- #PARALLELS GENERATOR GENERATOR#
- #PARALLELS GENERATOR CODE#
For medium-voltage breakers, relaying systems normally are employed to provide the necessary protective measures for all breakers (see Figure 2).
#PARALLELS GENERATOR GENERATOR#
Utility and generator circuits require a more sophisticated protection scheme than low-voltage circuit breakers with integral trip units can provide therefore, breakers with separate multifunction protective relays are provided.
Low-voltage circuit breakers with built-in trip units provide the protection necessary for low-voltage feeder circuits. Protection: The protection requirements for PSG depend on the size of the generators, system voltage, and the required level of system reliability. These could be the load-bus tie or generator-bus tie breakers.
Tie breakers-breakers between similar source breakers. Load feeder/distribution breakers-breakers that directly feed loads or transfer switches. Generator main breaker-breakers that tie the generator bus to the load bus and are used for transfer between the two sources (generator source or utility source). Generator breakers-breakers directly fed from the generator source. Utility main breakers-breakers directly fed from the utility source. Paralleling system breakers: Regardless of the layout of the switchgear, the following are used to label basic breaker compartment requirements for parallel switchgear application: System operators spend most of their time near control compartments therefore, the recommended approach is to locate the controls compartments outside the arc flash boundary of the breaker compartments. The latter is preferred to lower the arc flash hazard risk category. These can be integrated into one lineup or installed in separate enclosures. PSG consists of breaker compartments and control compartments (see Figure 1). The equivalent Canadian standard for all the above is CSA C22.2 No. ANSI/IEEE C37.20.2-1999: IEEE Standard for Metal-Clad Switchgear for metal-clad and station-type cubicle switchgear. UL 1558-2016: Standard for Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear and ANSI/IEEE C37.20.1 for metal-enclosed low-voltage power circuit breaker switchgear. UL 891-2005: Switchboards for dead-front switchboards. The applicable standards depend on the voltage and type of construction. The systems can be of switchboard construction, metal-enclosed construction, or metal-clad construction. The voltage selected is a function of system capacity, standard voltages for the region, and utility voltages. Business-critical systems, also referred to as optional standby systems. 
Critical operations power systems (COPS). Paralleling switchgear (PSG) is a combination of protection, metering, control, and switching elements acting as an integrated system to control the distribution of power for the following systems: Also, two existing parallel generator systems will be presented and their paralleling elements highlighted.Īs defined in Part 1, “Paralleling generator systems,” in the December 2016 issue of Pure Power, paralleling is the operation in which multiple power sources, usually two or more generators, are synchronized and then connected to a common bus. Part 3: Installation considerations, interconnection with the utility, and generator sizing. 
Part 2: Paralleling switchgear, their components, and common paralleling modes.
#PARALLELS GENERATOR CODE#
Part 1: The need for backup power, code requirements, why diesel is preferred, generator ratings, and the benefit of paralleling generator systems.
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