SP0407 Commissioning Tests For HV UG Cables
SP0407 Commissioning Tests For HV UG Cables
SP0407 Commissioning Tests For HV UG Cables
1. PURPOSE AND SCOPE * Note: This course is part of Cable Joining Training. Staff
performing HV Cable Testing should complete this training if not
The purpose of this Standard Work Practice (SWP) is to standardise
competent.
and prescribe the method for pre commissioning and commissioning
tests on high voltage underground cables. Where new cables are 3. DOCUMENTATION
jointed to existing cables the test requirements are modified as
CS000501F115. Daily/Task Risk Management Plan
described in this SWP to cater for the aged insulation of existing
cables. ES000901R102. Health and Safety Risk Control Measures
2. STAFFING RESOURCES SP0407R01 Commissioning Tests for New HV Cables (up to 33 kV)
Job Safety Analysis
Electrical Fitter and/or Mechanic or Cable joiner.
SP0407R02 Testing HV Cables Supplementary Information
Competent Assistant.
SP0407R03. Commissioning Test For HV Underground Cable (up to
Safety Observer where required. 33kV) SWP SP0407 - Field Instruction
Required Training SP0407C01 HV Cable Commissioning Test Report Form
Staff must be current in all Statutory Training relevant for the task. SP0407C04 Commissioning Tool – HV Cables (Up to 33kV)
All workers must have Completed Field Induction or have recognition SP0506. Substation Primary Plant and Secondary Systems Field
of prior Ergon Energy Field Experience. Testing SWP
Contractors must have completed Ergon Energy's Generic SWMS001. Working at Heights - Poles & Ladders
Contractor Worker Induction.
SWMS002. Working at Heights (Mobile Elevated Work Platform
Additional Training (as required)
P53. Operate the Network Enterprise Process
Training Course Description for Authorisations or Certificates.
AS2067-2008 Substations and High Voltage Installation Exceeding 1
Switching Operator Lines kV a.c.
Switching Operator Assistant BS0435:1984
Safe Entry to High Voltage Enclosures and Authorised 4. KEY TOOLS AND EQUIPMENT (as required)
Access / Test Permit Recipient and Authorised Pole Rescue Kit.
Safe Work in Confined Spaces Switchboard Rescue kit.
* Test HV UG Cables up to 33kV Confined Space Monitoring and Rescue equipment.
Confined Space Awareness Roadway warning signs.
5kV Insulation Resistance Tester (10 kV for 12.7/22 and 19/33 kV Assign adequate staffing resources with required competencies to
cables). safely complete task.
Additional Equipment for testing Major Cables Persons performing electrical testing must ensure electrical
equipment is tested to confirm electrical work performed is
• Very Low Frequency (VLF) high voltage Test Set for XLPE electrically safe.
cables;
All staff to wear appropriate PPE including applicable class of gloves
• DC high voltage test set for Paper Lead cables. if required. Ensure class 00 gloves, and insulated mats are used
while working on or near exposed live LV parts.
5. TASK STEPS
Use roadway warning signs/ barricading to control vehicle and
5.1 On Site Risk Assessment pedestrian traffic around work zone and relevant exclusion zones
Prior to performing this activity any hazards associated with around live parts.
prerequisite tasks at the worksite shall be identified and assessed Ground conditions and potential slip/fall hazards in travel path
with appropriate control measures implemented and documented in considered in CS000501F115 Daily/Task Risk Management Plan.
accordance with Daily/Task Risk Management Plan CS000501F115
and using reference document Health and Safety Risk Control Identify locations defined as confined spaces and ensure compliance
Measures ES000901R102. with confined space entry requirements.
If any risks cannot be managed or reduced to an acceptable level, do Ensure exclusion zones are maintained at all times while near
not proceed with the task and seek assistance from your Supervisor. exposed live parts.
Ensure appropriate construction and operational drawings are on Where it is identified that barriers or shields cannot prevent
hand. contact with the adjacent energised cable terminations (eg
Magnefix cable termination kits), all HV within the exclusion
Use correct methods to positively identify the cable to be tested, zone shall be isolated, tested and earthed in accordance with
including ensuring that cable number (where allocated) has been P53 High Voltage Isolation and Access Procedures prior to
securely attached.
gaining access to HV cable terminations.
22kV or more
Caution: Where the cables to be tested are not disconnected from
the ABB Safelink RMU the following actions must be taken to
185 - 630mm2 500 250 125 62 minimise the risk of injury or damage:
35mm2 400 200 100 50
1. The Earth Switch on any energised ABB Safelink RMU must not be
Data is not presently available for cables larger than the cables switched from the EARTH to OFF position when the connected HV
specified above; however the insulation resistance should not be Electrical Apparatus are under access (i.e. the Busbar of the RMU
significantly lower than the figures above. must be de-energised using double isolation before the Earth Switch
can be operated).
For PVC sheathed cables, the acceptance value is 1 MΩ.
Earth the screen after test for at least 5 minutes. 2. After operating the Earth Switch the switching operator must
visually confirm that the correct switch state is displayed by the
Where the prescribed values cannot be achieved the connection
indicator. If the indicator is incorrect or in an indeterminate state
arrangement should be first checked.
personnel must stay well clear of the RMU and associated cable(s)
Where applicable the assistance of a high voltage test specialist may and contact the Switching Co-ordinator for further instructions.
be sought and the Asset Manager must be advised where the value 5.6 Core Insulation Test
remains low.
Prior to the high voltage withstand test (if required), the cable shall
The Asset Manager will decide if sheath resistance values lower than be tested for insulation resistance (IR).
the prescribed figures will be accepted.
The test voltage used for the core insulation test is specified in the
Cables with a suspected or confirmed sheath fault are not to be table below.
energised.
Three-phase Switching
The use of ganged three-phase switching is one of the most effective
and commonly used methods of avoiding ferroresonance.