Best Choices
2.
OVERVIEW OF CON EDISON SYSTEM AND LIC NETWORK 2.1. Electrical System Overview 2.1.1. Power Delivery System
Con Edison delivers electricity to 3.2 million customers in New York City and Westchester County – a service territory of 660 square miles with a population of approximately 9 million people. Electricity is delivered through approximately 94,000 miles of underground cable and almost 37,000 miles of overhead cable. As shown in Figure 2-1, the Con Edison electric power delivery system is comprised of three distinct sub-systems: generation, transmission, and distribution.
School
Connection to Other Systems/Utilities Generating Station
Apartment House
Transmission Substation
265 / 460 Volt Network Transformers
Commercial
120 / 208 Volt Network
Distribution Feeders
Hospital
Financial
Area Substation
Overhead Transformer
Network Customers
Residential and light commercial customers 4kV Unit Substation
Figure 2-1: The Power Delivery System
2-1
Central power plants1 generate electricity that is transmitted over high-voltage transmission lines (69,000, 138,000, and 345,000 volts) that have the capability of delivering electricity over long distances.2 These transmission lines supply the distribution substations – known as area substations – where the voltage is reduced to primary distribution levels of 27 kV for Brooklyn and Queens, 33 kV and 13 kV for Staten Island, and 13 kV for Manhattan, the Bronx, and Westchester County. From the area substations, high-voltage primary feeders distribute the power and feed a secondary system of low-voltage cables. In Figure 2-1, two different types of distribution systems (network and overhead) are shown. One type of secondary system is the underground network system in which each feeder supplies transformers located throughout local streets. These network transformers reduce the primary distribution voltage to a level used by customers. The network transformers supply a network grid of low-voltage (120-volt)
OVERVIEW OF CON EDISON SYSTEM AND LIC NETWORK 2.1. Electrical System Overview 2.1.1. Power Delivery System
Con Edison delivers electricity to 3.2 million customers in New York City and Westchester County – a service territory of 660 square miles with a population of approximately 9 million people. Electricity is delivered through approximately 94,000 miles of underground cable and almost 37,000 miles of overhead cable. As shown in Figure 2-1, the Con Edison electric power delivery system is comprised of three distinct sub-systems: generation, transmission, and distribution.
School
Connection to Other Systems/Utilities Generating Station
Apartment House
Transmission Substation
265 / 460 Volt Network Transformers
Commercial
120 / 208 Volt Network
Distribution Feeders
Hospital
Financial
Area Substation
Overhead Transformer
Network Customers
Residential and light commercial customers 4kV Unit Substation
Figure 2-1: The Power Delivery System
2-1
Central power plants1 generate electricity that is transmitted over high-voltage transmission lines (69,000, 138,000, and 345,000 volts) that have the capability of delivering electricity over long distances.2 These transmission lines supply the distribution substations – known as area substations – where the voltage is reduced to primary distribution levels of 27 kV for Brooklyn and Queens, 33 kV and 13 kV for Staten Island, and 13 kV for Manhattan, the Bronx, and Westchester County. From the area substations, high-voltage primary feeders distribute the power and feed a secondary system of low-voltage cables. In Figure 2-1, two different types of distribution systems (network and overhead) are shown. One type of secondary system is the underground network system in which each feeder supplies transformers located throughout local streets. These network transformers reduce the primary distribution voltage to a level used by customers. The network transformers supply a network grid of low-voltage (120-volt)