OILTP A
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Questions and Answers

What should be checked for wear when inspecting the locking pawl and catch flange?

  • Electrical connectivity
  • Compression strength
  • Alignment accuracy
  • Impact point (correct)

    • Which components are essential to retrofit when replacing the resistor connecting plates?

  • Connecting leads between angular pieces (correct)
  • Current cables
  • Contact rollers
  • Pressure springs

    • In the maintenance inspection of a switching element, which of the following is NOT listed to be checked?

  • Resistor condition
  • Contact rollers movement
  • Impact resistance (correct)
  • Contact wear

    • What is necessary for the proper functionality of the energy accumulator?

    <p>Adjusting the tension of locking pawl spring</p> Signup and view all the answers

    What is a critical step in maintaining the switching cylinder?

    <p>Checking locking pawl tension spring</p> Signup and view all the answers

    What is the minimum residual value for movable contact wear in the new condition for type B?

    <p>2 mm</p> Signup and view all the answers

    For the C350 type, what is the fixed contact wear residual requirement?

    <p>8 mm</p> Signup and view all the answers

    In the context of OLTC components, what does 'SC' stand for?

    <p>Single Contact</p> Signup and view all the answers

    Which type has an adjustable entry requirement for diameter wear?

    <p>V200 14 pitches</p> Signup and view all the answers

    What is one additional wear criterion listed for V350/500/700 except with 14 pitches?

    <p>Individual wear</p> Signup and view all the answers

    Which type has a diameter entry in mm that states 'none'?

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

    What is the designated residual requirement for SC and TC movable wear for C250?

    <p>2 mm</p> Signup and view all the answers

    Which entry reflects individual wear in the provided data?

    <p>C350</p> Signup and view all the answers

    For type V350/700, what is the residual for fixed contact wear?

    <p>5 mm</p> Signup and view all the answers

    What does the 'TC' designation represent in the OLTC context?

    <p>Terminal Contact</p> Signup and view all the answers

    What is the minimum residual value for the movable contact wear for type C350 in mm?

    <p>10.5</p> Signup and view all the answers

    Which type has a fixed contact wear specified as 'none'?

    <p>V200 - except with 14 pitches</p> Signup and view all the answers

    What is the entry for individual wear listed under type C250?

    <p>individual wear</p> Signup and view all the answers

    For the type V350/700 with 14 pitches, what is the residual minimum value for both movable and fixed contacts?

    <p>5Ø</p> Signup and view all the answers

    Which of the following types has a specified diameter wear of 6Ø under SC criteria?

    <p>V200 14 pitches</p> Signup and view all the answers

    What does the notation '∗' signify in the context of the content provided?

    <p>Special conditions apply</p> Signup and view all the answers

    How should the entry for the V350/700 be recorded, according to the information provided?

    <p>Refer to V__09001.doc (TS Manual)</p> Signup and view all the answers

    Which type has a residual minimum value for the fixed contact wear of 10 mm?

    <p>C350</p> Signup and view all the answers

    In the context of individual wear, what is the specified minimum value for SC contact wear for type B?

    <p>3</p> Signup and view all the answers

    Which type has all categories of contact wear for both movable and fixed specified?

    <p>C350</p> Signup and view all the answers

    What is the purpose of the document TCS06004?

    <p>It details the maximum admissible contact wear.</p> Signup and view all the answers

    Why was TCS06004 replaced?

    <p>Due to corrections for V200 14 pitches.</p> Signup and view all the answers

    What type of information is likely included in the summary of maximum admissible contact wear?

    <p>Specific wear limits for various OLTC types.</p> Signup and view all the answers

    What would be an expected feature of the CST09001en.xls document referenced?

    <p>It provides a list of all OLTC types and their specifications.</p> Signup and view all the answers

    What aspect of OLTC contacts is primarily addressed in the summary?

    <p>The dimensions and maximum wear allowed for the contacts.</p> Signup and view all the answers

    What is the specified minimum value for individual wear under type D 21000?

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

    Which type has a consistent value of 6 across all categories for individual wear?

    <p>D 0466</p> Signup and view all the answers

    For the type F 23000, what is the specified diameter entry for individual wear?

    <p>2.5</p> Signup and view all the answers

    What is the stated fixed contact wear for type F 24000?

    <p>7</p> Signup and view all the answers

    In the context of individual wear, which type specifies a diameter entry of 'none'?

    <p>D 20000</p> Signup and view all the answers

    What value is noted for individual wear under type F 26000 for the movable contact?

    <p>3</p> Signup and view all the answers

    Which of the following types has a specified individual wear of 4.5?

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

    For type D 20000, what is the indicated individual wear value for both movable and fixed contacts?

    <p>9.5</p> Signup and view all the answers

    What must be removed to lift the selector switch insert in a tap changer type A delivered before August, 1976?

    <p>The eight M6 nuts</p> Signup and view all the answers

    How far can the contact cylinder drop when modifications are made to a tap changer type A?

    <p>Up to 3.5 mm</p> Signup and view all the answers

    What is required for the maintenance work if a reversing change-over selector is not installed?

    <p>It must be held by the felt ring</p> Signup and view all the answers

    What does the term 'narrow nut' refer to in the context of the tap changers mentioned?

    <p>A component installed under the ring</p> Signup and view all the answers

    Which delivery date marks the division between tap changer modifications being necessary or not?

    <p>6 August, 1976</p> Signup and view all the answers

    What is a consequence of removing the eight nuts from the tap changer type A?

    <p>The selector switch insert can be lifted</p> Signup and view all the answers

    Which of the following is true about the version of tap changers delivered after August, 1976?

    <p>No changes are needed for maintenance</p> Signup and view all the answers

    What happens to the contact cylinder without a reversing change-over selector during a drop?

    <p>It can drop until it is supported by the felt ring</p> Signup and view all the answers

    What is the part number of the serrated lock washer needed for modifying the attachment of the contact cylinder?

    <p>451 363</p> Signup and view all the answers

    How many hex head screws are required for the modification of the contact cylinder attachment?

    <p>2</p> Signup and view all the answers

    What should be checked for the condition of the tap-changer head?

    <p>Seal tightness</p> Signup and view all the answers

    What modification is not required if the tap changer type A was delivered after August 1976?

    <p>Modifying the contact cylinder attachment</p> Signup and view all the answers

    What is used to secure the locking ring during maintenance if a change-over selector is present?

    <p>Spring cam</p> Signup and view all the answers

    For type A, what is the minimum residual value for fixed contact wear in mm?

    <p>2</p> Signup and view all the answers

    When modifying the attachment of the contact cylinder, what is the purpose of installing the M6 nut?

    <p>To secure components together</p> Signup and view all the answers

    What is the specified residual minimum value for fixed contact wear for type C350?

    <p>8</p> Signup and view all the answers

    What should be checked regarding the toothing on the crown wheel and pinion during maintenance?

    <p>Flank clearance</p> Signup and view all the answers

    What does the part number 10 755 correspond to in the context of this maintenance?

    <p>Delivery date of a specific OLTC</p> Signup and view all the answers

    For type V200 with 14 pitches, what is the residual minimum value for movable contact wear in mm?

    <p>4Ø</p> Signup and view all the answers

    What does the 'SC' designation refer to in the context of the wear criteria?

    <p>Specific Contact</p> Signup and view all the answers

    Which type has a minimum diameter wear specified as 'none'?

    <p>Type C350</p> Signup and view all the answers

    Under which type is the individual wear criterion noted as applicable?

    <p>Type C250</p> Signup and view all the answers

    For type M, what is the residual requirement for fixed contact wear?

    <p>4</p> Signup and view all the answers

    What is the minimum residual value for movable contact wear in the new condition for type C250?

    <p>4.5</p> Signup and view all the answers

    Which OLTC type has a residual value for movable contact wear indicated as 6Ø?

    <p>Type V350/500</p> Signup and view all the answers

    What is the fixed contact wear residual minimum value for type B?

    <p>1.5</p> Signup and view all the answers

    The document TCS06004 was replaced due to corrections for V200 14 pitches.

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

    Maximum admissible contact wear applies only to fixed contacts in OLTC types.

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

    CST09001en.xls is a replacement document for TCS06004.

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

    OLTC types have specified dimensions of contacts in millimeters.

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

    The summary of maximum admissible contact wear includes information on the installation of tap changers.

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

    If safety instructions are not observed, there is a risk of personal damage or injury.

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

    The removal of the diverter switch insert is optional for maintenance of the tap-changer.

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

    Work performed by sufficiently qualified personnel eliminates risks associated with malfunction.

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

    Only general knowledge is required to perform maintenance on the on-load tap-changer.

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

    Risk of damage to property only arises from malfunctioning equipment, not from personnel errors.

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

    There is no need to read the safety instructions carefully before starting work.

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

    The risk of personal damage can be mitigated by following safety and hazard information provided.

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

    Maintenance and operation of the tap-changer require basic training rather than specialized knowledge.

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

    The specified diameter entry for individual wear under type K is listed as 8,5.

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

    For type G 21000, the total wear is indicated as 6 mm.

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

    Individual wear for type F 26000 is noted as 6 mm.

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

    The entry for individual wear under type G 22000 has a total wear requirement of 6,5 mm.

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

    If end inspection is not available, further inspection instructions are provided for type R.

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

    The total wear value is specified as 13 mm for type G 22000.

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

    The total wear for type G 22000 is greater than or equal to 13 mm.

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

    The designated value for fixed contact wear for type D 20000 is not specified.

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

    Type T and R has a minimum wear value entry of 6 mm for both movable and fixed contacts.

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

    Type C250 has all categories of contact wear specified for both movable and fixed contacts.

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

    The individual wear entry for type K is noted as 8.5 for both movable and fixed contacts.

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

    There is no individual wear specified for type F 26000.

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

    The document mentions that switching contact is abbreviated as 'SC'.

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

    The minimum value for fixed contact wear in type C250 is specified as 10 mm.

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

    Type G 21000 has an individual wear entry of 7 for fixed contacts.

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

    Inspection instructions for type R are not referenced in the provided content.

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

    The locking pawl and catch flange must be checked for cracks at the impact point.

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

    Replacing the contact rollers is unnecessary if they are out-of-round.

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

    Energy accumulators do not require inspection for locking pawl tension springs.

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

    Current cables and pressure springs must be checked as part of the maintenance inspection.

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

    Retrofitting resistor connecting plates is optional during maintenance inspections.

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

    The documentation reserves all rights according to standard DIN 34, section 2.2.

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

    The parts list includes a brush under the part number 090783:00.

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

    The current take-off terminal is labeled with the part number 021475:02.

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

    The guide bar is represented by the part number 021525:01 in the spare parts list.

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

    A set of small parts includes only screws and nuts.

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

    The individual wear value for type D 21000 is consistently 11.5.

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

    Type F 24000 has a specified value of 1 for both movable and fixed contact wear.

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

    For type F 23000, the diameter entry for individual wear is noted as 2.5.

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

    The indicated individual wear for type D 20000 shows a movable contact wear value of 4.

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

    Type E shows an individual wear value of 1.5 for all categories.

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

    The individual wear for type D 0466 is listed as having a value of 6 for all categories.

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

    Type D 20000 specifies 'none' for the diameter entry.

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

    The individual wear entry for type F 26000 shows a value of 9.5 for the movable contact.

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

    Tap changers type A delivered after August 1976 require modification to the attachment of the contact cylinder.

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

    The contact cylinder of tap changers type A can drop approximately 3.5 mm when the eight M6 nuts are removed.

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

    Narrow nuts are installed under ring 049 563:01 for all tap changers type A delivered until August 1976.

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

    A reversing change-over selector is essential to hold the contact cylinder in place after modifications.

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

    The modifications for tap changers type A are unnecessary for maintenance tasks conducted after August 1976.

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

    The delivery date of OLTC No. 10 755 is 6 August 1976.

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

    During maintenance on a tap changer type A, it is mandatory to lift the selector switch insert with the narrow nuts still installed.

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

    Once the eight M6 nuts are removed, the contact cylinder can drop until it rests on the reversing change-over selector flange.

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

    For type D 21000, the specified individual wear value is 8.5.

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

    The specified individual wear for type F 24000 is consistent across all categories.

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

    The individual wear value for type D 0466 is 7.

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

    For type F 23000, the stated fixed contact wear is 7.

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

    The minimum residual value for movable contact wear in the new condition for type A is 23 Ø.

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

    Type F 26000 has a movable contact individual wear value of 2.5.

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

    Type V350/500 has a specified individual wear of 6 Ø under SC criteria.

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

    Individual wear values for type E are listed as uniform across all categories.

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

    The fixed contact wear for type C350 is specified as 10 mm.

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

    Type B has a maximum allowable wear of 3 mm for fixed and movable contacts.

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

    All categories of individual wear for type F 21000 are marked as 8.

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

    The individual wear entry for type D 20000 includes a value of 9.5.

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

    The diameter entry for V200 with 14 pitches is noted as 20 Ø.

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

    Type C250 has no residual minimum value for fixed contact wear specified.

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

    The notation '∗' indicates that there are additional criteria not specified.

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

    The minimum residual value for type V350/700, with 14 pitches, is 6 mm for both movable and fixed contacts.

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

    Type M has equal values of 8 for all categories of contact wear.

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

    The criteria for individual wear for type F 24000 are not specified.

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

    Study Notes

    Admissible and Minimum Residual Values

    • The table provides the minimum residual values of a switchgear/switch cylinder based on different types and configurations.
    • The table considers "new condition" values, "movable" and "fixed" conditions for both SC (switching cylinder) and TC (take-off contact).
    • The "minimum residual values" column reflects the measured wear in millimeters for both "movable" and "fixed" components.
    • The "additional wear criterions" column indicates whether individual wear or addit. admissible wear applies.
    • The "entry in SAP documentation" column provides reference information for the specific wear types.

    Switchgear and Switch Cylinder

    • The table contains references to various types of switchgear including: A, B, C250, C350, V200, V350, V500 and V700.
    • The table refers to different types of diverter switch inserts: type G 22000, type R, and type T.

    Contact Wear Categories

    • The "contact wear" in mm is measured for "movable" and "fixed" components, including SC and TC.

    Additional Wear Criterions

    • The "additional wear criterion" column states whether individual wear applies.
    • It also indicates whether addit. admissible wear applies.

    SAP Documentation

    • The table provides SAP document numbers and information for specific wear types.
    • For example, "see TS284043.1 (TS Manual)" for addit. admissible wear under "M".
    • Additionally, "see V__09001.doc (TS Manual)" for "V350/500/700 - except with 14 pitches" and "V350/700 14 pit".

    Assemblies

    • The document provides details about various assemblies including:
      • Energy accumulator, gearbox
      • Supporting cylinder, supporting bars, coupling shaft and switching column
      • Transition impedance and protective circuit
      • Oil compartment

    Maximum Admissible Contact Wear

    • Contact wear is an important factor affecting tap changer performance.
    • This document provides guidelines for the maximum permissible wear of contact elements in various tap-changer types.
    • It includes information about different types of tap changers (A, B, C250, C350, V200, V350, etc.) and their specific wear limits.
    • The "admissible" wear is defined as the maximum wear permissible before replacement is required.
    • The document details the wear limits for both movable and fixed contacts in mm.
    • It categorizes the wear limits based on the OLTC type, diverter switch type, and the contact element's location (SC for side contact, TC for top contact).
    • Additional wear criterions are also provided for specific tap-changer types, indicating individual wear limits for different contact points.
    • The document highlights a change in wear specification for V200 with 14 pitches, indicating a new maximum wear limit for this specific model.
    • It emphasizes the importance of checking the contact wear frequently to ensure optimal tap-changer operation.
    • The document recommends consulting specific documents (like TS manuals) for individual wear details and maintenance information for different tap-changer models.

    ### Tap Changer Modifications

    • The document focuses on the modification of the attachment of the contact cylinder for tap-changer type A.
    • The modification involves the use of serrated lock washers and nuts to securely fasten the contact cylinder.
    • This modification applies to units delivered before August 1976.
    • It emphasizes that the modification is not necessary for subsequent maintenance.
    • The document provides detailed instructions and drawings for performing the contact cylinder attachment modification.
    • It lists the necessary materials and part numbers for the modification process.

    ### Tap Changer Assemblies

    • The document highlights the importance of regular maintenance and inspection of tap-changer assemblies.
    • It focuses on the following parts:
      • Tap-changer head with cover
      • Contact system and switching element
    • The document outlines specific checks that should be performed on these assemblies, like:
      • Seal tightness of tap-changer head
      • Tooth condition on crown wheel and pinion
      • Checking for crack formation and wear on wind-up cam, tripping cam, and drive flange
      • Installing locking ring with spring cam for change-over selector, if not already installed

    Additional Information

    • The document includes a reference to a replacement for the document TCS06004en.
    • It indicates that the new document (CST09001en.xls) incorporates a correction for V200 with 14 pitches.
    • The document's purpose is to provide an overview of the maximum admissible contact wear for different tap-changer models.
    • It serves as a guide for maintenance technicians and operators to ensure proper tap-changer functionality and longevity.
    • It emphasizes the importance of regular maintenance and inspection to prevent failures and ensure safe operation of the tap-changer.

    On-load Tap-Changer (OLTC) Maintenance

    • OLTC Types
      • T and R: Max. wear on contact sheet F26000 is 34mm for end inspection and 22mm for additional contact sheet. 6mm total wear.
      • G 21000: Max. total wear on guide bridge is 7mm, see TCS05012.doc for additional contact sheet. 6mm total wear.
      • G 22000: Max. total wear on guide bridge is 6.5mm if total wear is 13mm. See TCS05012.doc for additional contact sheet. 6.5mm total wear.
      • K: Max. total wear on individual wear is 8.5 mm, total wear is 1.5mm. 7mm total wear.

    Assemblies

    • Switching Cylinder

      • Check the locking pawl tension spring and catch of the drive flange for cracks.
      • Check the locking pawl and catch flange's impact point for wear.

    • Switching Element

      • Check contact wear and ensure contact rollers move freely.
      • Replace worn or out-of-round contact rollers.
      • Check resistors, porcelain body, and resistor connecting plates.
      • Replace or retrofit resistor connecting plates with the new shape.
      • Ensure connecting leads between both angular connecting pieces are installed, or replace if necessary.
      • Check current cables and pressure springs.

    Order Information

    • 3 unit order via SETERSATZ, order ID 004185:06
    • 3 pieces (A III) of order
    • Slider 1 piece, order ID 021530:05
    • Guide bar order ID 021525:01
    • Set of small parts (screws, nuts, lock tab) order ID 088995:00
    • Brush 1 piece, order ID 090783:00
    • Terminal 1 piece, order ID 703892:02, oil compartment
    • Current take-off terminal 1 piece, order ID 021475:03, pressure-tight from 01.02.97 on

    Documentation Notes

    • Documentation reserves all rights according to standard DIN 34, section 2.1.

    Spare Parts Note

    • Spare parts tests, replacements, and retrofits must be considered in addition to instructions.

    Step-by-Step Parts Replacements

    • Parts replacement intervals listed on spare parts list
    • One-time retrofit and modifications listed

    Contact Cylinder Modifications

    • Instructions to modify attachment of contact cylinder of tap changers type A
    • If tap changer type A delivered before approximately August, 1976 ( delivery date of OLTC No. 10 755: 6 August, 1976), no nuts installed under ring 049 563:01
    • During maintenance ring must be removed to lift selector switch insert
    • Contact cylinder (with reversing change-over selector) can drop approximately 3.5 mm when 8 nuts are removed.
    • If no reversing change-over selector, contact cylinder can drop further until held by felt ring in dirty oil vessel.

    Versions with and without narrow nut.

    • Version without reversing change-over selector and without narrow nut in Figure 1.
    • Version without reversing change-over selector and with narrow nut in Figure 2 (not shown).

    Admissible Wear

    • Wear criterions for contact with diverter switch inserts type G 22000, R, T
    • Minimum residual values are provided for both movable and fixed SC and TC components.
    • Additional wear criterions provided with SAP documentation references.
    • Contact wear values also provided for both movable and fixed SC and TC.
    • Wear values for contact cylinder types A, B, C250, C350, V200, V350/500/700, M, D 20000, D 21000, D 0466, D 0444, E, F 21000, F 23000, F 24000, F 26000 with references to relevant documents in the TS manual.

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    Description

    Explore the minimum residual values of switchgears and switch cylinders in various conditions and configurations. This quiz covers wear measurements, additional wear criteria, and provides insights into different switchgear types and diverter switch inserts. Test your understanding of contact wear categories and their implications.

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