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 |
| 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.
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