SU860195A2 - Device for determination of short circuit directionaon aerial line with branches - Google Patents

Description

(54) DEVICE FOR DETERMINING THE SHORT-TERMINATION DIRECTION AT THE AIRLINE WITH ANSWERS

,one - ;

The invention relates to devices for determining the direction of short circuit loisks in branched aerial electric networks 6-10, 35 kV.

According to the main auth. No. 756323, a device is known that contains two current sensors, the first of which is installed behind the branch point on the highway parallel to the branch wires, and the second on the branch line parallel to the wires of the overhead line. The current outputs of the current through the rectifiers and differentiating units are connected to the corresponding inputs of the response indicator, which can be executed in the form of a magnetic memory with an arrow having two stable states. The device indicates the direction of the last short-circuit, fixes both stable and unstable-short for 1 ”scan and fully meets the requirements of operation.

In those cases when, when searching for a place of a short distance, the crew moves along the highway

However, quite often when searching for a short circuit, a team arrives at the branching point along the shortest path. In this case, in order to obtain information, it is necessary to install two devices at the branching point.

The purpose of the invention is to provide

10 automatic reset of the device.

This goal is achieved by the fact that the device is additionally equipped with an antenna voltage converter, connected via a rectifier, integrating a block and a threshold element to the newly introduced third input of the response indicator.

In this case, the response indicator,

20, made in the form of a magnetic storage unit, provided with an W-magnetic core, the input windings are located on the outermost cores of the cotopes.

connected to the corresponding differential units, and a threshold element is connected to the winding located on the middle rod.

FIG. 1 is a schematic diagram of the device; in Fig. 2, an embodiment of the trigger indicator.

The device contains a current sensor 1 (Fig. 1), made in the form of an induction current transducer, which is installed between the two wires of the trunk part of the line 2 behind the branch point on the insulating distance from the wires and the control 15

draws the current of this part of the line. A current sensor 3, made in the form of an inductive current transducer, is installed between the branch wires 4 and monitors the branch current, current sensor 1 through the loader 5 and differentiating element 6 is connected to the first input of the trigger indicator 7, current sensor 3 through the actuator 8 and differentiator 9 to its second input, and antenna voltage converter 10 (APS) through rectifier 1 I integrating organ 12 and threshold element 13 are connected to the third input of indicator 7 for actuation.

The trigger indicator 7 (Fig. 2) is made in the form of a block of magnetic memory with an W-shaped three-pin magnetic conductor 14 with three windings and an arrow 15. The input windings 16 and 17 located on the outermost rods are connected through differentiating elements 6 21 9 and straightened The capacitors 5 and 8 with the corresponding current sensors 1 and 3, and the winding 18, located on the middle rod, are connected through the threshold element 13, the integrating body 12 and the rectifier II to the ALP 10.

The device works as follows.

During a short circuit, for example, a line appears at the output at the output of current sensor 3, which, through terminal 8 and differentiation, unit 9 arrives at the second input of indicator 7 and triggers it to a state corresponding to a short circuit on the branch. When a voltage is applied after the elimination of a short circuit, the signal from the ALP 10 through the rectifier 11, the integrating body 12 and the threshold element 13 enters the third input of the operation indicator 7 and puts it in the state corresponding to the absence of a short circuit. Integrating authority 12 provides the necessary time delay for the return. In the event of a short circuit on the line, the actuation indicator 7 is switched to the state corresponding to the short circuit on the line behind the branch point. As a trigger indicator, two polarized relays can be used, or two relays on reed switches with memory. The windings of operation of these relays are, respectively, the first and the second, which are connected in series, third.

The non-contact indicator of the operation is made in the form of a magnetic block.

.pam ti; with an arrow. The state of the trigger indicator 7 is determined by

in the magnetic needle, which is oriented to one of the three rods In the absence of a short circuit or short circuit to the branch point on the middle, with a short circuit on the branch, on the left, and in a short circuit on the highway behind the branch point on the right rod.

Thus, the proposed device allows you to choose one of three directions, rather than two, as all known, so it can be used in cases where the search for a short circuit location begins with an inspection of any device installed on the line. This search strategy is widely used in cases where the search location is located. The teams do not coincide with the substation and the search begins not from the first device, but also when the shortest path to the branch point is far from the line trunk, especially at. inaccessibility of the track.

Claims (2)

1. A device for determining the direction of a short circuit on an overhead line with branches according to the autor. No. 756323, that is, so that, in order to provide an automatic return to the initial 55 state, it is additionally equipped with an antenna voltage converter connected through a rammer, an integrating unit and a threshold leg and indicator, and a winding return. coping to the newly entered third input of the operation indicator. 2. The device according to claim 1, wherein the actuation indicator, made in the form of a magnetic memory block, is provided with an W-shaped magnetic pipe, on the extreme rods of which are located 8 56 windings, connected to the corresponding differential blocks, and a threshold element is connected to the winding located on the middle rod. Sources of information taken into account in the examination 1. USSR author's certificate 1 756323, cl. H 02 H 3/08, 1978. BUT - / Have 18