Tools and precise work instructions are needed to open the compartment, for example including a safety note. The Design Engineer should consider the following points while doing 'BUSBAR SIZING CALCULATION': Adequate minimum required clearance between … 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. A BCL makes sense if the busbar sections are to be operated as alternately separated or coupled. Load centre substations are to be designed as circuit-breaker systems. PG 18-10 – ELECTRICAL DESIGN MANUAL December 1, 2019 . 4. components; this knowledge leads the design engineer to consult numerous documents and technical catalogues. Gas-insulated switchgear should be used for the medium voltage consumer substation. CANDIDATES ONLY FROM LIGHTING / SWITCHGEAR SALES with DIRECT / PROJECT SALES, working with ARCHITECTS / CONTRACTORS / CONSULTANTS and BUILDERS. the expected value for the frequency with which interruptions are to be expected by consumers in the network, and non-availability (stated in min/a), i.e. It is normally essential to perform a network calculation (e.g. These are corridors, connecting passages, access areas, transportation and escape routes. For transformer substations in explosion-proof design, there are no medium voltage connections between the substations. This requirement does not apply to walk-in busbar or cable conduits or ducts. Consumers classified according to importance and assigned to service continuity requirements placed on the grids. with NEPLAN) in order, for example, to take account of the contribution of motor loads to the short-circuit current or to be able to formulate requirements for … Various pressure load scenarios can be calculated for specific switchgear types, short-circuit currents, and installation sites. This kind of accessibility shall not be usable during normal operation or maintenance. Design calculations establish minimum guidelines and requirements for generating electrical calculations on projects. In that process, load flow and phase fault current calculations are accompanied above all by probability calculations to estimate reliability. IEC 61439-1: Low voltage switchgear and control gear In case of more intense branching (rule of thumb: more than five feeders), the single busbar can be subdivided once or several times, with its own feed-in in every section. 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. They switch large consumers, mostly … At the primary distribution level (Figure 1) you will find the. - the IEC TR 61439-0, which is a support for the spe-cification of the switchgear assemblies according to the installation, environmental and performance requirements, and a great help in using the Standard IEC 61439. The selection parameters for the configuration of switchgear can be distinguished as follows: For example connection to earth, grid voltage, grid frequency, neutral-point connection, ambient conditions, peak short-circuit current. is a general term used to refer to a range of switches, circuit breakers, fuses, etc., which are used in an electric power system to control, regulate and switch the circuit on and off. For installations with a rated voltage up to 52 kV, the length of the escape route inside the room must not exceed 20 m (40 m for installations above 52 kV). The choice of suitable system configuration is therefore. IEC 62271-200 (VDE 0671-200) specifies categories of operational availability (LSC, loss of service continuity) of the functional units of a switchgear. average ＜35℃ 1 month average ＜90% Changed supply areas, for instance as a result of corporate mergers. installations in accordance with IEC 62271-200; VDE 0671-200). The terminal voltage per cell varies with the battery's chemical composition. This problem can be solved by using gas insulated switchgear technology. the probability of finding a consumer without supply. The results of the reliability calculations for each consumer are as follows: Those for the system as a whole are as follows: In addition, the contributions of the individual pieces of equipment to the “unreliability” of the network can be quantified. its all great stuff keep up the good work. The design calculations shall be to the approval of the Engineer and shall be based on the methods given in the standards listed. Clearance Calculation in Air Insulated Substations: All the required minimum distances throughout the whole substation can now be automatically determined based on the 3D substation model processed by the Phase Checker. Operate the installation from a safe distance. It is normally essential to perform a network calculation (e.g. The operating room must be equipped with pressure relief openings of sufficient cross section or with a pressure relief duct. Learn about power engineering and HV/MV/LV substations. kindly forward single information as well. Can I design with cable or trunking from 2500-6000amps. For this there is no simple recipe with an unambiguous solution for engineers, simply because: Generally, a switchgear substation MUST provide a high level of safety so that both operator protection and fault-free network operation is ensured. In this type of switchgear, all the necessary components of switchgear can be assembled in very limited space. Tell us what you're thinking... we care about your opinion! Secondary Distribution – At the secondary distribution level, the switchgear is equipped with switches or a mixture of switches and circuit-breakers, where the proportion of switches clearly dominates. The advantages of gas-insulated switchgear are: Lower space requirements (up to approx. If the wrong breaker should be operated inadvertently, this would not have any safety-relevant consequences in the switchgear, since circuit-breakers are capable of making and breaking all load and short-circuit currents, even under earth-fault and other fault conditions. Access is described through instructions of the operating company, and a lock shall ensure safety of access during normal operation and maintenance. Lighting Controls (26 09 23, 33, 36) J. 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. For example, the most frequent network voltages in Germany are Public utility networks: 10 kV and 20 kV, and for industrial and power station service networks: 6 kV, 10 kV and 30 kV. For this reason, appropriate measures in relation to the room situation must be provided for pressure relief. 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. 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. On-site or workshop-built switchgear in accordance with IEC 61936-1 (VDE 0101-1), as it is rarely built nowadays.