Schneider MiCOM P40 AGILE Series Protection Relay

Core Technical Specifications

1. Power Supply: 24–250 VDC / 85–265 VAC universal auxiliary supply
2. Rated Measurement Inputs: 1A / 5A CT secondary current; 100V VT secondary voltage
3. Operating Temperature Range: -40°C to +70°C storage; -20°C to +60°C continuous operation
4. Protection Trip Time: Minimum 8ms instantaneous overcurrent trip
5. Communication Interfaces: Modbus RTU, IEC 60870-5-103, DNP3, Ethernet TCP/IP optional expansion
6. Fault Recording Capacity: 1000 fault event logs; 50 cycle high-resolution oscillography storage
7. Digital I/O Channels: 12 binary input channels, 8 relay output contacts (5A breaking capacity)

Functional Features

• Comprehensive protection algorithms: Phase overcurrent, earth fault, negative sequence overcurrent, thermal overload, under/over voltage, loss of voltage, reverse power protection
• Adaptive AGILE logic: Automatically adjusts protection curve parameters based on real-time feeder load data to avoid nuisance tripping during motor startup or load surge
• Built-in metering: 3-phase active/reactive power, power factor, energy accumulation, harmonic distortion measurement up to 31st harmonic
• Local HMI: Backlit LCD display, physical navigation pushbuttons, LED status indicators for trip, alarm, power, communication
• Firmware upgradable via USB or Ethernet without hardware disassembly
• SIL 2 functional safety certification for critical distribution feeder applications

Application Scenarios

• Medium voltage (3.3kV ~ 33kV) industrial factory distribution feeders
• Commercial building substation main & backup feeders
• Rural utility grid overhead line and underground cable protection
• Small-scale renewable energy grid interconnection (solar/wind farm low-voltage feeder)
• Pump, fan, compressor motor feeder protection in chemical, mining and water treatment plants

Material Composition & Structural Characteristics

1. Housing Material: Flame-retardant ABS+PC alloy enclosure, UL94 V-0 fire resistance rating
2. Internal PCB: Double-sided industrial FR4 printed circuit board with tin-lead free gold-plated contact terminals
3. Front Panel: Anti-scratch tempered glass protective layer for LCD screen; silicone rubber sealed pushbuttons for dust and moisture resistance
4. Mechanical Structure: Standard 4U 19-inch rack-mount chassis; compact depth design (140mm cabinet depth compatible); fully sealed internal module compartment to prevent dust ingress

Working Principle

Installation Requirements

1. Mounting Standard: 19-inch standard cabinet rack mounting, 4U vertical unit occupation
2. Wiring Specifications: CT secondary wiring uses 2.5mm² shielded copper cable; VT and control signal wiring uses 1.5mm² twisted pair cable; all cable shielding grounded single-point at relay terminal block
3. Cabinet Environment Control: Ambient humidity must maintain 5%–95% non-condensing; avoid installation within 1m of high heat-generating components such as power transformers or contactors
4. Clearance Standard: Minimum 50mm ventilation gap above and below the relay chassis for passive heat dissipation
5. Earth Connection: Reliable PE protective earth wire connection to chassis ground terminal, copper wire cross-section minimum 4mm²

Operation & Maintenance Precautions

• Strictly isolate CT secondary circuits; never disconnect CT wiring while the feeder is live to prevent dangerous high open-circuit voltage generation
• All protection curve and threshold parameter modifications require a lockable access password to avoid unauthorized configuration changes
• Regularly clean front panel LCD and pushbuttons with dry anti-static microfiber cloth; prohibited to use alcohol, acetone or corrosive cleaning solvents
• Perform annual insulation resistance testing of internal wiring; discontinue operation if insulation resistance falls below 100MΩ
• Avoid physical impact or vibration during live operation; relay internal signal processing chips are sensitive to mechanical shock