JP2014112498A - Dc resistance measurement system for light source circuit, measurement device, and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain DC resistance distribution with accuracy even when there is a difference between a resistance value of a registered device and an actual resistance value.SOLUTION: In a light circuit resistance measurement system, a DC resistance calculation device 10 is connected to a light circuit part 14. The DC resistance calculation device 10 comprises a DC resistance calculation unit 1a, a DC resistance meter 2, a DC power supply 3, voltage meters 4a and 4b, a device changeover unit 5, and switches S1-S6. The DC resistance calculation unit 1a includes: a DC resistance measurement unit 6 obtaining information on a DC resistance from the DC resistance meter 2; a voltage measurement unit 7 obtaining voltages VA and VB from the voltage meters 4a and 4b; a switch changeover unit 8 generating a changeover command to the switches S1-S6 and the device changeover unit 5 to change over the switches; and a resistance calculation unit 9 calculating the DC resistance of the circuit from a resistance value of the circuit, a voltage value, and a state of the switches.

Description

  Embodiments described herein relate generally to a system, a measuring apparatus, and a measuring method for measuring a DC resistance of a light source circuit such as a lamp or a light connected in a loop.

  At the airport, lights for aircraft guidance are installed around the runway. In general, these lamps are supplied with electric power from a power source via cables embedded in the ground.

FIG. 11 shows a configuration of a conventional lighting circuit DC resistance measurement system (hereinafter referred to as a “light circuit resistance measurement system”) used in airports.
In this lighting circuit resistance measurement system 100, a plurality of lighting parts 11 are connected to cables 13 embedded in the ground via rubber transformers 12, respectively, and a circuit is formed in a loop shape by the cables 13 so that the lighting circuit parts 14 are connected. It is composed. The lighting circuit unit 14 is connected to a constant current power supply 15 via a cable 13.

  In addition, a manhole is provided at a connection point between the rubber transformer 12 and the cable 13 so that a maintenance person can access it. The distance of the cable 13 between the two rubber transformers 12 and 12 is set to about 30 to 100 m.

  In the lighting circuit resistance measurement system 100, since the circuit configuration is a loop, the DC resistance of the entire circuit can be measured by measuring the DC resistance at both ends of the cable 13 connected to the constant current power supply 15.

JP 2011-142026 A

  The resistance distribution of the lighting circuit resistance measurement system 100 can be calculated from the DC resistance of the rubber transformer 12 used in the lighting section 11, and the length and resistance (Ω / km) of the cable 13 estimated from the construction drawing.

  However, the cable 13 is generally laid with a margin in consideration of handling and the like. In addition, there may be a difference between the drawings and the actual laying situation due to factors such as connection changes and errors. For this reason, a difference may occur between the calculated resistance value and the actual resistance value.

  In addition, since the rubber transformer 12 is often installed in an underground manhole, the laying status can be confirmed from the manhole, but the cable 13 connecting the rubber transformer 12 is a long distance and underground type, Investigation takes time and effort.

  Embodiments of the present invention provide a direct current resistance measurement system, a measurement apparatus, and a measurement method for a light source circuit that can accurately obtain a direct current resistance distribution even if there is a difference between a resistance value of a registered device and an actual resistance value. The purpose is to provide.

  In order to achieve the above object, a direct current resistance measurement system for a light source circuit according to an embodiment of the present invention includes a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, and a resistance of the entire light source circuit. DC resistance measuring instrument for measuring, DC power supply for applying a DC voltage to the light source circuit, voltage measuring instrument for detecting the terminal voltage of the connected DC power supply and the light source circuit, the light source circuit and the DC resistance measuring instrument Or a device switching unit that switches connection between the light source circuit and the DC power source, a plurality of switches connected to an arbitrary location of the light source circuit, and a DC resistance calculation unit for calculating the DC resistance of the light source circuit. The DC resistance calculation unit includes a DC resistance measurement unit that obtains a DC resistance value of the entire light source circuit from the DC resistance measuring instrument, and a DC voltage is applied to the light source circuit from the DC power source. A voltage measuring unit that obtains a voltage value of a part of the light source circuit connected by the switch from the voltage measuring instrument, a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and the A resistance calculation unit that calculates a DC resistance of the light source circuit from a voltage value of a DC power supply.

  In addition, the direct current resistance measurement system for the light source circuit according to the embodiment of the present invention includes a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, and a direct current resistance measurement device that measures the resistance of the entire light source circuit. A DC power source that applies a DC voltage to the light source circuit, a device switching unit that switches connection to the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source, an arbitrary portion of the light source circuit, and the A voltage measuring instrument connected to a DC power source; and a DC resistance calculating unit for calculating a DC resistance of the light source circuit, wherein the DC resistance calculating unit is connected to the entire light source circuit from the DC resistance measuring instrument. A DC resistance measuring unit for obtaining a DC resistance value, a voltage measuring unit for obtaining a voltage value of a part of the light source circuit from the voltage measuring instrument when a DC voltage is applied to the circuit from the DC power source, and the light source. DC resistance of the entire road, characterized in that it comprises a voltage value of a portion of the light source circuit, and a resistance calculation unit for calculating a DC resistance of the light source circuit from the voltage value of the DC power supply.

  Furthermore, the direct current resistance measurement system for the light source circuit according to the embodiment of the present invention includes a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, a direct current power source that applies a direct current voltage to the light source circuit, A device switching unit that switches connection between the light source circuit and the DC power source, a power meter connected to an arbitrary location of the light source circuit, and a current that is connected to the DC power source and measures the current value of the entire light source circuit A measuring instrument; and a DC resistance calculating unit for calculating a DC current of the light source circuit, wherein the DC resistance calculating unit obtains a DC current value of the entire light source circuit from the DC current measuring instrument. A power measurement unit that obtains a power value of a part of the light source circuit from the power meter when a direct current voltage is applied to the light source circuit from the direct current power source, a direct current value of the entire light source circuit, Power value of a portion of the light source circuit, and characterized in that it and a resistance calculation unit for calculating a DC resistance of the light source circuit from the voltage value of the DC power supply.

  In order to achieve the above-described object, a DC resistance measurement apparatus for a light source circuit according to an embodiment of the present invention measures a resistance of an entire light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape. A DC power source for applying a DC voltage to the light source circuit, a voltage measuring device for detecting a terminal voltage of the connected DC power source and the light source circuit, the light source circuit and the DC resistance measuring device or the light source circuit, A device switching unit for switching the connection to the DC power source, a plurality of switches connected to any part of the light source circuit, and a DC resistance calculation unit for calculating the DC resistance of the light source circuit, The DC resistance calculation unit includes a DC resistance measurement unit that obtains a DC resistance value of the entire light source circuit from the DC resistance measurement device, and a DC voltage applied to the light source circuit from the DC power source. A voltage measuring unit that obtains a voltage value of a part of the light source circuit connected from the voltage measuring instrument, a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power source. A resistance calculation unit that calculates a DC resistance of the light source circuit.

  In addition, a direct current resistance measuring device for a light source circuit according to an embodiment of the present invention includes a direct current resistance measuring instrument that measures the resistance of an entire light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, and the light source circuit. A DC power source for applying a DC voltage to the light source circuit, the light source circuit and the DC resistance measuring instrument, or a device switching unit for switching the connection between the light source circuit and the DC power source, an arbitrary portion of the light source circuit and the DC power source. And a DC resistance calculation unit for calculating a DC resistance of the light source circuit, and the DC resistance calculation unit obtains a DC resistance value of the entire light source circuit from the DC resistance measurement device. A direct current resistance measurement unit; a direct current voltage applied to the circuit from the direct current power source; a voltage measurement unit that obtains a voltage value of a part of the light source circuit from the voltage meter; and a direct current resistance value of the entire light source circuit Voltage value of a portion of the light source circuit, and characterized in that it and a resistance calculation unit for calculating a DC resistance of the light source circuit from the voltage value of the DC power supply.

  Furthermore, the direct current resistance measurement apparatus for a light source circuit according to an embodiment of the present invention includes a direct current power source that applies direct current voltage to a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, the light source circuit, and the light source circuit A device switching unit that switches connection to a DC power source, a power measuring instrument connected to an arbitrary portion of the light source circuit, a current measuring instrument connected to the DC power source to measure a current value of the entire light source circuit, and A DC resistance calculation unit for calculating a DC current of the light source circuit, wherein the DC resistance calculation unit obtains a DC current value of the entire light source circuit from the DC current measuring instrument, and the DC When a DC voltage is applied from the power source to the light source circuit, a power measuring unit that obtains a power value of a part of the light source circuit from the power meter, a direct current value of the whole light source circuit, a part of the light source circuit Force value, and characterized in that it and a resistance calculation unit for calculating a DC resistance of the light source circuit from the voltage value of the DC power supply.

  In order to achieve the above object, a direct current resistance measurement method for a light source circuit according to an embodiment of the present invention is a direct current resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, A DC resistance measuring instrument for measuring the resistance of the entire light source circuit; a DC power supply for applying a DC voltage to the light source circuit; a voltage measuring instrument for detecting a terminal voltage of the connected DC power supply and the light source circuit; and the light source. A circuit switching unit for switching connection between the circuit and the DC resistance measuring instrument or the light source circuit and the DC power source, a plurality of switches connected to arbitrary locations of the light source circuit, and a DC resistance of the light source circuit A direct current resistance calculation step for obtaining a direct current resistance value of the entire light source circuit from the direct current resistance measuring instrument, applying a direct current voltage to the light source circuit from the direct current power source, A voltage measuring step of obtaining a voltage value of a part of the light source circuit connected by a closure from the voltage measuring instrument, a direct current resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage of the direct current power source And a resistance calculating step of calculating a direct current resistance of the light source circuit from the value.

  Also, a DC resistance measurement method for a light source circuit according to an embodiment of the present invention is a DC resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape. A DC resistance measuring instrument that measures DC power, a DC power source that applies a DC voltage to the light source circuit, a device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source, and the light source. Using a voltage measuring instrument connected to an arbitrary part of the circuit and the DC power source, and a DC resistance calculating unit for calculating the DC resistance of the light source circuit, the DC resistance of the entire light source circuit from the DC resistance measuring instrument. A DC resistance measuring step for obtaining a resistance value, a voltage measuring step for applying a DC voltage from the DC power source to the light source circuit, and obtaining a voltage value for a part of the light source circuit from the voltage measuring device, and the light source circuit Overall DC resistance, the voltage value of a portion of the light source circuit, and characterized by having a, a resistance calculation step of calculating a direct current resistance of the light source circuit from the voltage value of the DC power supply.

  Furthermore, a DC resistance measurement method for a light source circuit according to an embodiment of the present invention is a DC resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape, and a DC voltage is applied to the light source circuit. A DC power source for applying power, a device switching unit for switching connection between the light source circuit and the DC power source, a power meter connected to an arbitrary location of the light source circuit, and the entire light source circuit connected to the DC power source A current measuring step of obtaining a direct current value of the entire light source circuit from the direct current measuring instrument using a current measuring instrument for measuring the current value of the light source circuit and a direct current resistance calculating unit for calculating the direct current of the light source circuit A power measuring step of applying a DC voltage from the DC power source to the light source circuit to obtain a power value of a part of the light source circuit from the power meter, a DC current value of the entire light source circuit, and the light source circuit A portion of the power values, and characterized by having a, a resistance calculation step of calculating a direct current resistance of the light source circuit from the voltage value of the DC power supply.

It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the process sequence of the direct current | flow resistance calculation apparatus which concerns on 1st Embodiment. It is a flowchart which shows the process sequence of the direct current | flow resistance calculation apparatus which concerns on 2nd Embodiment. It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 3rd Embodiment of this invention. It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 4th Embodiment of this invention. It is a flowchart which shows the process sequence of the direct current | flow resistance calculation apparatus which concerns on 4th Embodiment. It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 5th Embodiment of this invention. It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 6th Embodiment of this invention. It is a flowchart which shows the process sequence of the direct current | flow resistance calculation apparatus which concerns on 6th Embodiment. It is the schematic which shows the whole structure of the lighting circuit resistance measuring system which concerns on the 7th Embodiment of this invention. It is the schematic which shows the whole structure of the conventional lighting circuit resistance measuring system of an airport.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
(overall structure)
FIG. 1 shows an overall configuration of a direct current resistance measurement system for a lighting circuit according to a first embodiment of the present invention (hereinafter referred to as “lighting circuit resistance measurement system”).

  The lighting circuit resistance measurement system according to the present embodiment is configured by connecting a DC resistance calculation device 10 to a lighting circuit unit 14 having the structure shown in FIG.

(DC resistance calculation device 10)
The DC resistance calculation device 10 includes a DC resistance calculation unit 1a for calculating DC resistance, a DC resistance meter 2 for measuring the resistance of the lighting circuit unit 14, and a DC power source 3 for applying a DC voltage to the lighting circuit unit 14. , Voltmeters 4a and 4b for detecting the terminal voltage of the connected DC power supply 3 and the lighting circuit unit 14, the device switching unit 5 for switching the connection between the lighting circuit unit 14 and the device, and the connection between the lighting circuit unit 14 and the ground Switches S1 to S6.

(DC resistance calculation unit 1a)
The DC resistance calculation unit 1a includes a DC resistance measurement unit 6 that obtains DC resistance information from the DC resistance meter 2, a voltage measurement unit 7 that obtains voltages VA and VB from the voltmeters 4a and 4b, switches S1 to S6, and device switching. A switch switching unit 8 that issues a switching command to the unit 5 to switch the switch, and a resistance calculation unit 9 that calculates the DC resistance of the circuit from the resistance value, voltage value, and switch state of the circuit are provided.

(Switches S1 to S6)
The switches S1 to S6 are installed in the manhole, and can be provided at any location of the cable 13. However, the switches S1 to S6 are provided near a portion requiring an accurate resistance distribution or a complicated circuit configuration. Is preferred.

(Function)
A processing procedure of the DC resistance calculation apparatus 10 having the above configuration will be described with reference to FIG.

  First, when an operation input is made by the operator, the switch switching unit 8 of the DC resistance calculation unit 1a issues a switching command to the device switching unit 5, and the connection is switched from the constant current power supply 15 to the DC ohmmeter 2 (step S1). ).

Next, the DC resistance measuring unit 6 operates the DC resistance meter 2 to measure the DC resistance (R _ALL ) of the lighting circuit unit 14 (step S2).
After the measurement, the switch switching unit 8 issues a switching command to the device switching unit 5 to switch the connection from the DC ohmmeter 2 to the DC power source 3 (step S3).

After switching, the switch switching unit 8 issues a switch-on command for the switch S1 of the lighting circuit unit 14, and switches on the switch S1 (steps S4 and S5).
Next, a DC voltage is applied to the circuit from the DC power source 3 (step S6), and the voltage measuring unit 7 obtains the measured voltages of the voltmeters 4a and 4b (step S7). At this time, the ground voltage at point A in FIG. 1 is VA, and the ground voltage at point B is VB.

Next, the resistance calculator 9 calculates the resistance value from the DC power source 3 to the switch S1 in FIG. 1 using the following equations (1) and (2) (step S8). Here, assuming that the voltage of the DC power supply 3 is E and the resistance of the lighting circuit section 14 is R _ALL , the resistance up to the switch S1 input point is that the resistance value on the A side is RA and the resistance value on the B side is RB. ,

RA = | R _ALL / E × VA | (1)
RB = | R _ALL / E × VB | (2)
It becomes.

  Next, the switch switching unit 8 issues a command to release the switch S1 to the device switching unit 5, and switches the switch S2 to the target (step S9). Thereafter, steps S5 to S9 are repeated. The above processing is performed for all switches (up to SL = S6 in the example of FIG. 1) (step S10).

Further, the resistance calculator 9 calculates the resistance between the switches from RA and RB obtained for each switch (step S11). For example, the resistance value R _S1 -S2 between the switch S1 and the switch S2 is expressed by the following equation (3), assuming that the B side resistance value when the switch S1 is turned on is RB _S1 and the B side resistance value when the switch S2 is turned on is RB _S2.
R _S1-S2 = RB _S1 -RB _S2 (3)
The resistance distribution of the lighting circuit section 14 can be calculated by calculating all the inter-switch resistances using the same equation.

(effect)
As described above, according to the DC resistance calculation device 10 according to the present embodiment, the DC resistance distribution of the lighting circuit unit 14 can be obtained with high accuracy. As a result, it becomes possible to grasp the difference between the resistance value obtained from the construction drawing and the actual resistance value and to find a connection error.

[Second Embodiment]
(Constitution)
The DC resistance calculation device according to the present embodiment has the same configuration as the DC resistance calculation device 10 of the first embodiment except that the switch switching unit 8 is omitted.

(Function)
A processing procedure of the DC resistance calculation apparatus according to the present embodiment will be described with reference to FIG.
First, before the DC resistance calculation is performed, the connection is manually switched from the constant current power supply 15 to the DC resistance meter 2 in the device switching unit 5.

Next, the DC resistance measuring unit 6 operates the DC resistance meter 2 to measure the DC resistance (R _ALL ) of the lighting circuit unit 14 (step S21).

  After the measurement, the connection in the device switching unit 5 is manually switched from the DC resistance meter 2 to the DC power source 3 and the switch S1 is turned on.

  At this time, the DC resistance calculation unit 1a is in a state of waiting for the switch S1 to be turned on (steps S22 and S23), but the operator proceeds to the next step by giving a flag indicating that the switch S1 has been turned on from the operation screen or the like. To do.

  That is, as in the first embodiment, a DC voltage is applied to the circuit from the DC power source 3 (step S24), and the voltage measuring unit 7 obtains the measured voltages VA and VB of the voltmeters 4a and 4b (step S25).

  Next, the resistance calculator 9 calculates the resistance values RA and RB from the DC power supply 3 to the switch S1 in FIG. 1 as in the first embodiment (step S26).

  Next, the target is switched to the switch S2 (Step S27), and Steps S23 to S27 are repeated. The above processing is performed for all switches (SL = S6 in this embodiment) (step S28).

  Further, the resistance calculator 9 calculates the resistance between the switches from the RA and RB obtained for each switch in the same manner as in the first embodiment (step S29). Thus, by calculating | requiring all the resistance between switches, resistance distribution of the lighting circuit part 14 is computable.

(effect)
In this embodiment, the switch switching unit 8 is omitted and the connection switching in the device switching unit 5 is manually performed. Therefore, compared to the method of the first embodiment, the switches S1 to S6 and the device switching unit 5 There is an advantage that means for connecting to the DC resistance calculation unit 1a is not required.

  Further, in the present embodiment, a labor is generated as compared with the method of the first embodiment, but a result equivalent to the method of the first embodiment can be obtained.

[Third Embodiment]
(Constitution)
In FIG. 4, the whole structure of the lighting circuit resistance measurement system which concerns on the 3rd Embodiment of this invention is shown.

  The DC resistance calculation device 20 of the lighting circuit resistance measurement system according to the present embodiment uses (1) a DC resistance calculation unit 1b in which the switch switching unit 8 is omitted, and (2) a device switching unit having a different switching part. The same as the DC resistance calculation device 10 of the first embodiment except for the three points of using 5 ′ and (3) disconnecting the connecting portions of the switches S1 to S6 from the lighting circuit unit 14. It is made up of.

(Function)
During normal operation, as shown in FIG. 4, the lighting circuit unit 14 is connected to the constant current power supply 15, and the switches S <b> 1 to S <b> 6 are not connected to the lighting circuit unit 14.

  When performing DC resistance measurement, after manually disconnecting the lighting circuit unit 14 from the constant current source 15, the device switching unit 5 ′ and the lighting circuit unit 14 are connected, and the lighting circuit unit 14 is connected to the DC resistance meter 2. To do. Similarly, the switches S1 to S6 are manually connected to the lighting circuit unit 14 as well.

  The subsequent procedure is as described in the second embodiment (FIG. 3). Steps S21 to S29 are performed. When the DC resistance measurement is completed, the procedure is manually returned to the normal operation state.

(effect)
If the switches S1 to S6 are always connected to the lighting circuit unit 14, insulation deterioration may be a problem. However, according to the present embodiment, by connecting only at the time of measurement, the influence of the insulation deterioration is minimized. can do.

[Fourth Embodiment]
(overall structure)
In FIG. 5, the whole structure of the lighting circuit resistance measuring system which concerns on the 4th Embodiment of this invention is shown.

  The lighting circuit resistance measurement system according to the present embodiment is configured by connecting a DC resistance calculating device 30 to a lighting circuit unit 14 that is a part to be measured.

(DC resistance calculation device 30)
The DC resistance calculating device 30 includes a DC resistance calculating unit 1c for calculating DC resistance, a DC resistance meter 2 for measuring the resistance of the lighting circuit unit 14, and a DC power source 3 for applying a DC voltage to the lighting circuit unit 14. The device switching unit 5 that switches the connection between the lighting circuit unit 14 and the device, and the voltmeters VM1 to VM7 connected between the lighting circuit unit 14 and the ground.

(DC resistance calculation unit 1c)
The DC resistance calculation unit 1c includes a DC resistance measurement unit 6 that obtains DC resistance information from the DC resistance meter 2, a voltage measurement unit 7 ′ that obtains a voltage from the voltmeters VM1 to VM7, and a circuit based on the resistance value and the voltage value of the circuit. And a resistance calculation unit 9 for calculating the direct current resistance.

(Voltmeters VM1 to VM7)
Voltmeters VM1 to VM7 are installed in the manhole. Among them, VM1 to VM6 can be provided at an arbitrary location of the cable 13, but it is preferable to provide them near a portion requiring an accurate resistance distribution or a complicated circuit configuration. On the other hand, VM7 is installed in the connection part of DC power supply 3. FIG.

(Function)
A processing procedure of the DC resistance calculation device 30 having the above configuration will be described with reference to FIG.
First, before the DC resistance calculation is performed, the connection is manually switched from the constant current power supply 15 to the DC resistance meter 2 in the device switching unit 5.

Next, the DC resistance measuring unit 6 operates the DC resistance meter 2 to measure the DC resistance (R _ALL ) of the lighting circuit unit 14 (step S31).

  After the measurement, the connection in the device switching unit 5 is manually switched from the DC resistance meter 2 to the DC power source 3.

  After the switching, the voltage measuring unit 7 'obtains the measured voltages V1 to V7 of the voltmeters VM1 to VM7 (step S32).

  Next, the resistance calculator 9 calculates the resistance between the voltmeters from the measured voltages V1 to V7 of each voltmeter and the resistance of the lighting circuit section 14 (step S33).

Here, when the voltage of the DC power supply 3 is E and the resistance of the lighting circuit unit 14 is R _ALL , the resistance value _RVM1-VM2 between the voltmeter VM1 and the voltmeter _VM2 is the measured voltage of the voltmeter VM1 as V1, When the voltage of the voltmeter VM2 is V2, it can be obtained from the following equation (4).
_{R VM1-VM2 = R ALL ÷} E × (V2-V1) ····· (4)

The resistance _{R E-VM1} between the DC power source 3 and the voltmeter VM1 can be obtained from the following equation (5).
R _E-VM1 = R _ALL ÷ E × V1 (5)

  Thus, by calculating | requiring all the resistance between voltmeters, the resistance distribution of the lighting circuit part 11 is computable.

(effect)
According to the direct current resistance calculation device 30 according to the present embodiment, by using the measurement voltages V1 to V7 of each voltmeter, compared to the first to third embodiments using the switches S1 to S6, one time The DC resistance distribution of the lighting circuit unit 14 can be obtained with high accuracy by measurement. As a result, it becomes possible to grasp the difference between the resistance value obtained from the construction drawing and the actual resistance value and to find a connection error.

[Fifth Embodiment]
In FIG. 7, the whole structure of the lighting circuit resistance measurement system which concerns on the 5th Embodiment of this invention is shown.

  The direct current resistance calculation device 40 of the lighting circuit resistance measurement system according to the present embodiment (1) uses a device switching unit 5 ′ having a different switching part, and (2) a voltmeter VM1 to a lighting circuit unit 14. The configuration is the same as that of the DC resistance calculation device 30 of the fourth embodiment except for the two points that the connection portion of the VM 6 is disconnected.

(Function)
During normal operation, the lighting circuit unit 14 is connected to the constant current power supply 15 and the voltmeters VM1 to VM6 are not connected to the lighting circuit unit 14 as shown in FIG.

  When performing DC resistance measurement, after manually disconnecting the lighting circuit unit 14 from the constant current source 15, the device switching unit 5 ′ and the lighting circuit unit 14 are connected, and the lighting circuit unit 14 is connected to the DC resistance meter 2. To do. Similarly, the voltmeters VM <b> 1 to VM <b> 6 are manually connected to the lighting circuit unit 14.

  The subsequent procedure is the same as that described in the fourth embodiment (FIG. 6). Steps S31 to S33 are performed, and when the DC resistance measurement is completed, the normal operation state is manually restored.

(effect)
If the voltmeters VM1 to VM6 are always connected to the lighting circuit unit 14, insulation deterioration may be a problem. However, according to this embodiment, the influence due to insulation deterioration is minimized by connecting only at the time of measurement. It can be.

[Sixth Embodiment]
(overall structure)
In FIG. 8, the whole structure of the lighting circuit resistance measuring system which concerns on the 6th Embodiment of this invention is shown.

  The lighting circuit resistance measurement system according to the present embodiment is configured by connecting a DC resistance calculating device 50 to a lighting circuit unit 14 that is a part to be measured.

(DC resistance calculation device 50)
The DC resistance calculation device 50 includes a DC resistance calculation unit 1d for calculating DC resistance, a DC power source 3 that applies a DC voltage to the lighting circuit unit 14, an ammeter 16 that measures the current of the DC power source 3, and a lamp. The apparatus switching part 5 which switches the connection of the circuit part 14 and an apparatus, and the wattmeters PM1-PM6 which measure the electric power of the lighting circuit part 14 are comprised.

(DC resistance calculation unit 1d)
The DC resistance calculation unit 1d calculates the DC resistance of the circuit from the current value and power value of the circuit, the current measurement unit 17 that acquires current from the ammeter 16, the power measurement unit 18 that acquires power from the wattmeters PM1 to PM6. A resistance calculating unit 9.

(Electric power meter PM1 to PM6)
The wattmeters PM1 to PM6 are installed in the manhole, and can be provided at any location of the cable 13. However, the wattmeters PM1 to PM6 are provided near a portion requiring a particularly accurate resistance distribution or a complicated circuit configuration. It is preferable.

(Function)
A processing procedure of the DC resistance calculation apparatus 50 having the above configuration will be described with reference to FIG.
First, before the DC resistance is calculated, the connection is manually switched from the constant current power supply 15 to the DC power supply 3 in the device switching unit 5.

  After switching, the ammeter 16 measures the current I flowing from the DC power source 3 to the lighting circuit unit 14, and the current measuring unit 17 obtains the measured value (step S41).

  Next, the power measuring unit 18 obtains the measured powers P1 to P6 of the wattmeters PM1 to PM6 (step S42).

  The resistance calculator 9 calculates the resistance between the wattmeters from the measured power P1 to P6 and the current value of each wattmeter (step S43).

For example, the resistance value _RPM1- PM2 between the power meter PM1 and the power meter PM2 is obtained from the following equation (6), where P1 is the measured power of the power meter PM1, P2 is the power of the power meter PM2, and I is the current. be able to.
R _PM1-PM2 = (P1-P2) ÷ I ² (6)

The resistance value R _E- PM1 between the DC power source 3 and the power meter PM1 can be obtained from the following equation (7), where E is the voltage of the DC power source 3.
R _E-PM1 = (E × I−P1) ÷ I ² (7)
Furthermore, the resistance value R _PM6-E between the power meter PM6 and the DC power source 3 can be obtained from the following equation (8), where P6 is the power of the power meter PM6.
R _PM6-E = P6 ÷ I ² (8)
Similarly, the resistance distribution of the lighting circuit unit 14 can be calculated by obtaining all the inter-wattmeter resistances.

(effect)
According to the DC resistance calculation device 50 according to the present embodiment, by using the measured powers P1 to P6 of the respective power meters PM1 to PM6, compared to the first to third embodiments using the switches S1 to S6, The DC resistance distribution of the lighting circuit unit 14 can be obtained with high accuracy by a single measurement. As a result, it becomes possible to grasp the difference between the resistance value obtained from the construction drawing and the actual resistance value and to find a connection error.

[Seventh Embodiment]
In FIG. 10, the whole structure of the lighting circuit resistance measuring system which concerns on the 7th Embodiment of this invention is shown.

  The direct current resistance calculation device 60 of the lighting circuit resistance measurement system according to the present embodiment includes (1) disconnecting the connecting portions of the wattmeters PM1 to PM6 from the lighting circuit unit 14, and (2) the DC power supply 3 and the lighting. The configuration is the same as that of the DC resistance calculation device 50 of the sixth embodiment except for two points that the connection portion with the circuit unit 14 is different.

(Function)
During normal operation, as shown in FIG. 10, the lighting circuit unit 14 is connected to the constant current power supply 15, and the power meters PM <b> 1 to PM <b> 6 are not connected to the lighting circuit unit 14.

  When performing DC resistance measurement, the lighting circuit unit 14 is manually disconnected from the constant current source 15 and the DC power source 3 and the lighting circuit unit 14 are connected. Similarly, the wattmeters PM1 to PM6 are manually connected to the lighting circuit unit 14 as well.

  The subsequent procedure is as described in the sixth embodiment (FIG. 9). Steps S41 to S43 are performed. When the DC resistance measurement is completed, the procedure is manually returned to the normal operation state.

(effect)
If the wattmeters PM1 to PM6 are always connected to the lighting circuit unit 14, insulation deterioration may be a problem. However, according to the present embodiment, the influence due to insulation deterioration is minimized by connecting only at the time of measurement. It can be.

  In the seventh embodiment (FIG. 10), the DC resistance calculation unit 1d in which the switch switching unit 8 is omitted is used as the DC resistance calculation unit. However, the DC resistance having the switch switching unit 8 as in the first embodiment is used. The calculation part 1a can also be used.

[Other embodiments]
(1) Although the example of the lamp connected by a rubber transformer is shown in the above embodiment, the present invention can be applied to a light source system that does not use a rubber transformer, for example, an LED lamp. In this case, the resistance of the rubber transformer connected in a loop may be replaced with the resistance of the LED lamp.

(2) As long as it is connected in a loop shape, it can be applied not only to lighting but also to an illumination light source system.

(3) In the first embodiment (FIG. 1) to the third embodiment (FIG. 4), the description has been made using the six cases of switches S1 to S6 for the sake of explanation. However, the number of switches is not limited. There may be at least one switch.

(4) In the fourth embodiment (FIG. 5) and the fifth embodiment (FIG. 7), the voltmeter has been described using seven cases of VM1 to VM7 for the sake of explanation. However, the number of voltmeters is limited. It is only necessary to have at least two voltmeters (one in the lighting circuit section 14 and one in the connecting portion of the DC power supply 3).

(5) In the sixth embodiment (FIG. 8) and the seventh embodiment (FIG. 10), the wattmeter is described using six cases of PM1 to PM6 for explanation, but the number of wattmeters is limited. It is not necessary to have at least one wattmeter.

(6) Third Embodiment (FIG. 4), Fourth Embodiment (FIG. 5), Fifth Embodiment (FIG. 7), Sixth Embodiment (FIG. 8), and Seventh Embodiment (FIG. 10) ), The DC resistance calculation unit 1b, 1c, or 1d in which the switch switching unit 8 is omitted is used as the DC resistance calculation unit. However, the DC resistance having the switch switching unit 8 as in the first embodiment (FIG. 1) is used. The calculation part 1a can also be used.

(7) In the third embodiment (FIG. 4) and the fifth embodiment (FIG. 7), the device switching unit 5 'is used. However, the device switching unit 5 of the first embodiment can also be used.

(8) Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

1a, 1b, 1c, 1d ... DC resistance calculation unit 2 ... DC resistance meter 3 ... DC power supply 4a, 4b ... Voltmeter 5, 5 ', 5 "... Device switching unit 6 ... DC resistance measurement unit 7, 7' ... Voltage measuring unit 8 ... switch switching unit 9 ... resistance calculating unit 10, 20, 30, 40, 50, 60, 100 ... DC resistance calculating device 11 ... lighting unit 12 ... rubber transformer 13 ... cable 14 ... light circuit unit 15 ... fixed Current power source 16 ... ammeter 17 ... current measuring unit 18 ... power measuring unit

Claims (11)

A light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A DC resistance measuring instrument for measuring the resistance of the entire light source circuit;
A DC power supply for applying a DC voltage to the light source circuit;
A voltage measuring device for detecting a terminal voltage of the connected DC power supply and the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A plurality of switches connected to any location of the light source circuit;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit;
Comprising
The DC resistance calculation unit, a DC resistance measurement unit for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument,
A voltage measuring unit that obtains a voltage value of a part of the light source circuit connected by the switch from the voltage measuring device when a direct current voltage is applied to the light source circuit from the direct current power source;
A resistance calculation unit for calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
A direct current resistance measurement system for a light source circuit. A light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A DC resistance measuring instrument for measuring the resistance of the entire light source circuit;
A DC power supply for applying a DC voltage to the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A voltage measuring instrument connected to an arbitrary portion of the light source circuit and the DC power source;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit;
Comprising
The DC resistance calculation unit, a DC resistance measurement unit for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument,
When a DC voltage is applied to the circuit from the DC power supply, a voltage measurement unit that obtains a voltage value of a part of the light source circuit from the voltage measuring instrument,
A resistance calculation unit for calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
A direct current resistance measurement system for a light source circuit. A light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A DC power supply for applying a DC voltage to the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC power source;
A power meter connected to any location of the light source circuit;
A current measuring instrument connected to the DC power source for measuring the current value of the entire light source circuit;
A DC resistance calculation unit for calculating a DC current of the light source circuit;
Comprising
The DC resistance calculation unit, a current measurement unit for obtaining a DC current value of the entire light source circuit from the DC current measuring instrument,
When a direct current voltage is applied to the light source circuit from the direct current power source, a power measurement unit that obtains a power value of a part of the light source circuit from the power meter;
A resistance calculator that calculates a direct current resistance of the light source circuit from a direct current value of the entire light source circuit, a power value of a part of the light source circuit, and a voltage value of the direct current power source;
A direct current resistance measurement system for a light source circuit.   The DC resistance calculation unit further includes a switch switching unit that issues a switching command to the device switching unit to switch a device connected to the light source circuit. 2. A direct current resistance measurement system for a light source circuit according to item 1. A DC resistance measuring instrument for measuring the resistance of the entire light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A DC power supply for applying a DC voltage to the light source circuit;
A voltage measuring device for detecting a terminal voltage of the connected DC power supply and the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A plurality of switches connected to any location of the light source circuit;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit;
Comprising
The DC resistance calculation unit, a DC resistance measurement unit for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument,
A voltage measuring unit that obtains a voltage value of a part of the light source circuit connected by the switch from the voltage measuring device when a direct current voltage is applied to the light source circuit from the direct current power source;
A resistance calculation unit for calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
An apparatus for measuring direct current resistance of a light source circuit, comprising: A DC resistance measuring instrument for measuring the resistance of the entire light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A DC power supply for applying a DC voltage to the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A voltage measuring instrument connected to an arbitrary portion of the light source circuit and the DC power source;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit;
Comprising
The DC resistance calculation unit, a DC resistance measurement unit for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument,
When a DC voltage is applied to the circuit from the DC power supply, a voltage measurement unit that obtains a voltage value of a part of the light source circuit from the voltage measuring instrument,
A resistance calculation unit for calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
An apparatus for measuring direct current resistance of a light source circuit, comprising: A DC power source for applying a DC voltage to a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape;
A device switching unit that switches connection between the light source circuit and the DC power source;
A power meter connected to any location of the light source circuit;
A current measuring instrument connected to the DC power source for measuring the current value of the entire light source circuit;
A DC resistance calculation unit for calculating a DC current of the light source circuit;
Comprising
The DC resistance calculation unit, a current measurement unit for obtaining a DC current value of the entire light source circuit from the DC current measuring instrument,
When a direct current voltage is applied to the light source circuit from the direct current power source, a power measurement unit that obtains a power value of a part of the light source circuit from the power meter;
A resistance calculator that calculates a direct current resistance of the light source circuit from a direct current value of the entire light source circuit, a power value of a part of the light source circuit, and a voltage value of the direct current power source;
An apparatus for measuring direct current resistance of a light source circuit, comprising: A DC resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape,
A DC resistance measuring instrument for measuring the resistance of the entire light source circuit;
A DC power supply for applying a DC voltage to the light source circuit;
A voltage measuring device for detecting a terminal voltage of the connected DC power supply and the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A plurality of switches connected to any location of the light source circuit;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit, and
A DC resistance measuring step for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument;
A voltage measuring step of applying a DC voltage to the light source circuit from the DC power source and obtaining a voltage value of a part of the light source circuit connected by the switch from the voltage measuring instrument;
A resistance calculating step of calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
A method for measuring a direct current resistance of a light source circuit. A DC resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape,
A DC resistance measuring instrument for measuring the resistance of the entire light source circuit;
A DC power supply for applying a DC voltage to the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC resistance measuring instrument or the light source circuit and the DC power source;
A voltage measuring instrument connected to an arbitrary portion of the light source circuit and the DC power source;
A DC resistance calculation unit for calculating the DC resistance of the light source circuit, and
A DC resistance measuring step for obtaining a DC resistance value of the entire light source circuit from the DC resistance measuring instrument;
A voltage measuring step of applying a direct current voltage to the light source circuit from the direct current power source, and obtaining a voltage value of a part of the light source circuit from the voltage measuring instrument,
A resistance calculating step of calculating a DC resistance of the light source circuit from a DC resistance value of the entire light source circuit, a voltage value of a part of the light source circuit, and a voltage value of the DC power supply;
A method for measuring a direct current resistance of a light source circuit. A DC resistance measurement method for a light source circuit in which a plurality of light sources are connected to a cable formed in a loop shape,
A DC power supply for applying a DC voltage to the light source circuit;
A device switching unit that switches connection between the light source circuit and the DC power source;
A power meter connected to any location of the light source circuit;
A current measuring instrument connected to the DC power source for measuring the current value of the entire light source circuit;
A DC resistance calculation unit for calculating a DC current of the light source circuit, and
A current measuring step of obtaining a direct current value of the entire light source circuit from the direct current measuring instrument;
A power measuring step of applying a direct current voltage to the light source circuit from the direct current power source, and obtaining a power value of a part of the light source circuit from the power meter;
A resistance calculating step of calculating a direct current resistance of the light source circuit from a direct current value of the entire light source circuit, a power value of a part of the light source circuit, and a voltage value of the direct current power source;
A method for measuring a direct current resistance of a light source circuit.   The direct current of the light source circuit according to any one of claims 8 to 10, wherein the switch, the voltage measuring device, or the power measuring device is connected to the light source circuit only during direct current resistance measurement. Resistance measurement method.

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