Process data – Generate – Log parameters

The MCU continuously and accurately measures and calculates a wide range of grid condition data including:

  • busbar min / max / averaged voltages
  • minimum, maximum and RMS current and phase for individual phases per feeder
  • active and reactive powers per feeder
  • stores 1Hz raw measurement samples for a period of seven days and calculated values for up to 180 days.

The MCU has GSM/GPRS modem as standard but also features an auxiliary port that can be connected via optional network interface modules to provide customised interface solutions, providing a highly flexible means to connect to the GridKey data system or the customer’s own data systems.

Download GridKey MCU Brochure

The MCU is fully configurable at installation time via a standard IEC optical probe with a laptop or PDA. Parameters that can be set include:

  • substation identification and location information
  • the feeder connections used
  • the reporting intervals and alert message settings
  • measurement parameters.

At any point in operation, the data reporting and alert messaging settings for each MCU can be individually re-configured via its network interface. The operator can select the MCU measurement reporting interval from every minute, hour, day or week as needed. Any stored data, including detailed raw measurement data can be retrieved, for instance if detailed analysis of a specified timed event or period is required.


The GridKey LV Monitoring System is a designed for purpose, flexible and highly configurable
information system providing the following benefits:

Smart Sensor Close Up

GridKey is a custom designed continuous monitoring system for low voltage (LV) networks. It consists of a number of sensors on each feeder, connected to a Metrology and Communications Unit (MCU) which processes the sensor data and generates and logs substation loading and condition parameters. This information is relayed to a network control centre where the substation condition can be accessed graphically via our customer web portal or incorporated into the operator’s own data networks and SCADA systems.

Choose to configure and generate alert messages that would be sent via the data network system for multiple grid measurement states, for example to provide indications and warnings of any under voltage or power phase imbalance conditions. The information and alerts provided enable network managers to make evidence based decisions and plan effectively for future preventive maintenance and capital expenditure.