KR20170008583A - Digital power meter and a power system inculding the same - Google Patents

Digital power meter and a power system inculding the same Download PDF

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Publication number
KR20170008583A
KR20170008583A KR1020150099934A KR20150099934A KR20170008583A KR 20170008583 A KR20170008583 A KR 20170008583A KR 1020150099934 A KR1020150099934 A KR 1020150099934A KR 20150099934 A KR20150099934 A KR 20150099934A KR 20170008583 A KR20170008583 A KR 20170008583A
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KR
South Korea
Prior art keywords
data
communication
power
digital power
monitoring
Prior art date
Application number
KR1020150099934A
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Korean (ko)
Inventor
한왕희
Original Assignee
엘에스산전 주식회사
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Priority to KR1020150099934A priority Critical patent/KR20170008583A/en
Publication of KR20170008583A publication Critical patent/KR20170008583A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
    • G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
    • G01R22/061—Details of electronic electricity meters
    • G01R22/063—Details of electronic electricity meters related to remote communication
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The present invention discloses a digital power apparatus. More particularly, the present invention relates to a power system. The power system is applied to a power measurement and relay device used in a power generation, distribution and transmission system to display communication data to a corresponding device so that an installer can quickly and accurately determine a communication problem. According to the embodiment of the present invention, a function of displaying all communication packets approaching the digital power apparatus through a display part is added, thereby providing data for promptly and accurately determining problems in the communication of the power apparatus to a user.

Description

TECHNICAL FIELD [0001] The present invention relates to a digital power device and a power system including the digital power device.

TECHNICAL FIELD The present invention relates to a digital power device, and more particularly, to a power meter and a relay device used in a power generation, distribution, and transmission system to display communication data to a corresponding device so that an installer can quickly and accurately determine a communication problem And a power system including the same.

Currently, in the field of power system, as the automation for monitoring and control of each system is performed easily and accurately, the communication function between remote monitoring system and digital power device is widely applied.

Generally, digital power equipment consists of power measurement and relay equipment. These digital power equipment protects various power systems generated from overcurrent and short-circuit accidents and calculates necessary values for various power systems including voltage and current. And a digital signal processor (DSP), a central processing unit (CPU), and other digital circuits, and an LCD, a 7-segment LED, and a light emitting diode (LED).

However, if a failure occurs in the communication between the remote monitoring system and the digital power device, the cause of the failure should be quickly and accurately identified and analyzed, and problems must be solved. It is not easy to find the cause of defects due to various kinds of communication protocols.

1 is a schematic view showing a structure of a conventional power system.

Generally, the power system includes (1) a digital power device (2) having the lowest configuration and measuring the voltage and current of the connected monitored devices and providing the result, and A monitoring device 5 and a communication relay device 7 connected to the communication network and relaying communication between the digital power device 2 and the upper monitoring device 5 through various communication protocols.

In particular, in the case of the digital power device 2 in which the electric power system 1 displays a communication state only by LEDs, it is difficult for the user to determine whether or not the device is normal since the devices of various manufacturers are mixed. In addition, when an additional device is installed in the power system 1 or when a problem occurs, it is necessary to analyze the lowest level digital power device 2. In this case, conventionally applied digital power devices 2 are connected to a separate analysis device (8) is required. Even if the analyzer 8 is provided, it is necessary not only to install equipment for long-term monitoring in the case where the error occurrence period is long in the power system 1, but also to delay the analysis time in proportion to the accumulated amount of data There is a limit.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and an object of the present invention is to provide a digital power measuring and relay device used in a power generation, distribution and transmission system, Thereby enabling a user to quickly and accurately determine events occurring in a communication network, and a power system including the same.

In order to achieve the above object, a digital power device according to a preferred embodiment of the present invention includes a communication unit for transmitting and receiving data from a communication network, a voltage-current conversion unit for sampling voltage and current of a connected monitoring target device, A memory for storing the event and power monitoring values, and a memory for storing the event and power monitoring values, wherein the controller is operable to calculate the power monitoring value based on the sampled values of the voltage and the current, And a display unit for displaying the image.

If the monitoring condition is set to a start byte and a specific value, the control unit extracts only the frames matching the specific value from the data in the order corresponding to the number set in the start byte in each frame, .

The memory may be provided with a memory for storing an event and a memory for storing a power gauge value.

The communication unit may further include an RS 485 or an Ethernet modem for communicating with the communication network, and a USB port to which the manager device is connected.

And the control unit provides a menu for setting the monitoring condition in response to a user's input.

When the start byte is set to 0, the control unit outputs all data transmitted and received from the corresponding line.

The specific value may be set to a length of 4 bytes or less.

According to the embodiment of the present invention, a function of displaying all communication packets for accessing a digital power device applied to a power system through a display unit is added, It is possible to provide data that enables quick and accurate determination of a problem in the communication of the power device.

1 is a schematic view showing a structure of a conventional power system.
2 is a diagram illustrating the overall structure of a power system including a digital power device according to an embodiment of the present invention.
3 is a diagram illustrating a structure of a digital power device 110 according to an embodiment of the present invention.
4A to 4C are views illustrating display screens of a digital power device according to an embodiment of the present invention.
5 is a flowchart illustrating a method of driving a digital power device according to an embodiment of the present invention.

In this specification, terms including ordinal numbers such as first, second, etc. are used to denote various elements, and the constituent elements are not limited by such terms. The terms described in the following description are used for the purpose of distinguishing one element from another.

In particular, where an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between. On the other hand, if any component is described as having a "direct connection" or "direct connection" to another component, there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

Hereinafter, a structure of a digital power device and a power system including the same according to a preferred embodiment of the present invention will be described with reference to the drawings.

2 is a diagram illustrating the overall structure of a power system including a digital power device according to an embodiment of the present invention.

Referring to FIG. 2, the power system 100 including the digital power device according to the embodiment of the present invention measures, monitors, or controls the power-related operation state of the monitored device, and when the event is generated, A plurality of digital power devices (110) for displaying a communication diagnostic screen corresponding to the monitoring conditions, an upper monitoring device (120) for monitoring the overall operation state of the digital power devices, And a communication relay device 130 that sets a communication method and a protocol of the upper monitoring device 110 and the upper monitoring device 120 and transmits and receives the data information according to the communication method and protocol when one of them requests data information.

The digital power device 110 may be a plurality of digital power devices of the same or different types installed in a power station and a substation based on a predetermined communication standard. The power device 110 measures data such as a state value of a meter, a circuit breaker, a line or a bird, a generator output value, and the like, and measures measured data corresponding to a control signal received from the upper monitoring device 120, Based communication unit.

Particularly, in the embodiment of the present invention, the digital power device 110 can receive not only the data designated to the digital power device 110 but also data for other digital power devices.

In the conventional RS485 communication, in all devices connected to one line, slaves are discarded without storing input data if they do not match their own station numbers or there is no packet matching, , All the data stored in the serial buffer is stored in the internal memory regardless of whether the received data matches the station number or the packet match, and then displayed on the screen according to the monitoring condition.

As shown in FIG. 2, in one of the digital power devices 110a, 110b, and 110c connected to one line, a user may select one of the digital power devices 110a, 110b, (110a, 110c), and the error of the current communication network can be easily determined through the data.

To this end, the control unit 116 provided in the digital power device 110 of the present invention is programmed with a monitoring condition setting function and a communication diagnosis function.

Hereinafter, a specific structure of the digital power device 110 according to an embodiment of the present invention will be described with reference to the drawings.

3 is a diagram illustrating a structure of a digital power device 110 according to an embodiment of the present invention.

3, the digital power device 110 of the present invention includes a power supply unit 111, a current / voltage input unit 112, a DI / DO processing unit 113, a communication unit 114, a memory unit 115, 116, a display unit 117, and a key input unit 118.

Specifically, the power supply unit 111 receives power from an external device, a battery, or the like, converts the power into driving power for the digital power device 110, and supplies the driving power to the inside.

The current / voltage input unit 112 receives the voltage and current of the power system from the monitored device connected to the device, and converts the voltage and current into a small signal. The converted small signal is input to a control unit 116, which will be described later, and converted into a power monitoring value of the monitoring target device through calculation to be provided to the user and the upper monitoring device.

The DI / DO processing unit 113 converts the digital data input from the outside into a form that can be processed by the control unit 116 under the control of the control unit 116 and provides the converted data. The data provided herein may include a control request and a data transmission / reception request of the digital power device 110 from an upper monitoring device.

The communication unit 114 receives data from the upper monitoring apparatus at the remote location through the communication relay apparatus and transmits the response data corresponding to the received data to the upper monitoring apparatus. The communication unit 114 may use an RS485 or Ethernet module for connection to a communication network, and may include a USB port for a manager connection.

The memory unit 115 controls the power monitoring value generated in response to the small signal converted from the current / voltage input unit 112 and various settings required for driving the digital electric power equipment 110 It stores the value. The memory unit 115 may be a nonvolatile memory module. In addition, in the embodiment of the present invention, the memory unit 115 stores all the data received from the communication unit 114 and temporarily stored in the serial buffer, and then the controller 116 reads out the stored data, And provides it to the user through the display unit 117.

The controller 116 controls the overall operation of the digital power device 110. For example, the control unit 116 reads data necessary for driving from the memory unit 115 or stores the received data in the memory unit 115. [ In addition, the power monitoring value and the current state of the digital power device 110 are informed by controlling the respective components constituting the digital power device 110, and displayed through the display unit 117 or transmitted to the upper monitoring device do. The controller 116 may be implemented as a microprocessor (MPU) or a central processing unit (CPU).

Although not shown, an analog-digital converter for processing digital data input from the voltage / current input unit 112 and the DI / DO processing unit 113 may be incorporated in the control unit 116 .

In particular, the control unit 116 according to the embodiment of the present invention is programmed with a monitoring condition setting function and a communication diagnosis function, and the memory unit 115 stores all data. Accordingly, the control unit 116 provides the monitoring condition menu to the user through the display unit, and the user can input the value in the monitoring condition menu to obtain information on the desired communication condition. Here, if the user sets the monitoring condition to a default value or '0', all communication status screens confirmed by the control unit 116 are provided irrespective of whether a specific event has occurred or not. In addition, if the user inputs a start byte and a value for data in the monitoring condition, and an event occurs, the control unit 116 provides a communication status screen read out from the memory unit only to the corresponding data.

Accordingly, the user can confirm the communication state of all the devices connected to the desired current digital power device through the communication status screen.

Hereinafter, a driving method will be described by way of an example of a display screen according to the driving of the digital power device according to the embodiment of the present invention with reference to the drawings.

4A to 4C are views illustrating display screens of a digital power device according to an embodiment of the present invention.

Referring to FIG. 4A, when the communication state is bad or an error occurs in one or more devices connected to the same line as the corresponding device, the digital power device 110 transmits all The communication status is displayed on the display unit.

The display unit displays a data screen W11 showing communication data on the main screen W1 and an icon screen W12 including a monitoring condition setting function, a storage function, a start and stop function, a previous screen return function, and a home function can do. The user can directly confirm the data on the communication state through the data screen W11 and can perform a desired operation by selecting one of the icons provided on the icon screen W12. When the monitoring condition setting is selected by the user, the monitoring condition setting screen W2 illustrated in FIG. 4B is displayed on the main screen W1.

In the monitoring condition setting screen W2, a monitoring condition to be checked by the user can be set. Such a monitoring condition may include the start byte W21 of the data and the data value W22. Therefore, in the embodiment of the present invention, only the frames matching the set data value are read out from the data in the order corresponding to the value set in the start byte in each frame of the communication data received by the digital power device 110, On the screen. Here, the range of the data value can be determined in 4 bytes or less so as not to affect the original function in consideration of the load of the control unit. That is, even if the monitoring condition is continuously set, the original function of the digital power device is normally performed.

On the other hand, even if the screen of the digital power device 110 is turned off for saving power or the screen corresponding to the original function occupies the display unit, if the event occurs according to the monitoring condition, . FIG. 4C illustrates a screen W3 displayed when an event occurs in the embodiment of the present invention. Referring to FIG. 4C, the present invention displays communication data corresponding to a current display content at the time of occurrence of an event.

4C, when an event occurs in accordance with the set monitoring condition, the screen of the digital power device 110 is automatically switched to the communication diagnosis screen W31, and an alarm occurrence indication is output, File. On one side of the communication diagnosis screen W31, there is provided an icon screen W3 for executing a storage function, monitoring or stopping of data monitoring, a previous screen returning function and a home function by the user's selection.

According to this configuration, according to the embodiment of the present invention, the data received in the communication network is displayed on the display part included in each digital power device through the arithmetic processing of the control part, so that the digital power device and the upper communication There is a feature that the communication state with the device can be easily diagnosed. In addition, the stored communication data can be confirmed through a manager program which is separately connected, and it is possible to more easily find the cause of communication failure.

In addition, it is possible to create an environment that allows the user to easily check whether there is an abnormality according to the occurrence frequency of error, not to display all the data received by the digital power device by setting the monitoring condition. In the power system, all the data transmitted and received through the connected communication network can be confirmed by each digital power device, so that a communication error of other devices can be easily detected.

Hereinafter, a digital power device according to an embodiment of the present invention and a method of driving a power system including the same will be described with reference to the drawings.

5 is a flowchart illustrating a method of driving a digital power device according to an embodiment of the present invention.

Referring to FIG. 5, a method of driving a digital power device according to an embodiment of the present invention receives data transmitted from all devices connected to the digital power device through a communication network and stores the received data in a built-in memory (S100 ).

Next, the control unit determines whether the monitoring condition is satisfied, and displays the data stored in the memory unit (S110). If the user intends to check whether or not the other digital devices connected to the current system are operating normally, the user can confirm only the necessary data by setting the identification value of the data, that is, the start byte and the data value, in the monitoring condition.

When the monitoring condition is not set, all the data received by the digital device is stored in the memory unit, and the user can execute the communication diagnostic function to check all the stored data through the display unit (S120).

When the user sets the monitoring condition, the control unit searches the data stored in the memory unit for the data conforming to the set monitoring condition (S130). If data matching the monitoring condition is not found in the current frame, the next frame is searched (S140). If data matching the monitoring condition is found, the data is output in text form through the display unit (S150). The user can confirm the current communication state of the desired digital power device by confirming the contents on the display unit.

The digital power device and the method of driving the power system including the digital power device are repeatedly performed according to a predetermined data transmission / reception period.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

110: Digital power device 111: Power source
112: current / voltage input unit 113: DI / DO processing unit
114: communication unit 115: memory unit
116: control unit 117: display unit
118:

Claims (5)

A communication unit for transmitting and receiving data to and from an external device;
A current / voltage input unit for converting a voltage and a current of the power system into a small signal;
A controller for calculating the power monitoring value corresponding to the small signal of the voltage and the current by calculating the data according to the monitoring condition to generate an event;
A memory unit for storing the event and the power monitoring value;
And a display unit for displaying the event and the power monitoring value,
When the monitoring condition is set to a start byte and a specific value, the control unit extracts only frames matching the specific value from the data in the order corresponding to the number set in the start byte in each frame, Digital power equipment. The method according to claim 1,
Wherein,
And a USB port to which an RS 485, an Ethernet modem or a manager device for communicating with the communication network is connected. The method according to claim 1,
Wherein,
And controls the display unit to display a menu for setting the monitoring condition corresponding to a user's input. The method according to claim 1,
And when the start byte is set to 0, the control unit outputs all data transmitted and received from the corresponding line. The method according to claim 1,
Wherein the specific value is set to a length of 4 bytes or less.
KR1020150099934A 2015-07-14 2015-07-14 Digital power meter and a power system inculding the same KR20170008583A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150099934A KR20170008583A (en) 2015-07-14 2015-07-14 Digital power meter and a power system inculding the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150099934A KR20170008583A (en) 2015-07-14 2015-07-14 Digital power meter and a power system inculding the same

Publications (1)

Publication Number Publication Date
KR20170008583A true KR20170008583A (en) 2017-01-24

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Country Link
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