Electrical facility and arrangement for protecting the electrical facility

Patent metadata

Field	Value
Publication number	US-10074974-B2
Application number	US-201514954327-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Dec 3, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

An arrangement for protecting an electrical facility from overvoltages having an overcurrent protection facility arranged in a first series circuit and a shunt circuit arranged between the overcurrent protection facility and the electrical facility to be protected, the shunt series resulting in a second series circuit, wherein a diode for discharging transient overvoltages is arranged in the shunt circuit, which is conductive if a voltage threshold is exceeded, as a result of which the current resulting from the overvoltage can be passed through the shunt circuit to the facility to be protected into the second shunt circuit, where a first inductor is arranged in a series connection to the diode, the diode is connected here to a first diode terminal on the first series circuit and is connected to a second diode terminal on the first inductor, and where the overcurrent protection facility is not triggered prematurely by temporary overvoltages.

First claim

What is claimed is:

1. An arrangement for protecting an electrical facility from overvoltages, comprising:
an overcurrent protection facility arranged in a first series circuit;
a second series circuit;
a shunt circuit arranged between the overcurrent protection facility and the electrical facility to be protected, said shunt circuit leading to the second series circuit,
a diode for discharging transient overvoltages arranged in the shunt circuit, said diode being conductive, if a voltage threshold is exceeded such that current resulting from the overvoltage is passed through the shunt circuit to the facility to be protected into the second series circuit;
a first inductor arranged in a series connection with the diode, wherein the diode being connected to the first series circuit at a first diode terminal and being connected to the first inductor at a second diode terminal, whereby with temporary overvoltages the overcurrent protection facility is not triggered prematurely;
a second inductor connected in the first series circuit between the shunt circuit and the electrical facility to be protected; and
a capacitance connecting the first and second series circuit between the second inductor and the electrical facility to be protected;
wherein the first inductor is coupled to the second inductor such that the two inductors interact magnetically with one another, wherein the first and second inductors have windings arranged in the same direction, such that a first start of winding of the first inductor is connected to the second diode terminal of the diode and a second start of winding of the second inductor is connected to the first diode terminal of the diode.

2. The arrangement as claimed in claim 1 , wherein the first and the second inductors are formed as a component.

3. An electrical facility having a first terminal and a second terminal for connecting a supply voltage, wherein the arrangement as claimed in claim 1 is connected to the first terminal and the second terminal such that a capacitance is arranged between the first terminal and the second terminal and the supply voltage is guided via the arrangement to the facility.

4. The electrical facility as claimed in claim 3 , wherein electrical facility comprises an automation component which is implemented in industrial automation.

5. The arrangement as claimed in claim 2 , wherein the component comprises a current-compensated throttle.

Assignees

• Siemens Ag

Inventors

• Prochaska Dirk

Classifications

• H02H9/041

  using a short-circuiting device · CPC title

• H02H3/202 Primary

  for DC systems · CPC title

• H02H9/045 Primary

  adapted to a particular application and not provided for elsewhere · CPC title

• H02H9/042 Primary

  comprising means to limit the absorbed power or indicate damaged over-voltage protection device · CPC title

• H02H9/02

  responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} · CPC title