JP5606298B2 - Accident point identification device for airport light power system and method for identifying the accident point - Google Patents

Description

  Embodiments described herein relate generally to an accident point identifying device and an accident point identifying method for an airport lighting power system.

  In airports, runway lights, taxiway lights, taxiway centerline lights, and many other types of lights are installed on runways and taxiways to guide aircraft safely.

  In these lamp power supply systems, the electric power output from the constant current power supply is sent to underground cables buried in the ground and supplied to each lamp through a light-compatible rubber transformer connected in series to the underground cable. Is done.

  The underground cable is covered with an insulating member around the conductor, and is insulated from the ground. However, when the insulation member deteriorates due to the influence of aging and the surrounding environment, and the insulation strength is greatly reduced, a ground fault is finally caused.

  Therefore, in the event of a ground fault in the airport lighting power system, it is necessary to take prompt recovery measures from the viewpoint of ensuring safe traveling of the aircraft.

  By the way, the power cable fault point identification device applied to a general power system (transmission / distribution system) connects a DC power source to each start end side of a ground fault cable conductor and a healthy cable conductor. Then, the end portions of the two cable conductors are connected by jumper wires. And the high voltage | pressure noise component contained in the ground voltages V1 and V2 which generate | occur | produce at each starting edge part side of both cable conductors is suppressed with a filter, and the ground voltages V1 and V2 after noise component suppression are measured. Subsequently, the polarity of the DC power supply is reversed, and the ground voltages V1 ′ and V2 ′ are similarly measured through the filter.

  Here, the ground fault position (%) is calculated as follows, where l is the length of the cable conductor and x is the distance from the start end (connection point) of the cable conductor connected to the DC power source to the ground fault point. It is obtained from the formula.

(X / l) = {2 (V1-V2 ') / (V1-V1' + V2'-V2)}. 100 (%)
...... (1)
Therefore, this fault point identifying device uses the fault cable conductor and the sound cable conductor provided side by side, simultaneously measures the ground voltage at two locations on the start side of each cable conductor, cancels the two ground voltages, In addition, measures are taken to suppress high-voltage induced noise from other underground cable conductors attached to both cable conductors by passing filters.

JP 2007-170905 A

Hiroyuki Yamada et al. Development of a new cable fault point measuring instrument. 14-13

  However, although a fault point identification device for a general power system has been implemented in the past, the airport lighting power supply system employs the following special system configuration and is therefore applied to a general power system. No accident point identification device is used.

(1) That is, in the airport light power system, as described above, the underground cable derived from the constant current power supply is arranged in a loop shape, and a number of rubber transformers corresponding to the number of group lights are connected in series to the underground cable. A lamp is connected to the secondary winding side of these rubber transformers via a slave station. That is, it has a special system configuration in which a large number of load devices are connected in series to a loop-shaped underground cable.

(2) In addition, the airport lamp power supply system performs dimming operation for each lamp according to the operation instructions of the controller. Specifically, the controller shall: (b) the operational direction at the time of landing of the aircraft; (b) the background brightness during daytime, dusk, nighttime; and (c) the cloud bottom height of 1000 m or more, for example. , (D) The power switch is controlled by operating the operation switch while judging the four conditions including low visibility (when visibility is poor at night, rain, heavy fog, etc.), and the brightness is optimal for the current environmental conditions. So that the lighting dimming operation.

  As a result, a large amount of distortion components are superimposed on the sine wave current waveform flowing from the constant current power source to the underground cable in accordance with the dimming operation.

(3) Furthermore, the number of lights installed at the airport varies from hundreds to tens of thousands, depending on the size of the airport. These lamps are grouped by type, even if they are the same type, and are grouped by a predetermined number. Underground cables belonging to many of these groups are installed in the ground, and power is supplied to rubber transformers that are connected in series to the cables in each location. Is supplied.

  Therefore, at the time of measurement for specifying the fault point of the cable due to the ground fault, there is a problem that the noise value induced from the underground cables of many other groups is received and the measurement value is affected.

  Therefore, in the past, when a ground fault occurred in an airport lighting power system, workers with experience and skill can replace the underground cables and install in the inspection manholes corresponding to the installation locations of cable connections. Attach the measurement clip of the measuring instrument that you entered and brought in to the cable connection, etc., perform the necessary measurements, and perform calculations to identify the ground fault position based on the measurement results. In this measurement work, while using a plurality of known measurement methods that can be known from the past, the measurement work is repeatedly performed by entering into a plurality of inspection manholes and performing calculations.

  As a result, the work until the ground fault position is specified is very complicated and takes a long time. In particular, in this ground fault identification work, after identifying the ground fault position, we go to the site to check the accident point, but because the ground fault position identification accuracy is low, the accident has occurred over a wide range including the ground fault position identified. The point must be confirmed. Furthermore, it is necessary to replace cables and rubber transformers as necessary.

  Moreover, these series of operations are performed in a state where the power source of the lamp is stopped, and thus it is necessary to quickly recover the operation. However, it is difficult to shorten the operation time, and the burden on the worker is great.

  In addition, as described in the above items (2) and (3), it is in a situation where it is easily affected by inductive noise due to a special power system configuration, and thus it is difficult to improve the accuracy of identifying the ground fault position. It is in.

  Therefore, the accident point identification device and the accident point identification method of this airport lighting power system reduce the burden on the worker, and reliably suppress the noise component peculiar to the system and improve the identification accuracy of the ground fault position. It is to carry out restoration work promptly.

According to the embodiment, a cable is disposed so as to form a loop on the output side of the AC power supply, and a lighting circuit unit including a plurality of lighting-related load devices is connected in series to the cable, and the lighting circuit including the cable When an accident occurs in the department, the accident point identification device of the airport lighting power system that identifies the accident point,
When the accident occurs, the cable is connected to both ends of the cable instead of the AC power supply, DC voltage applying means for applying a DC voltage to the lighting circuit section, and connected to both ends of the cable, and each cable is connected through the filter section. Voltage measuring means for measuring the ground voltage at the end, information storing means for storing attribute / circuit configuration information of the lighting circuit section including the cable, a plurality of ground voltages measured by the voltage measuring means and the information storing Accident position determination means for specifying the load equipment position that is an accident point using the attribute / circuit configuration information stored in the means, and the information storage means based on the load equipment position specified by the accident position determination means The accident point at the specified load device position existing in the circuit configuration image data constituting the lighting circuit unit including the cable obtained from the circuit configuration information stored in And an external output device for displaying by performing marking indicating,
The accident position determination means includes an addition distance (equipment position) and an addition distance from one end of the cable to each load device from the attribute / circuit configuration information of the lighting circuit portion including the cable stored in the information storage means. Equipment required information calculation means for sequentially calculating and storing the resistance, and after applying a DC voltage having a predetermined polarity and polarity reversed from the DC voltage application means, each ground voltage measured by the voltage measurement means and all of the load equipment Ground fault attribute value estimating means for estimating the number of load devices from one end of the cable to the fault point or the addition resistance using the number or at least the addition resistors of all load devices constituting the lighting circuit section; The number of load devices estimated by the ground fault attribute value estimation means or the addition resistance and the addition distance to each load device calculated by the device required information calculation means (device position) Or comparing the summing resistor, a configuration in which an earth絡機device position specifying means for specifying the load device position became fault point.

The block diagram which shows the accident point specific device of the airport lamp power supply system which concerns on Embodiment 1. FIG. The block diagram of the conventional general airport light power supply system. The figure which shows the apparatus (DC power supply, voltage measurement part) connected to the both ends of an underground cable when pinpointing a ground fault accident position. The functional block diagram which comprises the ground fault accident position determination part shown in FIG. The equivalent circuit diagram when the rubber transformer connected to the underground cable is replaced with a resistor. The figure explaining a series of processing procedures explaining the fault point identification method of the ground fault position determination part and airport lighting power supply system in Embodiment 1. FIG. FIG. 5 is a data array example diagram of a device management table created by the device required information calculation unit shown in FIG. 4. The figure which gave the marking which shows an accident point to the load equipment position used as an accident point. The figure which shows the shift | offset | difference range of the estimated position which changes according to an apparatus attachment position and ground fault resistance. The figure explaining a series of processing procedures explaining the fault point identification method of the ground fault accident position determination part and airport lighting power supply system in Embodiment 2. FIG. The block diagram which shows the accident point specific device of the airport lamp power supply system which concerns on Embodiment 3. FIG. The block diagram which shows the accident point specific device of the airport lamp power supply system which concerns on Embodiment 4. FIG.

Hereinafter, embodiments will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a block diagram showing Embodiment 1 of an accident point identifying device for an airport lighting power system.
The airport lighting power supply system includes a constant current power source 1 that supplies power at a constant current waveform to connection points 2 and 3 at all times, and an underground cable 4 that is connected to the connection points 2 and 3 in a loop. And a lighting circuit unit 5 connected in series to the underground cable 4 and an accident point specifying device 10.

  The constant current power source 1 generates an AC power source waveform having a required constant current from a commercial AC power source and supplies the waveform to the lighting circuit unit 5 through the connection points 2 and 3 and the underground cable 4.

  As shown in FIG. 2, the lighting circuit unit 5 is connected to the underground cable 4 in series with rubber transformers 6,... Corresponding to the number of group lamps. The lamp 7 is connected via a not-shown). That is, the lighting circuit unit 5 is connected to the underground cable 4 in series with a number of rubber transformers 6... And connected to the constant current power source 1 so as to form a loop.

  Here, the lights 7 are not only runway lights, taxiway lights, taxiway centerline lights, and many other types of lights that are installed on airport runways and taxiways, but also in the ground that forms a loop in the airport. When general lighting (such as lighting fixtures) is connected to the cable 4 in series, such lighting (such as lighting fixtures) is also included.

  The accident point identifying device 10 includes a DC power source 11, a polarity switching unit 12, a voltage measurement unit 13, a ground fault accident position determination unit 14, an information storage / storage unit 15, and an external output device 16.

  The DC power source 11 applies a DC voltage to the lighting circuit unit 5 connected to the underground cable 4 that is a target of occurrence of a ground fault or the like. The polarity switching unit 12 is provided on the output end side of the DC power supply 11 and has a function of inverting the polarity of the DC power supply 11 and applying it to the lighting circuit unit 5 when the ground fault position is specified.

  The voltage measuring unit 13 detects a terminal voltage of the lighting circuit unit 5 that is a target of occurrence of a ground fault or the like, and includes at least a filter unit 13-1 and a plurality of ground voltage measuring units 13 as shown in FIG. -2, 13-3 are included.

  The filter unit 13-1 suppresses an induced noise component included in the ground voltage appearing at each of the connection points 2 and 3, and the ground voltage from which the noise component has been removed is a plurality of ground voltage measuring units 13-2 and 13. -3. The ground voltage measuring units 13-2 and 13-3 measure the ground voltage appearing at the connection point 2 and the connection point 3, and send the measured value to the ground fault position determination unit 14. Specifically, the ground voltage measuring unit 13-2 measures the ground voltage V1 appearing at the connection point 2, and the ground voltage measuring unit 13-3 measures the ground voltage V2 appearing at the connection point 3, respectively. To the unit 14.

  The ground fault position determination unit 14 is information related to the lighting circuit unit 5 including the ground voltage received from each of the ground voltage measurement units 13-2 and 13-3 and the underground cable 4 stored in the information storage storage unit 15. That is, it has a function of specifying the position of the equipment (numbered rubber transformer) that is the ground fault point by using attribute data such as the number of rubber transformers 6,... And the resistance value.

  Functionally, the ground fault position determination unit 14 calculates equipment necessary information as shown in FIG. 4, for example, equipment necessary information calculating means for calculating DC resistance and distance (equipment position) to each equipment (for example, rubber transformer). 14A, the ground voltages V1, V2 measured by the ground voltage measuring units 13-2, 13-3, and the ground measured by the ground voltage measuring units 13-2, 13-3 after the polarity of the DC power supply 11 is inverted. A ground fault attribute value estimating means 14B for estimating attribute values such as the number of devices from the connection point 2 to the ground fault point and an added resistance using data such as voltages V1 'and V2', and a ground fault attribute value estimating means The ground fault equipment position specifying means 14C for specifying the equipment position close to the ground fault point from the attribute value estimated in 14B and the distance (position) to each equipment (for example, rubber transformer) obtained by the equipment required information calculation means 14A. It is the structure containing these.

  As shown in FIG. 6 described later, the information storage unit 15 includes a cable information storage unit 15a, a rubber transformer information storage unit 15b, and a circuit configuration information storage unit 15c.

  The cable information storage unit 15a stores at least line type data and resistance data per m or km of the line type. The rubber transformer information storage unit 15b stores at least a transformer type and resistance data. Not only one type but also a plurality of line types and transformer types, resistance data per km and resistance data of a rubber transformer are similarly stored.

  As the circuit configuration information storage unit 15c, circuit configuration element data for constructing the lighting circuit unit 5 including the underground cable 4 connected to the constant current power source 1, or frame image data, digital data and file format using a bitmap system In addition to the image file, data such as DC resistance and distance (position) to each device (for example, each rubber transformer) is stored.

  The external output device 16 outputs a specific position of the ground fault point to the outside, and includes a data processing unit 16-1 and a display unit 16-2.

  The data processing unit 16-1 reads information related to the lighting circuit unit 5 including the underground cable 4 stored in the circuit configuration information storage unit 15c, and includes a lighting circuit including the cable 4 that is a target of occurrence of a ground fault or the like. The circuit configuration image data corresponding to the unit 5 is generated, and the required graphic marking that is easy for the user to grasp is provided at the device specific position (location) specified by the ground fault position determination unit 14 in the image data. And process to indicate the location where the ground fault occurred.

  The display unit 16-2 displays the circuit configuration image data of the lighting circuit unit 5 subjected to the marking processed by the data processing unit 16-1.

  Next, the operation of the accident point identification device and the accident point identification method of the airport lighting power system configured as described above will be described with reference to the drawings.

  Now, in the airport lighting power supply system shown in FIG. 3, when the occurrence of a ground fault is detected from the lighting circuit section 5 by the operation of a protective relay or the like, the constant current power supply 1 is disconnected from the connection points 2 and 3.

  When the constant current power supply 1 is disconnected, the lamp power supply systems belonging to many other groups installed are in a live line state, and a number of other group cables 4 are controlled by the dimming operation of the lights by the controller. It is influenced by induction noise and causes an error.

  Therefore, instead of the constant current power source 1, the polarity switching unit 12 and the voltage measuring unit 13 constituting a part of the accident point identifying device 10 shown in FIG. Is applied to the lighting circuit unit 5 through the polarity switching unit 12, and the ground voltage V1, V2 appearing at both ends of the underground cable 4 connected to the lighting circuit unit 5 is measured by the voltage measuring unit 13 ( Measurement step).

  Here, in the voltage measuring unit 13, not only the ground voltages V1 and V2, but also a large amount of distortion components superimposed on the constant current waveform by the dimming operation by the controller, and other underground cables in the live line state attached together. It is measured in a state including an induction noise component from

  Therefore, the voltage measuring unit 13 is provided with a filter unit 13-1. This filter unit 13-1 has a relatively small change among a large amount of distortion component (a kind of induction noise) superimposed on a constant current waveform and an induction noise component entering from another underground cable in a live state. After removing the induced noise component, it is sent to the ground voltage measuring units 13-2 and 13-3.

  As a result, the ground voltage measuring units 13-2 and 13-3 measure the ground voltages V1 and V2 appearing at both ends of the cable 4 after removing the induction noise component having a relatively small change, and a ground fault occurs. It is temporarily stored in the position determination unit 14 or an appropriate buffer memory (not shown).

  Of the distortion component superimposed on the constant current waveform and the induction noise component entering from another underground cable in the live state, the noise component having a relatively large level change is expressed by the following equations (3) and (4). ), For example, V1−V2, the corresponding induced noise components cancel each other, and the generation of error factors can be suppressed.

  Subsequently, the switching instruction from the voltage measuring unit 13 or the polarity switching unit 12 is artificially switched, and a predetermined DC voltage whose polarity is inverted from the DC power supply 11 is applied to the lighting circuit unit 5. The ground voltages V1 ′ and V2 ′ after induction noise removal appearing at both terminals of the unit 5 are measured and stored in the ground fault position determination unit 14 or an appropriate buffer memory (not shown) (measurement step).

  Next, the identification of the ground fault point by the ground fault position determination unit 14 (accident position determination step) will be described with reference to FIGS. FIG. 5 is a diagram showing an equivalent circuit in which the rubber transformer 6 constituting the lighting circuit section 5 in the event of a ground fault is replaced with a resistor, where Rtr is the resistance value of one rubber transformer 6 and 8 is the ground value. A fault point, 9 indicates ground fault resistance.

  Prior to identifying the position of the ground fault accident, the ground fault position determination unit 14 executes the device necessary information calculation unit 14A. The equipment required information calculation unit 14A uses the information stored in the cable information storage unit 15a, the rubber transformer information storage unit 15b, and the circuit configuration information storage unit 15c constituting the information storage unit 15 to start the lighting circuit from the connection point 2. The DC resistance and the distance (device position) to each device (for example, each rubber transformer 6,...) Constituting the unit 5 are calculated (S1).

  Specifically, the device necessary information calculation unit 14A is connected to the device (rubber transformer 6) having the device number “1” at the arrangement position closest to the connection point 2, for example, from the circuit configuration information of the circuit configuration information storage unit 15c. Device number “1” from the length of the cable 4 connected to the device of the device number “1” from the connection point 2, the addition resistance (DC resistance) obtained by adding the resistance of the line type of the cable 4 and the resistance of the device ”Is calculated, and a device management table 15c1 as shown in FIG. 7 is created on the circuit configuration information storage unit 15c.

  That is, the device necessary information calculation unit 14A calculates the addition resistance from the connection point 2 to each device and the distance (device position) to each device, and the device number and device of each device obtained from the circuit configuration information storage unit 15c. Write in the device management table 15c1 in a state associated with the name.

  Subsequently, the ground fault position determination unit 14 executes the ground fault attribute value estimation unit 14B. The ground fault attribute value estimator 14B includes ground voltages V1 and V2 measured by the ground voltage measurement units 13-2 and 13-3 of the voltage measurement unit 13 and ground voltages V1 ′ and V2 obtained after polarity inversion. 'Or by reading the ground voltages V1 and V2 and the ground voltages V1' and V2 'stored in the appropriate storage means based on the measurement completion signal (S2), Estimate the number of devices up to the point of accident 8 (S3).

  Specifically, the resistance of the underground cable 4 from the connection point 2 to the connection point 3 and the total resistance of the rubber transformer 6,..., Rall, the total circuit resistance from the connection point 2 to the ground fault point 8 When the resistance obtained by adding all the resistances of the underground cable 4 and the rubber transformers 6 is Rx, between the ground voltage V1 at the connection point 2 and the ground voltage V2 at the connection point 3 is as follows. The relational expression is established.

V1 = (Rx / Rall). (V1-V2) (2)
V2 =-{(Rall-Rx) / Rall}. (V1-V2) (3)
Further, the following relational expression is established between the ground voltages V1 ′ and V2 ′ measured after the polarity of the DC power supply 11 is inverted.
V1 ′ = (Rx / Rall) · (V1′−V2 ′) (4)
V2 ′ = − (Rx / Rall) · (V1′−V2 ′) (5)
Therefore, the following relational expression (6) is derived from the expressions (2) and (4).
Rx (V1-V2) -V1.Rall = Rx (V1'-V2 ')-V1'.Rall
...... (6)
If this relational expression (6) is arranged for Rx, the following arithmetic expression can be derived between the resistance Rx from the connection point 2 to the ground fault point 8 and the total circuit resistance Rall.
Rx = {(V1−V1 ′) / (V1−V1′−V2 + V2 ′)} · Rall (7)
Here, in general, since the resistance of the rubber transformer 6 is the resistance of the underground cable 4, the resistance of the airport lighting power system is approximately equal to the total resistance of the rubber transformer 6. When the total number of rubber transformers 6 is Ntr and the number (attribute value) of the rubber transformers 6 from the connection point 2 to the ground fault point 8 is Nfl, the following equation is obtained.

Rall≈Rtr × Ntr (8)
Rx≈Rtr × Nfl (9)
Nfl = {(V1−V1 ′) / (V1−V1′−V2 + V2 ′)} · Ntr (10)
That is, from the ground voltages V1, V2, V1 ′, V2 ′ measured by the ground voltage measuring units 13-2, 13-3 and the total number Ntr of the rubber transformers 6 constituting the lighting circuit unit 5, formula (10) Accordingly, the number (ground fault attribute value) of the rubber transformer 6 from the connection point 2 to the ground fault point 8 can be obtained (S3).

  When estimating the ground fault attribute value by the ground fault attribute value estimating means 14B, for example, in the circuit configuration of FIG. 5, the cable 4 from the connection point 2 to the first rubber transformer 6 (1) is long, and the rubber transformer 6 Resistance >> The resistance relationship of the underground cable 4 may not hold.

  At this time, Rall is a circuit resistance obtained by adding all the resistances of the cable 4 from the connection point 2 to the connection point 3 and the resistances of the rubber transformers 6,..., And the cable from the connection point 2 to the first rubber transformer 6 (1). When the resistance is Rpri and the resistance of each rubber transformer 6 is Rtr, the above equation (10) can be expressed as the following equation (11).

Nfl = [{(V1−V1 ′) / (V1−V1′−V2 + V2 ′)} · Rall
−Rpri] ÷ Rtr (11)
Therefore, even when the cable 4 from the connection point 2 to the first rubber transformer 6 (1) is long, the number of the rubber transformers 6 from the connection point 2 to the ground fault point 8 is calculated using the equation (11). It can be obtained (S3).

  Next, after calculating the number Nfl of the rubber transformers 6 up to the ground fault point 8, the ground fault position determination unit 14 executes the ground fault device position specifying means 14C.

  The ground fault equipment position specifying means 14C compares the number Nfl of the rubber transformers 6 from the connection point 2 to the ground fault point 8 with the equipment number (rubber transformer number) stored in the equipment management table 15c1 (S4).

  Then, the Nfl-th device number from the connection point 2 corresponding to the number Nfl of rubber transformers 6 is specified from the device management table 15c1, and the device name and device position (distance to the device) corresponding to the device number are specified. (S5), sent to the data processing unit 16-1.

  Here, the data processing unit 16-1 includes, for example, the frame image data of the lighting circuit unit 5 to be generated such as a ground fault from the circuit configuration information storage unit 15c, or image file data converted into digital data by a bitmap method, Alternatively, circuit component data for constructing the lighting circuit unit 5 is taken out. In particular, in the case of circuit component data, circuit configuration image data of the lighting circuit unit 5 is created according to a predetermined editing procedure software.

  When the data processing unit 16-1 generates the circuit configuration image data (including the image file and the image file) and then receives the device name and the device position (distance) from the ground fault position determination unit 14, the circuit configuration image data Of the device images that are connected to the top, a required figure that makes it easy for the user to grasp the ground fault point, for example, marking data 21 with an X mark, is assigned to the device image portion corresponding to the device name and the corresponding device position (distance). Is displayed on the display unit 16-2 (accident point display step).

  FIG. 8 is a diagram illustrating a screen display example displayed on the display unit 16-2. That is, on the display screen, images of the rubber transformers 6 ′,... Constituting the lighting circuit unit 5 are arranged in a predetermined order on the cable line 4 ′ arranged in a loop shape, and the third rubber from the end is arranged. This indicates that a ground fault point exists at the position of the transformer 6 '. In addition, 22 represents the position shift range of the apparatus determined from the apparatus position and the ground fault resistance.

  Usually, the device position slightly deviates depending on the magnitude of the ground fault resistance 9 at the ground fault point 8 (see FIG. 9). Therefore, for example, marking data 21 with a cross is attached to the corresponding estimated device position (distance), and at the same time, the deviation range 22 of the ground fault point 8 is displayed on the display screen of the display unit 16-2 according to the estimated device position, for example. By clearly indicating it with a solid line frame, the confirmation range of the ground fault point can be clarified, and as a result, it is possible to quickly determine whether or not the device including the cable and the rubber transformer has been replaced.

  Therefore, according to the embodiment as described above, instead of the constant current power source 1, the direct current of the direct current power source 11 is replaced with the lighting circuit unit 5 connected to the underground cable 4 subject to occurrence of a ground fault or the like. A voltage is applied, and ground voltages V1, V2 and ground voltages V1 ', V2' after polarity inversion are taken out from both ends of the lighting circuit section 5 through the filter section 13-1. Of the induced noise components peculiar to the airport lighting power system, the relatively small induced noise component is suppressed by the filter unit 13-1, and the noise component accompanied by a relatively large level change is the difference between the ground voltages V1 and V2. By canceling each other, the influence of the induced noise component can be greatly reduced, and the accuracy in identifying the ground fault position can be increased.

  In addition, the conventional method for specifying the ground fault point 8 has roughly estimated the ground fault position by combining several conventionally known measurement methods. However, the resistance of the cable 4 and the rubber transformer 6 and the lighting circuit unit 5 Using the circuit configuration information, etc., the ground fault position where the ground fault point is the number of the rubber transformer 5 connected in series to the cable 4 as in the formula (10) and the formula (11), Since the marking 21 is added to and displayed on the equipment such as the rubber transformer 5 in the circuit configuration image data of the lighting circuit section 5, the worker can immediately recognize which equipment (location) the ground fault has occurred. In addition, the position of the equipment can be automatically identified according to a series of processing procedures, the burden on workers can be greatly reduced, accident points can be confirmed and equipment can be replaced easily from a highly accurate ground fault position, and in turn It is possible to proceed with recovery work That.

  In the above embodiment, for the sake of convenience, a ground fault has been described as an example of an accident in the lighting circuit unit 5 including the cable 4, but at the time of periodic inspection by an operator, for example, at a stage before the occurrence of the ground fault. At the time of an accident sign that a certain insulation resistance is greatly reduced, if the addition resistance from the connection point 2 to the part where the insulation resistance is greatly reduced is Rx, the dielectric strength of the lighting circuit section 5 including the cable 4 is reduced. The corresponding site can be easily identified.

(Embodiment 2)
FIG. 10 is a diagram for explaining an embodiment 2 of an accident point identifying device for an airport lighting power system.
In the second embodiment, a part of the ground fault attribute value estimation unit 14B and the ground fault device position specifying unit 14C is changed in the ground fault position determination unit 14 that specifies the ground fault device position. is there.

  That is, the ground fault attribute value estimation means 14B of the first embodiment uses the ground voltages V1, V2, V1 ′, V2 ′ as shown in FIG. 6 and starts from the connection point 2 according to the equations (10) and (11). Although the number Nfl of rubber transformers 6 up to the ground fault point 8 is calculated (S3), the ground fault attribute value estimating means 14B of the second embodiment is connected not as the number Nfl of rubber transformers 6 but as shown in FIG. The addition resistance (total resistance) Rx of the underground cable 4 and the rubber transformer 6 from the point 2 to the ground fault point 8 is calculated (S3 ′).

  After calculating the addition resistance (total resistance) Rx up to the ground fault point 8 as described above, the ground fault position determination unit 14 executes the ground fault device position specifying unit 14C.

  In the ground fault equipment position specifying means 14C, the addition resistance (attribute value) Rx from the connection point 2 to the ground fault point 8 and the addition resistance from the connection point 2 to each equipment stored in the equipment management table 15c1 shown in FIG. And the addition resistance closest to Rx is estimated (S4 ′).

  Based on the device number associated with the estimated addition resistance, the device name and ground fault device position (distance) corresponding to the device number are identified from the device management table 15c1 (S5), and the data processing unit 16- 1 to send. When the data processing unit 16-1 receives at least ground fault device position (distance) data from the ground fault position determination unit 14, the data processing unit 16-1 continues on the circuit configuration image data representing the configuration of the lighting circuit unit 5 including the underground cable 4. Among the device images, a predetermined figure that is easily grasped as a ground fault point, for example, marking data 21 with an X mark, is assigned to the device image corresponding to the corresponding device position (distance) and displayed on the display unit 16-2.

  Therefore, according to the second embodiment, the same effects as those of the first embodiment can be obtained.

(Embodiment 3)
FIG. 11 is a block diagram showing Embodiment 3 of the accident point identifying device for an airport lighting power system. The difference between FIG. 11 and FIG. 1 is that between the ground fault position determination unit 14 and the information storage storage unit 15. The information selection unit 31 is newly added. Since other configurations are the same as those in FIG. 1, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted.

  As described above, this airport lamp power supply system is grouped into predetermined groups for each type of lamp, even for the same type of lamp, and underground cables 4 for each group are attached to the ground. A number of rubber transformers 6 are connected to the cable 4 in series.

  Therefore, the information storage storage unit 15 includes attribute / configuration circuit information related to the lighting circuit unit 5 including a plurality of cables 4 in association with each group number or a predetermined identification number (such as a type of lighting and an installation location / area). Is saved.

  Therefore, in the airport lighting power supply system according to the present embodiment, when an information selection unit 31 is newly provided and a ground fault occurs in the lighting circuit unit 5 including a certain cable 4, the occurrence of the ground fault from the information storage storage unit 15 occurs. Select the group number of the lighting circuit section 5 including the target underground cable 4, select the attribute / circuit configuration information belonging to the lighting circuit section 5 including the corresponding underground cable, and identify the ground fault location Therefore, it is provided to the subsequent ground fault position determination unit 14 and the data processing unit 16-1.

  The information selection unit 31 includes at least one rotary switch that is manually selected, a push button switch corresponding to the number of groups, or a keyboard and display screen when a personal computer is used for the accident point identification device 10. When a group number is displayed on the menu, a pointing device for selecting the group number is used.

  Therefore, according to the embodiment as described above, even when there are a plurality of lighting circuit parts 5 including the cable 4 for specifying the accident point, one cable 4 that is actually in a ground fault or a sign of an accident is connected. The attribute / circuit configuration information belonging to the included lighting circuit unit 5 can be selected to identify the ground fault device position.

(Embodiment 4)
FIG. 12 is a block diagram showing Embodiment 4 of the accident point identifying device of the airport lighting power system.
In the fourth embodiment, what is particularly different from FIG. 11 is a configuration in which a circuit switching selection unit 32 and circuit switching units 33-1, 33-2, 33-3,.

  Therefore, since the other structure is the same as that of FIG. 1, FIG. 11, the same code | symbol is attached | subjected to the same part and the detailed description is abbreviate | omitted.

  The circuit switching selection unit 32 sends a switching command to the circuit switching unit 33-1 connected to the lighting circuit unit including the cable 4 in which the ground fault has occurred, for example, 5-1, The switches described in the information selection unit 31 are used.

  The circuit switching units 32-1, 32-2, 32-3,... Are connected to the lighting circuit units 5-1, 5-2,. When the circuit switching unit 32-1 receives a switching command from the circuit switching selection unit 32, for example, instead of the constant current power source 1-1, both ends (connection points 2 and 3) of the cable 4 are provided. The DC power supply 11 and the voltage measuring unit 13 are connected, and a predetermined DC voltage is applied to both ends of the cable 4 to prepare for the measurement of the ground voltage necessary for identifying the ground fault point. That is, a predetermined DC voltage is applied to both ends of the cable 4 and the ground voltage appearing at both ends of the cable 4 is measured by the voltage measuring unit 13.

  On the other hand, the information selection unit 31 recognizes which lighting circuit unit including, for example, 5-1 is selected from the switch signal sent from the circuit switching selection unit 32, and the corresponding cable from the information storage storage unit 15. Is selected, and the attribute / circuit configuration information belonging to 5-1, for example, is selected and provided to the ground fault position determination unit 14 and the data processing unit 16-1.

  Therefore, according to the above embodiment, for example, from among the lighting circuit units 5-1 to 5-4 including the four cables 4, the lighting circuit unit 5-1 including the cable 4 in which the ground fault has occurred is changed. Sends a switching command to the corresponding circuit switching unit 33-1, and prepares for measurement to automatically identify the position of the ground fault, so it is not necessary to go to the work site and change the circuit. The burden on personnel can be greatly reduced, the location of the ground fault can be quickly identified, and the restoration work can be proceeded quickly.

(Other embodiments)
(1) In the above embodiment, the example of the lamp 7 connected to each of the rubber transformers 6 is described. However, the present invention is similarly applied to a lamp power supply system that uses, for example, an LED lamp without using the rubber transformer 6. it can. That is, if a plurality of LED lamps are connected in series to the cable 4 arranged in a loop and the resistance (impedance) of each rubber transformer 6 described above is replaced with the resistance (impedance) of each LED lamp, the ground fault device is easily obtained. (LED lighting) The position can be specified.

(2) The airport lighting power system is not limited to the lighting 7 installed at the airport, but also includes a power system in which general lighting is connected in series to a looped cable. Applicable.

(3) In the fourth embodiment, the four lighting circuit units 5-1 to 5-4 have been described as examples of the lighting circuit unit to be processed, but the number of lighting circuit units is not limited, By providing a circuit switching unit for each lighting circuit unit, any number of lighting circuit units can be accommodated.

(4) Moreover, although the several rubber transformer 6 connected in series with the underground cable 4 was demonstrated in the said embodiment, it is laid, for example in the groove | channel with a lid with a concave cross section etc., for example, without being embedded in the ground. A configuration in which a plurality of rubber transformers 6 are connected in series to a cable can be similarly applied.

(5) The above embodiment is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  1, 1-1, 1-2, ... constant current power supply, 2, 3 ... connection point, 4 ... underground cable, 5,5-1, 5-2, ... lighting circuit, 6, 6 (1 ) ... Rubber transformer, 7 ... Light, 8 ... Ground fault point, 10 ... Accident point identification device, 11 ... DC power source, 12 ... Polarity switching unit, 13 ... Voltage measurement unit, 13-1 ... Filter unit, 13-2 , 13-3 ... Ground voltage measurement unit, 14 ... Ground fault accident position determination unit, 14A ... Equipment required information calculation means, 14B ... Ground fault attribute value estimation means, 14C ... Ground fault equipment position specification means, 15 ... Information storage storage 16, external output device, 16-1 data processing unit, 16-2 display unit, 31 information selection unit, 32 circuit switching selection unit, 33-1, 33-2, circuit switching unit.

Claims (8)

A cable is arranged so as to form a loop on the output side of the AC power supply, and a lighting circuit unit including a plurality of load devices related to lighting is connected in series to the cable, and an accident occurs in the lighting circuit unit including the cable. When it is an accident point identification device of an airport lighting power system that identifies the accident point,
DC voltage application means that is connected to both ends of the cable instead of the AC power supply when the accident occurs, and that applies a DC voltage to the lighting circuit section,
Voltage measuring means connected to both ends of the cable and measuring the ground voltage at each end of the cable through the filter section;
Information storage means for storing the attribute / circuit configuration information of the lighting circuit unit including the cable,
Accident position determination means for identifying the load device position that is the accident point using a plurality of ground voltages measured by the voltage measurement means and the attribute / circuit configuration information stored in the information storage means,
Based on the load device position specified by the accident position determination means, the specified information existing in the circuit configuration image data constituting the lighting circuit unit including the cable obtained from the circuit configuration information stored in the information storage means. With an external output device that displays markings indicating the accident point at the load equipment position ,
The accident position determination means includes
From the attribute / circuit configuration information of the lighting circuit unit including the cable stored in the information storage unit, the addition distance (device position) and the addition resistance from one end of the cable to each load device are sequentially calculated and stored. Device required information calculation means,
After application of a DC voltage having a predetermined polarity and polarity reversed from the DC voltage application means, each ground voltage measured by the voltage measurement means and the total number of the load equipment or at least all of the load equipment constituting the lighting circuit section A ground fault attribute value estimating means for estimating the number of load devices from the one end of the cable to the accident point or the addition resistance using an addition resistor,
The number of load devices estimated by the ground fault attribute value estimating means or the added resistance is compared with the added distance (equipment position) or added resistance to each load device calculated by the required device information calculating means. fault point identifying device of airports lighting power supply system provided with a <br/> earth絡機device position specifying means for specifying the load device position becomes the point. The accident occurring in the lighting circuit section including the cable includes at least a ground fault accident and an accident sign that the insulation resistance of the cable at a stage before the ground fault occurs is equal to or less than a predetermined value. Item 2. Accident point identification device for airport lighting power system according to item 1. In the accident point identifying device for an airport light power supply system according to any one of claims 1 and 2,
From the attribute / circuit configuration information of the lighting circuit unit including a plurality of cables stored in the information storage means, select the attribute / circuit configuration information about the lighting circuit unit including the cable for specifying the accident point, An accident point identifying device for an airport lighting power system, further comprising an accident position determination means and an information selection means provided to the external output device. A cable is arranged so as to form a loop on the output side of the AC power supply, and a lighting circuit unit including a plurality of load devices related to lighting is connected in series to the cable, and an accident occurs in the lighting circuit unit including the cable. When it is an accident point identification device of an airport lighting power system that identifies the accident point,
DC voltage application means that is connected to both ends of the cable instead of the AC power supply when the accident occurs, and that applies a DC voltage to the lighting circuit section,
Voltage measuring means connected to both ends of the cable and measuring the ground voltage at each end of the cable through the filter section;
Information storage means for storing the attribute / circuit configuration information of the lighting circuit unit including the cable,
Accident position determination means for identifying the load device position that is the accident point using a plurality of ground voltages measured by the voltage measurement means and the attribute / circuit configuration information stored in the information storage means,
Based on the load device position specified by the accident position determination means, the specified information existing in the circuit configuration image data constituting the lighting circuit unit including the cable obtained from the circuit configuration information stored in the information storage means. An external output device that displays markings indicating the accident point at the load equipment position;
A circuit switching selection means for outputting a switching command for selecting the lighting circuit unit including the cable in which the accident has occurred, among the lighting circuit units including a plurality of cables;
Each of the lighting circuit units is connected to both ends of the cable, and when receiving a switching command from the circuit switching selection means, the direct current is connected to the lighting circuit unit including a cable for specifying the fault point instead of the AC power source. Circuit switching means for applying a DC voltage from the voltage applying means and connecting the voltage measuring means to both ends of the cable;
In order to identify the accident point from the attribute / circuit configuration information of the lighting circuit unit including a plurality of cables stored in the information storage unit when receiving the switching command related to circuit selection from the circuit switching selection unit An information selection means for recognizing the lighting circuit section including the cable, selecting attribute / circuit configuration information relating to the lighting circuit section including the cable, and providing the accident position determination means and the external output device;
Airport light power system accident point identification device equipped with . The accident occurring in the lighting circuit section including the cable includes at least a ground fault accident and an accident sign that the insulation resistance of the cable at a stage before the ground fault occurs is equal to or less than a predetermined value. Item 5. Accident point identifying device for airport lighting power system according to item 4 . In the accident point identifying device for an airport light power supply system according to any one of claims 4 and 5,
The accident position determination means includes
From the attribute / circuit configuration information of the lighting circuit unit including the cable stored in the information storage unit, the addition distance (device position) and the addition resistance from one end of the cable to each load device are sequentially calculated and stored. Device required information calculation means,
After application of a DC voltage having a predetermined polarity and polarity reversed from the DC voltage application means, each ground voltage measured by the voltage measurement means and the total number of the load equipment or at least all of the load equipment constituting the lighting circuit section A ground fault attribute value estimating means for estimating the number of load devices from the one end of the cable to the accident point or the addition resistance using an addition resistor,
The number of load devices estimated by the ground fault attribute value estimating means or the added resistance is compared with the added distance (equipment position) or added resistance to each load device calculated by the required device information calculating means. A ground fault device position specifying means for specifying the load device position which is a point;
Airport light power system accident point identification device equipped with . A cable is arranged so as to form a loop on the output side of the AC power supply, and a lighting circuit unit including a plurality of load devices related to lighting is connected in series to the cable, and an accident occurs in the lighting circuit unit including the cable. The accident point identification applied to the accident point identification device of the airport lighting power system to identify the accident point,
In the event of the accident, instead of the AC power supply, connected to both ends of the cable, a process of applying a DC voltage to the lighting circuit unit,
A process of measuring the ground voltage at each end of the cable connected to both ends of the cable and through the filter section;
Processing to store the attribute / circuit configuration information of the lighting circuit section including the cable;
Using the measured ground voltage and the stored attribute / circuit configuration information, an accident position determination process that identifies the load device position that is an accident point;
Based on the load device position specified in the accident position determination process, the specified load device position present in the circuit configuration image data constituting the lighting circuit unit including the cable obtained from the stored circuit configuration information. Execute the process of marking and displaying the accident point,
The accident position determination process
From the attribute / circuit configuration information of the lighting circuit unit including the stored cable, the additional distance (device position) and the additional resistance from one end of the cable to each load device are sequentially calculated and stored,
After the application of the DC voltage having a predetermined polarity and the polarity reversed, the cable is measured using the measured ground voltages and the total number of the load devices or at least the addition resistors of all the load devices constituting the lighting circuit unit. Estimate the number or load resistance of the load equipment from one end of the to the accident point,
The accident point that identifies the load device position that is the accident point by comparing the estimated number or load resistance of the load devices with the calculated addition distance (device position) or addition resistance to each load device Identification method . A cable is arranged so as to form a loop on the output side of the AC power supply, and a lighting circuit unit including a plurality of load devices related to lighting is connected in series to the cable, and an accident occurs in the lighting circuit unit including the cable. The accident point identification applied to the accident point identification device of the airport lighting power system to identify the accident point,
In the event of the accident, instead of the AC power supply, connected to both ends of the cable, a process of applying a DC voltage to the lighting circuit unit,
A process of measuring the ground voltage at each end of the cable connected to both ends of the cable and through the filter section;
Processing to store the attribute / circuit configuration information of the lighting circuit section including the cable;
Using the measured plurality of ground voltages and the stored attribute / circuit configuration information, a process of identifying the load device position that is an accident point;
Marking indicating an accident point at the specified load device position existing in the circuit configuration image data constituting the lighting circuit unit including the cable obtained from the stored circuit configuration information based on the specified load device position Processing to display and
A process of outputting a switching command for selecting a lighting circuit unit including the cable in which an accident has occurred among lighting circuit units including a plurality of cables;
When connected to both ends of the cable of each lighting circuit section and receiving the switching command, the DC voltage is applied to the lighting circuit section including a cable for specifying the fault point instead of the AC power supply, And the process of performing circuit switching so as to measure the ground voltage at both ends of the cable,
When the switching command is received, the lighting circuit unit including the cable for identifying the accident point is recognized from the attribute / circuit configuration information of the lighting circuit unit including the plurality of stored cables, and the cable Processing to select and provide attribute / circuit configuration information related to lighting circuit parts including
Accident point identification method to carry out .

Images