Transformer commissioning test. 0 COMMISSIONING: 5. The consumer must provide certain data to the utility at the earliest stage of the project. These Tests are done to check the transformer is installed correctly and its in good working conditions that meets with the required standards and specifications. Sep 20, 2022 · 1. The only problem is that there is increasingly less and less time in which to do this. This article continues the series of articles dedicated to the erection, testing and commissioning of MV/HV switchgear by describing the most important precautions and recommendations in various procedures and steps. . On secondary side, star point of the current transformers are to be earthed at one point. No-load losses and currents. Unludagy Electric Power System Abstract This paper reviews the advantage of performing transformer through-fault test in substation testing and commissioning prior to the Magnetic balance test of transformer in Hindi/ Transformer Testing: https://www. 2 Bushings. Sep 7, 2009 · Transformer differential protection application has always been a challenge to protection engineers and commissioning personnel, even with older electromechanical and solid state technologies. ABB certified service engineers provide expert on-site installation, pre-commissioning tests to ensure a correct installation has been performed and commissioning tests on protection relays and/or communications for switchgears, modular substation packages, eHouses, distribution NETA certified technicians and field engineers offer start-up testing, commissioning, maintenance, acceptance testing and 24-hour emergency electrical field service Saber Power Field Services has one of the most comprehensive field service teams in the industry, with NETA certified technicians and an extensive fleet of company-owned medium and Employ proper commissioning covering pre and cold commissioning, start-up, hot commissioning, start of production, performance test and acceptance of plant Carryout megger testing and substation grounding system Discuss the qualifications of testing organizational and personnel covering the division of Sep 26, 2017 · Power transformer installation and pre-commissioning testing is predominantly undertaken by our highly skilled installation teams utilising specialised processing and latest test equipment. (Bill) Bergman, IEEE - Calgary / Edmonton 18 Mar 15, 2020 · A transient simulation test signal can represent in frequency content, magnitude and duration, the actual input signals received by a relay during power system disturbances. Calibrated DC hi-pot test set for cables with leakage current indicator and overload protection. By the way, we offer measurements for transformers not only during commissioning, but also during maintenance or inspections. Detectable Failures: – Shorted winding sections or turns. Mr Lee Wai Meng shares some of his experience in the protection of transformers, through a case study. , B. This test usually must be done by a trained technician. 4. Calibrated AC hi-pot test set for switchgear with leakage current indicator and overload protection. com/watch?v=4hZNF15CHRM&list=PLm5DfcJ2fuqTl-4zuw8TLNvEXY-ZYX_4o&inde May 16, 2021 · Home / Technical Articles / Performing power factor test on dry-type transformer during commissioning Power factor test The power factor test is a maintenance test used to determine the insulation system dielectric power loss by measuring the power angle between an applied AC voltage and the resultant current. 90-2021, p. We can keep this transformer in operation all the 24 hours a day 13-14 May 2011 Fig. 12. THESE RULES MUST BE FOLLOWED FOR ALL TEST PROCEDURES. Our team has years of experience in power transformers testing and commissioning. Tests during pre-commissioning don’t neccessarily operate the euipment as a system yet. d) If the transformer is aged or refurbished and the wiring has The checklist also addresses the critical role of secondary circuits, emphasizing the need for proper wiring, sizing, and grounding of current transformers (CTs) and voltage transformers (VTs). 1 Power- and large distribution transformers. Safety protocols, step-by-step instructions, and testing methods ensure optimal operation and industry standards compliance. China +86 791 835 0800 +86 791 835 0814 Customer: Customer Address: Contact Person: Telephone: Mobile phone: Fax: Email: Substation Testing and Commissioning: Power Transformer Through Fault Test M. Power transformer testing Power Transformer Factory Test using IEEE Standards Waldemar Ziomek CG Power Systems Canada IEEE Training, Houston, Texas, Oct. This test allows the engineer and relay technicians to Transformer Testing. These instrument transformers are specifically designed to convert high primary currents into lower secondary currents, enabling their utilization with meters, relays, control equipment, and various other instruments. Connect the Transformer (Fuse unit) to the Incomer Unit. Oct 18, 2023 · Power transformer testing and commissioning are critical stages in ensuring the reliability, safety, and optimal performance of power transformers in electrical networks. The transformer testing performed before commissioning the transformer at the site is called the pre-commissioning test of the transformer. Consequently, safeguarding transformers against various faults becomes paramount. Insulation Resistance Up to size 500KVA transformer is called Distribution transformer. A number of tests are presented for use in determining the significant parameters and performance characteristics of electronics transformers and inductors. Avoid multiple earth for differential circuits. May 2, 2024 · Pre Commissioning Test of Transformer. Transformer Commissioning Procedure: 5. The results of those tests are depicted in the report together with technical analyses. / BE Electrical : CV Model, Example Resume Objective : Site / Construction, Installation Engineer / Commissioning Engineer Jan 30, 2017 · compliance of the transformer, the non-unit and unit type protection for the transformer, and the cable joints. This article will go through complete testing that needs to be done at the site during the commissioning process of the transformer. Nov 15, 2020 · Transformer Testing | Transformer Test and their ProcedureFor confirming the specifications and performances of an electrical power transformer it has to Testing and commissioning precautions. Cast Resin type Transformer Pre-Commissioning Test: Prior to energizing the transformer, several pre-commissioning tests are done. It is important to follow the proper testing procedures to identify issues and ensure that any problems are addressed promptly. 1 After the satisfactory completion of installation, the following pre-commissioning checks, and tests on instruments must be performed before putting the transformer into service. By accurately transforming and scaling current measurements, CTs Nov 15, 2022 · It is also a routine IEEE test performed on all newly manufactured transformers. Perform an excitation test on transformers used for relaying applications in accordance with ANSI/IEEE C57. To perform this test, a voltage “greater-than-rated volts per turn to the transformer” (IEEE C57. 1. 3™-2014 “IEEE Guide for Grounding of Instrument Transformer Secondary ircuits and ases” 2019-02-11 / 2019-02-12 W. Jul 12, 2024 · By engaging ABB, you can be assured your switchgear is installed and put into operation in a safe and correct way. We have carried out the various types of jobs, which included Supply and Erection of H. Dec 21, 2023 · Transformers function as essential equipment in power systems, allowing electrical energy to be transmitted and distributed. 9. Voltage transformer tests. Indication: – Buchholz relay tripping OLTC repair. This comprehensive procedure is performed to ensure that the transformer operates safely and efficiently, meeting industry standards and Feb 8, 2021 · Power transformers testing and commissioning at the site (instructions and precautions) Pre-commissioning checks and tests of high voltage current transformers (CTs) Practical steps in the design of a substation grounding The secondary injection test is typically performed during the commissioning phase of a new CT installation. After testing with high voltage, test terminals must be grounded before being touched by any personnel. Photo: TestGuy. 1 PURPOSE: 5. The dummy fuse should have a rating of more than 100 A & no resistance. The test results are temperature-corrected to a reference temperature of 20°C. 10 Buroh Street, #02-07 West Connect Building, Singapore 627564. All materials and relevant documentation to this testing works shall be checked by the responsible personnel prior to the commencement of testing activities. Scope of the Testing and Commissioning Works 2-4 3. It describes important checks to perform before testing, including ensuring proper earthing and oil levels. An electrical test can entail any of the following: Insulation resistance test; Winding resistance test; Conduct a Polarity test; Use principal injection for ratio testing; Magnetizing current test Aug 30, 2022 · Go back to Commissioning tests ↑. A primary part of commissioning a transformer involves testing it after its installation in the field. It Rating plate show nominal voltage, current of primary and secondary voltage at various of the tap changer, connection symbols ( vector group), % impedance weight of oil etc. Visually inspect the CT for any damage, cracking, or oil leaks. Outdoor type – Live tank, Oil cooled. 3061890 - Standard for Minimum Commissioning Test Requirements and conf Feb 8, 2021 · Power transformers testing and commissioning at the site (instructions and precautions) Pre-commissioning checks and tests of high voltage current transformers (CTs) Practical steps in the design of a substation grounding This paper reviews the advantage of performing transformer through-fault test in substation testing and commissioning prior to the actual energization in addition of theory of testing and numerical procedure. A failure in a power transformer leads to power supply disruptions and instability in the electrical power system within the network. To be able to carry out these tests properly, it is important to develop Apr 3, 2019 · Figure 4 – Transformer no-load current and no-load loss measurement. 3 Functional Performance Tests 3. Test IR value of each bushing with a 500V Megger. Pad Mounted Transformer CSA C227. R. Earthing. Safety is emphasized, with all tests to be performed with the equipment de-energized and Commissioning Procedure Of Power Transformer In Transformer testing it can be classified into power and distribution transformers. Jan 17, 2023 · The transformer temperature rise test is normally included in the type test of the transformer. Address: Telephone: Telefax: 3088 Zi Yang Avenue High-Tech Development Zone 330096 Nanchang Jiangxi, P. It describes preparing test equipment like a multimeter, test block, cables, and supply. Current and voltage transformers are vital components in an overall protection technology system. The types of testing we undertake when commissioning new installations are all carried out to the relevant BS standards and recognised industry standards. Th e transformer is one of the most important items of hardware in the electrical power system. Various pre‐commissioning checks and tests are performed to ensure the healthiness of the power transformer prior to its energization. Jayam Engineering Services are able to provide highly skilled and experienced office and site based management personnel, to successful execute the clients requirements. 2 Test Witnessing Commissioning Report - 1 COMMISSIONING REPORT Manufacturer: ABB Tellhow generators Ltd. 1 Permission to Test. T. (maximum anticipated power demand (KVA), layout plans and elevations showing location of proposed substation, degree of supply continuity required from the information provided by the consumer), the power-supplier must indicate: Apr 3, 2023 · hi viewersIs video me transformer ke pre commissioning Test discuss kiye hai . 2909674 (P53) Operate the Network Enterprise Process . Transformers may be tested using AC or DC voltage. 4 National Standard of Canada . Perform a ratio-verification test using the voltage or current method in accordance with ANSI/IEEE C57. Insulation resistance and continuity of the winding should be checked by 1000V Megger 3. Commissioning – Testing of current and voltage transformers . This document provides a test sheet for commissioning non-MPS distribution transformers up to 1,000 kVA. Sep 7, 2020 · Pre-commissioning is complete once you’ve completed all your checklist and verified that each piece of equipment meets the technical requirements of the project. Aug 29, 2023 · This power transformer testing is done during the manufacturing phase but also during pre-commissioning and throughout the transformer’s service life. What is IEC 60076 for power transformers? IEC 60076 covers the design, manufacturing, testing, and commissioning of power transformers for both indoor and outdoor use. 2. The standard specifies the requirements for the insulation, cooling, protection, and testing of power transformers. 8 KV, 34. Nov 2, 2020 · Commissioning is an opportune time to demonstrate the proper functioning of current and voltage transformers. May 29, 2024 · This instruction manual comprises a complete description of the testing and commissioning of various electrical equipment installed in power substations. Sep 20, 2022 · The scope of electrical testing as part of pre-commissioning is normally limited by the capabilities of portable test equipment, which is understood to mean test equipment which can easily be transported to site in a car or light van and can be powered from a standard LV AC supply. Such a rigorous approach to power transformer testing addresses issues ranging from insulation integrity and winding resistance to temperature tolerance and core losses. The guidelines stress the importance of This document provides a checklist for pre-commissioning tests of individual equipment in a primary or grid substation. Polarity check of voltage transformer. contact@aetsg. Pre Commissioning test are done before connecting the transformer to the electrical system. Clean the bushings and check that there are no hair cracks or other damages. 1. POWER TRANSFORMER TESTING . 5 KV & 132 KV. Procedures are given for vector group checks by connecting phases and measuring voltages. Prior to commissioning work, for specific help and information on the accessories supplied Testing Power Transformers. Being a power transformer commissioning company in UAE and Egypt, We ensure proper testing and commissioning of power transformers to enhance the grid's longevity and reliability. Feb 11, 2021 · There are several electrical tests that can be done on transformers as part of commissioning and regular maintenance. These tests are designed primarily for transformers and inductors used in all types of electronics applications, but they may apply to the other types of transformers of large apparent-power rating used in the electric power utility industry. 9. For remote areas or transformer sites around the world, we will usually send a site supervisor to ensure the stringent systems for product assembly are Employ proper commissioning covering pre and cold commissioning, start-up, hot commissioning, start of production, performance test and acceptance of plant Carryout megger testing and substation grounding system Discuss the qualifications of testing organizational and personnel covering the division of NETA certified technicians and field engineers offer start-up testing, commissioning, maintenance, acceptance testing and 24-hour emergency electrical field service Saber Power Field Services has one of the most comprehensive field service teams in the industry, with NETA certified technicians and an extensive fleet of company-owned medium and the subject of commissioning testing of protection systems, this report is intended to strictly focus on provid ing recommendations on commissioning testing . For each equipment, it details the specific tests that should be conducted to ensure proper functioning before From an economic perspective, power transformers are among the most costly equipment found in substations. b) If the transformer is new and HV testing has not been verified as satisfactorily completed at the manufacturer’s works – HV withstand test. Testing and Commissioning Procedures 4-26 4. 233 – 2009, the objective of commissioning tests are to evaluate the Sep 26, 2017 · Power transformer installation and pre-commissioning testing is predominantly undertaken by our highly skilled installation teams utilising specialised processing and latest test equipment. Voltage transformers require testing for polarity, ratio and phasing. Current transformer tests. The no-load losses of a transformer are grouped in three main topics: Iron losses at the core of the Feb 15, 2024 · The potential transformer (PT) testing procedure ensures the accuracy & reliability of voltage measurement instruments. Oct 2, 2019 · It should be ensured that whole testing equipment along with testing procedures are available at testing site. ” Commissioning of Distribution Transformer Before actually charging the transformer the following points should be checked: 1. Test leads should be properly screened/ shielded. Feb 9, 2024 · Current Transformer (CT) Commissioning Test Visual Check. We are proud to have our own advanced testing equipment to carry out necessary testing of the transformers and to get the work done quickly on our own. The voltage is applied to the HV winding of the transformer so that power input is equal to no-load losses plus load losses corrected to a reference temperature of 75oC. We also carry out ETC for AIS as well GIS substations. Nov 19, 2018 · A guide to surge arrester selection, application, maintenance and testing. The purchase, preparation, assembly, operation and maintenance of transformers represent a large expense to the power system. Inspect transformer and parts for shipping damage and moisture. This course is designed to provide electrical engineers and professionals with in-depth knowledge and practical insights into various aspects of power transformer stability testing, led by an experienced industry expert, Trainer Introduction: Figure 1 – Incoterms 2020. Go back to Contents Table ↑. Note details of Bushings in the “Commissioning Report. 5. Indoor type – Cast resin. High Voltage/ Medium Voltage System Testing & Commissioning. We undertake the following High Voltage/ Medium Voltage System Testing & Commissioning but not limited to. Basic Transformer Measurements 1. We should not utilize the rated fuse provided by the manufacturer. com. To test the fuse unit, we need a dummy fuse. High voltage transformers are some of the most important (and expensive) pieces of equipment required for operating a power system. 2928929 Standard for Maintenance Acceptance Criteria (MAC) 2947196 - Commissioning Tool Voltage Transformer . 2 Statutory Test and Inspection 3. Each procedure includes the task, preconditions (work Status, needed documentation, involved personnel and measuring instrument used for testing), precautions, testing scope and execution Apr 17, 2024 · 4). c) If the transformer is aged or refurbished and minimal wiring changes have occurred – No HV withstand test. Critical Checks: Key operational tests during commissioning involve tap changer functionality, relay tests, and cooling system verification. An important consideration in Testing & Commissioning Engineer Gujarat, Installation of panel, transformer and cable laying & termination, Testing and commissioning of all Electrical equipment, Inspection of control and relay panel, preparation of Test Report for power plant. Testing must be carried out in presence of testing engineer only. Talebi, Member, IEEE, Power Grid Engineering Y. The following tests are routinely conducted in the field on the transformer: - Excitation current test May 8, 2022 · 1. Sep 11, 2019 · Testing and commissioning procedures. To do the above sequence test, turn on the breaker for the transformer and incomer units. J. Services offered in Power Transformers Testing & commissioning ; Offline Testing No HV withstand test. Testing will commence only after the equipment is completely installed as per approved method statement for the installation of the Transformer and released for testing commissioning. Transformer and reactor testing, especially dielectric testing, is potentially destructive. Pre-commissioning tests the equipment as a stand alone item. 1 Preliminary Steps for Testing and Commissioning Works Erection, Testing, and Commissioning (ETC) for transformers is a crucial process that involves the careful installation, thorough testing, and successful integration of transformers into the power system. We therefore need to consider how the transformers and the protection system can be adequately tested within a reasonable timeframe. E. After commissioning, secondary current measurement shall be carried out in CT circuits. Transformer installation 2. Go to Content ↑. MR provides the equipment and the service technicians. 4 Documentation and Deliverables 4. These documents serve as quality control measures and outline the specific testing requirements for primary May 31, 2024 · A detailed Transformer Site Testing and Pre-Commissioning Method Statement guide for transformer readiness and performance. Diagnostic testing and monitoring will help you to determine your asset's condition and choose the right corrective measures to ensure reliable operation The document provides guidelines for testing and commissioning power transformers. Installation and commissioning should preferably be performed by the supplier or in close cooperation with the supplier. For remote areas or transformer sites around the world, we will usually send a site supervisor to ensure the stringent systems for product assembly are accepting the transformer, including reading out the impact recorder; testing the transformer; For testing transformers of every power class, we have the necessary equipment from renowned metrology device manufacturers. It should be 100 M ohms or greater. Impedance testing We work across all voltage levels like LV,MV,HV and EHV. In conclusion, dry type transformer testing and commissioning are critical steps in ensuring the proper working and safety of the transformer. Test Method: An AC source is connected to each phase of the HV winding with all other windings open-circuited. For the type test of transformer, it is essential to follow the international standards such as IEC or ANSI, which provide guidelines on how to conduct tests to verify a transformer’s design and manufacturing against its Mar 8, 2023 · Testing and commissioning procedures: Checking the winding resistance of CT, PT and CVT; CT ratio check; Ratio test of CVT and PT; Knee point voltage test (KPV Test) of current transformer; Surge monitor testing; SF6 circuit breaker testing; Transformer winding resistance; Transformer testing; Transformer oil testing Transformers - Part 1: Current Transformers (Includes CSA C13) •IEEE Std 57. Before commissioning a protection scheme, it is recommended that the following features of current transformers are May 12, 2017 · Current transformers (CTs) are essential components in the monitoring and protection of electrical power systems. We are offering Control Relay Panel Commissioning. ) Another responsibility of Commissioning Engineer is to create Inspection and Test Plans and Test Reports. Advance Engineering & Testing (AET) Pte Ltd. The voltage transformer polarity can be checked using the method for CT polarity tests. Rosh Engineering has extensive knowledge and experience in the testing and commissioning of power transformers over a wide range of size and voltage class. Training Designed for: This course is intended for Electrical and Mechanical/Power Engineers, Project Engineers, Maintenance Welcome to the comprehensive online training on Power Transformer Stability Testing. HV, MV and LV Switchgear: Relay, CB, CT, VT and Transformer Testing & Commissioning at Onshore & Offshore; Splicing & Testing of HV Cables 13. It emphasizes the use of suitable wiring materials, shielding for control and instrument cables, and appropriate color coding to ensure clear Apr 29, 2024 · Site selection of substation. Key electrical tests are outlined, such as ratio testing, vector grouping, no-load current, short circuit current, insulation testing, and winding resistance. 10. Apr 4, 2014 · Perform a polarity test of each current transformer in accordance with ANSI/IEEE C57. Note:-As far as is practicable , primary injection test ( ratio test) should be final test done on the current transformers, after which no secondary connection should be disturbed. Following is an approximate sequence for transformer testing: 1. Go back to contents ↑. so watch this video and gain your elec Dec 3, 2016 · Potential / Voltage transformers Testing and Pre-Commissioning Check Potential /Voltage transformers can be broadly divided in to two type : Indoor and outdoor type. youtube. 2 days ago · Figure 1 – Testing and commissioning engineers in action of testing power transformer at night (photo credit: Warna RS Sdn. 1™-2006 “IEEE Guide for Field Testing of Relaying urrent Transformers” •IEEE Std 57. The process involves a Jan 4, 2024 · Draw an oil sample from the bottom of the tank and test it for Breakdown-Voltage (BDV). It outlines visual inspections, insulation resistance testing, energization of the transformer without load, voltage and phase rotation testing, phasing tests, and energization of the LV network. An essential phase in the installation process, the Pre-Commissioning Test of Transformers includes a series of testing and evaluations aimed at providing the transformer’s reliability, functionality, and safety before it becomes operational. Electrical Commissioning Test. It is therefore important that the transformer is not just seen as a one -off piece of equipment, but is always tested as part of the complete system. Surge arresters are voltage-limiting devices used to protect electrical insulation from voltage spikes in a power system. ye sare test one by one explain kiye hai. diagnostic tests and commissioning of the transformer and preventive maintenance practices. Go back to Tests ↑. It is also carried out when modifications are made to the CT secondary wiring to ensure that the changes do not affect the CT’s performance or introduce any errors. AC voltage is preferable to DC voltage for transformer testing because AC voltage simulates the internal stress that the transformers face during operating conditions. Apr 27, 2024 · The core of transformer testing involves a systematic approach to both type test of transformer and commissioning test. Similar to how a fuse functions to protect an electrical system from damage due to overcurrent conditions, the role of a surge arrester is to safeguard the system from damage caused The document provides instructions for testing procedures on a power transformer. 3. com Feb 24, 2012 · Pre-Commissioning Tests: These include insulation resistance tests and checks on winding resistance and ratios to ensure the transformer meets manufacturing and safety standards. It lists 7 types of equipment - power transformer, 33kV circuit breaker, 33kV CRP panel, 11kV switchgear, CT testing, VT testing, and protection relays. sg Commissioning a test for a differential protection scheme for a three-winding transformer Figure 1: Single line diagram. Installation, commissioning and decommissioning of transformers with all associated testing. Care must be taken to connect the battery supply to the primary winding, with the We are one who involved in the testing and commissioning of power systems and testing Laboratory for carrying out Condition Monitoring tests on Power Equipments, Pre-Commissioning Tests and Commissioning of power generating stations, Captive power plants, EHV sub stations upto 400KV, HT and LT Installation and DG sets Testing, Generators, HT Jun 9, 2018 · Normally, the measurements are made while the supply voltage is increased at equal intervals from 90% to 115% of the transformer rated voltage (Un) and this way the values at the rated voltage can also be found. It usually includes insulating resistance testing, ratio & polarity tests, phase angle measurements and burden tests. Our specialist test equipment used to test the new installation is calibrated to BS EN ISO 10012: 2003 on an annual basis. These terminologies hold significance in grasping the fundamental concepts related to current transformer operation and evaluation. 13. 8-9, 2014 Power transformer testing 2 Power Transformer Factory test •Objective of tests •Classification of tests •List of tests •Connections for test •Details of Tests During commissioning and operation it is essential that your power transformer is in good condition. It is therefore recommended that the specification states that no testing should take place without the user or purchaser being informed or giving their permission. Winding resistance measurement. This paper reviews the advantage of performing transformer through-fault test in substation testing and commissioning prior to the actual energization in addition of theory of testing and numerical procedure. Bhd. This test allows the engineer and relay technicians to validate all the CTs and PTs secondaries, transformer winding configuration, protective relays and wiring correctness and circuit Get in touch. Portable versions are used to measure the insulation power factor of transformers in the field. Substation, LV/MV/HV Switchgear Circuit Breakers, Transformers, Relay Testing VOLTAGE TRANSFORMER TESTING SWP 2902800 Substation Primary Plant and Secondary Systems Field Testing SWP . Transformer should be inspected by authorized electrical inspector and get permission to energize the same 2. Power transformers are the prime component in power transmission networks. These can be of electromagnetic of capacitive voltage transformer type (CVT). Like applied potential testing, this particular test is currently not included among the list of tests performed on reconditioned transformers. It details insulation checks between windings and earth, and ratio checks by applying voltages and measuring ratios. Power transformers testing and commissioning at the site (on photo: Transformer dynamic resistance measurements with the Omicron's CPC 100) See full list on electrical-engineering-portal. Various influences can impact the expected lifetime throughout a transformer's lifecycle. Before proceding with transformer measurements the test engineer will become familiar with the safety rules of Section 2. Winding resistance measurement shall be performed when the windings are at ambient temperature without supply for a time long enough to achieve this condition. Commisioning Test. This amounts to a rigorous examination of the transformer intended to: 1) uncover problem(s), if any, with the transformer’s components, as a transformer is exposed to great stresses on its journey to site and is vulnerable to moisture To comprehend the commissioning of current transformers, it is vital for protection engineers to familiarize themselves with specific terminologies employed during primary injection testing. As discussed in IEEE C37. Our range of testing services includes commissioning of newly manufactured and installed transformers, condition monitoring and time-based asset testing, through to fault investigation and With key experience in the testing and commissioning of GIS switchgears, power transformers, protection and control systems, substation auxiliary equipment, fiber optic cable splicing and generation equipment, AT&C is committed to provide benchmark services to its clients Jun 29, 2015 · The Doble Test Set is designed specifically to carry out this test. As you already know, substations are the points for controlling the supply of power on different routes by means of various equipment such as power transformers, circuit breakers, CTs/VTs, compensating equipment, isolators, etc. 1 Tests and Inspections during Construction 3. 1 Winding Ratio. itqjmkffcikxxpjcfrwnprondmndlutxothmxoalaskwlyg