Estimation of Sensitivity of the Optical arc Relay Protection of High-Voltage Electrical Installation-Wok of Case Structure

The most severe type of damage of the most common elements of electrical networks - high-voltage switchgears (switchgear) with a voltage of 6-10 kV are internal short circuits (SC), accompanied by an electric arc. In the field of high-speed protection against this type of damage most of protection is based on the principle of control of luminous flux and current. Photothyristors, transistors, diodes, resistors or fiber-optic lines are used as optical sensors. The effectiveness of solving the above problem largely depends on the choice of algorithms for the functioning of the protection, the sensitivity of the optical sensor and the optimal choice of its location inside the switchgear cells. The paper considers approaches to assessing the sensitivity of arc protection without taking into account the features of the used optical information sensors. The column of a high-voltage electric arc is represented by a cylindrical emitter, the parameters of which depend on the short-circuit current.