SU1620967A2 - Apparatus for automatic checking of electricity meters - Google Patents

Abstract

The invention relates to a pulse technique. The goal is to expand the area of use of the device by operating in addition to the automatic mode in semi-automatic, as well as by automatically determining the sign of the resulting error. It is achieved by introducing into (L C - I - w k. О. 4D O y o VI b

Description

device of four blocks 31-34 keys, multiplexers 35, 36, n signaling devices Less than 37, n signaling devices More 38 and control buses. The device also contains n channels 1 of the account, each of which includes a photo sensor 2, the elements And 3 and 7, the inverter 4, the counter 5 input pulses, the counter 6 clocks ,. pulses, RS flip-flop 8, decoder 9 and multiplexer 10, and also contains 11 pulse generator, divider

12 frequencies, channel selection block 13, display blocks 14, 17. 19, remote control 15, memory blocks 16,18,20, block 21 of simultaneous monitoring of the permissible error of all electric power meters being turned on, including multiplexer 22, demultiplexer 23, the counter 24, the element OR 25, the digital comparators 26 and 27, the element And 28, the element OR 29 and n signaling devices In class 30. 1 Il.

The invention relates to a pulse technique and can be used when calibrating electricity meters.

The goal of izob, zteni is to expand the field of application of the device due to the operation of the device in addition to the automatic mode in semi-automatic, as well as due to the automatic determination of the sign of the resulting error.

The drawing shows a structurally functional diagram of the proposed device.

The device contains n channels 1 accounts, each of which contains a photo sensor 2, the first element And 3, inverter 4, counter 5 input Pulses, counter 6 clock pulses, the second element And 7, RS-flip-flop 8, decoder 9, multiplexer 10, and It contains a pulse generator 11, a frequency divider 12, a channel selection unit 13, a first display unit 14, a control panel 15, a first memory block 16, a second display block 17, a second memory block 18, a third one. the display unit 19, the fourth inline indication unit 20 and the simultaneous control unit 21 with the permissible error of all electric power meters being turned on, including multiplexer 22, first de-multiplexer 23, counter 24, first element OR 25, first 26 and second 27 digital comparators , element 28, second element OR 29 and p signaling devices In class 30. In addition, the device contains the first 31, second 32, third 33 and fourth 34 blocks of keys, and the second 35 and third 36 demultiplexers, n signaling devices Less than 37 and n alarm devices More than 38.

The device for automatic calibration of electricity meters works as follows.

For simplicity, consider the operation of one channel 1. In the initial state at the direct output of the first multiplexer 10 and, respectively, at the second inputs of the first 3 and second 7 logic elements And

there is 1. However, the clock counter 6 does not read the pulses arriving at its input from the generator 11 pulses through frequency divider 12 and the second element AND 7, since its setting R input has a prohibition of 1 from the inverse output of the RS flip-flop eight.

When a first pulse is received from the photo sensor 2 passing through the first

Element And 3 and Inverter 4, serving for

In order to counter 5 input pulses

could score only from the second pulse in

The purpose of the full reading of the first turn

drive electricity meter, RS-trigger

8, tilting, prepares the counter 5 input pulses for the account by applying to its installation R-input O and gives permission to the counter by the counter 6 clock pulses.

To automatically stop the input 5 and clock pulses of 6 pulses when the counter of 5 input pulses reaches the required number of readings of the disk speed of the electricity meter (and

multiplexer 10. To match the output of the 5 input pulses with the info-input input of the multiplexer 10, a decoder 9 is installed between them. When the 5 input pulses reach the required number of disk readings, the counter of the electricity counter specified by the multiplexer 10 at its address input is at the output of the multiplexer 10 is O, which causes the input counters to stop

5 and clock 6 pulses. Thus, at the end of the counting counter 6 clock pulses at the output keeps the received information. The work of the other channels of the account is similar.

Specifying the required number of reading revolutions of the electric power meter disk to multiplexer 10 at its address input is performed automatically by the first output of the first memory block 16 through the fourth key block 34, and in the semi-automatic one by the verifier using the sixth control panel 15 bus via the third key block 33.

The task of automatic or manual operation of the device is made, respectively, using the seventh and eighth tires of the control console 15, the first 31, second 32, third 33 and fourth 34 blocks of keys open when there are 1 control inputs on them and closed if O are present. To read the received information from the required counting channel to the first display unit 14, a channel selection unit 13 is used. The control unit 13 channel selection is carried out through the remote control 15 controls on its first bus. In the automatic mode, the verifier selects a certain bit of memory blocks corresponding to this type of electric power meters to be checked and their required regulated operation mode via the control panel 15 via the second bus connected to the bits of the first 16 and second 18 memory blocks. This reads the information presented in binary code from all the outputs of the first 16 and second 18 memory blocks at the same time. The verifier, according to the reference data taken from the fourth display unit 20, sets the required regulated operation mode of electricity meters on a calibration bench.

The second block 17 of the display informs the verifier about the number of revolutions of the electric power meter disk, which the device counts. In order to automatically compare the obtained values of the calibrated electricity meters with their permissible error, block 21 simultaneously controls the permissible error of all the calibrated electricity meters. The setting of the permissible error in the manual mode is carried out by the verifier through the fourth and fifth buses of the control panel 15, and in the automatic mode by the first and second outputs of the second memory block 18.

Consider the automatic mode of setting the permissible error (manual mode is similar). The first and second outputs of the second memory block 18 are set. respectively, the first 26 and second 27 digital comparators, by their inputs X, the lower XMin and the upper Hmax, are the limits of the permissible error of the electric power meters being turned, and this information is parallel to the third display unit 19.

When all input channels reach the required number of reading the revolutions of the electricity meter disks on all inputs and outputs of the first element OR 25, O. Level O will be present at all inputs and output of the first element OR 25

the first logic element OR 25 converts the multiplexer 22, the first 23, the second 35 and the third 36 demultiplexers from the third high-impedance state to normal operation, and also enables the counter 24, which serves to match the information inputs of the multiplexer 22 with the corresponding information outputs of the first 23, second 35 and third 36 demultiplexers.

On the counting input of the counter 24 arrivals m pulses from the generator 11 pulses through the divider 12 frequency.

When a binary code 24 corresponding to digit 1 is set at the output of the counter, multiplexer 22 connects the output of the counter to 6 clock pulses of the first counting channel, and the first 23, second 35 and third 36 demultiplexers connect the first signaling devices in class 30 to their information outputs, Less than 37 and more than 38.

When the Y value of the counter of 6 clock pulses is found within Hmin Y Xmax, the output of the second logic element OR 29 and, accordingly, the first output of the first demultiplexer 23 has level 1, which enables the first signaling device to be used. In class 30, if it is or Hmaks ,,

that accordingly, the first alarm less than 37 or the first alarm more than 38 work.

When the output of the counter 24 binary code corresponding to the digit

2, the block 21 of simultaneous monitoring of the permissible error of all calibrated electricity meters performs verification on the second channel of the account, similarly to verification on the first channel of the account. Verification of the remaining channels of the account is identical.

When the readout of the nth calibrated electricity meter reads out of the permissible error class (reported by alarms 37 and 38), the verifier via the console 15

control over its first bus associated with the control output of the channel selection unit 13, causes the first measured indication value of the nth turnable electricity meter to the first indication unit 14, then visually compares the obtained value with a valid value using the first 14 and third 19 display units . In order for the device to return to its original position, the verifier, via the control panel 15, via its third bus connected to the R-BXOs of the RS flip-flops 8 of each counting channel, gives a short-term impulse O.

The use of key blocks, the fourth, fifth, sixth, seventh, and eighth control buses allows you to turn off electricity meters, the data of which are not stored in the memory blocks of the device, which significantly reduces the verification operation. The use of the second and third demultiplexers, as well as the Smaller and More signaling devices, makes it possible to shorten the time for determining the sign of error in electricity meters whose readings have gone beyond the limits of permissible error.

Claims (1)

The invention The device for automatic calibration of electricity meters according to ed. St. No. 1492328, characterized in that, in order to expand the scope of application, four blocks of keys, two multiplexers, n smaller signaling devices, n more signaling devices, and control panels from the fourth to eighth buses are introduced into it, the first and second combined outputs first and second blocks the keys are connected to the corresponding inputs X of the first and second digital comparators, the first and second inputs of the first key block are connected to the fourth and fifth control panel buses, the first and second inputs of the second key block are connected to the corresponding first and second outputs of the second memory block, the third inputs and the fourth key block are connected respectively to the sixth bus of the control panel and the first output of the first memory block, the outputs of the third and fourth key block are interconnected and connected to the address input m multiplexers of each counting channel, the combined control inputs of the first and third, second and fourth key blocks are connected to the seventh and eighth control panel buses, respectively, and the second and third demultiplexers introduced by the inputs are connected to the YX outputs of the first and YX second digital comparators The nth number of outputs of the second and third demultiplexers are connected respectively to the nth number of the Alarms Less and More.