JPS636697Y2 - - Google Patents

Description

[Detailed description of the invention] This invention measures the insulation resistance and withstand voltage test of the main circuit and control circuit of the switchboard by electrically controlling the opening and closing of each switching switch and each earthing switch. , relates to an insulation/voltage testing device for switchboards designed to reduce work man-hours and improve safety.

Conventionally, a switchboard insulation/withstand voltage testing device that measures the insulation resistance and withstand voltage test of the main circuit and control circuit of a switchboard has a main circuit insulation resistance meter 1, a control circuit insulation resistance tester, and a control circuit insulation resistance tester, as shown in Fig. 1. Using the measuring instrument 2, main circuit voltage transformer 3, and control circuit voltage transformer 4, insulation resistance measurement and voltage strength test were performed on the sample switchboard 5 according to the procedure shown in Figure 2. For each of the test items in (1) to (3), an operator manually changes connections near the switchboard 5. That is, b, c,, d, g, h,, i, j,, in the same figure
Works k, n, o, and p are performed near the switchboard 5, and other work is performed using the insulation resistance measuring instruments 1,
2 or near each of the voltage transformers 3 and 4. In addition, in FIG. 1, 6 is a wire cutter, 7 is a current transformer, 8 is a main circuit conductor, and 9 is a control terminal block.

However, according to the conventional test equipment, the insulation resistance measuring instruments 1,
2 and voltage transformers 3 and 4 are all independent, in addition to the main test work shown in Figure 2, additional work a to q that requires the operator to move many times is required. The number of man-hours increases, and since all of these tasks are done manually by the operator, the tasks become complicated and take a lot of time, and there are disadvantages in that the test cannot be automated. In addition, since each insulation resistance measuring device 1, 2 and each voltage transformer 3, 4 are arranged as shown in Fig. 1 for each test, the area required for the test increases and It is difficult to keep things tidy, and since the work involves handling high voltage, there are problems with very high safety concerns.

Taking the above points into consideration, this invention includes an insulation resistance measuring device and a voltage transformer for the main circuit and control circuit of the switchboard inside the box, and a switching switch and a grounding switch for the main circuit and control circuit. The opening and closing of the two are controlled by electrical means, and the insulation resistance and withstand voltage tests are performed on each of them.
This will be explained in detail with reference to the drawings below.

First, FIGS. 3 to 8 showing one embodiment will be explained.

In these drawings, the same symbols as above indicate the same things, 10 is a box for insulation/voltage testing equipment such as a metal shield box with an open front, and 11 and 12 are the inside bottom of the box 10. A main circuit voltage transformer and a control circuit voltage transformer installed inside, 13 and 14 a main circuit insulation resistance measuring device and a control circuit insulation resistance measuring device installed inside the box body 10, and 15 a rear wall inside the box body 10. This is a switching disconnector for the main circuit that is supported on the upper part and switches between insulation resistance measurement and withstanding voltage test of the main circuit, and one fixed contact 15a has a main circuit withstand voltage transformer 11, and the other fixed contact 15b has a main circuit insulation resistance test. The measuring instruments 13 are connected to each other, and the movable contact 15c is connected to the main circuit terminal 16 on the back surface of the box 10, and the main circuit terminal 16 is connected to the main circuit conductor 8 of the switchboard 5. 17
18 is a main circuit grounding/disconnecting switch supported below the switching/disconnecting switch 15 and grounding the main circuit, and a fixed contact 18a penetrates the rear wall of the box 10. The movable contact 18b is connected to the main circuit terminal 16, and the movable contact 18b is grounded. 19 is an operating device for the grounding/disconnecting switch 18; 20 is a switching electromagnetic contactor for the control circuit that switches between insulation resistance measurement and withstanding voltage test of the control circuit; 21 is a grounding electromagnetic contactor for the control circuit that grounds the control circuit; The control terminal block 9 of the switchboard 5 is connected to the control circuit terminal 22 on the back of the box 10, and both electromagnetic contactors 2
0 and 21 are each connected to the control circuit terminal 22. 23 is an electrically operated voltage regulator;
A power source is connected to the secondary side, and both voltage-resistant transformers 11 and 12 are connected to the secondary side, respectively. Reference numeral 24 denotes a sequence circuit that is provided at the upper front of the box body 10 and controls the main circuit and control circuit operating devices 15, 18 and the electromagnetic contactors 20, 21. Strict control is performed.

25 is a door that can be opened and closed in the front of the box 10, and a main circuit meter 26 (KV, mA, MΩ)
is installed. Reference numeral 28 is provided in the center of the door 25 to operate a graphic panel, etc., for operating the voltage transformers 11 and 12, the insulation resistance measuring devices 13 and 14, the disconnectors 15 and 18, and the electromagnetic contactors 20 and 21. It is a panel.

Next, the operation of the embodiment will be explained using FIG. 8.

First, the control circuit and the main circuit are each short-circuited, and the control circuit and the main circuit are connected as shown in FIG. 3, respectively. Next, the power is turned on and the d selection operation for measuring the main circuit insulation resistance is performed. That is, the control circuit is grounded by the grounding electromagnetic contactor 21 for the control circuit, and the switching disconnector 15 for the main circuit is grounded.
The movable contact 15c is brought into contact with the other fixed contact 15b, and the insulation resistance measuring device 13 is connected to the main circuit.
Then, an insulation resistance measurement is performed, and the measured value is displayed on the meter 26 (MΩ). Next, perform the e selection operation for the main circuit withstand voltage test, and then
5 to connect the main circuit voltage transformer 11 to the main circuit, and turn on the power to the voltage transformer 11. Then, a withstand voltage test is carried out, and the measured value is read with a meter 26 (KV, mA). After this withstand voltage test, in the f selection operation, the power supply of the withstand voltage transformer 11 is opened, and the earthing disconnector 18 is closed. The main circuit is grounded, the switching disconnector 15 is switched, and the insulation resistance measuring device 13 is connected to the main circuit again.
Open the earthing/disconnecting switch 18 and measure the insulation resistance again.

Next, a g selection operation is performed to measure the insulation resistance of the control circuit, the main circuit is grounded by the earthing disconnector 18, the grounding of the control circuit is disconnected by the grounding magnetic contactor 21, and the switching magnetic contactor is Control circuit insulation resistance measuring instrument 1 to the control circuit by 20
Connect 4. Then, the insulation resistance of the control circuit is measured, and the measured value is read with a meter 27 (MΩ). After this measurement, in the h selection operation, the switching magnetic contactor 20 is operated to connect the control circuit voltage transformer 12 to the control circuit. Then, the voltage transformer 12 is powered on. Then, we conducted a withstand voltage test on the control circuit.
This measured value is displayed on the meter 27 (KV, mA). Next, in the i selection operation, the power of the voltage transformer 12 is opened, the control circuit is grounded by the grounding magnetic contactor 21, and the switching magnetic contactor 20 is operated to connect the insulation resistance measuring device 14 to the control circuit.
, then disconnect the control circuit from ground and measure the insulation resistance of the control circuit again. After completing this measurement, disconnect the power and remove all connections.
In addition, in FIG. 8, only operations a, b, and k are performed near the switchboard 5.

Therefore, according to the embodiment described above, once the operations a and b shown in FIG. The sequence circuit 24 is driven by the voltage transformers 11, 12,
By controlling the power supply of each insulation resistance measuring device 13 and 14 and controlling the opening and closing of each disconnector 15 and 18 and each electromagnetic contactor 20 and 21, these test operations can be performed and the number of work steps can be reduced. Since various devices are housed in the box 1 and electrically controlled, there is little work to be done near the switchboard 5, and safety can be improved. In addition, the test equipment can not only automatically set the applied voltage, but also electrically control a series of test procedures such as test item selection, circuit switching, and voltage rise/fall, so automatic interlocking is possible. If the sequence circuit 24 is made into an interlocking sequence, the selection operations of e, f, g, h, and i in FIG. 8 can be omitted.

Furthermore, the measured values of the insulation resistance measurement and withstand voltage test of the main circuit and control circuit are
Not only can direct reading be performed using the meters 26 and 27, but also these measured values can be taken out as electrical signals, and here, these measured values can be sent to an external automatic data creation device such as a computer or typewriter. This will enable automatic data creation.

In the above embodiment, the disconnector 18 was used as the earthing switch of the main circuit, but an electromagnetic single-pole VS may be used.

Next, the drawings from FIG. 9 onwards showing other embodiments will be explained.

These drawings show the case where the test device box 10 is installed on a production inspection line, and 29 is a three-row roller conveyor, which is used to transport the switchboard 5 of the test device,
Transport takes place. Reference numeral 30 denotes wire meshes having a U-shape and an L-shape on both sides of the roller conveyor 29. Both wire meshes 30 and the box body 10 cover both sides of the roller conveyor 29, and during the test, the wire meshes 30 and the box body 10 cover the roller conveyor 29. Safety rope 3 on the front and back sides of the switchboard 5
1 is suspended, and entry to the vicinity of the switchboard 5 is prohibited.

Therefore, according to the embodiment, the switchboards 5 brought in by the roller conveyor 29 can be inspected one after another at the location, and as described above, the workability of the test work is good, and the box body 10 Since only the operation panel 28 on the front side of the machine is required, inspections can be carried out smoothly.

In addition, in a mass production factory, if the wiring work a, b, and k in Fig. 8 and the above-mentioned loading and unloading of the switchboards 5 are automated, a large number of switchboards 5 can be inspected efficiently without any need for automatic inspection. It is possible to establish an inspection system.

In addition, the operation panel 28 provided on the door 25 of the box body 10, various instruments 26, 27, and the sequence circuit 24 inside the box body 10, etc., are separated from the box body 10 and set as a separate monitoring control panel. It may be installed at a certain position.

As described above, according to the insulation/withstand voltage test device for a switchboard of this invention, the insulation resistance measuring instruments and voltage transformers of the main circuit and control circuit installed inside the box for the insulation/withstand voltage test device, and the voltage transformer of the switchboard are installed. By connecting the main circuit and the control circuit with each switching switch, and grounding the main circuit and the control circuit through each grounding switch, and controlling the opening and closing of each of these switches by electrical means,
The series of test progress of insulation resistance measurement and withstanding voltage test, that is, selection of test items, switching of circuits, raising and lowering of voltage, etc., can be performed in an automatic interlocking manner by electrical control, and it is possible to approach the switchboard of the specimen under test. You can do the work without any problems, reduce the number of work hours, and
Insulation measuring instruments and voltage transformers are housed inside the box, reducing the area required for testing.
Safety can be improved because there is no need to approach the switchboard during testing or work.

[Brief explanation of the drawing]

Figures 1 and 2 show the conventional insulation/withstand voltage test equipment for a switchboard. Figure 1 is a schematic side view, Figure 2 is a flowchart, and Figure 3 and the following drawings are insulation/withstand voltage test equipment for a switchboard of this invention. An example of a test device is shown,
Figures 3 to 8 show one embodiment, Figure 3 is a schematic side view, Figure 4 is a front view of the box, Figure 5 is a front view of the inside of the box, and Figure 6 is the box. Cutaway side view of
Fig. 7 is a rear view of the box, Fig. 8 is a flowchart, Fig. 9 and the following drawings show other embodiments.
Figures 1 and 10 are a front view and a plan view of the box installed on a production inspection line. 5...Switchboard, 10...Box, 11...Main circuit voltage transformer, 12...Control circuit voltage transformer,
13...Main circuit insulation resistance measuring instrument, 14...Control circuit insulation resistance measuring instrument, 15...Main circuit switching disconnector, 18...Main circuit earthing disconnector, 20...Control circuit switching electromagnetic contactor , 21...Grounding electromagnetic contactor for control circuit, 24...Sequence circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] Insulation resistance measuring instruments and voltage transformers for the main circuit and control circuit of a switchboard are installed in a box for insulation/voltage testing equipment, and the insulation resistance of the main circuit and control circuit is measured. insulation of a switchboard, which is provided with switching switches for switching between and withstanding voltage test, and grounding switches for grounding the main circuit and control circuit, and electrical means for controlling opening and closing of each of the switches;・Pressure test equipment. The insulation/withstanding voltage testing device for a power distribution board according to claim 1, wherein the measured values of the insulation resistance measurement and withstanding voltage test of the main circuit and the control circuit are derived to an external automatic data creation device.