CN2040648U

CN2040648U - Digital ac voltage current transformer

Info

Publication number: CN2040648U
Application number: CN 88214038
Authority: CN
Inventors: 王都魁; 张广祯
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-09-16
Filing date: 1988-09-16
Publication date: 1989-07-05

Abstract

The utility model discloses a digital AC voltage current transformer, which is formed by adding a digital face plate meter and an automatic alarm self-cut load circuit board for the over voltage, the over current and phase loss to the existing AC voltage current transformer. The utility model can automatically cut-off the load at the over voltage, the over current and the phase loss state, so as to protect the load away from the damage. The phase loss, the over voltage (or the over current) of the apparatus are finished by the window comparator A3 and A4. The numerical value of the phase loss, the over voltage (or the over current) are set-up by the advancing and guiding adjustments W3, W4. Except using digits to display the real AC voltage (electric current) of the site, the alarming and the disconnection of the load are controlled by the relay J1 or J2 which is driven by the high potential output through the A3 or A4.

Description

Digital AC voltage current transformer

The utility model belongs to alternating voltage, current transducer is made the field.

Prior art in the utility model prior art field is: the alternating voltage of being sold, current transducer in the market can only be used for being connected with microcomputer and inserting the Displaying Meter system, and can not directly show tested AC signal.Thereby it is required to be difficult to satisfy the user.

Purpose of design of the present utility model is: at weak point of the prior art, design and a kind ofly both can show power frequency ac voltage, current effective value, can report to the police automatically when overvoltage, the overcurrent phase failure again and cut off digital AC voltage, the current transducer of load.

Design proposal of the present utility model is: report to the police automatically and cut off the load circuit plate and constitute digital AC voltage, current transducer by increasing digital panel meter and overvoltage, overcurrent, the phase failure on the basis of existing alternating voltage, current transducer.Its digital panel meter is fixed on the inboard of housing face-plate and shows by the gauge outfit of the gauge outfit display aperture on the housing face-plate with digital panel meter.The power lead-ining line of digital panel meter and signal inlead connect adjustable end, the earth terminal of supply voltage joint and W2 respectively.Overvoltage, overcurrent, the phase failure are reported to the police automatically and are cut off the load circuit plate and be fixed on the underframe of inner casing by bearing, potentiometer (W4 is set in its overvoltage, overcurrent, the phase failure, W5) end ground connection and divider resistance (R6, R7) to voltage+12 volt, (R6, R7) termination power+12 of link and R10 volt, 2 pin of another termination comparer A3.(collector meets (D12 for BG1, grounded emitter BG2), D13) positive pole, (LED1, negative pole LED2) and (J1, end J2), another termination power+12 of the negative pole of (D112, D12) and (J1, J2) volt, and (LED1, positive pole LED2) connects the positive pole of LED3.Its principle of work: 1. digital display part: demarcate 5V output by W2, receive the input end of emitter follower A1, A1 plays buffer action, demarcates 50mv through R4 and W3 voltage divider.Be input to the input end of digital panel meter, the full scale of panel table is 50mv.Just 500

Or 500

2. overvoltage, overcurrent, the phase failure are reported to the police automatically and are cut off the load circuit plate portion: demarcate the input end that the 5V signal is input to emitter follower A2 equally by W2, to window comparator A3 and A4, served as by A3 and A4 respectively by the phase failure and superpressure (or super stream) signal output comparator through R5 for its A2 output signal.The concrete warning numerical value of demarcating is set arbitrarily respectively by W4 and W5 respectively.When the operation of the electric system phase failure or superpressure, A3 or A4 output noble potential force J1 or J2 adhesive, light the LED1(Huang simultaneously) or LED2(red) light emitting diode; When electric system normally moved, J1 and J2 were operated in non-attracting state.Therefore the normally closed contact of J1 and J2 is lighted normal light emitting diode (green) by being serially connected in one, if having one undesired, the green LED current path will be cut off by relay.3. relay J 1 and J2 externally have one group of output respectively.Can disconnect or connect external load circuit, can bear 220V voltage, the 5A electric current.Surpass 5A as user's electric current, can install auxiliary reclay voluntarily additional.

The utility model compared with prior art; because having set up digital panel meter and overvoltage, overcurrent, the phase failure reports to the police automatically and cuts off the load circuit plate; thereby not only can show the effective value of tested AC signal intuitively; and can cut off load automatically under overvoltage, overcurrent, phase failure state, thereby the protection load is not damaged.

Description of drawings:

Fig. 1 is that the master of digital AC voltage, current transducer looks synoptic diagram.

Fig. 2 is digital AC voltage, current transducer structural representation.

Fig. 3 is the circuit diagram of digital AC voltage, current transducer.

Embodiment:

Fig. 1-Fig. 3 is a kind of embodiment of digital AC voltage, current transducer.

The enforcement of digital AC voltage, current transducer: at first make shell, the 5th part and accompanying drawing assembling post debugging gets final product to specifications then.

Claims

1, a kind of digital AC voltage, current transducer, it is characterized in that: on the basis of existing alternating voltage, current transducer, report to the police automatically and cut off load circuit plate 3 and constitute by setting up digital panel meter 2 and overvoltage, overcurrent, the phase failure, its digital panel meter 2 is fixed on the inboard of housing face-plate 1 and shows by the gauge outfit of the apparent hole of the gauge outfit on the housing face-plate with digital panel meter, the power lead-ining line 6 of digital panel meter, signal inlead 7 connect adjustable end, the earth terminal 8 of supply voltage joint 5 and W2 respectively; Overvoltage, overcurrent, the phase failure is reported to the police automatically and is cut off load circuit plate 3 and be fixed on the underframe of inner casing 4 by bearing, its overvoltage, potentiometer (W4 is set in the phase failure, W5) end ground connection and divider resistance (R6, R7) to voltage+12 volt, (R6, R7) termination power+12 of link and R10 volt, output terminal 8 pin of the termination emitter follower A2 of R5,2 pin of another termination comparer A3, and (BG1, BG2) grounded emitter, collector meets (D12, D13) positive pole, (LED1, LED2) negative pole and (J1, end J2), (D12, D13) negative pole and (J1, J2) another termination power+12 volt, and (LED1, positive pole LED2) connects the positive pole of LED3.

2, digital AC voltage according to claim 1, current transducer is characterized in that: relay J 1 and J2 externally have one group of output respectively.