SU985809A1 - Signal receiving/ transmission device - Google Patents

Description

(5) DEVICE FOR TRANSFER AND RECEIVING SIGNALS. The device relates to the information-measuring technique and can be used to measure the parameters of the vibration of the wires of overhead power lines -. A ground device is known for recording wire cords. Contains an induction sensor, on the output of which, when it is produced, a signal appears with a frequency characteristic of the mechanical frequency of the plate, and an analyzer that detects this frequency and signals the presence of a plate with ki -1 3. The disadvantages of this device are the inability to measure vibration parameters due to low sensitivity when wireing (the amount of wire displacement is several orders of magnitude higher than that of vibration), and also that this device can only detect the presence or absence of a cable without determining its amplitude. A device for protection against vibration of wires of small cross sections with sub-; holding clamps, which describes a method for measuring the parameters of vibration of wires, vibration sensor serves as a piezo accelerometer, mounted on the wire. The signal from the sensor goes through the cable to the ground, where it is amplified and then recorded with a loop oscilloscope. If it is necessary to obtain information about the amplitude of the vibration of the wires, the signal from the sensor is double integrated 2. The disadvantages of this method are the lack of remote transmission of information, the lack of operation on the active line, and the measurement accuracy due to the small size of the measured signal. The device for transmitting and receiving signals, containing a sensor at the transmitting point, the output of which through the first input of the signal amplifier is connected to the second input of the radio transmitter, the output of which is connected to the transmitting antenna, is connected to the transmitter through the synchronizer. to the second inputs of the signal amplifier and radio transmitter, on the receiving side containing a receiving antenna connected to the input of the radio receiver, the first output of which is connected through the synchronous signal to the first input of the signal recorder, to the second input of which the output of the C 3 radio receiver is connected. The main disadvantages of the known device are the lack of calibration of the measuring path and the use as sensitive elements of strain gauges, since it is difficult for them to stick to the PTL cable and protection from the environment is necessary. When gluing the strain gauges, the grating may be deformed, as a result of which their calibration characteristics change, the measurement accuracy of the wire vibration parameters decreases, the reliability of the results and the installation of the device on the power transmission lines become complicated. In addition, to transmit information from several wires or several points of a single wire, it is necessary to rely on several devices, which leads to an increase in the probability of failure of one of the devices and loss of information. The purpose of the invention is to improve the noise immunity of signals and the reliability of the device. This goal is achieved by the fact that in a device for transmitting and receiving signals, which contains a signal sensor at the transmitting point, a signal amplifier, the output of which is connected to the first input of the radio signal transmitter, is a power supply unit connected to the synchronizer input of the signals the inputs of the signal amplifier and the second input of the radio signal transmitter, the output of which is connected to the transmitting antenna, at the receiving point containing the receiving antenna connected to the input of the radio receiver

The first output of which is connected to the first input of the signal recorder through the signal synchronizer.

Claims (3)

The sensor allows a signal to be received at the output of the device, proportional to the acceleration of oscillations 94 to the second input of which a second output of the radio receiver is connected; connected to the first inputs of the signal clock; connected to the second input of the signal switch; first inputs of the generator of calibration signals; distribution A pulse and a clock generator, the output of which is connected to the second input of the pulse distributor, whose outputs are respectively connected to the third inputs of the signal switch, and to the fourth input of which the output of the calibration signals generator is connected. FIG. 1 shows a block diagram of the proposed device; in fig. 2 is a schematic diagram of the transfer half set; in fig. 3 - time diagram of the device. The device contains a transmission point 1, a controlled point 2. A transmission point contains sensors 3 signals, a generator of k calibrated signals, a generator of 5 clock pulses, a distributor of 6 pulses, a switch 7 signals, an amplifier 8 signals, a radio transmitter 9 signals, a power supply unit 10, a synchronizer 11 signals . The receiving point contains a radio receiver 12 signals, the recorder 13 signals, the synchronizer H signals. Vibration sensors are piezoelectric accelerometers, the output emf of which is proportional to vibration acceleration e Sx, where S is the sensor sensitivity, x is the wire displacement. The use of accelerometers as sensors makes it possible to increase the accuracy of measurements, since, compared with the strain gauges used in the prototype, the parameters of accelerometers are much less dependent on environmental conditions, and when mounted, the accelerometer is not subjected to deformation. The piezoelectric conductor (in this case, the measuring amplifier 8 performs only the amplification of the sensor signal), and the amplitude of oscillations in this case, the measuring amplifier 8 performs double integration of the signal). A calibrated signal generator generates rectangular pulses of a fixed amplitude and frequency. Improving the noise immunity of a signal occurs due to an increase in the accuracy of measurements when introducing a calibrated signal source. The signals from the sensors and the calibrated signal, passing through the same information transmission path, are affected by the same factors causing errors. So, the errors introduced by the amplifier 8, the radio transmitter 9 by the radio receiver 12 due to the dependence of the gain factor of the amplifier, the frequency deviation of the frequency modulator of the radio transmitter, and the transmission coefficient of the radio receiver from. The temperatures and voltages of the supply voltage are the same for both signals. Consequently, when measuring an information signal relative to a calibrated signal, these errors disappear. The necessity of introducing the Calibrated signal is caused by the severe operating conditions of the device, since the temperature range is from -AO to + 50 ° C. A 5-clock pulse generator produces 1-second square-wave pulses. These I1-) pulses are fed to the input of the distributor 6 and their pulses, on the five outputs of which alternately appear signals, in the presence of which alternately connect the generator C of the calibrated signal and sensors 3 via switch 7 to the input of amplifier 6. The amplifier 8 is designed to amplification of signals when measuring accelerations of vibration of wires or amplification and double integration of signals when measuring the amplitude of vibration of wires. The radio transmitter 9 performs frequency modulation of the carrier signal. scrap coming from amplifier 8, amplification of the high-frequency signal and its emission into the air. Synchronizer 11 determines the cyclical operation of the entire device. 9 6 Periodically, the synchronizer connects power supplied from power supply unit 10 to generator U of a calibrated signal, generator 5 clock pulses, distributor 6 pulses, switch T, amplifier 8 and radio transmitter 9. Radio receiver 12 performs reception, detection and amplification of a useful signal. The registrar 13 records. the measured signal from the radio receiver 12. A recorder, a magnetograph, a loop oscilloscope, etc. can be used as a recorder. Visual observation of the signal on the oscilloscope screen can also be performed. If there is a signal on the air sync | koniser} k turns on the recorder 13 and the measured parameter is recorded. In the absence of a signal in the air, the recorder 13 by means of the synchronizer is turned off and recording stops. Improving the reliability of the device when measuring the vibration parameters of several wires or a single wire at several points was achieved by introducing a clock generator, a pulse distributor, a switch and using one amplifier, a radio transmitter, a power supply unit, a synchronizer. The introduction of three new units with the exclusion of four of each of the four on the transmitting side and the use on the receiving side of one SNjecTO four half-set increases the reliability of the device as a whole. The device for transmitting and receiving signals has a block structure. This design provides reliable electromagnetic shielding of individual components of the device from mutual pickups. The blocks are connected using connectors and placed in the case. To provide a magnetostatic shielding device, the housing is made of a ferromagnetic material. Outside the housing is covered with a metal with high electrical conductivity, which improves the electromagnetic shielding and contributes to an increase in the efficiency of the antenna. The device operates as follows (Fig. 2, Synchronizer 11 energizes all units of the transmitting side 1. The clock pulse generator generates the first pulse that, having passed through the valve 6, appears at the switch input. The corresponding key closes switch 7 and the voltage from the calibrated signal generator goes to the input of amplifier 8, amplifies and passes to the radio transmitter, where frequency modulation of the carrier, amplification of the high-frequency signal and its emission take place on the air. The signal on the air appears at both outputs of the radio receiver 12. In this case, the synchronizer 14 switches on the recorder 13 and records the detected and amplified signal from the radio receiver. Then the generator C of the clock pulses produces a second pulse. the signal at the second input of the switch 7, the first sensor 8 is connected to the amplifier, then amplification, modulation, broadcasting, demodulation and recording of the signal. Next, the remaining sensors are connected in turn and the device works in a similar way. Then the synchronizer 11 turns off the power from the remaining blocks of the transmitting side 1, there is a pause in operation, which is used to charge the batteries of the power supply unit 10. In this case, the signal on the air disappears, the synchronizer T switches off the recorder 13 from the network and the recording of information stops. After a pause, for 15 minutes, the synchronizer reconnects to power and the device's cycle is repeated. The proposed device has a higher accuracy due to the calibration of the measuring path during operation and has a higher reliability when measuring vibration parameters at several points due to alternate scanning of four sensors and measuring their parameters with one device. An apparatus for transmitting and receiving signals, comprising, at a transmitter point, a signal sensor, a signal amplifier, the output of which is connected to the first input of a radio signal transmitter, a power supply unit connected to the input of the signal synchronizer, the output of which is connected to the first inputs of the signal amplifier, and the second input of the radio signal transmitter, the output of which is connected to the transmitting antenna, at the receiving point containing a receiving antenna connected to the input of the radio receiver of signals, the first output of which is via si The signal clock is connected to the first input of the signal recorder, to the second input of which the second output of the radio signal receiver is connected, characterized in that, in order to increase the noise immunity of signal transmission and device reliability, a clock pulse generator, a pulse distributor, a signal switch are entered at the transmitting point and a signal sensor, made on piezoelectric accelerometers, the outputs of which are respectively connected to the first inputs of the signal switch, the output of the signal synchronizer It is connected to the second input of the signal switch, the first inputs of the calibration signal generator, the pulse distributor and the clock pulse generator, the output of which is connected to the second input of the pulse distributor, whose outputs are respectively connected to the third inputs of the signal switch, to the fourth input of which the calibration signal generator output is connected. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 556528, .cl. H 02 C7 / 1t, 1977. 2 .. Savvaitov DS Protection against vibration of small wire sections with supporting clamps. - Electric stations, 1972, No. 8. 3. Bukner V., Kerner G., PhillipsV. (FRG) Mechanical stresses in the wires of power lines near the supporting clamp. - Overhead power lines. Translations of reports. International Conference on Large Electric Systems CIGRE, 1968. Ed. V.V. Burgsdorf .. M., Energie, 1970, p. 162 (prototype). Riga.1 Vni / maMt / ff V ee / feffomopa / P :  i // jflh jfe / i / ff // / 7e / aff // / code ffff / f / i mamffjya Vt / nM jfew u // 77ffffff hffffe / r0 / f // y / 77aa7o a. Ify / y aSjfeffi / Mim / e / 7 de / f / Xff ff / tff / f / 7 G / 77o / & / 7 / ra e // / fav f / / 7ff / vff; f0fff / fff / fff / afffff / fo. Iw  // a ff; (ff (7e / fffff / ry / amajya B tef / e amff / a ./fa/ i / / yff a //// eff. V /