JP2007244098A - Power quality monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save labor comparatively easily and to make the storing and analysis of data easy, by making it possible to collect automatically and efficiently by remote control the evaluation index data of power quality of devices to be monitored. <P>SOLUTION: A plurality of measuring terminals are provided with an operation portion that takes in the data of the devices to be monitored and calculates evaluation index of evaluating various electric capacity, a storage portion that stores the evaluation index data, a judgment portion that detects the increase or decrease and the excess of the evaluation index by a threshold value with regard to the evaluation index data and stores an analog momentary value and a digital momentary value in the storage portion, and a transmission portion that transmits the data to a remote data collecting device. This data collecting device is provided with a storage portion that manages the received data from each measuring terminal and stores the data by each measuring terminal, a document data re-editing process portion that takes in data which cannot be taken in by the terminals themselves and re-edits each evaluation index to document formats, a document file making process portion that can take out each evaluation index and waveform data as editable file formats, and a display portion that displays each evaluation index that evaluates various electric quantities stored as the document formats and momentary value waveforms. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention measures the amount of electricity that is constantly updated, such as a substation or a general industrial plant, or operation information (real-time data) of various devices, and calculates an evaluation index for evaluating the power quality of various amounts of electricity. The present invention relates to a power quality monitoring device that transmits data to a remote data collection device via a communication line while storing the data in its own device.

  In recent years, with the spread of distributed power sources using natural energy such as solar power generation and wind power generation, there is a concern about influence on power quality such as voltage fluctuation.

  In heavy industrial areas, for example, voltage fluctuations occur in the electric power system supplied to the iron furnace for arc furnaces. As a result, general consumers are affected by flickering of lighting, TV screen fluctuations, modulation of electronic application equipment, etc. Is exerting.

  2. Description of the Related Art Conventionally, as a power quality monitoring device in a substation or a general industrial plant, one having the following configuration is known.

(1) The management server is connected to the system configuration diagram of each acquired power consumer power distribution facility, information including at least one of the power reception voltage, the power reception facility capacity, and the contract power, a plurality of power reception points, and each load device. Information including at least one of current and voltage in the bus and feeder circuit, information including at least one of load device type, capacity, operating status and presence / absence of abnormal stop or damage information in abnormal Each information is associated using the association information stored in the storage means, the information and the associated information are accumulated in a database, and the electric power consumer is accumulated using the information accumulated in the database. Is calculated by the calculation means of the management server and presented to the power consumer (Patent Document 1)

(2) Distribution substation control system and quality control center that exchanges information with each customer via communication line, monitors power operation data of customers and system status of distribution system online, and as a result, voltage If the management value is deviated, select the corresponding system control device or the distributed power supply of the customer, calculate the control value by coordinating them, and transmit it to the customer and the distribution substation control system What was made (patent document 2).

(3) A power quality calculation means for calculating the degree of power quality of each amount of power acquired from the power system to be evaluated for power quality, and a power quality value from the power quality value obtained by the power quality calculation means. A probability density function creating means for creating a probability density function, a judgment value setting means for setting a judgment value serving as a reference for judging the degree of power quality, a probability density function of the power quality value and a judgment value set. And a power quality evaluation unit that evaluates the degree of power quality to configure a power quality evaluation system (Patent Document 3).
JP 2002-247780 A JP 2004-274812 A JP 2005-073346 A

  The power quality management device according to (1) above stores the database storage information such as the characteristics and status of power receiving and distribution equipment and the current and voltage of the power receiving point, the characteristics and operating status of the load equipment, and the failure information at the time of abnormality. In addition, the power quality management device according to (2) above monitors the influence of the operation of the distributed power source on the system side, and controls multiple distributed power sources in a coordinated manner. Further, the power quality management apparatus according to (3) obtains each degree of distribution by a probability density function for the degree of power quality calculated using each amount of power obtained from the power system to be evaluated, The degree of power quality is evaluated in relation to a determination value for determining the degree.

  However, with these power quality monitoring devices, even though real-time data power quality monitoring can be realized, the operator must perform data measurement and data collection operations in an unfavorable environment such as a substation or plant. In addition, for each power quality evaluation index data, the data plotted on the roll paper output from the power quality monitoring device is visually read and transferred to a spreadsheet file. Since it is impossible to compare and analyze a plurality of data from the power quality monitoring devices distributed and distributed individually, it takes a lot of time and effort.

  In addition, when a problem occurs in the power quality monitoring apparatus, the collected data may be lost.

  The present invention has been made in view of the above circumstances, and by automatically and efficiently collecting evaluation index information of a wide range of power quality to be measured by remote operation, labor saving is relatively simple and data can be saved. An object of the present invention is to provide a power quality monitoring device that can be easily stored and analyzed.

  In order to achieve the above object, the present invention constitutes a power quality monitoring apparatus by the following means.

  The present invention measures the amount of electricity that is constantly updated, such as a substation or general industrial plant, or operation information (real-time data) of various devices, and evaluates the power quality of various amounts of electricity. In a power quality monitoring device that transmits data to a remote data collection device via a communication line from a plurality of measurement terminals that store the data, and monitors the power quality collectively by the data collection device, Each measuring terminal stores an input means for capturing information to be monitored, a calculation means for calculating an evaluation index for evaluating various amounts of electricity from the data acquired by the input means, and evaluation index data calculated by the calculation means And an instantaneous value of analog by detecting increase / decrease or excess of the evaluation index by a preset threshold with respect to the evaluation index data calculated by the calculation means, A determination unit that stores the digital instantaneous value in the storage unit; and a transmission unit that transmits the data stored in the storage unit to the data collection device, wherein the data collection device is transmitted by the transmission unit of each measurement terminal. A reception processing unit that receives the transmitted data and manages the reception data for each measurement terminal, a storage unit that stores the reception data managed by the reception processing unit for each measurement terminal, and is stored in the storage unit Capacity management means for managing the storage capacity of the data to be stored, and when the free area of the storage capacity falls below the lower limit setting value by the management function, the capacity management means for deleting from the past data and keeping the free space of the storage capacity at a predetermined value Information that cannot be imported in the device itself is imported in the form of a file that can be edited separately by spreadsheet software, and each evaluation index is re-edited into a form format using the spreadsheet software function, and the above-mentioned information is recorded. A form data re-editing processing means for re-saving in the means, a form file creation processing means capable of taking out each evaluation index and waveform data saved in the storage means as a file format editable by spreadsheet software, And an evaluation index for evaluating various electric quantities for each of the plurality of measurement terminals stored in the storage means, and a display means for displaying each evaluation index as a form and an instantaneous value waveform by a spreadsheet software function.

  According to the present invention, it is possible to automatically and efficiently collect evaluation index information of a wide range of power quality of a measurement target by remote operation, and power that can be easily saved and analyzed with relatively simple labor saving. A quality monitoring device can be provided.

  FIG. 1 is a block diagram showing a first embodiment of a power quality monitoring apparatus according to the present invention.

  In FIG. 1, MT1, MT2,... MTn are a plurality of dispersed measurement terminal units, and each of these measurement terminal units MT1, MT2,... MTn is an amount of electricity from a monitoring target such as an electric power system or a factory facility and various devices. It takes operation information and processes it into data necessary for power quality management. Electric quantity input processing unit 1, arithmetic processing unit 2, storage processing unit 3, determination unit 4, transmission processing unit 5, and Web server implementation Part 13 is provided. Here, the measurement terminal unit MT1 will be described as a representative.

  Further, AS is a management server unit that collects and collectively manages various data transmitted from each measurement terminal unit MT1, MT2,... MTn via the communication processing unit 6, and this management server unit AS is a reception processing unit 7, A storage processing unit 8, a capacity management unit 9, a form data re-editing processing unit 10, a form file creation processing unit 11, a display processing unit 12, and a Web server / server scripting processing mounting unit 14 are provided.

  In the measurement terminal unit MT1, the electrical quantity input processing unit 1 takes in at least one of the analog-modulated current or voltage from the transformer, the digital contact input device, the sensor or the transducer as the information to be monitored. / Digital conversion is performed, and a digital signal is generated so that various arithmetic processes can be performed by a digital circuit or software.

  The arithmetic processing unit 2 uses electric power of various electric quantities such as harmonics, voltage distortion rate, active / reactive power, and flicker evaluation indexes ΔV10, Pst, ΔV, etc., from the digital signal fetched from the electric quantity input processing unit 1. An evaluation index for evaluating quality is calculated.

  The storage processing unit 3 uses at least one of a semiconductor memory and a magnetic storage device, and stores evaluation index data calculated by the calculation processing unit 2.

  The determination unit 4 sets a threshold value for the evaluation index data calculated by the calculation processing unit 2 to detect increase / decrease / excess of the evaluation index, freezes the analog instantaneous value and the digital instantaneous value at that time for a predetermined time, and then performs storage processing. Part 3 is stored.

  The transmission processing unit 5 uses at least one of a serial communication port, an Ethernet (registered trademark), a communication port, and a wireless communication port, and transmits data stored in the storage processing unit 3 to a remote data collection device. .

  The communication processing unit 6 uses at least one of an optical line, an electrical metal line, and a wireless line, and transmits data sent from the transmission processing unit 5.

  Further, in the management server unit AS, the reception processing unit 7 receives data transmitted via the communication processing unit 6 and manages the received data for each of the plurality of measurement terminals.

  The storage processing unit 8 stores data for each of the plurality of measurement terminals received by the reception processing unit 7.

  When the free area of the data storage capacity falls below the lower limit setting value for the data stored in the storage processing unit 8, the capacity management unit 9 deletes the data from the past stored data and sets the free area of the storage capacity to a predetermined value. It is for keeping it in a safe place.

  The form data re-editing processing unit 10 is a file format that allows the user to edit information on the operation results of the arc furnace of the customer that cannot be captured in real time from the data stored in the storage processing unit 8 with spreadsheet software ( CSV format), each evaluation index is re-edited into a form format using a spreadsheet software function, and re-saved in the storage processing unit 8.

  The form file creation processing unit 11 can extract each evaluation index and waveform data stored in the storage processing unit 8 as a file format (CSV format or XLS format) that can be edited by spreadsheet software.

  The display processing unit 12 displays an evaluation index for evaluating various electric quantities, a form for each evaluation index, and an instantaneous value waveform for each of a plurality of measurement terminals stored in the storage processing unit 8.

  Here, the Web server mounting unit 13 on the measurement terminal unit MT1 side is mounted with a Web server that supports HTTP, which is a standard protocol of the Internet, and uses a Web browser that supports HTTP from a remote location via a communication line. Remote maintenance function.

  In addition, the management server unit AS-side Web server / server scripting processing implementation unit 14 can operate the power quality evaluation index, instantaneous value waveform, and form file browsing / retrieval from a plurality of client terminals connected via communication lines. As described above, a web server that supports HTTP, which is a standard protocol of the Internet, and a server side that performs dynamic arithmetic processing and response on the server side in response to a request from at least one client among CGI, ASP, servlet, JSP, and PHP. Scripting processing function is provided.

  Next, the operation of the power quality monitoring apparatus configured as described above will be described.

  Now, in the measurement terminal unit MT1, when measurement information such as an analog-modulated current or voltage from a transformer, a digital contact input device, a sensor or a transducer is taken into the electric quantity input processing unit 1 as information to be monitored, These pieces of measurement information are converted from analog signals to digital signals and input to the arithmetic processing unit 2.

  In this arithmetic processing unit 2, electric power of various electric quantities such as harmonics, voltage distortion rate, effective / reactive power, flicker evaluation indexes ΔV 10, Pst, ΔV, etc. from the digital signal taken in from the electric quantity input processing unit 1. An evaluation index for evaluating quality is calculated, and the evaluation index data is stored in the storage processing unit 3 and input to the determination unit 4.

  The determination unit 4 sets a threshold for the evaluation index data calculated by the calculation processing unit 2 to detect increase / decrease / excess of the evaluation index, freezes the analog instantaneous value and digital instantaneous value at that time for a predetermined time, and stores the processing unit Save to 3.

  Data stored in the storage processing unit 3 is transmitted from the transmission processing unit 4 to a management server installed as a remote data collection device using at least one of a serial communication port, an Ethernet (R) communication port, and a wireless communication port. The data is transmitted to the AS via the communication processing unit 6.

  In the management server AS, the data transmitted via the communication processing unit 6 is received by the reception processing unit 7, the received data is managed for each of the plurality of measurement terminal units, and each measurement is performed in the storage processing unit 8. Each data is stored in an area corresponding to the terminal unit.

  In this case, the capacity management unit 9 determines whether or not the free area of the data storage capacity of the storage processing unit 8 is below the lower limit setting value for the data stored in the storage processing unit 8, and if it is below The data is deleted from the past stored data, and the free space of the storage capacity is kept at a predetermined value.

  The data stored in the storage processing unit 8 is a file that can be edited separately with spreadsheet software such as information on the operation results of the arc furnace of a customer who cannot be taken into the form data re-editing processing unit 10 in real time in the device itself. In the form (CSV format), each evaluation index is re-edited into a form format using a spreadsheet software function and re-saved in the storage processing unit 8.

  In this way, each evaluation index and waveform data stored in the storage processing unit 8 is taken into the form file creation processing unit 11 and taken out as a file format (CSV format or XLS format) that can be edited by spreadsheet software. Processed as possible.

  Then, an evaluation index for evaluating various electric quantities for each measurement terminal unit stored in the storage processing unit 8, a form and an instantaneous value waveform for each evaluation index are displayed on the display processing unit 12.

  On the other hand, by installing a Web server compatible with HTTP, which is a standard Internet protocol, on the Web server mounting unit 13 on the measurement terminal unit MT1 side, and using a Web browser compatible with HTTP from a remote location, it can be remotely connected via a communication line. Maintenance can be performed.

  In addition, the Web server / server scripting processing implementation unit 14 on the management server unit AS side performs server-side scripting processing, so that the power quality evaluation index, instantaneous value waveform, and form file viewing / retrieving are connected via a communication line. It can be operated from a plurality of client terminals, and is operated on the server side in response to a request from at least one client among a Web server compatible with the standard Internet protocol HTTP and CGI, ASP, servlet, JSP, PHP. Arithmetic processing and response can be performed.

  As described above, according to the first embodiment of the present invention, the data that has been plotted on the conventional roll paper or the like can be visually confirmed, and the work that has been separately transferred to the form format can be omitted, so that the work efficiency can be improved. In addition, a plurality of monitoring target data can be collectively managed at one central location. As a result, it is possible to manage the states of a plurality of management targets by remote operation without periodically patroling manually and collecting the management target data.

  Further, even when the data amount of the measurement data and the calculation data of the evaluation index is large, it is possible to avoid that important data cannot be recorded due to insufficient storage capacity.

  Furthermore, maintenance of the measurement terminal portion can be performed remotely while in the management location, and maintenance, information browsing, and file retrieval can be performed from other client PCs connected via a LAN or WAN.

  The information collection / management of the measurement target is exemplified by power quality management of a substation or an industrial plant, but is not limited to information collection / management in the electric power field and the general industrial field.

  FIG. 2 is a block diagram showing a second embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the second embodiment, as shown in FIG. 2, a plurality of measurement terminal units MT1 to MTn (here, MT1 is shown representatively) takes in the bus voltage and the currents from the plurality of power transmission lines and applies the corresponding individual transmissions. A voltage fluctuation synthesizer 15 for converting electric wire current fluctuations into voltage fluctuations is added, and an electric quantity input for capturing information on a monitoring target of voltage fluctuation quantities caused by individual transmission lines converted by the voltage fluctuation synthesizer 15 This is given to the processing unit 1.

  With such a configuration, in addition to the operational effects of the first embodiment, even in a system in which a plurality of consumers (loads) are connected, the degree of influence on the power quality is given to individual consumers. Can be evaluated.

  FIG. 3 is a block diagram showing a third embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the third embodiment, as shown in FIG. 3, a feedback processing unit 16 is added to the transmission processing unit 5 of a plurality of measurement terminal units MT1 to MTn (here, MT1 is representatively shown). Further, the evaluation index data calculated by the calculation processing unit 2 is fed back to the power control device 17 such as a remote SVC so that it can be used as control information for power control.

  With such a configuration, in addition to the operational effects of the first embodiment, it becomes possible to control the static reactive power compensator and the like in real time, thereby improving the power quality.

  FIG. 4 is a block diagram showing a fourth embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the fourth embodiment, as shown in FIG. 4, an arithmetic processing unit sent from the transmission processing unit 5 of the measurement terminal units MT <b> 1 to MTn (represented here as MT <b> 1) via the communication processing unit 6. The evaluation index data calculated in 2 is taken into the remote arbitrary waveform generator 18 and amplified by the amplifier 19 or the like, and then the lighting circuit is energized by the signal to light the incandescent lamp or fluorescent lamp 20 It is.

  With such a configuration, in addition to the effects of the first embodiment, it is possible to evaluate various human sensations by extending the use of various phenomena related to power quality visually. Become.

  FIG. 5 is a block diagram showing a fifth embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the fifth embodiment, as shown in FIG. 5, with respect to the threshold value detected by the determination unit 4 with respect to the evaluation index data calculated by the calculation processing unit 2 of the measurement terminal units MT1 to MTn (here, MT1 is representatively shown). The increase / decrease / excess information of the evaluation index is given to the mail transmission processing unit 21, and the mail transmission processing unit 21 transmits the alarm mail to the personal computer or the portable terminal 22 by the mail protocol on the Internet.

  With such a configuration, in addition to the operational effects of the first embodiment, events that should be managed and controlled as power quality can be notified and recognized in a timely manner regardless of where the manager / operator is located. it can.

  FIG. 6 is a block diagram showing a sixth embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the sixth embodiment, as shown in FIG. 6, each evaluation index calculated by the calculation processing unit 2 of the measurement terminals MT1 to MTn (here, MT1 is representative) is displayed on the display processing unit 12 of the management server unit AS. It has a function for displaying numerical values in real time.

  With such a configuration, in addition to the operational effects of the first embodiment, the numerical data of each evaluation index can be grasped in real time and quantitatively.

  FIG. 7 is a block diagram showing a seventh embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the seventh embodiment, as shown in FIG. 7, each evaluation index calculated by the calculation processing unit 2 of the measurement terminals MT1 to MTn (here, MT1 is representatively represented) is displayed on the display processing unit 12 of the management server unit AS. It has a function to display in real time as a numerical value in graph format.

  With such a configuration, in addition to the effects of the first embodiment, the trend data of each evaluation index can be grasped in real time and quantitatively.

  FIG. 8 is a block diagram showing an eighth embodiment of the power quality monitoring apparatus according to the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and the description thereof is omitted, and different parts will be described here.

  In the eighth embodiment, as shown in FIG. 8, the storage processing unit 8 for storing the received data of the management server unit AS and the display processing unit 12 for displaying the evaluation index are provided with a search function for designating the date and time. The index and waveform data can be output.

  With such a configuration, in addition to the operational effects of the first embodiment, it is possible to easily search for an evaluation index and waveform data that should be noted after the fact.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows 1st Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 2nd Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 3rd Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 4th Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 5th Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 6th Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 7th Embodiment of the power quality monitoring apparatus by this invention. The block diagram which shows 8th Embodiment of the power quality monitoring apparatus by this invention.

Explanation of symbols

  MT1 to MTn ... measurement terminal unit, AS ... management server unit, 1 ... electric quantity input processing unit, 2 ... arithmetic processing unit, 3 ... storage processing unit, 4 ... determination unit, 5 ... transmission processing unit, 6 ... communication processing unit , 7 ... Reception processing unit, 8 ... Storage processing unit, 9 ... Capacity management unit, 10 ... Form data re-editing processing unit, 11 ... Form file creation processing unit, 12 ... Display processing unit, 13 ... Web server mounting unit, 14 ... Web server / server scripting processing implementation unit, 15 ... Voltage fluctuation synthesis unit, 16 ... Feedback processing unit, 17 ... Power control device, 18 ... Arbitrary waveform generator, 19 ... Amplifier, 20 ... Incandescent lamp or fluorescent lamp, 21 ... Mail transmission processing unit, 22 ... PC or portable terminal

Claims (9)

Measure the amount of electricity that is constantly updated, such as a substation or general industrial plant, or the operation information (real-time data) of various devices, calculate the evaluation index to evaluate the power quality of various amounts of electricity, In a power quality monitoring device that transmits data to a remote data collection device via a communication line from a plurality of measurement terminals that store the data, and monitors the power quality collectively by the data collection device,
Each measurement terminal includes an input unit that captures information to be monitored, a calculation unit that calculates an evaluation index that evaluates various amounts of electricity from data captured by the input unit, and evaluation index data that is calculated by the calculation unit. A storage unit for storing, a determination unit for detecting increase / decrease or excess of the evaluation index by a preset threshold with respect to the evaluation index data calculated by the calculation unit, and storing an analog instantaneous value and a digital instantaneous value in the storage unit; Transmission means for transmitting the data stored in the storage means to the data collection device,
The data collection device receives the data transmitted by the transmission unit of each measurement terminal and measures reception data managed by the reception processing unit, and reception processing unit that manages the reception data for each measurement terminal. A storage unit for each terminal and a function for managing the storage capacity of data stored in the storage unit. When the free space of the storage capacity falls below the lower limit setting value by the management function, the storage unit deletes the past data. The capacity management means that keeps the free space of the storage capacity at a predetermined value, and information that cannot be captured in the device itself is captured in a file format that can be edited separately with spreadsheet software, and each evaluation index is a form using the spreadsheet software function The form data re-editing processing means re-edited into the format and re-saved in the storage means, and each evaluation index and waveform data saved in the storage means can be edited with spreadsheet software Form file creation processing means that can be taken out as a file format, evaluation indexes for evaluating various amounts of electricity for each of a plurality of measuring terminals stored in the storage means, and each evaluation index for a form and an instantaneous value by a spreadsheet software function A power quality monitoring apparatus comprising: display means for displaying as a waveform. The power quality monitoring device according to claim 1,
A web server compatible with HTTP, which is an Internet standard protocol, is installed on the measurement terminal side, and a remote maintenance function is provided to the data collection device via the communication line using a Web browser compatible with HTTP,
A web server compatible with HTTP, which is a standard protocol of the Internet, so that the management server can operate the power quality evaluation index, instantaneous value waveform, and form file browsing / retrieving from a plurality of client terminals connected via the communication line. And a power quality monitoring device that implements server-side scripting processing. In the power quality monitoring apparatus according to claim 1 or 2,
A voltage fluctuation synthesizer that takes the bus voltage and current from a plurality of transmission lines into each measurement terminal and converts the fluctuations of the corresponding individual transmission line currents into voltage fluctuations is added. A power quality monitoring apparatus characterized in that a voltage fluctuation amount caused by each of the transmission lines is provided to the electric quantity input processing unit. In the power quality monitoring apparatus according to claim 1 or 2,
Feedback processing means is added to the transmission means of each measurement terminal, and the evaluation index data calculated by the calculation processing means is fed back from the feedback processing means to a power control device such as a remote SVC, thereby providing control information for power control. Power quality monitoring device characterized by being utilized as In the power quality monitoring apparatus according to claim 1 or 2,
The evaluation index data calculated by the calculation means transmitted from the transmission means of each measurement terminal via the communication circuit is taken into a remote arbitrary waveform generator, amplified by an amplifier or the like, and then lit by the signal A power quality monitoring device characterized in that an incandescent lamp or a fluorescent lamp is turned on by energizing a circuit. In the power quality monitoring apparatus according to claim 1 or 2,
With respect to the evaluation index data calculated by the calculation means of each measuring terminal, the increase / decrease / excess information of the evaluation index with respect to the threshold detected by the determination means is given to the mail transmission means provided in the transmission means, and the mail transmission means A power quality monitoring apparatus, wherein an alarm mail is transmitted to a personal computer or a portable terminal through a communication circuit by a mail protocol on the Internet. In the power quality monitoring apparatus according to claim 1 or 2,
The power quality monitoring apparatus, wherein the display means of the data collection apparatus has a function of displaying each evaluation index calculated by the calculation means of each measurement terminal as a numerical value in real time. In the power quality monitoring apparatus according to claim 1 or 2,
The power quality monitoring apparatus, wherein the display means of the data collection device has a function of displaying each evaluation index calculated by the calculation means of each measurement terminal as a numerical value in a graph format in real time. In the power quality monitoring apparatus according to claim 1 or 2,
A power quality monitoring apparatus, wherein the storage means and the display means of the data collection device each have a search function for designating a date and time so that each evaluation index and waveform data can be output.

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