how to print barcode in asp net c# Delta-wye connection This is the second most common connection for in Software

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Delta-wye connection This is the second most common connection for
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three-phase loads in North America, and the most common in Europe It would probably be favored for serving loads in nearly all cases if it were not for the susceptibility of the connection to ferroresonance in cable-fed systems Advantages include:
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There is less infeed into utility-side ground faults Third harmonics from the DG do not reach the utility system Some isolation from voltage sags due to utility-side SLG faults is provided
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Disadvantages include:
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It is difficult to detect some SLG faults from the secondary side by voltage relaying alone
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Distributed Generation and Power Quality Distributed Generation and Power Quality 411
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It is susceptible to ferroresonance in cable-fed installations8 Third harmonics in the DG may cause excessive current in the secondary-side neutral If islanded on an SLG fault, utility arresters can be subjected to overvoltages (see Sec 96) If arresters are islanded on an SLG fault and there is little load, resonant overvoltages can result
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The last two items are common to all transformers with an ungrounded primary connection Note that while this connection prevents third harmonics from the generator from reaching the utility system, it does not prevent their flow on the DG side (see Fig 920) As with the grounded wye-wye connection, it is generally not advisable to directly connect synchronous alternators that are not 2/3 pitch without inserting an impedance in the neutral to limit the third-harmonic current flow (Fig 925) While the phase shift can be beneficial to the load in reducing the impact of voltage sags due to SLG faults, it also makes some SLG faults on the utility system more difficult to detect This increases the chances of islanding at least briefly because it delays fault detection until the utility breaker operates Therefore, it is common to add other relaying functions to aid in the early detection of utility-side faults A negative-sequence relay can make the detection more reliable While the voltage magnitudes seen on the secondary may not change much during a fault, they will be unbalanced, resulting in detectable negative-sequence voltages and currents
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DELTA-WYE TRANSFORMER
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TRANSFORMER FUSES
Figure 925 Delta-wye transformer connection
OPTIONAL NEUTRAL REACTOR AND BYPASS SWITCH
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Distributed Generation and Power Quality 412 Nine
Another approach is to add relaying on the primary side of the transformer, such as a type 59G relay ground overvoltage that can detect the presence of the SLG fault This is an overvoltage relay placed in the corner of a broken delta potential transformer that measures zerosequence voltage
Delta-delta or ungrounded wye-delta connection While not in the majority,
these connections are still common for commercial and industrial loads Both have similar behavior with respect to serving DG Neither would be the preferred connection for serving most new DG installations, but could be encountered in legacy systems where a customer wishes to parallel DG Some inverter-based systems (fuel cells, photovoltaics, microturbines, etc) require an ungrounded connection on the DG side because the dc side of the inverter is grounded This is often accomplished by use of a separate isolation transformer rather than the main service transformer However, either of these connections would also suffice The delta secondary is sometimes a four-wire connection with one of the delta legs center-tapped and grounded to serve single-phase 120-V loads This is common in smaller commercial facilities that have three-phase HVAC equipment along with typical office load If this is the case, no part of a three-phase DG can be grounded while paralleled with the grid Advantages include:
More economical transformer installation for smaller three-phase service with some single-phase loads is possible The load is isolated from ground faults on the utility side DG would not typically feed utility-side ground faults except when resonance occurs Ungrounded interconnection can be provided for inverter-based systems requiring it
Disadvantages include:
Utility-side SLG faults are difficult to detect Utility arresters are subjected to high steady-state overvoltages if islanded on an SLG fault (see Fig 926) This is true for delta-wye connections as well These connections are highly susceptible to ferroresonance in cablefed installations There are more restrictions on switching for utility maintenance Three-phase switchgear may be required on the primary because there are several problems that can occur if one attempts to perform singlephase switching This will increase the cost of the interconnection
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