SU393702A1 - THE INDICATOR OF HOLIDAY FORMATION ON AIRLINE ELECTRICAL TRANSMISSION - Google Patents

Description

one

The invention relates to devices for transmitting electrical energy on aerial lines can be used to detect icing on the wires.

Indicators of icing on overhead power lines are known, containing sensors, frequency generators, additional communication wire, receivers. However, known devices are complex and unreliable in operation.

The purpose of the invention is to simplify the device and increase its reliability.

The indicator proposed is different in that a comparison unit, a frequency receiver, a threshold element, a time delay block, an ice melting switch-on unit, and the inputs of the TIIA LC sensor are connected to two wires of the air line in the most intensively formed section. The operation of the device is based on the principle of transferring information through a loop between two phases through an icing load sensor, the parameters of which are different depending on the change in icing load.

The drawing is a block diagram of the device.

The indicator consists of a high-frequency generator /, an input unit 2 with a capacitor overload 3, an information receiving unit 4 with a communication capacitor 5, a comparison unit 6, a frequency receiver 7, a multi-position cell 8, a time delay unit I, a local alarm unit 10, block 11 Circuit parameters for ice melting, ice loading sensor 12 with coupling capacitor 13.

For more reliable operation of the device, the frequency of the RF heliorator is selected within 700–1000 Hz, since the most favorable conditions for transmitting information through the loop (RF generator, one of the line phases, the sensor installed in the zone of the most intensive ice formation, and according to the dr phase, to the input of the frequency receiver) are observed at frequencies not higher than 1000 Hz. At frequencies above the frequency limit, the interfacial dispersed parameters, in particular, Xc, sharply decrease, which causes an increased transfer of the frequency to the other phase past the sensor on the line.

In the absence of ice, the ferromagnetic core of the ice sensor embedded in plastic is completely inside the inductance. B. This is achieved due to the fact that the force of the special spring, which binds the core to the tension in, compensates for the weight of the two half-spans of the M-line wires.

In this case, the parameters of the contour () correspond to the greatest cooling signal with a frequency of 1000 Hz through the sensor in

neighboring phase to which the frequency receiver is connected through the input unit 2. From the output of the frequency receiver, the maximum signal level goes to one of the inputs of the comparison unit. If there are two proportional values at the inputs, the comparison unit issues a ban to the local signaling unit and to turn on the ice melting scheme. At the same time, the ban on execution comes from the threshold element, since the maximum level of the high-sipnal at its input corresponds to a zero setting.

In this case, the local signaling unit and the ice melting circuit activation unit do not issue a signal and commands to activate the ice melting.

When the ice appears, the suspension becomes more desirable, and the core connected to the suspension wire through the insulator and the core, reduces, inductance, thereby limiting the value of the control signal through the sensor to the neighboring phase. This causes a decrease in the signal at the inputs of the frequency receiver and the comparison unit connected to the adjacent phase through the input unit.

Reducing the incoming level at one of the inputs of the comparator unit triggers a null organ, which in turn removes the prohibition from the local signaling unit and the ice melting circuit activation unit. When the signal decreases to a certain value, the first step of the threshold device starts .

If the appropriate level is held, I1a, without interruption, for a given time, the time element gives the dispatcher permission to send a signal through the local alarm device and the remote signaling device.

With increasing ice load, the sensor core, moving inside the coil, decreases the inductance L and, accordingly, this contributes to an increase in z. As Z increases, the receiver's signal weakens. B, the output of the core: ka from .kusch1KI (A1, Sl: s for the sent frequency of 1000 Hz, the level at the input of the frequency receiver is reduced to the value corresponding to the last threshold setting. In this case, the signal pa.sarabatyvanie from the threshold element and the time element is not available block input circuit melting ice.

At the same time, the signal passes to the local signaling unit, which records the moment of the start of ice melting.

The device has an element of time applied that prevents the operation of the sigpalizadia block during short-term line loads (wind loads).

The time delay of the signal is adjusted smoothly, as necessary from a few seconds to a minute. In addition, a comparator block was used in the device, which allows controlling the operation of the high-frequency generator and the device as a whole. The proposed device determines the occurrence of an icy load from its inception to the moment of melting due to the use of a multistage threshold element. Introduction to the device of the above elements prevents false alarms and increases its reliability.

Subject invention

Claims (2)

1. The indicator of airborne transmission lines, containing a high-frequency generator, one of the outputs of which is connected to the input of the data transmission input unit, and its output through a communication capacitor connected to one of the wires of the air transmission line, a local alarm unit and an ice sensor in the form of an LC circuit connected to the wires of an overhead transmission line, a unit for receiving information, the input of which is connected via a capacitor to another wire of the air transmission line, exc Compared with the fact that, in order to increase the reliability and simplify the device, a comparison block, a frequency receiver, a threshold element, a time delay block and an ice melting circuit were inserted into it, one of the (INPUTS of which, through a comparison block with another output of the high-frequency generator) and one of the inputs of the local signaling unit, the other input of which is connected to one of the outputs of the power block, the other output of which is connected to the second input of the switching unit of the ice melting circuit, the third input of which is connected to the output of the threshold element and with the input of the time-keeping block 1, the input of the threshold element is connected to one of the outputs of the frequency receiver, the other output and the input of which are connected respectively to the first input of the comparator and the output of the input information block, and the second input of the comparator is connected to another output of the high-frequency generator. 2. The indicator under item 1, characterized in that the inputs of the ice load sensor are connected via a capacitor between two wires of an overhead transmission line, and its core is through a cable and the insulator is mechanically connected to one of the wires of the same line. / 4/7 3 r / j "Si 72