Omicron CP CR500 User manual

CP CR500
User Manual
COMPENSATING REACTOR FOR
DISSIPATION FACTOR / TANGENT
DELTA MEASUREMENTS AT
LARGE GENERATORS AND
MOTORS
in combination with CP TD1

CP CR500
2
Article Number VESD0608 - Manual Version: CP CR500.AE.4
© OMICRON electronics 2008
This manual is a publication of OMICRON electronics GmbH.
All rights including translation reserved. Reproduction of any kind, e.g., photocopying, microfilming,
optical character recognition and/or storage in electronic data processing systems, requires the explicit
consent of OMICRON electronics. Reprinting, wholly or in part, is not permitted.
The product information, specifications, and technical data embodied in this manual represent the
technical status at the time of writing and are subject to change without prior notice.
We have done our best to ensure that the information given in this manual is useful, accurate and
entirely reliable. However, OMICRON electronics does not assume responsibility for any inaccuracies
which may be present.
The user is responsible for every application that makes use of an OMICRON product.
OMICRON electronics translates this manual from the source language English into a number of other
languages. Any translation of this manual is done for local requirements, and in the event of a dispute
between the English and a non-English version, the English version of this manual shall govern.

Contents
3
Contents
1 Using This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Related Documents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 Safety Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Handling the High-Voltage Cables and the CP CR500 . . . . . . . . . . . . . . .8
2.3 Operating the CP CR500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Inductors inside the CP CR500 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.2 High-Voltage Sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.3 Low-Voltage Connector (LV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.4 Safety Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.5 Equipotential Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4 Setting Up the Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 First Step: Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.2 Connecting CPC 100 to CP TD1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.3 Connecting the CP CR500 to a CPC 100 (Safety Circuit). . . . . . . . . . . .14
4.4 Connecting the CP CR500 to the Test Object. . . . . . . . . . . . . . . . . . . . .15
4.5 Connecting Both Inductors of a CP CR500 . . . . . . . . . . . . . . . . . . . . . . .16
4.6 Connecting Two CP CR500 Units in Parallel . . . . . . . . . . . . . . . . . . . . .16
5 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1 Find Resonance Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.2 Carry Out the Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
5.2.1 Grounded Specimen Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

CP CR500
4
6 Diagnostic of Rotating Machines Insulation . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 Tan Delta Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.2 The D Tan Delta" or "TIP-UP" Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.2.1 Purpose and Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
6.2.2 Interpretation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
6.3 The Dielectric Response of Winding Insulation . . . . . . . . . . . . . . . . . . . .27
6.4 Example: C - Tan Delta Measurements on a Generator . . . . . . . . . . . . .28
6.5 Literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
6.6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
7 Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Contact Information / Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . .41
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

5
Using this Manual
1 Using this Manual
The purpose of this user manual is to get you quickly started with the CP CR500.
The user manual guides you through the process of measuring Dissipation
Factor / Tangent Delta at large generators and motors with the test system
CP TD1.
Reading the CP CR500 User Manual alone does not release you from the duty
of complying with all national and international safety regulations relevant to
working with CPC 100, CP TD1 and CP CR500. The regulation EN 50191 "The
Erection and Operation of Electrical Test Equipment" as well as the applicable
regulations for accident prevention in the country and at the site of operation has
to be met.
1.1 Related Documents
The following documents complete the information covered by the CP CR500
User Manual:
1.2 Designated Use
The CP CR500 is designated for compensating large capacities to enable
measurements at large generators and motors with the test system CP TD1. It
must only be used for applications described in this user manual.
Title Desciption
CPC 100 User Manual Contains information on how to use CPC 100 +
CP TD1.
CP TD1 Reference Manual Contains detailed information on the underlying
measurements methods.

CP CR500
6

7
Safety Instructions
2 Safety Instructions
Before operating the CP CR500, please carefully read the following safety
instructions.
It is not recommended that the CP CR500 be used (or even turned on) without
understanding the information in this manual.
The CP CR500 should only be operated by trained personnel.
2.1 General
Application of high voltage tests is only allowed for operators who are
particularly skilled and experienced in high voltage testing!
The operator is responsible for the safety requirements during the whole test.
Before performing tests using high voltage, please read the following :
– Do not perform any test without having carefully read the CPC 100, CP TD1
and CP CR500 user manuals!
– Read in particular all safety instructions and follow them!
– Do not use the test equipment without a good connection to substation
ground!
– Pay attention to the national and the international standards for the safe
operation of high voltage test equipment (EN 50191, IEEE 510 and others).
– Always follow the five safety rules:
– Never touch any terminal without a visible earth connection!
– Do not open the CP CR500 housing.
FOR YOUR OWN SAFETY
Always follow the 5 safety rules:
1. Insulate
2. Secure to prevent reconnecting
3. Check isolation
4. Earth and short-circuit
5. Cover or shield neighboring live parts

CP CR500
8
– Properly ground CP CR500, CP TD1 and CPC 100 by connecting them to
the common equipotential ground. Use earth connection cables of at least
6 mm² cross-section. Never operate the CP CR500 without solid grounding.
– Never touch the high-voltage sockets of the CP CR500 during operation.
Consider these sockets as live, and due to the high voltage life-hazardous.
– The plugs of the high-voltage cables and the cables themselves are not
shielded and therefore not safe. While operating the CP CR500, consider
these cables as live, and due to the high voltage life-hazardous.
2.2 Handling the High-Voltage Cables and the
CP CR500
Before handling the high-voltage cables or the CP CR500 proceed as follows:
1. Press the emergency stop button on the CPC 100's front panel or disconnect
CPC 100 from the mains.
2. While working in the dangerous zone, turn the safety key on the CPC 100's
front panel to "lock" (vertical) and remove the key to prevent anyone from
accidentally turning on the high voltage.
3. Check the operational condition, in particular:
– that only the green light "0" on the CPC 100's front panel is lit and
–that CP TD1 does not give an acoustic warning sound.
4. Now the high-voltage cables and the CP CR500 can be handled safely.
12 kV

9
Safety Instructions
2.3 Operating the CP CR500
For safe CP CR500 operation:
1. Make sure that only the green light "0" on the CPC 100's front panel is lit.
CP TD1 may not give any acoustic warning sound.
2. Secure the CP CR500 unit with a chain or a barrier tape at a distance of at
least 1 m / 3 ft to prevent an accidental entering of the dangerous zone
during operation.
3. Connect CP CR500, CPC 100 and CP TD1 as described in this user manual.
4. Do not operate the CP CR500 without connecting the safety circuit!
5. Make sure that the connectors are tighlty fit before turning on the high
voltage.
6. Turn on the high voltage only for the short time that the measurement
requires.
7. Do not touch cables while operating.
8. Do not leave the test set during operation.
9. Once the measurement is finished, press the emergency stop button on the
CPC 100's front panel.
10.After you have finished working with the CP CR500, turn the safety key on
the CPC 100's front panel to "lock" (vertical) and remove the key to avoid
anyone turning on the high voltage accidentally.

CP CR500
10

11
Description
3 Description
The CP CR500 is a compensating reactor to enable Dissipation Factor /
Tangent Delta measurements of large generators and motors in combination
with CP TD1. CP TD1 is able to deliver up to 300 mA at 12 kV. With this power,
capacities up to 80 nF can be compensated at 50 Hz. For larger capacities more
current is required.
The CP CR500 contains two inductors. In parallel to the test object it forms a
resonant circuit, which is able to compensate reactive power. By tuning the
frequency via CPC 100 and CP TD1, the circuit can be brought into resonance.
At that time, the CP TD1 is forced to deliver only the effective power while the
current within the resonant circuit can be much higher. Thus, with a single
CP CR500, capacities up to 500 nF at 50 Hz can be compensated.
3.1 Inductors inside the CP CR500
Essential parts of the CP CR500 compensation reactor are two high power
inductors with an inductive reactance of 40 H each. Both are capable to
compensate 1 A. Connected in parallel, 2 A can be compensated by an
inductive reactance of 20 H.
Each of the two inductors is protected by an overcurrent relay that interrupts or
reconnects the safety circuit. The following time table shows the approximate
"ON" and "OFF" times of the overcurrent relay at different currents:
3.2 High-Voltage Sockets
The CP CR500 provides two high-voltage sockets for connecting with the test
object. Two high-voltage cables are also included.
Caution:
– Never touch the high-voltage sockets of the CP CR500 during operation.
Consider these sockets as live, and due to the high voltage life-hazardous.
– The plugs of the high-voltage cables and the cables themselves are not
shielded and therefore not safe. While operating the CP CR500, consider
these cables as live, and due to the high voltage life-hazardous.
Current in A 0.3 0.6 0.8 1.0
ON time in seconds continuous 30 15 10
OFF time in seconds -606080

CP CR500
12
3.3 Low-Voltage Connector (LV)
The CP CR500 provides one low-voltage connector LV for connecting with
CP TD1 and, if necessary, to another CP CR500 (Figure 3-1: ”CP CR500’s
Interface Panel” on page 12).
3.4 Safety Connection
On the interface panel of the CP CR500, there are two D-Sub 9 connectors
(male and female) named Safety A (male) and Safety B (female).
These connectors are used for the safety circuit.
3.5 Equipotential Ground
The connector EG is connected with the CP CR500's equipotential ground
(functional earth, protective earth).
Caution:
For a safe operation make sure that all units involved and the trolley, if used, are
connected to the common equipotential ground. Use earth connection cables of
at least 6 mm² cross-section. Never operate the test setup without solid
grounding.
Figure 3-1:
CP CR500’s Interface
Panel
Safety B
(D-Sub 9
female)
Safety A
(D-Sub 9 male)
LV connector
(low voltage)
Connector for
equipotential
ground

13
Setting Up the Test
4 Setting Up the Test
The test setup consists of the CPC 100 and CP TD1 test system, the CP CR500
compensating reactor(s) and the test object itself.
4.1 First Step: Grounding
Caution:
For a safe operation make sure that all units involved and the trolley, if used, are
connected to the common equipotential ground. Use earth connection cables of
at least 6 mm² cross-section. Never operate the test setup without solid
grounding.
Connect CPC 100, CP TD1, the CP CR500 compensating reactor(s) and the
test object as described below.
Figure 4-1:
Principle diagram of test
setup
CP TD1 CP CR500
To next
CP CR500 or to
CPC 100 dongle
12 kV
Cx
Safety
Measurement
Booster Serial
CPC 100
Modem cable

CP CR500
14
4.2 Connecting CPC 100 to CP TD1
First, connect CPC 100 with CP TD1 as follows:
1. Switch off CPC 100 at the main power switch.
2. Properly connect the CPC 100's and CP TD1's grounding terminals to earth.
Use cables of at least 6 mm² cross-section.
3. Connect CP TD1's "BOOSTER IN" to CPC 100's "EXT. BOOSTER". Use
only the booster cable supplied by OMICRON.
4. Connect CP TD1's "SERIAL" to CPC 100's "SERIAL". Use only the data
cable supplied by OMICRON.
The data cable also provides the power supply for CP TD1.
4.3 Connecting the CP CR500 to a CPC 100
(Safety Circuit)
1. Remove the dongle from CPC 100’s "connector for external safety functions"
(at the right side of CPC 100).
2. Connect the Safety A connector at the CP CR500 interface panel to
CPC 100’s connector for external safety functions using the modem cable
(length 9 meter).
3. Terminate the Safety B connector at the CP CR500 interface panel with the
CPC 100 dongle that is normally plugged in at the CPC 100’s connector for
external safety functions.
If you use two CP CR500, please refer to 4.6 ”Connecting Two CP CR500
Units in Parallel” on page 16.

15
Setting Up the Test
4.4 Connecting the CP CR500 to the Test Object
Caution:
– Never touch the high-voltage sockets of the CP CR500 during operation.
Consider these sockets as live, and due to the high voltage life-hazardous.
– The plugs of the high-voltage cables and the cables themselves are not
shielded and therefore not safe. While operating the CP CR500, consider
these cables as live, and due to the high voltage life-hazardous.
1. Connect the CP CR500's high-voltage cable to the test object (e.g., a
transformer) using the clamp provided with the CP CR500.
2. Connect low side of the test object to equipotential gound.
3. Connect the CP CR500's high-voltage cable to the high-voltage socket HV1
or HV2.
4. Connect the CP CR500's LV connector to CP TD1's connector IN A (red
plug) using the the low-voltage cable for measuring inputs.
5. Secure the CP CR500 unit with a chain or a barrier tape at a distance of at
least 1 m / 3 ft to prevent an accidental entering of the dangerous zone
during operation.
Figure 4-2:
Connecting the
CP CR500 to the test
object
--
HV Cable
CP TD1
HV Cable CP CR500
Cx
Clamp with sockets
*) Note: This is not the OMICRON-supplied red
connecting cable. It is diplayed red here to denote
its importance for operational safety!
CPC 100
dongle
Grounding cable (yellow/green)
Grounding cable (yellow/green)
Safety *)

CP CR500
16
4.5 Connecting Both Inductors of a CP CR500
The CP CR500 contains two inductors with 40 H each. If one inductor alone
cannot compensate the designated capacity, a second inductor can be
connected in parallel.
Figure 4-3:
Using both CP CR500
inductors
4.6 Connecting Two CP CR500 Units in Parallel
To compensate larger capacities (> 500 nF) two CP CR500 units can be
connected in parallel. The following table shows all possible capacities to
compensate with different numbers of CP CR500.
Connection Configuration C-values [μF] and Vmax-values [kV]
at different resonance frequencies [Hz]
inductor L [H] Imax [A]354250607185Hz
one 40.0 1.0 0.52/8.4 0.36/10 0.25/12 0.18/12 0.13/12 0.09/12 μF/kV
both 20.0 2.0 1.03/8.4 0.72/10 0.51/12 0.35/12 0.25/12 0.18/12 μF/kV
2 HV Cables CP CR500
Safety *)
HV Cable
CP TD1
Cx
Clamp with sockets
CPC 100
dongle
Grounding cable (yellow/green)
Grounding cable (yellow/green)
*) Note: This is not the OMICRON-supplied red
connecting cable. It is diplayed red here to denote
its importance for operational safety!

17
Setting Up the Test
1. If you apply a second CP CR500 unit, connect it to the Safety B connector of
the first CP CR500 unit using the second modem-cable (length 9 m). Close
the Safety B connector on the second unit with the CPC 100 dongle.
2. Connect both CP CR500 units to the test object using the high-voltage
cables (4-4 ”Connecting two CP CR500 units in parallel”).
3. Connect both low-voltage LV connectors to each other using the delivered
standard connection leads 1 x 2 m x 2.5 mm² (black).
Figure 4-4:
Connecting two
CP CR500 units in
parallel
Connection Configuration C-values [μF] and Vmax-values [kV]
at different resonance frequencies [Hz]
# units # parll. L [H] Imax[A]354250607185Hz
1 1 40.0 1.0 0.52/8.4 0.36/10 0.25/12 0.18/12 0.13/12 0.09/12 μF/kV
2 20.0 2.0 1.03/8.4 0.72/10 0.51/12 0.35/12 0.25/12 0.18/12 μF/kV
2 3 13.3 3.0 1.55/7.7 1.08/9.3 0.76/11 0.53/11 0.38/11 0.26/11 μF/kV
4 10.0 4.0 2.07/7.7 1.44/9.3 1.01/11 0.70/11 0.50/11 0.35/11 μF/kV
4 HV Cables CP CR500
Safety *)
CPC 100 dongle
HV Cable
CP TD1
Cx
Clamp with
sockets
Grounding cable (yellow/green)
*) Note: This is not the OMICRON-supplied red
connecting cable. It is diplayed red here to denote
its importance for operational safety!

CP CR500
18

19
Testing
5 Testing
5.1 Find Resonance Frequency
1. After everything is properly connected, open a TanDelta test card at the
CPC 100.
2. Set test voltage to 500 V.
3. At the "Mode" list box on the TanDelta test card (main page), select the
"GST" mode.
4. It is recommended to select "Z" in the compound measurement setting list
box to get results for the impedance measurement.
5. Push the CPC 100 I/O button (Test Start/Stop).
6. Adjust the test frequency until the minimum current is displayed:
– if the angle value is negative, decrease the frequency
– if the angle value is positive, increase the frequency.
Avoid to set the test frequency to the same value as the nominal frequency (e.g.,
50.00 / 60.00 Hz) in order to suppress mains frequency interferences.
To increase the maximum voltage, set the frequency higher (up to 5 Hz) than the
resonance frequency.
Figure 5-1:
Finding the resonance
frequency
)
2 6
3
4
read current
6

CP CR500
20
5.2 Carry Out the Test
5.2.1 Grounded Specimen Test
Take the GSTgA+B mode acc. to sections 4.4 until section 4.6.