JPH0570284B2 - - Google Patents

Description

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

[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 XI-XI in FIG. 10.

In the figure, numeral 1 is a liquid tank that stores liquid for obtaining resistance, 2 is a plate-shaped electrode that is output and inserted into 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 //kv, in order to obtain a predetermined load, due to the temperature rise of the liquid,
In order to prevent the specific resistance value of the liquid from decreasing, it is necessary to uniformly widen the gap B between the electrodes 2 and between the electrode 2 and the liquid tank 1,
Therefore, there was a problem that the liquid tank 1 became large.

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]

The liquid resistor device according to the present invention includes a sub-tank in which high-voltage electrodes are arranged approximately at the center of each liquid tank 1 and cylindrical tanks each having the same number of cylindrical tanks as the high-voltage electrodes for storing liquid for obtaining resistance. At the same time, the liquid is forced to flow independently into each tank.

[Effect]

The cylindrical sub-tank arranged in the liquid tank 1 according to the present invention relaxes the electric field in the radial direction of the plural high-voltage electrodes by moving the plurality of high-voltage electrodes in and out in the cylindrical axial direction of the sub-tank according to a predetermined load. By adjusting and changing the length of the high-voltage electrode in the liquid in each tank and the liquid flow rate for each tank, it is possible to adjust the load steplessly from a three-phase balanced load to a three-phase unbalanced load.

〔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. FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1;

1 to 4, reference numeral 4 indicates three tanks 4a, 4b, 4 installed inscribed in the liquid tank 1.
c, each tank 4a, 4
Notches 4d, 4e at the upper and lower ends of b, 4c
This is a sub-tank which is formed within the liquid tank 1 and stores liquid. 5 is this subtamp 4
This nozzle 5 is a nozzle that injects and distributes liquid into each tank 4a, 4b, 4c, and the nozzle 5 is branched at the blowing end side into three branch pipes 5a each having an opening at the tip. 6 is an individual valve provided in the three branch pipes 5a to adjust the flow rate of the liquid to be injected; 7a is a valve provided in the pipe that supplies liquid to the nozzle 5; 5a, individual valves 6, valves 7a, a flow meter 24, and piping 25, which will be described later, constitute a distribution device 7. 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. The electrode 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 has wheels; 12 is this guide wheel 1;
1 is a support vertically attached to the liquid tank 1 for sliding it; 13 is a hanging fitting for suspending the high voltage electrode 9 attached to the insulator 3; 14 is a pulley; 15 is the pulley 14; A wire rope connected to the hanging fitting 13 through the wire rope, 1
6 is a drum for winding this wire rope 15;
17 is a spur gear fixed to this drum 16, 18
is a pillaron that meshes with this spur gear 17, 19 is a reduction gear motor with a brake, and 20 is the above-mentioned high voltage electrode 9.
a limit switch that detects the upper and lower limits of
21 is a dog fixed to the wire rope 15, and 22 and 23 are liquid discharge pipes attached to the liquid tank 1. Further, 24 is a flow meter connected to the valve 7a, and 25 is a pipe connecting this flow meter 24 and the nozzle 5. In addition, 26 is the cable on the load side, 27
is a terminal plate for connecting this cable 26, and 28 is a lead wire for connecting this terminal plate 27 and the high voltage electrode 9. Furthermore, 30 is a resistance temperature detector for detecting a temperature rise during a liquid load test;
1 is a drain valve for draining liquid.

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

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. 8 is a plan view of the sub-tank 4 alone. FIG. 3 is a view taken along arrow C;

In the figure, the tanks 4a, 4b, 4c are each constructed separately so that the three high-voltage electrodes 9 can be constructed independently for each phase, and 33 is provided with the above-mentioned insulating material at the upper end of each tank 4a, 4b, 4c. 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 an 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
Individual valves 6 provided in the three branch pipes 5a that are connected to the nozzle 5 and that allow inflow from the nozzle 5
Then, the flow rate of the liquid injected from the nozzle 5 and the branch pipe 5a is individually adjusted and balanced for each tank 4a, 4b, and 4c. 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 the tanks 4a, 4b for each phase,
4c Each tank 4a, 4 without overflowing each other
It is discharged into the liquid tank 1 from the notches 4d of b and 4c.
Also, if this discharged liquid exceeds a certain amount,
It is discharged from the discharge pipes 22 and 23 and collected or discarded. In this way, the liquid is forcibly regulated and distributed in each tank, cooling the area around the high-voltage electrode 9 and preventing the temperature of the liquid from rising. Here, each branch pipe 5a has an opening at its tip and is provided with an individual valve 6 at its base end, so that the flow of liquid to each phase is balanced. In other words, if the tip has an opening, even if there is a single opening,
In addition, even if there are multiple valves, there is no change in head pressure at the tip, so by adjusting the individual valves 6,
Improves liquid distribution balance.

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 fluid flow rate is detected by a flow meter 24, and the high voltage electrode 9 is raised and lowered. Along with this, the specific resistance value of the liquid changes due to the rise in temperature, so the fluid 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 its respective insulating cylinder so that it can slide back and forth, and a sub-tank is provided for each high-voltage electrode in the liquid tank, so that the liquid is forced to flow into these sub-tanks. The electric field in the radial direction of the high-voltage electrode can be suppressed to a low value, and not only can a predetermined load be stably obtained, but also the liquid tank can be made compact. In addition, the nozzle installed in each sub-tank can concentrate the movement of the liquid in the area that is in contact with the surface of the protruding part from the insulating tube of the high-voltage electrode, and the liquid flow rate can be controlled individually for each sub-tank using individual valves. Therefore, it is possible to efficiently suppress the rise in the ambient temperature of each high voltage electrode while maintaining the balance of each phase.

[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 line VI-VI in Figure 5;
7 is a bottom view of FIG. 5, FIG. 8 is a view taken from arrow C in FIG. Figure 11 is an overall front view showing a conventional load test device.
FIG. 2 is an enlarged sectional view taken along line IX-IX in FIG. 1...Liquid tank, 4...Sub tank, 4a, 4b,
4c...tank, 4d...upper notch, 4e...
Lower notch, 5...nozzle, 6...individual valve,
7... Distribution device, 7a... Valve, 8... Insulating tube, 9... High voltage electrode, 35... Insulating pulp, 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 tube, a plurality of high-voltage electrodes that are slidably inserted into each of these insulating tubes and inserted into and taken out from the liquid from an end of each of the insulating tubes, and a discharge end facing each of the high-voltage electrodes. It has a nozzle that is branched for each sub-tank and injects the liquid to the tip of each high-voltage electrode, and an individual valve installed in each branch pipe of this nozzle, so that the liquid can be injected into each of the sub-tanks. A liquid resistor device comprising: a flow device for forced flow.