SU112402A1 - Device for automatic calibration of electric meters - Google Patents

Description

For automatic calibration of electric meters, devices are used that contain contactless impulse sensors of rotational speed of the movable meter system and an electromagnetic recording mechanism indicating the suitability of the meter being turned.

To check the sensitivity of such a counter, it is proposed to use a memory relay circuit that controls the recording mechanism and consists of two relays /

One of the relays is turned on by the first impulse of the sensor, self-blocked, and prepares the switching on of the second relay. The latter is triggered by the next pulse of the sensor, in s., Ss; a full revolution of the moving system will occur before the check circuit is turned off.

FIG. 1 shows a block diagram of the path of the inverter under load; in fig. 2 is a block diagram of a meter sensitivity calibration path.

The device allows for the mass automatic calibration of electric meters at several different loads, as well as the verification of their lack of a self-propeller and the establishment of the required sensitivity. Verification results are automatically recorded on certificate cards using printing devices.

The verification of the counter with the aid of the device proposed consists in comparing the readings of the counter being turned on / with the readings of the reference counter 2 connected to the same network. The latter is equipped with a photo camera that creates electrical impulses when the counter dial is rotated. Each of the countable counters also has a sensor 4 for supplying one electric pulse at each revolution of its disk (for example, using labels 5 of a radioactive substance deposited on the edges of the counters' disks). The pulses of a rotatable counter, amplified by an amplifier 6, are used to turn on and then turn off the electromagnetic mechanism 7, counting pulses, with a continuously suppressed counter and usi. NO 112402-2 -

amplifier 8 counts. The counting mechanism 7 counts the number of pulses delivered by the reference counter during one of several turns of the counter being turned. Switching on and off the circuit of the electromagnetic drive of the counting mechanism is carried out using the step switch 9, which, when the first pulse is applied by the checkable counter, turns on the counting circuit, and then, after the next pulse (or the set number of pulses), turns off the counting mechanism.

In addition to checking the operation of the counter under load, the device also checks for the sensitivity of the counter. Sensitivity is calibrated when a load counter is applied to the circuit, which corresponds to 1% of its reference value using a memory (Fig. 2) circuit consisting of two relays JO and 11. Relay 10 is triggered by a pulse generated by the counter 5 of the counter to be tested, and 1J when the next pulse arrives after one revolution of the counter disk. If the second relay is activated before a predetermined period of time, the electromagnet 12 of the printing mechanism 13 is turned on, indicating the validity of the counter; if the relay is activated after the expiration of the set time, the printing mechanism will mark the marriage.

Subject invention

1. A device for automatic calibration of electric meters, containing contactless pulse sensors of rotational speed of the movable meter system and an electromagnetic recording mechanism indicating the validity or unsuitability of the meter being tested, which is different from the fact that, in order to calibrate the meter for sensitivity, a memory relay circuit was applied A registering mechanism consisting of two relays, one of which is switched on with the first pulse of the sensor, self-blocks and prepares the activation of the second The operation of which is effected from the next pulse of the sensor in the event that a complete revolution of the moving system occurs before the entire verification scheme is turned off.

2. In the device of claim 1, use the electrical circuit for automatically presetting the signal mark on the moving system of the counter against the sensor element.

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