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Substation Year 3 lvl 3 > Terminations > Flashcards

Terminations Flashcards

1
Q

What does terminating a shielded power cable mean?

A

To terminate the cable’s insulation shield (metallic shield and underlying semi-conducting layer)

It does not mean to end the cable itself.

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2
Q

What are the two common methods for dealing with shielded cable ends?

A
  • Installation of terminations
  • Separable connectors (elbows)
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3
Q

What is the purpose of preparing the cable by removing the shielding layers?

A

To contain the medium or high voltage electrical field

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4
Q

What can occur if the electrical field at the cut-back edge of the semi-conducting shield is too concentrated?

A

Partial discharge, or corona

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5
Q

What is the dielectric strength of air compared to that of cable insulation?

A

Air: 76 volts per mil; Cable insulation: approximately 800 volts per mil

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6
Q

What is the current industry standard for terminations?

A

IEEE Standard 48

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7
Q

What does the Class 1 Termination provide?

A

The best protection for the cable

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8
Q

How is the Class 2 Termination classified?

A

As a switchgear termination

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9
Q

What is the primary function of stress control in terminations?

A

To reduce the electrical stress concentrated at the edge of the cut-back semi-conducting shield

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10
Q

What are the two common methods for providing stress control?

A
  • Stress cone
  • Capacitive stress control material
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11
Q

What is the traditional method of stress control?

A

Stress cone

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12
Q

What advantage do capacitive methods of stress control provide?

A

Distribute voltage stresses over a larger area

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13
Q

What functions does a termination’s insulator provide?

A
  • Tracking protection
  • Basic lightning impulse insulation level (BIL) protection
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14
Q

What materials are preferred for the insulator to prevent tracking?

A

Inorganic materials, such as silicone rubber

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15
Q

What is a skirted insulator used for?

A

To contribute to the termination’s tracking resistance

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16
Q

What does BIL stand for?

A

Basic lightning impulse insulation level

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17
Q

What is required for a termination to qualify as a Class 1 Termination?

A

It must provide a seal to the external environment

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18
Q

What types of seals are used in terminations?

A
  • Potting compound
  • Tapes
  • Cold shrink tubes
  • Heat shrink seals
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19
Q

What should a termination provide regarding grounding?

A

An external ground connected to the cable shield at the base of the termination

20
Q

What basic information is essential in the termination selection process?

A
  • Cable type
  • Voltage rating
  • Conductor size
  • Installation environment
  • Other factors
21
Q

What are termination installations referred to as?

A

Live-front connections

22
Q

Name common types of terminations.

A
  • Tape termination
  • Cold shrink termination
  • Heat shrink termination
  • Push-on termination
  • Pothead termination
23
Q

One function that an IEEE Class 1 Termination provides is electrical stress control for the cable shield terminus.

24
Q

An IEEE Class 1 Termination does not provide a seal to the external environment and must be sealed with two layers of tape.

25
One function that an IEEE Class 1 Termination provides is ? between the high voltage conductor and ground.
External leakage protection
26
Three problems that are associated with a non-shielded termination include ? ,
Mechanical support Electrical connection of the conductor Physical protection of the cable insulation
27
A(n) ? gradually increases the total thickness of insulation from the edge of the semi-conducting shield out to a certain point on the cable’s insulation.
Stress cone
28
The two functions of a termination insulator are to provide BIL protection against ?
Flashover damage Tracking
29
In addition to the termination’s voltage stress, two conditions are necessary for tracking.
Contamination Moisture
30
The two best insulator materials for providing cable tracking protection are
Silicone rubber Porcelain
31
The upper level at which a termination can withstand surges, such as lightning surges, is known by the initials ? .
BIL
32
The upper level at which a 15-kilovolt rated termination can withstand surges, such as lightning, is ? crest.
110kv
33
An IEEE Class 1 Termination has two seals located at the top and bottom
True
34
The function of the bottom seal on an IEEE Class 1 Termination is to provide a(n) ? to the cable jacket and ground wire.
Moisture seal
35
Some porcelain terminations are referred to as “potheads.” A pothead performs sealing functions because it is filled with a(n) ? .
Potting compound
36
A termination’s ? distance is the surface distance between a conductor and ground, also referred to as the string distance.
Creepage
37
The type of stress control used in heat shrink terminations is a ? .
Stress control tube
38
A basic (tubular) heat shrink termination for outdoor use can be upgraded by ?
Installing separate heat shrink skirts
39
The way to shrink a Quick Term II Termination onto the cable is to slide the termination body onto the cable and remove the core. Starting with the loose end, pull while unwinding ? .
Counter-clockwise
40
The type of IEEE termination that provides stress control and should be used in a clean, dry environment is the Class ? .
3
41
Without stress control, the cable’s electric field becomes very concentrated and the resulting voltage stress is high enough to break down the air. This break down is referred to as a partial discharge or ? .
Corona
42
There are ? common termination types.
5
43
Terminations are categorized as live-front connections.
True
44
For additional protection, the termination’s creepage path may be covered with ? tape.
Silicone
45

Substation Year 3 lvl 3 (5 decks)

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