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  • Zero sequence current transformer
  • Zero sequence current transformer
Zero sequence current transformer
Zero sequence current transformer

Zero sequence current transformer 0.5KV Low voltage indoor single phase residual current transformer

Model: LXK-120

Description

Items used in the power industry. Zero sequence current transformer is a single turn through the heart type current transformer, generally used for power protection equipment such as: small current grounding selector, microcomputer detuning device and other supporting use
  • General
  • Protection Principle
  • Technical data
  • Drawing

Zero-sequence current transformers are used in conjunction with relay protection devices or signals when zero-sequence ground currents are generated in the power system, so that the device components act to achieve protection or monitoring.

Model Meaning

CT Model Meaning

The specific application of zero sequence current protection can be installed in each of the three phase lines a current transformer (CT), or let the three phase conductors together through a zero sequence CT, can also be installed on the neutral N a zero sequence CT, the use of these C.T to detect the three phase current vector and, that is, zero sequence current Io, IA + IB + IC = Io, when the three phase load connected to the line is completely balanced (no ground fault, and do not consider Line, electrical equipment leakage current), Io = 0; when the line connected to the three-phase load is unbalanced, then Io = IN, when the zero sequence current for the unbalance current IN; when a phase ground fault occurs, must produce a single-phase ground fault current Id, when the detected zero sequence current IO = IN + Id, is a three-phase unbalance current and single-phase ground current vector sum.

 

LXK-φ(80, 120, 140, 160, 180, 200, 240, 300)type technical data 1: for residual protection

Transformation ratio (A) Relay type Connection type of relay coil Relay scale value Primary residual current of relay acting (A) Weight(kg)
60/1 DD-11/60 Series connection 15×1 2.4-4.5 4.5
30×1
Parallel connection 15×2 3-5
30×2
DD-1/60 Series connection 15×1 3-5
30×1
Parallel connection 15×2 3-6
30×2

LXK-φ(80, 120, 140, 160, 180, 200, 240, 300) type technical data 2: mating with microcomputer protection

Transformation ratio (A) Accuracy class Ratde output (VA)
60/1 5P10 1.0
75/1 1.5
100/1 2.5
150/1 2.5
200/1 3.75
300/1 7.5
150/1 2.0
200/1 2.5
300/1 5.0
400/1 10.0
500/1 12.5
600/1 15.0

 

CT-LYK drawing

Type ΦD ΦD1 H H1 L Φ
LXK-Φ80 165 80 185 85 150 7
LXK-Φ120 205 120 224 104 150 7
LXK-Φ140 225 140 244 114 160 9
LXK-Φ160 243 160 262 123 160 9
LXK-Φ180 285 180 310 147
LXK-Φ200 320 200 339 162
LXK-Φ240 383 245 460 248 280
LXK-Φ300 430 305 520 293 350

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