Scope: Application for a Utility Service Provider that will deploy the Majortel DC-to-DC converter in a 250V dc nominal power, substation environment. This procedure is intended to be performed by qualified personnel familiar with general dc electrical system knowledge and maintenance protocols. Multiple 130V to 24 and 130V to 48 converters are deployed across the nation, this is one of a select few that operate with a higher voltage bus. #SmartGrid #Grid Modernization
Assume: The battery system will likely be a 116 cell installation, therefore the operation range could be:
1) Low voltage 1.75 v/p/c * 116 = 203V
2) High voltage 2.3 v/p/c * 116 = 266.8
Battery installations vary by application. Consult the battery design parameters for definitive operation range.
a) The input current is 8.4A @ 203V maximum per power module.
b) Worst case calculation is a 20A / 203V dc input rated circuit?
8.4 x 2 = 16.8A per full system. 16.8/.85% = 19.76A input; rounding up to a 20A dc source, protected branch circuit
c) Users shall adjust the Alarm Threshold parameters in the system MTS-Com unit when deployed in a 250V dc environment. Make adjustments for the installation operational requirements by using the parameter setting procedure below. Potentially set the low voltage trigger to 193 (1.67 v/pc) and the high voltage trigger to 284 (2.45 v/pc).
d) The converter will shutdown and auto recover if dc source voltage exceeds the 300V rating. No damage and auto-recovery are module features. With an “Input Over Voltage” rating of 300V dc, no damage occurs because the rated voltage of key internal components is 450V dc.
+ The voltage OFF trigger is X = 300V dc
++ Hysteresis for recovery is X – 10V = 290V dc
Parameter Setting to Commission System:
* application note applies to these models
(equipment design intent does not include crane and HVAC applications)