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2025-12-31How to determine if a Hall sensor is working properly?
I. General Testing Methods 1. Multimeter Voltage Test Use a multimeter to measure whether the power supply voltage is normal (e.g., 5V or 12V), and then measure whether the signal line voltage changes -
2025-12-29What are the consequences of incorrect polarity in a current transformer?
I. Impact on Measurement 1. Energy Metering Errors: Reversed polarity can lead to under-metering or reverse metering. For example, a 10kV line under-metered by 18,000 kWh over 5 days, causing line los -
2025-12-26How to Properly Install Split Core Current Transformers?
I. Pre-Installation Preparation 1. Selection and Verification Select the transformer ratio based on the load current. For example, if the measured maximum current is 820A, select an 800/5A transformer -
2025-12-24How to prevent excitation faults in current transformers?
I. Regularly conduct excitation characteristic tests. Test objective: To check the core quality through the volt-ampere characteristic curve, determine the presence of inter-turn short circuits, and c -
2025-12-22How to determine if a current transformer is energized?
I. The core test is the excitation characteristic test. This test involves applying voltage to the secondary winding, measuring the corresponding excitation current, and then plotting it as a curve (v -
2025-12-19
What safety precautions should be taken when wiring current transformers?
1. Secondary side must be reliably grounded. All current transformers must have their secondary side S2 terminal grounded at a single point to prevent high voltage from the primary side from entering -
2025-12-17
How to ensure correct wiring of three-phase current transformers?
1. Reducing Polarity Principle Current transformers use a reducing polarity marking method. The primary winding L1 and secondary windings K1 and K2 are of the same polarity. If the terminal markings a -
2025-12-15
How to determine if the polarity of a current transformer is correct?
1. DC Method Connect the positive terminal of a 1.5V dry cell battery to the primary side P1 and the negative terminal to P2; connect the secondary side S1 to the positive terminal of a pointer-type m -
2025-12-12
How to correctly wire a three-phase current transformer?
1. Reduction of Polarity Principle The primary current flows in from P1 and out from P2, while the secondary current flows out from S1 and in from S2, and S2 must be grounded. If the primary side is r -
2025-12-10
How to handle an open circuit on the secondary side of a current transformer ...
1. Immediately disconnect power and deactivate protection: Upon discovering an open circuit, immediately disconnect the power supply to the relevant equipment and deactivate any potentially malfunctio -
2025-12-08What to do if the secondary side of a current transformer is open-circuited?
1. Immediate Reporting and Protection Deactivation: Upon discovering an open circuit, immediately report to dispatch and deactivate any potentially malfunctioning protection devices. If the ammeter di -
2025-12-05What phenomena occur when the secondary side of a current transformer is open...
1. High Voltage: After the circuit is open, the magnetic flux of the iron core increases sharply, which may induce a voltage of several thousand volts on the secondary side, breaking down the insulati