JPH11252727A - Monitor for distribution facility and remote monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To proactively prevent big accidents such as an explosions, fires, etc., and a fault of a power apparatus caused by higher harmonics by monitoring higher harmonics at all times. SOLUTION: This monitor is provided with a higher harmonics computing unit 13 which computes respective higher harmonics in the basis of voltage values and current values in distribution facilities stored in a measured data stored in a measured data storage unit 12, a discriminating unit 15 which discriminates whether the higher harmonic waves are generated on a more upstream side or downstream side than a measuring point, where a voltage measuring means and a current measuring means are set, in the basis of the higher harmonics computed by this higher harmonic computing unit 13, and an output unit 16 which outputs a discriminated result of this discriminating unit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring apparatus and a remote monitoring system for power distribution equipment such as power receiving equipment, substation equipment, and power distribution equipment.

[0002]

2. Description of the Related Art In a power facility such as a building or a factory that consumes a large amount of electric power, 6600 V or 22
2. Description of the Related Art Power receiving / distributing equipment is provided for transforming electric power transmitted at a high voltage such as 000 V to 105 V or 210 V with a transformer and supplying the electric power to buildings and factories.

[0003] The power receiving and transforming equipment is a device which can be called the heart of the power equipment.
A protective device for protecting the power receiving / distributing power distribution equipment is conventionally provided because it affects the facilities of the entire building or factory.

[0004] This protection device shuts off the power supply when the current or voltage, the ground fault current, the ground fault voltage, or the like supplied to the power equipment including the power receiving and transforming equipment exceeds a certain value set as a safety standard. It has become. That is, the supply of power to the electric power facilities is stopped thereafter.

[0005]

As described above, in the conventional protection device, the power supply is cut off after an abnormality occurs.
Until the power is turned off, there is a problem that the field worker and the maintenance manager do not notice the occurrence of the abnormality. In addition, since the power supply is cut off, there is a problem that power cannot be supplied to the power equipment thereafter.

[0006] In the power receiving and distributing facilities handling such a high voltage or the like, the presence of harmonics may cause a failure of the power facilities or, in some cases, lead to a major accident such as explosion or fire. Therefore, in buildings and factories that consume large amounts of power, it is necessary to constantly monitor and reduce harmonics. Conventionally, a device for measuring harmonics has been provided, but whether the harmonic is generated at a power facility or the like downstream of the measurement point or at a power facility or the like upstream of the measurement point. There is no device or system that constantly monitors and determines the situation.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem. It is an object of the present invention to be able to detect an abnormality at a stage before an abnormality such as shutting off a power supply, and to detect harmonics. It is an object of the present invention to provide a monitoring device and a remote monitoring system for power distribution and distribution equipment capable of preventing a failure of power equipment caused by harmonics, an explosion, a fire, and other major accidents by performing monitoring as needed. .

[0008]

According to a first aspect of the present invention, there is provided a monitoring apparatus for a distribution and distribution facility, comprising: a voltage measuring unit and a current measuring unit provided in the distribution and distribution unit; An output for outputting each data of the voltage value measured by the voltage measuring means and the voltage harmonic calculated from the voltage value, the current value measured by the current measuring means and the current harmonic calculated from the current value Means.

According to a second aspect of the present invention, there is provided the monitoring apparatus for power distribution and distribution equipment according to the first aspect, wherein the harmonics are based on the harmonics, and the harmonics are measured by the voltage measuring means and the current measuring means. Is provided on the upstream side of the installed measurement point or on the downstream side, and an output unit that outputs a result of the determination by the determination unit. .

According to a third aspect of the present invention, there is provided a remote control system for power receiving and distributing equipment, wherein the monitoring device according to any one of the first and second aspects is connected to a remote operation device via a communication line. The output means of the monitoring device is constituted by transmitting means for outputting data to the remote control device through the communication line.

According to a fourth aspect of the present invention, there is provided a remote monitoring system for power receiving and distributing equipment, wherein the monitoring device and the remote operation device according to the first aspect are connected via a communication line. However, the remote control device is configured to transmit data to the remote control device through the communication line, and the remote control device is configured to transmit the harmonic to the voltage measuring device based on each harmonic transmitted from the monitoring device. And a determination unit that determines whether the current measurement unit is generated on the upstream side or a downstream side of the measurement point where the current measurement unit is installed, and an output unit that outputs a determination result by the determination unit. A configuration is provided.

According to a fifth aspect of the present invention, there is provided a remote monitoring system for power distribution equipment, wherein a monitoring device and a remote control device are connected via a communication line, and the monitoring device is provided in the power reception and distribution equipment. A voltage measuring unit and a current measuring unit, and a transmitting unit that outputs each data of the voltage value and the current value measured by the voltage measuring unit and the current measuring unit through the communication line, and the remote control device includes: Harmonic calculation means for calculating data related to each harmonic based on each data transmitted from the monitoring device,
Based on the harmonic calculated by the harmonic calculating means, whether the harmonic is generated upstream from the measuring point where the voltage measuring means and the current measuring means are installed,
A configuration is provided that includes a determination unit that determines whether the error has occurred on the downstream side, and an output unit that outputs the determination result of the determination unit.

It is to be noted that the discriminating means according to claim 2, 4, or 5 is arranged such that, when the absolute value of the value obtained by subtracting the current phase from the voltage phase is not less than 90 ° and not more than 270 °, It is determined that a harmonic is generated further downstream, and if the absolute value of the value obtained by subtracting the current phase from the voltage phase is less than 90 ° or greater than 270 °, a harmonic is generated upstream from the measurement point. Is determined.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an electrical configuration of a monitoring apparatus for power distribution and distribution equipment according to the present invention, and corresponds to claims 1 and 2.

That is, a power transmitted from a substation or the like at a high voltage of 105 V
Power receiving and distribution equipment (power receiving equipment, substation equipment,
Power distribution equipment, etc.) 1
Is connected to a panel box 2 containing measuring instruments for measuring voltage, current, ground fault voltage, ground fault current, power, and the like. The panel box 2 is provided with a maintenance personal computer (hereinafter referred to as a maintenance personal computer).
3 is connected.

The panel box 2 includes a voltage measuring device for measuring the voltage of the power receiving / distributing facility 1 and the power equipment connected thereto, a current measuring device for measuring the current, and a ground fault voltage measuring for measuring the ground fault voltage. Earth fault current measuring instrument to measure earth fault current,
And a power meter for measuring the power consumption of each power facility in the facility, and each measurement data is numerically displayed on the front surface of the panel. These measurement data are stored in the internal memory of the maintenance personal computer 3, and can be displayed on the personal computer screen as needed.

FIG. 2 is a block diagram showing a part of the internal configuration of the maintenance personal computer 3. That is, the control unit 11 that controls the maintenance personal computer 3 and various measurement data (voltage, current, ground fault voltage, ground fault current, power amount, etc.) input from various measuring instruments housed in the panel box 2 are transmitted. A measurement data storage unit 12 for storing, a harmonic calculation unit 13 for calculating data relating to each harmonic based on the voltage data and the current data stored in the measurement data storage unit 12,
A harmonic data storage unit for storing data relating to the voltage harmonic and the current harmonic calculated by the harmonic calculation unit; and a voltage and current harmonic data stored in the harmonic data storage unit based on the harmonic data. A determination unit 15 for determining whether a harmonic is generated upstream or downstream of a measurement point where a voltage measurement device and a current measurement device are installed, and a determination result by the determination unit 15 And an output unit 16 for outputting the same. The output unit 16 includes, for example, a display screen such as a CRT for displaying the determination result, a printer 8 (see FIG. 1) for printing out the determination result, and an alarm device such as a buzzer or a lamp for notifying the occurrence of harmonics. ing.

Next, the process of determining harmonics in the maintenance personal computer 3 having the above configuration will be described.

At present, 60 Hz power is supplied to each home and the like in western Japan, but in reality noise and distortion are mixed in from factories and the like that consume large power. That is, 6
A frequency component (harmonic) other than the fundamental frequency component of 0 Hz is included. For this 60 Hz fundamental wave, 120H
z is the second harmonic, 180 Hz is the third harmonic, ...,
(60 × n) Hz is called the nth harmonic.

The harmonic calculator 13 calculates data on harmonics, which are noise and distortion components, based on the voltage and current stored in the measurement data storage 12. In the present embodiment, a fast Fourier transform (FFT) is used as a method of analyzing a harmonic component in order to calculate data on a harmonic. However, the method of analyzing the harmonic component is not limited to the fast Fourier transform, but may be another analysis method.

The harmonic calculator 13 performs the above-described calculation processing to determine the amplitude and phase of each harmonic, and stores these data in the harmonic data storage 14.

FIG. 3 shows the high-frequency calculator 13
5 shows an example of the data of the amplitude and the phase of each harmonic calculated in and stored in the harmonic data storage unit 14. That is, the fundamental wave, the second harmonic, the third harmonic,.
The voltage amplitude (%), voltage phase (°), current amplitude (%), and current phase (°) are stored as data for each of the seventh harmonics.

The discriminator 15 stores the harmonic data storage 1
4. Based on the data stored in step 4, each harmonic is generated upstream of the measurement point where the voltage measurement device and the current measurement device are installed (that is, harmonics are generated in the power equipment or the like upstream of the measurement point). ) Or is generated on the downstream side (that is, harmonics are generated on the power equipment or the like downstream of the measurement point). That is, the voltage phase and the current phase are applied to the condition of the following expression. When the condition of the expression (1) is applied, it is determined that the harmonic is generated in the power equipment or the like downstream of the measurement point, and (2) When the condition of the formula is satisfied, it is determined that the harmonic is generated in the power equipment or the like upstream of the measurement point.

[0025]

90 ° ≦ | voltage phase−current phase | ≦ 270 ° (1)

[0026]

0 ° <| voltage phase−current phase | <90 ° or (2) 270 ° <| voltage phase−current phase | <360 ° That is, the absolute value of the value obtained by subtracting the current phase from the voltage phase When the value is 90 ° or more and 270 ° or less (in the case of equation (1))
If the absolute value of the value obtained by subtracting the current phase from the voltage phase is determined to be less than 90 ° or greater than 270 ° when it is determined that harmonics have occurred in the power equipment downstream of the measurement point (Equation (2)) In the case of), it is determined that a harmonic is generated in the power equipment or the power line on the upstream side of the measurement point.

Therefore, when the data of each harmonic shown in FIG. 3 is applied to the equations (1) and (2), the second harmonic is | 167.1-0.0 | = 167.1. ,
Since the condition of the equation (1) is satisfied, the harmonic is generated in a power facility or the like downstream of the measurement point. Further, the third harmonic is | -152.3-101.1 | = 253.4, which satisfies the condition of the expression (1). Therefore, the harmonic generated in the power equipment or the like downstream of the measurement point is used. It is. Also,
The fourth harmonic is | 13.9−0.0 | = 13.9, which satisfies the condition of the expression (2), and is a harmonic generated in the power equipment or the like on the upstream side. The fifth harmonic is | 152.0 − (− 128.4) | = 280.4, which satisfies the condition of the expression (2). Therefore, the fifth harmonic is generated by the power equipment or the like on the upstream side. is there. Hereinafter, it is similarly determined to be the sixth order and the seventh order.

The discriminating section 15 outputs to the output section 16 the discrimination result of the location where each harmonic is generated in this way. The output unit 16 displays this determination result on a display screen of a CRT or the like, prints out the data from the printer 8, sounds a buzzer, and blinks a lamp (lights up) to notify a maintenance manager. The determination result may be stored in, for example, a predetermined area in the harmonic data storage unit 14 and may be appropriately extracted from the output unit 16 by an operation of a maintenance manager.

Although not shown in FIG. 2, the maintenance personal computer 3 uses the data, such as voltage, current, ground fault voltage, and ground fault current, stored in the
Abnormalities of the supply voltage and the ground fault voltage, and abnormalities of the supply current and the ground fault current are detected from the respective voltage waveforms and current waveforms. However, since these monitoring is performed conventionally, detailed description is omitted here.

FIG. 4 is a schematic diagram showing the overall configuration of a remote monitoring system for power receiving and distribution equipment according to the present invention, and corresponds to claims 3 to 5.

That is, power transmitted from a substation or the like at a high voltage is supplied to a power facility such as a building or a factory by 105 V.
Power supply and distribution equipment 1 is installed to transform the power to 210V and supply it to each power facility in a building or factory. Current,
A panel box 2 containing measuring instruments for measuring electric power and the like is connected. Also, panel box 2
Is connected to a maintenance personal computer 3. The maintenance personal computer 3 is installed in, for example, a maintenance management center via a modem 4, a general public line (or a dedicated communication line) 5, and a counterpart modem 6. And a personal computer for management (hereinafter, referred to as a management personal computer) 7 which is a remote monitoring device.

The panel box 2 includes a voltage measuring device for measuring the voltage of the power receiving / distributing facility 1 and the power facilities connected thereto, a current measuring device for measuring the current, and a ground fault voltage for measuring the ground fault voltage. Earth fault current measuring instrument to measure earth fault current,
And a power meter for measuring the power consumption of each power facility in the facility, and each measurement data is numerically displayed on the front surface of the panel. These measurement data are stored in the internal memory of the maintenance personal computer 3, and can be displayed on the personal computer screen as needed. Further, these measurement data are transmitted to the management personal computer 7 through the general public line 5 at any time or at a fixed time interval, and are stored in the internal memory of the management personal computer 7.

FIG. 5 is a block diagram showing a part of the internal configuration of the management personal computer 7, and corresponds to claim 4.

That is, the control unit 21 for controlling the management personal computer 7 and various measurement data (voltage, voltage harmonic, current, current harmonic, ground fault voltage, ground fault current, electric energy, etc.) input from the modem 6 ) For storing the measured data storage unit 22
Based on the harmonic data stored in the measurement data storage unit 22, whether the harmonic is generated upstream from the measurement point where the voltage measurement device and the current measurement device are installed, or is generated downstream. A determining unit 25 for determining whether the user is present
And an output unit 26 that outputs the result of the determination.
The output unit 26 includes, for example, a display screen such as a CRT for displaying the determination result, a printer 9 (see FIG. 4) for printing out the determination result, and an alarm device such as a buzzer or a lamp for notifying the occurrence of a harmonic. ing.

FIG. 6 is a block diagram showing a part of the internal configuration of the management personal computer 7, and corresponds to claim 5.

That is, a control unit 31 for controlling the management personal computer 7 and a measurement data storage unit for storing various measurement data (voltage, current, ground fault voltage, ground fault current, electric energy, etc.) inputted from the modem 6. 32, a harmonic calculator 33 for calculating data related to harmonics based on the voltage and current stored in the measurement data storage 32, and a harmonic for storing data related to harmonics calculated by the harmonic calculator 33. Based on the harmonic data stored in the data storage unit 34 and the harmonic data storage unit 34, whether a harmonic is generated upstream of the measurement point where the voltage measurement device and the current measurement device are installed, And a output unit 3 for outputting a result of the determination by the determination unit 35.
It consists of six. The output unit 36 includes, for example, a display screen such as a CRT for displaying the determination result, a printer 9 (see FIG. 4) for printing out the determination result, and an alarm device such as a buzzer or a lamp for notifying the occurrence of harmonics. ing.

In FIGS. 5 and 6, the process of determining the harmonics in the management personal computer 7 is the same as the process described with reference to FIGS. 2 and 3.

In the above embodiment, since the electric energy data is stored in the maintenance personal computer 3 and the management personal computer 7, for example, a large number of power receiving / distributing facilities 1 are installed on the premises of a factory or the like. In the case where the personal computer 3 manages these collectively, the power consumption of the power equipment at the site where one power receiving / distributing equipment 1 is installed is small, and the other power receiving / distributing equipment 1 is installed. Since it is also known that the power consumption of the power equipment on the site is large, the power management such as changing the distribution of the power amount according to the use state is also possible. Such power management can be similarly performed in the management personal computer 7 bidirectionally connected to the maintenance personal computer 3.

[0039]

According to the present invention, there is provided a monitoring apparatus for power distribution and distribution equipment, comprising: a voltage measuring means and a current measuring means provided in the power receiving and distribution equipment; a voltage value measured by the voltage measuring means; Output means for outputting each of the measured voltage harmonic, the current value measured by the current measuring means, and the current harmonic calculated from the current value. That is, by monitoring the voltage value, the current value, the harmonics, and the like as needed, it is possible to prevent a major accident such as a failure of the power device caused by the harmonics, an explosion, or a fire.

Further, the monitoring apparatus for power distribution and distribution equipment according to the present invention comprises a voltage measuring means and a current measuring means provided in the power receiving and distribution equipment, a voltage value measured by the voltage measuring means and a voltage value calculated from the voltage value. Output means for outputting each data of the measured voltage harmonic, the current value measured by the current measuring means, and the current harmonic calculated from the current value, and the harmonic is measured based on the data of each harmonic. Determining means for determining whether the means and the current measuring means are generated on the upstream side of the installed measuring point or on the downstream side, and output means for outputting a determination result by the determining means. It is provided with a configuration. In other words, by monitoring the harmonics as needed, and by discriminating and reporting the location of the harmonics, it is possible to prevent major accidents such as power equipment failures, explosions, and fires caused by harmonics. You can do it.

Further, in the remote monitoring system for power receiving and distribution equipment according to the present invention, the monitoring device and the remote control device are connected via a communication line, and the remote control device is connected to each harmonic transmitted from the monitoring device. A determination means for determining whether the harmonic is generated upstream or downstream of a measurement point at which the voltage measurement means and the current measurement means are installed, and Output means for outputting the determination result. In the remote monitoring system for power distribution equipment according to the present invention, the monitoring device and the remote control device are connected via a communication line, and the monitoring device includes a voltage measuring unit and a current measuring device provided in the power transmission and distribution equipment. Means, and transmission means for outputting each data of the voltage value and the current value measured by the voltage measurement means and the current measurement means through a communication line. A harmonic calculating means for calculating data on each of the harmonics based on the harmonic calculated by the harmonic calculating means, the harmonic being located upstream of a measurement point where the voltage measuring means and the current measuring means are installed. And an output unit that outputs a result of the determination by the determination unit. That is, by monitoring the harmonics from time to time with a remote control device installed at a location distant from the facility where the receiving and distribution equipment is installed, the power generated by the harmonics can be obtained even if the user is not at the power equipment facility. Since a major accident such as a device failure, explosion, or fire can be detected in advance, a prompt and appropriate response can be made thereafter.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a monitoring apparatus for power distribution equipment of the present invention.

FIG. 2 is a block diagram showing a part of an internal configuration of a maintenance personal computer.

FIG. 3 is a chart showing an example of amplitude and phase data of each harmonic stored in a harmonic data storage unit.

FIG. 4 is a schematic diagram showing the entire configuration of a remote monitoring system for power distribution equipment of the present invention.

FIG. 5 is a block diagram showing a part of the internal configuration of the management personal computer.

FIG. 6 is a block diagram showing a part of an internal configuration of a management personal computer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power receiving and distribution equipment 2 Panel box 3 Maintenance personal computer (monitoring device) 4, 6 Modem 5 General public line 7 Management personal computer (remote control device) 11, 21, 31 Control unit 12, 22, 32 Measurement data storage unit 13 , 33 Harmonic calculation unit 14, 34 Harmonic data storage unit 15, 25, 35 Discrimination unit 16, 26, 36 Output unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Ito 681 Nihonkoji-dori, Karasuma-Higashi-Iri-Nori Honen Teramachi (Hattori Building), Kyoto Trust Co., Ltd. (72) Inventor Hiroki Okada Tenma, Kita-ku, Osaka-shi 1-3-3, Kinki Electric Construction Security Co., Ltd.

Claims (5)

[Claims] 1. A voltage measuring means and a current measuring means provided in a power receiving / distributing facility, a voltage value measured by the voltage measuring means, a voltage harmonic calculated from the voltage value, and a voltage harmonic measured by the current measuring means. Output means for outputting each data of the obtained current value and the current harmonic calculated from the current value. 2. Based on each of the harmonics, it is determined whether the harmonic is generated upstream or downstream from a measurement point where the voltage measuring means and the current measuring means are installed. 2. The monitoring apparatus according to claim 1, further comprising: a discriminating unit for discriminating; and an output unit for outputting a result of the discrimination by the discriminating unit. 3. The monitoring device according to claim 1, wherein the monitoring device and the remote operation device are connected via a communication line, and the output means of the monitoring device communicates with the remote operation device. A remote monitoring system for power receiving / distributing equipment, comprising transmission means for outputting data through a line. 4. The transmitting device according to claim 1, wherein the monitoring device and the remote control device are connected via a communication line, and the output device of the monitoring device outputs data to the remote control device through the communication line. The remote control device is configured such that, based on each harmonic transmitted from the monitoring device, the harmonic is generated upstream of the measurement point where the voltage measurement unit and the current measurement unit are installed. Are you
A remote monitoring system for power receiving and distributing equipment, comprising: a discriminating means for discriminating whether a signal is generated on the downstream side; and an output means for outputting a discrimination result of the discriminating means. 5. A monitoring device and a remote control device are connected via a communication line, wherein the monitoring device includes a voltage measuring unit and a current measuring unit provided in the power distribution and distribution equipment, and the voltage measuring unit and the current measuring unit. Transmitting means for outputting each data of the voltage value and the current value measured by the means through the communication line, wherein the remote control device relates to each harmonic based on each data transmitted from the monitoring device. Harmonic calculation means for calculating data, based on the harmonics calculated by the harmonic calculation means, the harmonics are generated upstream from the measurement point where the voltage measurement means and the current measurement means are installed The power receiving and distribution equipment, comprising: a determining means for determining whether the signal is generated on the downstream side; and an output means for outputting a result of the determination by the determining means.隔監 vision system.