Method and apparatus for operating switch with a connectable currunt limiter
A technology of switchgear and current limiter, which is applied in high-voltage/high-current switches, electric switches, high-voltage air circuit breakers, etc., and can solve problems such as difficulty in operation and commutation failure
Inactive Publication Date: 2006-03-29
SIEMENS AG
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- Description
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Problems solved by technology
The switching voltage of the limiter must additionally be overcome when the arc is to be commutated again into the arc chute, so this commutation process may be difficult leading to commutation failure
Method used
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[0024] In the following, two measures according to the invention will be explained in particular, by using each of these two measures or their combination, the problem of possible failure of the switches caused by the PTC limiter in the branch circuit of the circuit breaker can be avoided.
[0025] FIG. 1 shows schematically the installation of a limiter device such as that shown in EP 0 657 062 B1 in a branch circuit of a circuit breaker.
[0026] In Fig. 1, a current limiting circuit breaker has at least two contacts 22 and 23, at least one of which is designed to be movable and can be opened or closed by a locking mechanism 24, which can be A thermal and / or magnetic release 25 or 26 is released. Each contact 22 and 23 is assigned an arc slide rail 27 and 27', these arc slide rails surround an antechamber area 28 and lead into a center with a plurality of for extinguishing not shown in Figure 1 In the arc extinguishing chamber 21 of the arc extinguishing grid 29 of the arc....
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Methods for operating a power switch with at least one main current path and associated secondary current path with an arc extinguisher are known from the art. A current limiter can be used which switches from non-current limiting operation to the current limiting operation at high current loads. The invention is characterized by measures for returning the current limiter during the transition from the current limiting operation to the non-current limiting operation. Specifically power switches are provided with measures for preventing a recommutation of the arc from the secondary current path to the main current path and / or measures for returning the current limiter during the recommutation of the light art. A corresponding arrangement for carrying out the inventive method is provided with means (30 to 50) in the power switch (20) and / or current limiter (1) for preventing a switch failure of the current limiter (1) disposed in the secondary current path of the power switch (20). The current limiter can be especially a PTC current limiter (1).
Description
technical field [0001] The invention relates to a method for operating a switching device with a switchable current limiter. In this case, the switching device is in particular a circuit breaker or a contactor, possibly also a semiconductor switch or the like. Furthermore, the invention also relates to a device for carrying out the above-mentioned method. Background technique [0002] In the event of a short circuit, the switching device protects the power supply network and electrical appliances by rapidly establishing a sufficiently high switching operating voltage, thereby limiting the short-circuit current and cutting off the current in a short time. To increase the current limit value, the effective switching operating voltage is increased by connecting a switching device in series with a separate current limiter. For this purpose, according to the prior art, the limiter is connected in the main circuit, but therefore also in normal operation, as in the event of a sho...
Claims
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IPC IPC(8): H01H9/42H01H9/46H01H9/38H01H33/12H01H33/16
CPCH01H1/20H01H9/465H01H9/42
Inventor 戴维·W·布兰斯顿弗里茨·波尔卡尔-汉斯·贝恩克劳克里斯琴·施雷金格
Owner SIEMENS AG