Synchronising units are generally meant for automatic switching of three-phase generators for parallel operation with the grid or with additional generators. In order to achieve the desired operation, few points need to be addressed like:
- The voltage of the incoming alternator must be same as the bus-bar voltage
- The frequency of the incoming alternator must be same as the frequency of bus-bar voltage
- The phase of incoming alternator voltage must be identical to the phase angle of bus-bar voltage
- The phase sequence must be identical, in case of a three-phase alternator.
Lumel SA, Poland, a Rishabh Group Company, has designed a product, which would help in monitoring the key points for synchronising system mentioned above. The product created is very much user friendly and with TFT colour graphic screen. The devices are equipped with RS485 Modbus communication port and Ethernet with in-built www server to help user interface with centralised system.
Few of the key characteristics are:
- Clear data visualisation using colour graphic display 3.5-inch TFT (separately for the Synchroscope, differential voltmeter, frequency meter).
- Range of input signals: 50…150 V or 150…400 V.
- Direct or indirect measurement through voltage transformers.
- Additional control input:
– BLK – lock synchronisation
– START – start synchronisation.
- Programmable hysteresis of voltage difference, frequency, and phase shift angle.
- Relay output for
– Sync enable (available with 300V/1A)
– Alarm output.
- Ethernet interface 10/100 BASE-T for connecting the synchronization meter to the local area network (LAN) or the global one (WAN):
– Network services: web server, Modbus TCP / IP, DHCP client;
– RS485 with MODBUS RTU protocol.
- Password protection for two accounts of Web Server user.
- Measurement of the minimum and maximum values of voltage and frequency
- External dimensions: 96 x 96 x 77mm.
For more details, visit www.rishabh.co.in
