The invention relates to a control device (1) for reducing electrolytic corrosion in a brushless direct-current motor (3). The control device (1) is designed to control phases (9, 11, 13) of the brushless direct-current motor (3). The control device (1) has a potential equalization connection (5) and a potential equalization line (7). The potential equalization line (7) is designed to connect the brushless direct-current motor (3) to the potential equalization connection (5). An anti-corrosion resistor (R.sub.K) is provided on the potential equalization line (7), which anti-corrosion resistor is designed to reduce a current flow between the phases (9, 11, 13) of the brushless direct-current motor (3) and the potential equalization line (7).

The invention relates to a control device (1) for reducing electrolytic corrosion in a brushless direct-current motor (3). The control device (1) is designed to control phases (9, 11, 13) of the brushless direct-current motor (3). The control device (1) has a potential equalization connection (5) and a potential equalization line (7). The potential equalization line (7) is designed to connect the brushless direct-current motor (3) to the potential equalization connection (5). An anti-corrosion resistor (R.sub.K) is provided on the potential equalization line (7), which anti-corrosion resistor is designed to reduce a current flow between the phases (9, 11, 13) of the brushless direct-current motor (3) and the potential equalization line (7).

Coupled multielectrode array sensors (CMAS) have been used for corrosion monitoring for cathodically protected systems. The evaluation of the effectiveness of the cathodic protection (CP) with the CMAS is by using the measured corrosion rate or corrosion current. When the corrosion rate is low or zero, the CP is effective. However, the CMAS has not been used to indicate the effectiveness margin for the degree of protection, called cathodic protection effectiveness safe margin (CPEM) in this disclosure.

This invention discloses a method to derive the CPEM from a multielectrode sensor to indicate how safely a pipe in soil or a metal structure in an electrolyte is cathodically protected. This invention also discloses a method to determine the optimum range of cathodic protection based on the currents from a multielectrode sensor.

Coupled multielectrode array sensors (CMAS) have been used for corrosion monitoring for cathodically protected systems. The evaluation of the effectiveness of the cathodic protection (CP) with the CMAS is by using the measured corrosion rate or corrosion current. When the corrosion rate is low or zero, the CP is effective. However, the CMAS has not been used to indicate the effectiveness margin for the degree of protection, called cathodic protection effectiveness safe margin (CPEM) in this disclosure.

This invention discloses a method to derive the CPEM from a multielectrode sensor to indicate how safely a pipe in soil or a metal structure in an electrolyte is cathodically protected. This invention also discloses a method to determine the optimum range of cathodic protection based on the currents from a multielectrode sensor.

A method and apparatus is described that uses a device that presents a surface of a dielectric material to a flowing or circulating fluid that results in charge being created at a boundary layer of the dielectric where it contacts the fluid by ion exchange and charging of compounds, for example insoluble dielectric particles such as colloids, and using at least one control impedance to control an impressed current in the fluid caused by the fluid flowing through the device and to cause suspended particles in the fluid to be charged, whereby the charge of the suspended particles is then neutralised causing coagulation of the particles as suspended insoluble particles.

The present invention relates to a system for distributing electrical energy, comprising an electricity grid configured to supply electrical energy to end users, characterized in that the grid is operated on a direct voltage.

The present invention relates to a system for distributing electrical energy, comprising an electricity grid configured to supply electrical energy to end users, characterized in that the grid is operated on a direct voltage.

A cathodic protection system providing substantially complete coverage to individual steel-in-concrete units in a multi-unit structure. The system includes a power supply, an electronic circuit board, a header cable, anode wire in each unit connected to the header cable, an adhesive connector in each unit, and a conductor in each unit.

A cathodic protection system providing substantially complete coverage to individual steel-in-concrete units in a multi-unit structure. The system includes a power supply, an electronic circuit board, a header cable, anode wire in each unit connected to the header cable, an adhesive connector in each unit, and a conductor in each unit.

A method for preventing corrosion of a spent nuclear fuel canister by using electrolytic corrosion protection, according to the present invention, has an effect of enabling a semi-permanent operation and, particularly, has effects of preventing oxidation and corrosion problems of a canister made of a metal material, in consideration of various environmental variables that may cause corrosion, and ensuring the structural stability of the canister so as to enable a semi-permanent operation.