JP2020153823A - Simulation program and simulation method - Google Patents

Abstract

To simulate a search of an accident point by a Murrey loop method, even for a cable having a discretionary length and a discretionary section.SOLUTION: A simulation device 10 is made to function as a virtual bridge circuit 26A constituted by virtually connecting each end of a pair of cables 42 as a measurement terminal A, virtually connecting a variable resistor R1 and a fixed resistor R2 in series between each measurement terminal A and virtually shorting between each other end of each cable, a virtual high-voltage bridge measurement unit 26 for virtually measuring a current flowing between each measurement terminal A of the virtual bridge circuit by a galvanometer, a virtual DC high-voltage generation unit 24 for virtually applying a DC voltage between a connecting point between the variable and fixed resistors and the ground, and a cable accident position computation unit M6 for computing an accident-point position from the measurement terminal A of the cable on the basis of the discretionary length and discretionary section of the cable and the span position of an accident point in the section, and outputting the accident-point position of the cable to the virtual high-voltage bridge measurement unit 26.SELECTED DRAWING: Figure 3

Description

The present invention relates to a simulation program and a simulation method.

Conventionally, as a method of measuring a failure point of a metal core wire cable, measurement by the Murray loop method is known. For example, as this kind of measurement method, a method of reducing an error by passing a current having a different polarity, a method of analyzing a transient phenomenon in a measurement by a potential Murray loop method, and a transformer winding resistance. There are known methods for eliminating the error caused by the above, and a method for removing the influence of induction from the cable in another live state in the measurement of the failure point of the power cable.

For example, Patent Document 1 describes a failed metal core cable for communication or power transmission and distribution and the failure of the metal core cable for communication or power transmission and distribution for the purpose of facilitating the measurement of a failure point of the metal core wire cable for communication or power transmission and distribution by a simple method. A bridge circuit is constructed by combining healthy cables parallel to the cable, and the Murray loop method is used to detect the failure point by finding the resistance ratio from the connection point of the sound cable to the failure point to the failure point. In a measuring method for measuring a fault point of a cable, it is disclosed that a resistance element is connected between the connection point and the faulty cable.

JP-A-2005-91022

However, in the measurement by the conventional Murray loop method, since the target is a cable having a fixed length and a fixed cross section, the accident point is measured for a cable having an arbitrary length and an arbitrary cross section. There was a problem that it could not be done.
One embodiment of the present invention has been made in view of the above, and an object of the present invention is to simulate the search for an accident point by the Murray loop method even for a cable having an arbitrary length and an arbitrary section. is there.

In order to solve the above problem, the invention according to claim 1 is a simulation program for calculating the position of an accident point on a cable provided in a virtual space according to the Murray loop method using a computer. Each end of the pair of cables is virtually connected as a measurement end, a variable resistance and a fixed resistance are virtually connected in series between the measurement ends, and between the other ends of the cables. A virtual bridge circuit formed by virtually short-circuiting, a virtual high-voltage bridge measuring unit that virtually detects the current flowing between the measuring ends of the virtual bridge circuit with a flow detection meter, the variable resistance and the fixed resistance. A virtual DC high-voltage generator that virtually applies a DC voltage between the connection point between and the ground, an arbitrary length of the cable, an arbitrary section of the cable, and a span position of an accident point in the section. Based on the above, the accident point position of the cable from the measurement end is calculated, and the accident point position of the cable is output to the virtual high-voltage bridge measurement unit. And.

According to the present invention, the search for an accident point can be simulated by the Murray loop method even for a cable having an arbitrary length and an arbitrary section.

(A) is a schematic diagram for explaining a measurement circuit by the Murray loop method, and (b) is a circuit diagram showing an equivalent circuit of FIG. 1 (a). (A) is a block diagram showing a system in which the simulation apparatus according to the embodiment of the present invention faces each other via a network, and (b) shows the hardware configuration of the simulation apparatus according to the embodiment of the present invention. It is a block diagram which shows. It is a functional block diagram which shows a plurality of types of functional modules executed under OS management by a main control unit. It is a functional block diagram which shows a plurality of types of functional modules executed under OS management by a main control unit. It is a schematic diagram for demonstrating the virtual insulation resistance measurement part. It is a schematic diagram for demonstrating the virtual tester measurement part. It is a schematic diagram for demonstrating the virtual DC high voltage generation part. It is a schematic diagram for demonstrating the virtual high voltage bridge measurement part. It is a circuit diagram in the virtual space which shows the cable, the virtual high voltage bridge measuring part, and the virtual DC high voltage generating part arranged in each section from the point A to the tower TW. It is a figure which shows the route specification table used when inputting the route specification from the point A to the tower TW. It is a figure which shows the accident point setting table used when setting the possible accident point. It is a figure which shows the other setting table used when inputting other setting items. It is a figure which shows the Murray loop zero point deviation input table used when inputting the zero point deviation of a Murray loop. (A) is a diagram showing a megger preliminary measurement answer table when a 1000 V megger is used as a preliminary measurement, and (b) is a diagram showing a tester preliminary measurement answer table when a tester is used as a preliminary measurement. c) is a diagram showing an accident point search / span conversion table of a cable to be searched for an accident point, (d) is a diagram showing a measurement value answer table by the Murray loop method, and (e) is a diagram showing an accident point. It is a figure which shows the accident point identification answer table which identified. It is a flowchart which shows the operation procedure performed by an instructor and a trainee.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.
The present invention has the following configuration in order to simulate the search for an accident point by the Murray loop method even for a cable having an arbitrary length and an arbitrary section.
That is, the simulation program of the present invention is a simulation program that calculates the position of an accident point on a cable provided in a virtual space according to the Murray loop method using a computer, and the computer is used at each end of a pair of cables. Is virtually connected as the measurement end, variable resistance and fixed resistance are virtually connected in series between each measurement end, and a virtual bridge is formed by virtually short-circuiting each other end of each cable. A virtual high-voltage bridge measuring unit that virtually detects the current flowing between each measurement end of the circuit and virtual bridge circuit with a flow detection meter, and a DC voltage between the connection point between the variable resistor and the fixed resistor and the ground. Calculate the accident point position from the measurement end of the cable based on the virtual DC high voltage generator to be applied virtually, the arbitrary length of the cable, the arbitrary section of the cable, and the span position of the accident point in the section. It is characterized by functioning as a cable accident point position calculation unit that outputs the cable accident point position to the virtual high-voltage bridge measurement unit.
By providing the above configuration, it is possible to simulate the search for an accident point by the Murray loop method even for a cable having an arbitrary length and an arbitrary section.
The features of the present invention described above will be described in detail with reference to the following drawings. However, unless otherwise specified, the components, types, combinations, shapes, relative arrangements, etc. described in this embodiment are merely explanatory examples, not the purpose of limiting the scope of the present invention. ..
The above-mentioned features of the present invention will be described in detail below with reference to the drawings.

<Murray loop method>
FIG. 1A is a schematic diagram for explaining a measurement circuit by the Murray loop method. FIG. 1B is a circuit diagram showing an equivalent circuit of FIG. 1A.
As shown in FIG. 1, the measuring device 1 for measuring the failure point of the metal core wire cable for communication or power transmission / distribution is arranged in parallel with the failed metal core wire cable K ₂ and the failed metal core wire cable K ₂ . A bridge circuit 1 is configured by combining sound metal core cable K ₁ (of the same material as metal core cable K ₂ ).
This bridge circuit 1 includes a variable resistance R ₁ (resistance value R ₁ ), a resistance R ₂ (resistance value R ₂ ), a resistance value (R ₄ ) from the end of the metal core wire of the cable K ₂ to the failure point P, and a cable. It is composed of the resistance value R ₃ of the metal core wire between both ends of K ₁ and the resistance value (R ₃ −R ₄ ) from the end of the metal core wire of the cable K ₂ to the failure point P.
A DC power supply E is connected between the connection point of the variable resistor R ₁ and the resistor R ₂ and the failure point P via a ground resistor, and the connection point between the variable resistor R ₁ and the end of the cable K ₁ and the resistor. A galvanometer G is connected between R ₂ and the connection point between the end of the cable K ₂ .
Then, the failure point P is detected by obtaining the resistance ratio from the end of the metal core wire of the sound metal core wire cable K ₁ and the failed metal core wire cable K ₂ to the failure point P by the Murray loop method.

The bridge circuit 1 at the failure point P of the metal core wire cable K _{2 having} the above configuration has the following relationship. The resistance component between both ends of the metal core wire cables K ₁ and K ₂ is R _k .
In this case, as no current flows through the galvanometer G, by adjusting the resistance value R ₁ of the variable resistor R _1,
R ₁ / R ₂ = (2R _k −R ₄ ) / R ₄ (1)
Will be. Than this,
R ₄ / R _k = (2R ₂ R _k ) / (R ₁ + R ₂ ) R _k (2)
Will be. Further, assuming that the lengths between both ends of the metal core wire cable K ₁ and the lengths between both ends of the metal core wire cable K ₂ are equal, the respective lengths are L, and the length of the metal core wire from the end portion 22a to the failure point P. Let L ₁ be
R ₄ / R _k = L ₁ / L (3)
Because it is
L ₁ = (R ₄ / R _k ) L (4)
Will be. If L is known from this, L ₁ can be calculated by the equations (2) and (4), so that the position of the failure point P can be obtained.

<Simulation system>
FIG. 2A is a block diagram showing a system in which simulation devices according to an embodiment of the present invention face each other via a network.
The personal computer, which is a simulation device, is connected via the network N1 and is used as a PC10A for instructors and a PC10B for trainees, respectively.

<Simulation device>
FIG. 2B is a block diagram showing a hardware configuration of a simulation device according to an embodiment of the present invention.
The simulation device 10 is a personal computer, and includes a main control unit 12, a display control unit 14, a display unit 16, an operation unit 18, and a hard disk HD20.
The main control unit 12 includes a CPU (central processing unit) 12a, a ROM (read only memory) 12b, a RAM (random access memory) 12c, and a timer 12d inside. The CPU 12a reads the operating system OS from the ROM 12b, expands it on the RAM 12c, starts the OS, reads the application software program (processing module) from the ROM 12b under OS management, and executes various processes.
The display control unit 14 draws an image input from the main control unit 12 on the VRAM and displays it on the display unit 16.
The communication unit 15 is connected to another personal computer via the network N1.
The display unit 16 displays an image drawn on the VRAM by the display control unit 14.
The operation unit 18 includes a keyboard, a mouse, and the like.
The hard disk HD20 includes a database DB.

<Functional block diagram>
3 to 4 are functional block diagrams showing a plurality of types of functional modules executed under OS management by the main control unit 12, and as application software, on Excel (registered trademark) which is spreadsheet software. It may be a program to be executed.

<Virtual input section>
The virtual input unit 22 includes the following functional modules.
The cable cross-section input unit M1 inputs the cable cross-section (mm ² ), which is the cable size, and outputs the cable to the cable length conversion calculation unit M5.
The cable span length input unit M2 inputs the cable length (m) for each section and outputs it to the cable length conversion calculation unit M5. With reference to FIG. 9, it is assumed that A-P1, P1-P2, P2-P3, P3-P4, and P4-P5 are used as sections.

The accident point input unit M3 inputs the position of the accident point and the section position representing the position, and outputs the input to the cable accident point position calculation unit M6.
The Murray loop zero point deviation input unit M4 inputs the zero point deviation (%) in the Murray loop and outputs it to the zero point calculation unit M15.
The cable length conversion calculation unit M5 converts the input cable cross section (mm ² ) and the cable length for each section (m) into the cable length for each section, and outputs the cable to the cable accident point position calculation unit M6. To do.
The cable accident point position calculation unit M6 calculates what percentage of the cable accident point position is from the measurement end A based on the cable length for each section, the position of the accident point, and the section position representing the position. Then, the result (position of what percentage from the measurement end A) is output to the accident point position calculation unit M16.

<Virtual DC high voltage generator>
The virtual DC high voltage generator 24 includes the following functional modules.
The power selection unit M7 inputs an ON / OFF operation of the power switch 24a and outputs an ON signal or an OFF signal to the voltage adjustment unit M8.
When the ON signal is input from the power selection unit M7, the voltage adjusting unit M8 inputs an operation to the UP switch 24b and the DOWN switch 24c to adjust the voltage value.
The voltage value display unit M9 displays the voltage value on the voltage meter 24d.
The current value display unit M10 displays the current value on the current meter 24e.
The condition determination unit M11 determines whether or not the voltage value is 0 V and the current value is 5 to 20 mA, and outputs the voltage value, the current value, and the determination result to the accident point position calculation unit M16. ..

<Virtual high voltage bridge measurement unit>
The virtual high-voltage bridge measurement unit 26 includes the following functional modules.
The function selection unit M12 rotates the function dial 26a to switch to the earth fault mode (EARTH FAULT).
The sensitivity adjustment unit M13 adjusts the sensitivity value by inputting an operation to the UP switch 26b and the DOWN switch 26c.
The zero point adjustment unit M14 adjusts the zero point by inputting an operation to the UP switch 26d and the DOWN switch 26e.

The zero point calculation unit M15 inputs a zero point deviation (%) from the Murray loop zero point deviation input unit M4, calculates the zero point, and outputs the result (zero point).
The accident point position calculation unit M16 is the result input from the cable accident point position calculation unit M6 (the position of what percentage from the measurement end A) and the result input from the condition determination unit M11 (voltage value, current value, and determination result). ), Based on the result (zero point) input from the zero point calculation unit M15, when the voltage value 0V and the current value 5 to 20mA input from the condition determination unit M11 are satisfied, the cable accident point position calculation unit M6 The result (zero point adjustment result) input from the zero point calculation unit M15 is calculated for the result (cable accident point position) input from, and the result is output to the bridge circuit balance calculation unit M18.
The proportional side adjustment unit M17 adjusts the proportional side (RATIO ARM) based on the result (sensitivity value) input from the sensitivity adjustment unit M13, and outputs the adjustment result to the bridge circuit equilibrium calculation unit M18.

The bridge circuit balance calculation unit M18 performs the balance calculation of the bridge circuit based on the result (accident point calculation value) input from the accident point position calculation unit M16 and the result (adjustment result) input from the proportional side adjustment unit M17. Then, the calculation result is output to the equilibrium state display unit M19 and the bridge circuit equilibrium value display unit M20.
The equilibrium state display unit M19 detects the equilibrium state of both results based on the result (zero point) input from the zero point calculation unit M15 and the result (calculation value) input from the bridge circuit equilibrium calculation unit M18. It is displayed on 26f.
The bridge circuit equilibrium value display unit M20 displays the equilibrium value of the bridge circuit based on the result (calculated value) input from the bridge circuit equilibrium calculation unit M18.

<Virtual input section>
The virtual input unit 28 includes the following functional modules.
The megger value input unit M21 inputs a megger value and outputs it to the insulation resistance measurement point determination unit M27.
The accident phase input unit M22 inputs the accident phase (any one of red, white, and blue) and outputs it to the insulation resistance measurement point determination unit M27.

The ground fault resistance input unit M23 inputs the ground fault resistance value and outputs it to the virtual insulation resistance measurement unit 30.
The tester resistance value input unit M24 inputs the tester resistance value and outputs it to the virtual insulation resistance measurement unit 30.
The tester voltage value input unit M25 inputs the tester voltage value and outputs it to the virtual insulation resistance measuring unit 30.

<Virtual insulation resistance measurement unit>
The virtual insulation resistance measuring unit 30 includes the following functional modules.
The measurement point selection unit M26 selects a measurement point (between each phase and the ground) and outputs the measurement point to the insulation resistance measurement point determination unit M27.
The insulation resistance measurement point determination unit M27 is the result input from the megger value input unit M21 (mega value), the result input from the accident phase input unit M22 (accident phase), and the result input from the measurement point selection unit M26 ( Based on the measurement location (each phase-to-ground)), the megger value corresponding to each selected phase-to-ground and phase is output to the insulation resistance measurement value display unit M28.
The insulation resistance measurement value display unit M28 displays the result (insulation resistance measurement value) input from the insulation resistance measurement location determination unit M27.

<Virtual tester measurement unit>
The virtual tester measurement unit 32 includes the following functional modules.
The tester range measuring unit M29 inputs a resistance value (Ω, kΩ, MΩ) as a tester range, and inputs a voltage (V, kV, V [DC]) as a voltage range.
The tester measurement point determination unit M30 is input from the accident phase input unit M22 (accident phase), the ground fault resistance input unit M23 (ground fault resistance value), and the tester resistance value input unit M24. Based on the result (tester resistance value) and the result (tester voltage value) input from the tester voltage value input unit M25, it is determined whether the measurement point is between each phase and the ground or between the phases, and the tester range determination unit M31 determines. Output.
The tester range determination unit M31 determines the resistance value (Ω, kΩ, MΩ) as the tester range and the voltage (V, kV, V [DC]) as the voltage range.
The tester measurement value display unit M32 displays the value measured by the tester.

<Virtual insulation resistance measurement unit>
FIG. 5 is a schematic view for explaining the virtual insulation resistance measuring unit 30.
As shown in FIG. 5, the virtual insulation resistance measuring unit 30 is provided with a power switch 30a, a meter 30b, a lead wire 30c, and a lead wire 30d. The connection destination 30e of the lead wire 30c targets each point shown in FIG. 9, and is color-coded by, for example, red, white, and blue.
On the other hand, the connection destination 30f of the lead wire 30d targets each point shown in FIG. 9, and is, for example, color-coded in red, white, and blue, and further grounded.
The virtual insulation resistance measuring unit 30 can be used to measure the insulation resistance between each target to which both lead wires are connected, targeting each point shown in FIG.

<Virtual tester measurement unit>
FIG. 6 is a schematic diagram for explaining the virtual tester measuring unit 32.
As shown in FIG. 6, the virtual tester measuring unit 32 is provided with a power switch 32a, a digital meter 32b, a lead wire 32c, a lead wire 32d, and a measurement range 32e. The connection destination 30f of the lead wire 32c targets each point shown in FIG. 9, and is color-coded by, for example, red, white, and blue.
On the other hand, the connection destination 32g of the lead wire 32d is targeted at each point shown in FIG. 9, and is, for example, color-coded in red, white, and blue, and further grounded.
Using the virtual tester measuring unit 32, it is possible to measure the voltage and resistance between each target to which both lead wires are connected, targeting each point shown in FIG.
The measurement range 32e is provided with a resistance value (Ω, kΩ, MΩ) as a tester range and a voltage (V, kV, V [DC]) as a voltage range.

<Virtual DC high voltage generator>
FIG. 7 is a schematic diagram for explaining the virtual DC high voltage generator 24.
As shown in FIG. 7, the virtual DC high voltage generator 24 is provided with a power switch 24a, an UP switch 24b, a DOWN switch 24c, a voltage meter 24d, and a current meter 24e.
The power switch 24a inputs an ON / OFF operation and outputs an ON signal or an OFF signal.
The UP switch 24b and the DOWN switch 24c input the UP / DOWN operation and adjust the voltage value according to the UP / DOWN operation.
The voltage meter 24d displays the voltage value.
The current meter 24e displays the current value.

<Virtual high voltage bridge measurement unit>
FIG. 8 is a schematic diagram for explaining the virtual high voltage bridge measuring unit 26.
As shown in FIG. 8, the virtual high-voltage bridge measuring unit 26 includes a functional dial 26a, an UP switch 26b, a DOWN switch 26c, an UP switch 26d, a DOWN switch 26e, a flow detection meter 26f, an UP switch 26g, and a DOWN switch 26h. Side 26i is provided.
The function dial 26a is rotated to switch from a plurality of modes to a ground fault mode (EARTH FAULT).
The UP switch 26b and the DOWN switch 26c adjust the sensitivity value by inputting an operation to each of them.
The UP switch 26d and the DOWN switch 26e input an operation to each of them to adjust the zero point.
The galvanometer 26f displays the equilibrium state.
The UP switch 26g and the DOWN switch 26h input operations to each to adjust the position of the proportional side 26i between 0 and 100%.

<Circuit in virtual space>
FIG. 9 is a circuit diagram on a virtual space showing a cable, a virtual high voltage bridge measuring unit, and a virtual DC high voltage generating unit arranged in each section from the point A to the tower TW.
The virtual space 40 formed in the RAM 12c on the main control unit 12 (computer) is provided with a virtual DC high voltage generator 24, a virtual bridge circuit 26A, a cable 42, and the like.
The cable 42 includes, for example, three-phase cables 42R, 42S, and 42T provided in parallel, and any two of the three-phase cables are targeted for simulation.
Cable 42 is provided between the measuring portion A to the other P _5, the middle is provided with a virtual manhole P ₁ to P _4, the terminating lines L _z is connected to the other end P ₅ By being short-circuited.

Virtual bridge circuit 26A includes a pair of cables each end of the (42R, 42S, or two of the 42T) is virtually connected as a measuring portion A, a variable resistor _{R 1} between the measuring portion A and, fixed resistors R ₂ together with the connecting virtually in series, between the other ends P ₅ of each cable is formed by shorting the end line L _z.
Virtual DC high-voltage generator 24, a connection point between the variable resistor R ₁ and the fixed resistor R _2, a DC voltage is applied between the ground GND.

<Route specification table>
FIG. 10 is a diagram showing a route specification table used when inputting route specifications from the point A to the tower TW.
As shown in FIG. 10, in the route specification table 50, the section, the cable type, the cable size (cross section mm ² ), and the span length (m) are described in the vertical direction, respectively. In the route specification table 50, AP ₁ , P _1- P ₂ , P _2- P ₃ , P _3- P ₄ , and P _4- P ₅ are listed in the horizontal direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the description contents of the route specification table 50 are blank, and according to the operation by the user, for example, as shown in FIG. , The input data is listed in the route specification table 50.

<Accident point setting table>
FIG. 11 is a diagram showing an accident point setting table used when setting a conceivable accident point.
As shown in FIG. 11, in the accident point setting table 54, the accident phase in the vertical direction and the accident point (0 m input for the junction box) ground fault resistance in the horizontal direction are listed respectively.
The accident point setting table 54, laterally Shirosho (R phase), 0 m, 25k are described in each of _{P 4.}
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the description contents of the accident point setting table 54 are blank, and according to the operation by the user, for example, as shown in FIG. , The input data is listed in the accident point setting table 54.

<Other setting input table>
FIG. 12 is a diagram showing other setting tables used when inputting other setting items.
As shown in FIG. 12, in the other setting table 58, the accident phase (normal), the megger (2000 MΩ), the tester resistance (0 Ω), and the tester voltage (0 V) are listed in the lateral direction, respectively. In the other setting table 58, the accident phase (normal), red-blue, red-white, and white-blue are listed in the vertical direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the contents described in the other setting table 58 are blank, and according to the operation by the user, for example, as shown in FIG. The input data is shown in Other Setting Table 58.

<Zero point deviation input table>
FIG. 13 is a diagram showing a Murray loop zero point deviation input table used when inputting the zero point deviation of the Murray loop.
As shown in FIG. 13, in the zero point deviation input table 60, Murray loop zero point deviation (%) and “63” are described in the lateral direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the description content of the zero point deviation input table 60 is "63%", and the zero point deviation input is performed according to the operation by the user. The input data are listed in Table 60.

<Answer table>
FIG. 14 is a diagram showing an answer table including the contents of the calculation result.
<Megger preliminary measurement answer table>
FIG. 14A is a diagram showing a megger preliminary measurement answer table when a 1000 V megger is used as the preliminary measurement.
As shown in FIG. 14A, the megger preliminary measurement answer table 62 shows the far end open, the resistance (MΩ), the far end open, and the resistance (MΩ) in the lateral direction, respectively. In the Megger preliminary measurement answer table 62, red-E, white-E, blue-E, and judgment are described in the vertical direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the contents of the megger preliminary measurement answer table 62 are blank, and are read from the megger according to the operation by the instructor who is the questioner. The answer to the resistance value is described as input data.
In the example shown in FIG. 14A, as a judgment result by the user, a ground fault occurs in the white phase and there is no short circuit.

<Tester preliminary measurement answer table>
FIG. 14B is a diagram showing a tester preliminary measurement answer table when a tester is used as the preliminary measurement.
As shown in FIG. 14B, in the tester preliminary measurement answer table 64, the far end open, the resistance (Ω), the far end open, the resistance (Ω), and the voltage (V) are described in the lateral direction, respectively. There is. In the tester preliminary measurement answer table 64, red-E, white-E, blue-E, and judgment are described in the vertical direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the description contents of the tester preliminary measurement answer table 64 are blank, and the resistance value read from the tester according to the operation by the instructor. The answer is listed as input data.
In the example shown in FIG. 14B, as a judgment result by the user, a ground fault occurs in the white phase, there is no disconnection, and there is no influence of voltage.

<Accident point search / span conversion table>
FIG. 14C is a diagram showing an accident point search / span conversion table of a cable to be searched for an accident point.
As shown in FIG. 14C, the accident point search / span conversion table 66 shows the position name, the converted span length, and the cumulative total in the horizontal direction, respectively. In the accident point search / span conversion table 66, the position names A, P ₁ , P ₂ , P ₃ , P ₄ , P ₅ , and (total) are listed in the vertical direction, respectively.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the description contents of the accident point search / span conversion table 66 are blank, and the conversion span length is changed according to the operation by the instructor. , The answer to the cumulative total is described as input data.
In the fault point search-span conversion table 66, a cable provided between _{A-P 1} (CV800mm ²⁾ becomes the reference.

<Measured value answer table by Murray loop method>
FIG. 14D is a diagram showing a measurement value answer table by the Murray loop method.
As shown in FIG. 14D, the measurement value answer table 68 by the Murray loop method shows 58.6% as an indicated value in the horizontal direction.
At the stage when the simulation program of the present invention is started, that is, in the default state which is the initial state, the contents of the measured value answer table 68 by the Murray loop method are blank, and the answer to the indicated value is given according to the operation by the instructor. Is described as input data.

<Accident point specific answer table>
FIG. 14 (e) is a diagram showing an accident point identification answer table in which the accident point is specified.
As shown in FIG. 14 (e), in the accident point identification answer table 70, the distance from point A to the accident point after conversion is answered as "1198 m", which is a position of 2029 m × 58.6%. It shows that.
In the accident point identification answer table 72, the converted accident point younger side PNo. As it has been the answer to the "P _4". Further, in the accident point specific answer table 72, the distance from the accident point younger side P after conversion to the accident point is "0 m". Furthermore, the fault point specific solution tables 72 are answers to the distance "0m" Conversion from around the fault point young side P to the fault point, which indicates a position of 0m × 800mm ² / 1000mm ² There is.
The accident point specific answer Table 74, as the fault point, is the answer to the "0m point from P _4".

<Procedure flow>
FIG. 15 is a flowchart showing an operation procedure performed by the instructor and the trainee.
The instructor and the trainees execute the above-mentioned simulation program using the instructor PC10A and the trainee PC10B, respectively. At this time, it is assumed that the instructor PC10A and the trainee PC10B are connected via a network.
In step S5, the instructor inputs the question setting / answer to the instructor sheet for the instructor PC10A.
In step S10, the instructor inputs arbitrary values to the instructor PC 10A in the route specification table (FIG. 10), the accident point setting table (FIG. 11), and the other setting table (FIG. 12).
In step S15, the instructor inputs the question setting to the distribution sheet for the instructor PC10A.
In step S20, the instructor distributes the distribution sheet to the instructor's PC10A via the network to the trainee's PC10B. As a result, the distribution sheet is distributed from the instructor PC10A to the trainee PC10B via the network.

In step S25, the trainee uses a calculator or the like to set the problem setting and the route specification table (FIG. 10) included in the distribution sheet displayed on the trainee PC 10B, and convert the span length. , And calculate the cumulative total.
In step S30, the trainee refers to the sheet (megger preliminary measurement answer table, tester preliminary measurement answer table), and the virtual insulation resistance measurement unit 30 and the virtual tester measurement unit 32 displayed on the trainee PC 10B. To make a preliminary measurement.
In step S35, the trainee measures the insulation resistance using the virtual insulation resistance measuring unit 30 which is a 1000 V megger displayed on the trainee PC 10B, and fills in the sheet (megger preliminary measurement answer table). Here, the trainee identifies the accident phase between each phase and the ground by using the virtual insulation resistance measuring unit 30 displayed on the trainee PC 10B (FIG. 14A). In addition, the presence or absence of a short circuit between each phase is determined.

In step S40, the trainee measures the resistance using the virtual tester measurement unit 32 displayed on the trainee PC 10B and fills in the sheet (tester preliminary measurement answer table). Here, the trainee uses the virtual tester measurement unit 32 to identify the accident phase between each phase and the ground (FIG. 14 (a)). Further, the far end (P5) shown in FIG. 9 is short-circuited, and the AC voltage between each phase is measured for each phase.
In step S45, the trainee determines whether the high pressure Murray loop method can be applied.
In step S50, the trainees refer to the sheet (accident point search / span conversion table) displayed on the trainee PC10B and fill in the measured value answer table by the Murray loop method.

In step S55, the trainee sets the virtual high-voltage bridge measurement unit 26 displayed on the trainee PC 10B.
<Measurement procedure [1]>
In step S60, the trainee searches for a cable accident point (function selection unit M12 and power selection unit M7 shown in FIG. 3) according to the measurement procedure.
First, the trainee switches to the earth fault mode (EARTH FAULT) by rotating the function dial 26a of the virtual high-voltage bridge measurement unit 26 displayed on the trainee's PC 10B.
Next, the trainee adjusts the sensitivity value by operating the UP switch 26b and the DOWN switch 26c of the sensitivity adjustment unit M13 displayed on the trainee PC 10B.
Next, the trainee adjusts the zero point by operating the UP switch 26d and the DOWN switch 26e of the zero point adjustment unit M14 displayed on the trainee PC10B.
Next, the trainee switches to the input short mode by rotating the function dial 26a of the virtual high-voltage bridge measurement unit 26 displayed on the trainee PC 10B.

<Measurement procedure [2]>
Next, the trainee operates the power switch 24a of the power selection unit M7 of the virtual DC high voltage generation unit 24 displayed on the trainee PC 10B to turn on, and outputs an ON signal to the voltage adjusting unit M8.
When the ON signal is input from the power selection unit M7, the voltage adjusting unit M8 operates the UP switch 24b and the DOWN switch 24c to adjust the voltage value. At this time, the adjustment is made so that a stable current of 5 to 20 mA flows.

<Measurement procedure [3]>
Next, the trainee switches to the earth fault mode (EARTH FAULT) by rotating the function dial 26a of the virtual high-voltage bridge measurement unit 26 displayed on the trainee PC 10B.
Next, the trainee adjusts the proportional side (RATIO ARM) of the proportional side adjustment unit M17 displayed on the trainee PC 10B, and outputs the adjustment result to the bridge circuit equilibrium calculation unit M18. At this time, adjust so that the indication of the galvanometer becomes zero.
Next, the trainee reads the value indicated by the proportional side 26i of the virtual high-voltage bridge measurement unit 26 displayed on the trainee PC 10B.

In step S65, the student reads the measured value measured by the Murray loop method via the student PC 10B.
In step S70, the instructor distributes a distribution sheet for identifying the accident point to the trainees via the instructor PC10A.
In step S75, the trainee uses a calculator or the like to convert the cable length required for identifying the accident point with respect to the problem setting (FIG. 14) included in the distribution sheet displayed on the trainee PC 10B. The value (FIG. 14 (c)) is calculated.
In step S80, the student calculates back to the actual cable length and writes the actual location of the accident point on the distribution sheet (FIG. 14 (e)).

<Summary of actions and effects of the embodiment examples of this embodiment>
<First aspect>
The simulation program of this embodiment is a simulation program that calculates the position of an accident point on a cable 42 provided in a virtual space according to the Murray loop method using a simulation device 10 (computer), and the simulation device 10 is set to 1. virtually connected to each end of the pair of cables 42 as the measuring portion a, a variable resistor R _1, and a fixed resistor R ₂ while virtually connected in series between the measuring portion a, the other of each cable 42 A virtual bridge circuit 26A formed by virtually short-circuiting the ends, a virtual high-voltage bridge measuring unit 26 that virtually detects the current flowing between each measuring end A of the virtual bridge circuit 26A with a flow detection meter, and a variable resistor R. A virtual DC high-voltage generator 24 that virtually applies a DC voltage between the connection point between ₁ and the fixed resistor R ₂ and the ground, an arbitrary length of the cable 42, an arbitrary section of the cable 42, and a section. Cable accident point position calculation unit M6 that calculates the accident point position from the measurement end A of the cable 42 and outputs the accident point position of the cable 42 to the virtual high-voltage bridge measurement unit 26 based on the span position of the accident point in It is characterized by having each function as.
According to this aspect, each step can be executed by the simulation device 10, and as a result, the search for the accident point can be simulated by the Murray loop method even for a cable having an arbitrary length and an arbitrary section. Can be done.

<Second aspect>
In the simulation program of this embodiment, the cable cross-sectional area input unit M1 for inputting an arbitrary cross-sectional area of the cable 42, the cable span length input unit M2 for inputting an arbitrary span length of the cable 42, and the arbitrary cross-sectional area of the cable 42. , And, based on an arbitrary span length of the cable 42, it is converted into the length of the cable 42 and functions as a cable length conversion calculation unit M5 which is output to the cable accident point position calculation unit.
According to this aspect, it can be converted into a cable length based on an arbitrary cross section and an arbitrary span length, and the search for an accident point can be simulated by the Murray loop method.

<Third aspect>
The simulation program of this aspect is characterized in that it functions as an accident point input unit M3 for inputting an arbitrary section of the cable 42 and the span position of the accident point in the section.
According to this aspect, the search for the accident point can be simulated by the Murray loop method by inputting the span position of the accident point in an arbitrary section or section.

<Fourth aspect>
The virtual high-voltage bridge measuring unit 26 of this embodiment is a zero-point calculation unit M15 and a virtual DC high-voltage generating unit 24 that calculate a zero-point adjustment calculation value based on the deviation ratio of the pointer position with respect to the zero-point position of the flow detection meter. The voltage value and current value of the DC voltage input from, the accident point position of the cable 42 (the position of what percentage from the measurement end A) input from the cable accident point position calculation unit M6, and the zero point calculation unit M15. It is characterized in that it functions as an accident point position calculation unit M16 that calculates an accident point position based on the zero point adjustment calculation value.
According to this aspect, the accident point position can be calculated based on the zero point adjustment calculation value.

<Fifth aspect>
In the simulation program of this embodiment, the sensitivity adjusting unit M13 that virtually adjusts the sensitivity value according to the operation, and the proportional side adjusting unit M17 that virtually adjusts the proportional side according to the sensitivity value input from the sensitivity adjusting unit M13. It is characterized by functioning as.
According to this aspect, the sensitivity value can be virtually adjusted according to the operation, and the proportional side can be virtually adjusted according to the sensitivity value.

<Sixth aspect>
The simulation program of this embodiment is a bridge that calculates the equilibrium value of the virtual bridge circuit 26A based on the accident point position input from the accident point position calculation unit M16 and the proportional side adjustment result input from the proportional side adjustment unit M17. It is characterized by functioning as an equilibrium state display unit M19 that displays the equilibrium state of the equilibrium value input from the virtual bridge circuit 26A with respect to the zero point adjustment operation value input from the circuit equilibrium calculation unit M18 and the zero point calculation unit M15. And.
According to this aspect, the equilibrium state of the input equilibrium value can be displayed.

<7th aspect>
The simulation program of this embodiment is characterized in that it functions as a bridge circuit equilibrium value display unit M20 that displays the equilibrium value output from the bridge circuit equilibrium calculation unit M18.
According to this aspect, the equilibrium value can be displayed.

<8th aspect>
The simulation method of this embodiment is a simulation method of calculating the position of an accident point on a cable 42 provided in a virtual space according to the Murray loop method using a simulation device 10 (computer), and is a simulation method of a pair of cables 42. virtually connect each end as a measurement end a, the variable resistor R ₁ between the measuring portion a _together, and the fixed resistor R ₂ together with the connecting virtually in series, between the other ends of each cable 42 fixing a virtual bridge circuit forming by making virtually shorted, virtual pressure bridge measurement step of detecting virtually by the measuring portion a galvanometric meter a current flowing between the virtual bridge circuit, a variable resistor R ₁ resistor A virtual DC high-voltage generation step in which a DC voltage is virtually applied between the connection point with R ₂ and the ground.
Based on the arbitrary length of the cable 42, the arbitrary section of the cable 42, and the span position of the accident point in the section, the accident point position from the measurement end A of the cable 42 is calculated to determine the accident point position of the cable 42. The cable fault point position calculation step to be output to the virtual high-voltage bridge measuring unit 26 is executed, respectively.
Since the action and effect of the eighth aspect are the same as those of the first aspect, the description thereof will be omitted.

1 ... Bridge circuit, 10 ... Simulation device, 12 ... Main control unit, 12a ... CPU, 12b ... ROM, 12c ... RAM, 12d ... Timer, 15 ... Communication unit, 16 ... Display unit, 18 ... Operation unit, 20 ... Hard disk HD, 22 ... Virtual input unit, 26 ... Virtual high voltage bridge measurement unit, 26A ... Virtual bridge circuit, 28 ... Virtual input unit, 30 ... Virtual insulation resistance measurement unit, 32 ... Virtual tester measurement unit, M1 ... Cable cross-sectional area input unit , M2 ... Cable span length input unit, M3 ... Accident point input unit, M4 ... Input unit M, M5 ... Cable length conversion calculation unit, M6 ... Cable accident point position calculation unit, M7 ... Power selection unit, M8 ... Voltage adjustment Unit, M9 ... Voltage value display unit, M10 ... Current value display unit, M11 ... Condition determination unit, M12 ... Function selection unit, M13 ... Sensitivity adjustment unit, M14 ... Zero point adjustment unit, M14 ... Display control unit, M15 ... Zero Point calculation unit, M16 ... Accident point position calculation unit, M17 ... Proportional side adjustment unit, M18 ... Bridge circuit balance calculation unit, M19 ... Balance state display unit, M20 ... Bridge circuit balance value display unit, M21 ... Megar value input unit, M22 ... Accident phase input unit, M23 ... Ground fault resistance input unit, M24 ... Tester resistance value input unit, 24 ... Virtual DC high voltage generator, M25 ... Tester voltage value input unit, M26 ... Measurement point selection unit, M27 ... Insulation resistance Measurement point determination unit, M28 ... Insulation resistance measurement value display unit, M29 ... Tester range measurement unit, M30 ... Tester measurement point determination unit, M31 ... Tester range determination unit, M32 ... Tester measurement value display unit

Claims (8)

A simulation program that uses a computer to calculate the location of an accident point on a cable provided in a virtual space according to the Murray loop method.
The computer
Each end of the pair of cables is virtually connected as a measurement end, a variable resistor and a fixed resistor are virtually connected in series between the measurement ends, and the other ends of the cables are virtually connected. Virtual bridge circuit formed by short-circuiting
A virtual high-voltage bridge measuring unit that virtually detects the current flowing between the measuring ends of the virtual bridge circuit with a galvanometer.
A virtual DC high voltage generator that virtually applies a DC voltage between the connection point between the variable resistor and the fixed resistor and the ground.
Based on an arbitrary length of the cable, an arbitrary section of the cable, and the span position of the accident point in the section, the accident point position from the measurement end of the cable is calculated, and the accident point position of the cable is calculated. Is a simulation program characterized by functioning as a cable accident point position calculation unit that outputs the above to the virtual high-pressure bridge measurement unit. Cable cross-section input section for inputting any cross-section of the cable,
Cable span length input section for inputting any span length of the cable,
Based on an arbitrary cross-sectional area of the cable and an arbitrary span length of the cable, it is converted into the length of the cable and functions as a cable length conversion calculation unit to be output to the cable accident point position calculation unit. The simulation program according to claim 1, wherein the simulation program is characterized in that. The simulation program according to claim 2, wherein the simulation program functions as an arbitrary section of the cable and an accident point input unit for inputting the span position of the accident point in the section. The virtual high voltage bridge measuring unit
A zero point calculation unit that calculates a zero point adjustment calculation value based on the deviation ratio of the pointer position with respect to the zero point position of the galvanometer.
The voltage value and current value of the DC voltage input from the virtual DC high-voltage generator, the accident point position of the cable input from the cable accident point position calculation unit, and the zero point adjustment input from the zero point calculation unit. The simulation program according to claim 2, wherein the simulation program functions as an accident point position calculation unit that calculates an accident point position based on a calculated value. Sensitivity adjustment unit that virtually adjusts the sensitivity value according to the operation,
The simulation program according to claim 3, wherein the simulation program functions as a proportional side adjusting unit that virtually adjusts a proportional side according to a sensitivity value input from the sensitivity adjusting unit. A bridge circuit equilibrium calculation unit that calculates the equilibrium value of the virtual bridge circuit based on the accident point position input from the accident point position calculation unit and the adjustment result of the proportional side input from the proportional side adjustment unit.
The third aspect of claim 3, wherein the unit functions as an equilibrium state display unit that displays the equilibrium state of the equilibrium value input from the virtual bridge circuit with respect to the zero point adjustment operation value input from the zero point calculation unit. Simulation program. The simulation program according to claim 6, wherein the simulation program functions as a bridge circuit equilibrium value display unit that displays the equilibrium value output from the bridge circuit equilibrium calculation unit. A simulation method that uses a computer to calculate the location of an accident point on a cable provided in a virtual space according to the Murray loop method.
Each end of the pair of cables is virtually connected as a measurement end, and a variable resistor and a fixed resistor are virtually connected in series between the measurement ends, and between the other ends of the cables. Virtual bridge circuit steps formed by virtually short-circuiting
A virtual high-voltage bridge measurement step that virtually detects the current flowing between the measurement ends of the virtual bridge circuit with a galvanometer.
A virtual DC high voltage generation step in which a DC voltage is virtually applied between the connection point between the variable resistor and the fixed resistor and the ground.
Based on an arbitrary length of the cable, an arbitrary section of the cable, and the span position of the accident point in the section, the accident point position from the measurement end of the cable is calculated, and the accident point position of the cable is calculated. A simulation method characterized by executing each of a cable fault point position calculation step for outputting the above to the virtual high-pressure bridge measuring unit.

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