Voltage transformer loop disconnection phenomenon and its processing method - Database & Sql Blog Articles

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The phenomenon of a voltage transformer loop disconnection includes the following: 1. The active power meter shows an abnormal reading, the voltmeter reads zero or the three-phase voltages are unbalanced, the energy meter does not rotate or turns slowly, and the low-voltage relay activates. 2. If the high-voltage fuse is blown, there may be a grounding signal. The insulation monitoring voltage drops below normal levels, while the monitoring voltmeter on the normal phase still shows normal readings. 3. The “voltage transformer circuit disconnection” indicator light is on, and the alarm bell sounds. Common causes for a voltage transformer loop disconnection include: 1. Blown fuses on both the primary and secondary sides of the voltage transformer. 2. Poor contact between the auxiliary contacts in the voltage switching circuit and the switch. 3. Loose or broken wire connections in the circuit. To address a voltage transformer loop disconnection, follow these steps: 1. Carefully inspect whether the high-voltage or low-voltage fuses are blown. If the high-voltage fuse is damaged, isolate the voltage transformer, remove the low-voltage fuse, replace the high-voltage fuse after testing and discharging, and check the insulation of the transformer. Once confirmed to be safe, restore power. If the low-voltage fuse is blown, replace it. However, if the new fuse blows again, further investigation is required to identify and resolve the underlying issue before reinstallation. 2. Disable any relevant protection systems and automatic devices to prevent false trips or malfunctions. 3. If spare equipment is available, deactivate the faulty unit and immediately switch to the backup equipment to maintain system stability. Ensuring proper maintenance and timely troubleshooting of voltage transformer loops is essential for the safe and reliable operation of electrical systems.