JPH0468504A - Water rheostat for electric load test - Google Patents

Abstract

PURPOSE:To drain water between electrode plates effectively to prevent water temperature from rising remarkably and to acquire highly reliable measurement data by providing a water supply part to an inner bottom part of a water tank and by providing a spray port formed in the water supply part below a space between a plurality of electrode plates. CONSTITUTION:Water delivered to a water supply pipe 46 is supplied into a water supply part 50 through a water supply pipe 46, made confluent to average a water pressure and sprayed out toward water surface direction of water 12 from a spray port 52. Since an opening area of the spray port 52 is formed larger than that whereto a pipe opening area of water supply pipes 46, 46 is added, the sprayed water can be sprayed out in water surface direction more slowly than a flow rate of water which passes through the water supply pipe 46. Since the spray opening 52 positions below an electrode plates space 53, the sprayed out water passes through the space 53 from a lower part of the space 53 and is pushed up to the water surface direction. Water attained the water surface flows radially on the water surface, is sucked by a drain pipe 48 and drained from the drain pipe 48 to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a water resistor for electrical load testing, and more particularly to a water resistor for electrical load testing used in power load testing of generators.

[Conventional technology]

Conventionally, in this type of water resistor for electrical load testing, as shown in FIG. 5, water 12 is poured into a water tank 10, and electrodes 14.1G and 18 are immersed in the poured water 12. Premeter electrode 14
．． 16, 18 are shaped like rods and are arranged at equal intervals and are connected to the circuit breaker 26 via cables 20, 22, 24, respectively. This circuit breaker 26 connects cables 28.30.
32 to each output end of a generator 34.

Further, a prime mover 36 is connected to the generator 34 .

Therefore, the generated electricity from the generator 34 flows through the respective cables to the electrodes 14, 16, 18, thereby using the water 12 as an electrical resistor to the electrodes 14, 16, 18.
．． A current flows between the 18. Then, the electrode 14
．． By appropriately changing the immersion depth of 16.18, the electrical resistance value in the water 12 is increased or decreased, and the load current of the generator 34, that is, the load power is adjusted.

However, in actual electrodes, since the generator current ranges from several hundred to several thousand amperes, electrode plates 38, 40, 42 whose cross section is bent into a dogleg shape as shown in Fig. 6 are usually used. Ru. The electrode plates 38, 40, 42 are fixed at regular intervals so that their inner surfaces face each other, and are connected to a suspension device (not shown) via insulating lobes 44. By lifting and suspending the electrode plate 38.40.42 via the lobes 44 by means of this suspension device, the immersion depth of the electrode plate 38.40.42 can therefore be varied.

By the way, since all of the load power of the generator 34 is applied to the water 12, which is an electrical resistor, the temperature of the water 12 increases.

When the water temperature rises, the water 12 boils, so in order to prevent the water from boiling, it is necessary to appropriately supply and drain the water 12 in the water tank 10. Therefore, as shown in FIG. 6, the water supply pipe 46 is connected to the lower side of the water tank 10.
Water is supplied into the water tank 10 from the water tank 10, and the water 12 whose water temperature has increased can be drained from a drain pipe 48 connected to the upper side of the water tank 10. Note that the water supply pipe 4B is connected to the water tank 1.
The reason why it was provided at the bottom of the side of the water tank 10 was to prevent the generation of air bubbles, as it has been found that air bubbles generated by supplying water from above the water tank 10 have a negative effect on the reliability of measurement data. be.

[Issues that Hathu tries to solve]

However, in the conventional water resistor for electrical load testing, a part of the water supplied from the water supply pipe 46 is drained from the lower part of the gap between the electrode plates 49 to the bottom of the gap between the electrode plates 49 as shown by the arrow in FIG.
The water passes through the water, flows toward the water surface, and is drained from the drain pipe 48. However, it has been found that most of the supplied water does not flow in this direction below the electrode plate space 49, as shown by the arrow in the figure, but flows directly in the direction of the drain pipe 48. Therefore, it becomes difficult for water to flow between the electrode plates 49, which is the part where the water temperature increases most, so the water temperature in that part increases significantly from 70°C to 80°C, and bubbles are actively generated. Since the generated bubbles are poor conductors, they change the contact area between the electrodes 40, 42 and the water 12 and the electrical resistance value of the water, and adversely affect the measured data.

In other words, the current flowing in the water becomes unstable, and combined with the uneven generation of bubbles, pulsations occur in the current in each layer, causing an error of 10% or more in the measured data. The drawback is that it lacks reliability.

The present invention was developed in view of the above circumstances, and is a water resistance tester for electrical load tests that efficiently drains water between electrode plates, prevents a significant rise in water temperature, and obtains highly reliable measurement data. The purpose is to provide equipment.

[Means to solve problems]

In order to achieve the above object, the present invention provides a water tank (10) in which water (12) is stored, and a water tank (12) that is connected to a generator and that is connected to the water tank (12) at a predetermined interval. A plurality of electrode plates (38, 40, 42) to be immersed and the water tank (
10), a water supply section (50) that supplies water (12) to the water tank (10), and a drainage section (48) that drains the water (12) from the water tank (10). A water supply part (50) is installed at the inner bottom of the water tank (10), and a water fountain (52) formed in the water supply part (50) is provided below between the plurality of electrode plates (53). It is characterized by

[Effect]

According to the present invention, the water supply section (50) is installed at the inner bottom of the water tank (10), and water is supplied into the water tank (10) from the water fountain (52) of the water supply section (50).

Since the water fountain (52) is located below the plurality of electrode plates (53) immersed in the water tank (10), the water spouted from the water fountain (52) flows between the electrode plates. 53), flows toward the water surface by passing between the electrode plates (53),
Also, the water that reaches the water surface flows radially on the water surface and is drained! Water is absorbed by (48) and drained to the outside. As a result, the water between the electrode plates (53) is efficiently drained, so that a significant rise in water temperature can be prevented.

〔Example〕

Preferred embodiments of the water resistor for electrical load testing according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of a water resistor for electrical load testing according to the present invention, and the same or similar members as those in the conventional example shown in FIGS. 5 to 7 are designated by the same reference numerals. I will explain it by attaching it.

According to FIG. 1, a water supply section 50 is installed at the inner bottom of the water tank 10. As shown in FIG. 2, the water supply section 50 is arranged at the center of the inner bottom of the water tank 10, and has a water fountain 52 formed on its upper surface.

This water fountain 52 is located below the electrode gap 53 formed between the electrode plates 38, 40, 42.

The water supply section 50 is connected to the water supply pipe 4 as shown in FIGS. 1 and 2.
6.46 will be communicated. The water supply pipe 46 communicates with a side opening of the water supply section 50 through an opening formed at a lower side of the water tank 10 .

Therefore, water fed through the water supply pipe 46 is supplied into the water supply section 50. Further, the opening area of the water fountain 52 is larger than the sum of the opening areas of the two water supply pipes 46 and 46.

Next, the operation of the first embodiment of the electrical load test water resistor constructed as described above will be explained.

First, the water sent to the water supply pipe 46 is supplied into the water supply section 5Q via the water supply pipe 46. The water supplied into the water supply section 50 is combined within the water supply section 5Q, the water pressure is averaged, and the water is ejected from the water fountain 52 toward the surface of the water 12. The water that is spouted out has an opening area of the water fountain 52 that is larger than the water supply pipe 4.
6.Since it is wider than the sum of the pipe opening areas of 46, the water supply pipe 46;! The water is ejected toward the water surface at a slower rate than the water flow rate of Aa. Furthermore, since the water fountain 52 is located below the electrode plate M53, the spouted water passes through the gap between the electrode plates 53 from the lower part of the gap between the electrode plates 53 as shown by the arrow in the figure. , pushed up toward the water surface. The water that has reached the water surface flows radially on the water surface, is absorbed by the drain pipe 48, and is drained to the outside from the drain pipe 48.

That is, when the water spouted from the water fountain 52 passes between the electrode plates 53, it is heated by each of the electrode plates 38, 40, 42 and the water temperature rises.
The water continuously sent from 2 is forcibly pushed out in the direction of the drain pipe 48. Therefore, the water between the electrode plates 53 can be drained efficiently.
It is possible to prevent a significant rise in water temperature. Specifically, in conventional water resistors for electrical load tests, the water temperature is 70°C.
However, in this example, it was found that the water temperature could be kept below 50°C.

Further, the water spouted from the water fountain 52 is transmitted to the water supply section 5.
Since the water pressure is averaged within 0, the water is evenly sprayed out between the electrode plates 53. As a result, variations in water temperature within the electrode plate 1'l/153 can be prevented, and uneven generation of air bubbles within the electrode plate space 53 can be prevented.

As explained above, according to this example, it is possible to prevent a significant rise in water temperature and uneven generation of bubbles, and therefore it has been found that the error in measurement data can be suppressed to 2% or less.

FIG. 3 shows the second water resistor for electrical load tests according to the present invention.
An example is shown.

According to FIG. 3, a plurality of deflection plates 54, 56 are attached to the water fountain 52 of the water supply section 50 in a grid pattern as shown in FIGS. 3 and 4. Further, the water supply section 50 is communicated with a square-shaped water supply pipe 58 attached to the bottom opening of the water tank 10. The deflection plates 54 and 56 are rotatably supported at both ends thereof. Therefore, by appropriately rotating the deployment direction plates 54 and 56 to change the direction of the deflection plates, the direction in which water is spouted from the water fountain 52 can be adjusted as appropriate. Therefore, direct each deflection plate 54, 56 in the direction where the water temperature increases the most, that is, the direction between the electrode plates 53 shown in FIG.
By doing so, water from the water fountain 52 is directed between the electrode plates 5.
It can be focused and ejected in three directions. Thereby, the water between the electrode plates 53 can be forcibly drained.

:Effects of the Invention As explained above, according to the water resistor for electrical load testing according to the present invention, the water supply part is provided at the inner bottom of the water tank, and the water from the fountain formed in the water supply part is distributed between the electrode plates. The water passes between the electrode plates and is ejected from the bottom towards the water surface, efficiently and forcibly draining the water between the electrode plates, thereby preventing a significant rise in water temperature and uneven generation of bubbles. can.

Therefore, stable measurement data can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the water resistor for electrical load testing according to the present invention, FIG. 2 is a top view of FIG. 1, and FIG. 3 is a water resistor for electrical load testing according to the present invention. A sectional view showing the second embodiment of the vessel, the fourth lever is a top view in FIG. 3, and the fifth
The figure is an explanatory diagram showing the first embodiment of the conventional water resistor for electrical load tests, and FIG. 6 is the second embodiment of the conventional water resistor for electrical load tests.
FIG. 7, which is a perspective view showing an embodiment, is an explanatory diagram showing the flow direction of water supplied to a conventional water resistor for electrical load testing. 10... Water tank, 38.40.42... Electrode plate, 46... Water supply pipe, 48... Drain pipe, 50...
・Water supply part, 52... Fountain, 54.56... Deflection plate. Applicant Hitachi Plant Construction Co., Ltd. District Map

Claims (1)

[Scope of Claims] A water tank in which water is stored, a plurality of electrode plates connected to a generator and immersed in water in the water tank at predetermined intervals, and a water supply unit that supplies water to the water tank. and a drainage part for draining water from the water tank, the water supply part is installed at the inner bottom of the water tank, and the water fountain formed in the water supply part is connected to the water supply part. A water resistor for electrical load testing characterized by being provided below between a plurality of electrode plates.