Category Archive for: «Medium Voltage»

3 Common Misconceptions Regarding Automatic Transfer Systems

Automatic transfer systems Several common misconceptions regarding automatic transfer systems exist. Three of these are addressed here // I need a complex automatic transfer scheme at every voltage level AC Control Power for my automatic transfer PLC can be handled by the system UPS’s Since my automatic transfer system was tested in the factory, it doesn’t […]

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Electrical Distribution Architecture In Water Treatment Plants

Water treatment plants For both drinking water and wastewater treatment, 4 different sizes of plants have been distinguished. The size of plants can be expressed in quantity of treated water per day, or in corresponding number of inhabitants. Four different types of (waste) water treatment plants have been distinguished, depending on destination and size: T1 – […]

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Distribution of the MV neutral conductor right to the loads

MV distributed neutral conductor 4-wire systems are characterized by distribution of the MV neutral conductor right to the loads. This type of distribution is used in the USA and in certain countries influenced by North America, and is always subject to ANSI regulations. It is only used in a “directly earthed” neutral plan, and applies […]

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Basics Of Primary Medium Voltage Switchgear

Primary medium voltage switchgear Primary medium voltage switchgear represents an important part within the primary distribution substation functionality. The switchgear works as a connection node between the outgoing distribution feeders and the in-feeding power transformers. The most common construction with the switchgear is an indoor-mounted metal-enclosed one. The rated voltage, current and short circuit withstand […]

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Power plants on board of big ships – Primary distribution schemes

Continued from the first part Power plants on board of big ships – LV/MV ditribution MV primary distribution network The MV primary distribution network generally consists in a three-phase system with three conductors without neutral. Such system is usually managed with the neutral of the star point isolated from earth or connected with earth through […]

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Power plants on board of big ships – LV/MV ditribution

Electrical system on board // Without going into the details of the management modalities of the electric distribution or of the layout that an electrical system on board may have, it is possible to describe it in short, however giving the possibility to understand its structure and complexity. In the power plants on board of […]

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8 Schemes To Supply MV Switchboard

MV switchboard supply solutions // Medium voltage networks are made up of switchboards and the connections feeding them. Let’s take a look at the eight different supply modes of these medium voltage switchboards. We’ll start with the main power supply solutions of an MV switchboard, regardless of its place in the network. NOTE // The number of […]

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Analysis of pole-mounted MV/LV transformer grounding

MV/LV transformer grounding philosophy // Let’s discuss in some detail the reasons for the grounding philosophy adopted for pole-mounted MV/LV transformer substations illustrated in Figure 0. LV grounding MV grounding Combined MV/LV grounding Separate MV/LV grounding MV electrode LV electrode Pole transformer basics (VIDEO) LV grounding The purpose of LV system grounding is as follows: […]

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4 Factors To Consider When Selecting a Sectionalizer

Distribution system protection // Sectionalizers are (beside overcurrent relays, reclosers and fuses) one of the most used for distribution system protection. A sectionalizer is a device that automatically isolates faulted sections of a distribution circuit once an upstream breaker or recloser has interrupted the fault current and is usually installed downstream of a recloser. Sectionalisers […]

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SF6 or Vacuum MV Circuit Breaker In Specific Switching Applications

Matching the MV circuit breaker to the task Many years of experience in developing both SF6 and vacuum medium-voltage circuit breakers has yielded up ample evidence that neither of the two technologies is generally better than the other, and especially that they are complementary from the application point of view. Typical of such special applications […]

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