JP2020162358A - Power monitoring system - Google Patents

Abstract

To provide a power monitoring system capable of estimating operation situations of operating load apparatuses, without providing a measurement device for each of load apparatuses, only by measuring each transformer's power supplied from a high voltage power receiving facility to the respective loads.SOLUTION: A power monitoring system includes: a voltage sensor 4 and a current sensor 5 that acquire information on voltage and current flowing through a transformer of a high voltage power receiving facility; a cloud server 3 for storing load apparatus information including information on working current and a power factor of each load apparatus to which power is supplied from the high voltage power receiving facility; a monitoring device 1 that on the basis of measurement information from the voltage sensor 4 and the current sensor 5 and information from the cloud server 3, estimates operating load apparatuses and estimates power consumption of each of the operating load apparatuses; and a display device 2 for displaying estimation results.SELECTED DRAWING: Figure 1

Description

The present invention relates to a power monitoring system that monitors the power status of a high-voltage power receiving facility installed in a consumer, and more particularly to a power monitoring system that estimates an operating load from power information of a transformer installed in the high-voltage power receiving facility.

Conventionally, there is a power monitoring device that monitors the power usage status of a power facility equipped with a plurality of load devices in order to promote energy saving and to grasp the operating status.
Such a power monitoring device is provided with a measuring device for measuring current and voltage for each load device, for example, for each distribution board or branch circuit, and individually obtains information from them to process data and monitor the power. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-132812

As described above, the conventional power monitoring device requires a large number of measuring devices, and since they are installed in a distributed manner, the installation work is troublesome and a large cost is incurred.
However, in the case of high-voltage power receiving equipment, each load device that supplies power has characteristics in terms of current and power factor characteristics when operating, and if these characteristics are grasped in advance, it is not necessary to measure the current and the like individually. It is also possible to estimate the operating load equipment from the power and power factor supplied from the high-voltage power receiving equipment that is the supply source.
For example, even with the same three-phase load, if it is an electric furnace, an even current flows through the three phases, and the power factor is as high as 0.9 to 1, but if it is a motor load, the operating current is high. It is relatively small and has a low power factor of 0.6 to 0.7. From such characteristics, it is possible to judge even the data of only the power supply source.

Therefore, in view of such a problem, the present invention operates only by measuring the power of each transformer supplied from the high-voltage power receiving equipment to each load without providing a measuring device for each load device. The purpose is to provide a power monitoring system that can estimate the operating status of existing load equipment.

In order to solve the above problems, the power monitoring system according to the invention of claim 1 includes a measuring means for obtaining information on the current and voltage flowing through the transformer of the high-voltage power receiving equipment, and an individual electric power supplied from the high-voltage power receiving equipment. Estimates the operating load equipment based on the load information storage unit that stores the load equipment information including the operating current information and power factor information of the load equipment, and the measurement information of the measuring means and the information of the load information storage unit. At the same time, it is characterized by having a load estimation unit that estimates the power consumption of each operating load device and a display means for displaying the estimation result.
According to this configuration, even if a plurality of load devices are operating at the same time, the power consumption of the load devices and the individual load devices in which the load estimation unit is in the operating state is estimated from the measured current / voltage information. Therefore, the operating status of each load can be grasped without installing a current measuring means and a voltage measuring means for each load device, which can be utilized for promoting energy saving.

The invention of claim 2 is characterized in that, in the configuration according to claim 1, the load estimation unit estimates the operating load based on the average value data for each predetermined time.
According to this configuration, the load estimation unit estimates the operating load based on the average value data for a predetermined time, so that large fluctuations in the current at the start-up of the load device and the involvement of noise can be eliminated, and highly accurate information can be obtained. Can be provided.

In the invention of claim 3, in the configuration according to claim 1 or 2, a monitoring device including a measuring means and a load estimation unit is arranged in the high-voltage power receiving equipment, while a load is applied to a cloud server arranged on the communication network. An information storage unit is arranged to enable communication between the cloud server and the monitoring device, and the display means and the monitoring device are characterized in that communication is performed via a transmission line or a communication network.
According to this configuration, the cloud server on the communication network manages the load information of the high-voltage power receiving equipment, so that the information of the load equipment of multiple consumers can be managed collectively, and each customer can build the system at low cost. it can.

According to the present invention, even if a plurality of load devices are operating at the same time, the load in which the load estimation unit is in operation and the power consumption of each load are used based on the current / voltage information of the transformer installed in the high-voltage power receiving facility. To estimate. Therefore, the operating status of each load can be grasped without installing a current measuring means and a voltage measuring means for each load device, which can be utilized for promoting energy saving.

It is a block diagram which shows an example of the electric power monitoring system which concerns on this invention. It is explanatory drawing which displayed the measurement result of the monitoring device on the display device. It is explanatory drawing which displayed the result of estimating the operation state of a load from the measurement result of FIG. It is explanatory drawing which shows the other display of the display device.

Hereinafter, embodiments that embody the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a power monitoring system according to the present invention, which includes a monitoring device 1, a display device 2, and a cloud server 3.
The monitoring device 1 and the cloud server 3 are connected via a communication network such as an Internet network, and the monitoring device 1 and the display device 2 are connected via a transmission line. The monitoring device 1 and the display device 2 may also be connected via a communication network.

The monitoring device 1 is installed in a high-voltage power receiving facility such as a cubicle, and has a voltage information input unit 11 to which a plurality of voltage sensors 4 can be connected, a current information input unit 12 to which a plurality of current sensors 5 can be connected, and a memory for storing various information. 13. It includes a monitoring device CPU 14 that controls the monitoring device 1, a first communication IF 15 that communicates with the cloud server 3, a second communication IF 16 that communicates with the display device 2, and the like.
The voltage sensor 4 connected to the voltage information input unit 11 and the current sensor 5 connected to the current information input unit 12 are a three-phase transformer or a single-phase transformer that converts high voltage to low voltage in the high-voltage power receiving equipment (either Each voltage / current is measured (not shown), and the data is sent to the monitoring device 1. The voltage sensor 4 includes a simple electric wire connected to the measurement site.

In the monitoring device 1 that receives the measurement data, the monitoring device CPU 14 performs a predetermined calculation and stores the calculation result in the memory 13. Specifically, the average value for each predetermined time (here, every 30 minutes) is calculated from the obtained current data and voltage data, and the electric power is calculated based on this average value and stored in the memory 13. Further, the power factor is also stored in the memory 13 by calculating the average for each predetermined time. The predetermined time for calculating the average value may be 10 minutes or 1 hour.

The display device 2 is installed in a customer's management room or the like, and has a display unit 21, an operation unit 22, a communication IF 23 for communicating with the monitoring device 1, and the like. By operating the operation unit 22, desired information regarding the power consumption can be obtained from the monitoring device 1 and displayed on the display unit 21. Further, by operating the operation unit 22, information on various characteristics such as the operating current (electric power) and power factor of each load device to which the high-voltage power receiving equipment supplies power can be input to the cloud server 3 via the monitoring device 1. It is said.

The cloud server 3 communicates with a plurality of monitoring devices 1 via a communication network. Then, for each monitoring device 1 (for each customer), a load information database 31 that stores information on the operating current (or power) and power factor of each load device to which the high-voltage power receiving equipment supplies power, and a load information database 31 for each load device. It is provided with an operation information database 32 and the like that stores operation mode characteristics such as average time information of operation start / end, current change characteristics after operation, and power factor change characteristics. The operating current may be either the rated current or the actual measured current value during operation, or both data may be stored.

FIG. 2 shows a display example of the display device 2, and shows the transition of the current (electric power) and the power factor measured by the monitoring device 1 of the consumer A. In FIG. 2, the average current and the power factor calculated at predetermined time intervals (here, every 30 minutes) are displayed, and the data stored in the memory 13 is fetched and displayed by the monitoring device CPU 14. To.
Specifically, the measured values of the three-phase transformer installed in the high-voltage power receiving equipment are shown. In the displayed time zone, there is no load because the current is not measured for 30 minutes after the start of measurement, but the current is measured from 30 minutes to 3 hours later. From this, it can be seen that the load device is operating.

However, it is registered in the cloud server 3 as a load device of the consumer A, and in the three-phase transformer by connecting an electric furnace and a motor as load devices. Further, the operating current of the electric furnace is registered at 100 amperes and the power factor is 1.0, and the rating of the motor is registered at 35 amperes and the power factor is −0.6.

Based on this information, the monitoring device CPU 14 has a current of about 100 amperes and a power factor of between 0.9 and 1.0 from 30 minutes to 1 hour, so that the electric furnace is full. Estimated to be in operation.
From 1 hour to 1.5 hours, the current is about 135 amperes and the power factor is between 0.8 and 0.9, so it is estimated that the electric furnace is in full operation + the motor is in operation. Also, from 1.5 hours to 2.5 hours, the current is about 70 amperes and the power factor is between 0.7 and 0.8, so the electric furnace is operating at 35 amperes and the motor is operating. Presumed to be.
Furthermore, since the power factor is between 0.9 and 1.0 at about 35 amperes from 2.5 hours to 3 hours later, it is estimated that the motor is stopped and only the electric furnace is in the driving state.
Then, since the current is not measured after 3 hours, it is estimated that there is no load.

FIG. 3 shows a state in which such an estimation result is displayed on the display unit 21. D1 indicates the operating state of the electric furnace, and D2 indicates the operating state of the motor. As shown in FIG. 3, it is estimated that the electric furnace operated from 30 minutes to 3 hours after the start of measurement, and the motor operated from 1 hour to 2.5 hours.

In this way, even if multiple load devices are operating at the same time, the operating status of multiple loads can be grasped simply by measuring the current / voltage of the transformer installed in the high-voltage power receiving equipment and calculating the power factor. be able to. Therefore, the operating status of each load can be grasped without installing a measuring means such as a current sensor for each load device, which can be utilized for promoting energy saving.
In addition, the monitoring device 1 estimates the operating load based on the average value data for a predetermined time such as 30 minutes, so that large fluctuations in the current at the start-up of the load device and the involvement of noise can be eliminated, and highly accurate information can be obtained. Can be provided.
Further, by managing the load information of the high-voltage power receiving equipment by the cloud server 3 on the communication network, it is possible to collectively manage the information of the load devices of a plurality of consumers, and each customer can construct the system at low cost.

FIG. 4 shows another display of the display device 2, and the customer A connects the power consumption information of the load device to which the single-phase transformer provided in the high-voltage power receiving equipment supplies the power to the three-phase transformer. An example of displaying together with the load equipment is shown, and the power consumption at a specific time is displayed.
Lighting and a large number of personal computers are mainly connected to the single-phase transformer as load devices, and the operating current (electric power) and power factor thereof are registered in the cloud server 3.
As shown in FIG. 4, based on the measured value information of the voltage sensor 4 and the current sensor 5 attached to the single-phase transformer, the monitoring device CPU 14 adds the operation mode feature stored in the operation information database 32 of the cloud server 3. By doing so, the power consumption of the lighting and the personal computer can be estimated.
As described above, the load equipment is not limited to the electric furnace, the motor, and the like, and the operating status in each time zone can be grasped even in the connection load of the single-phase transformer.

If the load devices connected to the same transformer have similar characteristics, in addition to the rated value information and power factor information, the average operating time, current characteristics at startup, etc. of each can be obtained from the cloud server 3. By registering in the operation information database 32 and causing the monitoring device CPU 14 to refer to the registered data and further add time information, current fluctuation information, and the like, it is possible to discriminate and estimate the load device in operation.
Further, in the above embodiment, the load information is stored in the cloud server 3, but the load information / operation information is stored in each monitoring device 1 or for each monitoring device 1 without arranging the cloud server 3. A part may be provided.

1 ... Monitoring device, 2 ... Display device (display means), 3 ... Cloud server, 4 ... Voltage sensor (Measuring means), 5 ... Current sensor (Measuring means), 14 ... Monitoring device CPU (Load) Estimating unit), 21 ... Display unit, 31 ... Load information database (load information storage unit), 32 ... Operation information database.

Claims (3)

Measuring means to obtain information on the current and voltage flowing through the transformer of high-voltage power receiving equipment,
A load information storage unit that stores load device information including operating current information and power factor information of individual load devices to which power is supplied from the high-voltage power receiving facility.
Based on the measurement information of the measuring means and the information of the load information storage unit, the load estimation unit that estimates the operating load equipment and estimates the power consumption of each operating load equipment, and the load estimation unit.
A power monitoring system characterized by having a display means for displaying an estimation result. The power monitoring system according to claim 1, wherein the load estimation unit estimates an operating load based on average value data for each predetermined time. While arranging a monitoring device including the measuring means and the load estimation unit in the high-voltage power receiving equipment,
The load information storage unit is arranged on a cloud server arranged on a communication network to enable communication between the cloud server and the monitoring device.
The power monitoring system according to claim 1 or 2, wherein the display means and the monitoring device communicate with each other via a transmission line or the communication network.

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