Acceptance tests of 35 kV equipment

During January and February 2021, the specialists of Avenston and Avenston Engineering organized the implementation of commissioning works and acceptance tests for high-voltage 35 kV equipment. The list of tested and verified equipment includes both complete closed-type transformer substations 35/0.4 kV (8 units), and open-type transformer substations 35/0.4 kV  (4 units), as well as switchgears 35 kV (26 high-voltage cells). The work performed includes electrical measuring work, high-voltage tests, adjustment of drives for 35 kV disconnectors and some others.

During this work, the following measurements were carried out: measurement of the transformation ratio of transformers, measurement of absorption coefficients of transformer windings, measurement of transient resistances, measurement of insulation resistances, measurement of DC resistance of windings, measurement of transformers at open circuit, checking the operability of blocks and circuits, checking operation of relay protection and vacuum switches. Also, the necessary adjustments, phasing were carried out, the current-voltage characteristics were taken and the configuration of the microprocessor relay of the relay protection and automation was carried out.

During the high-voltage tests, the windings of power transformers, current transformers, voltage transformers, overvoltage arresters of bushings, busbars and other equipment elements were checked using increased voltage. All laboratory measurements and tests are documented in the form of formal protocols.

Since 2010, Avenston has been providing a full range of services for the design, construction, commissioning and maintenance of all types of solar power plants. We have extensive practical experience in supporting the construction of both rooftop and ground-based solar power plants. Also, our specialists regularly conduct scheduled and unscheduled technical audits for commercial solar PV power plants.