Page 37 - North American Clean Energy May June 2018 Issue

Figure 5: Voltage drop at the generator terminals subjected to an External Fault.
e result of these simulations shows that
this rapid impedance change, made by the combined circuit breaker and high-speed grounding switch (VDH/GSMI) as a feeder breaker, can help design engineers provide PRC- 024-2’s required functionality and protection systems by making it easier to di erentiate between Internal and External Faults.
is special feeder breaker signals the generators that the fault is inside the plant,
and shuts them down when under-voltage
ride through is not necessary. is provides a valuable discriminatory function that regular MV circuit breakers do not.
e balanced three-phases short to ground, caused by VDH/GSMI, dropping voltage to zero at that point, should be treated as a shutdown signal. is signal starts at the substation,
and goes through the power cables to all the generators of the collection circuit - faster and safer than any other means - and gets to all of the connected generators at the same time.
By measuring voltage at generator terminals, it’s possible to identify a fault outside the plant and keep generating power, while complying with PRC-024-2.
Augusto X. Morando is a Sales Engineer at EMA Electromechanics. EMA was founded in 1952 in Buenos Aires Argentina, supplying low, medium and high voltage apparatus to major utility companies throughout Latin America. Product innovation and continuous growth in the electrical market led to EMA’s expansion into the North American market.
EMA Electromechanics
www.emaelectromechanics.com
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Figure 6: Voltage drop measured at the terminals of the Generator, caused by the fast action of VDH/GSMI after clearing the fault.
Figure 7: Comparative of voltage drop at the generator terminals – Amplified overlap of Figure 5 and 6.
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North American Clean Energy
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