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Researchers from a Czech university have developed and successfully implemented a device optimised for special testing of a transformer’s resistance during its short-time overload. The advantage of the equipment is that the power loading of a transformer may be recovered back to the mains without being dissipated. The researchers are looking for manufacturing partners interested in a licensing agreement.
A team of the Czech researchers have developed and successfully tested a solution for testing control transformers.
The test of the transformer’s resistance during its short-time overload lies in determining the output voltage drop at the transformer that is overloaded for a short time by a specified high load. The test evaluates the operating situation of the transformer that supplies several electrical circuits and is several times overloaded by one of them for a short time. The voltage drop must not be so high such that the overloading circuit should not influence the function of other circuits.
Nowadays, the transformers are tested so that the primary circuit is connected to the public grid, the secondary circuit is loaded with preselected loads and the voltage and current values are observed. The drawback of such tests is that all the power used for the test is taken from the grid and is dissipated to heat. As the testing currents are high, the connection must be made of thick wires and even so, voltage drops on the public grid are generated.
The newly developed and tested equipment enables the regeneration of transformer loading power to the power mains without being dissipated in the loads. Therefore, only such loads which are sized in fractions of testing load power are used. It will significantly reduce both power consumption and price of testing for the device.
The device uses three-phase mains such as a triple voltage source with defined phase shifts. In this way, the generation of the desired measuring and reference voltages is facilitated, since their magnitudes and phase shifts are much more stable than at phase shifters.
The reading of variables is performed by means of a digital measuring device that allows the required fast readings of voltage and current and predefined short-term load settings.
The researchers are looking for manufacturing partners (e.g. manufacturers of transformers) interested in a licensing agreement. The subject of the licensing will be know-how (device principle, detailed scheme of working etc.) as well as know-how for manufacturing of the device.
- Power loading the transformer may be recovered back to the mains without being dissipated
- Recovery will significantly reduce the electric power consumption of the testing device and will also reduce cost of the testing device implementation because it will not dissipate high powers.
The technology offered has been successfully tested at the university laboratory.
Czech patent granted, European patent (EPO) application not yet granted.
The university would like to cooperate with a partner from industry, who would like to manufacture the offered technology based on a license agreement.