A HPLC module with voltage measurement and a method for judging voltage error of a meter

Abstract

The present invention discloses an HPLC module with voltage measurement, including an HPLC module and a voltage measuring device, wherein the voltage measuring device includes a connected voltage transformer and a metering chip, and the present invention also discloses a meter voltage error judgment method of an HPLC module with voltage measurement, including: if the carrier module voltage is greater than the meter voltage, a negative error out of tolerance occurs in the meter voltage measurement; if the carrier module voltage is less than the meter voltage, a positive error out of tolerance occurs in the meter voltage measurement; if the carrier module voltage is equal to the meter voltage, the meter voltage measurement does not out of tolerance. The present invention transforms the existing HPLC module to measure the carrier module voltage, and compares it with the meter voltage, so that the judgment of whether the meter voltage measurement is out of tolerance is more accurate and effective.

Description

Technical Field

[0001] The present invention relates to the technical field of electricity collection, and in particular to a HPLC module with voltage measurement and a method for judging a meter voltage error, wherein the HPLC is a broadband high-speed power line carrier. Background Art

[0002] There are a large number of household meters. During the long-term operation, the performance of some meter components has declined or been damaged, resulting in inaccurate measurement, which is mainly manifested in voltage or current deviation, under- or over-metering of electricity. However, household meters are not regularly calibrated, and potential faults exist for a long time. If the electricity is under-metered, it will cause losses to the power supply department. If the electricity is over-metered, it may cause service complaints and even cause great social public opinion.

[0003] Substation line loss analysis is one of the means to monitor metering failures. However, due to the large number of households and small power consumption, it is difficult to troubleshoot. Some metering failures are difficult to reflect in the substation line loss, making it difficult to make accurate judgments. For single-phase residential meters, the structure of a single-phase meter is as follows: Figure 1 As shown in the figure, the meter measures the voltage, live wire and neutral wire current. In the normal electricity use process of residents, the live wire and neutral wire current form a series circuit and have the same value at the same time, such as Figure 2 As shown in the figure, the electricity consumption information collection system has realized the daily collection of voltage, live line current, and neutral line current of residential users at four time points. By comparing the difference between the neutral and live line currents, it can be judged whether the current measurement is out of tolerance, but the meter only samples one voltage (three-phase meter is three-phase phase voltage), and there is no reference comparison, so it is impossible to judge whether the meter voltage measurement is out of tolerance. Therefore, another set of independent voltage measurements is required to constitute a reference comparison to judge whether the meter voltage measurement is out of tolerance. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] Based on the above problems, the present invention provides an HPLC module with voltage measurement and a method for judging the voltage error of a meter. By modifying the existing HPLC module and adding a voltage measuring device, the measured carrier module voltage is used for comparison with the meter voltage, making the judgment of whether the meter voltage measurement is out of tolerance more accurate and effective.

[0006] (II) Technical solution

[0007] Based on the above technical problems, the present invention provides an HPLC module with voltage measurement, including an HPLC module and a voltage measuring device, including an HPLC module and a voltage measuring device, the voltage measuring device includes a connected voltage transformer and a metering chip, the HPLC module includes a module power supply, a voltage detection module, a carrier chip, an AC interface, and a zero-crossing circuit, the module power supply is externally connected to an electric energy meter, the AC interface is externally connected to a power line, the carrier chip is respectively connected to the voltage detection module, the zero-crossing circuit, and the metering chip, the AC interface is respectively connected to the zero-crossing circuit and the voltage transformer, and the voltage detection module is also connected to the module power supply; the voltage transformer is used to sample the line voltage and convert it into a low voltage; the metering chip is used to measure the effective value of the line voltage and transmit it to the carrier chip for storage; the zero-crossing circuit is used to determine whether the power line is powered off and identify the phase; the voltage detection module is used to determine whether the meter is powered off.

[0008] Furthermore, the HPLC module also includes a weak-current communication interface, a carrier transceiver circuit, an indicator light and a Flash memory respectively connected to the carrier chip, the weak-current communication interface is externally connected to an electric energy meter, and the carrier transceiver circuit is connected to the AC interface.

[0009] Furthermore, for a single-phase electric energy meter, the voltage measuring device is a set of voltage transformers and a single-phase metering chip; for a three-phase electric energy meter, the voltage measuring device is three voltage transformers and a three-phase metering chip.

[0010] Preferably, the voltage transformer is ZHTPT107W.

[0011] Preferably, the single-phase metering chip is HT7017, and the three-phase metering chip is HT7038.

[0012] Preferably, the carrier chip is SC3015H.

[0013] The present invention also discloses a method for determining a voltage error of a meter of an HPLC module with voltage measurement, the method comprising the following steps:

[0014] S1. Install the HPLC module with voltage measurement at the electric energy meter and connect it to the electric energy meter;

[0015] S2. The communication protocols DL / T645-2007 and DL / T698.45 of the meter are expanded. The communication protocol DL / T645-2007 adds data identifiers 02800100, 02800200, 02800300, and 0280FF00, which correspond to the carrier module A phase voltage, carrier module B phase voltage, carrier module C phase voltage, and carrier module voltage data block respectively; the object-oriented protocol DL / T698.45 adds an object identifier OI of 2000, and the extended attribute 4 is the carrier module voltage, that is, OAD20000400;

[0016] S3. If the concentrator reads the meter voltage, the meter returns the voltage value through the HPLC module with voltage measurement; if the concentrator reads the carrier module voltage, the HPLC module with voltage measurement directly returns the voltage value measured by itself; the two sets of voltages are uploaded to the acquisition master station for comparison;

[0017] S4. If the carrier module voltage is greater than the meter voltage, a negative error occurs in the meter voltage measurement; if the carrier module voltage is less than the meter voltage, a positive error occurs in the meter voltage measurement; if the carrier module voltage is equal to the meter voltage, no error occurs in the meter voltage measurement.

[0018] (III) Beneficial effects

[0019] The above technical solution of the present invention has the following advantages:

[0020] (1) The present invention is based on conventional means of power line carrier communication method, adds a voltage transformer and a metering chip to the original HPLC module, so as to add a voltage measurement function, avoids the modification of the meter structure, makes the module compatible with the original HPLC module in form and structure, and has low hardware cost, easy promotion and strong practicality;

[0021] (2) The present invention transforms the HPLC module, and the HPLC module with voltage measurement is together with the electric energy meter. The measured carrier module voltage and the meter voltage come from the same metering point, making the method for determining whether the meter voltage measurement is out of tolerance simpler, but more accurate and effective, that is, there will be no voltage range that cannot be determined, and the existing voltage tolerance will not be ignored due to line voltage drop, and whether there is a metering fault can be determined by comparison;

[0022] (3) Compared with the voltage comparison between the meter in the same meter box and the voltage of the monitoring device, the present invention does not require the correspondence between the meter and the meter box, thus avoiding misjudgment caused by correspondence errors, and is simpler and less costly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the structure of a single-phase meter;

[0025] Figure 2 This is the zero-live current loop diagram;

[0026] Figure 3 The figure is a schematic diagram of the principle of an HPLC module with voltage measurement according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] like Figure 3 As shown, an HPLC module with voltage measurement includes an HPLC module and a voltage measuring device, the voltage measuring device includes a connected voltage transformer and a metering chip, the HPLC module is a broadband high-speed power line carrier module, and is a data transmission device for reading an electric energy meter based on a low-voltage power line HPLC communication technology in an electricity collection system, including a module power supply, a voltage detection module, a carrier chip, a weak current communication interface, an AC interface, a carrier transceiver circuit, a zero-crossing circuit, an indicator light and a Flash memory, the module power supply and the weak current communication interface are externally connected to the electric energy meter, the AC interface is externally connected to a 220V power line, the carrier chip is respectively connected to the voltage detection module, the weak current communication interface, the indicator light, the Flash memory, the zero-crossing circuit, the carrier transceiver circuit, and the metering chip, the AC interface is respectively connected to the zero-crossing circuit, the carrier transceiver circuit, and the voltage transformer, and the voltage detection module is also connected to the module power supply.

[0029] The electric energy meter realizes data transmission between the electric energy meter and the concentrator by sequentially connecting the weak current communication interface, carrier chip, carrier transceiver circuit, AC interface, and 220V power line inside the HPLC module to the concentrator; the module power supply is used to convert the power provided by the electric energy meter into the working power supply of the HPLC module; the voltage detection module is used to determine whether the meter is powered off; the voltage transformer is used to sample the line voltage and convert it into a low voltage; the metering chip is used to measure the effective value of the line voltage and transmit it to the carrier chip for storage; the zero-crossing circuit is used to determine power outages and phase identification of the power line.

[0030] For a single-phase energy meter, the voltage measurement device is a set of voltage transformers and a single-phase metering chip; for a three-phase energy meter, the voltage measurement device is three voltage transformers and a three-phase metering chip. The voltage transformer is ZHTPT107W, the single-phase metering chip is HT7017, the three-phase metering chip is HT7038, and the carrier chip is SC3015H.

[0031] The present invention also discloses a method for judging the voltage error of a meter of an HPLC module with voltage measurement:

[0032] S1. Install the HPLC module with voltage measurement at the electric energy meter and connect it to the electric energy meter;

[0033] S2. The communication protocols DL / T645-2007 and DL / T698.45 of the meter are expanded. The communication protocol DL / T645-2007 adds data identifiers 02800100, 02800200, 02800300, and 0280FF00, which correspond to the carrier module A phase voltage, carrier module B phase voltage, carrier module C phase voltage, and carrier module voltage data block respectively; the object-oriented protocol DL / T698.45 adds an object identifier OI of 2000, and the extended attribute 4 is the carrier module voltage. According to OAD20000400, the carrier module voltage data of the object-oriented electric energy meter can be accessed;

[0034] The expansion of DL / T645-2007 is shown in the following table:

[0035]

[0036] The expansion of DL / T698.4 is shown in the following table:

[0037]

[0038] S3. If the concentrator reads the meter voltage, the meter returns the voltage value through the HPLC module with voltage measurement; if the concentrator reads the carrier module voltage, the HPLC module with voltage measurement directly returns the voltage value measured by itself; the two sets of voltages are uploaded to the acquisition master station for comparison;

[0039] That is, in the electricity consumption collection system, the HPLC module with voltage measurement parses the data request frame received from the power line carrier. For example, if it is to read the carrier module voltage data frame, the carrier module voltage data saved by the HPLC module with voltage measurement is sent to the power line, and fed back to the concentrator through the power line; if it is to read the meter voltage data frame, it is forwarded to the electric energy meter through the weak current communication interface, and then the meter voltage data is sent to the power line through the HPLC module with voltage measurement, fed back to the concentrator through the power line, and then uploaded to the collection main station for comparison.

[0040] S4. If the carrier module voltage is greater than the meter voltage, a negative error occurs in the meter voltage measurement; if the carrier module voltage is less than the meter voltage, a positive error occurs in the meter voltage measurement; if the carrier module voltage is equal to the meter voltage, no error occurs in the meter voltage measurement.

[0041] Although the method of the present invention is simple, it has significant effects. To highlight the technical effects of the present invention, three common judgment methods in the existing meter voltage error judgment methods are compared and explained one by one:

[0042] Comparison 1: Taking a single-phase household meter as an example, the voltage value of the single-phase household meter is analyzed. If the voltage value of the household meter is particularly low, that is, lower than 140V, it is generally a metering fault. However, if the voltage value of the household meter is not particularly low, and is between 140V-220V, it is impossible to determine whether there is a metering fault. The present invention can eliminate metering faults through voltage comparison, and the measured carrier module voltage and meter voltage can be regarded as measured by one metering point. Whether the meter voltage value is lower than 140V, between 140V-220V, or higher than 220V, comparison and judgment can be performed, and there will be no voltage interval that cannot be judged.

[0043] Comparison 2: By comparing the household meter voltage with the total meter in the substation, if the household meter voltage is higher than the total meter voltage, it means that the meter voltage measurement has an out-of-tolerance. However, this method can only roughly analyze the meter whose household meter voltage is obviously higher than the total meter voltage. Due to the line voltage drop, if the input value of the household meter voltage is already much lower than the total meter voltage, even if the measured value is larger than the input value and exceeds the positive error range, the measured value seen by the power consumption information collection main station will still be lower than the total meter voltage, and the voltage out-of-tolerance cannot be monitored. The HPLC module with voltage measurement described in the present invention is together with the electric energy meter, and the measured carrier module voltage and the meter voltage can be regarded as measured by one metering point, so the existing voltage out-of-tolerance cannot be detected due to the line voltage drop.

[0044] Comparison three: by installing a three-phase voltage monitoring device in the centralized meter box, the voltage of the meter in the same meter box is compared with the voltage of the monitoring device to determine whether it is out of tolerance. The line voltage drop of this method can also be ignored, and it is regarded as two sets of voltages at the same metering point. However, this method requires that the correspondence and phase relationship between the meter and the meter box are very accurate. At the same time, the cost of using this method for most single-household meters in rural areas is very high. The present invention does not require a correspondence between the meter and the meter box, avoids misjudgment due to correspondence errors, is simpler and has lower costs.

[0045] Installing the HPLC module together with the electric energy meter is a common method of power line carrier communication. The carrier module voltage and the meter voltage obtained by the HPLC module with a voltage measurement device can be regarded as two sets of voltages measured by the same metering point. Therefore, comparing the two sets of voltages with each other to determine whether a voltage deviation occurs is more effective and accurate than other methods.

[0046] In summary, the above-mentioned HPLC module with voltage measurement and the meter voltage error judgment method have the following advantages:

[0047] (1) The present invention is based on conventional means of power line carrier communication method, adds a voltage transformer and a metering chip to the original HPLC module, so as to add a voltage measurement function, avoids the modification of the meter structure, makes the module compatible with the original HPLC module in form and structure, and has low hardware cost, easy promotion and strong practicality;

[0048] (2) The present invention transforms the HPLC module, and the HPLC module with voltage measurement is together with the electric energy meter. The measured carrier module voltage and the meter voltage come from the same metering point, making the method for determining whether the meter voltage measurement is out of tolerance simpler, but more accurate and effective, that is, there will be no voltage range that cannot be determined, and the existing voltage tolerance will not be ignored due to line voltage drop, and whether there is a metering fault can be determined by comparison;

[0049] (3) Compared with the voltage comparison between the meter in the same meter box and the voltage of the monitoring device, the present invention does not require the correspondence between the meter and the meter box, thus avoiding misjudgment caused by correspondence errors, and is simpler and less costly.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. An HPLC module with voltage measurement, characterized in that: It comprises an HPLC module and a voltage measuring device, wherein the voltage measuring device comprises a connected voltage transformer and a metering chip, the HPLC module comprises a module power supply, a voltage detection module, a carrier chip, an AC interface, and a zero-crossing circuit, the module power supply is externally connected to an electric energy meter, the AC interface is externally connected to a power line, the carrier chip is respectively connected to the voltage detection module, the zero-crossing circuit, and the metering chip, the AC interface is respectively connected to the zero-crossing circuit and the voltage transformer, and the voltage detection module is also connected to the module power supply; the voltage transformer is used to sample the line voltage and convert it into a low voltage; the metering chip is used to measure the effective value of the line voltage and transmit it to the carrier chip for storage; the zero-crossing circuit is used to determine whether the power line is powered off and identify the phase; the voltage detection module is used to determine whether the meter is powered off; The HPLC module with voltage measurement is installed at the electric energy meter and connected to the electric energy meter; If the concentrator reads the meter voltage, the meter returns the voltage value through the HPLC module with voltage measurement; If the concentrator reads the voltage of the carrier module, the HPLC module with voltage measurement directly returns the voltage value measured by itself; the two sets of voltages are uploaded to the acquisition master station for comparison; If the carrier module voltage is greater than the meter voltage, it is determined that a negative error exceeds the tolerance in the meter voltage measurement; If the carrier module voltage is less than the meter voltage, a positive error occurs in the meter voltage measurement; If the carrier module voltage is equal to the meter voltage, it is determined that the meter voltage measurement is within tolerance.

2. A HPLC module with voltage measurement according to claim 1, characterized in that: The HPLC module also includes a weak current communication interface, a carrier transceiver circuit, an indicator light and a Flash memory which are respectively connected to the carrier chip; the weak current communication interface is externally connected to an electric energy meter, and the carrier transceiver circuit is connected to the AC interface.

3. A HPLC module with voltage measurement according to claim 1, characterized in that: For a single-phase electric energy meter, the voltage measuring device is a set of voltage transformers and a single-phase metering chip; for a three-phase electric energy meter, the voltage measuring device is three voltage transformers and a three-phase metering chip.

4. The HPLC module with voltage measurement according to claim 1, characterized in that: The voltage transformer is ZHTPT107W.

5. The HPLC module with voltage measurement according to claim 3, characterized in that: The single-phase metering chip is HT7017, and the three-phase metering chip is HT7038.

6. The HPLC module with voltage measurement according to claim 1, characterized in that: The carrier chip is SC3015H.

7. A method for determining a meter voltage error of an HPLC module with voltage measurement according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Install the HPLC module with voltage measurement at the electric energy meter and connect it to the electric energy meter; S2. The communication protocols DL / T645-2007 and DL / T698.45 of the meter are expanded. The communication protocol DL / T645-2007 adds data identifiers 02800100, 02800200, 02800300, and 0280FF00, which correspond to the carrier module A phase voltage, carrier module B phase voltage, carrier module C phase voltage, and carrier module voltage data block respectively; the object-oriented protocol DL / T698.45 adds an object identifier OI of 2000, and the extended attribute 4 is the carrier module voltage, that is, OAD20000400; S3. If the concentrator reads the meter voltage, the meter returns the voltage value through the HPLC module with voltage measurement; if the concentrator reads the carrier module voltage, the HPLC module with voltage measurement directly returns the voltage value measured by itself; the two sets of voltages are uploaded to the acquisition master station for comparison, that is, the HPLC module with voltage measurement parses the data request frame received from the power line carrier, and if it is to read the carrier module voltage data frame, the carrier module voltage data saved by the HPLC module with voltage measurement is fed back to the concentrator; if it is to read the meter voltage data frame, it is forwarded to the electric energy meter through the weak current communication interface, and then the meter voltage data is fed back to the concentrator through the HPLC module with voltage measurement; S4. If the carrier module voltage is greater than the meter voltage, a negative error occurs in the meter voltage measurement; if the carrier module voltage is less than the meter voltage, a positive error occurs in the meter voltage measurement; if the carrier module voltage is equal to the meter voltage, no error occurs in the meter voltage measurement.

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