CN201589820U

CN201589820U - Simple and easy detection equipment for measuring three-phase alternating current phase sequence

Info

Publication number: CN201589820U
Application number: CN2010200411881U
Authority: CN
Inventors: 陶韬; 李利明
Original assignee: China Nonferrous Metals Processing Technology Co Ltd
Current assignee: China Nonferrous Metals Processing Technology Co Ltd
Priority date: 2010-01-11
Filing date: 2010-01-11
Publication date: 2010-09-22
Anticipated expiration: 2020-01-11

Abstract

The utility model discloses simple and easy detection equipment for measuring a three-phase alternating current phase sequence, which comprises a rising edge zero-crossing sampling circuit for acquiring a three-phase voltage, a sampling frequency selection circuit, timers, comparators and a display terminal; the sampling circuit can leads a first sampled voltage rising edge zero-crossing signal to respectively start a timer 1 and a timer 2 which are connected electrically by the sampling frequency selection circuit, and the started timer 1 and timer 2 are respectively and electrically connected with a clock circuit; the timing signals of the timer 1 and the timer 2 are respectively and electrically connected to a comparator 1 and a comparator 2; and the output signals of the comparator 1 and the comparator 2 are respectively and electrically connected with the display terminal. The simple and easy detection equipment has single-point power sampling, small calculation amount and simple system construction, and can measure three-phase alternating current in a common electronic type electroprobe.

Description

Measure the simple detection equipment of phase order of 3-phase AC

Technical field

The utility model relates to the phase sequence field of measuring technique of three-phase alternating current, is particularly useful for electrical construction, reaches a kind of simple detection equipment of measuring phase order of 3-phase AC that overhauls.

Background technology

At present, when electric installations such as transformer installation, motor wiring, maintenance, often need the phase sequence of three-phase main-frequency alternating current be measured, guarantee positive sort run or same-phase parallel running, avoid occurring the substantial equipment interruption of service.Existing phase sequence detection technique commonly used is by three-phase alternating current being sampled simultaneously, convert by comparison between rotating coordinate system and rest frame and phase place, determining the order of phase place.The sampling section of this method and phase calculation formula are comparatively complicated, can't realize on common electronic type electroprobe, can only be used for special-purpose phase order of 3-phase AC measuring instrument, make electric installation, maintainer increase labour intensity.

Summary of the invention

In order to overcome existing technical deficiency, simplify the phase sequence of three-phase main-frequency alternating current and measure, alleviate labour intensity electric, the maintainer.The utility model provides a kind of simple detection equipment of measuring phase order of 3-phase AC.This checkout equipment adopts the sampling of power supply single-point, and calculated amount is little, has integrated, miniaturization, system construction is simple, and can realize the measurement of three-phase main-frequency alternating current in electronic type electroprobe commonly used.

For achieving the above object, the utility model adopts technical scheme as described below:

The simple detection equipment of described measurement phase order of 3-phase AC has the three-phase voltage of collection rising edge zero passage sample circuit, sampling number selection circuit, timer, comparer and display terminal; Described sample circuit has the voltage rising edge zero cross signal of sampling for the first time, selects circuit to start the timer 1 and the timer 2 of electrical connection respectively by sampling number, and the timer 1 and the timer 2 of startup are electrically connected to clock circuit respectively; The timing signal of described timer 1 and timer 2 is electrically connected to comparer 1 and comparer 2 respectively; The output signal of described comparer 1 and comparer 2 is electrically connected to display terminal respectively.

The simple detection equipment of described measurement phase order of 3-phase AC, described timer 1 have the voltage rising edge zero cross signal that makes sampling for the second time and select circuit to make timer 1 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of the sampled voltage second time of comparer 1 comparison.

The simple detection equipment of described measurement phase order of 3-phase AC, described timer 2 have the voltage rising edge zero cross signal that makes sampling for the third time and select circuit to make timer 2 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of comparer 2 sampled voltage for the third time relatively.

The simple detection equipment of described measurement phase order of 3-phase AC can be arranged in the electronic type electroprobe commonly used.

Because adopt aforesaid technical scheme, the present invention has superiority as described below:

The simple detection equipment that this measures phase order of 3-phase AC has the sampling of power supply single-point, and calculated amount is little, and system construction is simple, can realize the measurement of three-phase main-frequency alternating current in electronic type electroprobe commonly used.

Description of drawings

Fig. 1 is the circuit block diagram of phase order of 3-phase AC measurement mechanism;

Embodiment

As shown in Figure 1: the simple detection equipment that this measures phase order of 3-phase AC has the three-phase voltage of collection rising edge zero passage sample circuit, sampling number selection circuit, timer, comparer and display terminal; Described sample circuit has the voltage rising edge zero cross signal of sampling for the first time, selects circuit to start the timer 1 and the timer 2 of electrical connection respectively by sampling number, and the timer 1 and the timer 2 of startup are electrically connected to clock circuit respectively; The timing signal of described timer 1 and timer 2 is electrically connected to comparer 1 and comparer 2 respectively; The output signal of described comparer 1 and comparer 2 is electrically connected to display terminal respectively.

Described timer 1 has the voltage rising edge zero cross signal that makes sampling for the second time and selects circuit to make timer 1 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of the sampled voltage second time of comparer 1 comparison.

Described timer 2 has the voltage rising edge zero cross signal that makes sampling for the third time and selects circuit to make timer 2 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of comparer 2 sampled voltage for the third time relatively.

The single-revolution wave phase mistiming of normal industrial-frequency alternating current is 0ms, 6.667ms, and three kinds of situations of 13.334ms can be determined A by the mode of phase time difference, B, the phase place of C three-phase and phase sequence situation.

Its principle of work, be when adopting univoltage rising edge zero passage sampling pattern, set first that the sampled voltage phase place is the A phase, though passed through one unfixed period when sampling for the second time, its time must add a single-revolution wave phase mistiming for the 20ms integral multiple.Therefore, just can obtain the single-revolution wave phase mistiming of sampled voltage for the second time, the single-revolution wave phase mistiming that in like manner can be sampled for the third time with the 20ms that samples for the second time and the sampling interval time T deducts an integral multiple for the first time.Can determine A by the mode of phase time difference thus, B, the phase place of C three-phase and phase sequence situation.

When this simple detection equipment of measuring phase order of 3-phase AC uses,, gather voltage rising edge signal when sampled voltage passes through voltage rising edge detection line; When confirming as when sampling first, this rising edge signal is used to start 20ms timer 1,2; It is the loop cycle timing that timer begins with 20ms; When confirming as when sampling for the second time, the voltage rising edge signal that samples is used to stop the timing of timer 1, and this timing result compares in comparer, obtains the phase result of sampled voltage for the second time; Use the same method and to obtain the phase result of sampled voltage for the third time; Last signal is delivered to display terminal and is shown.

Owing to only use single measurement point to detect in this structure and the detection of univoltage rising zero crossing, every data to voltage all do not need accurate measurement, and simple counter and comparer have only been used in the structure, so should measure the simple detection equipment of phase order of 3-phase AC, its system architecture brief introduction, be easy to miniaturized application, can be arranged in the electronic type electroprobe commonly used, the phase sequence and the phase measurement of three-phase alternating current.

Claims

1. a simple detection equipment of measuring phase order of 3-phase AC is characterized in that: have the three-phase voltage of collection rising edge zero passage sample circuit, sampling number selection circuit, timer, comparer and display terminal; Described sample circuit has the voltage rising edge zero cross signal of sampling for the first time, selects circuit to start the timer 1 and the timer 2 of electrical connection respectively by sampling number, and the timer 1 and the timer 2 of startup are electrically connected to clock circuit respectively; The timing signal of described timer 1 and timer 2 is electrically connected to comparer 1 and comparer 2 respectively; The output signal of described comparer 1 and comparer 2 is electrically connected to display terminal respectively.

2. the simple detection equipment of measurement phase order of 3-phase AC according to claim 1, it is characterized in that: described timer 1 has the voltage rising edge zero cross signal that makes sampling for the second time and selects circuit to make timer 1 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of the sampled voltage second time of comparer 1 comparison.

3. the simple detection equipment of measurement phase order of 3-phase AC according to claim 1, it is characterized in that: described timer 2 has the voltage rising edge zero cross signal that makes sampling for the third time and selects circuit to make timer 2 stop timing through sampling number, and the cycle is 20ms; The data-signal of this timing is electrically connected to display terminal through the phase signal of comparer 2 sampled voltage for the third time relatively.

4. the simple detection equipment of measurement phase order of 3-phase AC according to claim 1 is characterized in that: can be arranged in the electronic type electroprobe commonly used.