I. IntroductionWith the rapid development of power systems and the advancement of computer technology and communication technology, relay protection is further developing rapidly in the direction of computerization, networking, integration of protection, measurement, control, data communication and

1. Voltage problemReason: High voltage will cause the transformer to be over-excited and the sound will become louder and sharper, which will directly seriously affect the noise of the transformer.Judgment method: First look at the low-voltage output voltage. Do not look at the voltmeter on the low-

1 structureThe core part of the three-phase oil-immersed transformer is composed of a closed iron core and windings wrapped around the iron core posts. In addition, there are oil tanks, oil conservator cabinets, casings, breathers, explosion-proof pipes, radiators, tap changers, gas relays, thermome

1. Abnormal sound: The transformer emits a uniform and rhythmic "buzzing" sound during normal operation. If other abnormal sounds occur, it is abnormal sound. The main reasons are as follows:① When a large-capacity power equipment is started, the load suddenly increases and the transforme