DE1488895C - Excess temperature release, especially fuse - Google Patents

Claims (3)

1 2 The invention relates to an over-temperature, which is the glow discharge in action temperature release, in particular fuse with bimetal. With the securing of the ignition is omitted switch that, in the event of excess temperature, causes a circuit to be the most important obstacle in the professional world, glow, interrupts and using one of the same electric circuit charge tubes in monitoring circuits, dependent heating switches on, which switches on the bimetallic 5 If you switch the glow lamp trigger in from switch holds in its open position, as long as the externally visible position is installed, it can be used at the same time. Operating voltage is available. Use in good time for a visual display. ^ It is known that bimetallic switches are used as temperature. Furthermore, one can use the glow lamp trigger use guardian. You can also directly from one into the winding of an electrical device, e.g. B. temperature to be monitored or from the thermo of an electric motor, whereby he despite the mix image of a different physical variable does not influence possible reclosing from the outside will. They serve to cause the cause to be accessible. With an alternating current the Direct or indirect overtemperature, e.g. B. by means of an electric motor, you can use each phase separately a relay to switch off. monitor a trigger. In particular, with a disadvantage in most known devices, the 15 single-phase motor, ζ. Β. a drive motor for It is of this nature that the bimetallic switch for some time a refrigerant compressor can be used in the main after the response closes again, because with the winding and in the auxiliary winding, the trigger is switched off the cause of the excess temperature builds on different responses the temperature at the bimetal drops. It can be designed for temperatures. therefore happen that despite the error the system ao The invention will be put back into operation below with the aid of one and the switching embodiment in connection with the game of the bimetallic switch one or more times explained in more detail drawing in which the circuit diagram brings one until the error is noticed. It is true that it was possible to monitor the transformer according to the invention ver the release is illustrated mechanically in the release position. '
latch; However, this measure is not usable anywhere where the overtemperature release on a network is connected to the primary inaccessible or distant point via a main switch 3, the primary inaccessible or remote point, winding 4 of a transformer 5, whose animal is connected, e.g. B. in the winding of an electrical secondary winding 6 to high-voltage connection machine, terminals 7 and 8 leads. In the primary winding there is then a temperature release of the input 30 a glow discharge tube 9, known of the type described, in which the bimetallic temperature of the winding is influenced. In the evacuation switch, a heating resistor is connected in parallel, th interior 10 of this tube is a bimetallic switch 11 which is short-circuited by the switch in normal operation and which closes at excess temperature and is therefore ineffective. When the winding 4 is open, it opens. However, the full operating voltage is applied to the switch. It is preferably designed in such a way that the current flows through the heating resistor; Its heating power is then sufficient to heat the winding current flowing through it to keep the bimetal switch open. This state, which is generated in the bimetal itself and has as little influence as possible, is only eliminated when the behavior of the bimetal has been influenced by external influences.
flow acquisition, e.g. B. manually, the operating voltage As soon as the switch opens, is created between is interrupted. 40 the fixed contact 12 and the movable part 13 The heating resistor consists of heating wire. This of the bimetallic switch has a glow discharge 14, which must be very thin wire so that in the event of a fault. Heating power for keeping the switch 11 open, no excessive current flows in the circuit. As a result- sufficient. In order to generate the glow discharge, it is very sensitive to mechanical or electrical loads, essentially the entire operating voltage. In the case of a wire connection, terminals 1 and 2 are available, since the chip breakage means that the release cannot be used. voltage drop within winding 4 is negligible. The invention has for its object to be a casual one. Specify overtemperature release, which has the advantages The glow discharge remains until the last-mentioned type has, but with a simple main switch 3 is opened. Only then can the build-up be much less at risk. 50 cool the winding thermostat and return to its position of rest according to the invention. Thereafter, the arrangement can be solved that the bimetal switch is arranged in a glow emptying, if necessary after repair of a damage, the normally closed contacts of the bimetal switch are put into operation again by inserting the switch 3,
in the event of excess temperature, open the 55 Form electrodes of the glow discharge tube and claims:
between them there is a glow discharge of such a heating power that the bimetal switch remains open. I. Over-temperature release, in particular -siche-Bci of such a glow discharge path, requires a bimetallic switch, which does not interrupt a thin-wire and therefore sensitive 60 door circuit and thereby a heating winding. The glow discharge between the contacts of the bi-metal switch, which is dependent on the same circuit, switches on, which automatically holds the bi-metal switch in its open position, as long as the operating voltage is heating power; because the closer the contacts are to one another, characterized by being different, the stronger the heating output. 65 that the bimetal switch is in a glow! The ignition of the glow discharge path is arranged in the charge tube, whereby the normal- [I in principle, even with aging, not critical, since wise closed contacts of the bimetallic switch always an opening spark when the switch is opened due to excess temperature Open the electrodes of the glow discharge tube and form a glow discharge between them such heating power occurs that the bimetal switch remains open. 2. Overtemperature release according to claim 1, characterized in that it is in the winding an electrical device is installed. 3. Overtemperature release according to claim 1 or 2, characterized in that it is in of externally visible location is installed. 1 sheet of drawings