JP2010197339A - Power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of power management by detecting that a power supply state is unsuitable, and especially to achieve the function with a small change applied to existing power supply systems or instruments. <P>SOLUTION: In this power supply device provided with a watt-hour meter for three-phase 200 V and a watt-hour meter for single-phase 100 V, respective three lines of three power supply lines for supplying the power of three-phase 200 V or three power supply lines for supplying the power of single-phase 100 V are treated as a set collectively, and some of sets is mounted as the set as it is on the same current transformer, and it is detected that the power supply state is in an unsuitable state, based on detection of a leakage current by the current transformer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power supply device that supplies three-phase alternating current and single-phase alternating current simultaneously.

  Conventionally, power is generally supplied by three-phase AC, but both 200V three-phase AC and 100V single-phase AC may be supplied as required by the customer. In this case, the watt-hour meter has a three-phase power watt-hour meter that measures the three-phase AC power amount and a single-phase watt-hour meter that measures the single-phase AC power amount on each power supply line. .

  By the way, when the two types of power supply lines are drawn into the consumer in this way, the type of the power supply line should be clearly understood by the consumer, but depending on the consumer, There is a risk of mixing multiple types of power supply lines.

  For example, in the case of indoor wiring, only qualified persons can originally perform construction, but some customers are in their homes, so amateur construction is performed without knowing that it is illegal There is no risk of improper use of power, such as misuse or mixing of power supply lines.

  Inappropriate use of power, such as misuse or mixing of the types of power supply lines, may naturally cause malfunctions or damage to used consumer electrical equipment. If mixed, high voltage may be applied to the low-voltage, low-current power supply system, or a large current may flow, causing damage to the power supply system such as a transformer or malfunctioning of the instruments. There is a possibility of causing a problem such as causing it (Patent Document 1), which causes a problem in power supply management.

Utility Model Registration No. 3079352

  As described above, when both 200V three-phase alternating current and 100V single-phase alternating current are supplied to consumers, the power supply line supplying 200V three-phase alternating current and the power supplying 100V single-phase alternating current are supplied. Inappropriate power usage state where a combination of a 200V three-phase AC power supply line and a 100V single-phase AC power supply line is used as a power source for some reason. If this occurs, the power supply system may be damaged or the instrument may malfunction, which may cause problems in power supply management.

  The present invention provides a 200V three-phase AC power supply line and a 100V single-phase AC power supply line for some reason when both 200V three-phase AC and 100V single-phase AC are supplied to consumers. When an inappropriate power usage state using a combination of and power is detected, it detects that the power supply state is inappropriate and tries to solve the power management problem. By adding a relatively simple device, the purpose is to realize the function while making minor changes to the existing power supply system and instruments.

  The inventor has conceived that the power supply state is inappropriate by using a current transformer, and has completed the present invention.

  (1) A power supply device provided with a three-phase 200V watt-hour meter and a single-phase 100V watt-hour meter, wherein the three-phase 200V watt-hour meter is connected to a three-phase AC power source and is 200V It is assumed that three power supply lines for supplying three-phase AC power are installed, and the single-phase 100V watt-hour meter is one of the three power supply lines connected to the single-phase AC power supply. The three power supply lines configured to ground a book and supply power with a single-phase AC of 100 V between the grounded power supply line and the other power supply lines in an opposite phase relationship to each other The three power supply lines that supply the three-phase 200V power or the three power supply lines that supply the single-phase 100V power are grouped together. , One of those pairs remains the same Attached to the vessel, based on the detection of the current transformer leakage current (asymmetric min), and detecting that the power supply state is an unsuitable condition.

  In the current transformer of (1), three power supply lines constituting a three-phase 200V power supply line, or three power supply lines supplying the single-phase 100V power, each of which is a batch of three. Then, it is set as a set, and one of those sets is attached to the same current transformer as the set. When a consumer's electrical equipment is properly connected to the three-phase 200V power supply line, or when a consumer's electrical equipment is properly connected to the single-phase 100V power supply line, three-phase Since the symmetry regarding the alternating current and the single-phase alternating current is maintained, the current transformer does not detect the leakage current (asymmetrical amount).

  When a three-phase 200V power supply line is mixed with a single-phase 100V power supply line and a consumer's electrical equipment is connected, the current from the three-phase 200V power supply line is a single-phase 100V power supply line. As a result, the symmetry about the current of the three-phase alternating current and the single-phase alternating current is lost, and the three-phase 200V three power supply lines or the single-phase 100V three power supply lines are collectively attached. In such a current transformer, a leakage current (asymmetric part) flows. This is because if the current transformer detects a leakage current (asymmetry), it is detected that the power supply state is inappropriate, and the location of the problem in power management becomes clear, which contributes to the solution. . In addition, in the present plan, it is sufficient to add a simple device that detects a leakage current (asymmetric part) by installing a current transformer, so that the change to the existing power system is slight.

  (2) Furthermore, when the said current transformer detects a leakage current (asymmetric part), the display means which displays that an electric power supply state is an improper state is provided.

  By providing the display means of (2), it is immediately recognized that the power supply state is inappropriate just by visually recognizing the display of the display means, and the problem in power management can be solved early. .

  (3) Further, the current transformer and the display means are housed and installed in a casing of a watt hour meter for the power supply line on the side where the current transformer is provided.

  The current transformer of (3) and the display means are accommodated and installed in the casing of the watt hour meter for the power supply line on the side where the current transformer is provided, so that it is necessary in advance in the manufacturing process of the watt hour meter. Therefore, additional work at the installation site of the watt hour meter is reduced.

  In the current transformer of the present invention, three power supply lines constituting a three-phase 200V power supply line, or three power supply lines for supplying the single-phase 100V power, respectively, are bundled. Since one of those sets is attached to the same current transformer as the set, when the electrical equipment of the customer is appropriately connected to the three-phase 200V power supply line, When the electrical equipment of the customer is properly connected to the single-phase 100V power supply line, the current transformer leaks because the symmetry about the three-phase alternating current and the single-phase alternating current is maintained. Does not detect current (asymmetrical). In addition, when a three-phase 200V power supply line and a single-phase 100V power supply line are mixed and a consumer's electrical equipment is connected, the current from the three-phase 200V power supply line is a single-phase 100V power. Flows to the supply line side. Therefore, the symmetry regarding the current of the three-phase alternating current and the single-phase alternating current is lost, and the current transformers that are collectively attached to the three-phase 200V three power supply lines or the single-phase 100V three power supply lines. Leakage current (asymmetric part) flows through the vessel. This is because if the current transformer detects a leakage current (asymmetry), it is detected that the power supply state is inappropriate, and the location of the problem in power management becomes clear, which contributes to the solution. . In addition, in the present plan, it is sufficient to add a simple device that detects a leakage current (asymmetric part) by installing a current transformer, so that the change to the existing power system is slight.

It is a figure which shows the 1st Embodiment of this invention. It is a block diagram of the display means of this invention. It is a conceptual diagram which shows the utilization form of the improper state information obtained by this invention. It is a figure which shows the 2nd Embodiment of this invention.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In these figures, 1 and 2 are transformers, 3 is a 200V power supply line, 5 is a 100V power supply line, a 200V watt-hour meter 7 is also supplied to the 200V power supply line, and a 100V power supply is also supplied. A 100 V watt-hour meter 9 is installed on each line 5, and each is connected to a power load 11 or a lamp load 13.

  These transformers 1 and 2 are each applied with a three-phase alternating current of 6000 V from the same power source. The transformer 1 generates an alternating current of 200 V between the terminal 15 and the terminal 17. The transformer 2 similarly generates an alternating current of 200 V between the terminal 17 and the terminal 19. Here, since the transformer 1 and the transformer 2 share the terminal 17, a potential difference of 200V is generated between the terminal 15 and the terminal 19, and a 200V three-phase alternating current is generated as a whole. The three power supply lines extending from the terminal 15, the terminal 17, and the terminal 19 toward the 200 V watt-hour meter 7 constitute the 200 V power supply line 3.

  On the other hand, the transformer 2 is provided with a terminal 21 at the intermediate point of the secondary side coil. Since the power supply line connected to this terminal is grounded, the terminal 21 and the terminal 17 are connected. This is a so-called single-phase three-wire system in which a potential difference of 100 V is generated between the terminal 21 and the terminal 19 to form a single-phase alternating current. In this case, these single-phase alternating currents have an opposite phase relationship. Three power supply lines extending from these terminals 17, 19, 21 to the 100 V watt-hour meter 9 side constitute a 100 V power supply line 5. However, since the wire extending from the terminal 21 is grounded as described above, it contributes to the supply of single-phase power from each of the terminals 17 and 19 as a neutral wire.

  The 200V power supply line 3 configured as described above and including three power supply lines is connected to the input terminals 23u, 23v of the 200V watt-hour meter 7 via the detection device 40 (described in detail later). 23w. That is, the power supply line extending from the terminal 15 is connected to the input side terminal 23u, the power supply line extending from the terminal 17 is connected to the input side terminal 23v, and the power supply line extending from the terminal 19 is connected to the input side terminal 23w.

  In the 200V watt-hour meter 7, voltage coils 25u and 25w are respectively connected to two of the three power supply lines that supply three-phase alternating current and connected to the input side terminal 23u and the input side terminal 23w. In addition, current coils 27u and 27w are connected to each other.

  The voltage coils 25u and 25w and the current coils 27u and 27w constitute a power detection means as a pair, and are not shown due to the moving magnetic field generated in the voltage coils 25u and 25w and the current coils 27u and 27w. The aluminum disk is rotated, and the amount of power used according to the current flowing through the 200 V power supply line 3 is displayed from the amount of rotation of the aluminum disk.

  Then, after passing through the current coils 27u and 27w, the power supply line extending from the terminal 15 and connected to the input side terminal 23u is connected to the output side terminal 29u and from the terminal 19 to the input side terminal 23w. The power supply lines are respectively connected to the 23 output side terminals 29w. The power supply line extending from the terminal 17 and connected to the input side terminal 23v does not include the power detection means as described above, and is directly connected to the output side terminal 29v together with the circuit passing through each voltage coil. Has been.

  In this manner, 200 V three-phase alternating current is output to the three output terminals 29u, 29v, and 29w, and the power load 11 is connected to the three output terminals 29u, 29v, and 29w via a breaker (not shown).

  On the other hand, the three power supply lines extending from the terminals 17, 19, and 21 of the transformer 2 to the 100V watt-hour meter 9 side are connected to the input-side terminals 31v, 31w, and 31u of the 100V watt-hour meter 9, respectively. ing.

  In the 100V watt-hour meter 9, as in the 200V watt-hour meter 7, voltage coils 33v and 33w and current coils 35v and 35w are respectively installed on the power supply lines extending from the input side terminals 31v and 31w. The amount of power used by configuring the same power detection means as described above is displayed. The power supply line extending from the input terminal 31u is a neutral wire that is grounded, and no power detection means as described above is provided. The power supply line extending from the input terminals 31v and 31w and the power supply line extending from the input terminal 31u and functioning as a neutral line are connected to the output terminals 37v, 37w and 37u, respectively. The lamp load 13 is connected between the input side terminal 31v and the input side terminal 31u and between the input side terminal 31w and the input side terminal 31u via a breaker (not shown). ing.

  In the first embodiment, a detection device 40 for detecting an inappropriate use state of power is installed in the 200 V power supply line 3 of the power supply device configured as described above. The detection device 40 may be provided on the 100 V power supply line side.

  As shown in FIG. 2, the detection device 40 includes a current transformer 41 as a detection means, a control means 42, and an output means 43.

  The current transformer 41 is, for example, a through shape having an annular outer shape with a circular through hole in the center, but is not limited to the shape and type. As shown in FIG. 1, the current transformer 41 collectively detects a group of three power supply lines constituting the 200 V power supply line 3 and attaches them to the common current transformer 41 to detect the present case. It is made to function as a means.

  In other words, the three current supply lines constituting the three-phase 200V power supply line 3 are collectively attached to the current transformer 41, so that the three-phase 200V power supply line 3 can be appropriately used. If the electrical equipment of the customer is connected to the current, the current value detected is 0 because the symmetry about the current of the three-phase AC is maintained, and the current transformer 41 detects the leakage current (asymmetric part). do not do.

  On the other hand, when the three-phase 200V power supply line 3 and the single-phase 100V power supply line 5 are mixed and connected to the consumer's electrical equipment, three three-phase 200V power supply lines 5 are used. Since the current flows from either of the currents to the single-phase 100V power supply line 5 side, the symmetry of the three-phase alternating current is impaired. Therefore, a leakage current (asymmetric part) flows through the current transformer 41 in which three three-phase 200 V power supply lines are collectively attached. From the above knowledge, when the current transformer 41 detects an imbalanced current and detects an inappropriate power usage state, the detected electrical signal is transmitted to the next control means 42.

  The control means 42 includes a signal processing circuit 44, an arithmetic control unit 45 and an output means 43, and 51 is a power line for the control means 42. The signal processing circuit 44 converts the electrical signal from the current transformer 41 into a digital signal. The signal from the current transformer 41 converted into a digital signal is sent to the arithmetic control unit 45.

  The arithmetic control unit 45 includes a signal transmission system 46, a storage unit 47, and an arithmetic control circuit 48.

  The signal transmission system 46 can have a bidirectional or unidirectional signal transmission function between the storage unit 47 and the arithmetic control circuit 48, the signal processing circuit 44, the setting input unit 49, and the output unit 43. In addition, the storage unit 47 stores a program of an arithmetic processing procedure according to the present embodiment, and stores various setting values input from a setting input unit 49 described later. The arithmetic control circuit 48 performs various arithmetic operations based on a program stored in the storage unit 47 and controls the operation of each internal circuit unit, the signal processing circuit 44, the output unit 43, and the like. The setting input means 49 is for inputting a program and various setting values necessary for calculation, output or display of the present embodiment. What has been set and input via the setting input means 49 by setting values and programs in the calculation control unit 45 is stored in the storage unit 47 of the calculation control unit 45.

  The output means 43 is, for example, a liquid crystal display, and performs a predetermined warning display when the use of the 200V power supply line 3 and the 100V power supply line 5 is inappropriate. Further, the output means 43 may be a warning lamp that is turned on in such a case. Further, the output unit 43 may be a known communication unit 52. For example, as illustrated in FIG. 3, the communication unit 52 may be caused to perform automatic transmission using a signal directed to the output unit 43 as a trigger.

  As described above, since the control means 42 is configured, when the current transformer 41 detects a leakage current (asymmetric part) and detects an inappropriate power supply state, the detected electrical signal is The signal is converted into a digital signal by the signal processing circuit 44 and transmitted from the signal transmission system 46 of the calculation control unit 45 to the calculation control circuit 48. The arithmetic control circuit 48 confirms the input of the digital signal, reads out the required data from the data stored in the storage unit 47 in advance, forms a required display screen, and returns it to the signal transmission system 46. Then, it is transmitted to the liquid crystal display as the output means 43 and a predetermined display is performed on the display screen.

  Further, as mentioned above, when a known communication means 52 such as a mobile phone is used as the output means 43, it is necessary to construct a communication system as shown in FIG. 3 in advance. . The concept of the system shown in FIG. 3 functions as follows. The output from the arithmetic control unit 45 is output toward the communication unit 52, and the communication unit 52 transmits a predetermined alarm signal to the management server 53 via the network 55 using this output as a trigger. Upon receiving the alarm signal, the management server 53 confirms that the alarm signal is the predetermined alarm signal, reads out necessary information such as the location of the communication means 52 that issued the alarm signal, and automatically uses the cellular phone of the worker, etc. Warning information and related information such as location are transmitted to the communication means 54 via the network 55. In response to this, the worker goes to the location of the communication means 52 that issued the alarm signal, and the power supply system is inspected and repaired to eliminate the inappropriate power supply state.

  Next, the second embodiment shown in FIG. 4 will be described. The same parts as those in the first embodiment described above are denoted by the same reference numerals in the drawing, the description thereof will be omitted, and different. Only the part will be described below.

  This second embodiment differs from the first embodiment described above in the arrangement of the detection device 40. In the first embodiment, the detection device 40 is installed separately from the 200V watt-hour meter 9, but in the second embodiment, the entire detection device 40 is installed in the 200V watt-hour meter. 9 casing 57 is formed somewhat larger, and the entire detection device 40 is stored in the casing 57. In this embodiment, the entire detection device 40 means a current transformer 41, a control means 42, and a display as the output means 43, and the display surface of the display is from the outside of the casing 57. It is desirable to store and install it so that it can be seen.

  By configuring in this way, many processes such as wiring and connection for installing the detection device 40 can be performed in advance at the manufacturing factory simultaneously with the manufacturing process of the watt-hour meter. There is an advantage to be reduced, and the work time at the installation site can be shortened, so that the power outage time of the customer can be shortened.

  In addition, in 1st and 2nd embodiment demonstrated above, although what attached the current transformer 41 to the 200V power supply line 3 which is a three-phase alternating current was demonstrated, this invention is not restricted to this, It is good also as attaching the current transformer 41 to the location corresponding to the 100V power supply line 5 side which is a single phase alternating current. In this case, as in the case of three-phase alternating current, the sum of the currents of the three wires becomes 0, and can be implemented in the same manner as described above. Further, even when the number of single-phase AC 100V power supply lines is two, the sum of the currents of the two lines becomes 0, and the same can be implemented.

DESCRIPTION OF SYMBOLS 1 Transformer 2 Transformer 3 200V power supply line 5 100V power supply line 7 200V watt hour meter 9 100V watt hour meter 11 Power load 13 Light load 15 Terminal 17 Terminal 19 Terminal 21 Terminal 23u Input side terminal 23v Input Side terminal 23w Input side terminal 25u Voltage coil 25w Voltage coil 27u Current coil 27w Current coil 29u Output side terminal 29v Output side terminal 29w Output side terminal 31u Input side terminal 31v Input side terminal 31w Input side terminal 33v Voltage coil 33w Voltage coil 35v Current Coil 35w Current coil 37u Output side terminal 37v Output side terminal 37w Output side terminal 40 Detector 41 Current transformer 42 Control means 43 Output means 44 Signal processing circuit 45 Operation control section 46 Signal transmission system 47 Storage section 48 Operation control circuit 49 Setting Input means 51 Power line 52 Communication means 53 Management server 54 Communication means 55 Network 57 Casing

Claims (3)

A power supply device provided with a three-phase 200V watt-hour meter and a single-phase 100V watt-hour meter,
The three-phase 200V watt-hour meter is installed on three power supply lines that are connected to a three-phase AC power supply and supply 200V three-phase AC power.
The single-phase 100V watt-hour meter grounds one of the three power supply lines connected to the three-phase AC power supply, and connects the grounded power supply line and the other power supply lines. It is assumed that the three power supply lines configured to supply power with a single-phase alternating current of 100 V between them in an opposite phase relationship with each other are installed.
Three power supply lines for supplying the three-phase 200V power or three power supply lines for supplying the single-phase 100V power,
Attach one of those sets to the same current transformer as a set,
A power supply device that detects that the power supply state is inappropriate based on detection of an unbalanced current by the current transformer.   2. The power supply apparatus according to claim 1, further comprising a display unit configured to display that the power supply state is inappropriate when the current transformer detects a leakage current.   3. The electric power according to claim 1, wherein the current transformer and the display means are housed and installed in a casing of a watt hour meter with respect to the power supply line on the side where the current transformer is provided. Feeding device.

Images