Balta Switching Surge Study

MHI was contracted by Otter Tail Power Co. to perform a Switching Surge Study on the Balta 230 kV Station.

Manitoba Hydro International Ltd. (MHI) provided the following services:

• Calculated maximum line-to-ground and phase-to-phase over-voltage data to which nearby radial-fed transformers may be subjected.
• Determined the expected energy absorption requirements of 230 kV lightning arresters for worst case capacitor energization at Balta.
• Determined an appropriate inrush/out-rush reactor design for the new shunt capacitor banks at Balta.
• Determined if there is any possibility of voltage magnification on nearby capacitor banks as a result of adding the Balta capacitors.
• Confirmed suitability of existing circuit breaker ratings at reconnected sub-stations.