NDB Technologie XDP-II User manual

XDP-II User’s Guide
NDB Technologie Inc. 02/04/08 1
PARTIAL
DISCHARGE DETECTOR
XDP-II
User’s Guide
Version 7.2
March 2009
NDB Technologie Inc.
1405 St-Jean Baptiste St., suite 111
Québec, QC
G2E 5K2, Canada
Phone: [phone]
Fax: [phone]
http://www.ndbtech.com

XDP-II User’s Guide
NDB Technologie Inc. 02/04/08 2
XDP-II User’s Guide
Copyright © 2006, and published by: NDB Technologie Inc.
1405 St-Jean Baptiste St., suite 111
Québec, QC
G2E 5K2, Canada
Phone: [phone]
Fax: [phone]
http://www.ndbtech.com
Last Edition, March 2009
Document no: XDP-II rev. 7.2

XDP-II User’s Guide
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TABLE OF CONTENTS
1. Introducing the XDP-II.............................................................................................. 4
1.1. Partial Discharges............................................................................................. 4
1.2. The XDP-II ........................................................................................................ 4
1.3. Applications....................................................................................................... 4
2. Product Overview..................................................................................................... 5
2.1. Equipment and Accessories.............................................................................. 5
2.2. XDP-II Overview................................................................................................ 6
3. Calibration Check (when using xdp-302 capacitive sensor)..................................... 8
4. XDP-II Main Functions and Modes........................................................................... 9
4.1. Menus: .............................................................................................................. 9
4.2. Peak-Angle Mode.............................................................................................10
4.3. Analysis Mode..................................................................................................12
4.4. Edge Mode.......................................................................................................12
5. Applications.............................................................................................................13
5.1. XPLE/EPR TYPE Cable splice & elbow PD check...........................................13
5.2. Filters ...............................................................................................................14
5.3. Off-line partial discharge test kit (using a variable transformer) .......................16
5.4. Off-line partial discharge test kit (using a PD free source) ...............................20
5.5. Switchgears......................................................................................................24
6. Technical Specifications..........................................................................................25
6.1. XDP-II Characteristics......................................................................................25
6.2. Batteries...........................................................................................................25
6.3. Specifications...................................................................................................26

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1. INTRODUCING THE XDP-II
1.1. PARTIAL DISCHARGES
Partial discharges (PD) occur between layers of isolation that have different
characteristics. They can gradually lead to the deterioration of the insulating
material’s dielectric properties.
1.2. THE XDP-II
The XDP-II detects quick variations of electrical fields caused by partial
discharges. It can also be used to locate partial discharges on isolated
equipment. In maintenance programs, it allows the monitoring of decaying
equipment, hence providing a safer environment for workers.
The partial discharge signal is detected by a capacitive coupling, and then
amplified by the XDP-II in a radio frequency bandwidth. The signal amplitude is
proportional to the discharge energy. The XDP-II can display this level of
discharge in dB or in picocoulombs (pC) if pC mode is selected in the calibrated
set-up.
1.3. APPLICATIONS
The XDP-II can be used to detect partial discharges in the following applications:
•XLPE cable, joint elbows
•Transformers
•Insulators
•Surge Arresters
•Switchgears
•Etc.

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2. PRODUCT OVERVIEW
2.1. EQUIPMENT AND ACCESSORIES
The following standard components are provided with the XDP-II:
•A 12 V AC/DC adapter
•User’s guide
Fig 2.0
The following options are also available for the XDP-II:
•Capacitive spatula sensor
•Reference module with BNC-BNC adapter
•Inductive sensor
•Differential sensor
•Capacitive coupler (50 kV)
•BNC cable
•Nylon mesh pouch with transparent protection membrane
•Handling rod
•Customized sensor (according to application)
•Waterproof case
•XDP-II Software

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2.2. XDP-II OVERVIEW
Figure 2.1: XDP-II overview

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LABEL NAME AND DESCRIPTION
1 REFERENCE CONNECTOR: The reference module is connected
to this output when doing an equipment inspection.
2 CHARGER PLUG: 12V DC battery charger connection and
software PC connection via serial port.
3 LCD DISPLAY: Displays the intensity level of the discharge both in dB and on a bar graph, and also shows the waveform of the signal
and indicates the battery level.
4 SENSOR’S CONNECTOR: Spatula or coupler connection.
5 SPEAKER: Allows the user to listen to the signal.
6 BACK: Send back to the preceding menu level, when in the menu options. This key can also give the absolute value related to the
dB.
7 ENTER: Selects options in the menus.
8 UP / VOLUME (+): When used in the default reading mode, raises the speaker's volume. When used in the menus, sends to the
upper option.
9
BACKLIGHT: Toggles the backlight on and off: press once to get
50% intensity, twice to get 100% intensity and press one more time
to turn it off. Please note that the backlight shuts off automatically
after 45 seconds.
10 I/O: Turns the XDP-II on and off.
11 DOWN / VOLUME (-): When used in the default reading mode, lowers the speaker's volume. If used in the menus, browses menus
and submenus.

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3. CALIBRATION CHECK (WHEN USING XDP-302 CAPACITIVE SENSOR)
When the XDP-II is turned on, it emits a signal at the reference module’s output. It
is recommended to compare the XDP-II with the reference value on a regular
basis. You need to perform the following steps to verify your XDP-II upon arrival
and whenever deemed necessary:
1. Connect the reference module.
2. Then connect the spatula sensor.
3. Place the sensor on the module in a way to make it cling around it as
much as possible (See Figure 3.0).
4. Turn the XDP on by pressing the I / O key.
5. Verify that the value displayed by the XDP-II is identical to the value
given on the sensor’s case.
6. Disconnect the reference module after testing.
Note: The test signal lasts thirty seconds and immediately starts after the activation of
the XDP-II. If you do not have time to complete the test during this time, you will
have to reset the XDP-II by turning it off and on again. It is important to mention
that the auto-test cannot be interrupted. You can have access to the menus even
if the auto-test is not finished.
Fig. 3.0: Testing the reference value
•If the reading is not identical to the value on the sensor
(+/-2dB), change the sensor and restart the test
procedure.
•If the test fails with a different sensor, please contact
NDB Technologie Inc.

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4. XDP-II MAIN FUNCTIONS AND MODES
4.1. MENUS:
The XDP-II has five menus and many submenus that allow the user to
perform a variety of tasks:
SAVE:
This menu allows the user to record the signal by pressing the " ENTER " key.
The XDP-II saves the recording in its memory, assigning it with a
sequential number and the current date and time of the recording in hours,
minutes and seconds.
MODE:
Four different modes can be selected from this menu. More instructions on
these four modes are provided further in this chapter:
•PEAK-ANGLE
•CALIBRATION PICO
•ANALYSIS
•EDGE
FILE:
Thanks to this function, the user can listen to signals previously saved as
well as signatures downloaded with the software. The up and down arrow
buttons are used to select the recordings. Three submenus can be
selected:
•OPEN FILE
•DELETE ALL
•REF. SIGNATURES
PARAMETERS:
This mode is used to define three different parameters for the XDP-II:
CYCLES TO
DISPLAY: Sets the number of cycles to be displayed in the
waveform graphic. Two, four or eight cycles can be
selected. The XDP-II software provides up to 16 cycles
view.
FREQUENCY: Sets the XDP-II according to the power frequency of
the country where it is used. (50Hz or 60 Hz). The ’10
sec’ frequency is used with very low frequency AC

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HIPOTS.
POLARITY: Sets the polarity of the signal to be displayed on the
screen.
NORMAL:
Partial discharges on the screen will be absolute.
Therefore a negative pulse will be seen as being
positive.
BIPOLAR:
Both positive and negative discharges will be displayed
with a line in the middle of the screen.
POS ONLY:
Only positive discharges will be displayed.
NEG ONLY:
Only negative discharges will be displayed.
SYSTEM:
In this menu, the user can choose between four submenus:
DATE TIME: You can adjust the real-time clock on your XDP-II. This
setting is very important as the date and time are
automatically associated with the record number.
LANGUAGE: Sets the XDP-II system language. Five different
languages are available: English, French, Spanish,
German or Italian.
CONTRAST: Sets the contrast level of the LCD.
VERSION: Displays the XDP-II firmware version
.
4.2. PEAK-ANGLE MODE
Description
The peak-angle mode will display partial discharges by synchronizing with the line
frequency. It will display peak amplitude averages for every three degrees of a
cycle. This provides information on the phase angle at which the partial discharge
appears. This technique reduces the random noise signal that is unsynchronized
with the frequency network.