Rejuvenation Instructions · The data collection process is detailed in the data collection procedures (step 2) below. g. Move to the second cable end and repeat data collection.

©Novinium, Inc. 2015, all rights reserved. Novinium, Inc. [email protected] 22820 Russell Rd Kent, WA 98032 Revised: September 30, 2015 (253) 395-0200

Rejuvenation Instructions

#290 – Pre & Post-Injection PD Test

This NRI covers the following:

Understanding the application of pre and post-injection partial discharge (PD) testing.

How to set up the partial discharge test equipment and collect data.

How to process the partial discharge data and submit it for analysis.

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©Novinium, Inc. 2015, all rights reserved. NRI 290 – Pre & Post-Injection PD Test Revised: September 30, 2015 Page 1 of 16

Table of Contents Description .............................................................................................................................................................................. 2

1. Pre-injection test. ........................................................................................................................................................ 2

2. Post-injection test. ...................................................................................................................................................... 2

Required Equipment ............................................................................................................................................................... 2

1. Feeder test kit. ............................................................................................................................................................ 2

2. Install feeder test software on laptop. ....................................................................................................................... 3

3. Laptop computer......................................................................................................................................................... 4

Equipment and Setup.............................................................................................................................................................. 4

1. Cable system analyzer (CSA). ...................................................................................................................................... 4

2. CSA setup. ................................................................................................................................................................... 5

Procedures .............................................................................................................................................................................. 6

1. Project planning. ......................................................................................................................................................... 6

2. Data collection. ........................................................................................................................................................... 8

3. Data processing. ........................................................................................................................................................ 14


Description 1. Pre-injection test.

The pre-injection test identifies cables with active electric trees or other defects inside the insulation that

are so severe that Cablecure injection would provide little benefit to the short-term reliability of the cable.

The CableWise sensor is placed close to the cable to detect small discharges, and the cable system analyzer

(CSA) records them for later analysis by CableWise.

For pro-active injections, the pre-injection test should be:

Performed no more than two weeks prior to taking the cable out of service for the injection. Delays in taking the cable out of service may result in having to take a second pre-test in order to comply with this requirement.

Performed following any event that could put the validity of the pre-injection test result in question. Examples of such events include off-line insulation testing, severe electrical storms, load shifting, or any other dramatic changes in the operation of the cable system.

Performed from both cable ends. This will reduce the effects of outside interference and allow for better analysis of the cable insulation. If the span between the two terminations exceeds 2,000ft, consult with Engineering.

2. Post-injection test.

The post-injection test is performed after a feeder cable has been re-energized following injection and is

intended to detect the active electrical trees that may have been initiated during switching operations.

A positive result provides the customer with certainty that all craftwork has been properly performed and that the injection was successful.

A negative result allows Novinium to identify the problem and take corrective action and avoid an unplanned cable outage for the customer.

Post-injection testing should be performed within three days after the circuit has been re-energized. Many

of the defects associated with post-injection failures manifest within three days, and the benefits of the

test are greatly reduced with each day that passes.

Required Equipment 1. Feeder test kit.

The feeder test kit (11781-1) contains the hardware and accessories necessary to perform the tests (Figure 1).

At the heart of the test kit is the cable system analyzer (CSA), which is a device that records the partial discharge (PD) signals that occur within cable insulation, cable accessories, and the surrounding switchgear and transformers.


The CSA ties the CableWise sensors used to collect PD data to the laptop computer that provides the graphical user interface.

Figure 1: Feeder test equipment.

2. Install feeder test software on laptop.

The feeder test software (11782-1) has been developed especially for the pre and post-injection test.

The software offers a simple user interface and requires a minimal amount of user input fields prior to data collection.

Installation can be done in the field following the set of instructions included in the Feeder Test Software.

Figure 2: Feeder test software.


3. Laptop computer.

A laptop computer is required to load the feeder test software and to connect to the cable system analyzer

(CSA) for data collection. While the standard Novinium issued laptop may be suitable, the system

requirements listed below should be verified:

Windows 7.

80GB hard drive (40GB free).

Multi-core processor recommended.

CD/DVD drive.

Ethernet port.

Battery (computer must run on battery alone during data collection).

As an option, the CableWISE controller (11655-1) is a semi-field rugged Dell ATG laptop computer that has

been specified to meet the requirements of partial discharge data acquisition and processing.

Equipment and Setup 1. Cable system analyzer (CSA).

The front facing features of the cable system analyzer (CSA) are shown in Figure 3 and described below:

Power Switch – Turns the CSA on and a.off. The indicator light above blinks green while the system boots up and is a steady green when ready to acquire data.

Forced Trigger Switch – Switches the b.CSA into a forced trigger mode. For most applications, this switch should stay in the off position. The indicator light above will blink red when the forced trigger option is activated.

Charging Indicator – The indicator c.light will be red while charging and switch to green when complete.

Figure 3: Front panel features of CSA.

Signal-Strength Meter – Indicates the ability of the CSA to properly synchronize with the cable’s power d.frequency.

The rear facing features of the CSA are shown in Figure 4 and described below:


Figure 4: Rear panel features of CSA.

Ground Stud – Connection point for the supplied ground cable. a.

Sensor Input – Connection point for the CableWISE sensor through the 50ft coax cable or other N-type b.adapter.

Magnetic Coupler Input – Optional connection point for the magnetic coupler used to synchronize the c.signal to the magnetic field.

Frequency Switch – Toggles the CSA between searching for synchronization on 50Hz and 60Hz d.systems. In the United States, 60 Hz should be selected.

Serial Port – Only used for firmware upgrades. e.

Charger Input – Connection point for recharging the CSA’s internal battery using the supplied charger. f.

Ethernet Port – Connection point for the supplied crossover Ethernet cable that connects the CSA to g.the controller.

USB Port – Only used for firmware upgrades. h.

Memory Card – The supplied SD Card will be used to store the data. i.

The cable system analyzer (CSA) has an internal battery capable of 8-12 hours of data collection when fully

charged.

Charging of the CSA should be done prior to each project day using the supplied 9V DC universal charging adapter with a universal input of 90-264V AC.

Charging will take approximately four hours.

NOTE: Never collect data when the CSA or laptop is powered from an AC source.

2. CSA setup.

The setup schematic for the cable system analyzer (CSA) is shown in Figure 5 and additional details are

provided below:


Figure 5: Connection diagram of CSA with controller laptop and CableWISE sensor.

Connect the CSA to the controller laptop using only the supplied crossover Ethernet cable (820032 or a.820033).

Connect the supplied ground cable (11764-1) to the ground stud found on the back panel of the CSA by b.tightening the wing nut down on the cable’s ring lug.

Connect the clamp end of the ground cable to a suitable ground on the cable system under test. c.

Connect the CSA to the CableWISE sensor using the 50ft coax cable (11731-1). d.

Ensure that the CSA and laptop controller are both charged and set to run off of battery power only. e.

NOTE: all charging adapters in the vicinity of the test equipment should be unplugged.

Turn on the controller laptop and allow it to run through its startup process. f.

Turn on the CSA and watch for the green LED to transition from blinking to solid, indicating that the g.CSA is ready to communicate with the controller.

Check to ensure that the Forced Trigger switch on the front panel of the CSA is in the off position and h.that its blinking indicator light is off.

Check to ensure that the frequency switch (50/60Hz) is properly set on the back of the CSA to match i.the cable system under test.

Procedures 1. Project planning.

Schedule the feeder test. a.

The test will require a lineman to place the sensor and a qualified operator of the test equipment and software.

Z

Controller Laptop

11655-1

Cable System

Analyzer

11751-1

Crossover Cable

82003250' Coax Cable

11731-1

Ground Cable

11764-1

CableWISE

Sensor


Scheduling should take into account access to the cable terminations, which may require customer involvement.

Assign a cable segment number to each phase. b.

The segment number will be used by the feeder test program to organize the test data and to link it to the CTS records.

This means either affixing the tags or reserving the segment tags in advance of the injection work.

Select the test point locations and the sensor size. c.

The sensors will need to be placed over the shielded portion of the cable (semi-con) and ideally over the concentric neutrals or ground shield.

The Feeder Test Kit contains a 2 inch and 3 inch-wide sensor to accommodate most single-phase feeder applications. However, additional sizes are available.

During feeder training, selecting the test point locations where the most meaningful data can be collected will be further discussed.

While both end points are often selected as the test point locations, there are some issues that may require alternative choices. The may be accessibility to manholes, sub-stations, etc. and should be discussed with Engineering.

Set up the feeder test equipment near the first test point. d.

Follow the instructions from the data collection section (step 2 below) and reference the connection diagram in Figure 3.

The equipment should be set up outside of the immediate work zone and roughly 10-20ft away from the cables to be tested.

Take the background data. e.

The background data provides the engineer with a set of data to compare against each test so that partial discharges occurring outside the cable system can be distinguished from those occurring inside the cable system.

Acquire partial discharge data for each phase. f.

The data collection process is detailed in the data collection procedures (step 2) below.

Move to the second cable end and repeat data collection. g.

Repeat the process for selecting the proper sensor and test point location, the background data collection, and the acquisition of partial discharge data for the three phases.

Transfer the SD card to the laptop and process the data. h.

Processing the data reduces the file size, making it easier to forward onto Engineering.

Specific instructions are provided in the data processing procedures section (step 3 below).

Email the processed data to Engineering for analysis. i.


The email address [email protected] has been created to streamline the data submission and analysis process.

Include the segment number(s) and whether it is a PRE or POST test in the subject line of the email.

Wait for the test results. j.

The results should be emailed back to the team coordinator in approximately two business days.

2. Data collection.

Set up and ground the equipment as discussed in the ‘Equipment and Setup’ section of this document. a.

Ensure that the CSA and laptop controller are both charged and running off of battery power only. b.

NOTE: all charging adapters in the vicinity of the test equipment should be unplugged.

Ensure that the laptop controller is set to the correct local date and time. This information is used to c.date stamp the data.

Ensure that the SD memory card is inserted in the card slot located on the back of the CSA with the d.lock protection switch disabled.

Launch the CSA Feeder Test program by double clicking the icon found on the desktop. e.


Fill each section of the test point information form by either typing or selecting from the dropdown f.menu (Figure 6).

Company Name: name of the utility or circuit owner.

Cable Segment No: the unique segment number. The arrows on the right can be used to easily switch to the next segment numbers in the series. Folders will be automatically created and named with the information typed in this box. If a single folder is preferred, select a name that encompasses all the cables to be tested.

Test Location: select either Termination 1 or 2 from the dropdown menu.

Test Description: select the type of test being performed – Pre-Injection Test, Pre-Injection Background Test, Post-Injection Test, or Post-Injection Background Test.

Operator: type up to three letters to identify the employee performing the test.

Figure 6: CSA feeder test program main screen.

NOTE: The file name will draw information from the fields entered in the Test Point Information form. Fields must be completed before continuing.

Click the Verification button to perform a system verification test to verify if the system is working g.correctly.

Turn on the System Calibrator (11680-1) and hold the antenna in the center of the sensor (Figure 7). h.


Figure 7: Perform the verification test using the System Calibrator 11680-1.

Wait for the pattern to be similar to that shown in Figure 8. i.

NOTE: The system passes the system verification test if the peak to peak value falls between 21 and 25 mV. If the peak to peak value is out of the acceptable range, check the 50 ft. coaxial cable, sensor, and connection points. Repeat the test. Do not proceed with data collection until the system verification test requirements have been met.

Press the “Save Verify” button to complete the operation. j.

Figure 8: Verify mode showing signals from the System Calibrator 11680-1.


Press “OK” and return to the test point information form. k.

Figure 9: System verification completed.

Perform a background check at each location (once for each set of three phases) by holding the sensor l.in the direction of the cable to be tested.

NOTE: If the test point is in a switchgear cabinet, place the sensor on the ground with the sensor opening facing the cabinet. The door to the switchgear should be closed while performing this step.


Select either ‘Pre-injection m.Background Test’ or ‘Post-injection Background Test’ from the ‘Test Description’ dropdown.

Select “Take Data” to activate the n.CSA control program.


Select “Acquire Data” to initiate the PD data collection routine. The “System State” located on the o.lower right of the window updates to “Acquiring Data”. This may take several minutes.

Figure 11: Data acquisition screen.

Once complete, the CSA control program window will close and state ‘Process and Data stored’. p.

Click OK on the message window to return to the test point information form. q.


Collect data for each phase by placing the r.CableWISE sensor over the shielded portion of the cable under test (Figure 12).

NOTE: Placement of the sensor should be done only by a qualified lineman after receiving proper training.

Monitor the signal strength meter on the front s.panel of the CSA to confirm proper synchronization.

If the signal strength meter is greater than two bars, proceed to the next step and collect data.

If not, try to increase the level of synchronization by repositioning the sensor.

If unable to improve the level of synchronization to at least two bars, turn on the ‘Forced Trigger’ switch located on the front panel of the CSA and proceed to the next step.

Figure 12: Collecting PD data using a CableWISE

sensor (red).

Select either ‘Pre-injection Test’ or ‘Post-t.injection Test’ from the ‘Test Description’ dropdown.

Select ‘Take Data’ to activate the CSA control u.program.



Select “Acquire Data” to initiate the PD data collection routine. v.

The “System State” located on the lower right of the window updates to “Acquiring Data”.

This may take several minutes.

Figure 14: Data acquisition screen.

Once complete, the CSA control program window will close and state ‘Process and Data stored’. w.

Click OK on the message window to return to the test point information form and proceed to acquire x.data for the next phase, or move onto the second end of the cable.

For each feeder circuit, eight sets of data should be recorded (the three phases plus a background set y.from each cable termination).

3. Data processing.

Transfer the PD data onto the controller and process using the procedures below.

NOTE: The data processing step is computationally intensive and may require the laptop to be plugged into a wall outlet or charger.

Remove the SD card from the CSA and plug it into the controller laptop. a.

Click “CSA Process” found on the desktop or located in the start menu (Start | All Programs | Utilx). b.


The data is processed automatically. c.

This could take up to five minutes per test.

It is complete when all five of the progress bars show 100%.

The message "FILE PROCESSING IS COMPLETE. ZERO-SPANS ARE ZIPPED AND READY FOR UPLOAD" will appear in the Download Log.

Click Exit to close the program. d.

Figure 15: CSA data processing program.

The Zero-Span files have been automatically zipped and are ready to email for analysis. The Zip file is e.located in: C:\Data Storage\<Company Name>\<Pre or Post Segment#>. The file name is <Company Name>_<Pre or Post Segment#>.zip.

Figure 16: Data zip file location.


Email the three zip files associated with the feeder circuit to the address [email protected].

Include the segment number for each of the three phases.

Include in the subject line of the email whether it is a PRE or POST test (SUBJECT: Pre Test 123456, 123457 and 123458).

Open the SD card through ‘My Computer’ and manually delete any residual files before transferring the g.card back to the CSA.

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Rejuvenation Instructions · The data collection process is detailed in the data collection procedures (step 2) below. g. Move to the second cable end and repeat data collection.

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