CS240220B1 - Connection of the maximum demand monitor from the power grid - Google Patents

Abstract

The wiring relates to a maximum power take-off device that disconnects the individual load lines when exceeding the permissible consumption. It only responds to the active current that is critical to power transmission. The sync output of the synchro detector is connected to the trigger input of the disconnector, whose output is connected to the input of the forward counter, with the counter outputs connected to the inputs of the decoder. The output of the warning signal and the output terminals to disconnect the power load branches are connected to the decoder output.

Description

(54) Maximum power take-off connection i

The connection concerns a maximum power consumption monitor which disconnects individual branches of the energy load when the permitted consumption is exceeded. It only reacts to the active current, which is critical for power transmission.

The output of the sync detector is connected to the trigger input of the disconnect multivibrator, the output of which is connected to the input of the counter for forward counting, the outputs of the counter being connected to the inputs of the decoder. The output signal terminals of the decoder and the output terminals for disconnecting the power load branches are connected to the output of the decoder.

The invention relates to the connection of a maximum consumption monitor from the power grid which, when the permitted consumption is exceeded, gradually and selectively disconnects the branches of the energy load.

The current consumption monitors disconnect the branches of the energy load depending on the total current drawn, thus reacting also to the reactive current that does not produce power, is not measured and registered with a 15-minute maximum and often disconnects the entire consumption without warning.

These drawbacks are eliminated by the connection of the maximum power consumption monitor according to the invention, wherein the output of the synchronizer is connected to the trigger input of the disconnect multivibrator, the output of which is connected to the input of the counter for forward counting. terminals for disconnecting the energy load.

By using the synchrodetector as a sampling sensor, a more accurate watchdog function is achieved, which responds only to the active current. This is also determined by the customer and is decisive for power transmission. Another advantage of the solution according to the invention is the signaling of an endangered branch whose consumption can be limited in time and thus prevent its possible disconnection.

The wiring of the guard according to the invention is shown in the attached drawing.

The synchro detector 3 with the input current and voltage terminals 1, 2 is connected to a disconnecting multivibrator 4, which is further connected to the input of the counter 6 for forward counting. The outputs of the counter 6 are coupled to the inputs of the decoder 7, which has output terminals 81, 82 to 8n of the alarm signal and output terminals 91, 92 to 9n for disconnecting the branches of the power load. In case the counter 8 is reversible, a multivibrator 5 is connected to its reverse counting input, which is connected in parallel to the multivibrator 4.

Synchrodetector 3 evaluates the size of the synchronous, ie the real component of the drawn current. The DC output of the synchrodetector 3 is routed to the isolation multivibrator 4, which begins to generate pulses when the input DC voltage of the threshold value is reached. The state of the counter 8 is determined by the number of pulses from the multivibrator 4 and indicated by a combination of logic signals at the outputs connected to the inputs of the decoder 7. The decoder 7 may consist of a PROM programmed such that a signal is output to the first endangered alarm output terminal 81, for the state two, the output of the first branch disconnect terminal 91 is output, and to the second branch endanger alarm output terminal 82.

In this way, the individual branches are gradually disconnected, and their reconnection after a drop in demand in the branches that remain connected is possible either manually or automatically. The automatic connection is provided by the connection multivibrator 5, which starts sending pulses when the demand drops below the selected limit.

A higher DC voltage at its input blocks it. The thresholds of both multivibrators 4 and 5 create a pulse-free area between them, which must be wider than changing the input voltage when disconnecting the branch with the most power. Therefore, it is advantageous for automatic coupling to divide the demand into a plurality of branches with a small, approximately equal, maximum demand. Warning signals can trigger optical or acoustic signaling.

The circuit-breaker used in the invention can be used wherever it is necessary to keep the power supply within the required limits.

Claims (2)

Subject 1. A maximum power take-off circuit, characterized in that the output of the synchrodetector (3) is connected to the trigger input of the disconnecting multivibrator (4), the output of which is connected to the input of the counter (6), the outputs of the counter (6) being connected to the inputs of the decoder (7), to which the output terminals (81, 82 to 8nj) of the warning signal are further connected, and to invent the output terminals (91, 92 to 9nj) to disconnect the power load branches. 2. The maximum power consumption monitor according to claim 1, characterized in that the counter (6) is reversible and its reverse counter input is connected to the output of the connecting multivibrator (5), which is connected to the output of the synchrodetector (5). 3).