Bushing Adapter Specifications
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Questions and Answers

What is the minimum permitted bending radius for the connection cable?

  • 30 mm
  • 10 mm
  • 20 mm
  • 50 mm (correct)

    • Which of the following is NOT a characteristic of the CPU assembly?

  • Processor speed of 800 MHz
  • NVRAM with 512 kB (correct)
  • Two Ethernet interfaces
  • Application memory of 4 GB

    • What is the weight of the bushing coupling unit?

  • 3 kg
  • 1 kg
  • 1.2 kg (correct)
  • 2.5 kg

    • What is the degree of protection for the control cabinet?

    <p>IP66</p> Signup and view all the answers

    Which connector is used for the connection terminal X1?

    <p>N connector</p> Signup and view all the answers

    What is the maximum power consumption for the CP5.241 assembly?

    <p>97.5 W</p> Signup and view all the answers

    What is the permitted ambient temperature during the operation of the bushing coupling unit?

    <p>-40...+80 °C</p> Signup and view all the answers

    What is the nominal power consumption of the PS assembly with a 24...60 VDC operating voltage?

    <p>19.2 W</p> Signup and view all the answers

    Which of the following voltage ranges is permissible for the QS3.241 assembly?

    <p>85...276 VAC and 88...375 VDC</p> Signup and view all the answers

    What is the maximum total weight permitted for the control cabinet model 1500?

    <p>200 kg</p> Signup and view all the answers

    Which bushing adapter has an outer thread of M30 x 1.5?

    <p>A002</p> Signup and view all the answers

    What is the weight of the bushing adapter A005?

    <p>100 g</p> Signup and view all the answers

    Which bushing adapter features an inner thread of G¾″?

    <p>A001</p> Signup and view all the answers

    What is the permitted ambient temperature range for all bushing adapters listed?

    <p>-40°C...+90°C</p> Signup and view all the answers

    Which bushing adapter has a gasket size of 64 x 3 NBR 70?

    <p>A006</p> Signup and view all the answers

    What type of gasket is used in bushing adapter A004?

    <p>O-ring</p> Signup and view all the answers

    Which bushing adapter has the largest diameter dimension?

    <p>A006</p> Signup and view all the answers

    What degree of protection do all bushing adapters provide according to IEC 60529?

    <p>IP 66</p> Signup and view all the answers

    Which bushing adapter uses an O-ring with dimensions 14 x 2 NBR 70?

    <p>A004</p> Signup and view all the answers

    Which adapter type has an input test tap diameter of Ø 5 mm?

    <p>A007</p> Signup and view all the answers

    What is the recommended placement for grounding of the bushing coupling unit?

    <p>At the bushing's foot</p> Signup and view all the answers

    Which capacitance value is specified for the coupling unit used with bushing monitoring systems?

    <p>0.2000 microfarads</p> Signup and view all the answers

    What action is required after a red event is generated in the monitoring system?

    <p>Acknowledge the alarm</p> Signup and view all the answers

    What safety feature is included in coupling units to protect against overvoltage?

    <p>Gas discharge tubes</p> Signup and view all the answers

    What typical weight is associated with an 800 kV bushing coupling unit?

    <p>500 grams</p> Signup and view all the answers

    What is the role of the user interface in the bushing monitoring system?

    <p>Customize monitoring parameters</p> Signup and view all the answers

    What is the main component of a graded bushing that ensures a homogeneous dielectric field?

    <p>Capacitance layers</p> Signup and view all the answers

    What are the default warning and alarm limits for bushing monitoring variations?

    <p>5% and 10%</p> Signup and view all the answers

    What is a critical step after installation of a bushing monitoring system?

    <p>Conduct site acceptance tests (SAT)</p> Signup and view all the answers

    Which type of bushing is characterized by its oil content, aiding insulation but posing certain risks?

    <p>Oil-Impregnated Paper (OIP) Bushings</p> Signup and view all the answers

    Why is the separation of the bushing adapter and coupling unit important?

    <p>To avoid unnecessary stress from vibrations</p> Signup and view all the answers

    What is a significant advantage of online monitoring of bushings compared to offline measurements?

    <p>Continuous health tracking</p> Signup and view all the answers

    What characteristic distinguishes graded bushings from non-graded bushings?

    <p>Application of capacitance layers for voltage above 70 kV</p> Signup and view all the answers

    Which construction component is responsible for capacitance measurement in a bushing?

    <p>Measuring tab</p> Signup and view all the answers

    What is a key disadvantage of offline measurement methods for bushing health assessment?

    <p>Can miss rapid changes in condition</p> Signup and view all the answers

    Which bushing technology is considered more reliable and easier to handle due to its dry method?

    <p>Resin-Impregnated Paper (RIP) Bushings</p> Signup and view all the answers

    In which component of a bushing can grading foils be found?

    <p>Insulation</p> Signup and view all the answers

    What do capacitance and dissipation factor measurements indicate about a bushing?

    <p>Health of the capacitive layers</p> Signup and view all the answers

    Which component of the EOS bushing monitoring system directly connects to the bushing's test tap?

    <p>Bushing Adapter</p> Signup and view all the answers

    What is the role of the Bushing Coupling Unit (BCU) in the monitoring system?

    <p>Adapts voltage for measurement compatibility</p> Signup and view all the answers

    How does temperature affect capacitance and tan Delta values in bushing monitoring?

    <p>Both values can significantly change with temperature fluctuations.</p> Signup and view all the answers

    What is the primary advantage of the Double Reference Method in bushing diagnostics?

    <p>It neutralizes the effects of environmental variables.</p> Signup and view all the answers

    Why is it essential to secure the connection of the bushing adapter to the measuring tap?

    <p>To avoid high voltage arcing</p> Signup and view all the answers

    What is a key factor in the design of the EOS bushing monitoring system?

    <p>Minimizing environmental influences for accurate readings</p> Signup and view all the answers

    What can be a consequence of operating bushings without protective covers?

    <p>Potential equipment damage and safety risks</p> Signup and view all the answers

    Study Notes

    Bushing Adapter Technical Data

    • Bushing Adapter A001

      • Type: Micafil (RTKF, RTKG)
      • Dimensions: Ø 50 x 64 mm
      • Input: Ø 4 mm (female), Inner thread G¾″, O-ring gasket (40 x 2 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 170 g

    • Bushing Adapter A002

      • Type: HSP (SETFt 1550/420-1800, SETFt 600/123-2000)
      • Dimensions: Ø 50 x 60 mm
      • Input: Ø 4 mm (female), Outer thread M30 x 1.5, Flat gasket (26 x 35 x 2, 65 Shore)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 180 g

    • Bushing Adapter A003

      • Type: ABB (GOB 1050-750-1100-0.6-B, GSA 123-OA/1600/0.5, GSA 52-OA/2000/0.5)
      • Dimensions: Ø 40 x 82 mm
      • Input: Ø 4 mm (female), Outer thread M30 x 2, O-ring gasket (32 x 2 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 190 g

    • Bushing Adapter A004

      • Type: Trench (COT 750-800)
      • Dimensions: Ø 25 x 61 mm
      • Input: Ø 4 mm (female), Outer thread M16 x 1.5, O-ring gasket (14 x 2 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 60 g

    • Bushing Adapter A005

      • Type: HSP (multiple models including SETFt and SESTFt)
      • Dimensions: Ø 45 x 71 mm
      • Input: Ø 4 mm (female), Outer thread M24 x 1.5, O-ring gasket (22 x 2.5 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 100 g

    • Bushing Adapter A006

      • Type: PCORE (multiple standards and voltage ratings)
      • Dimensions: Ø 80 x 104 mm
      • Input: Ø 8 mm (female), Outer thread 2¼″ – 12 UNF, O-ring gasket (64 x 3 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 190 g

    • Bushing Adapter A007

      • Type: PCORE (B-81515-57-70)
      • Dimensions: Ø 40 x 60 mm
      • Input: Ø 5 mm (contact spring), Outer thread 1¼″ – 12 UNF, O-ring gasket (32 x 2 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 190 g

    • Bushing Adapter A008

      • Type: Passoni Villa (PNO, POBO, PCTO, PAO) for < 110 kV
      • Dimensions: Ø 45 x 70 mm
      • Input: Ø 8 mm (female), Outer thread 1⅛″ – 12 UNF, O-ring gasket (25 x 2.5 NBR 70)
      • Output: N female connector
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 150 g

    • Bushing Adapter A010

      • Type: ABB O Plus C (O Plus Dry)
      • Dimensions: Ø 35 x 79 mm
      • Input: Ø 9 mm (contact spring), Outer thread 3/4″ – 14 NS PM, O-ring gasket (24 x 2 NVQ 70)
      • Output: Compatible with varying requirements
      • Operating Temperature: -40°C to +90°C
      • Protection Degree: IP 66 (IEC 60529)
      • Weight: Approximately 142 g

    Bushing Coupling Unit

    • Dimensions: 117 x 100 x 60 mm (width x height x depth)
    • Input: N female connector
    • Output: TNC female connector for voltage measurement; optional for partial discharge measurement
    • Capacitance: Customizable between 0.033 µF to 4.7 µF (± 5%)
    • Output Voltage: Type (RMS): 75 V AC, maximum range noted.### Bushing Coupling Unit
    • Operating temperature range: -40 to +80 °C
    • Protection degree: IP 66
    • Weight: approximately 1.2 kg

    Connection Cable

    • Cable type: RG142/U
    • Length options: 0.8 m (Bushing adapter to bushing coupling unit), 10 m, 15 m, or 25 m (based on order)
    • Connectors: N connectors on both sides; TNC connector on one side
    • Minimum bending radius: 50 mm

    Control Cabinet

    • Dimensions for models 1200 and 1500: 779 x 1336 x 483 mm and 779 x 1647 x 483 mm respectively
    • Heating power: 100 W (1200) and 150 W (1500)
    • Input voltage: 220...240 V AC, max. 10 A
    • Protection degree: IP66
    • Corrosion category: C4 high to C5 high
    • Maximum weight: 150 kg (1200) and 200 kg (1500)

    ISM® Assemblies

    • Connection terminals:
      • X1: Max. 250 VAC
      • X10: Max. 150 VAC

    QS3.241 Assembly

    • Voltage range: 85...276 VAC, 88...375 VDC
    • Frequency: 50/60 Hz
    • Continuous power consumption: 66 W

    CP5.241 Assembly

    • Voltage range: 85...264 VAC, 88...180 VDC
    • Frequency: 50/60 Hz
    • Continuous power consumption: 97.5 W

    PS Assembly

    • Voltage range: 18...78 VDC
    • Nominal power consumption: 19.2 W (8620) and 55 W (8640)
    • Power output: 12 W (8620) and 45 W (8640)

    CPU I Assembly

    • Processor speed: 266 MHz
    • RAM: 256 MB
    • Interfaces:
      • 1x serial RS232/485
      • 3x Ethernet 10/100 Mbps
      • 1x USB 2.0
      • 2x CAN interfaces
    • Application memory: 1 GB
    • Power supply: +24 V DC (18...36 V DC)

    Interface Specifications

    • RS232/RS485 connections:
      • RXD, TXD, GND pins defined
    • USB 2.0:
      • VCC, D-, D+, GND pins defined
    • Ethernet:
      • TxD+, TxD-, RxD+, NC pins defined
    • CAN:
      • CAN-L, CAN-GND, CAN-H pins defined

    Optional Accessories

    • CAN bus: Terminating resistor required
    • Media converters available for COM2 interface with multiple options for fiber-optic cable conversions

    CPU Technical Data

    • Processor speed: 800 MHz
    • RAM: 512 MB
    • Application memory: 4 GB
    • Output capabilities: 2 isolated outputs for watchdog/error messaging
    • Nominal voltage: 24/48/60 V DC
    • Continuous current: 1 A

    UI 5-3

    • Measurement type: 3-phase
    • Standard voltage measurement: UN (RMS): 100 VAC
    • Measuring range (RMS): 19.6 to 150 VAC
    • Measuring accuracy range: -25 to +70 °C

    Session Overview

    • Fifth session of the live training series "Itos for Customers" emphasizes embedded Transformer Operating System (ITOS), focusing on bushing monitoring.
    • Co-hosted by transformer technology experts Florian Meer and Peter Shelter.

    Bushing Basics

    • Bushings facilitate high voltage and current transfer through grounded structures like transformer tanks.
    • Two primary types of bushings: graded (starting at 70 kV) and non-graded.

    Graded Bushings Explained

    • Graded bushings have capacitance layers that promote a uniform dielectric field.
    • Visual simulations illustrate the electric field stress differences, showcasing graded insulation advantages.

    Bushing Construction

    • Key components include:
      • Central conductor made of aluminum.
      • Insulation composed of grading foils and impregnated paper.
      • A measuring tab for capacitance assessment.
    • Cut-open bushing examples reveal internal structure and layer arrangement.

    Technologies in Bushing Manufacturing

    • Two main technologies for bushings:
      • Oil-Impregnated Paper (OIP):
        • Contains oil for insulation, yet poses fire and contamination hazards.
        • Widely used in distribution transformers.
      • Resin-Impregnated Paper (RIP):
        • Dry technology, offering better reliability and storage efficiency.
        • Generally more expensive than OIP bushings.

    Health Monitoring of Bushings

    • Assessment methods categorized into:
      • Offline Measurements: Highly accurate but infrequent (every several years), potentially missing rapid condition changes.
      • Online Monitoring: Continuous health tracking enabling timely offline diagnostics during detected changes.

    Key Factors in Bushing Health

    • Essential measurements include:
      • Capacitance: Indicates the health condition of capacitive layers.
      • Dissipation Factor (tan Delta): Reflects insulation quality, changing gradually; both values noted on bushing nameplates.

    Diagnostics Devices Overview

    • Diagnostics devices are essential for offline measurements which necessitate transformer shutdown.
    • Offline diagnostics differ from online monitoring, which operates continuously during transformer function.

    Online Monitoring System

    • The EOS bushing monitoring system (msense BM) consists of:
      • Bushing Adapter: Connects to the bushing's test tap for voltage detection.
      • Bushing Coupling Unit (BCU): Adapts voltage for measurement compatibility.
      • Measuring Card: Analyzes data for health assessment.

    Bushing Adapter Details

    • Adapters must accommodate various bushing types, featuring different thread lengths and pin sizes.
    • Standardized connection style across adapters; however, internal designs vary significantly.

    Safety and Voltage Concerns

    • Operating unprotected bushings can lead to dangerous conditions and equipment damage risks.
    • Adapters act in place of test tap covers to ground the bushing effectively during measurements.

    Measurement Parameters

    • Capacitance and dissipation factor (tan Delta) are critical to monitor bushing health.
    • Capacitance is a primary target, while tan Delta is more complex, suitable for critical applications.

    Temperature Influence

    • Capacitance and tan Delta values can fluctuate significantly with temperature changes.
    • Effective monitoring incorporates temperature impacts, utilizing algorithms to minimize error.

    Double Reference Method

    • Compares neighboring bushings in three-phase transformer systems to neutralize environmental variable effects, improving measurement accuracy.

    System Design and Benefits

    • The EOS system reduces reliance on additional external sensors, minimizing error sources and false activations.
    • Environmental influences like weather and operational conditions are mitigated for accurate readings.

    Bushing Adapter Installation

    • Correct fastening of the bushing adapter onto the measuring tap is crucial for safety and accuracy.
    • Variability in bushing designs may necessitate different adapters, informed by nameplate data.

    Coupling Unit Functionality

    • BCU maintains grounded resistance essential for precise measurements, calibrated to specific bushing applications.
    • Measurement setups depend on system voltage rather than just rated voltage.

    Hardware Components Summary

    • Measuring cards exist in two generations, both providing accurate voltage readings for analysis.
    • Cabinets secure data transfer from bushing adapters to measuring cards for monitoring efficiency.

    Practical Considerations

    • Follow manufacturer torque specifications during adapter installation for stable connections.
    • Understanding proper bushing adapter identification relies on manufacturers' documentation, especially nameplate details.

    Bushing Monitoring System Initialization

    • Configuration of monitoring parameters is facilitated through a user interface.
    • Bushing and coupling unit capacitance values need to be defined for accurate assessments; default alarm limits set at 5% and 10% variations can be customized.

    Commissioning and Testing

    • Site acceptance tests (SAT) are necessary after installation, as manufacturing conditions differ from real-world scenarios.
    • Standardization involves calibrating monitoring parameters to establish baseline conditions.

    Event Monitoring and Response

    • Monitoring voltage inputs is critical; fluctuations may indicate bushing issues.
    • Events categorized as yellow (warning) and red (critical alarm) require operator acknowledgment post-issue resolution.

    Redundancy and Safety Features

    • Gas discharge tubes in coupling units and adapters safeguard against overvoltage, connecting internal voltage systems to grounded housing.

    Troubleshooting

    • Missing signals or damaged wiring trigger immediate red events in the monitoring system to alert operators.
    • Offline bushing evaluations serve as effective reactive measures to address problems highlighted by alerts.

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    Related Documents

    Monitoring system MSENSE® BM Technical data PDF

    Description

    This quiz covers essential specifications of bushing adapters, including types such as Micafil and dimensions like Ø 50 x 64 mm. You'll also explore details about the test tap size and other relevant measurements. Perfect for engineering students and professionals.

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