Buddheshwar Kumar Vaish

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Tan Delta Testing of 4 MW / 11kV Motor For a 4 MW, 11 kV motor, the Tan Delta (Dissipation Factor) test is performed to check the insulation quality. This test ensures that the motor's insulation is in good condition and has not degraded due to factors like age, moisture, or contamination. Here’s the step-by-step procedure, voltage setting, and connection diagram for the Tan Delta test. 1. Test Voltage Set Point for Tan Delta Testing For an 11 kV motor, the typical test voltage applied during a Tan Delta test should be 1 to 1.5 times the rated line-to-line voltage. Voltage Set Points: Rated Voltage of Motor: 11 kV Test Voltage for Tan Delta Test: Typically, around 12 kV to 15 kV (1.1 to 1.5 times the rated voltage) is applied. It is good practice to start at a lower voltage and gradually increase up to the maximum test voltage. 2. Testing Procedure Equipment Required: Tan Delta Testing Kit (such as Megger, OMICRON, etc.) High Voltage Power Supply (up to 15kV) Shielded High Voltage Test Leads and Ground Leads Personal Protective Equipment (PPE) (insulated gloves, safety shoes, face shield) Procedure: Preparation: Isolate the Motor: Ensure the motor is completely isolated from the power supply (disconnect breakers or isolation switches). Visual Inspection: Check the motor for any visible signs of damage, such as cracks or moisture. Ensure the motor windings are dry and clean. Discharge the Motor: Make sure the motor windings are completely discharged of any residual voltage. Connection Setup: Connect the high-voltage lead from the Tan Delta test kit to the motor winding you want to test (for example, phase A). Connect the ground lead from the test kit to the motor casing (ground point). Use the guard lead to connect any external metal structures or other parts to eliminate stray capacitance from the measurement. Test Voltage Application: Start by applying a lower voltage, such as 1 kV. Gradually increase the voltage in steps, typically 1 kV, 2 kV, 5 kV, 10 kV, up to 12 kV or 15 kV. Monitor and record the Tan Delta (dissipation factor) values at each voltage level. Measurement of Tan Delta: At each test voltage step, the Tan Delta kit will measure the dissipation factor, which represents the ratio of the resistive current to the capacitive current in the insulation. As the test voltage increases, the Tan Delta value should remain stable or show a slight increase. If there is a sudden rise in Tan Delta with increasing voltage, it indicates insulation deterioration. Repeat the Test for Other Phases: After testing Phase A to ground, repeat the process for Phase B and Phase C to ground. Optionally, perform phase-to-phase testing by connecting two phases and grounding the motor frame. https://lnkd.in/gPFVJNPD

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What are important parts of power transformer? ANS: Primary winding connected to the AC source Secondary winding connected to the load Main Tank Conservator Tank OLTC Bushing (LV /HV) Breather with silica Gel/Heater Oil Cooling fans Radiator Pump Mechanical Protection ( Buchholz, PRD, WTI, OTI)

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#Low-Tension CT (LTCT) Metering of Transformers: Low-tension CT (LTCT) metering of transformers is a critical aspect of electrical energy measurement and management in power distribution systems. Here is an basic exploration of LTCT metering, including its components, working principles, installation requirements, calibration procedures, and applications in transformer monitoring and efficiency enhancement. #Components of LTCT Metering System: 1.CTs are essential components in the LTCT metering system, responsible for transforming primary current to a proportional secondary current suitable for measurement by meters or monitoring devices. 2.Multi-function meters are used to measure various electrical parameters such as current, voltage, power, energy, and power factor. These meters receive inputs from CTs to provide real-time data on transformer performance. 3.The metering panel houses CTs, meters, wiring connections, and protection devices, providing a centralized point for monitoring and managing transformer operations. Working Principle of LTCT Metering System LTCT metering operates based on the principle of electromagnetic induction, where primary current passing through the CT induces a proportional secondary current. The secondary current is then directed to the metering panel, where multi-function meters process the data to calculate various electrical parameters, including energy consumption and power quality. #Installation Requirements for LTCT Metering: 1.CTs should be installed in series with the transformer primary winding to capture accurate current readings. 2.Wiring connections between CTs, meters, and protective devices should be secure, insulated, and of adequate capacity to handle the currents being measured. 3.Before commissioning, thorough calibration and testing of CTs and meters should be conducted to ensure accuracy and reliability of measurements.Calibration of CTs and meters is essential to maintain measurement accuracy over time. Periodic calibration procedures involve comparing meter readings with known standards, adjusting for any discrepancies, and documenting calibration results for traceability and compliance with regulatory standards. #Applications of LTCT Metering in Transformer Monitoring: 1. LTCT metering provides insights into transformer loading patterns, helping utilities optimize load distribution and prevent overloading. 2.Accurate measurement of energy consumption facilitates efficient energy consumption. 3. Abnormal current or voltage readings from LTCT metering system can indicate faults in the transformer or downstream distribution. Low-tension CT metering of transformers is a critical component of modern power distribution systems, offering utilities valuable insights into transformer performance, energy consumption, and system efficiency...

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Greeting All, We have excellent career opportunity for Manager / Sr Manager for Renewable industry based at Andheri (east), Mumbai. Qualifications & Exposure: 1. Networking, Supplier/ Contractor Relationship Management, Keeping up-to-date with Industry, Knowledge of Product Upgrade / Technology Changes 2. Well-versed with contractual clauses and Legal aspects pertaining to Procurement & Supply Chain domain 3. Managing Negotiations for Better Deals, Problem Solving, Data Analysis and Presentation, Written & Verbal Communication Skills 4. Proficient in handling BGs, NDAs, Supplier / Contractor Invoices Verification as per Contract / Order, and Payment Outstanding 5. Conversant with ERP software such as SAP HANA/ Ariba & procurement tools/ software for conducting auctions 6. Bachelors degree in Engineering (Mechanical/ Electrical/ Civil) 7. Successful track record of 10 to 12 years in Procurement / Sourcing / Materials Management with minimum 4-5 years of experience in handling procurement of WTG 8. Extensive knowledge of the Indian renewable Wind energy market. Responsibilities: 1. Formulate and drive all strategic initiatives towards the goal of achieving long-term partnerships with WTG OEMs 2. Execution of RFIs, RFPs/RFQs and any necessary bid process to evaluate product options and select the right WTG OEM for a given project or set of projects. 3. Manage negotiations regarding WTG supply contracts (MOU, LTSA, WTG Supply/ Warranty/ O&M contracts, etc.) 4. Develop a close network with all wind industry players and stakeholders having an impact on business, including current and potential entrant OEMs (provide strategic market intelligence). 5. Manage entire Procure-to-Pay Process Prepare and Release RFP, Obtain Quotes, Negotiate, Prepare Techno-commercial Evaluation and Comparison Statement, Recommendation, Note for Approval, Contract/ Purchase Order/ Work Order Preparation & Closure. 6. To monitor Budget v/s Actual expense and circulate MIS regularly (Weekly) for monitoring of WTG procurement activities and sharing the same with senior management 7. Settle issues with Supplier/ Contractor viz. payment reconciliation, debit note, implementation of penalty clauses, risk purchase clauses etc. 8. Work collaboratively with Engineering, Projects, Finance & Accounts, Legal, and Construction teams to understand cost targets, project timelines, compliance aspects and related constraints Key Skills: 1. Strong communication skills. 2. Strong Business Acumen 3. Collaboration with internal and external stake holders 4. Result orientation If you would be interested in this opportunity, kindly share your updated resume on below mail id [email protected] "Request you to spread this message in your network (friends or colleagues) who are suitable for similar job. Thanks & Regards Farha Sayyed

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