– OVERVIEW –
Advanced Cable Network Protection for 5-38kV Distribution Systems
The SCF-EW-4 Wall Mounted Fault Indicator delivers comprehensive monitoring and fault location capabilities for underground cable distribution networks operating at 5-38kV. This intelligent device provides real-time detection of earth faults and short-circuits, ensuring rapid identification and isolation of network faults to minimize downtime and enhance system reliability.
– FEATURE AND BENEFIT –
Multi-Fault Detection Indicator
Uses Rogowski coil sensors to detect earth faults and phase short circuits with bright LED indicators. Short-circuit threshold: 200A-1000A, earth-fault: 40A-160A, delay: 40-200ms. Features RS485 MODBUS RTU, dual relays, and digital input. Powered by internal AA lithium battery 3.6V/2.7Ah with optional external 5-36VDC supply and low battery alarm.
Applications
The SCF-EW-4 is ideally suited for underground cable networks across urban distribution systems, industrial power networks, commercial electrical installations, renewable energy distribution networks, and critical infrastructure monitoring applications where reliable fault detection and rapid response are essential for maintaining power system stability and minimizing downtime. The device’s robust construction and comprehensive communication capabilities make it particularly valuable in environments requiring integration with existing SCADA systems and automated fault management protocols.
– TECHNICAL SPECIFICATIONS –
| Parameter | Specification | Details |
|---|---|---|
| DETECTION PARAMETERS | ||
| Short-circuit Trip Current | 200A/600A/800A/1000A | Default: 200A (±5%), Adjustable by DIP switch |
| Short-circuit Response Delay | 40ms/80ms/100ms/200ms | Default: 40ms, Adjustable by DIP switch |
| Earth-fault Trip Current | 40A/80A/120A/160A | Default: 40A (±5%), Adjustable by DIP switch |
| Earth-fault Response Delay | 40ms/80ms/100ms/200ms | Default: 40ms, Adjustable by DIP switch |
| SENSOR SPECIFICATIONS | ||
| Short-circuit Sensors | 3 pieces | Rogowski Coil Sensors, 2m cable length |
| Short-circuit Sensor Diameter | Max. 80mm | Cable clamp-on design |
| Earth-fault Sensor | 1 piece | Rogowski Coil Sensor, 2m cable length |
| Earth-fault Sensor Diameter | Max. 110mm | Cable clamp-on design |
| PHYSICAL DIMENSIONS | ||
| Display Unit Size | 100mm × 120mm × 45mm | Wall-mounted, excluding cable glands |
| Installation Type | Wall-mounted | Display unit only |
| Weight | – | Lightweight design |
| ENVIRONMENTAL CONDITIONS | ||
| Operating Temperature | -40°C to +70°C | Full operational range |
| Protection Rating – Display | IP54 | Dust and water resistant |
| Protection Rating – Sensors | IP68 | Fully waterproof |
| Internal Type Test | IEEE 495-2007 | Compliance standard |
| POWER SUPPLY | ||
| Internal Battery | Lithium AA 3.6V / 2.7Ah | Primary power source |
| External DC Supply | 5-36VDC | Optional power input |
| Battery Protection | Separate battery switch | Built-in protection |
| Low Battery Alarm | Yellow LED indication | Visual warning |
| INDICATION SYSTEM | ||
| Earth-fault Indication | 1 Red LED | Ultra-bright blinking |
| Short-circuit Indication | 3 Red LEDs (L1, L2, L3) | Phase-specific indication |
| Low Battery Indication | 1 Yellow LED | Ultra-bright blinking |
| COMMUNICATION INTERFACE | ||
| Communication Protocol | MODBUS RTU | Industry standard |
| Physical Interface | RS485 | 2-wire communication |
| Data Configuration | 8 data bits, 1 stop bit, no parity | Standard configuration |
| Baud Rate | 9600 bps | Fixed rate |
| INPUT/OUTPUT SPECIFICATIONS | ||
| Relay Outputs | 2 relays | Max. 250VAC/30VDC/5A |
| Digital Output 1 | Earth fault/Short circuit alarm | Normally Open (NO) |
| Digital Output 2 | Low battery alarm | NO or NC selectable |
| Digital Input | Remote reset capability | 9-38VDC input |
| External LED Connection | Available | For remote indication |
| RESET OPTIONS | ||
| Manual Reset | Push button | 3-second press required |
| Timing Reset | 2min/12h/24h/48h | Adjustable by DIP switch |
| Remote Digital Reset | 9-38VDC via SCADA | Digital input activated |
| Load Current Reset | Minimum 10A recovery | Automatic for permanent faults |
| AC Voltage Reset | 220-240VAC recovery | Automatic for permanent faults |
| MODBUS Reset | Communication protocol | Remote reset capability |
| CONNECTOR ASSIGNMENTS | ||
| Connector 1-2 | Short-circuit sensors | Reserved port |
| Connector 3-5 | Short-circuit fault sensor | Common terminal |
| Connector 6 | Earth-fault sensor | Single sensor input |
| Connector 7-8 | External LED lights | Remote indication |
| Connector 9-10 | DO 1 relay output | Fault alarm output |
| Connector 11-12 | DO 2 relay output | Low battery alarm |
| Connector 13-14 | RS485 communication | A=RS485+, B=RS485- |
| Connector 15-16-17 | Digital input | DC 9-38V, DI=positive, GND=negative |
| Connector 18-19 | DC power supply | 5-36V, VIN=positive, GND=negative |
| Connector 20-21 | External reset | AC 220V-240V |
| Connector 22-23 | – | Future expansion |
| ORDERING OPTIONS | ||
| Cable Length | 2 meters (default) | Customizable upon request |
| Sensor Diameter | 110mm & 80mm (default) | Customizable upon request |
| DC Adapter | Optional | Required for communication function |