KR102314991B1 - Ami system and method for detecting phase in multiple access between a modem and electric meters - Google Patents

Abstract

The present invention relates to a remote meter reading system and method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter, and the remote meter reading system for phase detection of a multi-connection watt-hour meter according to an embodiment of the present invention is provided to a consumer a watt-hour meter that transmits a phase detection signal of electricity; and a meter-reading modem for determining the phase of the watt-hour meter by comparing the transmitted phase detection signal with the self-generated phase detection signal, wherein the meter-reading modem obtains the phase information of the watt-hour meter multiplely connected to the lower portion. can be transmitted to the data concentrator.

Description

Remote meter reading system and method for phase detection in multiple connection configuration between meter reading modem and watt-hour meter

The present invention relates to a remote meter reading system and method for phase detection in a multi-connected configuration using a shared communication line between one meter reading modem and a plurality of watt-hour meters. Multiple connection between the meter reading modem and the watt-hour meter to collect phase information on electricity supplied by low voltage consumers by comparing the time difference between the phase detection signal and the phase detection signal of the meter reading modem (or data concentrator) to determine the phase of the corresponding watt-hour meter A remote meter reading system and method for phase detection in a configuration.

In general, when three coils with the same winding are wound around an iron core at 120° intervals at an electrical angle and rotated at a constant angular speed, three-phase currents with different phases and the same amplitude are generated in each coil.

In the distribution system, if the phase information of the accurate current supplied to the customer can be confirmed, the imbalance of the load occurring between the three phases supplied to the customer can be minimized. That is, in the distribution system, it is possible to optimize the quality of electricity such as supplied voltage and harmonics, to make an efficient investment in power facilities, or to reduce power supply loss or equipment failure due to reduction of unbalanced current.

However, in the distribution system, it is difficult to establish the phase information of the power supplied to the customer because the customer in the distribution system is connected to the distribution supply line and the load condition (ie, remodeling, moving, new construction, change, etc.) frequently changes. the current situation.

Therefore, in the distribution system, it is necessary to detect the power phase and to minimize the load imbalance occurring between the three phases supplied to the customer. In this regard, a technology for detecting a power phase in a distribution system has been proposed in Korean Patent No. 594,778. That is, in Korean Patent Registration No. 594,778, many sampling signals are collected using a DSP device and an AD converter to detect a power phase, and a high-speed program and processing algorithm are used.

However, in the conventional method, it is necessary to propose a method for collecting power phase information by adding a simple and inexpensive device to an Advanced Measuring Infrastructure (AMI).

Republic of Korea Patent Publication No. 10-0594778

An object of the present invention is to determine the phase of the watt-hour meter by comparing the time difference between the phase detection signal of the watt-hour meter multi-connected to the lower part of the meter-reading modem and the phase detection signal of the meter-reading modem (or data concentrator) to provide electricity to low-voltage consumers. An object of the present invention is to provide a remote meter reading system and method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter for collecting phase information for

A remote meter reading system for detecting the phase of a multi-connection meter according to an embodiment of the present invention includes: a meter for transmitting a phase detection signal of electricity supplied to a consumer; and a meter-reading modem for determining the phase of the watt-hour meter by comparing the transmitted phase detection signal with the self-generated phase detection signal, wherein the meter-reading modem obtains the phase information of the watt-hour meter multiplely connected to the lower portion. can be transmitted to the data concentrator.

In addition, according to another embodiment of the present invention, a remote meter reading system for phase detection of a multi-connection watt-hour meter includes: a watt-hour meter for transmitting a phase detection signal of electricity supplied to a consumer; a meter reading modem for transmitting a phase detection packet in which the transmitted phase detection signal is synchronized with a state change of a signal line connected to the watt-hour meter; and a data concentrator for determining the phase of the watt-hour meter by comparing the transmitted phase detection packet with the self-generated phase detection signal.

The watt-hour meter and the meter reading modem may be switched to a phase detection mode in which the daily communication mode is stopped and the phase of electricity supplied by the consumer is detected.

The watt-hour meter may be switched to the phase detection mode only one at a time to detect the phase of electricity supplied to the consumer.

The watt-hour meter and the meter reading modem may operate in the phase detection mode according to a predetermined operation time.

The watt-hour meter may use a Zero Crossing Detect technique for detecting the phase of the consumer.

The watt-hour meter and the meter reading modem are connected by a signal line using any one of RS-485, RS-232, and RS-422, and form a selective path between the phase detection signal and the general signal transmitted through the signal line. can do.

The meter reading modem may generate a phase detection signal by itself using a zero crossing detection technique.

On the other hand, a remote meter reading method for phase detection of a multi-connection watt-hour meter according to an embodiment of the present invention comprises: switching a meter-reading modem and a multi-connected watt-hour meter under the meter-reading modem from a daily communication mode to a phase detection mode; transmitting, by the watt-hour meter, a phase detection signal to the meter reading modem; determining, by the meter reading modem, the phase of the watt-hour meter by comparing the transmitted phase detection signal with the self-generated phase detection signal; and collectively acquiring, by the meter reading modem, the phase information of the watt-hour meter connected to the lower part, and transmitting the phase information to a data concentrator.

In addition, according to another embodiment of the present invention, a remote meter reading method for detecting a phase of a multi-connection watt-hour meter includes: switching a meter-reading modem and a multi-connected watt-hour meter under the meter-reading modem from a daily communication mode to a phase detection mode; transmitting, by the watt-hour meter, a phase detection signal to the meter reading modem; transmitting, by the meter reading modem, a phase detection packet synchronized with the transmitted phase detection signal to a data concentrator at a time point of a state change of a signal line connected to the watt-hour meter; and determining, by the data concentrator, the phase of the watt-hour meter by comparing the transmitted phase detection packet with the self-generated phase detection signal.

The present invention compares the time difference between the phase detection signal of the watt-hour meter multi-connected to the lower part of the meter-reading modem and the phase detection signal of the meter-reading modem (or data concentrator) to determine the phase of the corresponding watt-hour meter to determine the phase of the electricity supplied by the low-voltage consumer information can be collected.

In addition, the present invention can detect the phase of the consumer in a configuration in which one modem and a plurality of watt-hour meters are connected.

In addition, the present invention can consistently manage the wide-area phases of substations and distribution lines on a nationwide scale, and accurately identify customers for each phase of a transformer on a distribution line, so that it is possible to easily manage conduction and leakage by phase.

In addition, the present invention is highly economical because phase detection can be performed by adding simple and inexpensive parts to the modem and the data concentrator (DCU).

1 is a diagram of a remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a power meter according to an embodiment of the present invention;
Figure 2ab is a view showing the operating state of the watt-hour meter and the meter reading modem according to the PD-SW;
3 is a view for explaining an example of determining a phase through a relative time difference of a phase detection signal;
4 is a diagram of a remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to another embodiment of the present invention;
5A is a diagram of a remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to an embodiment of the present invention;
5B is a diagram of a remote meter reading method for detecting a phase in a multi-connection configuration between a meter reading modem and a watt-hour meter according to another embodiment of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. This example is provided to more completely explain the present invention to those of ordinary skill in the art. Accordingly, the shape of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. Detailed descriptions of well-known functions and configurations determined to unnecessarily obscure the gist of the present invention will be omitted.

1 is a diagram of a remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to an embodiment of the present invention.

As shown in FIG. 1 , a remote meter reading system (hereinafter referred to as “remote meter reading system”, 100) for detecting the phase of a multi-connection power meter according to an embodiment of the present invention includes a power meter 110 and a meter reading modem 120. ), a data collection unit (DCU) 130 , and an AMI server 140 .

Here, one data concentrator 130 may be connected to a plurality of meter reading modems 120, and each meter reading modem 120 may be connected to individual watt-hour meters (#1 to #N) and multiple connection structures (1:N). have.

However, in order to detect the phase of electricity supplied to the consumer, the watt-hour meter 110 stops the normal communication state and transmits a signal related to phase detection (ie, a phase detection signal) to the meter reading modem 120. can

In order to clearly distinguish and explain a case of detecting a phase and a case of a normal case, the remote meter reading system 100 is divided and described as operating by distinguishing the following modes. That is, the corresponding modes are 'mode for detecting the phase of electricity supplied to consumers' (hereinafter referred to as 'phase detection mode') and 'mode for performing meter reading or network management (NMS)' (hereinafter 'daily communication mode'). ) are separated. Accordingly, the watt-hour meter 110 and the meter reading modem 120 operate in either the phase detection mode or the daily communication mode, and both operate in the same mode.

Hereinafter, components of the remote meter reading system 110 will be described.

The watt-hour meter 110 measures the total amount of power used for a certain period and displays the meter reading data required for billing on its own display (LCD screen), or transmits the meter reading data to the data concentrator 130 through the meter reading modem 120. can In addition, the watt-hour meter 110 and the meter reading modem 120 may maintain a general network management state. Such cases may be regarded as cases in which the watt-hour meter 110 and the meter reading modem 120 operate in the daily communication mode.

In addition, when the watt-hour meter 110 operates in the phase detection mode as described above, it may transmit the phase detection signal to the meter reading modem 120 . In this case, the watt-hour meter 110 may use a Zero Crossing Detect (ZCD) technique to detect the phase of electricity supplied to the consumer. In this case, the phase detection signal may correspond to a ZCD signal. However, the watt-hour meter 110 does not limit and use only the zero-crossing detection technique when detecting the phase of electricity supplied to the consumer.

Meanwhile, in the watt-hour meter 110 , control information for operating in the phase detection mode may be set by the meter reading modem 120 . The control information for operating in the phase detection mode includes 'ON/OFF switching of the function to transmit the phase detection and phase detection signal' (hereinafter referred to as 'PD-SW') and the function to transmit the phase detection and phase detection signal. Information on 'operation time' (hereinafter referred to as 'PD-Time') is included. Here, the phase detection mode is when the PD-SW is in the ON state, and the daily communication mode is when the PD-SW is in the OFF state.

Specifically, the watt-hour meter 110 operates in the phase detection mode according to the state of 'PD-SW' and transmits the phase detection signal to the meter reading modem 120 .

In addition, the watt-hour meter 110 determines the holding time of the phase detection mode by counting using an internal clock according to 'PD-Time'. That is, when the PD-Time has elapsed, the watt-hour meter 110 automatically ends the phase detection mode and returns to the daily communication mode. When the PD-Time has elapsed, the watt-hour meter 110 and the meter reading modem 120 automatically switch the PD-SW to the OFF state, and the signal lines between the two (RS-485, RS-232, RS-422, etc.) is also converted to a communication enabled state. This can improve reliability because it returns to a normal state after a certain period of time has elapsed even in the case of an erroneous operation.

The meter reading modem 120 provides a communication function between the watt-hour meter 110 and the data concentrator 130 . The meter reading modem 120 may be managed by an upper relay modem (not shown) if necessary.

First, the meter reading modem 120 may operate as follows as a subject for determining the phase of electricity supplied to the consumer.

When the meter reading modem 120 operates in the phase detection mode, it sequentially detects the phase of the watt-hour meter 110 connected to the lower part. At this time, the meter reading modem 120 sequentially detects the phases for each of the individual watt-hour meters #1 to #N. Accordingly, the meter reading modem 120 repeats the same operation to acquire all phase information for all customers. To this end, the meter reading modem 120 sets a control signal (ie, PD-SW, PD-Time) for operating in the phase detection mode for each watt-hour meter 110 .

To this end, the meter reading modem 120 has an internal configuration for measuring its own phase detection signal (a second phase detection signal generator to be described later), and the phase of the watt-hour meter 110 based on the phase detection signal of the corresponding internal configuration. Information can be collected autonomously. In this case, the meter reading modem 120 may use a zero-crossing detection technique like the watt-hour meter 110 . The phase detection signal of the meter reading modem 120 may correspond to a ZCD signal. The meter reading modem 120 determines the phase of the watt-hour meter 110 by comparing the time difference between the watt-hour meter 110 and its own phase detection signal. At this time, the meter reading modem 120 determines the generation phase of the most recent phase detection signal (ZCD signal) as the phase of the corresponding watt-hour meter 110 . The meter reading modem 120 may collectively transmit the phase information of the watt-hour meter 110 connected to the lower part to the data concentrator 130 .

Next, the meter reading modem 120 may serve to transmit the phase detection signal transmitted from the watt-hour meter 110 to the data concentrator 130 . At this time, the subject that determines the phase of electricity supplied to the consumer is the data concentrator 130 . At this time, the meter reading modem 120 transmits the phase detection signal transmitted from the watt-hour meter 110 to the state change time (ie, high → low or low → signal bus such as RS-485, RS-232, RS-422). high) and transmits a preset specific signal (pilot signal) or phase detection packet to the data concentrator 130 . The data concentrator 130 determines the phase of the watt-hour meter 110 by comparing the reception time of a specific signal or phase detection packet with the time difference of the self-generated phase detection signal. In this case, the internal configuration of the meter reading modem 120 for generating a phase detection signal by itself (a second phase detection signal generator to be described later) may be omitted.

Meanwhile, the meter reading modem 120 performs normal data modulation/demodulation for communication with the data concentrator 130 .

The data concentrator 130 periodically collects meter reading data from the watt-hour meter 110 installed in the consumer and transmits the collected meter reading data to the AMI server 140 upon request. Such a data concentrator 130 is generally logically/physically installed on a utility pole (electric pole in which a transformer is installed) located between the watt-hour meter 110 and the AMI server 140 .

The data concentrator 130 may receive the phase information of the watt-hour meter 110 from the meter reading modem 120 in a batch. At this time, the meter reading modem 120 performs as a subject for determining the phase of the watt-hour meter 110 . In this way, when the meter-reading modem 120 detects the phase of the watt-hour meter 110, the meter-reading modem 120 detects all the phases for the watt-hour meter 110 connected to the lower part, and then the meter-reading modem 120 collectively detects the phase. Since the phase information of the watt-hour meter 110 can be transmitted to the data concentrator 130, the processing method of the system can be simplified.

Meanwhile, the data concentrator 130 may determine the phase of the watt-hour meter 110 multiplexed to the lower portion of the meter reading modem 120 instead of the meter reading modem 120 . In this case, the data concentrator 130 receives the phase detection packet for the phase detection signal of the watt-hour meter 110 through the meter reading modem 120 and determines the phase of the watt-hour meter 110 . That is, the data concentrator 130 compares the reception time of the phase detection packet with the time difference with the phase detection signal generated by itself, and sets the generation phase of the most recent phase detection signal (ZCD signal) as the phase of the corresponding watt-hour meter 110 . judge

In addition, the meter reading modem 120 and the data concentrator 130 manage basic information (ie, ID, communication address, number, etc.) of the watt-hour meter 110 multi-connected to the lower part of the meter reading modem 120 at the time of initial startup. do. Accordingly, the meter reading modem 120 may sequentially detect the phase of the watt-hour meter 110 connected to the lower part.

The AMI server 140 performs a function of reading the power usage of each customer in a preset time unit and storing it. In addition, the AMI server 140 calculates billing information according to the power consumption of each customer. In this case, the AMI server 140 may be connected to the data concentrator 130 through a typical communication network (eg, CDMA, Wibro, HFC, etc.).

Figure 2ab is a diagram showing the operating state of the watt-hour meter and the meter reading modem according to the PD-SW. FIG. 2A shows a case in which the phase detection signal of the watt-hour meter 110 is transmitted to the meter reading modem 120 as a case of operating in the phase detection mode (ie, the PD-SW is in the ON state), and FIG. 2B shows the daily communication mode (ie. , PD-SW is in the OFF state), indicating a case in which the general communication state is maintained between the watt-hour meter 110 and the meter reading modem 120 .

Here, a case in which the meter reading modem 120 functions as a main body for determining the phase of the watt-hour meter 110 will be described.

2A and 2B , the watt-hour meter 110 and the meter reading modem 120 use two lines of the signal line RS-485 for the phase detection mode and the daily communication mode.

First, the watt-hour meter 110 includes a watt-hour meter controller 111 , a first phase detection signal generator 112 , a multiplexer 113 , and a first communication driver 114 .

Here, the watt-hour meter 110 and the meter reading modem 120 may apply a serial-type asynchronous method for mutual information exchange, but is not limited thereto. When the asynchronous method is applied, the watt-hour meter control unit 111 and the modem control unit 121 include a universal asynchronous receiver/transmitter (UART) having an asynchronous communication function. However, since the signal from the UART usually has the level of the TTL (Transistor Transistor Logic) signal, it is weak against noise and has a limitation in communication distance. For this reason, the first communication driver 114 and the second communication driver 124 receive a TTL signal and are strong against noise and transmit far away, and may be drivers such as RS-232, RS-422, and RS-485. have.

The watt-hour meter control unit 111 operates each component in the phase detection mode or daily communication mode according to a control signal for operating in the phase detection mode set by the meter reading modem 120 .

When the watt-hour meter control unit 111 operates in the daily communication mode, it communicates with the meter reading modem 120 through the multiplexing unit 113 and the first communication driver 114 for a general signal (RS-485 signal).

When the first phase detection signal generator 112 operates in the phase detection mode, it detects a phase and transmits the phase detection signal to the meter reading modem 120 through the multiplexer 113 and the first communication driver 114 . .

The multiplexing unit 113 selectively multiplexes and processes the general signal (ie, RS-485 signal) output by the watt-hour meter control unit 111 and the phase detection signal generated by the first phase detection signal generation unit 112 . . Here, the multiplexer 113 corresponds to 2x1 MUX (multiplexing). At this time, the multiplexing unit 113 performs a selective multiplexing function according to the PD-SW state of the watt-hour meter control unit 111 . That is, the multiplexer 113 forms a signal path for transmitting the phase detection signal to the meter reading modem 120 when the PD-SW is in the ON state. On the other hand, when the PD-SW is in the OFF state, the multiplexer 113 selects a signal path for transmitting the general signal to the meter reading modem 120 . Signal paths are indicated by dotted lines in FIGS. 2A and 2B, respectively.

Next, the meter reading modem 120 includes a modem controller 121 , a second phase detection signal generator 112 , a demultiplexer 123 , and a second communication driver 124 .

The modem controller 121 sets a control signal (ie, PD-SW, PD-Time) for operating in the phase detection mode for the watt-hour meter 110 . At the same time, the modem control unit 121 also sets each component of the meter reading modem 120 to the phase detection mode.

In addition, as the modem control unit 121 operates in the phase detection mode, it sequentially detects the phase of the watt-hour meter 110 connected to the lower portion. At this time, the modem control unit 121 sets the PD-SW of one watt-hour meter 110 to the ON state at a time, and sets the PD-SW to the ON state.

The demultiplexer 123 selectively demultiplexes and processes the signal transmitted from the watt-hour meter 110 . At this time, the demultiplexer 123 performs a selective demultiplexing function according to the PD-SW state set by the modem controller 121 .

First, when the PD-SW is in the ON state, the demultiplexer 123 selects a signal path for processing the phase detection signal transmitted from the watt-hour meter 110 . Here, the demultiplexer 123 corresponds to 1×2 Demultiplexing (DEMUX). At this time, the demultiplexer 123 is a signal path for comparing the time difference between the 'phase detection signal transmitted from the watt-hour meter 110' and the 'phase detection signal generated by the second phase detection signal generator 122' can be selected. Here, the modem control unit 121 to which the 'phase detection signal transmitted from the watt-hour meter 110' and the 'phase detection signal generated by the second phase detection signal generating unit 122' are input is a general purpose input/output port (General Purpose Input) /Output, GPIO) may be provided. In addition, when the PD-SW is in the OFF state, the demultiplexer 123 selects a signal path for processing the general signal transmitted from the watt-hour meter 110 . Signal paths are indicated by dotted lines in FIGS. 2A and 2B, respectively.

The second phase detection signal generator 122 may be provided when the meter reading modem 120 operates as a main body for detecting the phase of the watt-hour meter 110 . The second phase detection signal generating unit 122 may be provided as an additional configuration when the meter reading modem 120 has a commercial power line such as a power line communication modem (PLC modem). In this case, the modem controller 121 may autonomously collect the phase detection signal of the first phase detection signal generator 112 based on the phase detection signal of the second phase detection signal generator 122 . Accordingly, the modem control unit 121 determines the phase of the watt-hour meter 110 using the time difference between the phase detection signals between the first phase detection signal generation unit 112 and the second phase detection signal generation unit 122 .

In this case, the modem control unit 121 collects all the phase detection signals of the watt-hour meter 110 multi-connected to the lower part of the meter reading modem 120 and transmits them collectively to the data concentrator 130 . In this case, in order to collect the phase detection signal of the watt-hour meter 110 , the modem control unit 121 does not need to perform packet transmission/reception or interaction with the data concentrator 130 . This may be an advantage of simplifying the processing method of the system for collecting the phase detection signal of the watt-hour meter 110 . Here, the meter reading modem 120 may know in advance its own phase information by performing mutual communication with the data concentrator 130 in advance.

On the other hand, when the data concentrator 130 operates as the main body for determining the phase of the watt-hour meter 110 , the modem control unit 121 receives the phase detection signal transmitted from the watt-hour meter 110 when the PD-SW is in the ON state. (digital value) is synchronized with the state change point of the communication line (RS-485) (that is, high → low or low → high) and transmits a preset specific signal (pilot signal) or phase detection packet to the data concentrator 130 do. That is, the data concentrator 130 determines the phase of the watt-hour meter 110 using the received specific signal or the phase detection packet.

3 is a view for explaining an example of determining a phase through a relative time difference of a phase detection signal.

For example, in a multi-family house, a plurality of watt-hour meters 110 are installed in the same house, each watt-hour meter 110 is connected to a different electrical phase, and the meter reading modem 120 may also be mounted on any one phase.

If the meter reading modem 120 knows the phase information of the electricity it is attached to, the phase detection signal (ZCD signal) generated from a plurality of watt-hour meters 110 mounted in the same house from the relative difference with its own phase detection signal The electric phase of the corresponding watt-hour meter 110 may be determined using the time difference.

If the supplied electricity is 60Hz, one cycle is 16.7ms. Since the phase difference of the three phases is 120°, the phase time difference between the adjacent phases is 16.7 ms/3 = 5.5 ms. Here, 5.5 ms corresponds to 'T'. Accordingly, the phase detection signal for each phase is generated as a multiple of T.

Referring to FIG. 3 , when it is known that the meter reading modem 120 is mounted on the 'C phase' and receives the 'B phase' phase detection signal from the watt-hour meter 110, the phase of the watt-hour meter 110 is determined as follows. judge After receiving the phase detection signal from the watt-hour meter 110, the meter reading modem 120 generates its own phase detection signal after T. Accordingly, the meter reading modem 120 may determine the phase of the watt-hour meter 110 .

4 is a diagram of a remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to another embodiment of the present invention.

4 shows a case in which two signal lines (RS-485 bus) and one phase detection signal bus line (ie, a connection using three lines) are respectively configured between the watt-hour meter 210 and the meter reading modem 220 .

The watt-hour meter 210 outputs only one phase and blackout detection signal at a time.

In addition, the signal lines of the phase and blackout detection signals are connected to the meter reading modem 220 by tying the signal lines of the plurality of watt-hour meters 210 into one signal line in an open collector method.

The meter reading modem 220 remotely controls the output of the phase and the blackout detection signal of the watt-hour meter 210 . In addition, the meter reading modem 220 may transmit a predetermined specific signal (pilot signal) or packet to the data concentrator 230 in synchronization with the phase and blackout detection signals.

5A is a diagram illustrating a remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to an embodiment of the present invention.

When the watt-hour meter 110 and the meter reading modem 120 start phase detection, they stop the general communication mode and switch to the phase detection mode (S201). At this time, the PD-SW is in an ON state.

Then, the watt-hour meter 110 transmits the phase detection signal to the meter reading modem 120, and the meter reading modem 120 checks its own phase detection signal (S202).

Thereafter, the meter reading modem 120 compares the time difference between the phase detection signal of the watt-hour meter 110 and the phase detection signal generated by the self-generated phase detection signal to determine the phase of the corresponding watt-hour meter 110 ( S203 ). At this time, the meter reading modem 120 determines the generation phase of the most recent phase detection signal (ZCD signal) as the phase of the corresponding watt-hour meter 110 based on the self-generated phase detection signal.

The meter reading modem 120 determines the phase information of the watt-hour meter 110 that is multi-connected to the lower part, and transmits it to the data concentrator 130 at once (S204). That is, the meter reading modem 120 repeats the same operation for all watt-hour meters 110 below to acquire all phase information for all consumers, and transmits them to the data concentrator 130 at once.

Thereafter, when the PD-Time elapses, the watt-hour meter 110 and the meter reading modem 120 stop the phase detection mode and switch to the daily communication mode (S205). PD-SW is turned OFF.

5B is a diagram of a remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter according to another embodiment of the present invention.

When the watt-hour meter 110 and the meter reading modem 120 start detecting the phase, they stop the general communication mode and switch to the phase detection mode (S211). At this time, the PD-SW is in an ON state. In this case, the watt-hour meter 110 and the meter reading modem 120 are set to the phase detection mode according to the control by the data concentrator 130 .

Then, the watt-hour meter 110 transmits the phase detection signal to the meter reading modem 120, and the meter reading modem 120 synchronizes the phase detection signal of the watt-hour meter 110 at the time when the state of the signal line is changed to concentrate the phase detection packet data. It is transmitted to the device 130 (S202). At this time, the meter reading modem 120 repeatedly transmits the phase detection packet at regular time intervals before receiving the command to cancel the phase detection mode of the data concentrator 130 .

The data concentrator 130 compares the reception time of the phase detection packet with the time difference of its own phase detection signal to determine the phase of the corresponding watt-hour meter (S213).

Thereafter, when the PD-Time has elapsed, the watt-hour meter 110 and the meter reading modem 120 stop the phase detection mode and switch to the daily communication mode (S214). At this time, the data concentrator 130 transmits a release command of the phase detection mode to the meter reading modem 120 and waits for the watt-hour meter 110 to return to the daily communication mode after the PD-Time has elapsed. PD-SW is turned OFF.

The embodiments of the present invention described above are merely exemplary, and those of ordinary skill in the art to which the present invention pertains will appreciate that various modifications and equivalent other embodiments are possible therefrom. Accordingly, it will be understood that the present invention is not limited to the form mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. Moreover, it is to be understood that the present invention covers all modifications, equivalents and substitutions falling within the spirit and scope of the invention as defined by the appended claims.

110: watt-hour meter 111: watt-hour meter control unit
112: first phase detection signal generator 113: multiplexer
114: first communication driver 120: meter reading modem
121: modem control unit 122: second phase detection signal generation unit
123: demultiplexer 124: second communication driver
130: data concentrator (DCU) 140: AMI server

Claims (10)

a watt-hour meter that transmits a phase detection signal of electricity supplied to consumers; and
a meter reading modem for determining the phase of the watt-hour meter by comparing the time difference between the transmitted phase detection signal and the self-generated phase detection signal;
The watt-hour meter and the meter reading modem operate by switching to any one of a phase detection mode for detecting the phase of electricity supplied to consumers and a daily communication mode for performing meter reading or network management, and the watt-hour meter and the meter reading modem are works in the same mode,
The meter reading modem is configured to set control information for the watt-hour meter to operate in the phase detection mode, and the control information is ON/OFF of a function of transmitting the phase detection and phase detection signals of electricity supplied to the consumer to the meter reading modem Includes information on switching and operating time,
The meter-reading modem, a remote meter-reading system for phase detection in a multi-connection configuration between the meter-reading modem and the watt-hour meter, characterized in that the phase information of the watt-hour meter connected to the lower part of the watt-hour meter is collectively acquired and transmitted to a data concentrator.
a watt-hour meter that transmits a phase detection signal of electricity supplied to consumers;
a meter reading modem for transmitting a phase detection packet in which the transmitted phase detection signal is synchronized with a state change of a signal line connected to the watt-hour meter; and
a data concentrator for determining the phase of the watt-hour meter by comparing the time difference between the transmitted phase detection packet and the self-generated phase detection signal;
The watt-hour meter and the meter reading modem operate by switching to any one of a phase detection mode for detecting the phase of electricity supplied to consumers and a daily communication mode for performing meter reading or network management, and the watt-hour meter and the meter reading modem are works in the same mode,
The meter reading modem is configured to set control information for the watt-hour meter to operate in the phase detection mode, and the control information is ON/OFF of a function of transmitting the phase detection and phase detection signals of electricity supplied to the consumer to the meter reading modem A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a power meter, characterized in that it includes information on switching and operation time.
delete 3. The method of claim 1 or 2,
The power meter is
A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter, in which only one is switched to the phase detection mode at a time to detect the phase of electricity supplied to the consumer.
5. The method of claim 4,
The watt-hour meter and the meter reading modem are
A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter, which automatically terminates the phase detection mode and returns to the daily communication mode when a predetermined operation time elapses.
3. The method according to claim 1 or 2,
The power meter is
A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter using a Zero Crossing Detect technique to detect the phase of the consumer.
3. The method according to claim 1 or 2,
The watt-hour meter and the meter reading modem are connected by a signal line using any one of RS-485, RS-232, and RS-422, and an optional path for performing the phase detection mode and the daily communication mode through the signal line A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter forming a
3. The method of claim 2,
The meter reading modem is
A remote meter reading system for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter that self-generates a phase detection signal using the Zero Crossing Detect technique.
converting the meter reading modem and the watt-hour meter connected to the lower part of the meter reading modem from the daily communication mode to the phase detection mode;
transmitting, by the watt-hour meter, a phase detection signal to the meter reading modem;
determining, by the meter reading modem, the phase of the watt-hour meter by comparing the transmitted phase detection signal with the self-generated phase detection signal; and
Including, by the meter reading modem, collectively acquiring the phase information of the watt-hour meter connected to the lower part and transmitting the phase information to a data concentrator;
The watt-hour meter and the meter reading modem operate by switching to any one of a phase detection mode for detecting the phase of electricity supplied to consumers and a daily communication mode for performing meter reading or network management, and the watt-hour meter and the meter reading modem are works in the same mode,
The meter reading modem is configured to set control information for the watt-hour meter to operate in the phase detection mode, and the control information is ON/OFF of a function of transmitting the phase detection and phase detection signals of electricity supplied to the consumer to the meter reading modem A remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter, comprising information on switching and operation time.
converting the meter reading modem and the watt-hour meter connected to the lower part of the meter reading modem from the daily communication mode to the phase detection mode;
transmitting, by the watt-hour meter, a phase detection signal to the meter reading modem;
transmitting, by the meter reading modem, a phase detection packet synchronized with the transmitted phase detection signal to a data concentrator at a time point of a state change of a signal line connected to the watt-hour meter; and
determining, by the data concentrator, the phase of the watt-hour meter by comparing the transmitted phase detection packet with the self-generated phase detection signal;
The watt-hour meter and the meter reading modem operate by switching to any one of a phase detection mode for detecting the phase of electricity supplied to consumers and a daily communication mode for performing meter reading or network management, and the watt-hour meter and the meter reading modem are works in the same mode,
The meter reading modem is configured to set control information for the watt-hour meter to operate in the phase detection mode, and the control information is ON/OFF of a function of transmitting the phase detection and phase detection signals of electricity supplied to the consumer to the meter reading modem A remote meter reading method for phase detection in a multi-connection configuration between a meter reading modem and a watt-hour meter, comprising information on switching and operation time.

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