Unit Substations (26 11 16) K. Medium Voltage Switchgear (26 13 00) L. Low Voltage Transformers (26 22 00) M. Low Voltage Switchgear (26 23 00) N. Switchboards (26 24 13) Opening the switchgear under normal operating conditions or for maintenance, for example to replace HV HRC fuses, is possible. Design calculations may be made either manually or by SPU-approved computer programs. In analogy to distribution grids, switchgear can be assigned to the primary or secondary distribution level: Primary Distribution – What is characteristic for the primary distribution level are high load and short-circuit currents and high-end secondary features of the switchgear with regard to protection, measuring, and (remote) control. We have completed more than 800 new and renovation projects for various industries. 1 Auxiliary DC Control Power System Design for Substations Michael J. Thompson, Schweitzer Engineering Laboratories, Inc. David Wilson, McLaren, Inc. Abstract—The most critical component of a protection, con- trol, and monitoring system is the auxiliary dc control power A common feature of all the network concepts presented is the radial operating mode of the distribution cables, which not only facilitates simple operational management (apart from the exception mentioned above) but also a simple protection strategy and troubleshooting, particularly with single phase faults (earth faults / short-circuits to earth). components; this knowledge leads the design engineer to consult numerous documents and technical catalogues. The complexity of these rooms varies considerably depending on location, function and technology adopted by the owner. Electrical Panel Design Software - Industrial Power Control (3 phase, 50/60 Hz electrical system, LT electrical panel design software LT, 3 phase electrical panel and switch board designing is no more a tedious and time consuming job now. The currents are lower, short-circuit protection is often ensured by the assigned circuit breaker at the primary distribution level. When fault-affected switching operations happen, circuit-breakers only must be operated. They switch large consumers, mostly … 608 Switchgear Design jobs available on Indeed.com. The choice of suitable system configuration is therefore. The terminal voltage per cell varies with the battery's chemical composition. Prevent the re-energization by use of non-resettable devices which detect internal equipment faults, incorporate pressure relief and provide an external indication. This is connected to the transformer substation by feed cables and supplies power close to the load, for example via a ring network. Both methods assum… Operate the installation from a safe distance. all the accessories required to protect the LV system. Various pressure load scenarios can be calculated for specific switchgear types, short-circuit currents, and installation sites. Gas-insulated switchgear should be used for the medium voltage consumer substation. In extensive catchment areas with low load density, it is often more economical to implement a concept with opposite stations as shown in Figure 4. A BCL makes sense if the busbar sections are to be operated as alternately separated or coupled. The technical data must be verified by type tests. I love the training you are giving. In that case, measuring and metering equipment for billing will also be available. In practice, the load density within the supply territory of a distribution network operator frequently varies over quite a large range, and the higher and lower level networks are not uniform. The manufacturing quality is monitored by routine tests. Considering the hazards involved in the occurrence of an arcing fault, the following aspects should be noted when configuring on the basis of the IEC 61936-1 (VDE 0101-1) standard: According to this, the operating room must always be included in the protective measures to be taken against the effects of an arcing fault: Siemens provides two calculation methods as a service to establish rough guidance values for the calculation of the room size and /or pressure relief openings during the planning phase. It is straightforward and easy to handle, which reduces the likelihood of switching faults. Lighting Controls (26 09 23, 33, 36) J. The content is copyrighted to EEP and may not be reproduced on other websites. It is defined in kA for 1, 2 or 3 second(s) and is used to define … This electrical installation handbook, ho-wever, aims to supply, in a single document, tables for the quick definition of the main parameters of the components of … kindly forward single information as well. The requirements for configuration and the rated data of the medium voltage switchgear installations are to be deduced individually from the network structure concerned. The fundamental functions of network planning and the most important standard network concepts are therefore presented in the following paragraphs. The opposite stations can be designed as switch-disconnector systems. It helps you. New or shifted load centres, with total load nearly stagnating or only rising slightly. IEC 61439-1: Low voltage switchgear and control gear The standards distinguish between two main groups of medium-voltage switchgear: The high manufacturing and testing expense often amortise only if high quantities are produced and the production is standardised accordingly. Keep operating aisles as short, high and wide as possible. Only complete, factory-assembled stations (transformer /load-centre substations) are tested for Type B. In that process, load flow and phase fault current calculations are accompanied above all by probability calculations to estimate reliability. keep up the good work. Individual panels and panel blocks can be mounted side-by-side and extended as desired – no gas work required on site, Low-voltage compartment (cubicle) is available in two heights, wired to the switchgear panel by means of plug connectors. Circuit breaker capacity. Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! This requirement does not apply to walk-in busbar or cable conduits or ducts. In industrial plants, substations are often installed in the production centres which are also load centres. CANDIDATES ONLY FROM LIGHTING / SWITCHGEAR SALES with DIRECT / PROJECT SALES, working with ARCHITECTS / CONTRACTORS / CONSULTANTS and BUILDERS. To get an I cw value suitable to the short-circuit current of the plant: – 5 busbar holders PB3201 at a maximum distance of 425mm (I cw =50 kA) must be positioned. Apply to Data Center Technician, Gas Manager, Civil Engineer and more! The switchgear is almost completely equipped with circuit-breakers. Disconnectors or switch disconnectors at the interruption points create bus sectionalizers, whereas circuit-breakers create longitudinal busbar couplers (BCL). A load transfer switch (coupling) in the substation can form the property border between the supply company and the customer if the customer wants to develop his switchgear part independently. the probability of finding a consumer without supply. We are experts in designing the switchgear under our electrical engineering design services all over the USA. The content is copyrighted to EEP and may not be reproduced on other websites. Limited short-circuit strength of already installed equipment requires a subdivision into two subsystems with switch-overs for load balancing in case of varying power demand. 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). 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