CN2431572Y - Pulse arbiter for testing pulse electric energy meter - Google Patents

Abstract

The utility model discloses a pulse discriminator for testing a pulse electric energy meter, which comprises a main circuit, the pulse input circuit, the digital tube displaying circuit and the keystroke circuit. The main circuit is the pulse comparison discriminating circuit, and the pulse input circuit, the keystroke circuit and the digital tube displaying circuit are respectively connected with the main circuit. The pulse discriminator carries out comparison discrimination through the pulse output of a standard meter and the examined meter and can accurately test whether the pulse output of the examined pulse electric energy meter is correct or not to ensure the accuracy of a power utilization centralization meter reading system. The utility model supports the popularization and the application of the centralization meter reading system and is suitable for power supply departments, technical supervision departments and pulse electric energy meter production units.

Description

The pulse arbiter that a kind of check pulse electric energy meter is used

The utility model relates to a kind of input instrument, the pulse arbiter whether especially a kind of pulse output that is used for the check pulse electric energy meter is correct.

Along with automatic meter reading system in the development of electric power system with apply, as the chief component of system, the pulse electric energy table is also more and more used.The pulse electric energy table converts power consumption signal to pulse output and is sent to the automatic meter reading system center, thereby realizes the metering of user power utilization amount is adjusted.But in practical operation, often find that the electricity consumption number have some electric energy meters to show is different on the electricity consumption number that shows on the kilowatt meter reading-out system and its register, analysis and research show that this is to make mistakes and cause owing to the impulse sampling of this pulse electric energy table.If this problem be mustn't go to solution, will directly have influence on the interests of user or power supply department, cause unnecessary loss and dispute.And be not specifically designed at present the whether correct testing instruments of pulse output of differentiating the pulse electric energy table.

The purpose of this utility model is to provide a kind of pulse of energy paired pulses electric energy meter to export the pulse arbiter that correctness is effectively differentiated check.

For achieving the above object, the pulse arbiter that a kind of check pulse electric energy meter of the utility model is used comprises main circuit, pulse input circuit, charactron display circuit and key circuit, described main circuit is that ratio of pulse length to the total cycle length is than judging circuit, described pulse input circuit comprises tested table pulse input circuit and standard scale pulse input circuit, described pulse input circuit, key circuit insert main circuit respectively, and the output terminal of described main circuit links to each other with the charactron display circuit.

The pulse arbiter that above-mentioned a kind of check pulse electric energy meter is used, described main circuit adopts a slice PIC16C54 one-chip CPU, described key circuit comprises a display key and a reset key, 2 pin of described PIC16C54 one-chip CPU connect tested table pulse input circuit, 1 pin connects the standard scale pulse input circuit, 13 pin and 4 pin connect display key and the reset key in the key circuit respectively, connect an external crystal-controlled oscillation on 16,15 pin; 17,18 pin are to show bit scan data output pin, and 6,7,8,9,10,11,12 pin are display segment scan-data output pins, and each data output pin all links to each other with described charactron display circuit.

The pulse arbiter that above-mentioned a kind of check pulse electric energy meter is used, described tested table pulse input circuit comprises impulse level changing and shaping input circuit parallel with one another and pulse direct input circuit two parts.

When adopting above-mentioned pulse arbiter paired pulses electric energy meter to test, the pulse output that utilizes a correct same specification or other the firm energy table higher than tested meter accuracy as ratio of pulse length to the total cycle length to standard (hereinafter to be referred as standard scale), with standard scale and operation continuously after tested pulse electric energy table loads identical voltage and current, the pulse arbiter is gathered the pulse output of each electric energy meter, and be input in the main circuit, main circuit is compared the output recurrence interval of every tested table and the output recurrence interval of standard scale, and the result is outputed on the charactron of display circuit and show.In the pulse cycle continuously identical approximately (can by the accuracy specification error of showing, as the different multiplying powers that should be multiplied by them of the electric energy constant of standard scale and tested table) during comparison, it is qualified promptly to declare this table; As once comparison difference occurring continuous in service needing only, it is defective promptly to declare this table.So by this pulse arbiter, whether the pulse output that can differentiate the check pulse electric energy meter very accurately is correct, thereby guarantee the accuracy of electricity consumption automatic meter reading system, protection user and power supply department both sides' interests reduce unnecessary loss and dispute.Being applicable rapidly of automatic meter reading system can be effectively supported in its use.Adopt two pulse input circuits parallel with one another in the pulse arbiter, can be at the input of the pulse under the different situations differentiation of testing, applicability is strong.

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail.

Fig. 1 is the circuit diagram of the pulse arbiter used of check pulse electric energy meter;

Fig. 2 is the program flow diagram of IC1 among Fig. 1.

As shown in the figure, the pulse arbiter that a kind of check pulse electric energy meter is used is made up of main circuit IC1, pulse input circuit, charactron display circuit and key circuit, main circuit IC1 is that ratio of pulse length to the total cycle length is than judging circuit, it adopts a slice PIC16C54 one-chip CPU, and its internal processes process flow diagram as shown in Figure 2.Its major function is to be used to measure the output recurrence interval of input pulse cycle and standard of comparison table and tested table and to handle button interrupt, produce scanning video data etc.At the pulse output of different pulse electric energy tables, the pulse input circuit of tested table comprises impulse level changing and shaping input circuit I parallel with one another and pulse direct input circuit II two parts.Impulse level changing and shaping input circuit I adopts a L1A (LM393) operational amplifier as level comparator, pulse incoming level to irregularity carries out level translation and shaping, R16, R17, R18 are 10K Ω in the circuit, and R19 is 2K Ω, and C5 is 1000PF; Pulse direct input circuit II is applicable to that pulse imports the pulse electric energy table of smooth standard, Z1 is a stabilivolt in this circuit, and IC is a 4N35 optocoupler, electricity buffer action in the time of can playing the pulse input, prevent the interference of other power supply, R14, R15 are 300 Ω in the circuit.The pulse input end of two pulse input circuits links to each other with 2 pin of CPU.The output pulse of standard scale then is input to 1 pin of CPU by the pulse input circuit III.In this section circuit, BG1 is a triode, and R20 is 100K Ω, and R21 is 5.1K Ω.Comprise a display key (DISP) and a reset key (REST) in the key circuit, display key links to each other with 13 pin (RB7) of IC1, and reset key links to each other with 4 pin (MCLR) of IC1, and R12, R13 are 10K Ω in the circuit, C1, C4, C6 respectively are 0.1uF, and C is 100uB/16.The charactron display circuit comprises figure place showing according to decoding scheme IC2 and two charactron IC3, IC4, and IC2 adopts a self-employed worker 4LS138 integrated package, shows that the bit scan data link to each other with A, the B pin of IC2 respectively from 17 (RA0), 18 pin (RA1) output of IC1; Then (RB0～RB6) output inserts two charactron IC3, IC4 to the display segment scan-data, and R1～R7 is 68 Ω, and R8～R11 respectively is 100 Ω from 6,7,8,9,10,11,12 pin of IC1.Meet an external crystal-controlled oscillation CR on 16 pin (OSC1) of IC1,15 pin (OSC2), C2, C3 respectively are 20PF; IC3, IC4 are two and show charactron.Press reset key, can make the IC1 initialization, restart relatively to differentiate; Press display key, then result (if any several missing pulses, the pulse of several mistake and count pulse etc.) can be presented on IC3, the IC4.Among Fig. 1, S1, S2, S3, S4, S5, S6 are connectors.In the entire circuit, Vcc=5v.Δ T can be set to a recurrence interval of standard scale ± 10%.The pulse arbiter can be installed on electric energy meter error verifying attachment or electric energy meter during use has good luck on the device always.

In the utility model, main circuit also can adopt other one-chip CPU, as long as its internal processes meets Fig. 2 flow process.Also can not adopt CPU, and use the general relatively judging circuit that other is connected into by element instead.

Claims (3)

1, the pulse arbiter used of a kind of check pulse electric energy meter, it is characterized in that, it comprises main circuit, pulse input circuit, charactron display circuit and key circuit, described main circuit is that ratio of pulse length to the total cycle length is than judging circuit, described pulse input circuit comprises tested table pulse input circuit and standard scale pulse input circuit, described pulse input circuit, key circuit insert main circuit respectively, and the output terminal of described main circuit links to each other with the charactron display circuit.

2, the pulse arbiter used of a kind of check pulse electric energy meter as claimed in claim 1, it is characterized in that, described main circuit adopts a slice PIC16C54 one-chip CPU, described key circuit comprises a display key and a reset key, 2 pin of described PIC16C54 one-chip CPU connect tested table pulse input circuit, 1 pin connects the standard scale pulse input circuit, and 13 pin and 4 pin connect display key and the reset key in the key circuit respectively, connects an external crystal-controlled oscillation on 16,15 pin; 17,18 pin are to show bit scan data output pin, and 6,7,8,9,10,11,12 pin are display segment scan-data output pins, and each data output pin all links to each other with described charactron display circuit.

3, the pulse arbiter used of a kind of check pulse electric energy meter as claimed in claim 1 or 2 is characterized in that described tested table pulse input circuit comprises impulse level changing and shaping input circuit parallel with one another and pulse direct input circuit two parts.