In a transformer, bushings are responsible for conducting energy between the transformer and the external environment. To ensure their integrity and reliability, tests are conducted to identify potential failures and ensure optimal performance over time.

Failures in bushings and high-voltage circuit windings are among the main causes of forced interruptions in power transformers. Typically, these failures occur due to insulation deterioration resulting from continuous dielectric and thermal stresses the equipment undergoes during operation.

For this reason, ensuring the reliability of transformer bushings requires a monitoring system that provides access to real-time equipment conditions and necessary tests.

Types of tests that can be performed on transformer bushings include capacitance and Tangent Delta tests, as well as Partial Discharge tests on high-voltage windings.

Capacitance and Tangent Delta tests verify the condition of electrical insulation in high-voltage equipment. Capacitance indicates the insulation capability of the component, while Tangent Delta reveals the amount of dielectric losses in the system.

Partial discharge testing can identify premature failures, wear, and internal defects in transformers. Partial discharges are internal faults in a transformer where a portion of the current conducts through an unintended path. This test helps predict potential issues before they become critical, allowing for more accurate and efficient corrective maintenance.

HVEX Transformers Condensive Bushing Monitor for Partial Discharges

Transformers Condensive Bushing Monitor for Partial Discharges

 monitoring system performs online measurement of partial discharges in high-voltage windings, capacitance, and dissipation factor (Tan δ) of capacitive bushings in power transformers, providing precise information about the device's insulation.

 uses the electrical method to measure partial discharges in capacitive bushings through the capacitive tap, which indicates the insulation characteristics of the device through voltage measurements.

This device serves as the interface linking the monitored device to the DP Meter data acquisition system. In the HVEX system, three capacitive couplers function as sensors connected to 3 input channels of the processing and communication center of an electrical panel. The system includes proprietary software for data processing and communication management with other equipment in the substation and supervisory systems.

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Essential in asset management, HVEX's PD Monitor is an advanced solution for power transformer monitoring, designed to detect and assess faults in high-voltage bushings and windings. Its performs online measurements of partial discharges, capacitance, and dissipation factor in condenser bushings, providing information about insulation status and facilitating preventive maintenance 

Reliability of Transformer Bushings with Bushing Monitor for Partial Discharges

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Reliability of Transformer Bushings with Bushing Monitor for Partial Discharges

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