High and medium voltage switchgear assemblies and switching devices switchgears and control gears are important nodal points in modern power systems and it is vital that they work reliably. Hipot test is the most common type of electrical safety test. Method statement for switchgear installation of mv lv hv. It is important when operating on medium voltage equipment that we follow the safety rules and operating regulations in order to be safe. Medium voltage switchgear training course lp management. Ms28 handbook maintenance of electrical switchgear tl4. For doing r phase the other phases are shorted and earthed. Medium voltage switchgear specification page 1 medium voltage metal clad switchgear part 1 general 1.
Disconnect all low voltage and medium voltage power sources to the switchgear assembly before working on the equipment per the occupational safety and health act osha and lockout procedures. Switchgear solutions for primary and secondary distribution to suit every application. Lv panel testing procedure in new 2017lv switchgear testinglv switchgear panel duration. Medium voltage and low voltage switchgear test procedure. Dont forget to subscribe to be abreast with all my new clips, tutorials and other things. Inspection, test and measurement procedures for lv and mv up. Each automatic transfer shall consist of medium voltage 5 kv through 15 kv freestanding metalclad switchgear with vacuum circuit breakers and a. All electrical and mechanical operating procedures take place when the enclosure. This means that all high voltage parts are housed in the encapsulated main circuit enclosure and are inaccessible from the outside. Tests shall be conducted as per ul, ansi and csa standards. Medium voltage operation mv drives and soft starters are temporarily installed in the mv test bay and operated on an mv dynamometer. High voltage safety operating procedures for engineers and technicians revision 6 website. For medium voltage switchgear and controlgear the r.
Repeat for poles 2 through 6, in turn, with other poles grounded. Electrical power aparatus, such as transformers, regulators, air switches, circuit breakers, capacitors, and lightning arresters comprise the components necessary to perform these functions. Partial discharge testing and infrared scanning can be used to obtain data on the performance of the insulation system and the integrity of the switchgear busbars and cable terminations. Section 26 , mediumvoltage circuit breaker switchgear. Maintenance testing we recommend and provide includes the following and more.
Therefore at least following tools shall be arranged before starting the electrical testing job. Low voltage training switchgear low voltage training course length is customizable based on your needs. These numbers result from many years of vlf field use and research. The simosec medium voltage metalenclosed switchgear is designed to meet all the applicable ansi, nema and ieee standards, or the applicable iec standards, as appropriate for the specific contract. In special cases, please contact the schneider electric sales department. Medium voltage switchgear construction checklist page 5 of 6 version 0206 electrically operated circuit breakers exercised in manual mode electrically operated in test position and fully engaged position without main bus voltage applied all incoming cables are. In this article i go to share the actual what we do in after panel switchgear installation and what are the procedure of switchgear testing and commissioning. The contents of this manual follow the procedures for working with ax1. This guide specification is written in accordance with the construction specifications institute csi master format. The switchgear on the low voltage side of the transformers may be located in a building, with medium voltage circuit breakers for distribution circuits, along with. Medium voltage products technical guide the mvlv transformer. The medium voltage switchgears with a single busbar are a clear solution for. A small handheld control console allows the user to fully monitor and control all the switchgear testing process. Switchgear and switchboard inspection and testing guide.
Jul 26, 2016 electrical resistance of the circuit breakers primary circuit is calculated by measuring the voltage drop across the line and load terminals for each phase. Codet nect, osha, and local procedures and standards. Implementing an effective switchgear testing, inspection and maintenance program is essential. Medium voltage switchgear for application on utility infrastructure often requires a variety of redundant systems with maintiemain. Test procedure for ac highvoltage circuit breakers rated on a symmetrical current basis. Instructions for installation, operation, and maintenance of. This may be the only opertunity you will ever have to dismantle a 1200 amp breaker for an inside look. Mediumvoltage metalclad switchgear 122018 section 26 2616340 mediumvoltage metalclad switchgear square dtm medium voltage mastercladtm switchgear by schneider electric schneider electric editors note. For all customers, from system integrators to end users, and all applications, from refurbishment, line extension to new installations. Medium voltage distribution pix schneider electric.
Testing and commissioning progress chart for low voltage cubicle. Medium voltage switchgear internal arc fault test youtube. Switchgears are utilized both to deenergize equipment to permit work to be performed and to clear errors downstream. The most important tests for medium voltage metalenclosed. Disconnect all low voltage and medium voltage power sources to the switchgear assembly before working on the equipment. Designed to verify that the insulation of a product is adequate enough to withstand high voltage. However, experience shows this is an economic dance with the devil. Typical factory test procedures for medium voltage products 3. Testing and commissioning requirements for switchgear. Switchgear maintenance is usually considered a low priority by most management teams, who defer or ignore it until a failure occurs.
It will provide electricians who are new to primary testing the basic knowledge required to perform acceptance testing of the medium voltage switchgear to 38000 volts. Most importantly all measuring tools must have valid calibration certificate at the. Vlf cable test voltage ieee standard high voltage inc. Sep 28, 2018 you can find below a comprehensive switchgear testing and commissioning procedure. While doing the hv test the steps to be followed are.
Since then, field use and laboratory analysis have repeatedly proven its merits and reliability. Where applicable, testing of circuit breakers generally include. Netas 2010 outstanding acheievement award honoring netas most valuable asset. The use of service personnel from abb low voltage systems service ensures that the switchgear is installed and put into operation in a safe and correct way. Vlf cable test voltages and time durations are set by ieee standard 400. While doing the hv test the steps to be followed are as below. Instructions for installation, operation, and maintenance. Through constant innovation, we have refined cold shrink products making them better than ever. Euromold provides a complete range of accessories for underground cables. Standard test procedure for ac highvoltage power circuit breakers rated on a symmetrical current basis. Mc switchgear is compartmentalized to isolate components such as instrumentation, main bus, and both incoming and outgoing connections with grounded metal barriers. Medium voltage terminations, 5 kv46 kv over 30 years ago, 3m pioneered cold shrink technology.
Inspection, test and measurement procedures for lv and mv. Electrical switchboard switchgear testing and commissioning. Thoroughly test the switchgear at the factory with the circuit breakers in the connected position in their cubicles. If you are interested in full list of method statement for electrical testing and commissioning please. Switchgear mediumvoltage metalclad assemblies conformance test procedures. High voltage testing can be broadly classified into testing of insulating materials samples of dielectrics and tests on completed.
When you fail to conduct the proper maintenance, the risk of loss. Medium voltage switchgear shall be thoroughly tested at the factory to assure that there are no electrical or mechanical defects. We offer a medium voltage switchgear training course because medium voltage switchboards play a big role in the distribution of power and management of distribution systems. Medium voltage automatic transfer switches division 26 electrical part 1 general. Substations and switchgear in an electrical system perform the functions of voltage transformation, system protection, power factor correction metering, and circuit switching. The frequency of such tests will depend on the duty, age and condition of the switchgear. Maintenance of electrical switchgear ms28, tl4 11 chapter 1 introduction 110 purpose 111 scope this handbook contains information on safety practices and environmental considerations when working on switchgear, descriptions of typical classes of switchgear, and preventive and corrective maintenance guidelines for switchgear.
Metalclad mc medium voltage switchgear that contains drawout electrically operated circuit breakers is covered. Individual product startup procedures must be submitted and on file with startup service company. Medium voltage switchgear construction checklist page 5 of 6 version 0206 electrically operated circuit breakers exercised in manual mode electrically operated in test position and fully engaged position without main bus voltage applied all incoming cables are terminated and abc phasing is correct. Connect hv lead to pole 1 or 2, as convenient, with either pole of phase 2 and 3 grounded. Thus by suitable testing procedure we must ensure that this is done. The above information describes vlf withstand testing, where the intent of the test is to apply a sufficient test voltage for a long enough time to. The following rule is applied to the numbering of the standards. The complete guide to electrical insulation testing. Medium voltage service maintenance and refurbishment. Standard test procedure for ac highvoltage circuit breakers rated on a symmetrical current. This guide direction is prepared for related stages to the pre commissioning and commissioning of switchgear. Read and understand these instructions before attempting installation, operation, or maintenance of the switchgear assembly. This assures complete interoperability, which has been tested.
This paper covers general safe operations on medium voltage equipment and looks at the aspects of switching, isolating, testing and earthing, as well as various types of medium voltage testers and their usage. This test should be performed using a low voltage, direct current dc power supply lowresistance ohmmeter to pass current from line to load, with the circuit breaker in the closed. Switchgear and switchboard assemblies transformers, dry type, and liquid filled cables, low and medium voltage circuit breakers, low, medium, and high voltage protective relays, em, ss, and mb instrument transformers metering devices regulating apparatus grounding systems rotating machinery motor. Suggested specification for medium voltage automatic. All material can be ordered from abb kraft ab on telephone int. Switchgear testing and commissioning procedure electrical. Sep 01, 2017 switchgear system to be factory tested for all the accessories like circuit breaker, current transformer, voltage transformer, ammeter, volt meter etc.
Pdf mv switchgear inspection and test procedure find, read and cite all the research you need on researchgate. Instructions for installation and placing the switchgear into service 4. Metalclad mc mediumvoltage switchgear that contains drawout electrically operated circuit breakers is covered. It is intended as a supplement to single line diagrams and. Their correct installation, operation and maintenance can save thousands of dollars.
Electrical substations can also be divided into public and private substations. Medium voltage switchgear training course length is customizable based on your needs. Abb certified service engineers provide expert onsite installation, cold and hot commissioning for low voltage switchgear and products. Minimum voltage rating test voltage 250 v 500 vdc 6000 v vdc 5000 v 2500 vdc 39000 v 5000 vdc c overpotential testing will not proceed until insulation resistance testing is completed. Inspection, test and measurement procedures for lv and mv up to 36kv switchgears on photo eaton cutler hammer magnum ds switchgear inspection, and transformer testing for mv switchgear similar considerations apply although more extensive checks on protective devices, circuit breaker oil, vacuum bottle contact distances are required as. It is necessary that all testing tools are available before starting the work. The dielectric voltage withstand test is commonly known as the hipot test. High voltage safety operating procedures for engineers and. Square dtm medium voltage mastercladtm switchgear by. Iec 62271 is the basis of the standards of sc17a high voltage switchgear and sc17c high voltage switchgear assemblies. Oct 28, 2016 the procedure for the inspectiontesting of circuit breakers and switches is beyond the scope of this guide as each type and voltage class has its own procedure. Medium voltage switchgear ax1 is described in many different publications and even in a multimedia presentation on cdrom. Technical specification for startup and commissioning of.
Technical specification metalclad switchgear this specification covers the basic design and functional requirements medium voltage metalclad switchgear with vacuum circuit breakers and optional arc resistance. Electric switchgear testing services switchgear is an arrangement of electrical cutoff switches, fuses or circuit breakers used to regulate, guard and detach electrical gear. Because the total current depends upon the time that the voltage is applied, you can see now why ohms law r ei only holds, theoretically, at an infinite time that is, youd have to wait forever before taking a reading. High voltage switchgear has been designed according to the appropriate european standards and can be installed up to an altitude of m. For older switchgear, a condition assessment should be performed to establish that the equipment remains in a suitable condition for further service. Visual and mechanical inspection a document equipment nameplate data on test report. The medium voltage switchgear ax1 is not just a medium voltage cubicle, but also a complete switchgear systeminstallation. Conduct electrical tests on circuit breakers in accordance with ansineta section 7. From a definition point of view ax1 is a primary encapsulated and air insulated switchgear.
Potential hazards to staff, corollary damage and damage to the switchgear itself can be extremely expensive. Switchgear medium voltage switchgear solutions for primary and secondary distribution to suit every application. At higher installation altitudes, the reduced voltage endurance must be taken into account. The incredibly small size and weight of the raptor system allows the portability required for switchgear testing, being possible to place the test set closer to the switchgear panel or to breaker, and reduce the power required. Manual installation commissioning environment and recycling. Switchgear and protective devices 2015 7 p a g e 1. The current method of testing circuit breakers 05152011one of the most critical devices on any electricity network is the circuit breaker which can be described as the silent sentinel, standing guard over the network and only being called into action when. Applying voltage to the equipment and connecting to a test motor in the mv test facility. Medium voltage switchgear ax1 is described in many different publications and even in a. Low voltage training course lp management services. At many facilities, the maintenance crews take only some of the easier steps. Performed by stressing the insulation of the product far beyond what it would encounter during normal use. Electrical switchboard switchgear testing and commissioning manual from 3. Iec and ieee standards for highvoltage switchgear and.
Typical factory test procedures for medium voltage products. Sep 22, 2015 ieee standard for metalclad switchgear abstract. General descriptions of the operation and maintenance of the powlvac metalclad switchgear 3. Technical specification for startup and commissioning of new. High voltage test is done by applying 80% of factorytested voltage. This low voltage training course aids in your employees understanding of the operation, maintenance, troubleshooting and application of low voltage distribution panels and systems, which is critical for any facility.