SU1709449A2 - Device for inspection of glazed ice load on wires or earth- wires of power line - Google Patents

Description

The invention relates to electrical engineering, in particular, to devices for signaling an icy hazardous situation on overhead transmission lines (OHL).

A device is known for controlling the icing load on an overhead line, and which information is transmitted in a circuit containing an insulated cable or overhead line wire. To the wire or cable in the place of receiving information is connected to one output choke, the other output of which is connected to ground through the first capacitor, which is shunted by the receiving unit. In the place of information transfer to the cable Or the wire VL is connected to one output of the primary winding of the transformer, the other output of which is connected to ground via a second capacitor. To the secondary winding of the transformer is connected an input of the ice detector, made with an ice load sensor and a converter of its signal into a proportional DC voltage, and the output of the ice detector is connected to the second capacitor.

The drawback of the device is that it cannot be used on overhead lines in networks with a grounded neutral due to the shunting effect of the high-voltage windings of power transformers connected in a star circuit with a grounded neutral. As a result, the field of application of the device is significantly narrowed.

The purpose of the invention is to expand the scope.

The goal is achieved by adding third and fourth capacitors to the device for controlling ice load on wires or overhead lines, which have terminals for connecting lines between busbars and the corresponding terminals of leads / throttle and voltage transformer to the phase wire. These capacitors prevent the shunting of direct current, which reflects the level of ice load, grounded high voltage windings of power transformers, connecting 1X star circuit with a grounded neutral. As a result, the device can be used to control the ice load on the VL phase wires in networks with grounded neutral, due to which its area of application is greatly expanded.

The drawing shows a diagram of the device.

The device contains a phase wire 1 VL. on which they control the icy

load; choke 2, first capacitor 3, receiving unit 4, voltage transformer 5, second condenser 6. ice signaling device 7, busbars 8 and 9, third and fourth capacitors 10 and 11. power transformers 12 and 13.

In the device, one phase wire 2 is connected at the receiving end to the phase conductor 1 VL, on which the icing load is controlled. The other output of the throttle through the first capacitor 3, which is shunted by the receiving unit 4, is connected to ground.

At the transmitting end, the primary winding of the transformer 5 is connected to the phase conductor 1 VL by one output. The other end of this winding is connected to ground via a second capacitor b. The ice detector 7 is connected to the secondary winding of the transformer 5, equipped with an ice load sensor and a converter of the output signal of the ice load sensor into a proportional DC voltage. The output of block 7 is connected to the second capacitor 6.

The third and fourth capacitors 10 and 11 are connected to the dissection of the phase wire 1 between the points of connection of the chokes 2, transformer 5 and busbars 8 and 9. Power transformers (autotransformers) 12 and 13 are connected to the busbars 8 and 9, having a high voltage winding connection star with grounded neutral. ,

When the device operates, the DC voltage, the value of which is proportional to the icing load, charges the capacitor 3, to which the receiving unit 4 is connected. At the same time, the capacitors 10 and 11 prevent the spreading of the DC signal of the icing load across the H (transformer (auto transformer) ) 12 and 13 and associated with them autotransformer links of the elements of the electrical network. Thus, the capacitors 10 and 11 exclude a shunt action of elements connected to the buses 8 and 9, and having electrical connection to the miley.

Claims (1)

Capacitors 10 and 11 are assembled from separate capacitor banks, for example, type KC2-1.05-75-2U. The following conditions must be observed: the resulting capacitance of the capacitors must lie within the range of inductive resistances of the individual phases of the non-transposed VL, i.e. do not exceed 2-4% of the value of inductive resistance of the phase of overhead lines; the fall of the voltage 517094 on the capacitors under load must lie within the nominal limits; The isolation of capacitor blocks 10 and 1 f from the ground must correspond to the phase voltage level of an overhead transmission line, and the capacitors 5 themselves must be marked with spark gaps. The technical and economic efficiency is determined by the expansion of the application of the device. At the same time, a rather simple solution of the technical problem of controlling icy loads on the phase conductors of overhead lines in networks with a grounded 9b neutral is ensured and an increase in the total economic effect is achieved. The invention of the Device for controlling the ice load on the wires or cables of the transmission line according to the author. No. 1539885, so that, in order to expand the field of application, third and fourth capacitors are additionally inserted at the ends of the line, having terminals for connecting the line between the busbars and the corresponding terminals of the terminals of the throttle and voltage transformer.