SU1488844A2 - Device for monitoring power supply consumption - Google Patents

Description

The invention relates to automation and computing and can be used in energy management systems, it allows you to accurately determine at any time the value of the current load of the consumer and record the moment of excess of the power consumption of energy above the specified limit values ,, The purpose of the invention is to increase

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completeness of control "The device contains a block 1 for determining periods, a block 9 for receiving information, sensors 10 for power consumption, a shaper 11, a reverse value of a number in a direct code, a shaper 12, a reverse value of a number in an additional code, an adder 13, a multiplication block 14, a block 15

memory of settings, accumulating adder 16, conversion code 17 analogue block, control block 18, overload control block 40, containing comparison circuit 41, decoder 42 and flip-flops 43 ₄ -43 _ν “The device allows for operational protection against emergency overloads” 2 Il.

The invention relates to computing, can be used to control the dynamics of energy consumption, in particular electricity and is an improvement of the invention according to the author ”No. 1310844 · 2θ

The purpose of the invention is to increase the completeness of the control "

FIG. 1 shows a block diagram of the device; Fig 2 - diagram of the device. '25

The diagram (Fig. 1) denotes the period definition block 1, which includes the OR element 2, the counter 3, the OR element 4, the memory node 5, the memory node 6, the OR group of elements 7, the OR element 8, the information receiving block 9, the flow sensors 10 of electricity, shaper 11 reverse value of the number in the direct code, shaper 12 reverse value of the number in the additional code, adder 13, multiplication unit 14, setpoint memory unit 15, accumulator adder 16, code conversion unit 17 analogue, control unit 18, including And 19, trig dd ger 20 mode, generator 21 clock and pulses, elements 22 and 23, synchronization nodes 24 and 25, amplifiers 26, address counter 27, console 28, trigger 29, outputs 30-34 of node 24, outputs 35-39 of node 25, overload control unit 40, including comparison circuit 41 , decoder 42, triggers 43 ^ 43k, outputs 44 blocks 40 "

To improve the accuracy of monitoring the value of the current combined power, the power value is corrected by the arrival of each signal from the energy consumption sensor.

The power value (Р |) for each ΐ sensor is determined by dividing the weighting factor (L;) by the time (T;) for which this quantum of energy is generated

P- = b; / T ;.

The weight value is determined by the expression

K _1T 'K,' _n / a; ,

where K; _g , K; _m - transformation ratios of the corresponding current and voltage transformers;

but ; - constant electric meter expressing the number of pulses per I kW / cho

When determining the current combined power of the consumer, which is powered from several inputs and has sub-subscribers, only in the first period in the case of synchronous start of counters, the current power (P _tech ) is determined

; = 1 ’

where P; = +1 when input is feeding;

R; = -1 when the subscriber is connected;

N is the number of different input sub-subscribers.

In the general case, when determining the current combined power, it is necessary to constantly update the current value with the arrival of a new pulse, replacing the received power value on this input with the old one. ”To simplify this operation, you can operate with increments of reciprocal values of pulse repetition periods, which are proportional to the power value, those.

tech

R; (

where K is the current period value;

(K-1) - previous period value "

To perform the inspection function

limiting power modes

or power flows produced

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comparison of the obtained value of the current capacity of the controlled object (-) with the limit value, which

stored in block 15 of memory settings

In case the current power value exceeds the set one, then the decoder 42 is triggered and the trigger 43 corresponding to the sensor being processed is set to one state, giving a signal that the specified power consumption mode is exceeded.

The device works as follows "15

Before starting the device, the operator, based on the specific power supply scheme of the consumer, from the remote control 28 enters into the memory block 15 the settings of the weighting factors (L;) of the sensors 10 20

the sign with which the energy consumption should be taken into account when determining the total power consumed, as well as the limit values of current equivalents

", 1" 25

• capacities (—Y), which are calculated in advance for each sensor of the monitored object. The initial reset signal from the remote control 28 sets the initial zero state of the nodes 24 30 and 25, the address counter 27 and the trigger 29. With the single output from the trigger 29, the element 19 closes, through the element OR 2 the counter 3 is set to the zero state, through element 35 OR the node 6 memory is set to the recording mode, through the element OR 8 memory node 5 is set to the recording position, the adder 1b is also set to the zero state "Trig ~ 40 ger 20'can be in any state"

If it is accidentally set to .. a single state, the signals from generator 21 are fed through element I 22 to the input of node 24 “Outputs 30-33 45

Node 24 does not affect the operation of the device due to the predominant effect of the initial installation signals, and the arrival of the sync pulse 34 will trigger 20 into the zero state. ”From now on or in case of accidental installation of the trigger 20 by the“ Reset ”signals from the console 28 signals from the generator 21 through the element. And 23 arrive at the input of the node 25. At the same time, the amplifiers 26 are opened, and the input of the block 9 from the single output of the trigger 20 receives the signal to prohibit the output of the address, so that the address input of the nodes 6 and 5 is received through amplifiers 26 and group 7 u OR outputs of the digits of the counter 27. Outputs 35-38 of node 25 due to the predominant effect of the installation outputs of the trigger 29 do not affect the operation of the device, only 39 will add in each cycle to the counter 27 addresses by one, i.e. cells of nodes 5 and 6 of the memory and writing zeros in them "When the counter 27 addresses overflow, the overflow signal sets trigger 29 to one and the device is ready for operation"

The sync pulse from output 35 of node 27 analyzes the presence of a signal of the information tag from information receiving block 9 ”If there is no information sign, then the sync pulse from output 36 records the contents of memory node 6 into counter 3.

On sync pulse from output 37, “I” is added to counter 3 and on sync pulse from output 38, the new contents of counter 3 are written to node 6 ”But the sync pulse from output 39 is one in address counter 27” This process will be repeated cyclically while receiving from block 9 information will not receive a signal sign information. In this case, the sync pulse from output 35 triggers 20 will be set to one state. The zero output of trigger 20 closes AND 23 and amplifiers 26, and a single output opens AND 22 and simultaneously gives permission to issue the address of the polled sensor from block 9 "

Thus, the contents of the cells of nodes 5 and 6, corresponding to the address of the sensor being polled, will go to the inputs of the formers 11 and 12 "The former 11 converts the time value of the current period (T,) in binary code to the reciprocal (1 / T ^)" Former 12

I

converts the time value of the previous period · (T * ^'1) in the reciprocal (T ^x' ') in the additional binary "size inverse value of the current power (T ^x) ι-th processed sensor is supplied to first inputs 4I comparison circuit, the second inputs of which receive a valid value from block 7 1488

ka 15 of settings memory ”If the value of the reciprocal value is more than acceptable, then by gate 30 to the decoder 42, whose address inputs are connected to the address outputs of the control unit 18, a signal is issued and the trigger 42 corresponding to the sensor being processed is set to one state By issuing the signal 44 o the maximum permissible value, the operator from the remote control 28 of the control unit 18 can “redeem” this signal by setting this trigger 43 to the zero state ”15

The adder 13 produces an arithmetic addition of two values and outputs the result to multiplication unit 14; simultaneously, the 20 weighting factor of the sensor being polled goes to the other inputs of multiplication unit 14, along with a sign that determines the type of consumer controlled by this sensor (sub-subscriber, own consumption, own 25 output) etc")"

On the sync pulse from output 30, block 14 produces, multiplying and outputting the result to the input of the adder 16, which, using a clock pulse from output 31, receives the result with its sign. ”At the same time, the counter 3 is reset.

The sync pulse from output 32 overwrites the contents of node ^ 5 of the 6 memory of the selected sensor into the memory node 5.

The sync pulse from output 33 is used to write the contents of counter 3 to memory node 6 ”40

According to the clock pulse from output 34, the trigger 20 is set to the zero state and the countdown of the current period starts again. ”

From the diagram (Fig "2) it can be seen that 45

Poll appearance of a sign of information

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goes almost all the time "The processing time of the receipt of a sign, information should be less than one, divided by the number of sensors multiplied by the frequency of appearance of information signals that at speed, for example, K155 series microcircuits realizable"

The positive effect of the proposed device depends on the hardware implementation. ”In particular, this device will allow, along with monitoring the current combined power consumption, to produce operational protection against overloads in emergency situations, thereby eliminating in some cases current protection relays, overloading or duplicating their functions. thus the reliability of the power supply

Claims (1)

Claim A device for monitoring power consumption according to author "sv No. 1310844, characterized in that, in order to increase the completeness of control, an additional overload control unit was added containing a decoder, triggers and a comparison circuit, with information inputs connected to the outputs of the reverse code number generator in the direct code and the setpoint memory, the gate input to the gate input of the device, and the output to the control input of the decoder, the information inputs connected to the outputs of the respective amplifiers, and outputs - with the installation inputs of the corresponding triggers, the outputs of which are the corresponding signal outputs of the device, and the reset inputs are connected to the corresponding outputs of the installation of the control unit control panel. 1488844