SU1246387A1 - Device for checking conditions of electric network - Google Patents

Abstract

This invention relates to energy. Monitoring efficiency is enhanced by monitoring without being disconnected from the network, and the network load of consumers is determined. The device contains an executive point 1, consisting of a network state sensor (DSS) 2 and n receivers (P) 3, as well as p - repeated points 4, each consisting of a current transformer (TT) 5, a transmitter 6 and separation capacitor 7 The PZ is received from the frequency-modulated frequency transmitters 6 with frequency deviation, controlled by the CT 5. The transients from the mixture of frequencies present on the line transmit voltages in the frequency range corresponding to the signal of the transmitter 6 of this line. If the current in the line exceeds the allowable value, then a logic unit signal is generated at the PZ outputs. If the line is in the nominal mode, then a logic zero signal is generated at the PZ outputs. These signals are received: -on the corresponding inputs of BCS 2. In the presence of a signal of a logical unit, short circuits in the line and line break are recorded at one of the outputs of the P 3 in the DSS 2. The goal is achieved by the introduction of DSS 2, (p-1) PZ and capacitor 7. Examples of performance of DSS 2 and PZ are given. 2 3. p. F-ly, 3 ill. .

Description

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The invention relates to power engineering and can be used to monitor the state of power systems.

The purpose of the invention is to increase the efficiency of monitoring by monitoring without disconnecting the network and determining the load of the network by consumers. Figure 1 shows a structural electrical circuit diagram of the devices — and monitoring the state of the electrical network; on

- Fig. 2 is a structural electrical circuit of the receiver; in Fig. 3, a network state sensor.

The device contains, at the executive point 1, a sensor of the state of the network 2, 3 receivers 3 and 5 n-repeat points 4, each of which has a current transformer 5, a transmitter 6 and a coupling capacitor. 7. The receiver 3 contains a band-pass filter 8, frequency detector 9, amplitude detector 10, first 11, second 12 and third 13 threshold elements, first 14 and second 15 inver40

tori and element and 16, Network state sensor 2. It contains the first 17 and second 18 registers, the first 19 and second .20 indicators, the first 21 and second 22 pulse generators, n elements And, and n counters 24i-24n. thirty

The device works as follows

Consumers are connected to the outputs of the device. At the repeated points 4 from the transmitters of the signals B, the signals of the SPHIG.1 are received. To the executive point 1 "As transmitters 6, oscillating frequency generators are used which are tuned to the average frequency defined for each consumer. The frequency deviation of the transmitters 6 is controlled by current transformers 5. Consequently, each transmitter 6-6f, in turn, generates a frequency-modulated signal with a frequency deviation proportional to the magnitude of the current in the line. In execution point 1, the receivers 3, -3 from the mixture of frequencies present on the line, select the directions in the region frequencies corresponding to the signal of the transmitter 6 of this line. The signal is distributed using a band-pass filter 8 (FIG. 2). The selected signal is processed in two branches. The frequency detector 55 selects the voltage varying with the frequency of the operating current lines, and with amp lithudy proportional to 12463872

its amplitude. In the third threshold element 13, a comparison of the magnitudes of the amplitude of the voltage obtained with that established for each occurs.

5 lines of the permissible value of the pot-raking current. If the current in the line exceeds the permissible value, the signal of the logic 1 is generated at the first output of the receiver 3. The second branch produces the evaluation of the amplitude of the signal. In this case, a voltage proportional to the amplitude of the carrier is introduced in the amplitude detector 10, the value of which is compared in the first threshold element 11 with the value corresponding to the voltage at a line break. If the voltage at the output of the amplitude detector 10 is less than the threshold of the first threshold

20 of element 11, the signal passing through the first inverter 14 generates a logical 1 signal at the receiver 3 output. If the voltage at the output of the amplitude detector 10 is greater than the threshold of the first threshold element 11, but less than the threshold of the second threshold element 12, then the signal passage through the second in25

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The driver 15 and the element 16, forms at the second output of the receiver 3 a signal of logical 1, which corresponds to a short circuit on the line. If the line is in nominal mode, then at the first, second and third outputs of receiver 3, logical O signals are formed. Signals from the outputs of receivers 3, -3 are received at the corresponding inputs of the sensor of the state of network 2 (Fig. 1). As a result of the presence of a logical 1 signal at one of the outputs of receiver 3, the state of the first 17 or second 18 registers changes or the readings of the corresponding binary counters 24, -24 change, due to the fact that the signal from the first input opens And 23 (fig.Z). The state of the first 17 and the second. The 18 registers are displayed by the first 19 and second .20 indicators respectively. In this case, the first indicator 19 registers short circuits at LCSE.And, and the second indicator 20 indicates a line break. The speed of the device is determined by the frequency of pulses following the first 21 and second 22 pulse generators.

Claims (3)

1. A device for monitoring the state of the electrical network, comprising 0 five five The driver 15 and the element 16, forms at the second output of the receiver 3 a signal of logical 1, which corresponds to a short circuit on the line. If the line is in nominal mode, then at the first, second and third outputs of receiver 3, logical O signals are formed. Signals from the outputs of receivers 3, -3 are received at the corresponding inputs of the sensor of the state of network 2 (Fig. 1). As a result of the presence of a logical 1 signal at one of the outputs of receiver 3, the state of the first 17 or second 18 registers changes or the readings of the corresponding binary counters 24, -24 change, due to the fact that the signal from the first input opens one of the elements And 23 (fig.Z). The state of the first 17 and the second. The 18 registers are displayed by the first 19 and second .20 indicators respectively. In this case, the first indicator 19 registers short circuits at LCSE.And, and the second indicator 20 indicates a line break. The speed of the device is determined by the frequency of pulses following the first 21 and second 22 pulse generators. Formula and inventions 1. A device for monitoring the state of the electrical network, containing at the executive station a receiver, at each of the n-repeat points, a transmitter and a current transformer, the primary winding of which is connected to the control input of the transmitter, which is , in order to increase the monitoring efficiency by performing monitoring without disconnecting the network and determining the network load by consumers, the control station (p-1) of the receivers and the sensor of the network state are entered into it, with the first, second and third outputs of each receiverconnected to the corresponding first, second and third inputs of the network state sensor, the inputs of all receivers are combined and through the corresponding distribution institutes connected to the beginning of the secondary winding of current transformers of the corresponding repeat points, the current transformer windings are the corresponding outputs of the device at each repeated point A separation capacitor was introduced, one end of which is connected to the beginning of the secondary winding of the current transformer, and the other end to the output of the transmitter. 2. The device POP.1, characterized in that the receiver contains an element And, the first and second inverters, the first and second threshold elements and serially connected band-pass filter, a frequency detector and a third threshold element, V.1 3874 the output of which is the first output of the receiver, the second output of which is the output of the element I, the third output of which is the output of the first inverter, the input of the receiver is a band-pass filter whose output is through a series-connected amplitude detector, the second threshold element, the second inverter is connected to the first input element And, the second input of which is connected to the input of the first inverter, and through the first threshold element - to the output of the amplitude detector. 3. The device according to A.1, about tl and h 20 25 thirty 35 neither the network contains the first and second registers, the first and second indicators, the first and second pulse generator, the n elements of the I and n counters, the outputs of the first register are connected to the corresponding inputs of the first indicator, B | 1 the inputs of the second register are connected to the corresponding outputs of the second indicator, the output of the first generator The pulses are connected to the clock inputs of the first and second registers, the first inputs of the And elements are combined and are the first inputs of the network state sensor, the second inputs of the network are the inputs of the first register, the third inputs These are the inputs of the second register, the second pulse generator is connected to the second inputs of the AND elements, the outputs of which are connected to the corresponding counters, vsh.2 Vyh.ZO oh oh ow. / 4 5l. B} (. 3i BxJn Vlzp Fie. 5 Editor 0. Head Compiled by V.Kamal gin Tehred V.Kadar Proofreader M.MaksimishiIec: Order 4023/56 Circulation 624 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4