformer is used for setting the power capacity of the testing device with the intelligent electric energy meter residual current monitoring function according to the maximum current of the tested electric energy meter;
the tested electric energy meter is provided with a live wire sampling resistor, a zero line sampling resistor, a voltage loop sampling resistor and four connecting interfaces, the four connecting interfaces are respectively a first connecting interface, a second connecting interface, a third connecting interface and a fourth connecting interface, and the current detection module is respectively connected with the second connecting interface and the fourth connecting interface;
if the testing device of the intelligent electric energy meter residual current monitoring function tests one tested electric energy meter, the testing loop of the testing device of the intelligent electric energy meter residual current monitoring function is as follows: the second end of programme-controlled power source respectively with first connection interface with live wire sampling resistor connects, live wire sampling resistor with interface connection is connected to the second, the second connect the interface with the first end of isolation transformer primary winding is connected, the second end of isolation transformer primary winding with fourth connection interface connection, the fourth connection interface with zero line sampling resistor connects, zero line sampling resistor still with interface connection is connected to the third, the third connect the interface with the second end of isolation transformer secondary winding is connected, the first end of isolation transformer secondary winding with the first end of programme-controlled power source is connected.
2. The testing device for the residual current monitoring function of the intelligent electric energy meter is characterized by comprising a program-controlled power source, a current detection module, a program-controlled electronic load and an isolation transformer, wherein the tested electric energy meter is respectively connected with the isolation transformer, the program-controlled power source, the program-controlled electronic load and the current detection module;
the program control power supply is used for providing a tested simulation working current for the tested electric energy meter;
the program-controlled electronic load is used for providing quantitative simulated residual current for the tested electric energy meter;
the current detection module is used for detecting the negative combined current of the zero line and the live line of the tested electric energy meter under the condition that the program-controlled electronic load outputs the simulated residual current;
the isolation transformer is used for setting the power capacity of the testing device with the intelligent electric energy meter residual current monitoring function according to the maximum current of the tested electric energy meter;
the tested electric energy meter is provided with a live wire sampling resistor, a zero line sampling resistor, a voltage loop sampling resistor and four connecting interfaces, the four connecting interfaces are respectively a first connecting interface, a second connecting interface, a third connecting interface and a fourth connecting interface, and the current detection module is respectively connected with the second connecting interface and the fourth connecting interface;
if this testing arrangement of intelligent ammeter residual current monitoring function tests at least three the electric energy meter is surveyed, it is three the electric energy meter cascade series connection is surveyed, it is three the electric energy meter is surveyed for first electric energy meter, second electric energy meter and third electric energy meter to be surveyed respectively, and this testing arrangement of intelligent ammeter residual current monitoring function's test loop is:
the second end of the program-controlled power supply is connected with the first connecting interface of the first tested electric energy meter, the second connecting interface of the first tested electric energy meter is connected with the first connecting interface of the second tested electric energy meter, the second connecting interface of the second tested electric energy meter is connected with the first connecting interface of the third tested electric energy meter, the second connecting interface of the third tested electric energy meter is connected with the first end of the primary winding of the isolation transformer, the second end of the primary winding of the isolation transformer is connected with the fourth connecting interface of the third tested electric energy meter, the third connecting interface of the third tested electric energy meter is connected with the fourth connecting interface of the second tested electric energy meter, the third connecting interface of the second tested electric energy meter is connected with the fourth connecting interface of the first tested electric energy meter, and the third connecting interface of the first tested electric energy meter is connected with the second end of the secondary winding of the isolation transformer, the first end of the secondary winding of the isolation transformer is connected with the first end of the program-controlled power source; the first end of the current detection module after being connected with the programmable electronic load is respectively connected with the third connection interface of the first measured electric energy meter and the second end of the secondary winding of the isolation transformer, and the second end of the current detection module after being connected with the programmable electronic load is connected with the first end of the primary winding of the isolation transformer.
3. The testing device for the residual current monitoring function of the intelligent electric energy meter according to claim 1 or 2, characterized by further comprising a serial communication module and a workstation, wherein the tested electric energy meter is provided with an epitope communication module, the input end of the serial communication module is respectively connected with the testing device for the residual current monitoring function of the intelligent electric energy meter and the epitope communication module, and the output end of the serial communication module is connected with the workstation.
4. The testing device for the residual current monitoring function of the intelligent electric energy meter according to claim 1 or 2, wherein the voltage ratio of the primary winding to the secondary winding of the isolation transformer is 1: 1.
5. A testing method for the residual current monitoring function of an intelligent electric energy meter is characterized by comprising the testing device for the residual current monitoring function of the intelligent electric energy meter, namely a testing device, as claimed in claim 3, wherein the testing device is connected with the tested electric energy meter, and the testing method for the residual current monitoring function of the intelligent electric energy meter comprises the following steps:
s1, setting a residual current setting value on the tested electric energy meter according to a residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to a residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
s2, providing a first pure resistive load current 10 for the tested electric energy meter through a program control power source and an isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects initial residual current I of the current instantaneous value vector sum of the detected electric energy meter0Obtaining the first purely resistive load current 10 from the electrical energy meter under testItrAnd the second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
s3, controlling a test loop of the test device to generate a residual current I through the program-controlled electronic loadΔnObtaining the residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetIf so, the accuracy of the residual current measured by the measured electric energy meter is qualified;
s4, clearing alarm statistical data of a residual current monitoring function on the tested electric energy meter, setting an alarm threshold corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain residual current alarm data corresponding to the alarm threshold under the condition of the alarm threshold, the residual current monitoring function of the tested electric energy meter is qualified;
s5, if any step from the step S1 to the step S4 judges that the result of the tested electric energy meter is unqualified, the residual current monitoring and alarming function of the tested electric energy meter is unqualified; if the results of the tested electric energy meter are judged to be qualified in the steps S1 to S4, the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor the upper limit value of the allowable error of the residual current measurement of the tested electric energy meter, IΔsetThe residual current monitoring function comprises a residual current function, an alarm output function, an active reporting function and a residual current alarm function.
6. The method for testing the residual current monitoring function of the intelligent ammeter as claimed in claim 5, wherein at steps S1 and S4, the residual current monitoring function comprises a plurality of functions, and the residual current monitoring function of the ammeter to be tested is qualified only if the residual current monitoring function of each of the functions is qualified.
7. A testing system for the residual current monitoring function of an intelligent electric energy meter is characterized by comprising the testing device for the residual current monitoring function of the intelligent electric energy meter, namely a testing device according to claim 3, wherein the testing device is connected with the tested electric energy meter and comprises a first testing module, a second testing module, a third testing module, a fourth testing module and a judging module;
the first testing module is used for setting a residual current setting value on the tested electric energy meter according to the residual current monitoring function of the tested electric energy meter; detecting an actual residual current value corresponding to a residual current monitoring function on the tested electric energy meter through the testing device, wherein if the set residual current value is consistent with the actual residual current value, the residual current monitoring function of the tested electric energy meter is qualified;
the second test module is used for providing a first pure resistive load current 10 for the tested electric energy meter through a program control power supply and an isolation transformerItrAnd a second purely resistive load current ImaxThe current detection module detects the current instantaneous value vector sum of the detected electric energy meterInitial residual current I of0Obtaining the first purely resistive load current 10 from the electrical energy meter under testItrAnd the second purely resistive load current ImaxCorresponding first residual current IΔ1And a second residual current IΔ2If IΔ1-I0|≤IΔsetAnd | IΔ2-I0|≤IΔsetIf the residual current of the tested electric energy meter does not exceed 3mA, the monitoring function is qualified;
the third test module is used for controlling a test loop of the test device to generate a residual current I through the program-controlled electronic loadΔnObtaining the residual current I from the measured electric energy meterΔnCorresponding third residual current IΔn'If IΔn'-IΔn|≤IΔnsetIf so, the accuracy of the residual current measured by the measured electric energy meter is qualified;
the fourth testing module is used for clearing alarm statistical data of a residual current monitoring function on the tested electric energy meter, setting an alarm threshold corresponding to the residual current monitoring function through the testing device, and if the tested electric energy meter can obtain residual current alarm data corresponding to the alarm threshold under the condition of the alarm threshold, the residual current monitoring function of the tested electric energy meter is qualified;
the judging module is used for judging that the result of the tested electric energy meter is unqualified according to any one of the first testing module, the second testing module, the third testing module and the fourth testing module, and the residual current monitoring and alarming functions of the tested electric energy meter are unqualified; judging whether the result of the tested electric energy meter is qualified according to the first test module, the second test module, the third test module and the fourth test module, and if so, judging that the residual current monitoring and alarming functions of the tested electric energy meter are qualified;
wherein, IΔnsetFor the upper limit value of the allowable error of the residual current measurement of the tested electric energy meter, IΔsetThe residual current monitoring function comprises a residual current function and an alarmThe device comprises an output function, an active reporting function and a residual current alarm function.
8. A terminal device, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the testing method of the residual current monitoring function of the intelligent electric energy meter according to the instructions in the program codes.
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