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TRANSFORMER MONITORING FOR GENERATORS OF RENEWABLE POWERSafeguarding Your Connection to the Electricity Grid
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Total Transformer Monitoring
Safeguarding your connection to the electricity grid • p.04
The Challenge for Asset Managers • p.07
The Power of Continous Monitoring • p.07
TOTUS – Overview
A Total Transformer Monitoring Solution • p.10
Main Tank • p.12
Bushings • p.14
Tap Changer • p.15
Services
Monitoring System Services • p.16
Expert Support • p.17
Kelvatek
Contact us • p.18
CONTENTS
01
02
03
04
FOR GENERATORS OF RENEWABLE POWER, GUARANTEEING YOUR ABILITY TO SUPPLY ENERGY IS FUNDAMENTAL TO THE SUCCESS OF YOUR BUSINESS. TRANSFORMERS ARE A CRITICAL ASSET CONNECTING WIND, SOLAR AND HYDROELECTRIC GENERATION TO THE ELECTRICITY NETWORK.
12 kV
12 kV
12 kV
12 kV12 kV
12 kV
12 kV
12 kV
132 kV
132 kV132 kV 132 kV
132 kV
132 kV 132 kV 132 kV
132 kV
12 kV
132 kV 132 kV
25 38 MW 25 38 MW23 48 MW
23 18 MW
16 24 MW
11 17 MW
20 40 MW 52 44 MW 19 38 MW 43 37 MW
40 MVA 40 MVA
40 MVA
40 MVA 50 MVA 50 MVA 50 MVA 50 MVA
40 MVA 40 MVA
20 MVA
450 MVA
12 kV12 kV
132 kV12
MW
2 kV 132 kV
400 kV23 35 MW
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For generators of renewable power, guaranteeing your ability to supply energy is fundamental to the success of your business. Transformers are a critical asset in connecting wind, solar and hydroelectric generation to the electricity network. For example, an unexpected outage of a transformer can result in loss of generation from a wind field, or even the entire wind farm. Where hydro is being relied upon for backup generation when wind and solar is not available, a transformer failure means power cannot be supplied when it is needed most.
Transformers in renewable generation are often under increased pressure because of the intermittent nature of renewable power generation. And unlike typical transmission and distribution networks where power can be re-routed in the event of an asset failure, renewable generation is often located in remote locations with no backup transformer. Every transformer is therefore a critical transformer irrespective of its size.
Potential impacts of transformer failure:• Loss of revenues for the owner of the
renewable generation• Unexpected repair or replacement costs
for operators and potential liability for lost revenue
• Reduction in power supply from renewables and potentially the need to backup with fossil generation, impacting renewable generation targets for utilities.
The schematic on the following page shows a typical wind farm. Each field of 20 to 30 turbines is connected to a transformer which steps the voltage from 12kV up to 132kV. The loss of one of these transformers results in loss of power and revenues from that field. These transformers are connected to the grid with a 132kV to 400kV step up transformer – loss of that transformer results in loss of generation from the entire wind farm.
01 • Introduction
SAFEGUARDING YOUR CONNECTION TO THE ELECTRICITY GRID
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Whilst the focus for asset managers in renewable generation is rightly the wind turbines, photovoltaics or the hydro plant, an unexpected transformer outage can result in damages that can far exceed the cost of replacement. The purchase, delivery and installation of a new transformer could take several months during which time power is not being generated. Even in cases where a spare transformer is held in stock, the remote location of many renewable installations means it could take several weeks to carry out the replacement.
Typical asset management practices which may be suitable for transmission and distribution networks may not be sufficient for renewable generators. A periodic transformer oil sample sent to a laboratory for dissolved gas analysis (DGA) or an offline bushing test may show something anomalous in the results, but this provides only a snap shot in time and does not give any indication of whether a fault is getting more serious. For example, a historic hot spot event in a transformer may result in dissolved gases being present in the oil, but without context, such a measurement would normally trigger a costly site visit and inspection of the transformer, perhaps with the transformer being offline, and renewable generation lost, until that happens. Yet if the fault is not developing, the transformer could safely operate for many more years without such intervention.
THE CHALLENGE FOR ASSET MANAGERS
THE POWER OF CONTINUOUS MONITORING
01 • The Challenge for Asset Managers • The Power of Continous Monitoring
Online transformer monitoring captures sufficient data in real time to identify and classify faults, monitor how those faults are developing, understand the risk that those faults represent to the asset, and prescribe the actions, if any, to take to manage that risk.
Key challenges for asset managers responsible for transformers in renewable generation include:
• Managing multiple assets across multiple sites in multiple regions
• Gathering relevant transformer health data to make informed decisions on when to make interventions and what that intervention should be
• Cutting through the noise to see critical data
• Building a maintenance strategy that is sustainable
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TOTUS – TOTAL TRANSFORMER MONITORING
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02 • TOTUS • Total Transformer Monitoring 02 • TOTUS • Total Transformer Monitoring
TOTUS – A TOTAL TRANSFORMER MONITORING SOLUTION
More than 80% of transformer failures can be attributed to three key areas: Windings, Bushings and On-Load Tap Changer (OLTC).
The TOTUS monitoring solution from Kelvatek monitors all key components on the transformer in one system, giving a full picture of transformer health. By detecting and diagnosing problems at the earliest stagereducing the risk of failure.
Kelvatek are a complete solutions provider throughout your asset monitoring journey. Turnkey installation of the TOTUS system is partnered with long term customer support, including access to our transformer experts to answer your technical questions and share best practice information.
TOTUS TTM is the only unit to integrate DGA, Partial Discharge (PD), Bushing Monitoring (BM), Through Fault Currents (TFC) and Transformer Analytics into a single system. The result: a comprehensive, granular picture of power transformer health that allows asset managers to optimise maintenance strategies.
• Significantly reduced risk of sudden transformer failure and associated costs • Enhanced predictive maintenance to extend life of the transformer • Uninterrupted power supply, reducing unplanned outages
Advanced AnalyticsData and insights are key to driving business critical decisions about assets Partnering with customers to interpret data and deliver outputs that drive action, we work to ‘connect the dots’, linking complex data sets with actionable information. This provides a complete picture enabling informed decision making and optimised long-term transformer health.
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BUSHING MONITORING What do we monitor?
PD
Temperature
Leakage Current Angle
Leakage Current Amplitude
Capacitance
TanDelta/Power factor
High Energy Events
Load
TAP CHANGER What do we monitor?
Temperatures
Gases DGA
Moisture in Oil
Tap Position
Motor Current
TRANSFORMER MAIN TANK What do we monitor?
DGA 5 & 9 Gas
PD
TFC
Hot Spots
Temperature
Operating Condition Status
Moisture in Oil
High Energy Events
Transformer Status/Levels
Cooling Status/Temperature
TOTUS TTM
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02 • TOTUS • Main Tank 02 • TOTUS • Main Tank
MAIN TANK
Failures in transformer windings account for over 40% of transformer failures.TOTUS monitors and correlates all key components in the main tank including DGA, Partial Discharge, High Energy Events & Through Fault Current.
Early PD detection can significantly enhance a standard DGA diagnosis, driving faster and more accurate decision making. With no need for expert interpretation, our user-friendly solution uses the innovative ‘Kelvatek PD Triangle’ for quick and easy understanding of data. This data can be graphed and correlated to other parameters such as temperature, humidity, load and DGA.
Partial Discharge
Providing a full DGA profile of up to 9 Gases, TOTUS delivers cost efficient condition-based maintenance with best-in-market accuracy. Featuring embedded advanced alarm management, our dependable solutions enable more efficient maintenance scheduling for asset managers, with alerts only triggered when there is an issue with the transformer.
Dissolved Gas Analysis
One of the largest cause of transformer faults is due to external events such as through faults. Understanding which transformer is impacted in the fleet, plus visibility of the integrity of the paper insulation can help access the mechanical strength of the transformer and the risk for mechanical damages. TOTUS monitors the stress caused by through faults and cellulose ageing due to combined action of temperature, moisture and oxygen.
Through Fault Current
Acetylene is the primary marker of a high energy event. Whereas other monitors can provide basic information identifying acetylene in the transformer, TOTUS delves deeper into arcing activities, identifying the phase and winding, as well as visibility on the number of arcing events. The key benefit is the ability to correlate data and generate a deeper understanding of the transformer.
High Energy Events
FAILURES IN TRANSFORMER WINDINGS ACCOUNT FOR OVER 40% OF TRANSFORMER FAILURES.
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02 • TOTUS • Bushings 02 • TOTUS • Tap Changer
TAP CHANGER
Failures in tap changers account for over 20% of transformer failures, often resulting in fire or explosions.
TOTUS offers a range of solutions for all OLTC types starting from simple tracking of temperatures and tap position up to providing a full 8-gas DGA monitor.
Arcing, heating, mechanical frictions and wear are the key factors leading to OLTC failures. While the condition of tap changer can be assessed with regular testing, this is often time-consuming and costly for asset managers.
TOTUS monitors and integrates key parameters on the tap changer such as tap position, motor current and temperatures to highlight deviations over time, enabling enhanced maintenance strategies for asset managers.
By online monitoring of the tap position, OLTC temperature, Dissolved Gas Analysis and motor torque and load, asset managers can detect anomalies at the earliest stage and plan proper action and testing. This means more efficient maintenance, also allowing time periods between maintenance to be lengthened.
TOTUS monitoring provides the following key benefits for asset managers;
• Use of diagnostic standards for DGA
• Continuous monitoring and supervision detecting early faults
• More efficient maintenance, reducing costs (through condition based maintenance)
• Integrated solution with Main Tank DGA and Arcing (same web platform, data correlation
BUSHINGS
A bushing failure can be a catastrophic event resulting in widespread collateral damage:
• Bushings contribute to 15-30% of transformer failures globally
• Approximately 30% of generator step-up transformer failures are cause by bushing malfunction
• Over 40% of bushing failures resulted in catastrophic consequences such as fire, tank rupture and explosions
Bushing monitoring in the TOTUS solution combines integrated intelligence and analytics to provide reliable and intuitive information to asset managers about bushing health.
Online monitoring of bushings with TOTUS allows asset managers to detect faults at their very earliest stages and take action before the fault reaches a critical or irreversible level. TOTUS monitors and correlates key parameters including:
• Partial Discharges
• High Energy Events
• Leakage Current Angles and Magnitude
• Temperature
• Load
• Bushing Properties
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MONITORING SYSTEM SERVICES
To ensure the success of our customers’ asset monitoring programmes, we offer a focused services and support programme. Every customer has a dedicated project manager, whose role is to ensure all aspects of projects are aligned to our customers’ core business needs. Our field co-ordination teams work with you to ensure all onsite requirements are met, including custom product configuration and detailed planning and scheduling.
When starting a journey with a customer we focus on 3 key principles:
• Define: We work with you to define your business needs and expectations
• Deliver: We deliver to your expectations on time and when expected
• Drive: We ensure your monitoring technology is driving value for your business
EXPERT SUPPORT
Our partnership with you does not end when the unit is installed. We ensure that you always have access to the latest improvements in asset monitoring technology. Our goal is to provide you with the tools you need to solve problems and access knowledge in real time about your assets.
By partnering with Kelvatek for your transformer monitoring solution, you get much more than just an analyser. You get access to decades of transformer expertise already built into our transformer analytics tools as well as one-on-one expert support through our customer support platform.
Developed in partnership with our customers, our Support Portal hosts a wealth of real-time information covering assets, work orders and technical support cases. Our customers can chat live with their dedicated Kelvatek Agent, get answers to questions in real time and access our knowledge centre for key learnings and information on best practice.
We don’t simply fit, finish and forget: we are here to support you throughout your asset monitoring journey.
03 • Services • Monitoring System Services 03 • Services • Expert Support
Pre Installation Check
Installation & Commissioning
Post Installation Review
Our field co-ordination team will work with you to conduct site surveys
and information including on-site specifics, logistics,
transformer details and collect all relevant
information for bespoke hardware
We will confirm all hardware has been
received and provide detailed scheduling
covering scope of work with our tech coordinator and field service engineer who will be attending the
installation
Our team will work with you on installation and
commissioning planning. Programmes are built to fit your needs. We
can train your teams to complete installations, or we can manage the entire
programme.
The Kelvatek aftersales team will reach out and
check you are happy with the installation and
commission service. We’ll ensure the unit is
performing and enquire on any additional actions or
requests.
Site Survey
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For over two decades, Kelvatek has been working collaboratively across the UK & Irish Energy industry to accelerate network performance and drive a more sustainable future. We provide industry leading solutions and services for Fault & Load Management, Asset Monitoring and Biogas & Gas Monitoring.
Data – and the insight it provides – drives everything we do. The powerful insights we deliver from our clients’ data allow them to maximise returns from current network investments, make strategic decisions, deliver improved customer outcomes and embrace the opportunities of net zero. The data we collect is transparent and open, putting Network Operators firmly in control of their networks.
We exist to engineer better futures. You’ll see that commitment reflected in initiatives to make our operations more sustainable, and to help our customers on their own journey to net zero.
Kelvatek is part of Camlin, which has a worldwide presence with facilities in 21 cities across 17 countries. Camlin’s goal is to optimise the critical infrastructures that people, cities and communities around the world depend on, all day and every day.
KELVATEK
04 • Kelvatek • Contact Details
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Head OfficeKelvatek Ltd
31 Ferguson DriveKnockmore Hill Industrial ParkLisburn BT28 2EXNorthern Ireland
+44 (0)28 9262 6989
kelvatek.com
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Whilst every effort has been made to ensure that the information given is accurate, Kelvatek reserves the right to change any of the details or specifications in this document without prior notice and disclaims liability for any editorial, pictorial or typographical errors.
TOTUS Total Transformer Monitor
