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Disconnects and Switches

Disconnects and Switches
25問 • 1年前
  • Maxwell Nemir
  • 通報

    問題一覧

  • 1

    When preforming switch maintenance it is important to always do what?

    pay close attention to measurements and tolerances

  • 2

    Most load-break switches are not designed or rated to do what?

    close on a faulted circuit

  • 3

    With power fuse technology the fuse effectively “snuffs” the arc by what action?

    drawing the arc through an arc quenching chamber

  • 4

    Before opening or closing any disconnect, switch or circuit breaker it is important for the technician to understand what?

    what the operation will do electronically

  • 5

    A ground switch would likely be used on which of the following actions?

    on a parallel transmission line to bleed off induction

  • 6

    Some switches are equipped with arcing horns that are intended to do what?

    to protect the contact surfaces of the switch

  • 7

    When associated with a piece of equipment, disconnects are typically referred to as:

    dedicated switching units

  • 8

    When needed, operating linkage should be adjusted with what?

    the switch closed

  • 9

    Immediately after operating a manual gang switch it is important to always do what?

    visually check to see that all three phases are completely closed or completely open

  • 10

    Drop-out fused disconnects are designed so that when the fuse blows and the barrel drops open, which of the following is provided?

    an indication of a blown fuse and a total air gap isolation of the faulted equipment

  • 11

    What should be done prior to bypassing the regulator

    adjust the regulator to the neutral position and turn the motor controller off

  • 12

    Switches should have name plates which would include which of the following

    continuous current rating

  • 13

    The majority of single-pole disconnects have what?

    no current interruption rating

  • 14

    Disconnects and switches serve what purpose in a substation?

    to isolate equipment

  • 15

    There are several differences between disconnects and switches. Which of the following statements is incorrect?

    switches are not rated to make or break load

  • 16

    Often the first sign that an insulator has flashed over is what?

    rust on galvanized top plates where burns have damaged the zinc galvanizing

  • 17

    Which of the following should be done to a hot stick prior to operating a disconnect?

    wipe down the stick with a clean absorbent cloth

  • 18

    Load-break attachments can more effectively allow the switch to preform which of the following functions?

    de-energize a current transformer

  • 19

    Gang operated switches are what?

    mechanically linked together to operate simultaneously

  • 20

    When operating a manual gang switch, how should it be operated?

    the handle should be operated with smooth continuous flow

  • 21

    The manufacturers grease associated with power fuses provide which of the following two functions

    it prevents oxidation and fills imperfections on the contact surfaces

  • 22

    Hook operated fused disconnects are typically used for what purpose

    smaller power transformer protection at voltages from 34 kV to 115 kV

  • 23

    Portable load-break tools are sometimes used where?

    on longer transmission lines

  • 24

    What is the transfer bus typically used for?

    to reroute the power when the breakers need to be maintained

  • 25

    When preforming maintenance on disconnects it is important to do what?

    make sure the contacts are alinged properly and cleaned

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    問題一覧

  • 1

    When preforming switch maintenance it is important to always do what?

    pay close attention to measurements and tolerances

  • 2

    Most load-break switches are not designed or rated to do what?

    close on a faulted circuit

  • 3

    With power fuse technology the fuse effectively “snuffs” the arc by what action?

    drawing the arc through an arc quenching chamber

  • 4

    Before opening or closing any disconnect, switch or circuit breaker it is important for the technician to understand what?

    what the operation will do electronically

  • 5

    A ground switch would likely be used on which of the following actions?

    on a parallel transmission line to bleed off induction

  • 6

    Some switches are equipped with arcing horns that are intended to do what?

    to protect the contact surfaces of the switch

  • 7

    When associated with a piece of equipment, disconnects are typically referred to as:

    dedicated switching units

  • 8

    When needed, operating linkage should be adjusted with what?

    the switch closed

  • 9

    Immediately after operating a manual gang switch it is important to always do what?

    visually check to see that all three phases are completely closed or completely open

  • 10

    Drop-out fused disconnects are designed so that when the fuse blows and the barrel drops open, which of the following is provided?

    an indication of a blown fuse and a total air gap isolation of the faulted equipment

  • 11

    What should be done prior to bypassing the regulator

    adjust the regulator to the neutral position and turn the motor controller off

  • 12

    Switches should have name plates which would include which of the following

    continuous current rating

  • 13

    The majority of single-pole disconnects have what?

    no current interruption rating

  • 14

    Disconnects and switches serve what purpose in a substation?

    to isolate equipment

  • 15

    There are several differences between disconnects and switches. Which of the following statements is incorrect?

    switches are not rated to make or break load

  • 16

    Often the first sign that an insulator has flashed over is what?

    rust on galvanized top plates where burns have damaged the zinc galvanizing

  • 17

    Which of the following should be done to a hot stick prior to operating a disconnect?

    wipe down the stick with a clean absorbent cloth

  • 18

    Load-break attachments can more effectively allow the switch to preform which of the following functions?

    de-energize a current transformer

  • 19

    Gang operated switches are what?

    mechanically linked together to operate simultaneously

  • 20

    When operating a manual gang switch, how should it be operated?

    the handle should be operated with smooth continuous flow

  • 21

    The manufacturers grease associated with power fuses provide which of the following two functions

    it prevents oxidation and fills imperfections on the contact surfaces

  • 22

    Hook operated fused disconnects are typically used for what purpose

    smaller power transformer protection at voltages from 34 kV to 115 kV

  • 23

    Portable load-break tools are sometimes used where?

    on longer transmission lines

  • 24

    What is the transfer bus typically used for?

    to reroute the power when the breakers need to be maintained

  • 25

    When preforming maintenance on disconnects it is important to do what?

    make sure the contacts are alinged properly and cleaned