Load resistor

Abstract

The present invention provides a load resistor, in which a plurality of resistor rods arranged in the load resistor generate heat only below about 100°C by, for example, power supplied from an emergency generator, and the heat is rapidly cooled by simply exposing the resistor rods to air, so that there is no need to provide a cooling device for forcibly cooling the resistor rods, and thus there is no need for a cooling fan which is very heavy and has a large capacity and occupies about half the weight and about half the volume of the load resistor. The present invention relates to a load resistor, which receives power transmitted from a device and performs a power-on test on the device, and the load resistor comprises: a rod-shaped resistor substrate, which generates heat by the power being supplied; a tubular protective member, which is inserted through the rod-shaped resistor substrate; and a rod-shaped resistor having an insulating member, which is filled between the rod-shaped resistor substrate and the protective member, and the rod-shaped resistor substrate is used by stretching a nickel-chromium alloy wire wound into a coil.

Description

Technical Field

[0001] The present invention relates to a load resistor which generates heat during an operation test, i.e., a load test, of an emergency generator, and more particularly to a load resistor which does not require a large cooling device. Background Art

[0002] In recent years, the demand for load resistors for operating tests of emergency generators, etc. has increased dramatically. For example, load resistors are used in regular operating tests of emergency generators installed in office buildings or department stores, or in normal operating tests of power generation devices such as solar panels and wind turbines.

[0003] In the conventional load resistor, the multiple resistance rods arranged in the resistor are actually heated to about 200°C by power supply from an emergency generator, for example, and the temperature of the assembly of the resistance rods rises to 400°C to 600°C.

[0004] Therefore, the structure is as follows: in order to cool the heat generation temperature and ensure the safety of the load resistor itself and the surroundings, a large cooling device must be installed, for example, at the bottom of the load resistor to blow air from bottom to top to cool the above-mentioned multiple resistor rods.

[0005] However, a large cooling device composed of a cooling fan and the like is very heavy and has a large capacity, accounting for about half of the weight and about the lower half of the capacity of the load resistor. Therefore, countermeasures for the heat generation of the above-mentioned resistor rod and lightening of the cooling device for cooling the heated resistor rod have become issues.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2010-25752 Summary of the invention

[0009] Problems to be solved by the invention

[0010] Therefore, the present invention is invented in view of the above-mentioned previous requirements, previously proposed solutions, and social trends in recent years. The purpose of the present invention is to provide a load resistor, wherein a plurality of resistor rods arranged in the load resistor only generate heat below about 100°C, for example, by power supply from an emergency generator, and then, the heat is rapidly cooled by exposing the resistor rods to the air. Therefore, there is no need to provide a cooling device for forced cooling of the resistor rods, and thus, there is no need for a cooling fan which is very heavy and has a large capacity and occupies about half the weight and about half the volume of the load resistor.

[0011] Technical solutions to solve problems

[0012] The present invention relates to a load resistor, which receives power transmitted from a device and performs a power-on test on the device, and is characterized in that:

[0013] The load resistor includes: a rod-shaped resistor base body, the rod-shaped resistor base body generates heat by passing the electric power; a tubular protective member, the tubular protective member is inserted through the rod-shaped resistor base body; and a rod-shaped resistor body having an insulating member filled between the rod-shaped resistor base body and the protective member.

[0014] The above-mentioned rod-shaped resistor base is used by stretching a nickel-chromium alloy wire wound into a coil shape;

[0015] or,

[0016] The present invention relates to a load resistor, which receives power transmitted from a device and performs a power-on test on the device, and is characterized in that:

[0017] The load resistor includes: a rod-shaped resistor base body, which generates heat by passing the electric power; a tubular protective member, which is inserted through the rod-shaped resistor base body; and a rod-shaped resistor body having an insulating member filled between the rod-shaped resistor base body and the protective member.

[0018] The rod-shaped resistor base is used by stretching the nickel-chromium alloy wire wound into a coil shape by more than 2 times;

[0019] or,

[0020] The present invention relates to a load resistor, which receives power transmitted from a device and performs a power-on test on the device, and is characterized in that:

[0021] The load resistor includes: a rod-shaped resistor base body, the rod-shaped resistor base body generates heat by passing the electric power; a tubular protective member, the tubular protective member is inserted through the rod-shaped resistor base body; and a rod-shaped resistor body having an insulating member filled between the rod-shaped resistor base body and the protective member.

[0022] The above-mentioned rod-shaped resistor substrate uses an iron-chromium wire in a straight state. In the iron-chromium wire, the amount of nickel in the nickel-chromium heat-resistant alloy wire is reduced, and the nickel-chromium alloy is replaced by iron accounting for several tens of percent;

[0023] or,

[0024] The invention is characterized in that a substantially square resistor box is formed by mounting a plurality of rod-shaped resistor elements formed by using the above-mentioned rod-shaped resistor base so as to be connected in parallel and in series;

[0025] In the above-mentioned substantially square resistor box, the above-mentioned plurality of rod-shaped resistors are installed at the upper part starting from the substantially middle position in the longitudinal direction, and a space portion is provided at the lower part starting from the substantially middle position in the longitudinal direction;

[0026] A plurality of the resistor boxes can be connected horizontally and / or vertically, and load tests can be performed on the above-mentioned devices with different power output capacities;

[0027] or,

[0028] The invention is characterized in that a substantially square resistor box is formed by mounting a plurality of rod-shaped resistor elements formed by using the above-mentioned rod-shaped resistor base so as to be connected in parallel and in series;

[0029] In the above-mentioned substantially square resistor box, the above-mentioned plurality of rod-shaped resistors are installed at the upper part starting from the substantially middle position in the longitudinal direction, and a space portion is provided at the lower part starting from the substantially middle position in the longitudinal direction;

[0030] A plurality of the resistor boxes can be connected horizontally and / or vertically, so that load tests can be performed on the devices having different power output capacities;

[0031] A fan device for making air flow in the up-down direction is installed in the resistor box space portion arranged at a substantially middle position in the height direction of the above-mentioned longitudinally connected resistor boxes;

[0032] or,

[0033] The feature is that the fan device can be installed in the space portion of the resistor box arranged at any position;

[0034] or,

[0035] The invention is characterized in that, in the resistor box, a plurality of rod-shaped resistors are installed in a lateral direction of the resistor box, and an operating portion can be provided on a surface in the front-rear direction of the resistor box;

[0036] When the resistor box is inspected or fails, the resistor box can be moved forward and backward to perform inspection or failure operations;

[0037] or,

[0038] It is characterized in that the forward and backward movement of the resistor box is performed by causing casters mounted on the resistor box to run on rails.

[0039] Effects of the Invention

[0040] According to the present invention, the multiple resistor rods arranged in the resistor only generate heat to below about 100°C even if they are supplied with electricity from, for example, an emergency generator. Therefore, there is a large cooling device that does not need to forcibly cool the heat. Thus, the excellent effect of a cooling device that does not need a cooling fan or the like is achieved. The cooling device is very heavy and has a large capacity, and constitutes about half the weight and about half the volume of the load resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 FIG. 1 is a structural diagram for explaining a load resistor of the present invention;

[0042] Figure 2 FIG. (2) is a structural diagram for explaining a load resistor of the present invention;

[0043] Figure 3 An explanatory diagram (1) for explaining the structure of a rod-shaped resistor substrate of the present invention;

[0044] Figure 4 FIG. (2) is an explanatory diagram for explaining the structure of the rod-shaped resistor substrate of the present invention;

[0045] Figure 5 This is an explanatory diagram for explaining the structure of a conventional rod-shaped resistor base. DETAILED DESCRIPTION

[0046] The drawings show an embodiment of the invention.

[0047] The present invention firstly provides a load resistor 4 for receiving electric power transmitted from a device to conduct an electric-on test of the device, and the load resistor 4 comprises: a rod-shaped resistor base 1 which generates heat by conducting the electric-on test; a tubular protective member 9 through which the rod-shaped resistor base 1 passes; and a rod-shaped resistor 2 having an insulating member 8 filled between the rod-shaped resistor base 1 and the protective member 9, wherein the rod-shaped resistor base 1 is used by stretching a nickel-chromium alloy wire wound into a coil.

[0048] Furthermore, an example is given in which a nichrome wire wound into a coil is stretched twice or more and used.

[0049] In the present invention, the amount of nickel in the rod-shaped resistor base 1 is reduced, and the nickel-chromium content is replaced by iron at a ratio of several tens percent.

[0050] Here, it can be seen that if the type of heating wire such as nichrome wire that is powered is changed, or the current or voltage of the power that is powered is changed to conduct experiments, the electric heat is proportional to the product of voltage and current. In addition, according to Ohm's law, it can be understood that it is also proportional to the product of the square of the current and the resistance.

[0051] If it is written correctly as a formula, it becomes calorific value = 0.24 × voltage × current × time = 0.24 × (current) 2 × resistance × time.

[0052] This formula is called Joule's law, and electric heat is called Joule heat. It denies the long-standing view that heat is matter, and determines that heat is the ability to do work (energy).

[0053] Conventionally, a power-on test for confirming whether a generator such as an emergency generator is operating normally is performed by operating the generator to generate electricity and passing the generated electricity to a load resistor.

[0054] Furthermore, as the electric heating wire in the resistance rod constituting the load resistor, a generally used heating wire, that is, a Nichrome wire wound in a coil shape is used.

[0055] The nichrome wire is, for example, an alloy in which nickel and chromium are mixed at a ratio of 80:20. The nichrome wire is wound into a coil as described above, and current is passed through the coil to serve as a dummy load.

[0056] Here, the reason for winding the nichrome wire into a coil shape is to locally concentrate the heat generated by the nichrome wire and to maximize the use of the locally concentrated heat as thermal energy.

[0057] That is, the amount of nickel-chromium wire per unit space increases, and the convection of air is hindered to some extent, so it is easy to be at a high temperature. In addition, if the so-called heating part is formed into a coil shape and densely packed, the resistance value becomes higher, which results in the following advantage, that is, the current flowing through becomes less, and power consumption can be suppressed.

[0058] However, in the field of use of load resistors, it can be said that it is completely unnecessary to use a nichrome wire wound in a coil shape in a heating element used in a resistance rod of a load resistor.

[0059] This is because, if a nichrome wire wound in a coil is used as a dummy load in a resistance rod of a load resistor, the nichrome wire wound in a coil generates heat, causing a rapid temperature rise, and the temperature rise must be forcibly cooled to control it.

[0060] Therefore, conventionally, a powdered insulating member 8 is sandwiched around a coiled nickel-chromium heat-resistant alloy wire and placed in a tubular protector 9 to form a rod-shaped resistor 2, or a plurality of heat sinks 10 are provided on the outer periphery of the tubular protector 9 for heat dissipation.

[0061] Furthermore, a large cooling fan must be installed below the plurality of rod-shaped resistors 2 to forcibly blow air upward to cool the heat generated by the nichrome wire wound in a coil.

[0062] Therefore, the present inventors first corrected and eliminated the state in which the nichrome wire used above was wound into a coil.

[0063] The heating wire in the rod-shaped resistor 2 constituting the load resistor does not need to obtain the heat generated locally and concentrate it, and the locally concentrated heat temperature should be utilized as thermal energy to the maximum extent. On the contrary, it is better to generate less heat and the temperature near the heating part should also drop rapidly.

[0064] Therefore, the inventors of the present invention proposed a method of extending a Nichrome wire wound in a coil shape to make the length of the Nichrome wire at least twice that of the length in the coil shape into an electric heating wire to serve as a heating element.

[0065] Refer to the following Figure 3 The embodiments of the present invention will be described below.

[0066] Reference numeral 1 denotes a rod-shaped resistor base body according to the present invention. The rod-shaped resistor base body 1 is formed by, for example, stretching a conventional nichrome wire to a length at least twice the length when wound into a coil.

[0067] That is, for example, a heating wire such as a nickel-chromium alloy wire with a wire diameter of 1.2 mm is wound into a coil with a total length of 600 mm. Then, the nickel-chromium alloy wire wound in the coil is made into a heating element with a length of more than twice (for example, more than 1200 mm), thereby forming a rod-shaped resistor substrate 1.

[0068] Furthermore, the cross-sectional shape of the rod-shaped resistor base member 1 is not limited to a circle, but may be a square or a strip shape such as an ellipse, a quadrilateral, a pentagon, etc. A cross-sectional shape that generates a low heat temperature when energized, i.e., a shape with a large surface area, is selected. Therefore, in order to expand the surface area of ​​the outer periphery, the outer periphery may be configured in a so-called star-shaped shape.

[0069] When a current of 20A was applied to the rod-shaped resistor base 1 stretched to more than twice its length, a temperature rise to a low temperature of only about 68°C was observed near the periphery of the above-mentioned rod-shaped resistor base 1, and it was confirmed that the temperature from the very high heat generation decreased near the periphery.

[0070] That is, it is known that if the nichrome wire wound into a coil is stretched and the surface area including the space is increased, the heat generated will be continuously radiated to the outside. In other words, the heat dissipation effect becomes very good.

[0071] Furthermore, when a current of 20 A was passed through the rod-shaped resistor base 1 and exposed to the outside air, a temperature rise to a low temperature of only about 40° C. was observed near the outer periphery of the rod-shaped resistor base 1 .

[0072] That is, even if a large cooling fan is not used to force air to blow onto the rod resistor base 1 as in the past, it can be confirmed that there is air swaying on the outside of the energized rod resistor base 1. If the wind blows onto the periphery of the rod resistor base 1, it can be confirmed that the temperature near the periphery of the rod resistor base 1 further decreases under the influence of the wind.

[0073] In addition, the inventors extended the heating element formed by the nickel-chromium heat-resistant alloy wire wound into a coil shape to form a rod-shaped resistor substrate 1 with a length more than twice the length, and inserted it into a SUS tube with a diameter of 12 mm, i.e., a protective member 9, and filled an insulating component 8 such as magnesium oxide between the above-mentioned rod-shaped resistor substrate 1 and the inner circumferential surface of the SUS tube to form a rod-shaped resistor body 2.

[0074] When a current of 20 A flows through the rod-shaped resistor 2 , a temperature rise to a low temperature of approximately 40° C. is observed near the outer periphery of the rod-shaped resistor 2 .

[0075] Furthermore, when air was blown from the outside to the rod-shaped resistor 2, it was confirmed that the temperature near the outer periphery of the rod-shaped resistor 2 dropped to a low temperature of about 31°C.

[0076] Even if a large cooling fan is not used as in the past to forcibly blow air to the rod-shaped resistor 2, there is still air shaking outside the energized rod-shaped resistor base 1. If the wind blows to the outer periphery of the rod-shaped resistor base 1, it can be confirmed that the temperature of the rod-shaped resistor base 1 further decreases under the influence of the wind.

[0077] In addition, the inventors of the present invention also conducted experiments on a rod-shaped resistor body 10 using an existing nickel-chromium heat-resistant alloy wire wound into a coil. That is, an existing heating wire made of a nickel-chromium heating wire (symbol NCHW1), with a conductor resistance of about 40 (Ω / m) and a wire diameter of 1.2 mm, was wound into a coil, and the total length of the coil was 600 mm to form a rod-shaped resistor base body 10.

[0078] Then, the rod-shaped resistor base body 1 having the above-mentioned structure was inserted into a tube having a diameter of 12 mm, that is, a SUS tube having a heat sink 10 mounted on the outer peripheral surface of a protective member 9, and magnesium oxide as an insulating member 8 was filled between the above-mentioned nickel-chromium heating wire and the inner peripheral surface of the SUS tube to form a rod-shaped resistor body 2. This constituted a conventional rod-shaped resistor body 2. A current of 20 A flowed through the rod-shaped resistor body 2.

[0079] Then, a temperature of about 200° C. is detected on the rod-shaped resistor base 1, and a temperature rise of about 200° C. is also observed near the periphery thereof.

[0080] Then, the temperature in the vicinity of the assembly of the rod-shaped resistors 2 rises to 400° C. to 600° C.

[0081] Thus, according to the load resistance test, when the temperature near the periphery of the rod resistor 2 reaches a high temperature of 200°C or more due to the load resistance test, and the temperature near the periphery of the assembly rises to 400°C to 600°C, in order to cool the heat generation temperature, a large cooling device for cooling the rod resistor 2 must be provided. However, the above-mentioned cooling device is heavy and has a large capacity, and the weight of the load resistor itself becomes heavy, resulting in a large size.

[0082] On the other hand, when the rod-shaped resistor base 1 of the present invention is used, there is no need to forcibly cool the rod-shaped resistor base 1, so that a load resistor that does not require a large cooling device can be provided.

[0083] Next, the inventors reduced the amount of nickel in the above-mentioned nickel-chromium heat-resistant alloy wire and replaced it with iron (about several tens of percent) as the heating wire in the resistance rod of the load resistor, and used it in a straight state. As a result, the heating of the conventional resistance rod can be suppressed to below about 100°C, and there is no need to set up a large cooling device.

[0084] An example of the rod-shaped resistor base body of this embodiment is a straight rod-shaped resistor base body 1 having a wire diameter of 5.5 mm, a length of 600 mm, and made of an iron-chromium heating wire (symbol FCHW1·No.30).

[0085] For the rod-shaped resistor substrate composed of the iron-chromium heating wire, when the wire diameter is 5.5 mm, the conductor resistance is 0.0598 Ω / m, which is very low.

[0086] Therefore, the inventors inserted a linear rod-shaped resistor substrate 1 with a wire diameter of 5.5 mm, a length of 600 mm, and a material of iron-chromium heating wire (symbol FCHW1·No.30) into a SUS tube with a diameter of 12 mm, i.e., a protective material 9, and filled magnesium oxide as an insulating component 8 between the iron-chromium heating wire and the inner circumference of the SUS tube to form a rod-shaped resistor body 2.

[0087] A current of 20 A was passed through the rod-shaped resistor 2 , and as a result, temperature detection was confirmed only at a low temperature of about 40° C. in the rod-shaped resistor 2 .

[0088] Furthermore, a current of 20A was passed through the rod-shaped resistor 2, and air was blown from the outside, and it was confirmed that the temperature of the rod-shaped resistor 2 dropped to a low temperature of about 31°C. Even if air is not forcibly blown to the rod-shaped resistor 2 using a cooling fan or the like as in the past, there is air shaking outside the energized rod-shaped resistor base 1, and if the wind blows to the outer periphery of the rod-shaped resistor base 1, it can be confirmed that the temperature of the rod-shaped resistor base 1 will further drop under the influence of the wind.

[0089] Next, the load resistor 4 formed using the rod-shaped resistor base 1 of the present invention will be described.

[0090] As can be understood from the drawings, a plurality of rod-shaped resistor elements 2 formed using the above-described rod-shaped resistor base 1 are connected in parallel and in series to form a substantially square resistor box 3 .

[0091] Furthermore, in the resistor case 3 formed in the substantially square shape, the plurality of rod-shaped resistors 2 are installed from the substantially middle position in the longitudinal direction to the upper part, and a space portion 11 is provided from the substantially middle position in the longitudinal direction to the lower part.

[0092] Here, in the present invention, a plurality of resistor boxes 3 may be connected in the horizontal direction, and may also be stacked and connected in the vertical direction.

[0093] As described above, by connecting in the horizontal direction or the vertical direction, a load test of the devices having different power output capacities can be performed using one load resistor 4.

[0094] Furthermore, a fan device 5 for flowing air in the vertical direction is installed in the space 11 of the resistor box 3 arranged at a substantially middle position in the height direction of the resistor box 3 group stacked and connected in the vertical direction.

[0095] Furthermore, the plurality of rod-shaped resistors 2 installed in the resistor box 3 are installed in the lateral direction of the resistor box 3, that is, in the left-right direction. Thus, an operating portion such as a control device 6 protruding outward can be provided on the surface in the front-to-back direction of the resistor box 3, thereby allowing an operator to easily operate the load resistor 4 of the present invention.

[0096] Furthermore, when it is necessary to inspect each resistor box 3 constituting the load resistor 4 or when each resistor box 3 fails, the resistor box 3 can be moved forward and backward, thereby making it easy to perform inspection or troubleshooting.

[0097] like Figure 1 and 2 As shown, a resistor case 3 is formed by arranging a plurality of stick resistors 2 using a stick resistor base 1 of the present invention in a substantially rectangular box-shaped resistor case.

[0098] For example, ten rod-shaped resistors 2 having the structure of the present invention described above are arranged in one resistor box 3 to form one resistor box 3 .

[0099] A current of 15V and 10A can flow through one rod-shaped resistor 2. Therefore, by connecting 10 rod-shaped resistors 2 in parallel, a resistor box 3 having a load of 15V and 100A can be formed. Furthermore, by connecting 30 of these resistor boxes 3 in series, a load of 450V and 100A can be formed, and a load resistor 4 capable of performing an electric power test of this load can be formed. In addition, by connecting 30 of these resistor boxes 3 in parallel, a load resistor 4 capable of performing an electric power test of 15V and 3000A can be formed.

[0100] Like according to Figure 1 , Figure 2 As can be understood, 30 resistor boxes 3 are stacked in 5 rows in the horizontal direction and 6 layers in the vertical direction to form the load resistor 4. Here, the number of resistor boxes 3 is not limited to 30, and can be changed according to the conditions of the load test.

[0101] Furthermore, compared with the conventional load resistor, the temperature of the periphery of the load resistor 4 only rises by about 60° C. in the load test. Furthermore, if air is blown toward the load resistor 4, the temperature can be further lowered.

[0102] Figure 1 , Figure 2 This is a specific example of assembling 30 resistor boxes 3 to form a predetermined load resistor 4, each resistor box 3 is formed in a substantially square shape. In addition, 10 rod-shaped resistors 2 are installed in layers at intervals on the upper side of the resistor box 3. The rod-shaped resistors 2 are installed in a manner such that their length direction faces the horizontal direction, that is, the left-right direction.

[0103] In addition, the lower side portion of each resistor box 3 is formed so as to form a space portion 11 into which wind enters, and air is introduced into the space portion 11 so that the air can swing in the space portion 11 .

[0104] In addition, in the resistor box 3 formed in a roughly cubic shape, there is no limitation on the volume ratio of the upper portion where the rod-shaped resistors 2 are installed and the space portion 11 which serves as the air inlet portion and the swing portion of the lower portion, but the design is such that the upper portion where at least a plurality of rod-shaped resistors 2 are installed is more than half of the volume ratio of the resistor box 3.

[0105] Here, the space 11 at the lower side also serves as a space for installing each small fan device 5. As shown in the figure, the small fan device 5 is in a square shape and is configured to be able to send air in the up-down direction.

[0106] Figure 1This is a diagram showing a load resistor 4 in which resistor boxes 3 are stacked in six layers, and a fan device 5 is mounted on the resistor box 3 in the third layer from the top.

[0107] However, among the load resistors 4 , there is no limitation as to which row of resistor boxes 3 in which stage the fan device 5 of the present invention is mounted.

[0108] Depending on the output voltage or output power capacity of the generator or other equipment undergoing the load test, or the conditions of the test site or the temperature of the test site, or other conditions, it is possible to select which layer and which column of the resistor box 3 the fan device 5 of the present invention is to be installed on.

[0109] when Figure 1 When the load resistor 4 in the figure is working, at its working level, if the heating temperature of the lowest resistor box 3 shown in the figure is about 30°C, it can be expected that the second resistor box 3 is about 40°C and the third resistor box 3 is about 50°C. Therefore, the fan device 5 is installed in the space portion of the fourth resistor box 3.

[0110] Then, the fourth layer resistor box 3 with the fan device 5 installed is cooled, and the temperature drops by about 60° C. When the fan device 5 is not installed, the temperature further rises to about 80° C., but when the fan device 5 is installed, the fourth layer resistor box 3 is cooled, and the temperature drops to about 60° C. as described above.

[0111] In addition, the temperature of the fifth layer resistor box 3 is about 70° C., and the temperature of the sixth layer resistor box 3 only rises to about 80° C. In contrast, when the fan device 5 is not installed, the temperature of the fifth layer resistor box 3 is about 100° C., and the temperature of the sixth layer resistor box 3 rises to about 150° C.

[0112] As such, the temperature of the resistor rises more rapidly as it rises to the upper layer. Therefore, it is extremely effective to provide the fan device 5 in the middle layer. This is because the resistor box 3 located at the lower side of the layer where the fan device 5 is provided is cooled by the air suctioned by the fan device 5, and the resistor box 3 located at the upper side of the layer where the fan device 5 is provided is cooled by the air extruded by the fan device 5. That is, the air generated in the up-and-down direction of the fan device 5 is used without waste for the cooling effect.

[0113] On the contrary, when the fan device 5 is provided at the bottom position of the load resistor 4, the wind can only reach the third or fourth layer of the resistor box 3. This is because the small fan device 5 has a small air supply output because a large-diameter fan cannot be used.

[0114] However, for example, if a fan device 5 is provided at a middle position of the resistor box 3 on the fourth layer, etc., the wind is discharged to the outside from above the resistor box 3 on the sixth layer, and the resistor boxes 3 on the fourth layer, the fifth layer, and the sixth layer can be cooled by the force of the wind. In addition, the resistor boxes 3 on the lower layers from the above-mentioned middle position can be cooled by the force of the inhaled wind.

[0115] Therefore, the temperature of the load resistor 4 constructed according to the present invention never rises to more than 100° C., and the load test can be safely performed even in a case where the load test can only be performed in a closed room, for example.

[0116] besides, Figure 2 The load resistor 4 of the present invention is shown in a plan view. The plurality of resistor boxes 3 are stacked in six layers and arranged in five rows.

[0117] Furthermore, in the resistor case 3 , ten rod-shaped resistors 2 are installed in the lateral direction, that is, in the left-right row direction, and a plurality of rod-shaped resistors 2 are installed in parallel at intervals in the front-rear direction of the resistor case 3 .

[0118] In this way, by installing the rod-shaped resistor body containing the rod-shaped resistor substrate 1 in the column direction and installing them in parallel with intervals in the front-to-back direction of the resistor box 3, it is possible to ensure installation space for installing the control device 6 etc. behind or in front of the load resistor 4, which is extremely efficient.

[0119] In the load resistor 4 of such a structure, the resistor box 3 can be moved forward or backward in advance to cope with a problem in the wiring of the rod-shaped resistor 2 or the like when the rod-shaped resistor 2 is broken or the rod-shaped resistor base 1 is stored therein. According to this structure, the replacement work caused by the failure of the rod-shaped resistor 2 and the failure of the wiring can be smoothly dealt with.

[0120] Here, there is no limitation on the structure for moving the resistor box 3 forward or backward. For example, a rail 7 is provided in the front or rear, and casters of the resistor box 3 are placed on the rail 7 so that the resistor box 3 can be moved smoothly.

[0121] exist Figure 2 In the example of FIG. 1 , in the load resistor 4 composed of 5 columns, only the second column and the fourth column from the left may be constructed so as to move back and forth. It is not necessary to construct so as to move all the columns back and forth.

[0122] For example, even if a failure occurs in the first row from the left, it is possible to enter the gap after the second row has moved and perform repair work.

[0123] Then, even if a failure occurs in the third row from the left, the third row can be repaired by entering the gap after the second row is moved or the gap after the fourth row is moved.

[0124] Furthermore, even if a failure occurs in the fifth row from the left, the fifth row can be repaired by entering the gap after the fourth row is moved.

[0125] Description of the label:

[0126] Reference numeral 1 denotes a rod-shaped resistor substrate;

[0127] Reference numeral 2 denotes a rod-shaped resistor;

[0128] Reference numeral 3 denotes a resistor box;

[0129] Reference numeral 4 denotes a load resistor;

[0130] Reference numeral 5 denotes a fan device;

[0131] Reference numeral 6 denotes a control device;

[0132] Reference numeral 7 indicates a track;

[0133] Reference numeral 8 denotes an insulating member;

[0134] Reference numeral 9 denotes a protective member;

[0135] Reference numeral 10 denotes a heat dissipation fin;

[0136] Reference numeral 11 denotes a space portion.

Claims

1. A load resistor, which receives power transmitted from a device and performs a power-on test on the device, characterized in that: The load resistor comprises: a rod-shaped resistor substrate, which generates heat by passing the electric power; a tubular protective member, which is inserted through the rod-shaped resistor substrate; a rod-shaped resistor body, which has an insulating member, and the insulating member is filled between the rod-shaped resistor substrate and the protective member; The rod-shaped resistor base is used by drawing a nickel-chromium alloy wire wound into a coil shape. A resistor box is formed in a substantially square shape, in which a plurality of rod-shaped resistors formed using the above-mentioned rod-shaped resistor substrate are connected in parallel and in series; In the above-mentioned substantially square resistor box, the above-mentioned plurality of rod-shaped resistors are installed at the upper part starting from the substantially middle position in the longitudinal direction, and a space portion is provided at the lower part starting from the substantially middle position in the longitudinal direction; A plurality of the resistor boxes can be connected horizontally and / or vertically, so that load tests can be performed on the above-mentioned devices with different power output capacities; A fan device for flowing air in the up-down direction is installed in the resistor box space portion arranged at a substantially middle position in the height direction of the resistor boxes connected in the longitudinal direction.

2. A load resistor that receives power transmitted from a device and performs a power-on test on the device, characterized in that: The load resistor includes: a rod-shaped resistor base body, which generates heat by passing the electric power; a tubular protective member, which is inserted through the rod-shaped resistor base body; and a rod-shaped resistor body having an insulating member filled between the rod-shaped resistor base body and the protective member. The rod-shaped resistor base is used by stretching a nickel-chromium alloy wire wound in a coil shape by more than two times. A resistor box is formed in a substantially square shape, in which a plurality of rod-shaped resistors formed using the above-mentioned rod-shaped resistor substrate are connected in parallel and in series; In the above-mentioned substantially square resistor box, the above-mentioned plurality of rod-shaped resistors are installed at the upper part starting from the substantially middle position in the longitudinal direction, and a space portion is provided at the lower part starting from the substantially middle position in the longitudinal direction; A plurality of the resistor boxes can be connected horizontally and / or vertically, so that load tests can be performed on the above-mentioned devices with different power output capacities; A fan device for flowing air in the up-down direction is installed in the resistor box space portion disposed at a substantially middle position in the height direction of the resistor boxes connected in the longitudinal direction.

3. A load resistor for receiving power transmitted from a device to conduct a power-on test on the device, characterized in that: The load resistor includes: a rod-shaped resistor base body, which generates heat by passing the electric power; a tubular protective member, which is inserted through the rod-shaped resistor base body; and a rod-shaped resistor body having an insulating member filled between the rod-shaped resistor base body and the tubular protective member. The above-mentioned rod-shaped resistor base uses an iron-chromium wire in a straight state. In the iron-chromium wire, the amount of nickel in the nickel-chromium heat-resistant alloy wire is reduced, and the nickel-chromium alloy is replaced by iron accounting for several tens of percent. A resistor box is formed in a substantially square shape, in which a plurality of rod-shaped resistors formed using the above-mentioned rod-shaped resistor substrate are connected in parallel and in series; In the above-mentioned substantially square resistor box, the above-mentioned plurality of rod-shaped resistors are installed at the upper part starting from the substantially middle position in the longitudinal direction, and a space portion is provided at the lower part starting from the substantially middle position in the longitudinal direction; A plurality of the resistor boxes can be connected horizontally and / or vertically, so that load tests can be performed on the above-mentioned devices with different power output capacities; A fan device for flowing air in the up-down direction is installed in the resistor box space portion disposed at a substantially middle position in the height direction of the resistor boxes connected vertically.

4. The load resistor according to any one of claims 1 to 3, characterized in that: The fan device can be mounted in a space portion of the resistor box disposed at any position.

5. The load resistor according to claim 4, characterized in that In the resistor box, a plurality of rod-shaped resistors are installed in a lateral direction of the resistor box, and an operating portion can be provided on a surface in the front-rear direction of the resistor box; When inspecting or troubleshooting the resistor box, the resistor box can be moved forward and backward to perform inspection or troubleshooting operations.

6. The load resistor according to claim 5, characterized in that The resistor box is moved forward and backward by causing casters attached to the resistor box to run on rails.

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