CN2368039Y

CN2368039Y - Phase-sequence identifying apparatus

Info

Publication number: CN2368039Y
Application number: CN 99201941
Authority: CN
Inventors: 侯建民
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-01-02
Filing date: 1999-01-02
Publication date: 2000-03-08
Anticipated expiration: 2009-01-02

Abstract

The utility model relates to a novel phase sequence discriminating device for discriminating the three-phase alternating current phase sequence, which comprises a casing, a signal detection polar plate, an amplifying shaping circuit, a reference pulse generating circuit which is formed by a monostable circuit, a phase sequence discriminating circuit which is formed by an and gate, a drive circuit, a display device, a power supply. The device is that the pole plate picks up an alternating induction signal, the contrast signal is offered by the reference pulse generating circuit, and the phase sequence discriminating function is realized by the phase sequence discriminating circuit and is visually displayed by the display device. The utility model has the advantages of quick and accurate discrimination and convenient operation and use.

Description

Novel phase sequence cognition device

The utility model is a kind of pick-up unit that phase order of 3-phase AC is used of differentiating, and relates to electric measurement.

Before the utility model, the instrument that is commonly used to differentiate phase order of 3-phase AC is a phase-sequence meter, and its inside is a small-sized triphase motor.During use its three lead-in wires are received respectively and wait to distinguish on the three-phase supply of phase sequence, judge that according to the sense of rotation of motor the phase sequence of three-phase supply, the method weak point are, discriminating gear needs to carry out with power supply to be discriminated and be electrically connected, and uses inconvenience.

The goal of the invention of the utility model provides a kind of induction type three-phase electricity phase sequence cognition device, need not be electrically connected to make things convenient for and distinguish phase sequence rapidly.

According to the utility model, adopt two to detect pole plate (1), (2) detection alternation induced signal, two pole plates connect the input end of amplification and rectification circuit (3), (4) respectively; The output terminal of amplification and rectification circuit (3) connects the input end of monostable circuit (5), is made of with reference to pulse-generating circuit (15) monostable circuit (5), (6); The input of AND circuit (7), (8) is done in its output respectively, and another input of AND circuit (7), (8) is done in the output of amplification and rectification circuit (4), constitutes phase sequence cognition circuit (16) by AND circuit (7), (8); Differentiate the output pulse through driving circuit (9) or (11), display device (10) or (12) are shown.The utility model adopts the detection pole plate to pick up the lead faint alternating signal of induced field on every side, finishes phase sequence cognition jointly by reference pulse-generating circuit and sequence judging circuit, is shown at last, needn't be electrically connected accurately judgement rapidly.

Below, the utility model is described in further detail in conjunction with the accompanying drawings.

Fig. 1, the utility model circuit block diagram

Fig. 2, the utility model oscillogram

Fig. 3, the utility model embodiment electrical schematic diagram

In the accompanying drawing 1, each basic circuit, device mark: housing (14), pole plate (1), (2), amplification and rectification circuit (3), (4), monostable circuit (5), (6), the RC delay circuit, with door (7), (8), driving circuit (9), (11), display device (10), (12), power supply (13), each basic circuit, device connect by shown in the figure.

Shown in Fig. 2 a, three-phase alternating current, each phase phase differential is 120 °, by oscillogram 2b, c, shown in the d, the three-phase electricity sine wave shaped is square wave (negative half period of pruning), adjacent two-phase has the coincidence period of T/6, promptly leading to each other or backward 120 ° of phase places if begin with reference phase starting point t0, produce two with reference to pulse square wave X1 and X2, and make width be respectively T/4, compare with unknown square wave mutually undetermined respectively with reference to square wave with these two, that is by with door (7) or (8), if display (10) shows, represent that then the unknown is mutually in advance with reference to phase T/3, if display (12) shows that expression the unknown falls behind mutually with reference to phase T/3, a unknown is determined mutually, another is unknown also just definite mutually, and phase sequence is promptly determined.Its technical scheme is, as shown in Figure 1, adopt 2 pickoff signals with detecting pole plates (1), (2), and regulation pole plate (1) is with reference to the phase pole plate, it close one is decided to be mutually with reference to phase, pole plate (2) is unknown phase pole plate, it close one treats phasing for the unknown, and pole plate (1) is connected with the input end of amplification and rectification circuit (3), the output of amplification and rectification circuit (3), get its square wave front edge and trigger monostable circuit (5), and the time constant of setting monostable (5) is τ ₁, and τ ₁=T/4, the width that is monostable (5) output square wave X1 is T/4, this square wave is added to an input end with door (7), gets the back along triggering monostable circuit (6) (can allow and trigger monostable (6) along or differential anti-phase by one-level thereafter) of X1 square wave simultaneously, and the setting-up time constant is τ ₂, and τ ₂=τ ₁, i.e. X2=X1 makes the X2 square wave be added to a input end with door (8), and above-mentioned monostable (5), (6) output square-wave waveform are seen e, the f of accompanying drawing 2.The output square wave of amplification and rectification circuit (4) again is added to another input end with door (7) and (8) simultaneously, as if the unknown mutually in advance with reference to phase, open with door (7), square wave output is arranged, see the q of accompanying drawing 2, through driving circuit (9) (10) are shown, and be not opened with door (8), there is not demonstration, if the unknown falls behind mutually with reference to phase, opened square wave output with door (8), see the h of accompanying drawing 2, and (7) are the state of closing the door, do not have demonstration.Above-mentioned, monostable circuit (5), (6) constitute with reference to pulse-generating circuit, constitute the phase sequence cognition circuit with door (7), (8).Each basic circuit can adopt discrete component, also can adopt integrated circuit, wiring board and power supply (13) are loaded in the housing (14), two detect pole plates is made generally in tabularly, also can be bar-shapedly, and they can be lived with housing and be connected, or it is fixedly connected, the two distance should be avoided signal interference each other, during use, makes the two-phase of close three-phase electricity respectively of two pole plates.

In the accompanying drawing 1, between monostable (5) and (6), insert a RC delay circuit, and time-delay T/6, so, make output square wave interval T/6 of monostable (5), (6), the anti-interference mistake demonstration effect of avoiding is arranged, be preferred embodiment of the utility model.

The utility model can employing sound, light, digital symbol show that the utility model embodiment adopts two look diodes, and the unknown shows red (promptly (10) show) mutually in advance, and the unknown falls behind mutually and shows blue look (i.e. (12) demonstration).

When the simultaneously close phase time of two pole plates, display device (10), (12) show simultaneously, are yellow, and this can make another function that electroscope uses for the utility model.

Embodiment, electrical schematic diagram as shown in Figure 3, (1), (2) be two and detect pole plate, (3), (4) be amplification and rectification circuit, detected faint sine wave signal is amplified amplitude limit be shaped to square wave, monostable circuit (5), (6) adopt integrated circuit, model C C4538, each pin connects as figure, the A input end of the output order steady-state circuit (5) of amplification and rectification circuit (3), (5) Q end output connects the A input end of (6), perhaps be connected in series the RC delay circuit betwixt, (5) Q end output is as an input end of Sheffer stroke gate (7), (6) Q end output is as an input end of Sheffer stroke gate (8), the output of amplification and rectification circuit (4) is as Sheffer stroke gate (7), (8) another input end, Sheffer stroke gate (7), (8) output connects driving circuit (9) respectively, (11) B input end, (9), (11) still adopt integrated circuit CC4538, be pin A ground connection, B is an input end, CLR meets power supply VCC, has pulse strenching effect (that is driving circuit), (9), (11) Q output terminal connects light emitting diode RED (10) and (12) respectively.

Claims

1, a kind ofly differentiates the novel phase sequence cognition device that phase order of 3-phase AC is used, comprise housing, detect pole plate, amplification and rectification circuit, monostable circuit, gate circuit, driving circuit, display device and all parts of power supply, it is characterized in that input pole plate (1), (2) connect the input end of amplification and rectification circuit (3), (4) respectively; By monostable circuit (5) export that monostable circuit (6) constitutes to reference to pulse-generating circuit (15), the output terminal of the input termination amplification and rectification circuit (3) of monostable circuit (5) wherein; Phase sequence cognition circuit (16) by AND circuit (7), (8) formation, wherein one of AND circuit (7) input termination amplification and rectification circuit (4) output terminal, the output terminal of another input end order steady-state circuit (5), the output terminal of an input termination amplification and rectification circuit (4) of AND circuit (8), the output terminal of another input end order steady-state circuit (6); The output of AND circuit (7) connects driving circuit (9) successively to display device (10), and the output of AND circuit (8) connects driving circuit (11) successively to display device (12).

2, according to the described novel phase sequence cognition device of claim 1, it is characterized in that the output of monostable circuit (5) connects the RC delay circuit, the output order of delay circuit is the input end of whole circuit (6) surely.