The transformer substations are connected together either directly by distribution cables (Figure 6) or by feed cables as in the opposite station concept shown in Figure 7. Medium voltage networks are networks with rated voltages of over 1kV and up to 36kV. The requirements for configuration and the rated data of the medium voltage switchgear installations are to be deduced individually from the network structure concerned. Medium-voltage switchgear are further differentiated according to 3 opening types: An interlock in the the panel grants access when live parts are isolated and earthed. IEC 62271-200 (VDE 0671-200) specifies categories of operational availability (LSC, loss of service continuity) of the functional units of a switchgear. (From the “Distribution Switchgear – General catalogue”) BA2000 In=3200 A (IP65); I cw max =100 kA. These cells are typically wired in series to achieve a desired voltage and may also be wired in parallel to achieve additional ampere capacity. electrical design calculations 1. Data on the room volume, the area of the free relief cross section and the short-circuit current to be tested are entered into a matrix. Tools and precise work instructions are needed to open the compartment, for example including a safety note. Frequently, the background conditions dictated by the network operator’s supply function no longer correspond to the background conditions against which the medium voltage networks were established and expanded. Table 1 gives an overview of the configuration parameters and characteristics which may play a part in the planning. On account of the widely differing structures which result from the demands placed upon them, a distinction is made between industrial and power station service networks on the one hand, and public utility networks on the other hand. Im interested with both single and three installation. Switch-gear. kindly forward single information as well. The busbar and the adjacent panels can remain in operation, Panel partitions and isolating distance with compartmentalization to the busbar, The supply cable, the busbar, and the adjacent panels can remain in operation, Panel partitions and isolating distance with compartmentalization to the busbar and the cable, The tasks of a switchgear substation can vary greatly, Many influencing factors are interdependent. -5℃ 24h.average ＜95% 24h. It must meet the requirement of touch protection and exclude the possibility of maloperation. Consumers with disturbing perturbations on the grid are separated from consumers placing high requirements on the. The flow conditions are defined as boundary conditions. Exits must be arranged in such a way that the length of the escape route inside the room does not exceed 20 m in case of rated voltages up to 52 kV. It is normally essential to perform a network calculation (e.g. Fixed ladders or similar facilities are permissible as emergency exits in escape routes. When specifying and planning medium voltage switchgear for a substation, functions and influencing factors must be matched and an economically efficient solution must be found among the offerings of manufacturers. Probability calculations on reliability facilitate quantification of the reliability of supply in distribution networks. With the aid of ultra-modern finite element methods, pressure calculations can be performed in the entire three-dimensionally mapped space over the entire burning time of the accidental arc. Load (feeder circuit), power to be distributed (busbar), Bus sectionalizer/ busbar coupler, longitudinal (BCL), Switch-over (BCL) using switch or circuit-breaker, Busbar coupler, transversal (BCT) (double busbar), Grid protection, response times, selectivity criteria, Reserves /service continuity, switch-over times, Interlockings, switching fault protection, Grid protection, selectivity requirements, Numerical ratio of switch panels to circuit-breaker panels, Expandability, electrical / mechanical reserves, Room climate: temperature cycling, humidity, pollution, salt, aggressive gases, Place of installation (spatial requirements), Servicing and maintenance (service life of components), Shock-hazard protection during work in progres, Equipment for control, interlocking, and switching fault protection, Equipment for metering, counting, measured-value transducers, Equipment for monitoring and communication, Damping resistor (for voltage transformer), Grid operation, integration into (industrial) processes and operational procedures, Smaller transportation size and consequently easier shipping, Increased reliability of operation due to hermetically sealed primary switchgear section (adverse impact such as from contamination, small animals, contact, condensation are excluded due to the encapsulation), Maintenance-free primary section (no lubrication and readjustment necessary), Better eco balance than air-insulated switchgear referred to the entire system life cycle, The gas-insulated switchgear is safe to touch thanks to its, HV HRC fuses and cable terminations are only accessible if branch circuits are earthed, Operation is only possible if the enclosure is fully sealed (and any doors closed). This problem can be solved by using gas insulated switchgear technology. Study specialized technical articles, papers, and electrical engineering video courses. rms value of maximal short time current. Many medium voltage (MV) indoor switchgear rooms exist worldwide. This is connected to the transformer substation by feed cables and supplies power close to the load, for example via a ring network. Examples of reliability characteristics include interruption frequency (stated as 1/a), i.e. The content is copyrighted to EEP and may not be reproduced on other websites. The Metal Clad Switchear is fed by two 34KV lines and a tie breaker . The substation, also called secondary unit substation, where the energy is transformed from medium into low voltage and distributed as such. Otherwise, for example, high circulating currents could flow or the short-circuit withstand capability of equipment could be exceeded. The content is copyrighted to EEP and may not be reproduced on other websites. 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