Protection Relay, AM4

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Protection Relay, AM4

AM4 series microcomputer protection device is applicable to the user substation which the input voltage is 35kv or above. AM4 protection relay can be used to protect and control the user substation, and is widely used in power industry, water conservancy industry, traffic industry, oil industry, chemical industry, coal industry, metallurgical industry and so on.

Functions

Application Type Function	Current type	Voltage type
Application Type Function	AM4-I	AM4-U1
Input Current	4	0
Input voltage	4	4
Digital input DI	12	12
Digital output DO	5	5
Protective Function
Over current protection (three stage, inverse time )	√
Over zero-current protection (two stage, inverse time)	√
Negative sequence over-current (two stage, inverse time)	√
Reclose	√
Overload trip/alarm	√
Low-frequency load shedding	√
After accelerating over-current	√
Over voltage trip	√
Under voltage trip	√
FC Block	√
Control circuit fault alarm	√
Non electric trip/alarm	√
Under voltage alarm	√	√
Over voltage alarm	√	√
Over zero-voltage alarm	√	√
PT disconnection alarm	√	√
Self-produced over zero-voltage alarm		√
Communication protocol
ModBus-RTU	√	√
IEC60870-5-103	√	√
Accessibility
Fault recording	√

Note: √ represents that the function is available, ■ represents that the function is optional, blank represents that the function is unavailable.