The reason of the current transformer need to be short-circuited
The specific analysis is as follows:
1. Prevent high voltage hazards
High voltage risk: At this time, the secondary side will induce extremely high voltage (up to thousands of volts), which may break through the insulation layer, cause equipment damage, arc discharge, and even endanger personnel safety.
2. Safe operation specifications
Permanent protection: In some CT designs, the secondary side is equipped with a short-circuit switch or terminal to automatically maintain a short circuit when not in use.
3. Comparison of voltage transformer (PT)
Differences between current and voltage transformer:
CT: connected in series with the circuit, the secondary side needs to be connected to a low impedance load (such as an ammeter, relay). Open circuit leads to high voltage.
PT: connected in parallel with the circuit, the secondary side needs to be connected to a high impedance load (such as a voltmeter). Short circuit leads to high current and may burn the equipment.
4. Precautions in engineering practice
Load matching: The secondary side of the CT in operation must be connected to a matching load (such as a 1A or 5A meter), and no load is prohibited.
LVZW-35 current transformer produced by Shaanxi West Power Tongzhong Electrical Co., Ltd. is a sensor used to measure large current in 35kV system. It is mainly used in substations, power systems and electrical equipment. The transformer adopts magnetic core type, which is characterized by high linearity, strong anti-interference ability, small size and simple structure. It is a current transformer with very high cost performance.
LVZW-35 current transformer offers numerous advantages:
1.Safe and reliable
Electrical isolation: The current transformer can effectively isolate the primary circuit of high voltage and high current from the secondary measurement and protection circuit of low voltage and low current, avoiding direct contact of operators with high voltage current, greatly reducing the risk of electric shock, and ensuring the safety of personnel.
Strong anti-interference: Its working principle is based on electromagnetic induction, which will not affect and interfere with the measured circuit, ensuring the accuracy and reliability of the measurement results, and can work stably in a complex electrical environment, providing a strong guarantee for the safe operation of the power system.
2.High measurement accuracy
The output signal accuracy can reach 0.5, 0.2 or even higher, which can meet the application occasions with high requirements for current signal accuracy. Whether in the normal operation state of the power system or in the transient process when a fault occurs, the current can be accurately measured to provide accurate data support for relay protection, metering, monitoring, etc.
3.Wide measurement range
It can be applied to different voltage and current levels, and can meet the needs of various power systems and industrial application scenarios. Modern current transformers usually have a multi-speed adjustable measurement range. By adjusting the transformer ratio, it can adapt to current measurements of different sizes, and has strong versatility and flexibility.
Should you have any requirements in these fields, please feel free to contact us as per following information:
Email: xdtz04@westpowerelectric.com
Website: https://www.xdtzelectrical.com/
Tel:+86 917 3661109
Mobile phone(whatsapp ): +86 18091765882
