SMART METERING TOOL (SMT)
Outdoor smart metering system for overhead medium voltage lines
Smart Meter Tool (SMT) is an innovative metering and billing system that measures real-time energy consumption on overhead power lines at nominal voltage up to 10kv. The system consists of an array of high-precision non-conventional voltage and current sensors and the central unit SCP (System Central Processing Unit), which processes the acquired signals and provides all the dimensions needed to monitor the basic parameters of the line. The SCP unit is powered by the sensors themselves, which - through capacitive coupling with the MT line - also provide the necessary energy to operate the entire system.
Benefits
split core CT/VT integrated transducer with power harvesting feature
different available communication interfaces to transmit collected data
Features
- Unconventional current and voltage sensors with “energy harvesting” functionality for the entire system’s power supply
- Precision class 0.5s (active energy) allowing tax measures to be developed for invoicing purposes
- Central unit (SCP) equipped with wireless communication interfaces (GSM/GPRS modem, WiFi, GPS/GLONASS)
Technical Specifications
| Line voltage | 10 Kv +/- 20% min, 2 phases |
| Operating current | 0-75 A – 0-750 A, (+20%) |
| Operating temperature | - 40° C to +70° C |
| Grid frequency | 50 Hz (+/- 10%) |
| Макс. мощность, поглощаемая линией Ср.Напр. | < 5 W |
MEASUREMENTS
| Active Energy | Class 0.5S |
| Reactive Energy | Class 1 |
| Voltage | < 0.5% |
| Current | < 0.5% |
| Частота | +/- 0.01 Hz |
| Load curve integration period (PI) | 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 min (programmable) |
| Load curve | 124 days with PI = 30 min |
COMMUNICATION
| GSM/GPRS | 3GPP standard, rel. 4, Dual SIM |
| Protocol | DLMS, Access to 2 levels with password/MODBUS IPP |
| WiFi | IEEE 802.11 b,g,n. Access point with programmable WEP password, DHCP server |
| GPS/GLONASS | RTC and geolocal auto-sync |
| USB | USB2, DCE Emulation |
| Display on user side | 7” handheld display, instantaneous display of measurements and load profiles in Wi-Fi connection with integrated web server |