Edge Zero - Model eSensor - Transformer Monitor
The eSensor Transformer Monitor is a compact distribution monitoring device for grid intelligence and transformer asset management. It is an intelligent, software-driven technology that provides monitoring of a wide range of power quality metrics, power quality alarms and transformer management capabilities, all guaranteed for 15 years of asset life.
- Monitors and Transmits Grid provide 60 second data transmission rate of power quality data set
- Events Logging from 10-30 days – Store and Forward. Last gasp feature supports reporting through power outage conditions
- Real time outage and network fault state event alerts with full alarms including – Power Outages and Recovery upon re-initialization
- Supports pole top and pad mounting, suitable for both Single and Three Phase Installations with wide voltage input – 100-525VAC
- High Temperature Polycarbonate IP66 enclosure suitable for overloading, overvoltage, undervoltage, PF min., reverse current
- Remote Firmware Upload to add upgrade Custom Options and modify Alarm Limits. Data Communication module – 4G / 4G Cat M1 / LoRaWAN
- Encryption AES 256 over private APN with quick install Utility Grade Rogowski Current Transformers
- REST API, MQTT, DNP3, LV analytics, Live Grid state mapping of LV network
Available configurations
- 1 phase, 2 wire configurations
- 2 phase, 3 wire configurations
- 3 phase, 4 wire configurations
Electrical frequency
- 50/60 Hz
Rated voltage
- 100 - 300 VAC line - neutral
- 173 - 520 VAC 4-wire/3 phase network line (line - line)
Current full scale range
- 2000 Amps RMS with auto-range function
- 4000 Amps RMS with auto-range function
- 8000 Amps RMS with auto-range function
Lightning strike
- Power line surge protected to 10KV per IEC61000-4-5
Voltage accuracy
- ± 0.5%
Power & Energy Accuracy
- ± 1% + 0.1% of current full scale (2kA, 4kA, 8kA variants)
Power Factor Accuracy
- ± 1 degree
Power Quality Measurements
- Voltage, current, power, energy, vTHD, ITHD, individual harmonies up to 21st order
Reporting Interval
- 1min transmit time, 4GB memory allocated for 1 min data logging
Temperature Measurement Accuracy
- ± 1 degree
‘Last Gap’ Hold-up Time
- 30 seconds
Power Quality Alert
Power outage, power restore Current imbalance, maximum iHTD, reverse current flow, low power factor Voltage imbalance, maximum vTHD, over-voltage, under-voltage, voltage swell, voltage sag, voltage flicker Over-frequency, under-frequency
Transformer Asset Management
Overload (power), peak demand alert, over-current, fault current reading, no current reading No voltage reading In development - transformer overheating temperature alert (hotspot & top-oil), transformer overheating temperature limit (hotspot & top-oil), end-of-life warning Device tampering, communication alarm, watchdog alarm
Measured Parameters
V, I, PF, kW, kVA, kVAr, Energy, vTHD, iTHD, V/I harmonics (up to 21st), T unit internal, T transformer top oil (in development), T transformer hotspot (in development)
Communication Options
Cellular communications with embedded 3G / 4G / CAT-M1 modem, private APN with AES128 & SHA256 encryption IPSec tunnel
Communications Architecture
Periodic reporting to a central IoT cloud server On demand reporting to a SCADA system
IoT Communications
Push notifications on alerts CoAP with DTLS security
SCADA Communications
DNP3 with TLS security
Systems Logs
Fully configurable measurement interval, 4GB memory allocated to data logging