product
Ring main unit (RMU) protection
Overcurrent protection with second harmonic blocking
5 configurable passive (dry contact) digital outputs, 8 configurable active (wetted) digital inputs
Supports Modbus and IEC 60870-5-103 communication protocols
The AM2SE series protection relay integrates protection and control functions, which can meet the requirements of customers' power systems with voltage levels of 20KV and below for ensuring the safe operation and reliability of electric energy. It is currently widely used in distribution network power systems such as substations, residential power distribution, hospitals, schools, commercial plazas, and large buildings.
| Characteristics | Accuracy | Resolution | Disengaging ratio |
| Voltage | ±3% | 0.001V | 0.95 and 1.05 |
| Current | ±3% | 0.001A | 0.95 and 1.05 |
| Frequency | ±0.02Hz | 0.001Hz | - |
| Inverse Time ElementOperation delay|t>(IDMT) | 40ms or ±5% setting value | 0.001s | - |
| Time ElementOperation delay|t>(DT) | ≤40ms [delay time within 2 seconds]≤40ms ±1% setting value [delay time larger than 2 seconds] | 0.001s | - |
| Characteristics | Description/Value |
| Operating Temperature | -10℃～＋55℃ |
| Humidity | 5％～95％ (No condensation and freeze inside) |
| Altitude | ≤2500m |
| Enclosure | IP20 (local panel) |
| Characteristics | Description/Value |
| Insulation Resistance | >100MΩ, 500Vdc |
| High voltages withstand | 2kV rms AC, 1 min:between all case terminals connected together, and the case earth/ground;2 kV rms AC, 1 min:between all terminals of independent circuits |
| Impulse Voltage | ±5kV (1.2/50μs, 0.5J) |
| Characteristics | Standard | Level/Class |
| Radiated emission | IEC-60255-26:2023——5.1 | A |
| Conducted emission | IEC-60255-26:2023——5.2 | A |
| Radiated radio frequency fields | IEC-60255-26:2023 | A |
| Electrostatic discharge | IEC-60255-26:2023——6.1 | B |
| Conducted radio frequency disturbance | IEC-60255-26:2023——6.2-6.5 | A |
| Fast transient bursts | IEC-60255-26:2023——6.2-6.5 | B |
| Slow damped oscillatory waves | IEC-60255-26:2023——6.2-6.4 | B |
| Surges | IEC-60255-26:2023——6.2-6.4 | B |
| Voltage dips and short interruptions test(AC or DC) | IEC-60255-26:2023——6.2 | A/C |
| Magnetic field at power frequency | IEC-60255-26:2023——6.1 | B |
| Analogue inputs | AM2SE | ||
| V | H | ||
| Input Current | 4 | ||
| Input Voltage | 3 | ||
| Protection Functions | V | H | |
| Overcurrent (3 stages,IDMT) [ANSI 50/51] | √ | ||
| Earth fault (3 stages,IDMT) [ANSI 50N/51N] | √ | ||
| Negative sequence overcurrent (2 stages,IDMT) [ANSI 46] | √ | ||
| Auto-reclose [ANSI 79] | √ | ||
| Overload (trip/alarm) [ANSI 49F] | √ | ||
| Under frequency [ANSI 81U] | √ | ||
| Post-accelerated overcurrent | √ | ||
| I0 Post-accelerated overcurrent | √ | ||
| Overvoltage(trip) [ANSI 59] | √ | ||
| Undervoltage (trip) [ANSI 27] | √ | ||
| Self-produced over zero-voltage (trip) [ANSI 59N] | √ | ||
| Residual overvoltage (trip) [ANSI 59N] | √ | ||
| FC block [ANSI 86] | √ | ||
| Trip and close circuit supervision (alarm) [ANSI 74] | √ | ||
| Non-electricity (trip/alarm) | √ | ||
| Undervoltage (alarm) [ANSI 27] | √ | ||
| Overvoltage (alarm) [ANSI 59] | √ | ||
| Residual overvoltage (alarm) [ANSI 59N] | √ | ||
| PT supervision (alarm) | √ | ||
| Self-produced over zero-voltage (alarm) [ANSI 59N] | √ | ||
| Overhaul-lockout [ANSI 86] | √ | ||
| 2nd harmonic restraint | √ | ||
| Rear port | V | H | |
| RS485(1 port) | √ | ||
| Protocols | V | H | |
| Modbus serial | √ | ||
| IEC 60870-5-103 | √ | ||
| Measurement | V | H | |
| Electric parameter | U,I,P,Q,PF,Fr,Ep,Eq,Es | ||
| Logs and Records | V | H | |
| Fault recorder | √ | ||
| Sequence of event record | √ | ||
| Others | V | H | |
| Anti-pumping circuit | ■ | ||
| Remote control | √ | ||
Acrel is a high-tech enterprise focusing on research, production, sales and service. We mainly provide users with system solutions for energy efficiency management and electrical safety.
