Error test system and method for micro-integrated metering switch

Abstract

The error testing system comprises an electric energy meter calibrating device, a standard electric energy meter, a Bluetooth communication unit, an electric quantity collecting and processing unit and the micro-integrated metering switch. According to the electric energy meter calibrating device, a standard electric energy meter and a micro-integrated metering switch are connected in series in a loop; the electric quantity acquisition and processing unit is connected with the micro-integrated metering switch through the Bluetooth communication unit, is connected with a standard electric energy meter through an RS232 interface, and is used for acquiring the accumulated electric quantity of the micro-integrated metering switch and the standard electric energy meter; the electric quantity collecting and processing unit constructs an energy conservation equation according to the accumulated electric quantity of the standard electric energy meter and the micro-set type metering switch in a certain time period to solve errors of the micro-set type metering switch under different current load points. According to the invention, the problem that the existing electric energy meter calibrating device cannot calibrate the micro-integrated metering switch at present is effectively solved. The method is novel and unique in conception, the implementation scheme is specific and practical, and the method has good use value.

Description

Technical Field

[0001] The invention belongs to the technical field of metering, and in particular relates to an error testing system and method for a micro-collective metering switch. Background Art

[0002] Micro-collective metering switch integrates the functions of energy meter and switch, and integrates metering, sensing, communication, control, protection and other functions into a single device, realizing a high degree of integration of equipment functions. It can replace photovoltaic grid-connected switches, energy meter external miniature circuit breakers, intelligent measuring switches, low-voltage monitoring terminals, communication protocol converters and other equipment that are constantly added for a certain business, which can reduce a large amount of repeated investment in public utility infrastructure and help maximize the benefits of social public service resources. It can be seen that micro-collective metering switches are ultimately involved in trade settlements. Therefore, in order to ensure the fairness and justice of trade settlements, it is necessary to calibrate micro-collective metering switches to ensure the accuracy and reliability of their values.

[0003] At present, the use of electric energy meter calibration devices to calibrate micro-collective metering switches will have the following problems: Since the electric energy meter part of the micro-collective metering switch has eliminated the traditional electric energy meter optical pulse signal and low-voltage auxiliary terminal row signals such as electric pulse signal, RS485 communication signal, second pulse signal, etc. in structure, and the existing electric energy meter calibration device collects the photoelectric pulse signal of the electric energy meter being tested or the level signal output by its low-voltage auxiliary terminal row to realize the error calibration of the electric energy meter under different current load points. Therefore, it can be seen that the use of existing electric energy meter calibration devices cannot realize the calibration of micro-collective metering switches. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an error testing system and method for a micro-collective metering switch, which can calibrate the micro-collective metering switch and ensure the accuracy and uniformity of the traceability of the micro-collective metering switch value.

[0005] The present invention is achieved in that:

[0006] An error test system for a micro-collective metering switch comprises: an electric energy meter calibration device, a standard electric energy meter, a Bluetooth communication unit, an electric energy collection and processing unit and a micro-collective metering switch;

[0007] The electric energy meter verification device connects the standard electric energy meter and the micro-collective metering switch in series in a loop;

[0008] The power collection and processing unit is connected to the micro-collective metering switch via the Bluetooth communication unit, and the power collection and processing unit is connected to the standard electric energy meter via the RS232 interface, so as to collect the accumulated power of the micro-collective metering switch and the standard electric energy meter;

[0009] The power collection processing unit constructs an energy conservation equation based on the accumulated power of the standard power meter and the micro-collective metering switch within a certain period of time to solve the error of the micro-collective metering switch at different current load points.

[0010] A method for error testing of a micro-collective metering switch, using the error testing system of the micro-collective metering switch as described above, comprises the following steps:

[0011] Step 1: First install the micro-collective metering switch to be calibrated on each meter position of the energy meter verification device. At this time, the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit. Therefore, in theory, the accumulated electricity value of the standard energy meter at different current load points is consistent with the accumulated electricity value of each micro-collective metering switch;

[0012] Step 2: Before the electric energy meter verification device outputs different current load points, the electric energy collection and processing unit first reads the current electric energy value through the RS232 interface line connected to the standard electric energy meter and records it as y(i); the electric energy collection and processing unit reads the current electric energy value of each micro-collective metering switch on the electric energy meter verification device through the Bluetooth communication unit and records it as φ1(i)...φ n (i), where 1...n represents the meter position number of the micro-collective metering switch installed on the electric energy meter verification device, 1 represents the meter position No. 1, and n represents the meter position No. n;

[0013] Step 3: According to the current point required for calibration, let the electric energy meter calibration device be operated for a period of time T i After a fixed current output is maintained, the current output is disconnected. At this time, the power acquisition processing unit reads the current power value of the standard power meter again and records it as y(j); the power acquisition processing unit reads the current power value of each micro-collective metering switch and records it as φ1(j)...φ n (j); the accumulated electricity value of the standard electric energy meter during this period is:

[0014] y=y(j)-y(i)(1)

[0015] During this time period, the accumulated power value of each micro-collective metering switch is φ1...φ n for:

[0016] φ1=φ1(j)-φ1(i)

[0017] φ n =φ n (j)-φ n (i) (2);

[0018] Step 4: Since the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit, and the energy meter itself has inherent errors, the energy meter verification device will also have certain losses when testing the micro-collective metering switch, and the entire energy meter verification device itself has certain fixed losses; Based on the above information, the following mathematical relationship is established using the energy conservation equation:

[0019] n×the accumulated electricity of the standard electric energy meter = the sum of the accumulated electricity values ​​of all micro-collective metering switches + the fixed loss of the electric energy meter calibration device line + the fixed loss of the electric energy meter calibration device itself;

[0020]

[0021] y represents the accumulated electricity of the standard electric energy meter within the time period; φ n Represents the accumulated electricity of each micro-collective metering switch; ε j Represents the relative error of each micro-collective metering switch at a certain fixed current load point; ε y Represents the line loss rate of the electric energy meter verification device; ε0 represents the fixed loss of the electric energy meter verification device itself;

[0022] Step 5: By changing T i The accumulated electricity value of the standard electric energy meter and the micro-collective metering switch can be continuously obtained over time, and the obtained data is substituted into formula (3) for calculation and solution, so as to calculate the error value of each micro-collective metering switch under the current load current.

[0023] Furthermore, it also includes:

[0024] Step 6: To obtain the error value of the micro-collective metering switch at other load current points, just let the electric energy meter calibration device output the output according to the required load current point, and then repeat steps 1 and 5 to achieve the error test of the micro-collective metering switch at different load current points.

[0025] The advantages of the present invention are: by establishing a relationship between the energy conservation of the standard electric energy meter and the micro-collective metering switch, and using this relationship to calculate the error of the micro-collective metering switch, the problem that the existing electric energy meter calibration device cannot calibrate the micro-collective metering switch is effectively solved. The present invention is novel and unique in concept, and the implementation scheme is specific and practical, and has good use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0027] Figure 1 It is a circuit principle block diagram of the present invention. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, an error test system for a micro-collective metering switch includes: an electric energy meter calibration device, a standard electric energy meter, a Bluetooth communication unit, and an electric quantity collection and processing unit; the electric energy meter calibration device connects the standard electric energy meter and the micro-collective metering switch in series in a loop, and the electric quantity collection and processing unit collects the accumulated electric quantity of the micro-collective metering switch and the standard electric energy meter through the Bluetooth communication unit and the RS232 interface respectively. The electric quantity collection and processing unit constructs an energy conservation equation based on the accumulated electric quantity of the standard electric energy meter and the micro-collective metering switch in a certain period of time to solve the error of the micro-collective metering switch at different current load points.

[0029] The steps for calibrating the micro-collector metering switch in this system are as follows:

[0030] Step 1: First install the micro-collective metering switch to be calibrated on each meter position of the energy meter verification device. At this time, the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit. Therefore, in theory, the accumulated electricity value of the standard energy meter at different current load points is consistent with the accumulated electricity value of each micro-collective metering switch (ignoring the error);

[0031] Step 2: Before the electric energy meter verification device outputs different current load points, the electric energy collection and processing unit first reads the current electric energy value through the RS232 line connected to the standard electric energy meter and records it as y(i); the electric energy collection and processing unit reads the current electric energy value of each micro-collective metering switch on the electric energy meter verification device through the Bluetooth communication unit and records it as φ1(i)...φ n (i), where 1...n represents the meter position number of the micro-collective metering switch installed on the electric energy meter calibration device (1 represents the first meter position, and n represents the nth meter position);

[0032] Step 3: According to the current point required for calibration, let the electric energy meter verification device be operated for a period of time (the time period is set as T i ) After maintaining a fixed current output, the current output is disconnected. At this time, the power acquisition processing unit reads the current power value of the standard power meter again and records it as y(j); the power acquisition processing unit reads the current power value of each micro-collective metering switch and records it as φ1(j)...φ n (j). The accumulated electricity value of the standard electric energy meter during this period is:

[0033] y=y(j)-y(i)(1)

[0034] During this time period, the accumulated power value of each micro-collective metering switch is φ1...φ n for:

[0035] φ1=φ1(j)-φ1(i)

[0036]

[0037] Step 4: Since the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit, and the energy meter itself has inherent errors, the energy meter verification device will also have certain losses when testing the micro-collective metering switch, and the entire energy meter verification device itself has certain fixed losses; Based on the above information, the following mathematical relationship is established using the energy conservation equation:

[0038] n×the accumulated electricity of the standard electric energy meter = the sum of the accumulated electricity values ​​of all micro-collective metering switches + the fixed loss of the electric energy meter calibration device line + the fixed loss of the electric energy meter calibration device itself;

[0039]

[0040] y represents the accumulated electricity of the standard electric energy meter within the time period; φ n Represents the accumulated electricity of each micro-collective metering switch; ε j Represents the relative error of each micro-collective metering switch at a certain fixed current load point; ε y Represents the line loss rate of the electric energy meter verification device; ε0 represents the fixed loss of the electric energy meter verification device itself;

[0041] Step 5: By changing the time length, the accumulated power values ​​of the standard energy meter and the micro-collective metering switch can be continuously obtained, and the obtained data is substituted into formula (3) for calculation and solution, so as to calculate the error value of each micro-collective metering switch under the current load current;

[0042] Step 6: To obtain the error value of the micro-collective metering switch at other load current points, just let the electric energy meter calibration device output the output according to the required load current point, and then repeat steps 1 and 5 to achieve the error test of the micro-collective metering switch at different load current points.

[0043] The advantages of the present invention are: by establishing a relationship between the energy conservation of the standard electric energy meter and the micro-collective metering switch, and using this relationship to calculate the error of the micro-collective metering switch, the problem that the existing electric energy meter calibration device cannot calibrate the micro-collective metering switch is effectively solved. The present invention is novel and unique in concept, and the implementation scheme is specific and practical, and has good use value.

[0044] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. An error test system for a micro-collective metering switch, characterized in that: include: Electric energy meter calibration device, standard electric energy meter, Bluetooth communication unit, power collection and processing unit and micro-collective metering switch; The electric energy meter verification device connects the standard electric energy meter and the micro-collective metering switch in series in a loop; The power collection and processing unit is connected to the micro-collective metering switch via the Bluetooth communication unit, and the power collection and processing unit is connected to the standard electric energy meter via the RS232 interface, so as to collect the accumulated power of the micro-collective metering switch and the standard electric energy meter; The power collection processing unit constructs an energy conservation equation based on the accumulated power of the standard power meter and the micro-collective metering switch within a certain period of time to solve the error of the micro-collective metering switch at different current load points.

2. A method for error testing of a micro-collective metering switch, characterized in that: The error testing system of the micro-collective metering switch according to claim 1 comprises the following steps: Step 1: First install the micro-collective metering switch to be calibrated on each meter position of the energy meter verification device. At this time, the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit. Therefore, in theory, the accumulated electricity value of the standard energy meter at different current load points is consistent with the accumulated electricity value of each micro-collective metering switch; Step 2: Before the electric energy meter verification device outputs different current load points, the electric energy collection and processing unit first reads the current electric energy value through the RS232 interface line connected to the standard electric energy meter and records it as y(i); the electric energy collection and processing unit reads the current electric energy value of each micro-collective metering switch on the electric energy meter verification device through the Bluetooth communication unit and records it as φ1(i)...φ n (i), where 1...n represents the meter position number of the micro-collective metering switch installed on the electric energy meter verification device, 1 represents the meter position No. 1, and n represents the meter position No. n; Step 3: According to the current point required for calibration, let the electric energy meter calibration device be operated for a period of time T i After a fixed current output is maintained, the current output is disconnected. At this time, the power acquisition processing unit reads the current power value of the standard power meter again and records it as y(j); the power acquisition processing unit reads the current power value of each micro-collective metering switch and records it as φ1(j)...φ n (j); the accumulated electricity value of the standard electric energy meter during this period is: y=y(j)-y(i)(1) During this time period, the accumulated power value of each micro-collective metering switch is φ1...φ n for: φ1=φ1(j)-φ1(i) f n =φ n (j)-φ n (i)(2); Step 4: Since the standard energy meter on the energy meter verification device is actually connected in series with each micro-collective metering switch in the entire test circuit, and the energy meter itself has inherent errors, the energy meter verification device will also have certain losses when testing the micro-collective metering switch, and the entire energy meter verification device itself has certain fixed losses; Based on the above information, the following mathematical relationship is established using the energy conservation equation: n×the accumulated electricity of the standard electric energy meter = the sum of the accumulated electricity values ​​of all micro-collective metering switches + the fixed loss of the electric energy meter calibration device line + the fixed loss of the electric energy meter calibration device itself; y represents the accumulated electricity of the standard electric energy meter within the time period; φ n Represents the accumulated electricity of each micro-collective metering switch; ε j Represents the relative error of each micro-collective metering switch at a certain fixed current load point; ε y Represents the line loss rate of the electric energy meter verification device; ε0 represents the fixed loss of the electric energy meter verification device itself; Step 5: By changing T i The accumulated electricity value of the standard electric energy meter and the micro-collective metering switch can be continuously obtained over time, and the obtained data is substituted into formula (3) for calculation and solution, so as to calculate the error value of each micro-collective metering switch under the current load current.

3. The error testing method of a micro-collective metering switch according to claim 2, characterized in that: it also includes: Step 6: To obtain the error value of the micro-collective metering switch at other load current points, just let the electric energy meter calibration device output the output according to the required load current point, and then repeat steps 1 and 5 to achieve the error test of the micro-collective metering switch at different load current points.

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