Demonstrate the components of different voltage switchgear demonstrate the maintenance, testing procedures used for different voltage switchgear apply the safety precautions of p. Switchgear, transformers, cables, overhead lines, surge arresters, voltage transformers, current transformers, unit substations. Medium voltage operation mv drives and soft starters are temporarily installed in the mv test bay and operated on an mv dynamometer. If you are interested in full list of method statement for electrical testing and commissioning please.
Standard for testing specifications electrical power. Testing and maintenance of protective gear, protection against surgesurge absorber, surgediverter. Testing and commissioning requirements for switchgear. Power frequency withstand test voltages rated maximum voltage kv powerfrequency withstand rms kv 4. Although the test voltage is calculated from above formula but the test voltage should be limited up to that value which produces maximum 144 % of rated kvar of the capacitor unit. The following sections of the ansineta standard for acceptance testing specifications for. Lv panel testing procedure in new 2017lv switchgear testinglv switchgear panel edison world.
Tests on auxiliary and control circuits iec 62271100 7. Manufacturing process the international electrical products. Commissioning tests for hv underground cables up to 33kv swp page 5 of standard work practice sp0407 ver 16 ergon energy corporation limited abn 50 087 646 062 this test is required for xlpe and paper lead cables. Over the years testing and commissioning procedures have become more advanced and these continue to develop today, guaranteeing optimum performance of an installation and the competence and safety of those persons responsible for the operation of hv and lv systems. The training is mostly hands on testing that will be helpful in all aspects of the electrical industry. Testing of high voltage cables manual horizon power 1st edition february 20 prepared by field practices. 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. High voltage test is done by applying 80% of factorytested voltage.
Current limiting reactors in power system and their arrangement calculation of fault mva for symmetrical short circuits. This article covers testing and startup commisioning procedures for all the components of medium voltage switchgear like circuit breaker, busbars, instrument transformers currentvoltage, disconnect and grounding switches etc 1. When testing medium voltage the three point test should be adopted, test the tester on a known live source or a test box supplied by the manufacturer, test all three phases and retest the tester. Typical factory test procedures for medium voltage products. Properly planned component testing in coordination with scheduled maintenance ensures electrical protective devices operate as designed when a power anomaly occurs. Page 6 page 7 arc door existing switchboards have no internal arc withstand, human presence in front of the live switchboard is unavoidable. Then, two applications of the simplified model are discussed. You only need to change project name and insert logos etc and the same shall be ready to be submitted for approval from clients. Circuit breakers should be tested periodically to ensure operability and protection resolution. Download method statement for mv lv switchgear panel testing. S horted the cts secondary to ground and isolat ed from relays and m eters. What is the procedure for inspection and preventive maintenance and testing of circuit breakers.
Transformer bushing cts should be tested using the current. A stagewise rejective multiple test procedure based on a modified. For this reason they are required to be extremely reliable. Square d sqd full function secondary injection test set new.
Factory acceptance tests fat the routine tests shall be made with each electrical equipment and, whenever practicable. Insulation resistance testing guide chauvin arnoux. The test procedure described are applicable to metal clad switchboards. The measurement of contact resistance in breakers, busbars joints and critical connections is another common procedure in switchgear testing. Introduction the procedures stated in this document cover the activities in preliminary tests and inspections, functional performance tests and the commissioning of newly completed installations and existing ones after major alteration. Some tests and procedures may be performed by specialists during the. Applying voltage to the equipment and connecting to a test motor in the mv test facility. Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. Protective relay testing may be divided into three categories.
Ac metalenclosed switchgear and controlgear for rated voltages above 1kv and up to and including 52kv 3. The main focus of the test procedure are the following points. Electrical switchboard switchgear testing and commissioning manual from 3. Technical specification for startup and commissioning of. While doing the hv test the steps to be followed are. To verify the physical condition and proper connections of bus bar. The timing pattern of the be3200 can be synchronized to the mains generator, the external mains or derived from an internal timer. First, the equations of the mathematical model are provided. Primary injection test an intellirupter pulsecloser fault interrupter primary injection test is used to verify configured settings, time current characteristics, and test sequences.
This section specifies the furnishing, installation, connection and testing of the medium voltage switchgear. Ac power frequency overvoltage test to ascertain suitability of plant for energisation. A detailed description of construction requirements. The 2011 standard for maintenance testing specifications for electrical power equipment and systems is the most. The established documentation for the elimination and control of hazards is henceforth referred to as electrical safety procedure. Standard for acceptance testing specifications for. Our switchgear and enclosures are made of welded 304 stainless. Device testing should be completed using uptodate industry processes and testing equipment. Improve the quality control of the project and simplify the procedures for engineers. Electrical functional testing is very important and critical part of any electrical project. Our products contain no sf6 gas which is the number one greenhouse gas, and which degrades into highly toxic byproducts. Mostly primary injection test set are designed as per customers specification. 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. 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.
These methods involve measuring successive insulation resistance. Which of the procedures described below are added to your test plan will depend on the specific project or industry specifications, to be. National switchgear carries a variety of tools to help make your electrical equipment maintenance tasks easier from oems like cutlerhammer, westinghouse, eaton, general electric ge, bbc, ite, abb, siemens, allischalmers and square d and more. An improved bonferroni procedure for multiple tests of significance. Inspection, testing and commissioning of electrical. Electrical switchgear safety a guide for owners and users this is a webfriendly version of leaflet indg372rev1, published 04 introduction this guidance is for owners and operators of electrical switchgear in industrial and commercial organisations with little electrical knowledge or expertise available inhouse.
The megger insulation tester is essentially a highrange resistance meter ohmmeter with a builtin directcurrent generator. Testing and commissioning procedure for electrical installation 1. Included herein are preferred ratings, required design test procedures, and acceptance criteria. 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. This method statement covers the testing of lv cables. These instructions do not cover voltage and currentsource setup, because there are many ways to provide test current and voltage for a primary injection test. Visual and mechanical inspection a equipment nameplate data shall be documented. Megger guide to electrical insulation testing pdf instrumart. Megger low resistance testing guide pdf instrumart. Voltage drop testing is important because high resistance can prevent proper circuit operation. Where applicable, testing of circuit breakers generally include. Damage to the switchgear itself can be extremely expensive, but that pales in comparison to corollary damage and the potential hazards to people. The megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation.
To replace sf6 with air in testing with proper consideration of the differences this paper focuses on calculations of the pressure rise as result of an internal arc fault. Hipot test is the most common type of electrical safety. Applicable to tata power operating and project sites which cover but not limited to plant premises, switchyards, substations, offices. This may be the only opertunity you will ever have to dismantle a 1200 amp breaker for an inside look. All outputs and inputs of the be3200 are fiber optically isolated. Maintenance testing we recommend and provide includes the following and more. Testing of high voltage cables manual horizon power.
Conduct electrical tests on circuit breakers in accordance with ansineta section 7. Switchgear testing requires a device for accurate sequence and timing control. All workers to comply the safety requirements such as safety shoes, safety helmet, safety glasses, fluorescent vest, and safety gloves to ensure maximum ability of safe work. Nfpa standard 70e provides additional specific guidance on procedures and the level of personal protective equip. This testing and commissioning procedure is solely compiled for use on emergency generator installation in government buildings of the hong kong special administrative region. Most of the times it is necessary to hire a third party in order to conduct the function testing. Testing manual for electrical equipment requirements are fulfilled. Laboratory testing for coronavirus disease world health organization.
Carry out 500v megger test for phase to earth, neutral to earth, phase to neutral and phase to phase to measure the insulation resistance with all breakers in on positions all reading will be recorded in qc06 quality assurance test report megger. Operation testing of the generating unit from initialpowered rotation to verify suitability for operation. What is the procedure for inspection and preventive. Calibration testing primary injection test sets ges. Innovative switchgears products offer the following. System function test for switchgear and switchboards. Ieee 1248 guide for the commissioning of electrical systems. Several layers of the soft and friable insulation are wrapped around the cable in long, wide strips. The supply and primary switchgear for a large electrical installation. Inspect anchorage, alignment, grounding, and required area clearances. The sets are portable, light in weight, yet having all the technical features for testing relays and contractors.
It must be clear that the tests to be conducted as part of promotion project are mainly dc current interruption tests. Ms28 handbook maintenance of electrical switchgear tl4. Dc overvoltage test to ascertain suitability of plant for energisation. The dc voltage scale on your digital volt ohm meter dvom or digital multimeter can be used to measure the voltage drop across a load, device or conductor. Switchgear devices are constantly subjected to external influences such as dirt, humidity and temperature fluctuations. Relay testing secondary current injection test set ges. Since 1989, revised editions of the maintenance testing specifications have been published in 1993, 1997, and 2001.
However, in this document a general test procedure is presented. The test shall be carried out on a complete switchgear including its control and auxiliary circuits. Most importantly all measuring tools must have valid calibration certificate at the time of switchgear testing and commissioning of switchgear. Simes 1986 has proposed a modified bonferroni procedure for the test of an overall hypothesis which is the combination of n individual. For good insulation, the resistance usually reads in the megohm range. All testing required prior to rotating the generating unit under power hydraulic or electrical which is unique to the unit and not associated with system testing. Insulation resistance quality of an electrical system degrades with time, environment condition i. Instructions for installation, operation, and maintenance. Low voltage switchgear service installation and commissioning.
Normally, the voltage drop on the power feed side and ground side wires, connectors, and connections should not exceed 0. Learning objectives understanding the hipot test hipot test requirements hipot test considerations and failures arc detection. They can be operated and controlled by means of the builtin control panel equipped with a highresolution, resistive 7 touch screen and two function keys. The primary injections test sets are of 15 minutes on30 minutes off duty i. Inspection and test plan reference document acceptance criteria verifying document 1.
Procedure h r a 7 switchgear mechanical operation test procedure iec, nec, nema, fdf, iso ansi, ci, ipcea iec, nec, nema, fdf, iso ansi, ci, ipcea procedure h r a inspection and test plan for switchgear before manufacturing materials activity by no. Actas p260 and p360 are flexible and compact test systems for testing high and mediumvoltage switchgear devices. Paint finishing complete with pretreatment, rust proofing and final finishing in epoxy or enamel. For additional safety information and safeuse practices for your vcpw circuit breaker, refer to ib1006en table 1. Study and testing of thermal overload relay for induction motor protection 1823 5. This testing and commissioning procedure is ed and all rights including subsequent amendment are reserved. In 2005, this document was approved for the first time as an american national standard. Safety for operators, staff and visitors in front of the existing. Voltage drop testing is a simple but effective method of diagnosis to quickly locate highresistance problems in a circuit. Lv panel testing procedure in new 2017lv switchgear. Sheet steel fabrication comprising of shearing, bending, punching, arc welding and plasma cutting.
Inspect physical, electrical, and mechanical condition including evidence of moisture or corona. Manufacturer of relay testing service relay injection test set offered by ges switchgear private limited, chennai, tamil nadu. Power frequency withstand test voltages rated maximum voltage kv powerfrequency. Inspection, test and measurement procedures for lv and mv. When switchgear malfunctions, the consequences are often catastrophic. The procedure for system functional testing exceeds far beyond the scope of this document.
It mainly provides advanced highvoltage test equipment and testing instruments for power generation, substation, power supply, power consumption departments, scientific research institutions and power equipment related production and service enterprises in the power industry. New methods for switchgear test ing and analysis highvoltage switchgear equipment is located at the nodes of electrical power supply systems. Substations and switchgear inherently operate at high voltages. Lv panel testing procedure in new 2017lv switchgear testing lv switchgear panel. Calibration and testing of cts bimetals relays, protection relays etc. Functional test is to be done according to the drawings given. System function tests should be performed in accordance with ansinetaats section 8 during initial switchgear switchboard acceptance. Ul 1558 standard for metalenclosed lowvoltage power. The hipot test the dielectric voltagewithstand test is commonly known as the hipot test. Arrangement of bus bar, circuit breaker and isolator. Voltage drop testing is commonly done to check wires, connectors, and connections for excessive resistance. Duri ng normal h v test s on sw itchgear or gi s, the cts are inc luded in the h v test. Relay testing service relay injection test set manufacturer. Distance 250m 500m m 2000m cable size m 11kv or less 400mm2 250 125 60 30 185 240mm2 300 150 75 37.
The be3200 is a high speed test sequencer for switchgear applications. There are several types of voltage testers on the market. Where, v t is test voltage, v r is rated voltage of test unit, w m is maximum allowable power loss, w a is actual power loss. List of functional tests required for electrical systems. The complete guide to electrical insulation testing. Every electrician should be familiar with the operation of meggers and hipots. Thus, implementing an effective switchgear testing, inspection, and maintenance program is essential. This standard provides information essential to designing and testing of metalclad switchgear. Switchgear and switchboard inspection and testing guide. Testing and commissioning of mvhv cables example of asbestos paper insulation wrap on highvoltage cable inside an underground cable vault. Typical factory test procedures for medium voltage products 3. Electrical switchboard switchgear testing and commissioning. Guidance and standard operating procedure covid19 virus testing. The megger insulation tester is a small, portable instrument that gives you a direct reading of insulation resistance in ohms or megohms.
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