JPH0466083B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a liquid resistor, for example, a high voltage liquid resistor used as a load device when performing a load test on electrical equipment such as a generator. It is related to the device.

[Conventional technology]

An example of a conventional device of this kind is shown in FIGS. 10 and 11, and the conventional device will be described below based on these figures. Note that FIG. 10 is an overall front view showing the entire apparatus, and FIG. 11 is an enlarged sectional view taken along the - line in FIG. 10.

In the figure, reference numeral 1 denotes a liquid tank for storing liquid for obtaining resistance, 2 is a plate-shaped electrode that is taken in and out of the liquid tank 1, and 3 is an insulator that fixes the three-phase electrode 2. Further, A is the liquid level, and B is the gap between the electrode 2 and the liquid tank 1.

Next, the operation of this conventional device will be explained.

Electrodes 2 arranged in an equilateral triangular shape on the center of the liquid tank 1 and facing each other;
is taken in and out of the liquid level A of the liquid tank 1 according to a predetermined load.

[Problem that the invention seeks to solve]

Conventional load test equipment is configured as described above, so at high voltages such as 11kV, in order to obtain the specified load, it is necessary to prevent the specific resistance value of the liquid from decreasing due to the temperature rise of the liquid. To,
It is necessary to uniformly and considerably widen the gap B between the electrodes 2 and between the electrode 2 and the liquid tank 1, resulting in a problem that the liquid tank 1 becomes larger.

This invention was made in order to solve the above-mentioned problems, and it suppresses the temperature rise of the liquid in the liquid tank 1 and suppresses the electric field in the radial direction of the high voltage electrode to a low value. Therefore, it is an object of the present invention to provide a liquid resistor device which can stably obtain a predetermined load and which can also be made smaller.

[Means for solving problems]

In the liquid resistor device according to the present invention, high-voltage electrodes are arranged approximately in the center, and cylindrical tanks for storing liquid for obtaining resistance are installed in the same number as the high-voltage electrodes to form sub-tanks. The liquid is forced to flow, and the high-voltage electrode is moved in and out of the cylindrical sub-tank in the axial direction of the cylindrical sub-tank depending on the load.

[Effect]

The cylindrical sub-tank of the present invention suppresses the electric field in the radial direction of the high-voltage electrode to a low level by moving the high-voltage electrode in and out in the axial direction of the cylindrical sub-tank according to a predetermined load, thereby suppressing the temperature rise of the liquid. to the minimum and prevent changes in the specific resistance of the liquid.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment thereof.

FIG. 1 is an overall front view of the liquid resistor device of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. 1
It is an enlarged sectional view along the - line of a figure.

In FIGS. 1 to 4, reference numeral 4 is composed of three tanks 4a, 4b, and 4c installed in the liquid tank 1, and the upper and lower ends of each tank 4a, 4b, and 4c are cut. Notches 4d and 4e are formed and are sub-tanks for storing liquid. 5
is each tank 4a, 4b, 4c of this sub tank 4
A nozzle 7a for spraying and distributing liquid to the nozzle 5 is a valve installed in a pipe that supplies liquid to the nozzle 5, and constitutes a distribution device 7 together with the nozzle 5, the valve 7a, a flow meter 24, and a pipe 25, which will be described later. are doing. Also, number 3 is an insulator. 8 is an insulating cylinder supported by the two insulators 3 in the axial direction of the sub-tank 4, and 9 is an approximately cylindrical high voltage which is raised and lowered in order to obtain a predetermined load within this insulating cylinder 8. 10 is an electrode mounting bracket for attaching the high-voltage electrode 9 to the four insulators 3 insulating it; 11 is a guide wheel connected to both ends of the four insulators 3; and 12 is a guide wheel having wheels; A post is vertically attached to the liquid tank 1 in order to slide the guide wheel 11, 13 is a hanging fitting for suspending the high voltage electrode 9 attached to the insulator 3, 14 is a pulley, and 15 is a A wire rope connected to the hanging fitting 13 through this pulley 14, 16 a drum for winding this wire rope 15, 17 a spur gear fixed to this drum 16, 18 a pinion that meshes with this spur gear 17,
19 is a reducer motor with a brake; 20 is a limit switch that detects the upper and lower limits of the high voltage electrode 9; 21 is a dog fixed to the wire rope 15; and 22 and 23 are liquids attached to the liquid tank 1. This is a discharge pipe. Also,
24 is a flow meter connected to the valve 7a;
25 is a pipe connecting this flow meter 24 and the nozzle 5. In addition, 26 is a cable on the load side, 27 is a terminal board for connecting this cable 26,
A lead wire 28 connects the terminal plate 27 and the high voltage electrode 9. Furthermore, 30 is a temperature measuring resistor for detecting a temperature rise during a liquid load test, and 31 is a drain valve for draining the liquid.

Next, we will discuss sub-tank 4 in detail in Figures 5 to 8.
This will be explained using figures.

FIG. 5 is a plan view of the sub-tank 4 alone, FIG. 6 is an enlarged sectional view taken along the - line in FIG. 5, FIG. 7 is a bottom view of FIG. 5, and FIG. FIG.

In the figure, the tanks 4a, 4b, 4c are each constructed separately in order to make the three high voltage electrodes 9 each phase independent structure, and 33 is provided at the upper end of each tank 4a, 4b, 4c with the above-mentioned insulating material. This is an insulator mounting plate for attaching the insulator 3 that supports the cylinder 8 in the cylinder axis direction of the tanks 4a, 4b, 4c. 34 is a fixing plate for fixing the tanks 4a, 4b, 4c.

Next, details of the insulating cylinder 8 and the high voltage electrode 9 will be explained with reference to FIG.

FIG. 9 is a front view of the insulating cylinder 8, in which reference numeral 35 has a tapered end, is inserted below the liquid level A, and has a high voltage electrode 9. An insulated pipe is inserted so as to be able to slide up and down, 36 is an insulated branch pipe fixed to this insulated pipe 35, and 37 is connected to the insulated pipe 35 to which this insulated branch pipe 36 is attached to the cylindrical axis of the sub-tank 4. The insulating flange is an insulating flange for attaching in the direction, and the insulating tube 8 is constituted by these flanges.

One embodiment of the liquid resistor device of the present invention is constructed as described above, and its function and operation will be explained below.

Valve 7 of liquid distribution device 7 to obtain resistance
It flows in from a and is ejected from the nozzle 5. Here, the tip of the nozzle 5 branched into each sub-tank 4a, 4b, 4c is installed upward under each high-voltage electrode 9 so as to face each high-voltage electrode 9, as shown in each figure. has been done. Therefore, the liquid is injected from the nozzle 5 onto the tip of each high-voltage electrode 9 . As a result, the liquid in the portion that is in contact with the surface of each high-voltage electrode 9 is moved intensively, and an increase in the ambient temperature of each high-voltage electrode 9 is efficiently suppressed. Further, the flow rate is adjusted by the valve 7a according to the capacity of the load.

Next, the liquid injected from the nozzle 5 is stored in the sub-tank 4, and flows from the notch 4d of each tank 4a, 4b, 4c without overflowing into the tanks 4a, 4b, 4c of each phase of this sub-tank 4. Liquid tank 1
is discharged to. When this discharged liquid exceeds a certain amount, it is discharged from the discharge pipes 22 and 23 and either collected or discarded. In this way, the liquid is forced to flow, cooling around the high voltage electrode 9,
Prevents temperature rise of liquid.

Next, the load capacity is determined by the protruding length of the high-voltage electrode 9 that is taken in and out of the insulating tube 8 whose end is submerged in the liquid; the longer it protrudes from the insulating tube 8, the greater the load. The capacity can be increased, and the shorter the length protruding from the insulating cylinder 8, the smaller the load capacity. Therefore, in order to obtain a predetermined load, the high voltage electrode 9 is moved in and out of the insulating cylinder 8 in the liquid of the sub-tank 4 to obtain the desired load.

Incidentally, during the load test, the temperature of the liquid around the high voltage electrode 9 is detected by the temperature measuring resistor 30, and the high voltage electrode 9 is moved up and down so as to obtain a predetermined load.
Further, the flow rate of the liquid is detected by the flow meter 24, and the high voltage electrode 9 is moved up and down. Along with this, the specific resistance value of the liquid changes due to the rise in temperature, so the liquid flow rate is adjusted by the valve 7a to bring the specific resistance value of the liquid to a predetermined value.

In the above embodiment, the high-voltage electrode 9 was put in and taken out of the fixed insulating tube 8 according to the load capacity, but even if the high-voltage electrode 9 is fixed and the insulating tube 8 is moved up and down, the You can expect to get a load. Further, an electrode in which only a part of the high voltage electrode 9 is coated with an insulating resin may be used, and the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

As described above, the liquid resistor device of the present invention is
Each high-voltage electrode is inserted into an insulated cylinder so that it can slide back and forth, and a sub-tank is provided for each high-voltage electrode in the liquid tank, and the liquid is forced to flow through these sub-tanks. The electric field in the radial direction of the electrode can be controlled to a low value, and a predetermined load can of course be stably obtained, and the liquid tank can be made more compact. In addition, since the liquid is injected to each high-voltage electrode by the nozzle installed in each sub-tank, it is possible to balance the flow rate of the liquid in each sub-tank, and evenly distribute the liquid around each high-voltage electrode. Rather than moving the electrode, the liquid in contact with the surface of the protruding part from the insulating cylinder is moved intensively, making it possible to efficiently control the rise in ambient temperature of each high voltage electrode and achieve three-phase balance. It also has the effect of being able to.

[Brief explanation of the drawing]

1 is an overall front view showing a liquid resistor device according to an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. The figure is an enlarged sectional view taken along the - line in FIG. 1, and FIG. 5 is a plan view showing the configuration of the sub-tank 9.
Figure 6 is an enlarged sectional view taken along the - line in Figure 5, Figure 7 is a bottom view of Figure 5, and Figure 8 is viewed from arrow C in Figure 5.
9 is a front view showing the related structure of the insulating tube 8 and the high voltage electrode 9, FIG. 10 is an overall front view showing a conventional load test device, and FIG.
It is an enlarged sectional view along the - line of a figure. 1...Liquid tank, 4...Sub tank, 4a, 4b,
4c...tank, 4d...upper notch, 4e...
Lower notch, 5... Nozzle, 7... Distribution device, 7
a... Valve, 8... Insulating cylinder, 9... High voltage electrode,
24...Flowmeter, 25...Piping, 35...Insulated pipe, 36...Insulated branch pipe, 37...Insulated flange. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A plurality of cylindrical sub-tanks provided in a liquid tank and storing liquid for obtaining resistance, and a plurality of cylindrical sub-tanks arranged approximately in the center of each of these sub-tanks in the axial direction thereof. an insulating cylinder, a plurality of high-voltage electrodes that are slidably inserted into each of these insulating cylinders and inserted into and taken out from the liquid from the ends of each of the insulating cylinders, and a plurality of high-voltage electrodes that face each of these high-voltage electrodes. has a nozzle that is installed facing upward almost directly below each of the high-voltage electrodes in each of the sub-tanks and injects the liquid at the tip of each of the high-voltage electrodes, and forcibly circulates the liquid into each of the sub-tanks. A liquid resistor device comprising a flow device.