Electrical & Natural Gas
Northwestern Energy (1-800-467-2669) supplies 480 VAC, 3-phase electrical power to the Glasgow WTP. A one-line diagram (Record Drawing E-11) has been provided. Standby power generation has been provided to supply electrical power during interruption of the normal power supply. The normal and standby electrical power sources serve the plant’s loads via a system of motor control centers (MCC’s), step-down transformers, and electrical panels.
The generator is located outside on the east side of the Water Treatment Plant Building. The generation equipment consists of a 300 kW, natural gas generator. The engine is equipped with a 24-volt battery driven starter. Highland Booster Pump Station is equipped with a 200 kW, natural gas generator with a 24-volt battery driven starter.
Each automatic transfer switch consists of a power transfer module and a control module. They transfer power to either the “normal” or “standby” position. A three-position (TEST, AUTO, OFF) manual switch on the automatic transfer switch controls the operation of the standby generator. In AUTO mode, the engine starts the engine when contacts in a remote-control circuit close and stops five minutes after the contacts open. The engine cannot start in OFF mode, which is also an emergency shutdown. TEST mode manually starts the generator and transfers the load to the emergency system. The switch must be turned to AUTO to retransfer the load to normal power.
Natural gas is provided by Montana-Dakota Utilities (1-800-638-3278). Natural gas is also used to power some of the heating systems.