CN205003219U

CN205003219U - Quick testing arrangement of three -phase low pressure ac circuit

Info

Publication number: CN205003219U
Application number: CN201520781510.7U
Authority: CN
Inventors: 林家光
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-10-10
Filing date: 2015-10-10
Publication date: 2016-01-27
Anticipated expiration: 2025-10-10

Abstract

The utility model discloses a quick testing arrangement of three -phase low pressure ac circuit. Quick testing arrangement of three -phase low pressure ac circuit, including A phase terminal, B phase terminal, C phase terminal, first resistance (R1), second resistance (R2), third resistance (R3), electric capacity (C1) and neon tube (1), the first end of neon tube (1) is connected to A phase terminal, C phase terminal through first resistance (R1), third resistance (R3) respectively, and the second end of neon tube (1) is connected to B phase terminal, C phase terminal through second resistance (R2), electric capacity (C1) respectively. When A phase terminal, B phase terminal, when the C phase terminal is connected to the exact phase line respectively, the neon tube shines, and the phase line of connecting when A phase terminal, B phase terminal, C phase terminal has mistakes, and the neon tube does not work. Thus, the utility model discloses a whether the neon tube shines can be measured the phase sequence of each phase line of three -phase electricity fast, and simple structure, with low costs.

Description

Three-phase low-voltage alternating circuit device for quick testing

Technical field

The technical field that the utility model belongs to, is specifically related to a kind of three-phase low-voltage alternating circuit device for quick testing.

Background technology

At present, three-phase alternating current system is used widely in every field, in use, often causes three-phase phase-sequence wrong phenomenon to occur due to personnel's carelessness, cause many electric faults such as the user power utilization equipment that burns out, the reversing of user's motor, sometimes also can have an accident.Therefore, the phase sequence test of three-phase alternating current is very important, is engaged in the personnel of low-voltage power work, operationally needs to judge whether power phase meets the requirements.

In the detection of three-phase electricity, A, B, C three-phase of three-phase electricity be judged, normally utilize oscillograph to measure its waveform and sequential, and therefrom contrast judges that whether A, B, C three-phase phase-sequence is correct.But because oscillograph volume is large, inconvenience is carried with, and affect detection efficiency, in addition, costly oscillographic, it is higher that use oscillograph carries out Phase sequence detection cost.Also it is many to there is device in other known three-phase phase sequence metering circuits, circuit is comparatively complicated, the shortcomings such as cost is higher.

Above-mentioned discussion content object be to reader introduce may to below by the various aspects of technology relevant for the various aspects of the present utility model be described and/or advocate, believe that this discussion content contributes to for reader with background's information, to be conducive to understanding various aspects of the present utility model better, therefore, should be appreciated that it is discuss to read these with this angle, instead of admit prior art.

Utility model content

The purpose of this utility model is avoid deficiency of the prior art and provide a kind of three-phase low-voltage alternating circuit device for quick testing, and it can be measured the phase sequence of three-phase electricity fast, and structure is simple, cost is low.

The purpose of this utility model is achieved through the following technical solutions:

A kind of three-phase low-voltage alternating circuit device for quick testing is provided, comprise A phase terminal, B phase terminal, C phase terminal, first resistance R1, the second resistance R2, the 3rd resistance R3, electric capacity C1 and neon bulb, the first end of described neon bulb is connected to A phase terminal, C phase terminal through the first resistance R1, the 3rd resistance R3 respectively, and the second end of neon bulb is connected to B phase terminal, C phase terminal through the second resistance R2, electric capacity C1 respectively.

Wherein, the resistance of described first resistance R1 is 330K.

Wherein, the resistance of described second resistance R2 is 560K.

Wherein, the resistance of described 3rd resistance R3 is 330K.

Owing to have employed above-mentioned structure, when A phase terminal, B phase terminal, C phase terminal are connected to correct phase line respectively, neon bulb is shinny, and when the phase line that A phase terminal, B phase terminal, C phase terminal connect is wrong, neon bulb does not work.Like this, the utility model can be measured the phase sequence of three-phase electricity each phase line rapidly by whether neon bulb is shinny, and structure is simple, cost is low.

Accompanying drawing explanation

The utility model is described in further detail to utilize accompanying drawing, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the following drawings.

Fig. 1 be three-phase low-voltage alternating circuit device for quick testing phase sequence connect correct time circuit diagram.

Fig. 2 is sequential vector figure.

Circuit diagram when Fig. 3 is three-phase low-voltage alternating circuit device for quick testing phase sequence connection error.

Fig. 4 is counter ordinal vector figure.

Embodiment

The technical solution of the utility model is understood better in order to make those skilled in the art, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, it should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.

Core of the present utility model is to provide a kind of three-phase low-voltage alternating circuit device for quick testing, and it can be measured the phase sequence of three-phase electricity fast, and structure is simple, cost is low.

As shown in Figures 1 to 4, three-phase low-voltage alternating circuit device for quick testing described in the utility model, comprises A phase terminal, B phase terminal, C phase terminal, the first resistance R1, the second resistance R2, the 3rd resistance R3, electric capacity C1 and neon bulb 1.Described A phase terminal, B phase terminal, C phase terminal are for connecting each phase line of three-phase electricity, and the resistance of described first resistance R1 is 330K, and the resistance of described second resistance R2 is 560K, and the resistance of described 3rd resistance R3 is 330K.The first end of described neon bulb 1 is connected to A phase terminal, C phase terminal through the first resistance R1, the 3rd resistance R3 respectively, and the second end of neon bulb 1 is connected to B phase terminal, C phase terminal through the second resistance R2, electric capacity C1 respectively.

Principle of work of the present utility model:

Because the internal resistance of neon bulb 1 is larger, can think that the two ends of neon bulb 1 are for open circuit, then the current potential of second end (O point) of neon bulb 1 is determined by the second resistance R2, the electric capacity C1 that connect between B phase terminal, C phase terminal, and the current potential of the first end of neon bulb 1 (O ' point) is then determined by the first resistance R1 connected between A phase terminal, C phase terminal, the 3rd resistance R3.When A phase terminal, B phase terminal, C phase terminal correctly access the corresponding phase line of three-phase electricity, now sequential vector figure as shown in Figure 2, and the first resistance R1, the 3rd resistance R3 are connected in AC phase, and are ohmic, therefore the track that O ' puts is at vectorial U _cAon, and the second resistance R2, electric capacity C1 are connected in BC phase, and be capacitive, so the track of O point is on the semi arch BC taking BC as diameter, such neon bulb O point and O ' point occur being added in certain voltage on neon bulb and making it shinny.When A phase terminal, B phase terminal, C phase terminal access the corresponding phase line of three-phase electricity mistakenly, as shown in Figure 3, the phase line that B phase terminal, C phase terminal connect is wrong, and now counter ordinal vector figure as shown in Figure 4, and the track that O ' puts is at vectorial U for wiring diagram _aBon, the second resistance R2 is connected in CB phase with electric capacity C1, and is capacitive, so with the track of O point on the semi arch CB taking CB as diameter, at this moment semi arch is upwards, then O point and O ' point overlap, and neon bulb does not work.

Set forth a lot of detail in description above so that fully understand the utility model, but the utility model can also adopt other to be different from other modes described here and implement, and therefore, can not be interpreted as the restriction to the utility model protection domain.

In a word; although the utility model illustrates above-mentioned preferred implementation; but should illustrate; although those skilled in the art can carry out various change and remodeling; unless such change and remodeling deviate from scope of the present utility model, otherwise all should be included in protection domain of the present utility model.

Claims

1. a three-phase low-voltage alternating circuit device for quick testing, it is characterized in that: comprise A phase terminal, B phase terminal, C phase terminal, first resistance (R1), the second resistance (R2), the 3rd resistance (R3), electric capacity (C1) and neon bulb (1), the first end of described neon bulb (1) is connected to A phase terminal, C phase terminal through the first resistance (R1), the 3rd resistance (R3) respectively, and the second end of neon bulb (1) is connected to B phase terminal, C phase terminal through the second resistance (R2), electric capacity (C1) respectively.

2. three-phase low-voltage alternating circuit device for quick testing according to claim 1, is characterized in that: the resistance of described first resistance (R1) is 330K.

3. three-phase low-voltage alternating circuit device for quick testing according to claim 1, is characterized in that: the resistance of described second resistance (R2) is 560K.

4. the three-phase low-voltage alternating circuit device for quick testing according to claim 1 or 2 or 3, is characterized in that: the resistance of described 3rd resistance (R3) is 330K.