JPH08321408A - Water rheostat - Google Patents

Abstract

PURPOSE: To provide a water rheostat by which the magnitude of load current can be changed. CONSTITUTION: A water rheostat body 9 is comprised of a tank l filled with water in which cylindrical electrodes 2r, 2s and 2t are immersed, and it is further provided with a first flow regulating valve 6 which allows a water to directly flow from a water supply source 11 to the tank 1 and second flow regulating valves 3 and 13 which allow a water to indirectly flow to the tank 1 by means of a pure water means 4 for increasing the specific resistance of water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water resistor used for load test of a high voltage generator.

[0002]

2. Description of the Related Art When a high-voltage generator or a high-voltage extra-high-voltage generator is subjected to a load test, generally in Japan, the power supply systems are operated in parallel at a power plant and used as a load. However, in Southeast Asia, there are many cases where the high voltage generator is a single facility because of the system. Therefore, a water resistor is used as a pseudo load facility that plays a role as a load.

Cooling water is stored in the tank forming the water resistor, and the electrodes are immersed in the cooling water to heat the cooling water, so that the heated water flows out and new water flows in. Has become.

There are two types of water resistors, one having a cylindrical electrode and the other having a plate-like electrode. Since the one having a plate-like electrode has a risk of boiling water in the extreme part due to heating of the extreme part, Those having a cylindrical electrode are often used.

[0005]

However, in the case of a water resistor using a cylindrical electrode, when the load current fluctuates due to the specific resistance (ρ) of the local water and the specific resistance (ρ) of the local water is low. It is difficult to manufacture a water resistor with a small capacity because the load current flows too much.

[0006] Therefore, the present invention has an object to provide a water resistor which solves such a problem.

[0007]

[Means for Solving the Problems] The structure of the present invention for achieving the above object is to construct a water resistor main body by immersing a cylindrical electrode in a tank storing water, and A first pipe for directly sending water into the tank is provided and a first flow rate adjusting valve is provided in the first pipe, and a water supply source and the tank are provided through pure water means for increasing the specific resistance of water. Are connected by a second pipe, and a second flow rate adjusting valve is provided in the second pipe.

[0008]

[Function] The water having a small specific resistance such as tap water and the water having a large specific resistance obtained by treating this water with pure water means are mixed and allowed to flow into the tank of the water resistor body. The specific resistance of water can be adjusted within the range of the specific resistance of both waters by changing the mixing ratio of both waters. Therefore, it is possible to easily obtain a water resistor having a small capacity.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

The construction of the water resistor according to the present invention is shown in FIG. As shown in the figure, a tank 1 which constitutes the water resistor body 9 is provided, and three cylindrical electrodes 2r, 2s, 2t are immersed in the tank 1. These three cylindrical electrodes 2r, 2
s and 2t are arranged at the vertices of an equilateral triangle when viewed from above so that the intervals between the phases are equal, and are connected to a generator (not shown) for each phase.

On the other hand, a supply source 11 for supplying cooling water is directly connected to the tank 1 via a common pipe 10, a first pipe 7 and a common pipe 8. The first pipe 7 has a first flow rate adjusting valve 6
Is provided. The pure water means 4 is connected between the common pipe 10 and the common pipe 8. That is, the common pipe 10,
The pure water means 4 is provided between the second pipes 12 and 5 connected to 8. The second pipes 12 and 5 are provided with second flow rate adjusting valves 3 and 13, and the second pipe 12 is provided with a replaceable filter 24 and a flow meter 25. An outlet 26 is formed in the upper part of the tank 1 so that the cooling water that directly or indirectly flows into the tank 1 from the supply source 11 maintains a constant height.

Next, the structure of the pure water means 4 will be described. The pure water means 4 comprises a cylinder 15 on a concrete foundation 14 as shown in FIG.
As shown in Fig. 3 (e), the second pipe 5
The lower surface 16 of the cylinder 15 is closed by a lower lid 16 having a hole 16a for connecting a plurality of holes 18a, and a plurality of holes 18a shown in FIG. The filter mount 18 having the above is mounted, three meshes (not shown) made of SuS60 are mounted thereon, and the mesh is filled with a particulate ion exchange resin 19 whose trade name is Amberlite (MB-2). Is. And
In order to allow the exchange of the ion exchange resin 19, the ring-shaped support base 2 shown in FIG.
0 are joined, a plurality of tap holes 20a are formed on the inner peripheral side of the support 20, and bolts 21 are screwed into the tap holes 20a from bottom to top. Support base 2
An upper lid 22 having a hole 22a for connecting the second pipe 12 and an insertion hole 22b formed at a position corresponding to the tap hole 20a is placed on 0, and is inserted into the insertion hole 22b to project upward. The upper lid 22 is coupled to the support base 20 by screwing the nut 23 into the bolt 21 that operates.

The cylinder 15, the lower lid 16, the support stand 17, the filter mounting stand 18, the support stand 20, in the pure water means 4 described above,
The bolt 21, the nut 23, and the upper lid 22 are made of vinyl chloride, and the cylinder 15 and the lower lid 16, the support stand 17, and the support stand 20 and the support stand 20 and the bolt 21 are joined by welding. An O-ring (not shown) is provided between the support base 20 and the upper lid 22.

Next, the operation of such a water resistor will be described. First, the operation of the pure water means 4 will be described. When the cooling water flows into the inside of the cylinder 15, ionized potassium, calcium and the like in the cooling water are adsorbed by the granular ion exchange resin 19 and removed. Therefore, when it flows into the cylinder 15,
The specific resistance (ρ), which was 2000 to 5000 Ω-cm at 0 ° C., becomes about 50,000 Ω-cm when flowing out.
The pure water means 4 can process 3 m ³ of water per hour, and the ion exchange resin 19 can be replaced by turning the nut 23 and removing the upper lid 22.

Some pure water means are commercially available, and the processing capacity is the same as that of the pure water means 4, and the specific resistance (ρ) after the treatment is 10 times that of the pure water means 4 and has a high purity of 500000Ω-cm. However, since the price is 100 times as high as that of the pure water means 4, it is difficult to adopt.

When the flow rate adjusting valves 3, 6, 13 are opened to allow the cooling water to flow directly from the supply source 11 or indirectly through the pure water means 4 into the tank 1, industrial water or tap water that flows directly Water with a specific resistance (ρ) of 2000 to 50
Those having a resistance of 00 Ω-cm and those having a specific resistance (ρ) of about 50,000 Ω-cm increased by pure water means continuously flow into the tank 1 to be mixed. Therefore, the specific resistance (ρ) of water in the tank 1 can be adjusted within the range of 2000 to 50,000, and the specific resistance (ρ) is about 10,000 so that the load test of the small and medium capacity generator can be performed. It can also be adjusted to. That is, even if the specific resistance (ρ) of water is small, the specific resistance (ρ) can be increased to reduce the flow amount of the load current by using the water resistor according to the present invention, for example, 6.6 KV 1000 KVA (800 KW). ) Class or 6.6KV 2000KVA (1600KW) class medium and small capacity water resistor.

In FIG. 1, the cooling water heated by the cylindrical electrodes 2r, 2s, 2t is discharged from the outlet 26,
For example, a cooling tower may be provided, and after the water discharged from the outlet 26 is cooled by the cooling tower, it may be returned to the supply source 11 again and circulated for use.
In this case, the life of the ion exchange resin 19 is extended, which is advantageous.

[0018]

As can be seen from the above description, according to the water resistor of the present invention, the water resistor body and the pure water means are combined, so that the specific resistance of the water used in the water resistor body is increased or decreased by adjustment. Can be made. Therefore, for example, the specific resistance can be increased to prevent the load current from flowing too much, and the load test of the small-to-medium-sized generator can be enabled.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a water resistor according to the present invention.

FIG. 2 is a configuration diagram of pure water means in the water resistor according to the present invention.

FIG. 3 is a plan view showing components of pure water means in the water resistor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tank 2r, 2s, 2t ... Cylindrical electrode 3,6,13 ... Flow control valve 4 ... Pure water means 5,12 ... Second pipe 7 ... First pipe 9 ... Water resistor main body 11 ... Supply source

Claims (1)

[Claims] 1. A water-resistor body is constructed by immersing a cylindrical electrode in a tank in which water is stored, and a first pipe for sending water directly from a water supply source to the tank is provided. While the pipe is provided with the first flow rate adjusting valve, the water supply source and the tank are connected by the second pipe through the pure water means for increasing the specific resistance of water, and the second flow rate adjusting valve is provided in the second pipe. A water resistor characterized by being provided.