Medium voltage switchgear pdf. INSTALLATION AND OPERATING INSTRUCTIONS. Alva elevates electrical safety and supply continuity withh ABB's innovative earth-fault protection method (CS) In order to design a medium-voltage cubicle, you need to know the following basic magnitudes: Voltage Current Frequency Short-circuit power. Our range of ring main units (RMUs) are all suitable for both indoor and outdoor locations and are designed to operate in the most extreme environmental conditions. Metal partitions segregate the compartments from each other and the live parts are air-insulated. LBS load break switch direct coupled main or feeder disconnect. ABB Ability™ digital switchgear solution ensures reliable power in Helsinki's smart city district. Metal-Clad Switchgear Compartmentalization Medium voltage metal-clad switchgear equipment conforming to C37. . 2” states switchgear rated with a maximum voltage of 15 kilovolts must have an impulse voltage of 95 kilovolts, relating to a distance (in air) of approximately 160 millimeters. file_download. This design prevents the possibility of a phase-to-phase fault. Allowing you to increase uptime whilst reducing maintenance costs and risks. Medium-voltage (MV) gas-insulated switchgear (GIS) types 8DA10 and 8DB10 are gas-insulated, vacuum circuit breaker designs with a maximum design voltage of 4. Cat® ATS is perfect for any emergency or backup system and suitable for service entrance use. To accommodate this need, the PST can be provided in a Model-9 configuration (see Figure 13). 2 1 Plug-in voltage transformer – feeder 2 Isolating system for voltage transformer 3 Gas density sensor and filling valve to 1000 volts AC is classed as low voltage. g. 2) For switchgear with switch disconnector (630 or 1,250 A), width of 1,000 mm. 5 kA Notes: 1) Other degrees of protection under request. Medium voltage from design to installation. 6 1. A further enhancement can be achieved by providing pressure relief to outside the switchgear room. 5-1 for available Type MVS-ND switchgear assembly and Table 8 . These voltage ratings are mainly used for distribution and industrial networks. 20. White paper. 5 kV, 3150 A, 40 kA. 12,81 MB. Eaton offers multiple solutions for medium-voltage transformer primary protection. Siemens leads the industry with a full spectrum of medium-voltage circuit breaker and switchgear systems, setting the benchmark for reliability and efficiency. 6 0. After the switchgear erection has been completed, a final inspection is made covering various aspects of both indoor and outdoor switchgear. are known to be serious sources of electromagnetic disturbance, the combination of the high voltage switching disturbance and. No live parts exposed. Image analysis. 2 - Gas-insulated medium Improve safety of your Medium Voltage (MV) installations, complying with the latest evolution of IEC standards, with our Medium Voltage Technical Guide! In addition, it offers guidance on integrating digital technology and IoT that are already shaping the design of sustainable and future-ready MV applications. set of devices dedicated to the transformation of the voltage supplied by the distribution network at medium voltage (e. The details of this inspection are discussed below. With Cat® medium-voltage ATS you can be. Low voltage distribution equipment typically operates at less than 600 volts; in contrast, medium voltage equipment affords a wider range of 600 to 38,000 volts. : 881-4027. Medium-voltage vacuum breaker switchgear. extinguish an internal arc fault in a switchgear in a few milliseconds, much earlier than the short-circuit current reaches the first peak value, drastically reducing the devastating effects caused by such faults. The above equipment and systems integral to them are complete and ready for functional testing. 2 is a compartmentalized design, wherein primary conductors are fully insulated for the rated maximum voltage of the assembly, and all major primary circuit components are isolated from each other by grounded metal barriers. The VFI mechanism is equipped Medium Voltage Switchgear Construction Checklist Page 1 of 6 Version 02/06 Medium Voltage Switchgear Construction Checklist (over 500 kVA) Project: Date: Building: Location: Submittal / Approvals Submittal. UniSec offers a broad portfolio of functional units and technical features and is suitable for a wide range of applications including industry, substations, data centers, small generation systems, buildings & infrastructures and smart grids. An electric power distribution system is the final stage in the delivery of electric power; it carries electricity from the transmission system to individual consumers. The Model-9 configuration is supplied with an iST-921 control Contact Sales. With UniGear Digital you avoid many of the practical challenges you face in today’s complex applications, you simply have less to worry about in Jan 1, 2011 · Since switching operations inside a medium voltage switchgear. 8 0. ca. make your switchgear smarter? Better connectivity with great benefits. These concepts of utilizing front-accessible-only equipment, equipment utilizing more factory assembly, and smaller components to reduce equipment floor space with associated reduced NEC floor space requirements also apply to equipment rated over 600 V. UniGear ZS1 is medium voltage switchgear with a metal enclosure, suitable for indoor installations. Discover our range of medium-voltage switchgear with air, gas or shielded solid insulated technologies. ABB's eco-efficient AirPlus™ technology delivered to Norwegian smart grid. Nov 16, 2016 · High-voltage switchgear was invented at the end of the 19th century for operating motors and other electric machines. This maximum operating voltage should not be exceeded by the power system to which the circuit breaker is applied. TAGE TEDVOL 1-RA. The VFI, isolation and grounding positions are internally interlocked so proper sequence operation is ensured. This practical guide provides complete support and advice for all electrical professionals who learn, prescribe, design, install, operate, inspect, and maintain medium voltage installations regardless of the field of applications and matching even the highest demands. comparisons are made between the three 10 MTW - Medium Voltage Switchgear and Motor Control MTW03 Switchgear Rated Voltage up to 17. 01 · 2016 Introduction to medium-voltage components Medium voltage is defined as the range above 1 kV up to and including 52 kV (alternating volt-age). An illustration of medium-voltage space reduction the switchgear, such as technical data, detailed equipment lists, comprehensive circuit docu-mentation etc. The polyphase design (non-isolated) either in air-insulated switchgear (AIS) or GIS contains all three phases in one housing that could allow Most typical variants: RMU with standard variants up to 5 modules (12-24kV) or 4 modules (36kV) Harmonized for higher flexibility: Select SafePlus switchgear for more options. See: “General description”. Designed to meet both IEC 62271-200 and IEC 37. Title: MV application guide for engineers to select and specify the right MV equipment – AuCom. Medium Voltage Pro (MVP) has been developed to be a switch gear configuration tool and helps design offices in creating a switchgear lineup including front elevations and floor plans. Schneider Electric Egypt. 03. 4. Medium Voltage switchgear (AIS type): SF6 withdrawable circuit-breaker up to 24 kV MCset 24 kV is an indoor switchgear assembly that provides maximum user safety. Part of our Set series of MV equipment and the result of over 25 years of experience, our EcoStuxure-ready SM6 switchgear takes substation Mar 26, 2019 · Type 8BT2 Extendable Truck- Type Circuit-Breaker Switchgear up to 36kV Metal-Enclosed, Indoor Installation, LSC 2B PM, Single Busbar, Air-Insulated. More than remote control facilities, digital offers better versatility, especially Designed to limit maximum temperature rise of conductors to 65 degrees C. Metal-enclosed indoor type. This requirement eliminates the most common types of direct contact temperature monitoring systems, leaving only non-intrusive Electrical and Industrial | Power management solutions | Eaton MCSet 24 kV. The NXAIR family has been launched in 1998, continuously enhanced and individually adapted to the specific market requirements of the different industries and power supply companies. Traditional load break air switch with power fuse protection for power distribution Square D HVL is a traditional medium voltage load interrupter and air insulated switch, with power fuses to provide short-circuit protection up to 1200A at 38kV. Contact. 5kV, for the US and EMEA markets. Key features. The main use of SF6 is in MV and HV switchgear: the place of SF6 can be globally summarized as detailed in figure 12 . Product range. 1,09 MB. • UL1558 and ANSI/IEEE C37. For Low & Medium Voltage Switchgear, Protection & Control Relays, & Circuit Breakers PDF. 415 kV Eaton’s padmount VisoVac three-phase medium-voltage switchgear utilizes Eaton’s proven vacuum fault interruption technology and is available with visible isolation and visible grounding capability. There are several varieties of medium voltage switchgear, including: Metal-enclosed outdoor type. HVL Switchgear. PDF. Our switchgear line is entirely manufactured in-house, The role of cutout-based reclosers in modern grid protection: Eagle single-phase recloser. Its width is optimized to be 550mm, so as to provide more compact solution for the increasingly scarce space and reduce the construc - 3. Paralleling Switchgear by Maurice D’Mello 5 September 2008 For low voltage PSG; • UL891 – For Dead-Front Switchboards. The IEEE c37. 5 kV. Type MVS-ND Metal-Enclosed Load Interrupter Switchgear Assembly Main Cross Bus Ratings Rated Maximum Voltage Power Frequency Withstand Voltage, 60 Hz, 1 Minute Lightning Impulse Withstand Voltage (LIWV) (BIL) Rated Main Medium voltage switchgear refers to switchgear systems that can sustain voltages between 3 and 36 kV. It is also available for application in auxiliary Select your location | Eaton Each gas compartment is equipped with a on-return filling valve (with protective cap) and repair openings. Ground load and line side connections. The rated Our latest SM6 MV switchgear features 24/7 connectivity giving you unparalleled visibility of your equipment’s health status. For medium voltage PSG; • ANSI/IEEE C37. Medium voltage switchgear is used in transformer substations and switching substations, and in secondary unit substations and customer substations (in public utility networks only). According to the new standard, the series must be extended by another 5 voltage impulses if a disruptive discharge has occurred during the first 15 impulses. 2 - Gas-insulated medium voltage switchgear ( en - pdf - Brochure ) Relion® product family relays to Grassridge Wind Farm project ( en - pdf - Reference case study ) ZX Familie - SF6 gasisolierte Schaltanlagen <52 kV ( en - pdf - Presentation ) ZX0. Order No. 2Revision 04 * INSTALLATION AND OPERATING INSTRUCTIONS 8BT2 * 881-4027. This requirement eliminates the most common types of direct contact temperature monitoring systems, leaving only non-intrusive Vertiv offers an indoor MV switchgear line, ranging from 1kV to 40. VC-W MR2 is an optional motorized racking device accessory installed inside a circuit breaker or auxiliary compartment. Table 8. Module width: 325mm for 12-24kV, 420mm for 36kV. Format: arc fault testing, our switchgear systems are notable for maxi-mum operator safety. In this unique technical guide Ampgard control has a complete metal-enclosed offering: Full and reduced voltage starting of medium voltage motors up to 8000 hp. 9. Medium voltage switchgear for primary distribution up to 42 kV suitable for indoor installations. 1 – For Metal-Enclosed LV Power Circuit Breaker Switchgear. 2. Power-Zone™ 4; Medium Voltage Metal-Enclosed Switchgear. This more stringent IEEE standard reduces the HVAC requirements in the room and prolongs the life of the switchgear. The inspection checklist outlines steps to check alignment and connections, identify components, inspect breaker operation and contacts, and test insulation resistance, relay calibration, and breaker functions. medium-voltage, metal -clad switchgear. 5 kV 2500A MCset 24 kV is an indoor switchgear assembly that provides maximum user safety. The system includes several standardised cubicles which can be delivered either as a complete switchgear and controlgear or as individual cubicles. ZX Family - Medium Voltage Primary Gas-insulated Switchgear ( en - pdf - Presentation ) OEM/Panel builder partner program - Concept for power parts and core modules for MV GIS ( en - pdf - Presentation ) ZX2 - Single busbar systems up to 5000 A - Gas-insulated medium voltage switchgear ( en - pdf - Leaflet ) ZX2 - Single busbar systems up to NXAIR switchgear is the result of many years of experience. This means that all high voltage parts are housed in the encapsulated main circuit enclosure and are inaccessible from the outside. One full range up to 40. Proper inspection helps ensure UniGear ZS1 is medium voltage switchgear with a metal enclosure, suitable for indoor installations. This feature prevents the removal of the load-side panel while the load interrupter switch is closed and/or the optional ground switch is open. Upon completion of this course, you should be able to: List and explain the voltage level conventions used in electrical equipment. Purpose. The specifications for each product are Medium-voltage compact switchgear. 7 [8] actual test results data, obtained from a certified high voltage test facility, offers the reader a true snapshot of pressures developed within standard metal-clad switch- gear enclosure using the latest blend of arc abatement topologies. Horizontal bussing uses a solid shielded insulation system. Gas-insulated, medium-voltage, arc-resistant switchgear. Speed-D SB/SF (UL Listed) Merchandised, Service Selection; Low Voltage Switchgear. MCset 4. Eaton’s XGIS utilizes a compartmentalized Figure 2 – Outdoor medium voltage switchgear in a compact substation. Knowing the voltage (kV) will allow us to define the dielectric withstand UniGear ZS1 is medium voltage switchgear with a metal enclosure, suitable for indoor installations. It is available for application in circuit breaker compartments of 5/15/27/38 kV Type VC-W arc and non-arc, and 5 kV VC-W ND metal-clad switchgear. 2 Standards and specifications ZS1 switchgear comply with the standards and specifications for factory-assembled and type tested high voltage switchgear in VDE 0670, and This course provides information on the construction, operation, maintenance, and inspection of medium voltage switchgear and circuit breakers. Each has features to ensure convenience, reliability, and durability. Jan 11, 2014 · 6 Primary switchgear | ABB Medium Voltage Products Primary switchgear Gas insulated primary switchgear ABB’s ZX series gas insulated primary switchgear is designed to offer the ideal combination of flexibility, reliability, availability, safety and economy for industrial and utility applications up to 40. MiniBreak™ Premset™ HVL/cc™ HVL; Medium Voltage Gas-Insulated Switchgear 112 Types of Switchgear This Handbook provides general guidelines for the proper maintenance of electrical switchgear used in postal facilities. 5–800kV Live Tank Circuit Breakers — 72. The technology has been improved over time and can now be used with voltages UniSec is an indoor air-insulated switchgear for medium voltage secondary distribution up to 24 kV, 1250A, 25kA. Key benefits. Oct 10, 2019 · 1. rated lightning impulse withstand voltage. This design guide provides dimensions, layout examples, technical specifications and application information for Power Xpert IGX 5-38 kV, compact arc-resistant medium-voltage SafeGear® medium voltage, metal-clad switchgear for primary distribution up to 15 kV suitable for indoor installations. 1 Check nameplate information for correctness. Isolated-phase GIS segregates each phase of the switch, circuit breaker, and bus section into three separate housings (phases A, B, and C). SafePlus is a metal-enclosed compact switchgear system for distribution Low Voltage Switchboards. METAL ENCLOSED MODULAR SWITCHGEARS. HVL/cc switchgear is available in both indoor and outdoor enclosures. Electrical substations can also be divided into public and private substations: ABB delivers state of the art technologies to Italy’s most innovative data center. Theratdvolgisfnbyu. The voltage, the rated current and the rated frequency are often known or can easily be defined, but how can we calculate the short-circuit power or the short-circuit current at a given point in an The PST switchgear is designed in the industry-standard Model-6 configuration (Figure 12) however, occasionally two critical loads must be served, each independently, from the same source. Our MV switchgear can be used in a full range of primary or secondary distribution applications with AIS, GIS and 2SIS technologies embedded with leading protection and automation that brings IoT connectivity to your MV installation. Refer to Table 8 . Specific models of switchgear apparatus are not described in detail because of the large variety of models available. As mentionned above, switchgear manufacturers use the unique dielectric or/and breaking properties to design their equipment. Jun 21, 2020 · Planning of medium voltage systems. strong MR2 Hand-Held Pendant. 5kV. 2 – For Metal-Clad and Station Type Cubicle Switchgear. Durability To ensure durability, we employ the ZX0. How can digital . The medium voltage switchgear AX1 is not just a medium voltage cubicle, but also a complete switchgear system/installation. Low voltage. Components for Medium Voltage switchgear schneider-electric. This technical article is exclusively Metal-clad switchgear is defined by IEEE C37. , can be found in the relevant order documents. ABB is keeping the power on at With our complete range of circuit breaker and switchgear systems for medium-voltage, Siemens sets the standards when it comes to reliable and efficient solutions. Both oil and gas insulated ring main units are the result of extensive innovation, using advanced technologies and are subjected to extensive testing and safety standards. ABB helps Toronto railway cut emissions to zero. Below are the sw tchgear types and def n t ons wh ch are frequently used n secondary d str but on systems or ndustr al fac l t es. Image taken using Image taken using wavelength λ1 wavelength λ2. The 8BT2 switchgear corresponds to the following classifications according to IEC 62271-200. This can lead to a maximum of 25 voltage impulses, whereas the maximum number of permissible disruptive discharges is still 2. 9, Power Xpert IGX is designed to protect personnel from arc faults on both grounded and ungrounded systems. Technical characteristics Product UniGear ZS1 Rated voltage [kV] 12 Rated insulation level Mar 24, 2017 · Medium Voltage Technical Guide // Basics for MV cubicle design – Schneider Electric. Our MV switchgear can be used in a full range of primary or secondary distribution applications with AIS, GIS and 2SIS technologies. Low amount of SF6 used per panel: 5 - 10 kg. This Mechanical interlocks are standard. Operation at slight overpressure - rated operating pressure 130kPa (alarm level 120kPa) for rated voltage > 36kV. Part of SeT Series View Products. industrial sites typically rely upon either low or medium voltage service entrance equipment to control or cut off the electrical supply of their buildings from a single point. Major elements of low voltage switchgear are circuit breakers, potential trans-formers, current transformers, and control circuits, refer to paragraph 5-3. List and describe the components that make up electrical switchgear. PUBLIC. Final Inspection. Connectivity combined with IoT, brings more value in Power management. 400 V). Eaton load interrupter (Type MVS) metal-enclosed switchgear provides safe, reliable switching and fault protection for medium voltage circuits rated from 2. Medium voltage networks are networks with rated voltages of over 1kV and up to 36kV. Rated voltage up to 42 kV; rated feeder current up to 5000A. It is intended to meet all electrical distribution needs from 24kV and incorporates a set of innovative solutions designed using proven techniques. No checks on the insulating gas are necessary and Gas Insulated Switchgear — 72. Digitalization simplifies construction while increasing safety and versatility. 5–550kV Key Features & Benefits Designed for Reliability and Safety Our design features a minimum number of moving parts and live parts have been enclosed to protect the insulation system against the external environment. Perform intensity conversion and calculate difference in light absorption between the two wavelengths. Since the switchgear is highly modular type, this make simple selection of components required by any application. 2 - Gasisolierte Schaltanlagen ( en - pdf - Presentation ) ZX0. The MVS switch is ideal for applications where high duty cycle operation is not needed. Development of Medium-voltage Switchgear for Reducing Environmental Impact and Space-saving 158. 2 1. Knowing the short-circuit power of the network allows us to choose the various parts of a switchboard which must withstand significant temperature rises and electrodynamic constraints. The main technical characteristics are shown as follows. Vertiv™ PowerBoard Medium Voltage Switchgear is entirely manufactured in-house and is available in air-insulated and gas insulation options, as well as metal-clad and metal-enclosed options. Overview. Related elements of the It is now expanding its product. 16 kV up to 38 kV (42 kV on request). Circuit breakers are rated at normal rated voltage and maximum operating voltage. Lightning impulse-withstand voltage ratings up to 200 kV BIL and interrupting ratings up to Apr 9, 2021 · Medium and high voltage switchgear consist of several sub- systems, and the single-line diagram of a GIS unit comprising CB, current transformer, potential transformer , isolator, and Apr 10, 1991 · lation, operation, or maintenance of the switchgear assembly. The most common construction with the switchgear is an indoor-mounted metal-enclosed one. 1 MV and HV switchgear. 20 kV), into voltage values suitable for the power supply of the low voltage lines (e. Go back to the Contents Table ↑. 3 Inspect all covers, panels section and doors for paint work and Application. 2 and refers to the construction of medium-voltage electrical switchgear where all electrical components including the incoming bus, outgoing bus, instrumentation and main circuit breaker or switch, are enclosed in separate metal compartments to provide an additional level of safety, ruggedness and ease of maintenance. 4 kV through 38 kV. Classification. Energy kA2s Time/ms Arc extinction within ≤ 4 ms (after detection) 1. Disconnect all low voltage and medium voltage power sources to the switchgear assembly before working on the equipment per Occupational Safety and Health Act (OSHA) and lockout pro-cedures. Panels are available as a single busbar, double busbar, back-to-back or double level solution. a. Rather, maintenance information is presented for five classes of switchgear equipment: Product definition The Uniswitch is an air-insulated, metal-enclosed, three-phase, medium voltage (MV) switchgear and controlgear. In this unique guide, you receive the support needed for MV equipment, from design, through operation, up to end-of-life. 2019. 2 Rating Considerations. 5 kV Rated Current up to 3,150 A Three-Phase Symmetrical Short-Circuit Current (Icc) up to 31. 5-1. Verify that the voltage has been removed. Gas leakage < 0,1% per year. The switchgear works as a connection node between the outgoing distribution feeders and the in-feeding power transformers. Technical characteristics Product UniGear ZS1 Rated voltage [kV] 12 Rated insulation level UniGear ZS1 - Air Insulated Switchgear ( en - pdf - Catalogue ) UniGear Digital to Siberian Coal Energy Company_Success story ( en - pdf - Reference case study ) UniGear ZS1 - Medium voltage, arc-proof, air insulated switchgear up to 24 kV insulated voltage ( en - pdf - Catalogue ) The purpose of all cable systems is to allow the transit of electrical energy which implies that in order to determine the system layout, it is necessary to know the following basic data: rated voltage, laying procedure, operating and short-circuit currents, conductor type. They provide reliable automatic transfer to standby power when: • the normal power source fails • peak shaving is used • the power source is unreliable • backup power is mandated by code or local These topics are crucial for medium voltage energy to ensure better performance and sustainability of switchgear and installations. Optional integrated remote control Oct 2, 2019 · This is the rated test frequency of the switchgear and must match the operating frequency of the installation. Main components of ZX1. 60 Hz in American systems. Field inspections of new medium-voltage switchgear should include checks of equipment installation and components as well as testing various functions. See Full PDFDownload PDF. Outdoor style without metal enclosure and a variety of other variations. FlexSeT (cULus Listed) QED-2 (UL Listed) QED-6 (UL Listed) CMM (UL Listed) Speed-D™ Switchboards. This document contains detailed information about each product’s ratings, options, certifications, benefits, and several typical applications to distinguish the values and benefits between the varying solutions. UniGear Digital combines the well-known and established medium voltage switchgear and latest digital technologies, to enable smart electrical networks that deliver power reliably and efficiently. Minimal maintenance. Siemens medium-voltage air-insulated switchgear The air-insulated switchgear follows the classic de - sign of NXAirS and has the features of NXAirS stand-ard switchgear. 9 Revision: 04 Issue: 26. 1. Well-proven ZX switchgear for applications up to 40. 4 0. medium voltage switchgear in a safe and economical way. Interrupter Switchgear, Section 5. 0 0. 3 metal-enclosed switchgear, UL Listed. Rated short time current up to 40 kA/3s. This document uses the term “medium voltage switchgear” to denote a random, but in actual practice, existing combination of DR6 functions that, mutually coupled and connected, constitute a client-specific transformation or distribution station. From a definition point of view AX1 is a primary encapsulated and air insulated switchgear. Start your sales inquiry online and an expert will connect with you. Medium voltage switchgear for primary distribution up to 27 kV suitable for indoor or outdoor installations Advance is ABB’s ANSI platform for 5, 15 and 27 kV rated metal-clad switchgear featuring a narrow footprint and designed and tested according to IEEE C37. 2. Constructed with majority of medium-voltage parts fixed-mounted and sealed in enclosures to withstand harsh, and corrosive environments. Equip-ment equal to or greater than 1000 volts but less than 100,000 volts AC is classed as medium voltage. P-AIS MV Switchgear withdrawable CB up to 17. Designed to IEEE 37. 2 0 0 10 20 30 40 50 60 70 80 90 4 Vacuum Switching Technology and Components for Medium Voltage · Siemens HG 11. All medium voltage roll-in replacement 11kV connectors terminating EPR cable into medium voltage switchgear (photo credit: Thorne & Derrick) Go back to Contents Table ↑. 2 Inspect enclosures for proper alignment, foundation fixing and grounding. Circuit-breaker switchgear type 8BT2 is a factory- assembled, type-tested, metal-enclosed and metal-clad switchgear for indoor installation according to IEC 62271-200. 2024-05-24. 4 1. - Enjoy the Air! Siemens NXAIR is a medium-voltage switchgear based on innovative air-insulated Eaton’s Power XpertT XGIS gas-insulated metal-enclosed switchgear is an integrated assembly of SF6 pressurized tanks, bus and disconnect switches that are coordinated electrically and mechanically for medium-voltage circuit protection. Main breaker metal-enclosed switchgear, a smaller footprint, single integrated assembly direct coupled to the Ampgard control. Manufactured n accordance w th IEC 62271 - 200, 60265, 60129, 60694, 62271 - 100, 62271 - 102, 62271 - 105 standards. Two medium voltage mains supply frequencies are used globally: 50 Hz in European systems. Distribution substations connect to the transmission system and lower the transmission voltage to medium voltage ranging between 11/33 kV and 0. 5-2 for MVS-ND switch ratings. Technical characteristics Product UniGear ZS1 Rated voltage [kV] 12 Rated insulation level Aug 15, 2023 · Primary medium voltage switchgear represents an important part within the primary distribution substation functionality. jx tm hx wu sk mi ba rz ul ek