CN2147542Y

CN2147542Y - Scan digital display three-phase electric voltage (current) meter

Info

Publication number: CN2147542Y
Application number: CN 92221116
Authority: CN
Inventors: 杨金贵
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-24
Filing date: 1992-09-24
Publication date: 1993-11-24
Anticipated expiration: 2002-09-24

Abstract

The utility model discloses a scan digital display three-phase voltage (current) meter which is composed of a meter casing, a display panel and an electronic circuit arranged in the meter casing. A digital displaying screen which can display the three-phase voltage value of alternating current A, B, C or current value by turns and can indicate a red luminous tube, a green luminous tube and a blue luminous tube with corresponding phase positions is arranged on the display panel. The electronic circuit is composed of a three-phase detecting voltage divider, an electronic switch with one selected among three, a pulse generator, a scanning monitor, a three-position digital panel meter, a phase position indicator and a power circuit. The scan digital display three-phase voltage (current) meter is suitable for indicating three-phase voltage or three-phase current on a low-voltage distribution switch cabinet (board) of an industrial electric network. The reading of the meter is clear and visual. The precision is high. One meter can simultaneously indicate three-phase voltage or current. The function of one meter of the utility model is equal to the function of the three existing meters.

Description

Scan digital display three-phase electric voltage (current) meter

The utility model relates to a kind of read out instrument that is used for display industry electrical network A, B, C three-phase voltage value or three-phase electricity flow valuve, is specially adapted to do on industrial electrical network low-voltage distribution switch cubicle the indication of three-phase voltage or three-phase current.

Voltage and electric current Displaying Meter are indispensable instrument in the power industry, prior art normally adopts three voltage tables or reometer to monitor and display industry electrical network A, B, C three-phase voltage or current value respectively, owing to will use three tables, not only cost height, and installation and maintenance are all not too convenient.

The purpose of this utility model is will develop a kind ofly to replace existing three tables with a table, with scan mode in turn stream show the read out instrument of A, B, C three-phase voltage value or three-phase electricity flow valuve.

The explicit three-phase voltage of the number of scans that the utility model provides (electric current) table, constitute by watchcase, display panel and the electronic circuit that is contained in the watchcase, have one can show the digital display screen of alternating current A, B, C three-phase voltage value or current value in turn on the display panel, and indicate three luminotrons of red, green, blue, the electronic circuit of respective phase to select an electronic switch by three-phase detection voltage divider 1, three.2, pulse producer 3, scanning monitor 4, three bit digital panel tables 5, electrogoniometer 6 and electric current 7 constitute (as shown in Figure 1), the input end of three-phase detection voltage divider is connected (making voltage table) with the three-phase phase line of alternating current or is connected (making reometer) with the Secondary Winding port of three current transformers according to the purposes (V/A selection) of table, and output terminal selects an electronic switch to be connected with three bit digital panel epiphases through three; The input end of scanning monitor is connected with surge generator, and output terminal and three selects an electronic switch and electrogoniometer to be connected.Three-phase detection voltage divider constitutes (as shown in Figure 2) by diode D1, D2, D3 and resistance R 1, R2, R3, R4, R5, R6, the positive pole of D1, D2, D3 is connected with the Secondary Winding end of the same name of alternating current three-phase phase line UA, UB, UC or A, B, three current transformers of C respectively, negative pole selects the O end of three electronic switches in the electronic switch to link to each other through resistance R 1, R3, R5 and three respectively, resistance R 2, R4, R6 are in parallel with R1, R3, R5 respectively, are connected with three bit digital panel table M after 2 ends of three electronic switches are interconnected.Scanning monitor 4 is made of integrated circuit (IC) 2, three defeated end Q0, Q1, the Q2 of IC2 select 1 end of three electronic switches in the electronic switch to be connected with three respectively, port Q3 communicates with port R, and port C is connected with the delivery outlet that the integrated circuit (IC) 3 of device is sent out in the composition pulse.Electrogoniometer is by LED 1, LED2, LED3, triode BG1, BG2, BG3 and resistance R 7, R8, R9 constitute, the base stage of BG1, BG2, BG3 is connected with Q0, Q1, the Q2 port of IC2 through resistance R 7, R8, R9 respectively, emitter is connected with LED1, LED2, LED3 respectively, and collector is interconnected afterwards and 6 volts of direct current pressure sides that power circuit provides are connected.Three select an electronic switch to adopt integrated circuit CD4066, and scanning monitor adopts integrated circuit CD4017, pulse generation mouth to adopt integrated circuit CD40106 and resistance R 10 capacitor C to constitute.

The utility model is according to the difference of input end inlet wire, can make voltage table or reometer uses, when making the three-phase voltage table, its three input terminals meet AC network A respectively, B, C three-phase phase line, ground termination zero line, when making the three-phase current table, its three input terminals meet A respectively, B, the end of the same name of the Secondary Winding of three current transformers of C, the other end of three Secondary Winding then is communicated with the back earth terminal, Here it is, and V/A selects, the alternating voltage of input selects on the input end of three electronic switches of an electronic switch through being added to three after the three-phase detection voltage divider detection dividing potential drop, three electronic switches are logical at the control lower whorl conductance of scanning monitor, corresponding phase voltage delivered on the three figure place panel tables show, simultaneously, it is bright that scanning monitor is also controlled the pilot lamp that shows corresponding phase line in the respective phase indicator, adjusts the R of pulse producer, the C value can change the interval time that shows in turn.

From top narration as can be seen, the utility model has adopted with scan mode and has shown A in turn, B, C three-phase voltage value or three-phase electricity flow valuve, red with the indication respective phase, green, yellow luminotron is indicated A respectively, B, three phases of C, show with digital form, thereby realized replacing three original tables with a table, and clear reading is directly perceived, the precision height, can be used as the upgraded product of the voltage and current indicating instrument of industrial electrical network low-voltage distribution switch cubicle (plate), use various new instrument, can make the overall panel concision and compact of switch cubicle, installation is simplified, maintenance is also than original convenience, and reliability is improved, thereby the class of low-voltage distribution switch cubicle (plate) is stepped to a new level.

As an embodiment of the present utility model, Fig. 2 is circuit theory diagrams, and three-phase detection voltage divider is by D1-D3 among Fig. 2, and R1-R6 forms, and three select an electronic switch, are served as by CD4066.Pulse producer is made up of IC3CD40106 and R10, C.Scanning monitor, CD4017 serves as by decimal system sequential circuit, during application the Q3 output terminal is fed back to the R end and makes it to become the three-shift scanning generator.M is 3.5 bit digital panel tables, it is a kind of ready-made commercial approved product, mainly change by A/D, drive integrated circult CD7107,3.5 digitizing tablet and resistance, appearance element are formed, when practical application, also can make demonstration eye-catching more clear according to using place (or customer requirements) to select the large LED charactron for use.Electrogoniometer is made up of LED1-LED3 and respective drive circuit BG1-BG3, R7-R9 and R11 etc., and power supply is by 220V/6V power transformer and bridge rectifier, compositions such as filter capacitor.As can be seen from Figure, the three-phase input is through the D1-D2 detection, after the R1-R6 dividing potential drop, be added on the input end of three electronic switches again, the connection of three electronic switches with otherwise controlled by IC2Q0, Q1, Q2, three output terminals, when a certain end of Q0-Q2 is level"1", the electronic switch of its control end that connects is switched on, and corresponding detection branch pressure voltage is admitted to three bit digital panels and is shown.Because Q0-Q2 is when controlling three electronic switches respectively, control the light emitting diode of indicating respectively as phase place through another road, therefore control LED1-LED3 correspondingly lights, can be from LED1-LED3(subscript A, B, C three words) illuminating state read corresponding A, B, C three-phase voltage value or three-phase electricity flow valuve.

R, the C value of adjusting pulse producer can change when showing in turn, generally are advisable with 5-15S.Fig. 3 is the panel figure of the utility model when using as voltage table, and when being used as the three-phase current table, its " V " word then changes " A " word into, and " three-phase voltage table " title changes " three-phase current table " into, and model changes " DLC-1 " into.

Claims

1, the explicit three-phase voltage of a kind of number of scans (electric current) table, by watchcase, display panel and the electronic circuit that is contained in the watchcase constitute, it is characterized in that: have one can show alternating current A in turn on the display panel, B, the numeral of C three-phase voltage value or current value shows the storehouse, and the indication respective phase is red, green, blue three pieces of luminotrons, electronic circuit is by three-phase detection voltage divider 1, three choosing-electronic switches, 2, pulse producer 3, scanning monitor 4, three bit digital panel tables 5, electrogoniometer 6 and power supply 7 constitute, the input end of three-phase detection voltage divider is connected (making voltage table) with the three-phase phase line of alternating current or is connected (making reometer) with the Secondary Winding port of three current transformers according to the purposes (V/A selection) of table, and output terminal selects an electronic switch to be connected with three bit digital panel epiphases through three; The input end of scanning monitor is connected with surge generator, and output terminal and three selects an electronic switch and electrogoniometer to be connected.

2, voltage according to claim 1 (electric current) table, it is characterized in that: three-phase detection voltage divider is by diode D1, D2, D3 and resistance R 1, R2, R3, R4, R5, R6 constitutes, D1, D2, the positive pole of D3 respectively with alternating current three-phase phase line UA, UB, UC or A, B, the Secondary Winding end of the same name of three current transformers of C is connected, negative pole is respectively through resistance R 1, R3, R5 and three selects the O end of three electronic switches in the electronic switch to link to each other, resistance R 2, R4, R6 respectively with R1, R3, R5 is in parallel, and is connected with three bit digital panel table M after 2 ends of three electronic switches are interconnected.

3, voltage according to claim 1 (electric current) table, it is characterized in that: scanning monitor 4 is made of integrated circuit (IC) 2, three output terminal Q0, the Q1 of IC2, Q2 select 1 end of three electronic switches in the electronic switch to be connected with three respectively, port Q3 communicates with port R, and port C is connected with the delivery outlet that the integrated circuit (IC) 3 of device is sent out in the composition pulse.

4, voltage according to claim 1 (electric current) table, it is characterized in that: electrogoniometer is by LED 1, LED2, LED3, triode BG1, BG2, BG3 and resistance R 7, R8, R9 constitute, the base stage of BG1, BG2, BG3 is connected with Q0, Q1, the Q2 port of IC2 through resistance R 7, R8, R9 respectively, emitter is connected with LED1, LED2, LED3 respectively, and collector is interconnected afterwards and 6 volts of direct current pressure sides that power circuit provides are connected.

5, voltage according to claim 1 (electric current) table, it is characterized in that: three select an electronic switch to adopt integrated circuit CD4066, scanning monitor adopts integrated circuit CD4017, and pulse producer adopts integrated circuit CD40106 and resistance R 10 capacitor C to constitute.