Switch with a testable electricity converter and method for testing an electricity converter

Abstract

#CMT# # / CMT# The switch (S) has a switching mechanism configured to separate switching contacts to open a switch, a measurement transformer arranged at a conductor and configured to generate an analog measurement voltage corresponding to the alternating current. An input of a monoflop (M1,M2,M3) is connected to a pole of a power converter (2a,2b,2c). The transducer voltage of the monoflop is set such that a predetermined period is provided up to reset of the monoflop and that the level at an output of the monoflop is used for checking the function of the power converter. #CMT# : # / CMT# An independent claim is included for a method for testing a power converter of a power supply of a switch. #CMT#USE : # / CMT# Switch, particularly circuit breaker, for low voltage for interrupting an alternating current flowing through a conductor, and distributing the current in electrical switchgear. #CMT#ADVANTAGE : # / CMT# The switch has an input of a monoflop, which is connected to a pole of a power converter , where transducer voltage of the monoflop is set such that a predetermined period is provided up to reset of the monoflop and that the level at an output of the monoflop is used for checking the function of the power converter, and hence protects electrical switchgear, prevents damage of electrical switchgear, and ensures reliable operation of switch. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a circuit diagram of a power supply. 1 : Power supply 2a,2b,2c : Power converter D1,D2,D3 : Diodes M1,M2,M3 : Monoflop S : Switch.

Description

technical field [0001] The invention relates to a switch with verifiable current transformers, in particular a power switch for low voltages, and a method for verifying the current transformers of the switch. Background technique [0002] Switches, in particular in the form of low-voltage power switches, are known and serve to interrupt the alternating current flowing through conductors. Switches are used to distribute current to electrical switching devices and for their protection. The switch has switch contacts which are separated from each other by the switch mechanism to open the switch. A current transformer arranged on a conductor in the form of an air-core coil (Rogowski coil, Rogowski spule) serves as a measuring transformer and generates an analog measuring voltage corresponding to the alternating current, the conductor serving as the primary winding. Depending on the measured voltage, in the event of a continuous overload or in the event of a short circuit, the ...

AI Technical Summary

Problems solved by technology

[0006] In this circuit concept the currents of each individual transducer are analyzed indistinguishably for each channel

From this it is also not possible to determine which transducer input is energized or which is not, especially since in a three-phase current bridge rectifier a balancing current flows between the transducers

[0007] A disadvantage in known power supplies is that the transducer cannot be checked continuously

Failure to identify and report possible damage and thus non-functioning switches so that the plant operator cannot immediately replace the transducer or switch

Images