A method for verifying that a disconnect is open includes providing a disconnect verification unit electrically connected to a load side of a disconnect to be verified, having the disconnect verification unit determine whether the contact for each phase of the disconnect is open, having the disconnect verification unit determine whether the leads are connected to the load side of the disconnect; and sending a signal to a user interface of a status of the disconnect.

In order to be able to perform a shutdown test on an inverter with little expenditure, a trigger signal is modulated to the AC current or the AC voltage at a first moment, and the inverter is used at a second moment, which occurs a defined duration after the start of the trigger signal at the first moment, to generate an AC current or an AC voltage with a fault signal that is detected by the inverter and which triggers a shutdown of the inverter, and the shutdown moment of the AC current or the AC voltage is determined. A shutdown duration of the inverter is determined from the difference between the shutdown moment and the second moment.

The application provide a high-voltage interlock device and a fault detection method thereof. The high-voltage interlock device includes: a first signal detection circuit, configured to collect a first original electric signal from a high-voltage interlock component and convert the first original electric signal into a first sampled signal while ensuring that the high-voltage interlock component is isolated from a fault diagnosis module; a second signal detection circuit, configured to collect a second original electric signal from the high-voltage interlock component and convert the second original electric signal into a second sampled signal while ensuring that the high-voltage interlock component is isolated from the fault diagnosis module; the fault diagnosis module, configured to determine a fault of the high-voltage interlock component according to the first and/or the second sampled signal, under a condition that at least one of the first and the second switch modules is in an OFF state.

Method for detecting a state of a switching unit, the switching unit comprising an element that is movable between a first position and a second position.

A gas monitoring system includes a gas-insulated switchgear, wherein the gas-insulated switch gear has at least two separated chambers which are filled with an insulating gas surrounding high or medium voltage components. A first sensor is connected to the first chamber and a second sensor is connected to the second chamber, both sensors adapted to measure a physical property of the insulating gas in their respective chambers over time. A computer unit is adapted to calculate from the two sensor measurements a leakage rate of the insulating gas in one of the two chambers using an adaptive filter, in particular a Wiener filter.

Test device having a signal input with a positive pin and a negative pin, between which an-input signal may be applied. Test device has a separation unit which is connected to the positive pin and to the negative pin and is configured to separate a positive signal component in the form of a positive track from the input signal, to output said signal component at a first pin, to separate a negative signal component in the form of a negative track from the input signal and to output said signal component at a second pin. The use of the test device to test a control unit of the switching device is described, wherein the test device simulates the switching device, the signal input of the test device is connected to the control unit and the control unit outputs an input signal to the signal input.

A method of operating a spring-loaded drive of a medium-voltage switchgear system includes at least the following steps: measuring a drive current of an electric auxiliary drive for loading a drive spring of the spring-loaded drive of the medium-voltage switchgear system; loading the drive spring by the electric auxiliary drive; creating an evaluation data set in accordance with the measured drive current; comparing the evaluation data set with an expectation; and outputting a maintenance signal in accordance with a result of the comparison. There is also described a spring-loaded drive and a medium-voltage switchgear system having a spring-loaded drive of this type.

A system for controlling power supply to a load from a power supply line including a first circuit, at least a second circuit, a control module, and a monitoring module. The first circuit includes a first path for supplying power to the load, and a first switching mechanism for controlling the supply of power through the first path. The second circuit includes a second path for supplying power to the load and a second switching mechanism for controlling the supply of power through the second path. The control module is configured to output control signals to control operations of the circuits to independently switch on or off each of the respective paths. The monitoring module is configured to monitor physical quantity parameters of the paths, to detect deviations of the physical quantity parameter values from respective reference values to check the consistency between the first and second path.

A contact monitoring device for monitoring an electrical contact having a first contact state and a second contact state includes: an oscillator circuit for generating an excitation signal; a coupler including a signal input and a signal output, the oscillator circuit being connected upstream of the signal input in order to apply the excitation signal to the coupler, the coupler converting the excitation signal into a contact monitoring signal and outputting the contact monitoring signal at the signal output in order to act on the electrical contact; and a detector for detecting a version of the excitation signal in order to monitor the electrical contact. A first impedance value is set with the electrical contact in the first contact state on the oscillator circuit, and a second impedance value is set with the electrical contact in the second contact state on the oscillator circuit.

The present disclosure relates to a circuit breaker opening/closing assistance apparatus for correcting a thermal image of a circuit breaker on the basis of a visible image of the circuit breaker, and assisting an opening/closing operation of the relevant circuit breaker on the basis of a temperature identified through the corrected thermal image. Further, the present disclosure relates to a circuit breaker opening/closing assistance apparatus for identifying a temperature of a circuit breaker in which a failure has occurred, on the basis of a thermal image of the circuit breaker, and assisting an opening/closing operation of the relevant circuit breaker on the basis of the identified temperature.