JP7150583B2 - Voltage drop visualization device for DC feeding system - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Act of publication: Publication date: August 28, 2018, Publication: Proceedings of the 2018 Industrial Application Society Conference of the Institute of Electrical Engineers of Japan, (2) Act of publication: Date: 2018 August 29, name of the meeting and location: The 2018 Industrial Applications Society Conference of the Institute of Electrical Engineers of Japan, Yokohama National University (79-1 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa)

The present invention relates to a DC feeding system voltage drop visualization device for visualizing a voltage drop in a DC feeding system in an electric railway.

In electric railways, substations are provided along the railway line at appropriate distances depending on the frequency of train operation.
In addition, in electric railways, if the voltage of the pantograph (hereinafter referred to as the pantograph voltage) of the vehicle that contacts the feeder line that receives power from the substation decreases, the acceleration force will decrease. In order to compensate or recover surplus power of the regenerative power generated by the regenerative braking of the electric train, a power recovery device or power storage device incorporating a rechargeable battery is provided. Incidentally, as an invention relating to the power recovery device, there is one described in Patent Document 1, for example.

In addition, in order to avoid risks in the event of an earthquake or other disaster, railway operators should set intervals between substations in advance so as to secure the pantograph voltage necessary for train operation even in the event that one of the multiple substations fails. However, when increasing the number of trains, it is necessary to grasp the points where the feeder voltage drops significantly. If the voltage drop in the feeder is significant, additional facilities such as a substation and a power storage device may be installed. In addition, when a train delay occurs and a large number of electric cars exist in one DC feeding system, if all the trains start powering at the same time, the pantograph voltage will drop and the electric cars will break down. If the number of trains is increased, it will be necessary to restart the trains, which may hinder stable operation.

JP 2012-180078 A JP 2014-27737 A

Since the charge/discharge control in the power recovery device of Patent Document 1 is performed simply by detecting the current and voltage of the feeder line regardless of the pantograph voltage, frequent charge/discharge switching occurs, resulting in battery failure. is damaged, and the life of the device is shortened. Therefore, it is important to grasp the pantograph point voltage in charge/discharge control of the power recovery device.
In addition, when grasping the voltage drop in the DC feeding system, if multiple electric trains are running on one DC feeding system, the voltage drop in the feeder line is the sum of the voltage drops due to the current flowing in the multiple electric trains. Therefore, it is necessary to perform complicated calculations according to the train distribution, and there is a problem that it takes time to obtain the results. There is also a need to visually present the voltage drop to transport dispatchers who are unfamiliar with railway electricity.

Furthermore, an electric car running on a DC feeding system has the characteristic that when the pantograph voltage exceeds a voltage higher than the substation output voltage (about 1600 V), such as 1700 V, the regenerative current starts to be throttled. From the viewpoint of effective use of regenerative energy, it is important to suppress the feeding voltage so that the pantograph voltage does not exceed 1700 V, and it is necessary to perform complicated calculations when performing such control.
As an invention for calculating the voltage drop in the power transmission line, there is one described in Patent Document 2, but this invention does not relate to the feeding system of the electric railway, This is a method of calculating the setting value of a line voltage drop compensator in a power transmission network for use in the present invention.

The present invention has been made under the above background, and aims to intuitively grasp the magnitude of the voltage drop in the DC feeding system in an electric railway by visual information without performing complicated calculations. It is an object of the present invention to provide a voltage drop visualization device for a direct current feeding system.

In order to achieve the above object, the present invention
In a voltage drop visualization device for a DC feeding system for simulating voltage changes at contact points of pantographs of electric trains in DC feeding lines laid along tracks to supply power from substations,
A board with multiple horizontal lines marked at equal intervals on the front as a scale indicating the voltage value,
a pair of locking means simulating a substation provided at predetermined height positions on both sides of the board;
one or more stretchable elastic cords simulating a feeder line stretched between the pair of locking means;
and a weight having a hook that can be hung at an arbitrary position of the elastic cord and having a weight corresponding to a current value during power running of the electric vehicle.

According to the above means, the amount of displacement of the weight suspended by the elastic string (rubber string) corresponds to the amount of voltage drop at the pantograph point due to the current flowing during power running, and when a plurality of electric cars are running, The total amount of displacement of each weight corresponds to the amount of voltage drop at the pantograph point. Therefore, it is possible to intuitively grasp the magnitude of the voltage drop in the DC feeding system in the electric railway from the information obtained visually, without performing complicated calculations.

Here, preferably, a movable plate is joined to the front surface of the board so as to be movable in the left and right direction, a pulley is rotatably mounted to the front surface of the movable plate, and a hook is coupled to one end and to the other end. and a filamentous body to which a weight having a weight corresponding to the regenerative current value of the electric vehicle is coupled, wherein the filamentous body is in a state in which a hook at one end of the filamentous body is hooked to the elastic cord. By being wound around the pulley, it is configured to be able to simulate a regenerative electric vehicle.
According to this configuration, it is possible to intuitively grasp the amount of voltage increase at the pantograph point due to the regenerative current when the electric train that performs the regenerative operation is running.

Further, desirably, the movable plate has an engaging portion that can be engaged with the upper edge of the board, and the engaging portion slides along the upper edge of the board to move in the left-right direction. configure as possible.
According to such a configuration, a component simulating an electric vehicle that performs regenerative operation can be moved to an arbitrary position between a pair of locking means (locking pins), that is, between substations, with a relatively simple configuration. It is possible to grasp the voltage change that occurs on the feeder line.

Preferably, the piece has a concave portion in the upper part to which the elastic cord can be engaged, and can be attached to the front surface of the board, and can simulate a power storage device or a substation by pushing up the elastic cord from below. configured to have
According to this configuration, when considering adding a new power storage device or substation between substations, it is possible to verify the voltage change of the feeder line due to the addition, and support the work of determining the location of the addition. can do.

Preferably, both sides of the board are formed with a pair of slits along the vertical direction, and the pair of locking means are engaged with the pair of slits so that the height position can be adjusted. do.
According to such a configuration, it is possible to verify the voltage drop in the DC feeding system when the transmission voltage of a plurality of lines with different substation transmission voltages or when the transmission voltage of the substation is changed.

According to the present invention, a voltage drop visualization device for a DC feeding system that can intuitively grasp the magnitude of the voltage drop in a DC feeding system in an electric railway from visually obtained information without performing complicated calculations. There is an effect that it is possible to realize

1 is a perspective view showing a first embodiment of a voltage drop visualization device for a DC feeding system according to the present invention; FIG. (A) is an enlarged view showing the shape of a locking pin that is attached to a board and locks a rubber string that constitutes the voltage drop visualization device of the embodiment; It is an enlarged view showing a specific example of the structure. (A) is an equivalent circuit of a DC feeding system, and (B) is an explanatory diagram showing a model of the voltage drop visualization device of the embodiment. It shows how to use the voltage drop visualization device of the embodiment, (A) is an explanatory diagram showing a simulated state when three trains are running and the power storage device is out of service, and (B) is a discharge operation of the power storage device when three trains are running. FIG. 10 is an explanatory diagram showing a simulated state when the Another method of using the voltage drop visualization device of the embodiment is shown, (A) is an explanatory diagram showing a simulated state when one train flows regenerative current when two trains are running and the power storage device is out of service, (B). 4 is an explanatory diagram showing a simulated state when charging the power storage device while regenerative current is flowing; FIG. FIG. 2 is a perspective view showing a second embodiment of a voltage drop visualization device for a DC feeding system according to the present invention; FIG. 4 is an enlarged perspective view and a side view showing a clip as an accessory in the voltage drop visualization device of the first embodiment and the second embodiment, and how it is used. It is an explanatory diagram showing a method of using the voltage drop visualization device of the second embodiment, and showing a simulated state when a large number of trains are running in one feeder system section or when an intermediate substation is suspended. It is an explanatory view showing a simulated state when a substation is added to an intermediate point between two existing substations, showing a method of using the voltage drop visualization device of the second embodiment. It is an explanatory view showing a simulated state when a power storage device and a substation are added between two existing substations, showing an example of use of the voltage drop visualization device of the second embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a DC feeding system voltage drop visualization device according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of the first embodiment of the voltage drop visualization device of the present invention.
As shown in FIG. 1, the DC feeding system voltage drop visualization device 10 of this embodiment includes a rectangular board 11 made of a lightweight material such as plastic, and the board 11 is vertically supported. and a steel stand 12 for The stand 12 has a horizontal plate portion 12A and a horizontally elongated flange portion 12B standing vertically from the upper surface of the plate portion 12A. It is On the front surface of the board 11, horizontal lines L1, L2, . Numbers such as 1800V, 1700V, ... 900V are printed.

Locking pins 13A that simulate a substation (more specifically, a rectifier, a transformer for a rectifier, or an electric power storage device) are placed on both sides of the board 11 at the height of the horizontal line of 1620 V, which is the transmission voltage of the substation. , 13B are attached. Both ends of two rubber cords 14A, 14B each having a predetermined elastic modulus and simulating an existing feeder line are locked to the locking pins 13A, 13B. The cords 14A and 14B are stretched without slack. The elastic modulus and tension of the rubber cords 14A and 14B are determined according to the type of feeder line (thickness, allowable current, etc.) used in the feeder system to be verified.

Since the types of feeders, trolley wires and rails used in existing electric railways are almost fixed, the characteristics of rubber cords to be used can be determined in advance. The reason why the two rubber cords 14A and 14B are stretched is to make it possible to simultaneously verify the conditions of the up line and the down line. In addition, different types of rubber cords may be stretched so that feeder lines of different types of feeder lines can be simulated. Furthermore, in order to provide versatility, rubber cords with a plurality of types (three or more types) of tension may be prepared according to the types of feeder lines assumed.

The voltage drop visualization device of the present embodiment includes a plurality of weights 15A that simulate an electric vehicle in power running at arbitrary positions on the rubber cord 14A or 14B. The weight of the weight 15A corresponds to the magnitude of the load current consumed by the motor of the electric train during power running, and has a hook 15a on the top and a cavity (pocket) 15b on the main body to form one train. Since the magnitude of the load current differs when the number of vehicles to be driven or the number of powering notch stages changes, the weight, ie, the magnitude of the load current can be adjusted by inserting or removing a metal ball from the hollow portion 15b. It is preferable that an illustration of a vehicle is printed on the front surface of the main body of the weight 15A so that the user can intuitively recognize that the weight 15A is a part simulating a train.

As shown in FIG. 2A, the locking pin 13A (13B) has a threaded portion 13a (13b) with a male thread formed at the rear end thereof. It is fixed by inserting it through the formed through hole 11a (11b) and screwing the nut N to tighten it. Two ring-shaped grooves 13c are formed on the outer periphery of the locking pin 13A (13B) on the front end side, and ends of the rubber cords 14A and 14B are wound around each groove 13c to form a knot. It is configured to be locked by The through-holes 11a and 11b may be elongated holes in the vertical direction so that the positions (heights) at which the locking pins 13A and 13B are fixed can be adjusted. This means that the transmission voltage of the substation can be adjusted.

Further, a vertical slit 11c is formed in the board 11 at approximately the middle position between the locking pins 13A and 13B. A holding piece 16B (not shown) forming a downward triangle is mounted so as to be slidable in the vertical direction. As shown in FIG. 2B, the holding piece 16A (16B) has a knurled screw 16a (16b) that can be screwed into a female screw formed on the rear end surface. It is fixed by inserting it into the slit 11c formed in , screwing it into the female screw on the rear end face of the restraining piece 16A (16B), and tightening it by turning the knob.

A groove 16c is formed at the apex of the restraining piece 16A (16B), and the rubber string 14A or 14B can be engaged with this groove 16c. By appropriately setting the position, it is configured to function as a component capable of simulating a substation. The groove 16c may be formed to have a width that allows the two rubber cords 14A and 14B to be engaged at the same time.

Furthermore, the voltage drop visualization device of this embodiment includes a vertically long movable plate 17 joined to the front surface of the board 11, as shown in FIG. The movable plate 17 has a bent piece 17a at its lower end portion which is joined to the upper surface of the horizontal plate portion 12A of the stand 12, and a knurled plate which can be engaged with a slit 11d formed horizontally along the upper end of the board 11. It has a screw 17b at its upper end and is configured to be movable in the left-right direction along the front surface of the board 11 .

A pulley 18 is rotatably attached to the front upper portion of the movable plate 17, and a hook 19a is attached to one end of the pulley 18, and a weight 15B simulating an electric car is attached to the other end of the pulley 18. A wire 19 is wound thereon, and a hook 19a is engaged with the rubber cord 14A or 14B from below, thereby applying an upward force to the rubber cord. The weight 15B attached to the wire 19 also has a pocket into which a metal ball having a weight corresponding to the magnitude of the regenerative current flowing during braking of the electric car can be thrown. As a result, the weight 15B on the front surface of the movable plate 17 can function as a part that simulates an electric train during regeneration.

で表わされる。 Next, the reason why the voltage drop visualization device of the above embodiment using the rubber cords 14A, 14B and the weights 15A, 15B can mechanically simulate the voltage drop in the DC feeding system will be explained with reference to FIGS. ) will be used to explain. Among them, FIG. 3A shows an equivalent circuit of the DC feeding system, and FIG. 3B shows a model of the voltage drop visualization device of the embodiment.
Among the symbols shown in FIGS. 3A and 3B, E ₁ and E ₂ are the transmission voltages of the substations A and B, L is the distance between the substations A and B, and V is the substations A and B. x is the distance from the substation A to the electric car, F is the weight of the weight W (15A), h1, h2 are the vertical displacement of the weight W (15A), T is the rubber It represents the tension in the cords 14A, 14B.
The load current I in the equivalent circuit of FIG.

is represented by

ここで、ｋはゴム紐のバネ定数、Ｌ₀はゴム紐の自然長、Ｌ₁，Ｌ₂はそれぞれ支点からのゴム紐の長さである。 On the other hand, in the mechanical model of FIG. 3(B), the vertical component of the resultant force of the tension T' from one end and the other end bears the load of the weight W, so the following equations (2) to (5) A relational expression such as

Here, k is the spring constant of the rubber cord, L ₀ is the natural length of the rubber cord, and L ₁ and L ₂ are the lengths of the rubber cords from the fulcrum.

が得られる。また、ｈ₁，ｈ₂＜＜ｘ，ｈ₁，ｈ₂＜＜（Ｌ－ｘ）の関係が成り立つ範囲では、式（６）は次式（７）

のように、変形することができる。 The above formula (5) is a function of the variable h, and the following formula (6) is obtained by differentiating the formula (5) with respect to h

is obtained. In addition, in the range where the relationship h ₁ , h ₂ <<x, h ₁ , h ₂ <<(L−x) holds, the expression (6) is replaced by the following expression (7)

can be transformed as

で表わされる。ここで、式（８）を式（２）に代入し、近似式sinθ₁≒tanθ₁＝ｈ₁/ｘ，sinθ₂≒tanθ₂＝ｈ₂/(Ｌ－ｘ)を利用して式を変形すると、次式（９）のようになる。

ここで、ｈ²，ｈ²，ｈ₁ｈ₂よりも高次の項を無視すると、次式（10）
が得られる。

In addition, the tension T' of the rubber cord after the weight is hung has a relationship of L' = L + (dL') / dh x h in the range where the variable h is sufficiently small. ) and from equation (7), the following equation (8)

is represented by Here, substituting equation (8) into equation (2), and modifying the equation using the approximation sin θ ₁ ≈ tan θ ₁ = h ₁ /x, sin θ ₂ ≈ tan θ ₂ = h ₂ /(L−x) Then, it becomes like following Formula (9).

Here, ignoring terms higher than h ² , h ² , h ₁ h ₂ , the following equation (10)
is obtained.

Comparing the above formula (10) and formula (1), it can be seen that the physical quantities in the equivalent circuit of FIG. 3A and the physical quantities in the mechanical model of FIG. I understand.

Next, a specific method of using the voltage drop visualization device of the above embodiment will be described with reference to FIGS. 4 and 5. FIG.
FIG. 4A shows the case where three trains are powered between substations A and B (locking pins 13A and 13B) while the intermediate power storage device is not in operation. represents an example of simulation with a voltage drop visualization device. In FIG. 4A, the pantograph voltages Vp1, Vp2 and Vp3 of the three trains are 1260V, 1140V and 1260V in order from the substation A side. Here, if the regulated voltage (minimum voltage to be maintained) on the line is, for example, 1200 V, in FIG. In this state, the three trains on the line between the substations A and B cannot run (power running) at the same time.

Assuming that a power storage device with a discharge voltage of, for example, 1300 V is operated, if the rubber cord 14A or 14B is engaged with the groove on the top of the restraining piece 16B, as shown in FIG. , the rubber cord 14A or 14B is pushed up by the pressing piece 16B, and the pantograph point voltage Vp2 becomes 1200V. Therefore, by discharging the power storage device, it is possible to simultaneously run three trains (power running) between the substations A and B.

On the other hand, when a train running between substations A and B executes regenerative braking, the rubber cord 14A or 14B is pushed up as shown in FIG. 5(A). Here, when the transmission voltage of the substation is 1620V, if the pantograph voltage exceeds 1750V for an electric vehicle capable of regenerative operation, the regenerative current is throttled to protect the vehicle from overvoltage. In that case, the amount of recoverable energy decreases and waste occurs.
Even in such a case, if the power storage device provided between the substations A and B is charged, the train running between the substations A and B will be charged as shown in FIG. It can be seen that the pantograph point voltage can be prevented from exceeding 1750 V even if the regenerative operation is performed at , thereby avoiding the restriction of the regenerative current. According to the voltage drop visualization device of the above embodiment, such a situation can be easily verified on the desk.

Next, a second embodiment of the voltage drop visualization device according to the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a perspective view showing the configuration of the voltage drop visualization device of the second embodiment. In FIG. 6, the same or corresponding parts as those of the voltage drop visualization device of the first embodiment shown in FIG.

As shown in FIG. 6, in the voltage drop visualization device 10 of the second embodiment, an engaging portion 17c having a U-shaped cross section that can be engaged with the upper edge of the board 11 is provided on the upper portion of the movable plate 17. By engaging the engaging portion 17 c with the upper edge of the board 11 , the movable plate 17 is configured to be movable in the left-right direction along the front surface of the board 11 . Vertical slits 17e and 17f are formed in the left and right sides of the board 11, and the screw portions 13a and 13b (FIG. 2) at the rear ends of the locking pins 13A and 13B are inserted through the slits 17e and 17f. The locking pins 13A and 13B are configured to be fixed at arbitrary height positions. As a result, the transmission voltage of the substation can be adjusted, and verification can be performed for lines with different transmission voltages.

In addition, in the voltage drop visualization device of the present embodiment, in order to be able to verify the voltage drop in the feeder system when a new substation is installed between the existing substations A and B, the substation A substation simulator 30 is provided to simulate the This substation simulator 30 includes an L-shaped support plate 31 to be joined to the front surface of the board 11, a coil spring 32 having one end (upper end) coupled to the lower end of the support plate 31, and the other end of the coil spring 32 ( and an upward triangular push-up piece 33 connected to the lower end). The upper portion of the push-up piece 33 is formed with a groove with which the rubber cords 14A and 14B can be engaged, similarly to the hold-down piece 16A (16B) of FIG. 2(A). In order to prevent interference with the rubber cords 14A and 14B, the push-up piece 33 is suspended from the lower end of the coil spring 32 using a thread 34 made of a material with high tensile strength such as fishing line. Good to configure.

A vertical slit 31a is formed in the support plate 31, and the threaded portion of the knurled screw 35 is inserted through the slit 31a and passes through a through hole (not shown) provided in the board 11, A nut is screwed to the tip so that it can be attached and detached. By providing the slit 31a in the support plate 31 in this manner, the height position of the push-up piece 33 can be adjusted. By forming a horizontal slit (11d) as shown in FIG. distance) may be changed.

In the voltage drop visualization device 10 of the present embodiment, the reason why the push-up piece 33 for lifting the rubber cord is suspended via the coil spring 32 as described above is that the DC voltage of the substation is the internal impedance of the power system, This is because there is a phenomenon that the impedance of the rectifier transformer and the voltage drop of the diode cause the current to drop in proportion to the magnitude of the current supplied to the load, so that the relationship can be visualized.

Furthermore, in the voltage drop visualization device 10 of the second embodiment, as shown in FIGS. 7A and 7B, a clip 36 capable of restraining the two rubber cords 14A and 14B is prepared as an accessory. there is A substation has a plurality of feeder lines (four lines in a typical example), and the voltage of each line is normally equalized via a DC bus. Therefore, by preparing the clip 36 as described above, when installing a new substation or power storage device at the intermediate point of the existing substation, the rubber cords 14A, By attaching a clip 36 to the same position of 14B and restraining both, it is possible to verify the voltage drop in the feeder system in a state simulating current interchange between the up and down lines. This clip 36 can also be used in the first embodiment.

Next, a specific method of using the voltage drop visualization device 10 of the second embodiment will be described with reference to FIGS. 8 to 10. FIG.
FIG. 8 shows an example of a case where five trains are powered running between existing substations A and B (locking pins 13A and 13B) on the way and simulated by the voltage drop visualization device of the above embodiment. Represent. In FIG. 8, the pantograph point voltage Vp3 of the train in the center becomes less than the specified value, so assume that a substation C is added at a position approximately midway between the substations A and B as shown in FIG. However, if, for example, three trains run simultaneously between substations A and C (power running), the pantograph point voltage Vp2 will fall below the specified value. Therefore, as shown in FIG. 10, if a power storage device D and a substation C are added at a position where the substations A and B are divided into three, three trains will run between the substation A and the power storage device D. It can be seen that even if the vehicles are driven at the same time (powered operation), none of the pantograph voltages will drop below the specified value. By using the voltage drop visualization device of the second embodiment, the above verification can be performed easily and in a short time.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the embodiment. For example, in the above embodiment, the two rubber cords 14A and 14B are stretched between the locking pins 13A and 13B. It is also possible to The cords 14A and 14B are not limited to those made of rubber, and may be made of other materials as long as they have a relatively large elongation rate.
Further, in the above embodiment, the weights of the weights 15A and 15B are adjusted by adjusting the number of metal balls put in the pocket portions. may be provided to continuously suspend a plurality of weights. It is also possible to configure a simple voltage drop visualization device by omitting the holding pieces 16A and 16B simulating the power storage device and the slit 11c for mounting them.

In the above-described embodiment, the pulley 18 is provided on the front surface of the movable plate 17. However, the pulley 18 is placed on the engaging portion 17c at the upper end of the movable plate 17 in FIG. You can set it. In this case, the weight 15B hangs down on the back of the board 11. For example, the weight 15B can be seen from the front side by forming the board 11 with a transparent acrylic plate or the like. Further, in the embodiment, a plurality of horizontal lines serving as scales indicating voltage values are marked on the front surface of the board 11 at regular intervals, but the lines may not be arranged at regular intervals.

Furthermore, in the above embodiment, an example of verifying the voltage drop in the feeder system when a new substation or power storage device is added between the existing substations was described, but the voltage drop visualization device according to the present invention It can also be used to verify the voltage drop of the feeder system when the existing power storage system is replaced with a substation.
The present invention can also be used to visualize the voltage drop on a single feeding section that delivers power from a single substation. Specifically, in the case of a one-side feeding section, a locking pin simulating a virtual substation is arranged at a position that is twice the distance x from one substation to the electric train of interest. The voltage drop can be visualized by hanging a weight equal to twice the load current of the car. Alternatively, it is also possible to simulate a virtual substation using a movable plate 17 provided with locking pins (corresponding to 13A or 13B) simulating a substation to visualize the voltage drop.

10 voltage drop visualization device 11 board 12 stand 13A, 13B locking pin (substation simulation part)
14A, 14B rubber cord (feeder line simulation part)
15A, 15B weights (electric vehicle simulation parts)
15a hook 16A, 16B holding pieces (power storage device simulation parts)
17 Movable plate 18 Pulley 30 Substation simulator A, B Substation W Weight

Claims (5)

A voltage drop visualization device for a DC feeding system for simulating a voltage change at a contact point of a pantograph of an electric vehicle in a DC feeding line laid along a track to supply power from a substation,
A board with multiple horizontal lines marked on the front as a scale indicating the voltage value,
a pair of locking means simulating a substation provided at predetermined height positions on both sides of the board;
one or more stretchable elastic cords simulating a feeder line stretched between the pair of locking means;
A voltage drop visualization device for a DC feeding system, comprising a weight having a hook that can be hung at an arbitrary position of the elastic cord and a weight corresponding to a current value during power running of an electric vehicle. . A movable plate joined to the front surface of the board so as to be movable in the horizontal direction, a pulley rotatably mounted on the front surface of the movable plate, and a hook connected to one end and a regenerative current value of the electric car to the other end and a filament to which a weight having a weight corresponding to is attached, and the filament is wound around the pulley in a state in which the hook at one end of the filament is hooked on the elastic cord. 2. A voltage drop visualization device for a DC feeding system according to claim 1, which is configured to be able to simulate an electric train in regenerative operation. The movable plate has an engaging portion that can be engaged with the upper edge of the board, and is configured to be movable in the left-right direction by sliding the engaging portion along the upper edge of the board. 3. A voltage drop visualization device for a DC feeding system according to claim 2, characterized in that: Equipped with a piece that has a concave portion in the upper part with which the elastic cord can be engaged, can be attached to the front surface of the board, and can simulate a power storage device or a substation by pushing up the elastic cord from below. A voltage drop visualization device for a DC feeding system according to any one of claims 1 to 3, characterized by: 1. A pair of slits are formed in both sides of said board along the vertical direction, and said pair of locking means are engaged with said pair of slits so as to be able to adjust the height position thereof. 5. A voltage drop visualization device for a DC feeding system according to any one of 1 to 4.

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