SU1520453A1 - Method and apparatus for recording maximum loading of electric network - Google Patents

Abstract

The invention relates to electrical engineering and can be used in monitoring and measuring the load on the electrical network. The aim of the invention is to improve the accuracy of recording the maximum load of the electrical network. The method is implemented in a device comprising a load sensor 1, integrators 2.1 ... 2N, a selector 3 of the maximum load value, a memory block 4, an indicator 5, a clock generator 6, a control block 7. The device measures the load on the electrical network for the monitoring interval and compares it with the maximum load value for the same monitoring interval, as well as for selected subsequent intervals that are less than the monitoring interval. 2 sec. f-ly, 2 ill.

Description

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The invention relates to electrical engineering and can be used in the control and measurement of contaminated electrical networks.

The purpose of the invention is to improve the accuracy of the recording of the maximum load of the electrical network.

The essence of the method for registering the maximum load on an electrical network is as follows. The time interval T is divided by pa of n intervals At, and at the beginning of each interval At one of n integrators is turned on. With a time interval T, the readings of this integrator are compared with the previously recorded maximum load value. If the new load value exceeds the previously recorded one, it is taken as the maximum. After this, the integrator is reset and the current load value of the element being monitored is reconnected to its input terminals.

FIG. 1 is a graph showing the measurement of the electrical network load in FIG. 2, a block diagram of a device implementing the method for registering the maximum electrical network load.

The device contains a load sensor 1, integrators 2о1оо2 П P5 selector 3 maximum load load, memory block 4, indicator 5, generator 6 clock pulses and control block 7, with the output of load sensor 1 connected to the information inputs of integrators 2Л; oo2оP, output The 6 clock pulse generator is connected to the input of the control unit 7, the outputs of which are connected to the control inputs of the integrators 2 "1s..o2op, the outputs of which are connected to the inputs of the selector 3 maximum value, the output of which through the 4 memory unit is connected to ind Katori 5 block output memory 4 is also connected to the (n + 1) - Valid voter 3 maximum load values.

The device, which implements the method of registering the maximum load of the electrical network, works as follows.

Load sensor 1 converts the power or load current of the monitored element of the electrical network into a measuring parameter (current, voltage, number-pulse code), Integra

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tori 2o2o, n integrate the load, and a constant value is present at their outputs, proportional to the load integral for the period from the moment the integrator was switched on to the current point in time. The outputs of all the integrators are connected to the inputs of the maximum 3 selector; n-1 load causes The load on the (n-1) -input of the selector 3 of the maximum load is the output of memory block 4, whose input is connected to its output. At the output of the selector 3, the maximum load value always has the largest load value, which is either contained in memory block 4, or is found in one of the integrators 2.1 „„ „2„ n. This maximum load value of the element being monitored is shown in block 4 Memory and POS1 is activated by the indicator 5 o. The generator of 6 clock pulses with an interval At generates pulses arriving at the input of the control unit 7. The outputs of the blasting control alternately cyclically with an interval equal to the integral between the clock pulses send a signal to the control input of the next integrator 2.1.2 "p. With this signal, the contents of the integrator 2c, 1, o.2 "n vanish" Since the number of integrators, each integrator 2 "1" "2" n turns on for period T. After a time T, the contents of the integrator 2 "1 ... 2 , n goes to zero, and it integrates the load again during the period T. When the device is turned on, the first integrator turns over the first clock pulse, through the time & t - the second integrator, again through ut - the third and Tod. Re-zeroing of the first integrator will occur in time T, the second through T + ut, it also turns on for time T. Thus, the load is integrated in the device during time T, and the integrators are connected at intervals t.

Claims (2)

Invention Formula 1 o The method of recording the maximum load of the electrical network, which consists in measuring the value of the load on the electrical network during the monitoring interval T, compare it with the maximum load value the electrical network for the same monitoring interval T, obtained for all the previous monitoring time, replaces the maximum load value by the measured value, in case the last maximum value is exceeded, the comparison being made at time intervals ut less than T, and T is a multiple that differs from so that, for the sake of simplicity, the value of the load on the electrical network is measured at each interval At. 2. A device for registering the maximum electrical load, containing a memory unit, a control unit and an indicator, the input of which connected to the output of the memory unit, so that in order to increase accuracy, a load sensor, n integrators, a maximum load value selector and a clock pulse generator are introduced, and the load sensor output connected to the information inputs of the integrators, the output of the clock generator is connected to the input of the control unit, the outputs of which are connected to the control inputs of the integrators, the outputs of which are connected to the inputs selector of the maximum load value, the output of which is connected to the input of the memory unit, the output of which. also connected to the (n + 1) bypass of the maximum load selector.