student manual - saskpower 3 book 2/2. underground tool… · 12 student training manual lesson 2:...

March 31, 2005

S T U D E N T M A N U A L

Underground Tools

Copyright 2004 by the Training and Development Centre, SaskPower. All Rights Reserved

2 S T U D E N T T R A I N I N G M A N U A L

Prerequisites: • None

Objectives: Given underground operating and grounding tools, you will be able to explain the purpose and demonstrate the care and use of each tool.

Rationale: When performing various tasks on an underground distribution system, proper tool selection and use will ensure the safety of all workers involved. Since the lines feeding underground apparatus cannot be readily seen, it is critical that protective tools be used properly and consistently.

Learning Objectives• Identify and explain the function of the hotsticks/accessories

required for underground operating.• Demonstrate the care and use of hotsticks/accessories required for

underground operating.• Identify and explain the function of the tools required for

underground grounding.• Demonstrate the care and use of the tools required for underground

grounding.

Learning Methods• Self-learning + On-the-job• On-the-Job Demonstration and Practice• Self-learning + On-the-job• On-the-Job Demonstration and Practice

EVALUATION METHODS

• Written test• On-the-Job Evaluation• Written test• On-the-Job Evaluation

U N D E R G R O U N D T O O L S 3


STUDENT RESOURCES

• None

Learning Steps1. Read the Learning Guide.2. Follow the steps outlined in the Learning Guide.3. Clarify any questions or concerns you may have.4. Complete the Practice and Feedback.5. Complete the Evaluation.



Lesson 1: Underground Hotsticks and AccessoriesLearning Objective:Identify and explain the function of the hotsticks/accessories

required for underground operating.Learning Method:Self-learning + On-the-jobEvaluation Method:Written test

Introduction

By using hotsticks and various associated accessories, clearances frompotential hazards can be maintained while performing variousunderground operating tasks.

Hotsticks

There are three main types of hotsticks used in underground operating:

• 8 foot grip-all hotstick• 6 foot impact elbow puller• 6 foot half-inch pushrod/lever elbow puller

Prior to use, check for an inspection due date sticker to ensure it isvalidated for use. Visually inspect the hotstick for cracks or damage inthe fiberglass epoxy and for loose or broken components. Operate thehotstick a couple of times, ensuring all moving parts are functioningproperly. Clean the hotstick with a silicon impregnated cloth,thoroughly wiping the fiberglass coating. After use, place the hotstickin a suitable canvas bag and store in a cool, dry and dark place.



8 Foot Grip-all Hotstick

DANGERSTOP

Do not use a grip-all hotstick to pull elbows. Stress isput on the operating rod and roll pins, causing the pinsto pull through the fibreglass operating rod. As aresult, the hook may open in a critical situation and anelbow flashover could occur.



6 Foot Impact Elbow Puller

This is a hammer type underground elbow removal and installation tool.It is used on high voltage elbows to provide sufficient force wheninserting the elbow onto a transformer bushing. The impact elbowpuller provides the operator with the ability to break the seal between theelbow and bushing, while maintaining control of the cable. Cuppedends fit over the elbow and are tightened securely by rotating the handle.



6 Foot Half-inch Pushrod/Lever Elbow Puller

This is very similar to the impact elbow puller in that it is a tool for theremoval of high voltage elbows while maintaining control of the cable.This particular hotstick, however, uses a lever and pushrod to force theelbow off the bushing.

---Note---Because of its bulky construction, the lever elbow puller does notwork very well in congested areas.

CAUTION!Class 2 rubber gloves must be worn when opening thedoors of any underground apparatus. Leather glovescan be used to operate with an approved hotstick.



Accessories

There are various accessories which provide the operator with testequipment to indicate voltage hazards or component failures. There arealso accessories which allow personal access to the equipment, but denypublic entry:

• modiewark potential tester• radio interference testers• underground apparatus access wrenches

Due to the sensitive nature of this equipment, it must be stored in itsappropriate storage case. This equipment is battery operated and propercare must be taken to ensure reliability.

Modiewark Potential Tester

This is a voltage potential testing tool, capable of identifying energizedcables and apparatus. The modiewark indicates voltage potential by the



use of a red indicator light and a beeping noise.

To ensure the modiewark is operating, turn on the 240V scale and rubthe instrument head on cloth or clothing to obtain a frictional charge.The modiewark is then set to a desired voltage setting and placed inclose proximity to the apparatus to be checked. For higher voltages,attach the modiewark to a grip-all hotstick.

Radio Interference Testers

A radio interference tester can detect an arcing fault or corona presencewhich causes radio noise. The corona or arcing fault is an indication ofpossible elbow failure. An operator can use this tester prior toproceeding with any work on underground apparatus to identify apotential hazard.

Underground Apparatus Access Wrenches

Electrical underground apparatus (transformers, switching cubicles and



reactors) have a special bolt and screw locking mechanism which permitaccess to qualified personnel and prevent access to the general public.

Kiosk Allen Wrench

The kiosk allen wrench is used mainly on older type transformers withan allen head screw containing a pin in the centre (prevents the use ofordinary allen wrenches). This particular wrench is an allen type with ahollow centre (to access the screw’s centre pin).

Pentagon Wrench



The pentagon wrench is used on the newer types of undergroundapparatus and contains a special pentagon (five sided) bolt that must beremoved to gain access to the high voltage equipment inside.



Lesson 2: Underground Hotsticks and AccessoriesLearning Objective:Demonstrate the care and use of hotsticks/accessories required

for underground operating.Learning Method:On-the-Job Demonstration and PracticeEvaluation Method:On-the-Job Evaluation



Skills Practice

1. Demonstrate the care and use of an underground hotstick.

1. Check for cracks in the epoxy fibreglass.

2. Check the di-electrical test date.

3. Operate the hotstick to ensure it functions correctly.

4. Clean the hotstick with silicon cloth.



Lesson 3: Grounding EquipmentLearning Objective:Identify and explain the function of the tools required for

underground grounding.Learning Method:Self-learning + On-the-jobEvaluation Method:Written test

Introduction

Thoroughly clean and inspect all equipment prior to using a groundingkit. A yellow box or bag is usually used to hold the equipment requiredto ground the underground lines or apparatus. A typical kit contains thefollowing:

• Feed throughs - enables switchman to isolate, check for potential, ground and park cables or provide a normal open point in the loop



• Grounding elbows - used in place of a grounding eye rod; recommended because of flash containment in case of closing on energized line



• Test probes - used to test for potential



• Insulated caps - used for covering feed-through bushings and transformer bushings



• Spearing tool - used to spear isolated cables (order replacement blades)



• Elbow arrestors - used to cover energized bushings

Other grounding equipment may include:

• Three-phase clusters are used for dead break transformers• Three-phase clusters are used for load break transformers• Grounding eye rod - should be replaced with insulated grounding

elbow• Live front ground lead - special end to fit in holder on bushing of

live front transformer• Single grounded parking bushing - a heavy ground lead

differentiates between this bushing and a regular parking bushing



Lesson 4: Grounding EquipmentLearning Objective:Demonstrate the care and use of the tools required for

underground grounding.Learning Method:On-the-Job Demonstration and PracticeEvaluation Method:On-the-Job Evaluation



Skills Practice

1. Demonstrate the care and use of an underground grounding tool.

1. Inspect and clean grounding devices.

2. Inspect the insulation.

3. Check the conductor.

4. Tighten the connections.

5. Wire brush the clamps.



Summary

To summarize this module, you have learned:

• The function of hotsticks and accessories required for underground operating.

• To care for and use hotsticks and accessories required for.• The function of the tools required for underground grounding.• To care for and use the tools required for underground grounding.

Practice Feedback

Review the lesson, ask any questions and complete the self test.

Evaluation

When you are ready, complete the final test. You are expected toachieve 100%.



Review Questions

T / F 1. Hotsticks can distance the operator from potential hazards while performing various underground tasks.

T / F 2. An 8 foot grip-all hotstick is used to remove a load break elbow.

3. Elbow pullers provide the operator with the ability to:(a) Remove high voltage cables and install

apparatus.(b) Install high voltage cables and remove apparatus.(c) Remove high voltage cables and maintain control

of the cable.(d) Install apparatus and maintain control of the

cable.

4. Modiewarks are used to:(a) Test for current.(b) Indicate faults.(c) Test for radio noise.(d) Test for voltage potential.

T / F 5. Radio interference tests can detect an arcing fault.

6. Two types of underground apparatus wrenches are:(a) A crescent wrench and allen wrench.(b) A kiosk allen wrench and pentagon wrench.(c) A crescent wrench and kiosk allen wrench.(d) A pentagon wrench and allen wrench.

T / F 7. A radio interference test is mandatory prior to initiating any switching operations.

8. An underground grounding kit could include:(a) Ground elbows.(b) Test probes.(c) Insulated caps.(d) All of these



T / F 9. Elbow arrestors are used to ground underground cables.

T / F 10. Test probes are used to check for potential.

T / F 11. Insulated caps are used for covering feed-through bushings and transformer bushings.

12. The tool shown is a:

(a) Feed-through.(b) Grounding elbow.(c) Elbow arrestor.(d) Insulating cap.




(a) Feed-through.(b) Grounding elbow.(c) Elbow arrestor.(d) Insulating cap.




(a) Test probe.(b) Spearing tool.(c) Ground lead.(d) Grounding elbow.



15. The tool shown is:

(a) Feed-through.(b) Y-insert.(c) Test probe.(d) Elbow arrestor.



Review Question Solutions

1. T

2. F

3. Remove high voltage cables and maintain control of thecable.

4. Test for voltage potential.

5. T

6. A kiosk allen wrench and pentagon wrench.

7. F

8. All of these

9. F

10. T

11. T

12. Grounding elbow.

13. Insulating cap.

14. Spearing tool.

15. Feed-through.

student manual - saskpower 3 book 2/2. underground tool… · 12 student training manual lesson 2:...

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