KR20200002226A - Apparatus for detecting phase error of watt hour meter and method thereof - Google Patents

Abstract

The present invention provides an apparatus for detecting a phase error of a watt-hour meter and a method thereof which sense and output a phase error in real time. The apparatus for detecting a phase error of a watt-hour meter comprises: a phase voltage measurement unit to measure a phase voltage of each phase in a watt-hour meter which measures wattage on a secondary side of an MOF connected to a primary side of a transformer of a power-receiving facility; a phase current measurement unit to measure a phase current of each phase in the watt-hour meter; a metering control unit to meter three-phase four-line wattage on each phase based on the phase voltage of each phase inputted from the phase voltage measurement unit and the phase current of each phase inputted from the phase current measurement unit, meter three-phase three-line wattage on each phase based on the phase current and a line-to-line voltage calculated from the phase voltage of each phase, compare the three-phase four-line wattage and the three-phase three-line wattage on each phase with each other to detect a phase error, and output a detection result; and an output unit to output the detection result of the phase error detected from the metering control unit.

Description

Phase error detection device of electricity meter and its method {APPARATUS FOR DETECTING PHASE ERROR OF WATT HOUR METER AND METHOD THEREOF}

The present invention relates to an apparatus and a method for detecting a phase error of a wattmeter, and more particularly, in a case where a wattmeter is installed on the primary side in an environment in which a connection of a power receiving facility transformer is delta-wire connection, The present invention relates to a device and a method for detecting a phase error of a watt-hour meter which detects and outputs in real time.

In general, as a method of metering power consumption in a home or a factory, a meter reader visits a customer directly to check meter reading result data of a electricity meter, records the meter reading on a meter sheet, etc., and returns to the company to store data such as a computer. The method of inputting the data recorded in the is used.

However, the method of meter reading by the meter reader is likely to cause an error, and thus often, accurate metering data collection and charging are not performed. In addition, the electricity meter needs to be regularly inspected and immediately repaired in order to perform accurate meter reading, but it causes an inaccurate meter reading because the failure report is not made immediately.

As a result, complaints are frequently issued due to incorrect billing notices, and various problems occur such as crimes that pretend to be meter readers and national losses due to rising labor costs due to employment of meter readers. In order to achieve this, various types of remote meter reading systems have been developed and used.

However, even in the operation of the remote meter reading system, if there is no way to remotely check the abnormal state associated with the electricity meter, it is necessary to visit the site where the electricity meter is installed at a predetermined predetermined cycle to check whether the abnormal condition occurs.

To this end, a manpower is required to visit and check the installation site of the electricity meter on a regular basis, and the labor cost reduction effect due to the remote meter reading is canceled according to the employment of such manpower.

The electricity meter to measure the power used must be fairly charged by metering the power used by the customer. However, the electricity meter may malfunction or break down during use.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 1175868 (August 14, 2012. Anomaly detection method and abnormality detection device in power metering).

As such, if an error or failure occurs in the electricity meter, an immediate failure recovery should be made. However, since there is no immediate failure action due to the fact that the failure does not occur, there is a problem in that a lot of losses occur because accurate power transactions are not made.

The present invention has been made to solve the above problems, an object of the present invention according to one aspect is to provide its own metering information when the meter is installed on the primary side in an environment where the connection of the power receiving facility transformer is delta-wire connection The present invention provides a phase error detection device and a method of a watt-hour meter that detects and outputs phase error in real time.

Phase error detection device of the wattmeter according to an aspect of the present invention, the phase voltage measuring unit for measuring the phase voltage of each phase in the wattmeter for measuring the amount of power on the secondary side of the MOF connected to the primary side of the transformer facility transformer; Phase current measuring unit for measuring the phase current of each phase in the electricity meter; Based on the phase voltage of each phase input from the phase voltage measuring unit and the phase current of each phase input from the phase current measuring unit, the amount of 3-phase 4-wire power of each phase is measured, and based on the line voltage and the phase current calculated from the phase voltage of each phase. A metering control unit for measuring the amount of three-phase three-wire electric power in each phase, comparing the three-phase four-wire electric power amount and three-phase three-wire electric power amount in each phase to detect a phase error and outputting a detection result; And an output unit for outputting a detection result of the phase error detected from the weighing control unit.

In the present invention, the transformer is characterized in that the connection in the delta-wire manner.

In the present invention, the electricity meter is a three-phase four-wire electricity meter.

The metering control unit in the present invention, the three-phase four-wire metering unit for measuring the amount of power of each phase by multiplying the phase voltage and the phase current of each phase based on the phase voltage of each phase and the phase current of each phase; A three-phase three-wire meter for calculating a line voltage between adjacent phases for each phase based on the phase voltages of each phase, and multiplying the calculated line voltage with each phase current; And a phase error detection unit for detecting a phase error of each phase by comparing the sum of the amounts of power of the three phases measured in the three-phase four-wire metering unit with the sum of the amounts of power of the other two phases measured in the three-phase three-wire metering unit for each phase. It is characterized by.

According to another aspect of the present invention, there is provided a method of detecting a phase error of a wattmeter, comprising: receiving, by a metering control unit, a phase voltage and a phase current of each phase measured by a wattmeter; Measuring, by the metering control unit, the amount of power of each phase in a three-phase four-wire system based on the phase voltage and phase current of each phase; Measuring, by the metering control unit, the amount of power of each phase in a three-phase three-wire system based on the line voltage and the phase current of each phase calculated from the phase voltages of each phase; Detecting, by the metering control unit, a phase error by comparing the three-phase four-wire power amount and the three-phase three-wire power amount for each phase; And outputting, by the weighing control unit, a detection result of the phase error.

In the present invention, the watt-hour meter is characterized by measuring the amount of power on the secondary side of the MOF connected to the primary side of the power receiving equipment transformer.

In the present invention, the transformer is characterized in that the connection in the delta-wire manner.

In the present invention, the electricity meter is a three-phase four-wire electricity meter.

In the detecting of the phase error in the present invention, the weighing control unit detects the phase error of each phase by comparing the sum of the amounts of power of the three phases of the three-phase four-wire and the sum of the amounts of power of the three phases of the three-phase three-wire for each phase. It is done.

Phase error detection device and method of the wattmeter according to an aspect of the present invention, when the wattmeter is installed on the primary side in an environment where the connection of the power transformer is delta-wire connection, three phases for each phase based on its own metering information By comparing the three-wire power and three-phase four-wire power and detecting the phase error in real time, it is possible to immediately identify the abnormality or failure status of the electricity meter so that accurate power transactions can be made through immediate failover.

1 is a block diagram illustrating an apparatus for detecting a phase error of a power meter according to an embodiment of the present invention.
2 is a block diagram illustrating in more detail the metering control unit of the phase error detection device of the electricity meter according to the embodiment of the present invention.
3 is a schematic diagram of a power receiving facility for explaining an installation position of a power meter according to an embodiment of the present invention.
4 is a flowchart illustrating a phase error detection method of a power meter according to an embodiment of the present invention.

Hereinafter, an apparatus and a method for detecting a phase error of a wattmeter according to the present invention will be described with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram illustrating a phase error detection device of a watt-hour meter according to an embodiment of the present invention, and FIG. 2 is a block illustrating the weighing control unit of the phase error detection device of a watt-hour meter in accordance with an embodiment of the present invention. 3 is a schematic diagram of a power receiving facility for explaining an installation position of a wattmeter according to an embodiment of the present invention.

As shown in FIG. 1, a phase error detection device of a wattmeter according to an embodiment of the present invention includes a phase voltage measuring unit 10, a phase current measuring unit 20, a metering control unit 30, and an output unit 40. Include.

As shown in FIG. 3, the phase voltage measuring unit 10 measures an amount of power at a secondary side of a metering out fit (MOF) 60 connected to the primary side of the power receiving facility transformer 80. The phase voltage of the phase may be measured and provided to the weighing controller 30.

The phase current measuring unit 20 may measure the phase current of each phase in the watt-hour meter 70 and provide it to the metering control unit 30.

Here, the transformer 80 is connected in a delta (primary side) -wire (secondary side) manner for load balancing, and the electricity meter 70 may be a three-phase four-wire electricity meter.

Therefore, the electricity meter 70 measures the amount of power by measuring the phase voltage and the phase current of each phase stepped down for measurement on the secondary side of the MOF 60 connected via the breaker 50 in the high voltage line. The metered power is transferred to a server (not shown) through a remote metering system and charged to the customer according to the amount of power.

In addition, the high voltage is passed through the MOF (60), the voltage is adjusted through the transformer 80 is supplied to the load 90 of each customer.

The metering control unit 30 measures the amount of three-phase four-wire power of each phase based on the phase voltage of each phase input from the phase voltage measuring unit 10 and the phase current of each phase input from the phase current measuring unit 20, respectively. The three-phase three-wire power amount of each phase is measured based on the line voltage and the phase current calculated from the phase voltage, and the phase error is detected by comparing the three-phase four-wire power amount and the three-phase three-wire power amount of each phase, and the detection result. You can output

Here, the metering control unit 30 may include a three-phase four-wire metering unit 32, a three-phase three-wire metering unit 34, and an phase error detector 36 as shown in FIG. 2.

The three-phase four-wire metering unit 32 measures the phase voltage (V _a , V _b , V _c ) of each phase and the phase currents I _a , I _{b in} a manner that the three-phase four-wire electricity meter 70 measures for charging. , I _c ) may be multiplied by the phase voltage of each phase and the phase current of each phase to measure the amount of power P _a , P _b and P _c of each phase.

In this case, when the amount of power P _a , P _b , P _c measured by the three-phase four-wire metering unit 32 is represented by a formula, it may be expressed as Equation 1.

Here, it is a phase voltage phase of each phase of (theta) _va , (theta) _vb , and (theta) _vc , and it is a phase current phase of each of (theta) _ia , (theta) _ib , and (theta) _ic phases.

The three-phase three-wire meter 34 calculates a line voltage between adjacent phases of each phase based on the phase voltages of each phase, and calculates the calculated line voltages (V _ab , V _bc , V _ca ) and the phase current of each phase. Multiply (I _a , I _b , I _c ) to measure the amount of power P _A , P _B , P _{C in} each phase.

In this case, when the power amount P _A , P _B , P _C measured by the three-phase three-wire metering unit 34 is represented by a formula, it may be expressed as Equation 2.

Here, it is the line voltage phase of each phase of θ _vab , θ _vbc , and θ _vca , and the phase current phase of each of θ _ia , θ _ib , and θ _ic .

The phase error detection unit 36 measures each phase in the three-phase three-wire metering unit 34 to detect a state in which a phase error occurs due to an electrical or mechanical abnormality or failure of the three-phase four-wire wattmeter 32. The phase error of each phase is detected by comparing the sum of the amounts of power of the other two phases and the sum of the amounts of power of the three phases measured by the three-phase four-wire metering section 32.

This is because the three-phase four-wire wattmeter 70 is connected to the three-phase four-wire wattmeter 70 because the watt-hour meter 70 is connected to the delta connection, which is the primary side of the transformer 80, by the MOF 60. When comparing the amount of power measured by the phase error of the three-phase four-wire electricity meter 70 can be detected.

For example, as shown in Equation 3, when comparing the sum of power amounts (P _TA ) of the three-phase three-wire system and the phase power of all three phases of the three-phase four-wire system (P _t ), It will be the same within the range.

Therefore, the phase error detection unit 36 compares the sum of the amounts of power of two phases of the three-phase three-wire (P _TA ) and the sum of the amounts of three phases of the three-phase four-wire (P _t ) of each phase, as shown in Equation 4, and the reference value ( If it is out of the criteria, it can be detected that an error has occurred in the phase.

The output unit 40 may output the detection result of the phase error detected by the weighing control unit 30.

As such, when transmitting to the server of the remote metering system through the output unit 40, it is possible to immediately determine the failure state can be made to immediately fail over.

As described above, according to the phase error detection device of the electricity meter according to the embodiment of the present invention, when the electricity meter is installed on the primary side in an environment in which the connection of the power receiving facility transformer is delta-wire connection, By comparing the three-phase three-wire power and three-phase four-wire power for each phase and detecting and outputting phase errors in real time, it is possible to immediately identify an abnormality or failure state of the electricity meter so that accurate power transactions can be made with immediate failover.

4 is a flowchart illustrating a phase error detection method of a power meter according to an embodiment of the present invention.

As shown in FIG. 4, in the phase error detection method of the electricity meter according to the embodiment of the present invention, the metering control unit 30 receives the phase voltage and the phase current of each phase measured by the electricity meter 70, respectively (S10). .

Here, the electricity meter 70 is a phase of each phase stepped down for metering on the secondary side of the MOF 60 connected to the primary side of the breaker 50 and the power receiving equipment transformer 80 in the high-voltage line as shown in FIG. The amount of power can be measured by measuring phase voltage and phase current for the set time.

In this case, the transformer 80 is connected in a delta (primary side) -wire (secondary side) manner to balance the load, and the electricity meter 70 may be a three-phase four-wire electricity meter.

Therefore, the metering control unit 30 may receive the phase voltage and the phase current of each phase measured from the phase voltage measuring unit 10 and the phase current measuring unit 20 of the watt-hour meter 70, respectively.

After receiving the phase voltage and the phase current of each phase in step S10, the weighing control unit 30 is based on the phase voltage (V _a , V _b , V _c ) and phase current (I _a , I _b , I _c ) of each phase. The amount of power P _a , P _b , P _c in each phase can be measured (S20).

At this time, the power amount (P _a , P _b , P _c ) of each phase in the three-phase four-wire equation can be expressed as Equation 5.

Here, it is a phase voltage phase of each phase of (theta) _va , (theta) _vb , and (theta) _vc , and it is a phase current phase of each of (theta) _ia , (theta) _ib , and (theta) _ic phases.

In addition, the metering control unit 30 is based on the line voltage (V _ab , V _bc , V _ca ) and the phase currents I _a , I _b , I _c calculated from the phase voltages of the respective phases. The amount of power P _A , P _B , P _C may be measured (S30).

At this time, the power amount P _A , P _B , P _C in each of the three-phase three-wire equations may be represented by Equation 6.

Here, it is the line pressure phase of each phase of (theta) _vab , (theta) _vbc , and (theta) _vca , and is a phase current phase of each of (theta) _ia , (theta) _ib , and (theta) _ic phases.

In step S20 and step S30, after measuring the three-phase four-wire power amount and three-phase three-wire power amount of each phase, the power control unit 30 compares the three-phase four-wire power amount and three-phase three-wire power amount measured for each phase, An image error in an image may be detected (S40).

In the present embodiment, since the electricity meter 70 is connected in three-phase four-wire form by the MOF 60 at the delta connection side, which is the primary side of the transformer 80, the three-phase four-wire electricity meter 70 has a value of three. When comparing the amount of power measured by the phase three-wire type, it is possible to detect a phase error of the three-phase four-wire watt hour meter 70.

Therefore, the power meter 30 may detect the phase error of each phase by comparing the sum of the amounts of power of the three phases measured by the three-phase four-wire type with the sum of the amounts of power of the two phases measured by the three-phase three-wire type for each phase.

For example, when compared to the (P _t) the three-phase three-wire b phase and the amount of power sum over c (P _TA) and the three-phase four-wire three-phase all of the sum of the amount of power relative to the phase a, as equation (7) the reference value range Will be the same within.

Therefore, the weighing control unit 30 compares the sum of the amounts of power of the two phases of the three-phase three-wire (P _TA ) and the sum of the amounts of three phases of the three-phase four-wire (P _t ) of each phase, as shown in Equation 8, and the reference value (criteria). If it is out of), it can be detected that an error has occurred in the phase.

In operation S40, the weighing control unit 30 may compare the amount of power measured for each phase, detect a phase error of each phase, and output the detection result through the output unit 40 (S50).

At this time, when the metering control unit 30 transmits to the server (not shown) of the remote meter reading system through the output unit 40, the failure state can be immediately recognized, so that an immediate failover can be made.

As described above, according to the phase error detection method of the wattmeter according to the embodiment of the present invention, when the wattmeter is installed on the primary side in an environment in which the connection of the power receiving facility transformer is delta-wire connection, By comparing the three-phase three-wire power and three-phase four-wire power for each phase and detecting and outputting phase errors in real time, it is possible to immediately identify an abnormality or failure state of the electricity meter so that accurate power transactions can be made with immediate failover.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: phase voltage measuring unit 20: phase current measuring unit
30: Weighing control unit 32: 3-phase 4-wire metering unit
34: 3-phase 3-wire meter 36: Phase error detector
40: output unit 50: breaker
60: MOF 70: power meter
80: transformer 90: load

Claims (9)

Phase voltage measuring unit for measuring the phase voltage of each phase in the electricity meter for measuring the amount of power on the secondary side of the MOF connected to the primary side of the transformer facility transformer;
Phase current measuring unit for measuring the phase current of each phase in the power meter;
The three-phase 4-wire power amount of each phase is measured based on the phase voltage of each phase input from the phase voltage measuring unit and the phase current of each phase input from the phase current measuring unit, and the line voltage calculated from the phase voltage of each phase. And measuring the amount of three-phase three-wire power in each phase based on the phase current, comparing the three-phase four-wire power amount and the three-phase three-wire power amount in each phase to detect a phase error, and outputting the detection result. Weighing control unit; And
And an output unit for outputting a detection result of the phase error detected by the weighing control unit.
The apparatus of claim 1, wherein the transformer is connected in a delta-wise manner.
The phase error detection device according to claim 1, wherein the electricity meter is a three-phase four-wire electricity meter.
The apparatus of claim 1, wherein the metering control unit comprises: a three-phase four-wire metering unit that multiplies the phase voltage of each phase by the phase current of each phase based on the phase voltage of the phase and the phase current of each phase to measure the amount of power in each phase;
A three-phase three-wire meter that calculates the line voltage between adjacent phases for each phase based on the phase voltages of each phase, and multiplies the calculated line voltage with each phase current of each phase to measure the amount of power in each phase; And
A phase error detection unit for detecting a phase error of each phase by comparing the sum of power amounts of the other two phases measured by the three-phase three-wire metering unit with each phase and the sum of the power amounts of the three phases measured by the three-phase four-wire metering unit; Phase error detection device of a watt-hour meter, characterized in that.
Receiving, by the metering control unit, phase voltage and phase current of each phase measured by the wattmeter;
Metering the amount of power of each phase by a three-phase four-wire system based on the phase voltage and the phase current of each phase;
Measuring, by the metering control unit, the amount of power of each phase in a three-phase three-wire system based on the line voltage and the phase current calculated from the phase voltage of each phase;
Detecting, by the metering control unit, a phase error by comparing the amount of three-phase four-wire power and the amount of three-phase three-wire power for each phase; And
And the step of outputting the detection result of the phase error by the weighing control unit.
The method of claim 5, wherein the electricity meter measures the amount of power at the secondary side of the MOF connected to the primary side of the power receiving facility transformer.
7. The method of claim 6, wherein the transformer is connected in a delta-wise manner.
The method of claim 5, wherein the electricity meter is a three-phase four-wire electricity meter.
6. The method of claim 5, wherein the detecting of the phase error comprises: the weighing control unit comparing the sum of the amounts of power of the three phases of the three phase and the four phases with the sum of the amounts of power of the three phases of the three phases and four wires for each phase. Phase error detection method of the electricity meter, characterized in that for detecting the error.

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