External Switch Type Three-Phase Electric Meter Sensor (for IoT and AC use) refers to the TFYS-CSB-WZ1 series Tunneling Magnetoresistance (TMR) current sensors developed by Ningbo Taifengyuan. Custom-designed for national grid IoT three-phase AC electric meters in China, they adopt an external switch structure. Featuring a primary rated current of 10A and a maximum current of 80A, these sensors achieve an accuracy of ±0.2% and a linearity of less than 0.1%, with a bandwidth exceeding 100kHz (-3dB) and a response time of merely 1 microsecond. Capable of stable operation within an ambient temperature range from -40℃ to 85℃, they serve as a reliable solution for current monitoring of smart electric meters.
Symbol | Name | Parameter |
pn | Primary Rated Current | 10A |
Imax | Maximum Current | 100A |
IM | Secondary Rated Current | 4mA |
KN | Transformation Ratio | 1:2500 |
X | Accuracy (Ta=25°C) | ±0.2% |
L | Linearity | <0.1% |
di/dt | Follow Accuracy | >100A/μs |
Ioff | Offset Current | ±0.3mA |
BW | Bandwidth | >100kHz (-3dB) |
t | Response Time | 1μs |
Vc | Supply Voltage | ±5V (±5%) |
Ic | Current Consumption | 2.0mADC+I/KN |
ta | Operating Temperature | -40°C ~ 85°C |
ts | Storage Temperature | -55°C ~ 100°C |
