Lighting and Electricity Quiz 4 UC

Generation

Convert another form of energy into electrical energy

Transmission

Transports large amounts of electrical power over long distances.

Distribution

Deliver electricity to individual buildings

Solar Photovoltaics

Converts sunlight directly into

electricity using semiconductor materials.

Concentrated Solar Power

Uses parabolic mirrors that follow the sun (called heliostats) and focus the solar energy to a central collector. This collector heats a medium, which then turns a turbine connected to a generator.

Step down transformer

A step-up transformer lowers the voltage before the power enters the transmission network.

Step Up Transformers

A step-up transformer raises the voltage before the power enters the transmission network.

Circuit Breaker

Interrupt current under specified operating and fault conditions.

Disconnect Switches

Provide isolation of equipment; they generally are not intended to interrupt fault current.

Busbars

Common conductive connections joining

circuits and equipment. Metal bar

Protective relays

Monitor electrical quantities and command circuit breakers to operate when abnormal conditions are detected

Instrument transformers

Current transformers (CTs) and voltage transformers (VTs) provide scaled signals for metering and protection

Capacitor banks and reactors

Help manage reactive power and voltage.

A typical transformer used in a building is rated in

kVA

Isolation Transformer

Provides galvanic isolation between the primary and secondary circuits to protect users from electric shock and suppress electrical noise

L1 or L2

Underground (hot) conductor

Neutral

Center-tap conductor

Two-pole Breaker

Connects 240V Loads

Single-pole Breaker

Connects 120V loads

Wye Configuration

One end of each phase winding connects to a common point called the neutral point. The other end connects to a line conductor. Voltage splits

Delta Configuration

the three phase windings connect end-to-end to form a closed loop. The line conductors connect at the three

junctions. Current splits

Service Disconnect

Disconnects the building's electrical installation from the utility supply.

Main overcurrent protection

Protects the service conductors and equipment as required.

Fuse

Opens the circuit when its internal elements melt in response to sufficient current over time.

Ground Fault

Occurs when an energized conductor makes an unintended electrical connection to grounded metal or another grounded part

Grounding

Connects the electrical system to earth.

Bonding

Connects conductive parts together.

The NEC article that covers grounding and bonding is NEC

250

Which is not a part of a typical grounding system?

Incoming gas service

What typically handles the most current in a system?

Switchboard