CN2328017Y

CN2328017Y - Phase sequence meter

Info

Publication number: CN2328017Y
Application number: CN 98223928
Authority: CN
Inventors: 谢为驹
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-06
Filing date: 1998-05-06
Publication date: 1999-07-07
Anticipated expiration: 2008-05-06

Abstract

The utility model discloses a phase sequence detector. The utility model is characterized in that the phases A, B and C of a detection circuit are in a Y-shaped connection through capacitors or resistors, luminescent diodes and neon tubes; a capacitor C1 and a luminescent diode L1 are connected in series from the phase A to a connector, resistors R1, R2, neon tubes N1, N2 and luminescent diodes L2, L3 are connected in series from the phases B and C to connectors. The product has the advantages of small current, less power consumption, conspicuous display, indication for phase loss, simple structure, small size, convenient carrying and convenient operation, being an ideal phase sequence detector.

Description

A kind of phase-sequence detector

The utility model relates to the technical field of detecting instrument instrument, specifically a kind of detection, checks the instrument of three-phase power supply phase sequence and phase place.

The instrument that present Shanghai is used for the phase sequence measurement mainly contains the TG3 type, is that its theory structure that Jiading hat prestige company produces is similar to watt-hour meter, judges phase sequence with aluminium disc spins direction, not only the volume macrostructure is complicated, heavier, when measuring the 380V power supply, only allowed to insert for 10 seconds, use inconvenient, price is also more expensive according to the data introduction, there are a kind of 45 type phase sequence indicators in the U.S., also has complex structure, and volume is bigger, power consumption is higher, and does not have the phase shortage indication.

The purpose of this utility model is to provide phase-sequence detector simple in structure, easy to use, that indication is eye-catching.

The utility model adopts electric capacity, resistance phase shift network technology, seal in the A phase with electric capacity, and B, the C two-phase is an ohmic load, this just makes A, B two-phase voltage vector and modulus increase, and A, C two-phase voltage vector and modulus reduce, so just can determine A, B, the phase sequence of C three-phase, according to above design, the technical solution of the utility model is achieved in that a kind of phase-sequence detector, it mainly comprises housing, be contained in the A on the housing, B, C three-phase detection rod and be contained in testing circuit in the housing, it is characterized in that: the A of testing circuit, B, the C three-phase is respectively by electric capacity or resistance light emitting diode, neon tube, Y-shaped connection, A is serially connected with capacitor C 1 and light emitting diode L1 to node 0; B, C are serially connected with resistance R 1, R2, neon tube N1, N2, light emitting diode L2, L3 respectively to node 0.

This product adopts the RC phase shift technology that two little electric current neon bulbs and three situations that light emitting diode indicates every phase voltage to exist are arranged, and has the advantage that electric current is little, power consumption is little, demonstration is eye-catching and phase shortage is indicated, again because the input impedance height, compare safety, easy to use, the three-phase conductor one-shot measurement shows can determine phase sequence, and simple in structure, volume is little, be slightly larger than cigarette case, the about 300g of weight not only is easy to carry, price is 1/3 of a like product only, is a kind of comparatively desirable phase-sequence detector.

Fig. 1 is the outside drawing of the utility model one embodiment

Fig. 2 is the testing circuit figure among Fig. 1

Fig. 3 is A, B, C voltage in three phases UAB polar plot

Fig. 4 is A, B, C voltage in three phases UAC polar plot

The utility model will be further described below in conjunction with drawings and Examples

The utility model mainly comprises housing 2, be contained in A, B on the housing 2, C three-phase and relevant detection rod 1A (Huang), 1B (green), 1C (red) and be contained in testing circuit in the housing 2, it is different from prior art: testing circuit of the present utility model is the RC phase-shift circuit, detection A, B in the RC phase-shift circuit, C three-phase are respectively by resistance or electric capacity, light emitting diode, the Y-shaped connection of neon tube, A is connected in series capacitor C 1 and light emitting diode L1 successively to node 0 in an embodiment; B is to node 0 series resistor R1 successively, neon tube N1, light emitting diode L2; C is to node 0 resistance in series R2 successively, neon tube N2, light emitting diode L3; Wherein the negative pole of three light emitting diodes is connected and becomes node 0; For the ease of detecting, present embodiment all is arranged on three light emitting diodes and two neon tubes on the face-piece of housing.

This phase-sequence detector has adopted electric capacity, resistance phase shift network technology, electric capacity is sealed in the A phase, two big electric capacity are sealed in B, C two-phase respectively, make A, B two-phase voltage vector and modulus increase, and A, C two-phase voltage vector and modulus reduce, as shown in Figure 3, Figure 4, this phase-sequence detector determines that the phase sequence of A, B, C three-phase or the testing process of phase shortage are:

(1) is used to detect phase sequence

As Fig. 1,1A is arranged on the housing, 1B, three test bars of 1C, during measurement 1A (yellow) rod is contacted with the arbitrary conductor that needs to survey object, (for example contacting) with left conductor, this conductor (left conductor) is defined as the A phase, then 1B (green) rod is contacted with middle conductor, 1C (redness) rod contacts with right conductor, at this moment three light emitting diode L1, L2, L3 is luminous, if meanwhile neon lamp N1 is luminous and neon tube N2 extinguishes, then is illustrated as positive phase sequence, it is a measured conductor left side, in, the right side is respectively A, B, the C phase, otherwise, if neon tube N1 extinguish neon tube N2 luminous the explanation be negative phase sequence, promptly a left side, in, right conductor is respectively corresponding A, C, the B phase;

(2) be used to judge whether phase shortage

In the above-mentioned measurement, three light emitting diodes should be luminous when three test bars contact with power conductor, and are not luminous when certain light emitting diode, this phase phase shortage then are described, no-voltage;

(3) be used for the nuclear phase position of two sections buses communication switches, three conductors of establishing one section bus for clarity are respectively A1, B1, C1; Three conductors of two sections buses are respectively A2, B2, C2.(measuring) with 1C (red), 1B (green) test bar

Earlier 1A (red) is surveyed one section bus A1 of rod contact 380V phase conductor, again 1B (green) is surveyed rod and contact 380V two sections bus A2, B2, C2 conductor respectively successively, if A1-A2 voltage is 0 when measuring, (light emitting diode) L2, L3 do not work, and A1-B2, A1-C2 has voltage (light emitting diode) L2, L3 bright, illustrates that then two sections bus A are correct mutually corresponding; In like manner can measure B1-B2, C1-C2, thus make one section bus corresponding one by one with the phase place of two sections buses.Be absolute A, B, C phase, 1A (Huang) is not owing to insert so the L1 light emitting diode does not work all the time.

Claims

1. phase-sequence detector, it mainly comprises housing, be contained in A, B, the C three-phase detection rod on the housing and be contained in the interior testing circuit of housing, it is characterized in that: the A of testing circuit, B, C three-phase pass through electric capacity or resistance light emitting diode, neon tube respectively, Y-shaped connection, A is serially connected with electric capacity (C1) and light emitting diode (L1) to node (0); B, C are serially connected with resistance (R1, R2), neon tube (N1, N2), light emitting diode (L2, L3) respectively to node (0).

2. by the described a kind of phase-sequence detector of claim 1, it is characterized in that: the A of testing circuit is connected in series electric capacity (C1) and light emitting diode (L1) successively to node (0); B is connected in series electric capacity (C1) and light emitting diode (L1) successively to node (0); B is to node (0) series resistor successively (R1), neon tube (N1), light emitting diode (L2); C is to node (0) series resistor successively (R2), neon tube (N2), light emitting diode (L3); The negative pole of three light emitting diodes is connected and becomes node (0).