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What are the current transformer detection methods?
Current transformers function as current transformers and electrical isolation. To facilitate the measurement of the secondary instrument needs to be converted to a relatively uniform current, avoiding the danger of directly measuring the current transformer circuit. Current transformer detection methods are: transformer comprehensive tester: measuring the error between the standard transformer and the transformer under test, display the operating current.
Standard Current Transformer: Used as a standard instrument in transformer verification, the accuracy is generally more than two levels higher than the measured one. The design has multiple ratio change taps to adapt to the verification of different transformers.
Regulator: used to adjust the test current, generally installed in a console with the protection and switches, and sub-coarse and fine-tuning two regulators to meet the regulation fineness. When the rated current is less than 2500A, it can be made by using a 10KVA general regulator. The larger current must be specially made. Generally, it needs 30~60KVA.
Ramp: Cooperate with the regulator to match the required test current. Its capacity and cost increase with current.
High-current connection cable: connect several hundred, several thousand ampere current, cable price can not be ignored.
Load box: Simulate the actual working status of the transformer under test.
Current transformer detection should pay attention to the following items:
1ã€Is the insulation sleeve clean, whether there is defect, crack and discharge phenomenon, whether the sound is normal, and whether the casing is cracked or broken.
2. The appearance of the oil-filled current transformer should be clean, whether the oil level is normal and there is no oil leakage.
3, lead and wire clips and the secondary loop connection should be good contact, not slack.
4. The housing and the secondary circuit are well grounded, and the grounding wire should be fastened reliably.
5, whether the joints overheating and ignition, bolts loose, with or without abnormal odor.
6. If the three-phase indication value of the ammeter is within the allowable range, the current transformer has no load operation.
7. Whether the secondary winding is open or not, the grounding line is good, and there is no loosening and breaking phenomenon.
8. The joint parts of the primary end lead of the current transformer must ensure good contact and sufficient contact area to prevent poor contact and overheating.