SU830480A1 - Device for remote indication through power distributing networks - Google Patents

Description

(54) DEVICE OF TELESIGNALIZATION BY POWER DISTRIBUTIVE. NETWORK

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The invention relates to telemechanics and can be used in remote signaling systems installed in power distribution networks for signaling the operation of sensors (ice, position of switching devices, etc.).

A device for remote signaling of icing is known, containing a current-limiting element and a coding unit, kinematically connected to the sensor and made in the form of an overrunning clutch, on the disk of which the movable contacts are spaced and on the case are fixed contacts connected in series between the wire of the controlled line and the current-limiting element one.

The device has complex kinematics and is unreliable in operation.

The closest in technical essence is a device for remote signaling of ice on wires of power lines, containing a vacuum arcing chamber with moving and fixed contact, connected respectively to the first output of the current limiting element and to the phase conductor of the power distribution network, the coding unit, the closing unit contact of the controlled object and power source 2.

The disadvantage of the device is its low noise immunity.

Short-term natural closures in the network through transient resistances to earth, for example, when short-term tree branches touch the network wire, causes a false alarm of the receiving signaling device, and the coincidence of such short circuits with signal transmission causes its operation to fail.

The purpose of the invention is to increase the noise immunity of the device.

The goal is achieved by inserting a key, resisted by a resistor and connected between the second output of the current-limiting element and the ground, an electromagnet connected kinematically with the moving contact of the vacuum arc chamber, the coding unit contains a time relay, an intermediate relay and a control relay, the first outputs of which are connected to the first pole of the power source, the second terminals of the electromagnet and the time relay are connected to each other and are connected via the make contact of the control relay The second output of the control relay through the disconnecting contact of the intermediate relay and the second output of the intermediate relay through the parallel connected closing contact of the intermediate relay and the closing with deceleration when triggered The contact of the time relay is connected to each other and connected to the second pole power source.

The drawing shows a block diagram of the proposed device.

The device contains a power source 1, a coding unit 2, an electromagnet 3, a controlled object 4, a connecting element 5 in the form of a vacuum arcing chamber, a moving contact 6, a fixed contact. 7 cameras, a key 8, a resistor 9, a current limiting element 10, a phase wire 11, the coding unit contains a control relay 12, a control relay 13 contact, an intermediate relay 14, an intermediate relay closing contact 15, an intermediate relay closing terminal 16, a time relay 17, closing with deceleration when triggered contact 18 time relay, closing the block-contact 19 of the controlled object.

The device works as follows.

When the position of the monitored object 4 changes, its block contact 19 closes, connects coding unit 2 to power supply 1, the control relay 12 receives power and makes 13 contact 13 connects time relay coil 17 and electromagnet 3 to power supply 1, contact 18, the time relay with deceleration closes and energizes the coil of the intermediate relay 14, which makes the closing contact 16 self-holding, and the disconnecting contact 15 disconnects the coil of the time relay 17 and the electromagnet 3 from the power supply 1. After the auxiliary contact 19 of the monitored object 4 is opened, the coil of the intermediate relay 14 is de-energized and the circuit returns to the initial state.

Thus, when the controlled object 4 changes position and closes its block contact 19 by a command from coding block 2, a short-term, strictly fixed duration tj of the phase wire 11 through a series-connected current limiting element 10 and a key 8, shunted by a resistor 9, to the ground occurs. The key 8 is shunted by a resistor 9 to limit the voltage across it to the non-conductive part of the period. Ground fault current, leakage

via switch 8, causes the appearance of even harmonics of current and voltage of zero sequence in the network, used as a signal.

Timing diagram explains principle

signal coding. The coding is carried out by strictly fixing the duration of 1, the pulse, and the presence of even harmonics in the coded signal makes it possible to distinguish it from all possible accidental short circuits in the network through the transient resistance to ground.

The attenuation of signals when using the proposed remote signaling device is determined mainly by the total network capacity and does not depend on its location. This makes the proposed device suitable for operation in a network of any configuration, which is especially important for rural distribution networks that differ in their branching and heterogeneity.

The use of the proposed device for remote signaling of the position of objects installed in the distribution network improves the noise immunity of transmitted signals and thereby reduces the damage caused by false alarms of the signal device.

Claims (2)

1. USSR author's certificate number 448533, cl. G 08 B 19/02. 2. USSR author's certificate number 638997, cl. G 08 B 19/02, 1979.