Introduction
When the Protective current transformer measures the large current of alternating current, it needs to be converted into a relatively uniform current in order to facilitate the secondary instrument measurement (China stipulates that the secondary rating of the current transformer is 5A or 1A). Whether the current transformer can correctly transfer the primary current during the short-circuit transition plays a decisive role in the correct operation of the relay protection.
The Protective current transformer for protection mainly cooperates with the relay protection device and provides signals to the relay device to cut off the fault circuit when a short circuit and other faults occur on the line to protect the safety of the power system.
Scope of application
Protective current transformers are generally used in relay protection circuits traversed by multiple busbars, developed for the protection system to detect short-circuit faults, with different accuracy levels and accurate limit coefficients, which can be extended to different perforation sizes and are widely used in low-voltage distribution protection systems. It can also be used to collect low-voltage overload and short-circuit signals and use them with protection relays.
Product Features
1. Protect CT primary current 200-6300A, secondary current 5A, 1A, 0.1A, 0.05A
2. Rated working voltage AC0.66kV (equivalent AC0.69kV, GB/T156-2007)
3. Rated frequency 50/60Hz
4. The ambient temperature is -30 °C ~ 70 °C, and the maximum temperature resistance is 120 °C
5. Altitude≤ 3000m
6. Power frequency withstand voltage 3000V/1min 50Hz
7. It is used in places without direct invasion of rain and snow, without serious pollution and severe vibration
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