KR200260977Y1 - Electronic electric power system - Google Patents

Abstract

The present invention relates to an electronic power meter, comprising: a power supply circuit unit connected between a power supply side and a general load to supply operating power to each circuit unit so as to identify a faulty connection, an unconnected connection, and a natural and artificial open phase; Connected between the power supply side and the general load, converts the supplied general-purpose power into voltage and current of several volts, multiplies it, and modulates the pulse width, and also converts the frequency into a frequency proportional to the amount of power by the pulse width modulated signal. An output power / frequency converter; Calculates and measures the amount of power used by the output signal from the power / frequency converter, and reads the phase angle and sensing values of voltage and current to determine incorrect and unconnected status. A digital circuit unit for recording and outputting a time point at which this occurs; And a data display unit for displaying the amount of power to be displayed to the user by the output signal from the digital circuit unit, a miswired and unconnected state, and an imaging point.

Description

Electronic electric power system

The present invention relates to an electronic electricity meter, and in more detail, when connecting a combination of CT, PT, and electricity meters required to measure the amount of power used in a large-scale accommodation facility such as a factory and a shopping mall, it prevents error metering due to incorrect or incomplete wiring. And to solve the other problems accordingly, the miswired and unconnected status is displayed on the data display part of the electricity meter, and when the natural and artificial phases are lost, the electronic electricity meter can store the time of the missing phase and display the data value if necessary. It is about.

In case of installing CT, CP and electricity meter in combination with any large customer, there is no indication on electricity meter even if it is wrong or unwired. Or, there is a problem in that it is not possible to display an artificially generated image or to store information.

In other words, the connection of CT, CP and power meter is complicated, resulting in many incorrect and unconnected wires and it is very difficult to identify them. In addition, there is a case of under-billing electricity charges due to incorrect and unwired wires, and friction with customers occurs when charges are reclaimed at the time of incorrect wires are found.

In addition, natural (lightning, overload, etc.), if the artificial phase is missing, it is difficult to determine the time of occurrence, it is difficult to scientifically calculate the unmetered power consumption.

In addition, it requires a lot of manpower and time, such as the need to visit the site periodically to check for incorrect wiring and open phase.If the site test cycle is long, the unmetered power amount is considerable and the charge is recovered by the customer's reaction. A difficult case arises.

In addition, in order to get rid of electric charges, there is a problem in that it is impossible to recognize when an artificial phase loss occurs at a consumer side for a certain period of time and a recovery action is made.

Therefore, the present invention has been devised to solve the conventional problems as described above. Even when incorrect wiring and unconnected wires occur when laying by combining CT, CP and power meter, it can be detected immediately, and after laying The function of displaying whether there is a faulty or unconnected or missing (voltage, current) in the data display, which is one of the components of the electronic watt-hour meter, to solve the problem by detecting the missing phase and storing the lost time and displaying the data if necessary. It is to provide an electronic electricity meter with an information storage function.

1 is a block diagram showing the configuration of an electronic electricity meter according to the present invention.

-Description of the main symbols in the drawings-

1S, 2S, 3S; Power supply side 1L, 2L, 3L; General load

110; A power supply circuit 111; Power transformer

112; Power supply circuit 113; Power failure compensation department

120; Power / frequency converter 121; Instrument transformer

122; Current transformer 123; Multiplier

124; Frequency converter 130; Digital circuit part

131; CPU 132; RTC

133; Crystal 134; EEPROM

135; RAM / ROM 136; Battery watch

137; Operation switch 140; Data display part

141; LCD

In order to achieve the above object, the electronic watt hour meter according to the present invention includes a power supply circuit unit connected between a power supply side and a general load to supply operating power to each circuit unit; Connected between the power supply side and the general load, converts the supplied general-purpose power into voltage and current of several volts, multiplies it, and modulates the pulse width, and also converts the frequency into a frequency proportional to the amount of power by the pulse width modulated signal. An output power / frequency converter; Calculates and measures the amount of power used by the output signal from the power / frequency converter, and reads the phase angle and sensing values of voltage and current to determine incorrect and unconnected status. A digital circuit unit for recording and outputting a time point at which this occurs; It characterized in that it comprises a data display unit for displaying the amount of power to be displayed to the user by the output signal from the digital circuit unit, the mis-wiring and un-connected state, the time of phase loss and the like.

According to the electronic watt-hour meter according to the present invention as described above, it is possible to immediately determine at the time of the installation of the mis-wiring and unconnected when the combination of CT, CP and the wattmeter.

In addition, when a phase (voltage, current) is formed by a natural or artificial method, it can be checked on the LCD display during the field reading.

In addition, in the case of a remote meter reading system can check whether there is a miswiring or missing phase without visiting the site, it is possible to omit the regular site test to save manpower and cost.

In addition, through the storage function, it is possible to acquire incorrect wiring and phase loss information for a certain period of time, thereby identifying and preventing challenging behaviors such as instrument operation, and also to accurately calculate the unmetered amount of power by using the storage information. Settlement costs can be reduced.

In addition, even during field meter reading, it is possible to check whether there is a miswiring or missing phase through the data display unit, so that the abnormal state is not left for a long time, thereby recovering the unmetered electricity rate more quickly than before.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a block diagram showing the configuration of an electronic electricity meter according to the present invention.

As shown, the present invention is largely composed of four blocks of the power circuit unit 110, the power / frequency conversion unit 120, the digital circuit unit 130 and the data display unit 140, it will be described sequentially.

First, the power supply circuit unit 110 is connected between the power supply sides 1S, 2S, and 3S and the general loads 1L, 2L, and 3L. The power circuit unit 110 is composed of a power transformer 111, a power circuit 112, the power failure compensation unit 113, the power transformer 111 is connected to the power supply side (1S, 2S, 3S) on the primary side. The output is connected in series to the power supply circuit 112. In addition, the output of the power supply circuit 112 is supplied to the operating power of each circuit portion. The power failure compensator 113 is an auxiliary operation power supply circuit which is supplied to maintain various data of the meter and the electronic clock at the time of power failure.

Subsequently, a power / frequency converting unit 120 is connected between the power supply side 1S, 2S, 3S and the normal loads 1L, 2L, 3L. The power / frequency converter 120 includes an instrument transformer 121, a current transformer 122, a multiplier 123, and a frequency converter 124. The instrument transformer 121 is connected in parallel with the power supply side (1S, 2S, 3S) receives an input, the general current transformer 122 is connected in series with the power supply side (1S, 2S, 3S) receives an input. Each voltage and current signal output from the instrument transformer 121 and the current transformer 122 are input to the multiplier 123, and the multiplier 123 multiplies the current and the voltage to output the frequency converter 124. . In addition, the frequency converter 124 outputs a frequency proportional to power to the digital circuit unit 130 to be described below.

The digital circuit unit 130 includes a CPU 131, an RTC 132, a crystal 133, an EEPROM 134, a RAM / ROM 135, a battery monitoring unit 136, an operation switch 137, and the like. . The frequency output from the frequency converter 124 of the power / frequency converter 120 is applied to the CPU 131. The RTC 132 inputs data in seconds to the CPU 131, and the Crystal 133 inputs a division period signal for dividing a frequency of the frequency converter 124 into the CPU 131. The EEPROM 134 is provided as a means for storing data quantified in the CPU 131 in a nonvolatile memory, and the RAM / ROM 135 stores data and cumulative information quantified in the CPU 131. Or as a means of reading. The battery monitoring unit 136 detects a battery low voltage and inputs it to the CPU 131. In addition, the CPU 131 outputs a predetermined signal to the data display unit 140 to inform the user of the operation and contents of various data.

The data display unit 140 includes an LCD 141 that displays contents to be displayed to the user by the CPU 131. The input of the LCD 141 is data outputted by the CPU 131.

Referring to the operation and operation of the electronic electricity meter according to the present invention of such a configuration as follows.

First, the power circuit unit 110 is a means for supplying the operating power to each circuit portion, as described above, the power transformer 111, the power circuit 112, the power failure compensation unit 113.

The power transformer 111 has a primary side connected to the power sides 1S, 2S, and 3S, and the output of the power circuit 112 converted to direct current is supplied to the power of each circuit unit. Of course, the power failure compensation unit 113 maintains various data stored in the CPU 131 and the RAM / ROM 135 of the digital circuit unit 130 at the time of power failure, and also maintains the time operation of the RTC 132. .

Subsequently, the power / frequency converting unit 120 converts general-purpose power supplied from a power supply company into voltage and current of several volts using the instrument transformer 121 and the current transformer 122.

Thereafter, the voltage and current signals are output to the multiplier 123, and the multiplier 123 performs pulse width modulation by a multiplication operation.

In addition, the frequency converter 124 converts the pulse width modulated signal by the multiplier 123 into a frequency and outputs the frequency.

Here, the frequency converter 124 detects an incorrect connection or an unconnected voltage or current. That is, in the case of a wrong connection, the phase angle of voltage and current is compared using the phase angle of a normal connection, and in case of an unconnected connection, an error occurs in the CPU 131 of the digital circuit unit 130 when there is no sensing value of voltage and current. Be notified.

In addition, when the imaging occurs naturally and artificially after laying, the time at which the imaging occurs is stored in the EEPROM 134 so that the data can be displayed and checked when necessary.

Subsequently, the CPU 131 of the digital circuit unit 130 is divided by the crystal 133 which generates a constant division period of the frequency signal output from the frequency converter 124 to calculate and measure the amount of used power kWh. .

In addition, the phase angles of voltage and current are measured, and the sensing values of voltage and current are read to determine the erroneous and unconnected states of voltage and current.

On the other hand, the cumulative amount of power used to store the measurement data even in the event of a power outage, and also records the time at which the natural phase artificially occurred after installation in the EEPROM (134). Of course, the RAM / ROM 135 is used to record the previous month and the previous month power consumption data.

In addition, the battery monitoring QN 136, which always monitors the remaining battery during the normal operation of the device, inputs a battery low voltage signal (Battery Low Voltage) to the CPU 131 when the remaining battery voltage falls below a predetermined level, and the CPU ( 131 outputs a battery low voltage error indication signal to the LCD 141 of the data display unit 140.

In addition, the RTC 132 provides accurate current time information to the CPU 131, and the CPU 131 continuously records the current time.

In addition, the operation switch 137 allows to set various set values and time freely.

Subsequently, the data display unit 140 includes an LCD 141 which displays the contents to be displayed to the user by the CPU 131. The contents displayed on the LCD 141 include the current month / month cumulative usage items, battery voltage error and voltage, current misconnection and non-connection status, and time at which an imaging occurs.

As described above, although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto, and various modified embodiments may be possible without departing from the scope and spirit of the present invention.

Therefore, the electronic wattmeter according to the present invention has the following effects.

First, the combination of CT, CP and the electricity meter has an effect that can immediately determine whether the wiring is wrong or unwired when laying.

Second, when the phase (voltage, current) is formed by a natural or artificial method, there is an effect that can be confirmed on the LCD display during the meter reading.

Third, in the case of the remote meter reading system, it is possible to check the wiring or the absence of missing phases without visiting the site, and thus it is possible to omit regular field tests, thereby reducing the manpower and cost.

Fourth, through the storage function, you can acquire wrong wiring and phase loss information for a certain period of time, so that you can identify and prevent challenging behavior such as instrument operation, and you can calculate the amount of unmetered power more accurately by using the storage information. It is effective to reduce settlement costs.

Fifth, since the presence of incorrect wiring and phase loss can be confirmed through the data display unit during the field reading, the abnormal state is not left for a long time, so that the unmetered electric charge can be recovered more quickly than before.

Claims (1)

A power supply circuit portion connected between the power supply side and the general load to supply operation power to each circuit portion; Connected between the power supply side and the general load, converts the supplied general-purpose power into voltage and current of several volts, multiplies it, and modulates the pulse width, and also converts the frequency into a frequency proportional to the amount of power by the pulse width modulated signal. An output power / frequency converter; Calculates and measures the amount of power used by the output signal from the power / frequency converter, and reads the phase angle and sensing values of voltage and current to determine incorrect and unconnected status. A digital circuit unit for recording and outputting a time point at which this occurs; And a data display unit for displaying the amount of power to be displayed to the user, the status of the wrong and unconnected states, the time of the phase loss, etc. by the output signal from the digital circuit unit.