CN2676212Y

CN2676212Y - Digital display phase detector

Info

Publication number: CN2676212Y
Application number: CN 03246262
Authority: CN
Inventors: 刘源
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-07-30
Filing date: 2003-07-30
Publication date: 2005-02-02
Anticipated expiration: 2013-07-30

Abstract

The utility model discloses a digital display phase detector which comprises a main and an auxiliary detecting rods and a detecting circuit which comprises a sampling circuit, a rectification circuit and a digital display circuit, and the detecting circuit also comprises an input circuit, a filtering comparison circuit and a small signal removing circuit. The input port of the input circuit is connected with the output port of the rectification circuit, the output port of the input circuit is connected with the input port of the digital display circuit, the input port of the filtering comparison circuit is connected with the output port of the input circuit, one port of the small signal removing circuit is connected in the input circuit, and the other port of the small signal removing circuit is connected with the output port of the filtering comparison circuit. The digital display phase detector uses a comparator and the small signal removing circuit to remove interfering signals which influence test results so as to ensure that no wire is connected with the ground when the entire instrument is used, the using safety is ensured in a maximum way, digitals are used for displaying line voltage, and the digital displaying method is visual and convenient.

Description

Numeral shows nuclear phase instrument

Technical field

The utility model belongs to the device at phasing degree between the measuring voltage, relates in particular to the high-tension numeral of a kind of measurement and shows nuclear phase instrument.

Background technology

The high voltage long-distance transmission line mostly adopts three-phase alternating current system both at home and abroad.Electric substation after newly-built, renovating and enlarging and transmission line of electricity, and finish at line maintenance, before the user send electricity, all must carry out the test of three-phase line nuclear phase, consistent with the desired phase sequence of user's threephase load to guarantee the transmission line of electricity phase sequence, correct nuclear phase is the assurance of safety utilization of electric power.If the nuclear phase mistake is gently then burnt load, will cause line outage when serious, cause the tremendous economic loss.Along with the raising of line voltage distribution grade, system becomes increasingly complex, and makes the nuclear phase operation frequent and more important more.

Patent 97209596.9 discloses a kind of high pressure to the phase line detector, it comprises the master, secondary two test bars and the testing circuit that is separately positioned in two test bars, have rational in infrastructure, easy to carry, can simplify trace routine, advantages such as phase line identification is accurate, but it also has weak point: according to the regulation of up-to-date power industry standard, the occasion of high pressure is being arranged, all devices should link to each other with ground without any line in use, safe in utilization to guarantee, and this detector is in order to reduce noise jamming, in its sample circuit ground wire must be arranged, after removing ground wire, this high pressure to the phase line detector then because of being subjected to noise jamming, error rate is too high and can't use.

Summary of the invention

The purpose of this utility model provides and a kind ofly meets up-to-date power industry standard, links to each other with ground without any line in use and show nuclear phase instrument by the numeral of digital display line voltage.

For achieving the above object, the utility model adopts following technical scheme: a kind of numeral shows nuclear phase instrument, comprise the master, secondary two test bars and testing circuit, comprise sample circuit in the testing circuit, rectification circuit, digital display circuit, also comprise input circuit in the testing circuit, filter comparator circuit and small-signal cut-off circuit, the input end of input circuit links to each other with the output terminal of rectification circuit, the output terminal of input circuit links to each other with the input end of digital display circuit, the input end that filters comparator circuit links to each other with the output terminal of input circuit, one termination of small-signal cut-off circuit is gone into input circuit, and the other end links to each other with the output terminal that filters comparator circuit.

Described testing circuit also comprises light indicating circuit, and the input end of light indicating circuit links to each other with the output terminal that filters comparator circuit.

Described testing circuit also comprises voice comparator circuit and sound circuit, and the input end of voice comparator circuit links to each other with the output terminal of input circuit, and the input end of sound circuit links to each other with the output terminal of voice comparator circuit.

It also comprises display box, and the sample circuit in the testing circuit is arranged in the hollow hole of major and minor two test bars rod body, and other circuit in the testing circuit all is arranged in the display box.

Described input circuit is made of resistance R 5, R6, R7 and potentiometer W1, and R6, R7 connect successively with W1, and R5 is in parallel with R7, W1.

Described small-signal cut-off circuit is made of triode T1 and resistance R 24, resistance R 24 1 ends link to each other with the output terminal that filters comparator circuit, the other end links to each other with the base stage of T1, the T1 grounded emitter, and the common port of resistance R 7 and potentiometer W1 links to each other in collector and the input circuit.

Adopt the numeral of such scheme to show nuclear phase instrument, utilize comparer and small-signal cut-off circuit to remove the undesired signal that influences testing result, thereby can guarantee that whole instrument links to each other with ground without any line in use, guaranteed safe in utilization to greatest extent, and by digital display line voltage, intuitive and convenient.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1, the utility model has the master, secondary two test bars, the excellent body 2 on test bar top is made by the insulating material that has hollow hole, high-accuracy metalfilmresistor in the sample circuit is placed in the hollow hole, the survey hook of being made by the good conductor material 1 links to each other with metalfilmresistor, rod body 2 links to each other with effective insulated part 6 by connector 5, the portion of the handle 8 of test bar bottom links to each other with effective insulated part 6 by another connector 7, display box 4 is fixed on the excellent body 2 of main test bar, other circuit of in the testing circuit except that sample circuit all is arranged in the display box 4, and high-voltage conducting wires 3 couples together the sample circuit in the secondary rod and other circuit.

Certainly, display box 4 also can be placed on separately on the insulating frame, at this moment needs with two high-voltage conducting wires sample circuit and other circuit to be coupled together.

Below its principle of work is done to describe: as shown in Figure 2, two-phase high-tension electricity UH1 and UH2 are respectively by main, secondary test bar is surveyed hook 1 input, two the high-tension resistive R2s of high-voltage signal in pressure sampling circuit that come by main rod, R3 is connected in series with rectification circuit, secondary excellent pressure sampling circuit is to be linked to each other with resistance R 4 and another input end of rectification circuit in the main rod through high-voltage conducting wires 3 by a high-tension resistive R1, constitute a reduction voltage circuit, there is not ground wire herein, by intrinsic standoff ratio is the high-accuracy metalfilmresistor R1 that calculates at 1000: 1, R2, R3, R4 shares most of high pressure, obtain 0～10V left and right sides voltage on the rectification circuit, become corresponding low pressure end.Take out voltage signal from here, and send into the ac input end of bridge rectifier circuit.Full-wave rectifying circuit is made up of diode D1, D2, D3 and D4, through rectifying and wave-filtering, delivers to input circuit then, and input circuit is made of resistance R 5, R6, R7 and potentiometer W1, and R6, R7 connect successively with W1, and R5 is in parallel with R7, W1.Take out signal from potentiometer W1 and send into digital display circuit.

Digital display circuit is formed by connecting by chip U3, U6, resistance R 23, R25, R26, R27, R28, potentiometer W3, capacitor C 8, C9, C10, C11, C15, C16, diode D6, D8, D9 and two seven sections LED.Signal causes the A/D transducer through resistance R 23, converts tested voltage analog to digital quantity, through display driver circuit, shows to display.Display chip U6 and U3 adopt integral transform integrated

circuit

7107 and 4069 as analog to digital conversion and display driver, display is made up of two seven sections LED, the front two number that shows outlet voltage can be realized correction to accuracy of voltage displayed value and indication range by adjusting potentiometer W3.Signal becomes 0～100mV at this moment and introduces U6 input pin 31.The numerical value that shows on the display is exactly the voltage of being sent into by input circuit, just can judge that according to this numerical value tested two-phase high voltage is homophase or out-phase, same phase time, reading be approach 0 than fractional value, normally whether during out-phase, reading is exactly the line magnitude of voltage between the two-phase, to understand electrical network.

Simultaneously, take out signal from input circuit and after resistance R 8, R10, R9 dividing potential drop, deliver to filtration comparator circuit and voice comparator circuit, send into light indicating circuit and sound circuit then.Filtering comparator circuit is made up of comparer U1, resistance R 11, R12, R13, diode D7 and potentiometer W2, the voice comparator circuit is made up of comparer U2, resistance R 16, R17, R18, R19, R20, diode D11, triode T3 and potentiometer W4, and comparer U1 and U2 all adopt integrated NAND gate circuit LM393.Light indicating circuit is made up of resistance R 14, R15, triode T2, pilot lamp L1 and resistance R 21, R22, triode T4, pilot lamp L2.Sound circuit is made up of speech chip U5, power amplifier chip U4, resistance R 29, R30, capacitor C 12, C13, C14 and loudspeaker.

Signal is introduced from U1 inverting input 2, its in-phase input end 3 meets potentiometer W2, can set a fiducial value, by judging, comparing, when signal surpasses a certain value, the output terminal 1 of U1 becomes low level, and then the T2 base stage is a low level, T2 ends, the green indicating lamp L1 that is connected on its collector is gone out by bright becoming, and meanwhile, the output terminal 1 of comparer U2 also is a low level, then triode T3 is owing to reverse biased is ended, its collector presents high level owing to T3 ends, and at this moment, triode T4 is with regard to conducting, red led L2 just becomes bright by going out, expression has voltage.Simultaneously, draw 11 pin of the speech chip U5 of single line to the sound circuit at the collector of triode T3, U5 adopts the integrated recording of SR4812 to play speech chip, and high level triggers, promptly when the T3 current collection very high level, when red led L2 is bright, 11 pin of U5 are high level, 7 pin of U5 are the output terminal of speech chip, also are high level, and it links to each other with power amplifier chip U4, U4 adopts LM386, voice signal after amplifying by entering loudspeaker after the capacitor C 14 and making it send the voice sound of " correctly "; When the signal voltage of input circuit approaches 0, then the output terminal 1 of U1 is a high level, the T2 conducting, green indicating lamp L1 is bright, and U2 output terminal 1 also is a high level, then triode T3 is because of the forward bias conducting, the collector of triode T3 and circuit ground short circuit become low level, and triode T4 is owing to reverse biased is ended, then red led L2 goes out, and this shows that the voltage of surveying is 0 or approaches 0.With this with homophase or not the homophase two states show.Like this, strengthen judgement and caution by light indication and voice suggestion, thereby constitute a complete system.

Triode T1 and resistance R 24 constitute the small-signal cut-off circuit, one end of resistance R 24 links to each other with the T1 base stage, the other end links to each other with comparer U1 output terminal, the T1 grounded emitter, collector links to each other with the common port of resistance R 7 with potentiometer W1, when, error smaller when signal is big, U1 sends signal by comparer, make triode T1 conducting, then its collector and ground short circuit can stop the big signal of error to enter digital display circuit like this.

Adopt 5,6,7 pin and resistance R 31, R32, R33, R34, R35, R36, diode D10, triode T5, the pilot lamp L3 of comparer U1 to form battery voltage detection circuit in addition, cell voltage is detected, when cell voltage just often, 5 pin level are higher than 6 pin, 7 pin output high level, triode T5 conducting, the yellow indicator lamp L3 that then links to each other with collector is bright, shows the cell voltage abundance; When cell voltage was lower than a certain value, when promptly 5 pin were lower than 6 pin, its output terminal 7 pin produced a low level signal, and this moment, triode T5 ended, and the yellow indicator lamp that is connected on the collector does not work, and illustrates that cell voltage is low excessively, needs to change; Judge according to this whether battery has electricity, avoid the caused error of undertension.

In the circuit, potentiometer W2 is used to set small-signal excision value, and potentiometer W4 is used to set the minimum of audio alert.Entire circuit adopts 4 joint dry cells, i.e. 6V power supply.

The utility model can be held major and minor test bar respectively by two people and overlap two-phase into three-phase high-voltage in use, and then exchange measures other two-phases, can judge.

Claims

1, a kind of numeral shows nuclear phase instrument, comprise the master, secondary two test bars and testing circuit, comprise sample circuit in the testing circuit, rectification circuit, digital display circuit, it is characterized in that: also comprise input circuit in the testing circuit, filter comparator circuit and small-signal cut-off circuit, the input end of input circuit links to each other with the output terminal of rectification circuit, the output terminal of input circuit links to each other with the input end of digital display circuit, the input end that filters comparator circuit links to each other with the output terminal of input circuit, one termination of small-signal cut-off circuit is gone into input circuit, and the other end links to each other with the output terminal that filters comparator circuit.

2, numeral as claimed in claim 1 shows nuclear phase instrument, and it is characterized in that: described testing circuit also comprises light indicating circuit, and the input end of light indicating circuit links to each other with the output terminal that filters comparator circuit.

3, numeral as claimed in claim 1 or 2 shows nuclear phase instrument, it is characterized in that: described testing circuit also comprises voice comparator circuit and sound circuit, the input end of voice comparator circuit links to each other with the output terminal of input circuit, and the input end of sound circuit links to each other with the output terminal of voice comparator circuit.

4, numeral as claimed in claim 3 shows nuclear phase instrument, and it is characterized in that: it also comprises display box, and the sample circuit in the testing circuit is arranged in the hollow hole of major and minor two test bars rod body, and other circuit in the testing circuit all is arranged in the display box.

5, numeral as claimed in claim 4 shows nuclear phase instrument, and it is characterized in that: described input circuit is made of resistance R 5, R6, R7 and potentiometer W1, and R6, R7 connect successively with W1, and R5 is in parallel with R7, W1.

6, numeral as claimed in claim 5 shows nuclear phase instrument, it is characterized in that: described small-signal cut-off circuit is made of triode T1 and resistance R 24, resistance R 24 1 ends link to each other with the output terminal that filters comparator circuit, the other end links to each other with the base stage of T1, the common port of resistance R 7 and potentiometer W1 links to each other in the T1 grounded emitter, collector and input circuit.