JP2009168604A - Momentary power failure prediction device and system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a momentary power failure prediction system and device for certainly and efficiently avoiding momentary power failure damage by previously predicting occurrence of momentary power failure. <P>SOLUTION: A terminal device 3 installed at customers A, B or the like determines occurrence of leakage current based on the information on leakage current and current direction detected by an momentary power failure detecting sensor 5, and transmits information showing occurrence of leakage current and the current value as thunderbolt pulse data to the momentary power failure prediction device 1 via the Internet 2. When the thunderbolt pulse data is input from the terminal device 3 in a dynamic momentary power failure occurrence warning area, the momentary power failure prediction device 1 issues a momentary power failure occurrence alarm and transmits an evacuating command to the terminal device 3. Thus, the terminal device 3 starts a generator 4 and converts the state of an essential load 7 from a commercial electric power operation state into a self operation state by the generator 4. Thus, even when momentary power failure is caused by the thunderbolt in a factory where a momentary power failure alarm is issued, the essential load 7 can continue the operation without being affected by the momentary power failure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for predicting a voltage drop caused by a voltage drop generation source such as a thundercloud.

  Conventionally, a power transmission / transformation facility that detects a fault current that flows through a transmission line when a lightning strikes a power transmission tower, etc., identifies a fault section that is affected by a lightning strike based on this fault current, and isolates the specified fault section is known. It has been. According to this transmission and substation equipment, it is possible to prevent the occurrence of a power failure. In general, a temporary voltage drop that does not result in a power failure, that is, an instantaneous drop occurs within a short period of time between the occurrence of a lightning strike and the disconnection of a failure section. This instantaneous voltage drop is called instantaneous drop.

  As a system for predicting an instantaneous drop due to such a lightning strike, for example, there is a system described in Patent Document 1. This instantaneous drop prediction system stores past lightning strike data and instantaneous drop data, uses this lightning strike data and meteorological data to predict the location of the lightning strike, and determines the possibility of lightning protection from the lightning strike risk due to geographical factors. It extracts high transmission line data and calculates the instantaneous drop probability of transmission line equipment. According to this system, it is possible to reduce the burden on the operator of the electric power system and the electric power user, and easily determine lightning damage.

  Patent Documents 2 and 3 disclose systems that provide lightning strike risk information. The system of Patent Literature 2 obtains a lightning probability based on data indicating a thundercloud position and track length and position data, and provides danger information according to the lightning probability. According to this system, warning against lightning strikes can be issued early, and the scale of thunderclouds can be distinguished. The system of Patent Document 3 receives lightning position information from the lightning position location system, predicts a future lightning position from the lightning position information, and recognizes the current position of the user from the current position information transmitted from the mobile terminal. Then, based on these pieces of position information, it is determined whether or not the user is located in the danger area, and danger information is provided. Thereby, the danger information of a lightning strike can be provided according to a user's position.

JP 2003-90887 A JP 2005-56279 A JP 2006-242885 A

  However, in the system of Patent Document 1 described above, it is necessary to use meteorological data in order to predict the destination of the lightning strike, and it only calculates the instantaneous drop probability and distributes the information. Therefore, in order to predict the destination of the lightning strike, it is necessary to provide an inference engine, so that there is a problem that a complicated calculation is required and the load increases. In addition, there is a problem that it is not always possible to reliably and efficiently avoid the damage caused by the sag by simply calculating and distributing the sag probability.

  Therefore, the present invention has been made paying attention to such a problem, and the purpose thereof is to predict the occurrence of a sag in advance so that a sag can be reliably and efficiently avoided. It is to provide a prediction system and apparatus.

  A voltage sag prediction device according to the present invention predicts a voltage sag of a target position caused by a voltage sag occurrence source, and is affected by the voltage sag generation source from a plurality of facilities including the target position. Input information indicating, calculating the position of the source of voltage sag based on the information, setting a warning area, information indicating that the source of the voltage sag is affected from the equipment in the warning area And a means for transmitting, to the target position, a command for operating a load operated with commercial power of a predetermined power transmission system at the target position with other independent power when input. To do.

  Further, a voltage sag prediction device according to the present invention is a device that predicts a voltage sag of a target position caused by a voltage sag source, and leaks more than a preset threshold value from equipment at a plurality of positions including the target position. Information indicating that a current has occurred is input, and a static sag occurrence warning area setting means for setting a static sag occurrence warning area based on the target position based on the information, and the leakage current has occurred When the information indicating that is input from the equipment at the position in the static sag occurrence warning area, a warning issuing means for transmitting a command to issue a sag occurrence warning warning to the target position, and a plurality of including the target position Dynamic information that inputs information indicating that a leakage current exceeding a preset threshold value has occurred from the equipment at the position and sets a dynamic sag occurrence warning area based on the target position based on the information Suddenly low alert When the setting means and the information indicating that the leakage current has occurred are input from the equipment at the position in the dynamic sag occurrence warning area, the load operated by the commercial power of the predetermined power transmission system And a power transmission system disconnecting means for transmitting a command for operating with independent power to the target position.

  Alternatively, in the voltage sag prediction device according to the present invention, the power transmission system disconnection means further detects that a leakage current greater than a preset threshold value input from a plurality of facilities including the target position has occurred. Based on the information shown, the position of the source of the voltage sag is obtained, the position after a predetermined time is predicted, and when the predicted position is present in the dynamic voltage sag occurrence warning area, A command for operating a load operated by commercial power with other independent power is transmitted to the target position.

  Further, the voltage sag prediction device according to the present invention further includes inputting the information indicating that the leakage current has occurred from the equipment at the position in the dynamic voltage sag occurrence warning area, and then the information for a preset time. The power transmission system returning means for transmitting to the target position a command for operating other loads operating with independent power with commercial power when the power is not input.

  Further, the voltage sag prediction device according to the present invention further includes inputting the information indicating that the leakage current has occurred from the equipment at the position in the dynamic voltage sag occurrence warning area, and then the information for a preset time. Or the position of the voltage sag occurrence source after the predetermined predetermined time is present in the dynamic voltage sag occurrence warning area, and then the position is outside the dynamic voltage sag occurrence warning area. In this case, it is characterized by comprising a power transmission system return means for transmitting a command for operating a load operated by other independent power using commercial power to the target position.

  Further, the voltage sag prediction system according to the present invention predicts a voltage sag generated by a power source and a plurality of positions including a target position where a voltage sag is predicted from information from the power facility. In a voltage sag prediction system configured with a device, a sensor for detecting the leakage current value and its direction, and information indicating that a leakage current has occurred due to the leakage current value and its direction detected by the sensor It is comprised by the equipment provided with the terminal device which produces | generates and transmits to a voltage drop prediction apparatus, and the voltage drop prediction apparatus.

  As described above, according to the present invention, it is possible to realize a voltage sag prediction system and apparatus that can reliably and efficiently avoid voltage sag damage by predicting the occurrence of voltage sag in advance.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an overall configuration of a voltage sag prediction system including a voltage sag prediction device according to an embodiment of the present invention. This instantaneous drop prediction system includes, for example, a terminal device 3, a generator 4, an instantaneous drop detection sensor 5, a circuit breaker 6, an important load 7, a general load 8, and power receiving equipment provided for each customer factory (customers A, B, etc.) 9 and a voltage drop prediction device 1 that detects lightning strikes of customers A and B (where the terminal device 3 is installed) and predicts the occurrence of a voltage drop in advance. The terminal devices 3 (3-1, 3-2, etc.) provided to the customers A, B, etc. and the voltage drop prediction device 1 are connected via the Internet 2.

  Here, in the factories of each customer A, B, etc., the electric power from the power transmission system of the electric power company is supplied to the general load 8 by the power receiving facility 9 and is also supplied to the important load 7 through the circuit breaker 6. Assume that the load 8 and the important load 7 are in operation. The circuit breaker 6 is set to OFF which is not in a cut-off state (is in an energized state).

  In such an operating state, the terminal device 3 inputs the leakage current and current direction information detected by the voltage sag detection sensor 5, and each current direction (the direction of the current is directed from the ground to the external power transmission system or the like). , And the direction from the external power transmission system to the ground (details will be described later). The leakage current is compared with a preset threshold value. If the leakage current is equal to or greater than the threshold value, The data name and current value are transmitted to the instantaneous drop prediction device 1 via the Internet 2. The sag detecting sensor 5 is a sensor for detecting a leakage current that increases due to the influence of thunderclouds and detecting the direction of the current. Further, when the voltage sag prediction device 1 issues a voltage sag occurrence warning and transmits a evacuation command based on lightning pulse data collected from the terminal device 3, the terminal device 3 receives the evacuation command and sends the generator 4. The important load 7 is brought into an automatic synchronous operation state by the commercial power supplied from the electric power company and the power supplied from the generator 4. And the circuit breaker 6 is set to ON which is a interruption | blocking state, and the important load 7 is made into the independent operation state by the generator 4. FIG. As a result, even if a lightning strike caused by a lightning strike occurs at a factory where a voltage drop warning is issued, the critical load 7 is in a self-sustained operation state by the generator 4, and thus continues to operate without being affected by the voltage drop. can do.

  When the instantaneous drop prediction device 1 cancels the instantaneous drop occurrence alarm and transmits a return command, the terminal device 3 receives the return command, sets the circuit breaker 6 to OFF, which is the energized state, and the important load 7 Are brought into an automatic synchronous operation state by commercial power supplied from an electric power company and electric power supplied from the generator 4. Then, the generator 4 is stopped, and the important load 7 is brought into a commercial operation state using electric power from the electric power company. Thereby, when the instantaneous drop occurrence alarm is canceled, the important load 7 is switched from the self-sustained operation state to the commercial operation state, and thus can be returned to the normal operation state.

  FIG. 2 is an outline of a power supply connection diagram in a factory such as customers A and B where the power failure detection sensor 5 shown in FIG. 1 is installed. This power supply system shows a period from when power is supplied from the power receiving facility 9 until the power is distributed to each system after the disconnectors 73-1 to 73-5. The circuit breakers 61, 68 and 74, current sensors are shown. 51, 71, zero-phase voltage detector 52, instrument transformer 63, disconnectors 64, 73, partial discharge detection sensor 65, lightning arrester 66, LA sensor 67, watt hour meter 69, overcurrent relay 70, auxiliary instrument transformer A current transformer 72, an instrument current transformer 75, a phase advance capacitor 76, a transformer 77, and a temperature sensor 78 are provided.

  The current sensor 51 and the zero-phase voltage detection device 52 correspond to the voltage sag detection sensor 5 shown in FIG. Further, the important load 7 and the general load 8 shown in FIG. 1 are connected to any of the distributed systems, and the circuit breaker 74 corresponds to the circuit breaker 6 shown in FIG. FIG. 1 shows the concept of connection. Actually, the critical load 7 and the general load 8 are blocked by the circuit breaker 74 in the system shown in FIG.

  In FIG. 2, the terminal device 3 inputs the leakage current absolute value in the main current of the power supply system from the current sensor 51, and receives direction determination reference information (a, b) that is the direction of the leakage current from the zero-phase voltage detection device 52. input. Then, when the direction criterion information is a (the direction of the leakage current is the direction from the ground to the external power transmission system, etc.), and the leakage current absolute value is equal to or greater than a preset threshold value, Lightning pulse data meaning “high-voltage leakage current (induction)” is generated and transmitted to the instantaneous voltage drop prediction device 1. Further, the direction determination reference information is b (the direction of the leakage current is from the external power transmission system to the ground), and the absolute value of the leakage current is a preset threshold (light threshold) In the above case, lightning pulse data meaning “high-voltage leakage current (light)” is generated and transmitted to the instantaneous drop prediction device 1. Further, when the direction determination reference information is b and the leakage current absolute value is equal to or greater than a preset threshold value (a heavy threshold value, that is, a threshold value larger than a light threshold value), “ Lightning pulse data meaning “high-voltage leakage current (light) (heavy)” is generated and transmitted to the instantaneous drop prediction device 1.

  As shown in FIG. 2, the terminal device 3 includes the partial discharge information from the partial discharge detection sensor, the electric energy from the wattmeter 69, the received current and harmonic information from the auxiliary current transformer 72, the LA sensor. 67, abnormal voltage approach information and temperature information from temperature sensor 78 are also input.

  FIG. 3 is a block diagram showing a functional configuration of the instantaneous drop prediction device 1 shown in FIG. FIG. 4 is a flowchart showing processing of the instantaneous drop prediction device 1. With reference to FIG.3 and FIG.4, the instantaneous drop prediction apparatus 1 is demonstrated in detail. The voltage sag prediction device 1 includes a lightning pulse database 10, a static voltage sag occurrence warning area setting unit 11, a warning commanding unit 12, a dynamic voltage sag occurrence warning area setting unit 13, a power transmission system disconnecting unit 14, and a power transmission system recovery unit. 15 and communication means 16.

  The lightning pulse database 10 is composed of data generated based on lightning pulse data collected from the terminal devices 3 such as the customers A and B via the Internet 2, and each data is generated and stored by the alarm issuing means 12. The That is, in the lightning strike pulse database 10, information indicating that the customers A, B, etc. are affected by the lightning strike is stored in time series. FIG. 5 is a diagram illustrating a data configuration of the lightning pulse database 10. The data items of the lightning pulse database 10 are “time”, “customer No.”, “customer name”, “address”, “longitude”, “latitude”, “data name”, “measurement value”, “area”, and “prefecture”. “Time” indicates the year, month, day, hour, and day when the lightning issuing means 12 collected lightning pulse data via the Internet 2 and the communication means 16, that is, the time when the lightning pulse occurred. “Customer No.” and “Customer Name” indicate the index numbers and customer names of customers A and B from which lightning pulse data is collected. “Address” indicates the customer's address, and “longitude” and “latitude” indicate the customer's location information. “Data name” and “measured value” indicate the data name and current value of the leakage current in the collected lightning pulse data. “Data name” includes, for example, “high voltage leakage current (induction)”, “high voltage leakage current (light)”, “high voltage leakage current (light) (heavy)”, and “high voltage ground fault voltage”. The “high-voltage leakage current (induction)”, “high-voltage leakage current (light)”, and “high-voltage leakage current (light) (heavy)” are detected by the terminal device 3 as shown in FIG. The name is determined based on the signal from the device 52 and the threshold value. The “high-voltage ground fault voltage” is a name determined by the terminal device 3 based on signals from power facilities such as customers A and B (not shown in FIGS. 1 and 2).

  The communication unit 16 transmits and receives data via the Internet 2 between the alarm issuing unit 12, the power transmission system disconnecting unit 14, the power transmission system return unit 15, and the terminal device 3. Specifically, the communication unit 16 receives lightning pulse data from the terminal device 3. In addition, a command indicating that the instantaneous drop occurrence warning alarm input from the alarm issuing means 12 has been issued is transmitted to the terminal device 3. In addition, the save command input from the power transmission system disconnecting unit 14 and the return command input from the power transmission system recovery unit 15 are transmitted to the terminal device 3, respectively.

The static sag occurrence warning area setting means 11 performs the following procedure (1.1) to (1.3) for the customer A based on the data of the lightning pulse database 10 collected and stored in the past. , B, a static sag occurrence warning area (first warning area) is set (step S401).
(1.1) Calculate the moving speed of an instantaneous drop source such as a thundercloud.
Each data is read out from the lightning pulse database 10, and the customer's position (“longitude” and “latitude”) within a predetermined time is plotted to generate a polygon. Since the lightning pulse database 10 stores information indicating that it has been affected by a lightning strike, the generated polygon corresponds to an area affected by an instantaneous voltage drop within a predetermined time. Here, customers that are plotted inside the polygon are excluded, and only the customer position that is the vertex of the polygon is focused. Then, based on the “longitude” and “latitude” which are customer positions that are the vertices of the polygon, the center of gravity of the polygon is obtained, and the position of the center of gravity is set as the position of the instantaneous point generation source. Similarly, the position of the customer within the next predetermined time is plotted to generate a polygon, and the center of gravity is obtained as the position of the instantaneous drop generation source. In this way, the position of the instantaneous drop source can be obtained in time series, and the moving speed of the instantaneous drop source is obtained from the temporal change in the position of the instantaneous drop source. In this case, as for the position of the voltage drop source, the information of the position detected by the voltage drop source detection device (not shown) is received via the Internet or a satellite wireless link and stored in the lightning pulse database 10. You may make it read and specify from. For example, when the sag generation source is a thundercloud, the position information is received from the lightning strike detection device as the position information of the sag generation source and stored.
(1.2) The size of the warning area for occurrence of static sag is calculated.
The operator manually sets the radius of the static sag occurrence warning area by referring to the moving speed calculated in the above (1.1) and the preset warning time by means not shown. Here, the center point of the static sag occurrence warning area is the customer's position where the area is set. The warning time refers to the time from the predicted time of occurrence of a sag drop to the time of issuing a sag warning warning to be described later.
(1.3) Adjust the static sag occurrence warning area.
The operator refers to the average intrusion (approach) direction of the sag generation source and the transmission path of the sag occurrence factor such as the power transmission system by means not shown in the figure, and the shape and center of the static sag occurrence warning area. Adjust the points.
By the processes (1.1) to (1.3) described above, as shown in FIG. 6 (A), a static sag occurrence warning area b for the customer position a is set.

The warning issuing means 12 performs the following procedures (2.1) to (2.4) based on the data of the lightning pulse database 10 currently collected and stored when lightning is currently occurring. A low occurrence warning is issued (step S402).
(2.1) Calculate the current position of the instantaneous drop source.
Each data currently collected and stored from the lightning pulse database 10 is read out, and the current position of the instantaneous drop generation source is calculated from “time” data indicating the occurrence time of the lightning pulse. Specifically, as in the above (1.1), from the read data, the customer position near the current time is plotted to generate a polygon, the center of gravity is obtained, and the current position of the instantaneous drop source is determined. calculate. Note that the current position of the voltage sag source may be specified by receiving information of a position detected by a voltage sag generator not shown in the figure via a wireless channel such as the Internet or a satellite.
(2.2) Calculate the moving speed of the instantaneous drop source.
In the same manner as in (1.1) above, the position of the voltage source is obtained in time series, and the current movement speed of the voltage source is calculated.
(2.3) Calculate the traveling direction of the instantaneous drop source.
Similar to the above (1.1), the position of the voltage sag generation source is obtained in time series, and the current traveling direction of the voltage sag source is calculated.
(2.4) Issue a warning alert for the occurrence of a sag.
When lightning pulse data is received from the terminal device 3 in the static sag occurrence warning area set according to the above (1.1) to (1.3), or calculated according to the above (2.1) Estimate the position after a predetermined time from the current position of the sag occurrence source, and if it is predicted that the sag occurrence source will enter the static sag occurrence warning area after a predetermined time, An instruction is issued, and a command indicating that an instantaneous drop warning warning has been issued is transmitted to the terminal device 3 of the customer via the communication means 16 and the Internet 2. When the terminal device 3 receives the command for issuing a warning for occurrence of a sag and notifies the operator, the customer can recognize that the severance warning for occurrence of a sag has been issued, and the actual occurrence of a sag is generated. In order to prepare for this, the first instantaneous drop occurrence warning system can be entered.

  Here, the prediction that the sag occurrence source will enter the static sag occurrence warning area after a predetermined time is determined as follows. First, for a predetermined area including the current position of the voltage drop source calculated in (2.1) (this area is set based on the geographical condition that causes the movement of the voltage drop source). Data collected in the past from the lightning pulse database 10 is read for the customers in the area, and the moving speed and traveling direction (current vector of the instantaneous voltage source) of the instantaneous voltage source are determined. The moving speed can be calculated in the same manner as in the above (1.1) and (2.2), and the moving direction can be calculated in the same manner as in the above (2.3). Then, a plurality of vectors starting from the current position of the instantaneous drop generation source are generated. Based on the two vectors at the extreme ends of the plurality of vectors or one vector at one end, and the current vector calculated by the above (2.2) and (2.3), an instantaneous drop occurs after a predetermined time. The source position is estimated as a circle with center and radius. Let this circle be the forecast circle. For example, the center position in the forecast circle after a predetermined time may be obtained from the current vector, and the circle that touches the extension line of the two vectors at both ends may be estimated as the forecast circle. And when the forecast circle touches the static sag occurrence warning area set by (1.1) to (1.3), the sag occurrence source is within the static sag occurrence warning area after a predetermined time. Predict that it will invade.

Based on the data of the lightning pulse database 10 collected and stored in the past, the dynamic sag occurrence warning area setting means 13 performs the following steps (3.1) and (3.2) according to the following procedures (3) and (3). A dynamic sag occurrence warning area (second warning area) is set for each B (step S403).
(3.1) A dynamic sag occurrence warning area corresponding to the traveling direction of the sag occurrence source is set.
The operator manually sets a dynamic sag occurrence warning area by means not shown with reference to the moving speed calculated in the above (1.1) and a preset warning time. In this case, a plurality of dynamic sag occurrence warning areas are manually set in consideration of the wiring position of the power transmission system with respect to the power receiving facility of the customer.
(3.2) Adjust the dynamic sag occurrence warning area.
The operator refers to the moving speed of the sag generation source, the lead time for evacuation to an environment that is not affected by the sag due to lightning strikes, etc. Adjust the center point.
By the processes (3.1) and (3.2) described above, as shown in FIG. 6 (B), a dynamic sag occurrence warning area c for the customer position a is set.

The power transmission system detachment means 14 issues an instantaneous voltage drop alarm and causes the customer's power transmission system to be disconnected by the following processes (4.1) and (4.2) (step S404).
(4.1) An alarm for occurrence of instantaneous drop is issued.
When lightning pulse data is received from the terminal device 3 in the dynamic sag occurrence warning area set according to the above (3.1) and (3.2), or the moment calculated by the above (2.1) Estimate the position after a predetermined time from the current position of the low-occurrence source, and issue an instantaneous low-occurrence alarm when it is predicted that the instantaneous low-voltage source will enter the dynamic instantaneous voltage drop warning area after the predetermined time. . Prediction that the sag occurrence source will enter the dynamic sag occurrence warning area after a predetermined time is as described in (2.4) above. This is done in the same way as the prediction of intrusion.
(4.2) A save command is transmitted.
When an instantaneous drop occurrence warning is issued in accordance with the above (4.1), an evacuation command is transmitted to the customer's terminal device 3 via the communication means 16 and the Internet 2. With reference to FIG. 1, the terminal device 3 outputs a control signal to the generator 4 and activates the generator 4 when receiving a evacuation command from the voltage drop prediction device 1. In this case, the generator 4 supplies, to the important load 7, preset power having the same voltage and frequency as the commercial power. Thereby, it will be in the receiving power fixed operation state which the commercial power and the electric power by the generator 4 linked. Then, when a preset time elapses after entering the power receiving constant operation, the generator 4 supplies electric power according to the actual load of the important load 7. Thereby, it will be in the load isolation | separation driving | running state in which commercial electric power and the electric power by the generator 4 were connected. When the terminal device 3 receives a signal indicating that the load separation operation state has been entered from the generator 4, the terminal device 3 outputs a signal for turning the circuit breaker 6 to the ON state, which is the circuit breaker state, to the circuit breaker 6. Thereby, the important load 7 is in a self-sustaining operation state by the electric power from the generator 4. That is, even if a voltage drop due to a lightning strike or the like occurs in this state, the important load 7 is in a self-sustained operation state by the generator 4, and thus can be operated without being affected by the voltage drop. By this processing, the customer's important load 7 can be disconnected from the power transmission system from the electric power company, and can be evacuated to an environment that is not affected by a momentary voltage drop due to lightning.

The power transmission system restoration means 15 is used when the occurrence of a lightning pulse disappears from the dynamic sag occurrence warning area set by the dynamic sag occurrence warning area setting means 13 or in the dynamic sag occurrence warning area. If the predicted instantaneous drop source is removed, the customer's power transmission system is restored by the following processes (5.1) and (5.2) (step S405).
(5.1) Cancel the instantaneous drop alarm.
The lightning pulse data from the terminal device 3 in the dynamic sag occurrence warning area set by the above (3.1) (3.2) is stored for a preset time after the sag occurrence alarm is issued. If it is not received for a short time, or if it is determined that the predicted voltage sag occurrence source has escaped from the dynamic voltage sag occurrence warning area, the voltage sag occurrence alarm is canceled. It is determined in the same manner as (4.1) whether or not the predicted voltage sag occurrence source has escaped from the dynamic voltage sag occurrence warning area.
(5.2) Send a return command.
When the instantaneous drop occurrence alarm is canceled according to the above (5.1), a return command is transmitted to the terminal device 3 of the customer via the communication means 16 and the Internet 2. Referring to FIG. 1, when receiving a return command from the voltage sag prediction device 1, the terminal device 3 outputs a signal for setting the circuit breaker 6 to OFF, which is an energized state, to the circuit breaker 6. Thereby, the important load 7 is in a power receiving constant operation state in which commercial power and power generated by the generator 4 are linked. And a control signal is output to the generator 4 and the generator 4 is stopped. Thereby, the important load 7 becomes a commercial operation state by the electric power from the electric power company. That is, when the instantaneous drop occurrence alarm is canceled, the important load 7 is switched from the self-sustained operation state to the commercial operation state, and thus can be returned to the normal operation state.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the technical idea thereof. For example, in the above embodiment, the warning issuing means 12 of the voltage drop prediction device 1 transmits a command indicating that a voltage drop occurrence warning warning has been issued, the power transmission system disconnecting means 14 transmits a evacuation command, The system return means 15 transmits the return command so that the customer's device is remotely controlled automatically. However, the operator may transmit the command by telephone contact or the like and manually control the customer's device. Good.

  Moreover, in the said embodiment, although the instantaneous drop generation source was demonstrated as a thundercloud, it is not limited to this, For example, a typhoon and rain may be sufficient.

It is a block diagram which shows the whole structure of the instantaneous drop prediction system by embodiment of this invention. It is the outline of the power supply connection diagram in which a power failure detection sensor is installed. It is a block diagram which shows the function structure of the instantaneous drop prediction apparatus by embodiment of this invention. It is a flowchart figure which shows the process of the instantaneous drop prediction apparatus of FIG. It is a figure which shows the data structure of a lightning strike pulse database. It is a figure which shows a customer position, a static sag occurrence warning area, and a dynamic sag occurrence warning area.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Voltage drop prediction device 2 Internet 3 Terminal device 4 Generator 5 Voltage drop detection sensor 6 Circuit breaker 7 Critical load 8 General load 9 Power receiving equipment 10 Lightning pulse database 11 Static voltage drop occurrence warning area setting means 12 Alarm issuing means 13 Warning voltage setting warning area setting means 14 Transmission system disconnection means 15 Transmission system return means 16 Communication means 61, 68, 74 Breaker 51, 71 Current sensor 52 Zero phase voltage detector 63 Instrument transformer 64, 73 Disconnector 65 Partial discharge detection sensor 66 Lightning arrester 67 LA sensor 69 Energy meter 70 Overcurrent relay 72 Current transformer for auxiliary instrument 75 Current transformer for instrument 76 Phase advance capacitor 77 Transformer 78 Temperature sensor

Claims (6)

In the device that predicts the instantaneous drop of the target position caused by the instantaneous drop source,
Input information indicating that the voltage source is affected by the equipment from a plurality of positions including the target position, calculate the position of the voltage source based on the information, and set a warning area. Means,
When information indicating that the power source is affected by the instantaneous voltage drop is input from the facility in the alert area, the load operated by the commercial power of the predetermined power transmission system at the target position by other independent power A voltage sag prediction device comprising: means for transmitting a command for driving to the target position. In the device that predicts the instantaneous drop of the target position caused by the instantaneous drop source,
Information indicating that leakage current exceeding a preset threshold value has been input from facilities at a plurality of positions including the target position, and static sag generation based on the target position based on the information Static sag occurrence warning area setting means for setting a warning area;
When the information indicating that the leakage current has occurred is input from the equipment at the position in the static sag occurrence warning area, an alarm issuing means for transmitting a command to issue a sag occurrence warning alarm to the target position;
Information indicating that leakage current exceeding a preset threshold value has been input from facilities at a plurality of positions including the target position, and dynamic sag generation based on the target position based on the information Dynamic sag occurrence warning area setting means for setting a warning area;
When the information indicating that the leakage current has occurred is input from the equipment at the position in the dynamic voltage drop occurrence warning area, the load operated by the commercial power of the predetermined power transmission system is replaced by other independent power. A voltage sag prediction device comprising power transmission system disconnecting means for transmitting a command for operating to the target position. The instantaneous drop prediction device according to claim 2,
The power transmission system detaching means is further configured to input a sag occurrence source based on information indicating that a leakage current equal to or higher than a preset threshold value is input from equipment at a plurality of positions including the target position. A position is obtained, the position after a predetermined time is predicted, and when the predicted position exists in the dynamic voltage drop occurrence warning area, a load operated by commercial power of a predetermined power transmission system is A voltage sag prediction device, characterized in that a command for driving with independent power is transmitted to the target position. The instantaneous drop prediction device according to claim 2,
Furthermore, after inputting the information indicating that the leakage current has occurred from the equipment at the position in the dynamic voltage drop occurrence warning area, when the information is not input for a preset time, other independent power A voltage sag prediction device comprising: a power transmission system return means for transmitting a command for operating a load operated by a commercial power to the target position. The instantaneous drop prediction device according to claim 3,
Furthermore, after inputting information indicating that the leakage current has occurred from equipment at a position in the dynamic sag occurrence warning area, if the information is not input for a preset time, or the prediction When the position of the voltage sag occurrence source after a predetermined time exists within the dynamic voltage sag occurrence warning area and then the position is outside the dynamic voltage sag occurrence warning area, the vehicle is operated with other independent power. A voltage sag prediction device comprising power transmission system return means for transmitting a command for operating a load to be operated with commercial power to the target position. In a voltage sag prediction system comprising a plurality of positions including a target position where a voltage sag is predicted, and a voltage sag prediction device that predicts a voltage sag caused by a voltage sag source from information from the power facility. ,
A sensor for detecting the leakage current value and its direction, and a terminal for generating information indicating that a leakage current has been generated from the leakage current value and its direction detected by the sensor and transmitting the information to the instantaneous drop prediction device Equipment with equipment,
A voltage sag prediction system comprising the voltage sag prediction device according to claim 1.

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