DE1916567A1 - Short-circuit indicator with remote indication - Google Patents

Description

Short-circuit indicator with amber message.

The invention relates to a device for displaying short circuits in electrical line or cable networks, especially in mid-voltage networks. These medium-voltage networks are designed for operating voltages between 6 and 90 kV, have numerous switching and distribution stations as well as transformer stations for supply the low voltage consumer. If short circuit faults occur in a Station or in the cable or overhead line train between the stations, the entire Power supply through the protective devices housed in the main or feeder station switched off.

Care must now be taken to locate the damaged area as quickly as possible, to initially at least the affected power supply through appropriate circuit measures and, above all, continue to operate the remaining, intact power supply unit without delay to be able to.

For this purpose, devices have become known that indicate the short-circuit fault. Their function is, for example, that using a soft iron core Line of force field excited by the flow of current in a power line to a mechanical one Display device acts. The core is ring-shaped or U-shaped and e.g. plugged onto a cable core; A rotating armature is located between the magnetic poles with a pointer that deflects in the event of an overcurrent in the cable and thus the short circuit in the shows the infected network section. Trouble-shooting is thus much easier, because when the network management is being carried out from station to station, the damage area is without further can be recognized by the position of the short-circuit indicator. After elimination after the fault they have to be reset manually.

But in order to avoid the tedious driving down of the network routes by people avoid, other devices have also become known, the the disorder telecommunication. However, these require additional devices, such as converters, relays; Shielding gas magnet or microswitches and / or the like, which represent a considerable effort.

Because of the large number of stations, however, there is a question of economic efficiency of vital importance. It is therefore desirable to have safely working devices to produce with as little effort as possible and also to arrange them afterwards to be able to carry out in already existing systems in a simple way.

The invention takes these requirements into account and proposes in principle the use of a contactless, based on an electronic circuit System. It consists in the arrangement of a magnetic circuit provided with a coil and an electronic circuit, the control of which is obtained from the coil Energy takes place.

The magnetic circuit each includes a conductor of the network, so that in A voltage is induced in the coil, the intensity of which depends on the value in the conductor the prevailing current. When a short circuit occurs Overcurrent, the induced voltage reaches the level required to respond to the electronic Circuit, for example the amount required to trigger a thyristor. on the other hand the system can achieve any desired overcurrent level by varying the number of coil turns be adjusted at which the trip is to take place. The functional values of the system can thus be easily identified with sufficient accuracy Predetermine the conditions of the stations accordingly. The electronic circuit causes a signaling circuit to close, but avoids failure-prone and mechanical contacts requiring maintenance. The device is in the usual way connected to the message lines, so that, for example, the short-circuit fault in the main station is shown.

The arrangement of the electronic circuit for this purpose requires only a few components that are known to be able to be accommodated in a small space. Furthermore, the energy requirement for the control is insignificant, so that the Components of the system, such as magnetic circuit and coil, can be made very small.

In the drawing, an embodiment of the display device is shown in FIG of the invention shown. Fig. 1 illustrates the mechanical structure in side view and FIG. 2 in plan view.

An iron core 2 accommodating the coil 1 is with the soft iron strip 3 combined to form a magnetic circuit. The connection is by means of the screws 4 made. These components also serve to attach the device to a insulated conductor within a station, e.g. on cable core 5, which is connected to the Magnetic circuit is enclosed. The winding ends of the coil lead into the housing 6, in which the components of the electronic circuit are housed.

Claims (4)

P a t e n t a n s p r ü c h e 1. Short-circuit indicator with remote signaling for electrical line and Cable networks, especially for medium-voltage networks, characterized by the arrangement a magnetic circuit comprising the conductor and provided with a coil, and an electronic circuit Circuit controlled by the energy obtained from the coil. 2. Short-circuit indicator according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the electronic circuit closes a signaling circuit causes. 3. Short-circuit indicator according to claim 1 and 2, d a d u r c h g e k e n n -z e i c h n e t that the magnetic circuit consists of an iron core carrying the coil and a soft iron band. 4. Short-circuit indicator according to claim 1 to 3, d a d u r c h g e k e n n -z e i c h n e t that the function values by varying the number of coil turns can be influenced.