The guidelines for design, installation, operation and safety of APFC panels are followed based on this international standard. Deploy installations which are arcing-fault-tested instead of installations in open design (e.g. electrical design calculations 1. IEC 60831: Part 1 & 2-Shunt power capacitors of the self healing type for a.c systems having rated voltage up to and including 1kV. General Requirements 1-5 . 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. Apart from the high load density, industrial and power station service networks are frequently characterized by: As a consequence, the structure of industrial and power station service networks is strongly influenced by the requirements of the relevant production process. 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. The manufacturing quality is monitored by routine tests. Opening the switchgear under normal operating conditions or for maintenance, for example to replace HV HRC fuses, is possible. Table 1 Switchgear Switchgear model HICLAD 20GB HICLAD 30GB Switchgear type NBG-24 BGB-36 Applicable standards IEC62271-200 Clasification of switchgear SF6-insulated metal-enclosed Service condition Altitude Ambient temperature Relative humidity <1000m Max. components; this knowledge leads the design engineer to consult numerous documents and technical catalogues. This problem can be solved by using gas insulated switchgear technology. The number of outgoing and incoming feeders, Separate operation of parts of the installation required, Operability of certain installation parts required during maintenance work in progress, Switch-over of consumers to different feed-in sections. We have completed more than 800 new and renovation projects for various industries. Definition of planning principles and criteria, Technical and commercial comparison of the network varianrs, and, Expected average interruption duration (in min or h), Expected energy not supplied on time (in MWh/a), SAIFI (System Average Interruption Frequency Index): Expected average interruption frequency in 1/a), SAIDI (System Average Interruption Duration Index): Expected average non-availability (in min/a). Closed electrical operating areas: A closed electrical operating area is a room or location used solely for the operation of electrical switchgear and is kept locked. rison with a tested reference design by calculation”. Additionally, the pressure distribution on the walls can be shown as a contour plotting at a certain point in time (Figure 9). Sizing of these battery banks, therefore, includes selecting the number and type of cells to be used. The calculations shall include the following parameters: Earth resistance of the … It is defined in kA for 1, 2 or 3 second(s) and is used to define … The opposite stations can be designed as switch-disconnector systems. Access is described through instructions of the operating company, and a lock shall ensure safety of access during normal operation and maintenance. The requirements for configuration and the rated data of the medium voltage switchgear installations are to be deduced individually from the network structure concerned. Operational management of these network concepts is more complex, as coupling of the transformer substations through the medium voltage network has to be avoided when switching operations are performed in the network. average <35℃ 1 month average <90% Keep operating aisles as short, high and wide as possible. Design and Installation of Medium Voltage Switchgear (Facts You MUST Know), Electrical engineer, programmer and founder of, Standards for the Design and Installation of MV Switchgear, Service continuity during work in progress, Estimation of pressure effects according to Pigler, Finite-elements-simulation of pressure load under conditions of arcing, very short tripping times from fast-acting relays, When an accessible compartment of the switchgear is opened…, The busbar and therefore the complete switchgear must be isolated, No partition plates within the panel, no panel partitions to the adjacent panels, Only the supply cable must be isolated. the probability of finding a consumer without supply. ... Electrical Design Calculations For Industrial Plants. I am a member , I have been reading your articles for a while , I usually do design for low voltage power systems (up to 600 V) and some 15.5KV using E power fuses. 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. Ordinary persons are allowed only when accompanied by electrically skilled or instructed persons. 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.The switchgear is almost completely equipped with circuit-breakers. I am learning more about these MV stuffs. The internal arcing test was made with a test current of 25 kA for a duration of 1 s. Note: Medium-voltage switchgear are generally tested for accessibility of Type A. The classification distinguishes as follows: Example: – Internal arc classification: IAC AR BFL 25 kA 1 s. The specification means that the rear side may only be accessed by qualified personnel, whereas the front and lateral sides may be accessed by anybody. It is normally essential to perform a network calculation (e.g. The function of network planning is nowadays less that of planning the network configuration than rather questioning and optimizing the existing, in many cases historically determined, network structures when replacement investments are impending. 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) Therefore, these substations are called load-centre substations. Tools and precise work instructions are needed to open the compartment, for example including a safety note. Thus the customer benefits from extended planning security and a cost-optimised solution. Corridors and access ways must be sufficiently dimensioned for work, operation and transportation of components and must have a. Corridor width must not be obstructed by equipment protruding into the corridor, such as permanently installed drives or switchgear trucks in disconnected position. 4. The IEC 62271-200 (VDE 0671-200) standard for metal-enclosed switchgear distinguishes between accessibility level A for authorized personnel and accessibility level B for unlimited access (also for the general public). The switchgear is going to be a GIS (Gas Isolated Switchgear). Lighting Controls (26 09 23, 33, 36) J. Various pressure load scenarios can be calculated for specific switchgear types, short-circuit currents, and installation sites. The result is precise enough to fall within an acceptable tolerance to meet NEC requirements. These network concepts can provide an economical alternative when the construction of an additional transformer substation is to be avoided, or initially implemented with one transformer only. 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 technical data must be verified by type tests. keep up the good work. 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 network protection. Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! 65 14. Study specialized technical articles, papers, and electrical engineering video courses. For this reason, appropriate measures in relation to the room situation must be provided for pressure relief. 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