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The difference between common current transformer and zero sequence mutual inductor and its usage?
1. the role of common current transformer
Ordinary current transformer can convert the primary current with larger value to the secondary current with smaller value through a certain ratio, which can be used for protection, measurement and other purposes. A current transformer with a ratio of 400/5 can convert the actual 400A current to the current of 5A.

The basic principle of zero sequence current protection is based on Kirchhoff's current law: the algebraic sum of complex currents flowing into any node of the circuit is equal to zero. Under the normal condition of the circuit and electrical equipment, the sum of the vectors of each phase current is equal to zero. Therefore, the secondary side winding of the zero sequence current transformer has no signal output and the executing element does not operate. When grounding fault occurs, the vector and sum of the phase currents are not zero. The fault current causes the flux to be generated in the annular core of the zero-sequence current transformer. The secondary induction voltage of the zero-sequence current transformer causes the actuator to act, drives the tripping device and switches the power supply network to achieve the purpose of grounding fault protection.

The function of 3. zero sequence mutual inductor

4. use condition of zero sequence mutual inductor

A current transformer can be installed on each of the three-phase lines, or three-phase conductors can pass through a zero-sequence current transformer together, or a zero-sequence current transformer can be installed on the neutral line N to detect the sum of the three-phase current vectors.

Zero-sequence current protection can be used to install a current transformer (C.T) on each three-phase line, or let three-phase conductors pass through a zero-sequence C.T together, or install a zero-sequence C.T on the neutral line N. These C.T can be used to detect the sum of three-phase current vectors, i.e. zero-sequence current Io, IA+IB+IC=IO, when the line is connected to a three-phase negative. When the load is completely balanced (no grounding fault, and do not consider the leakage current of the line, electrical equipment), IO = 0; when the three-phase load on the line is unbalanced, then IO = IN, the zero-sequence current is unbalanced IN; when a phase grounding fault occurs, a single-phase grounding fault current Id will inevitably occur, and then detected. The zero sequence current IO=IN+Id is the vector sum of the three-phase unbalanced current and the single-phase earth current.

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