CN203217856U - Teaching aid for demonstrating shield principle of insulation resistor test - Google Patents

Abstract

The utility model discloses a teaching aid for demonstrating shield principle of insulation resistor test. The teaching aid comprises a stainless steel support and a transparent acrylic panel. The transparent acrylic panel is fixed on the stainless steel support; and the transparent acrylic panel is provided with a first digital display ammeter, a power supply and a second button switch, which are in series connection, and two paths of resistor model circuits in parallel connection. As the shield principle of the insulation resistor test is the difficulty and key point in practical training teaching and is abstract and complex, the demonstration teaching by the teaching aid disclosed by the utility model can embody the theory visually to clearly enlighten and express the students, thereby effectively realizing integration of ''teaching and practice'' and substantially raising effect of practical training. Currently, the teaching aid is an initiation in the field of practical training teaching of electrical test, and has outstanding advantages; and no similar product is on the market.

Description

A Teaching Aid for Demonstrating the Shielding Principle of Insulation Resistance Test

technical field

The utility model relates to a teaching aid for demonstrating the shielding principle of an insulation resistance test.

Background technique

The device is a teaching aid for demonstrating the shielding principle of insulation resistance test. When testing the insulation resistance of electrical equipment in the power system, the environment often has high humidity and the surface of the tested product is dirty. Under such conditions, it is necessary to shield the surface of the tested product’s porcelain sleeve to eliminate the possibility of surface leakage current. Influenced, the real insulation resistance value of the test object is obtained. Based on this, in the process of electrical test professional training, insulation resistance test shielding measures and principle analysis are the focus and difficulty of this key skill item, but there are no such teaching supplies at present.

Utility model content

In order to solve this difficult point in practical training and teaching, the utility model has developed the teaching aid for demonstrating the shielding principle of insulation resistance test in combination with the actual shielding wiring method and the testing principle of digital megohmmeter. It has the advantage of simple structure.

In order to achieve the above object, the utility model adopts the following technical solutions.

A teaching aid for demonstrating the shielding principle of an insulation resistance test, including a stainless steel bracket and a transparent acrylic panel; the transparent acrylic panel is fixed on the stainless steel bracket, and the transparent acrylic panel is provided with a volume insulation resistance model, a first surface insulation resistance model, and a second surface insulation Resistance model, third surface insulation resistance model, first digital display ammeter, second digital display ammeter, third digital display ammeter, first button switch, second button switch, power supply; first digital display ammeter, power supply, second The button switch is connected in series with two parallel resistance model circuits, one resistance model circuit includes a series volume insulation resistance model and a second digital display ammeter, and the other resistance model circuit is the third surface insulation resistance model and the second surface insulation resistance model connected in series in sequence. Resistance model, the first surface insulation resistance model, and the third digital display ammeter; one end of the first button switch is connected between the power supply and the first digital display ammeter, and the other end is connected to the second surface insulation resistance model, the first surface insulation resistance between models.

Beneficial effects of the utility model: Since the shielding principle in the insulation resistance test is the difficulty and focus of practical training and teaching, it is relatively abstract and complicated. Through the demonstration teaching of this teaching aid, this theory can be embodied intuitively and visually, allowing students to understand shielding The principle is clear at a glance and impressive, effectively realizing the integration of "teaching and doing". Significantly improve the training effect and teaching level. At present, this teaching aid is the first in the field of electrical experiment training teaching, with outstanding advantages, and there is no similar product.

Description of drawings

Figure 1 is a structural diagram of the visual teaching aid for the principle of insulation resistance shielding test.

Among them, A1, A2, A3 are the first digital display ammeter, the second digital display ammeter, and the third digital display ammeter; K1, K2 are the first button switch and the second button switch respectively; R is the volume insulation resistance model; R1 , R2, R3 are the first surface insulation resistance model, the second surface insulation resistance model, and the third surface insulation resistance model; 1 is the stainless steel bracket; 2 is the transparent acrylic panel; 3 is the power supply.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figure 1, a teaching tool for demonstrating the shielding principle of insulation resistance test, including a stainless steel bracket 1, a transparent acrylic panel 2; the transparent acrylic panel 2 is fixed on the stainless steel bracket 1, and the volume insulation resistance model R , the first surface insulation resistance model R1, the second surface insulation resistance model R2, the third surface insulation resistance model R3, the first digital display ammeter A1, the second digital display ammeter A2, the third digital display ammeter A3, the first button switch K1, second button switch K2, power supply 3; first digital display ammeter A1, power supply 3, second button switch K2 are connected in series with two parallel resistance model circuits, and one resistance model circuit includes series volume insulation resistance model R and the second resistance model circuit Two digital display ammeters A2, another resistance model circuit is the third surface insulation resistance model R3, the second surface insulation resistance model R2, the first surface insulation resistance model R1, and the third digital display ammeter A3 connected in series; One end of the button switch K1 is connected between the power supply 3 and the first digital display ammeter A1, and the other end is connected between the second SIR model R2 and the first SIR model R1.

L, G, and E respectively correspond to the three terminals of the digital megohmmeter. By closing the second button switch K2 and opening the first button switch K1, the volume insulation resistance model R and the first surface insulation resistance model R1, the second Both the surface insulation resistance model R2 and the third surface insulation resistance model R3 are illuminated; the first digital display ammeter A1, the second digital display ammeter A2, and the third digital display ammeter A3 all display the current value, and the first digital display ammeter A1 reading It is the sum of the currents of the second digital display ammeter A2 and the third digital display ammeter A3; it shows that when no shielding measures are added, the tested insulation resistance is the parallel equivalent value of the volume insulation resistance and the surface insulation resistance; then close the first button switch K1, that is When corresponding to the actual wiring of the shield, connect the upper shield ring of the tested product to the G terminal of the megohmmeter. At this time, the first surface insulation resistance model R1 light is off, and the third digit shows that the current indicator of the ammeter A3 is zero, and the first digit The readings of the display ammeter A1 and the second digital display ammeter A2 are equal, which just shows that in this case, the megohmmeter tests the volume insulation resistance, that is, the real insulation resistance value of the tested product, and demonstrates the shielding principle in detail.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (1)

1. a teaching aid of demonstrating the insulation resistance test shielding principle is characterized in that, comprises stainless steel stent, transparent acrylic panel; Transparent acrylic panel is fixed on the stainless steel stent, and transparent acrylic panel is provided with volume insulation resistance model, first surface insulation resistance model, second surface insulation resistance model, the 3rd surface insulation resistance model, the first numeral demonstration reometer, the second numeral demonstration reometer, the 3rd digital reometer, first pushbutton switch, second pushbutton switch, the power supply of showing; The first numeral demonstration reometer, power supply, second pushbutton switch are connected with two-way Resistance model for prediction circuit in parallel, one tunnel Resistance model for prediction circuit comprises that the volume insulation resistance model of series connection and second numeral show reometer, and another road Resistance model for prediction circuit is that the 3rd surface insulation resistance model, second surface insulation resistance model, first surface insulation resistance model, the 3rd numeral of series connection successively shows reometer; Described first pushbutton switch, one end publishes in instalments power supply and first numeral shows that the other end is connected between second surface insulation resistance model, the first surface insulation resistance model between the reometer.

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