SU920776A1 - Device for determining load voltage characteristic slope - Google Patents

Description

(5) DEVICE FOR DETERMINING THE COEFFICIENTS OF THE TIGHTNESS OF THE LOAD VOLTAGE CHARACTERISTICS

I

The excerpt relates to computing, is intended to automate the measurement of mode parameters in electrical systems, and can be used for control purposes and for calculating the mode of power systems.

A device for automatically measuring the coordination ratio of two random processes is known, comprising input devices, a comparison circuit, an averaging device, a quadratic converter, a pulse generator, a time selector, a frequency divider, a counting pulse generator, a control trigger, a quadrant, an electronic switch, a modulator , pulse counter tl.

The principal difference in the definition of the slope coefficients compared with the correlation ratio is that in the first case the ratio of the conditional standard deviation of the random

function to the unconditional standard deviation of the argument; in the second case, the ratio of the conditional standard deviation of the random function to the unconditional standard deviation of the same function is determined.

The closest technical solution to the proposed is a device for measuring the coefficient

10 variability of a random process, containing an input device, a centering filter, a full-wave rectifier, voltage converters - time interval, generator

15 polling pulses, time selectors, a counting pulse generator, a control trigger, a frequency divider, a pulse counter.

However, this device allows

20 to obtain a characteristic of only one random process, in addition, this device has a low measurement accuracy.

The purpose of the invention is to improve the accuracy of measuring the coefficients of the steepness of the characteristics of the load of an electrical network node for voltage, which allows, without interfering with the normal operation of electrical consumers, to obtain these characteristics at the rate of information flow.

This goal is achieved by the fact that in the device containing the first centering filter, the first input of which is the first information input of the device, the output of the first centering filter is connected to the input of the first rectifier, the output of which is connected to the first input of the first analog-digital converter which is connected to the output of the polling pulse generator, the output of the first analog-to-digital converter is connected to the first input of the first element And, the second input

the second element, two keys, an indication unit, a second analog-to-digital converter, a second rectifier, a second centering filter, a voltage divider, and active and reactive power converters are inputted to the output of the clock generator, trigger, counter, and frequency divider. The inputs of which are combined and connected to the input of the voltage divider and are the second information input of the device, the output of the first key is connected to the second input of the first centering filter, the outputs of the converters are active and reactive power is connected respectively to the first and second inputs of the first key, the control input of which is the first control input of the device, the third information input of which is connected to the first input of the second centering filter, the output of which is connected to the first input of the second digital-analog converter, the second input of which connected to the information input of the second key and connected to the output of the polling pulse generator, the output of the second analog-to-digital converter connected to the first input of the watt The first element And, the second input of which is connected to the output of the clock pulse generator, the output of the second element And is connected to the input of a frequency divider, the output of which is connected to the first setting. the trigger input, the second installation input of which is connected to the output of the second switch, the control input of which is the second control input of the device, the output of the trigger is connected to the third inputs of the second and first elements And, the output of the first element And is connected to the input of the counter, the output of which is connected to the input of the display unit, the output of the voltage divider is connected to the second input of the second centering filter.

The drawing shows a diagram of the proposed device.

The device contains a voltage divider 1, a second centering filter 2, a second rectifier 3, a second analog-to-digital converter, a second element AND 5, a clock pulse generator 6, a trigger 7, a frequency divider 8, a polling pulse generator 9. active converters 10 and reactive M of power, the first centering filter 12, the first rectifier 13, the first analog-to-digital converter 1, the first element I 1, the counter 16, the display unit 17, the keys 18 and J9.

 The device works as follows.

In the case of a short-time supply of the signal to the control input of the second key, a logical unit is set at the output of the trigger 7. From this moment on, the enabling signal appears at the inputs of the And 5 and 15 elements. The control inputs of both analog-to-digital converters and D continuously receive polling pulses from the polling pulse generator 9.

Claims (2)

From the outputs of analog-digital converters and HNA, the first inputs of And 5 and 15 elements receive rectangular pulses, the duration of which is proportional to the input voltages of blocks C and I. The second inputs of both And 5 and 15 elements continuously receive clock pulses from the clock generator 6 8. The main measuring channel is supplied with a constant voltage through a switch 18 with an output of active converters 10 or reactive power 11 to the first input of a centering filter 12, to a second input of which a constant voltage is applied, proportional to the value of the conditional expectation M (P / i) or M (Q / U). The latter are calculated in advance for a given voltage of the load node of the electrical network. This direction in the device is adjustable, but remains constant in each measurement cycle. The bipolar output voltage of the centering filter 12 is converted to unipolar. In a full-wave rectifier 13. The output voltage of the rectifier 13 is proportional to the standard deviation bf and or dg / and depending on the presence or absence of a control signal on the control input key 18. The specified voltage is supplied to the measuring input of the main analog-to-digital converter N. The input of the additional channel is supplied with the voltage of the electrical network, where the tests are checked. Moreover, this input and the inputs of converters 10 and 11 are supplied with voltage from the same node of the electrical network. In divider 1, the voltage under test is brought to the required value and in the centering filter 2 is compared with the reference voltage, which is proportional to the voltage of the normal mode of the network. The bipolar voltage from the output of the centering filter 2 is transformed into a unipolar bipolar rectifier 3. This voltage is proportional to the standard deviation of the normal network voltage U. The output voltage from the output of block 3 is fed to the measuring input of an additional analog-to-digital converter, where it is converted into a time interval. While trigger 7 is in the single state, the pulses from the clock pulse generator 6 are transmitted to the pulse counter 16 and to the frequency divider 8 in the clock. The latter has a certain conversion factor equal to С, Г1 which can be changed. After the arrival, 0 g laziness in the frequency divider 18 C pulses at its output, a pulse is formed, which translates trigger 7 into the zero state 1e. In doing so, at the third inputs of the time selectors 5 and 15, a logical zero appears, which further leaves their output state unchanged. The number of pulses registered in the frequency divider 18, is equal to C ft, - h. k, - 6g-n, (1) where (i, h and the transfer coefficients of the centering filter 2, rectifier 3 and additional analog-digital converter C, respectively, n is the number of pulses from the clock generator 6, received at the second input of the additional time the selector 5. After the trigger 7 is set to the zero state, i.e., after the end of the measurement cycle, N pulses are recorded in the pulse counter 16. (2.- HQ ,. H th (j and k fj are the transmission coefficients, respectively, of the centering filter 12, Rectifier 13 and the main analog-digital converter Applicant l, respectively. Expression of the number of pulses n from formula (1) and substituting it into formula (2) will give tl t "and For obtaining a direct reference, set the conversion factor of frequency divider 8, 5.- and where q is an integer selected In order to provide the required number of polls, it is advisable to use the same blocks in the device: centering filters 2 and 12, rectifiers 3 and 13, and analog-to-digital converters k and 1. Then the conversion factor of frequency divider 8 will be equal to С sio and will be connected in series adnyh counters. In this case, the indications of the display unit 17i connected to the counter i7 of the pulses 16 represent directly the actual reading of the values of the coefficients of the steepness of the characteristics P f (U) or Q f (U) obtained for a given voltage of the normal voltage - the number q is determined by the position in comma. Thus, automating the process of measuring the steepness coefficients of the load characteristics by voltage allows one to increase the accuracy of their measurement without interfering with the normal operation of electrical consumers and significantly save labor and material resources associated with obtaining and processing initial information. Apparatus of the Invention A device for determining the steepness coefficients of load characteristics by voltage, comprising a trigger, a counter, a frequency divider, a first centering filter, the first input of which is the first information input of the device, the output of the first centering filter is connected to the input of the first rectifier, the output of which connected to the first input of the first analog-to-digital converter,. The second input of which is connected to the output of the polling pulse generator, the output of the first analog-digital converter is connected to the first input of the first And element, the second input of which is connected to the output of the clock generator, characterized in that, in order to improve the determination accuracy, a second And element, two keys, display unit second analog-to-digital converter, second rectifier, second centering filter, voltage divider and active and reactive power converters, whose inputs are combined They are connected to the input of the voltage divider and are the second information input of the device, the output of the first switch is connected to the second input of the first centering filter, the outputs of the active and reactive power converters are connected respectively to the first and second inputs of the first switch, the control input of which is the first the control input of the device, the third information input of which is connected to the first input of the second centering filter, the output of which is connected to the first input of the second digital-analogue output The emitter, the second input of which is connected to the information input of the second switch and connected to the output of the polling pulse generator, the output of the second analog-digital converter is connected to the first input of the second element And, the second input of which is connected to the output of the clock generator, output of the second element And connected with the input of a frequency divider, the output of which is connected to the first, setup, trigger input, the second setup input of which is connected to the output of the second key, the control input of which is the second channeling yuschim input device, a trigger output connected to a third input of the second and first AND gates, yihod first AND input is connected to a counter whose output is connected to the input of the indication unit, the output voltage divider is connected to the second input of the second centering filter. Sources of information taken into account in the examination 1, USSR Author's Certificate No., cl. G 01 N 27/62, 1968. 2. Authors certificate of the USSR 06 G, 1970 No. 263297, cl. G (prototype). with ъ rr "CS v " 01 "Uh