Download High voltage Test procedure for SSS magnets - SM18

Operation Methods for SSS
Date: 30-08-2004
High Voltage Test in SSS
(Warm Initial, Cold and Warm Final)
Prepared By
Checked by
Approved By
Sridhar Sethumadhavan
IGCAR, Kalpakkam
K.P. Kesavan Nair
BARC, Mumbai
Richard Mompo
AT/MTM
Vinod Chohan
AT/MTM
CERN, Switzerland.
CERN, Switzerland.
Dept. of Atomic Energy,
India
Operation Methods are used for testing the LHC Magnets in Cryogenic Conditions in
building 2173 (SM18) and are the working documents produced for that purpose only. These
Methods are step-by-step procedures that may be followed by the Shift Operators of SM 18 for
carrying out different tests of the super-conducting magnets.
Procedure Number
OM-SSS-HV
1.
Title
High voltage Test procedure for SSS magnets
(Cold and Warm)
AIM
High voltage tests are performed here to verify the withstanding capacity of the various
components to normal and abnormal voltage stresses. The SSS could face these stresses
during normal LHC operation. Quench SSS is just one instance wherein various SSS
circuits could face extreme voltage stress. It is also important to determine the behavior
of the SSS during thermal cycling (warm to cold and vice versa. In this scenario, it
becomes obligatory to find the insulation strength of those components satisfying their
nominal expected performance.
2.
TEST IN BRIEF
Normal working voltages of components like quadrupole, sextupole, dipole correctors
etc. with some safety factor decide the test voltages. Many combinations of circuits like,
quadrupole versus ground, quench heaters, corrector magnets etc. are tested for their
insulation integrity at the predefined test voltages. Performance of the circuits is judged
by measuring leakage current, resistance and capacitance.
The procedure of the HV test is similar to the test performed on main Dipoles. The
difference between the tests is highlighted in italics.
3.
PREPARATION
3.1 Configuring Test Bench
3.1.1
Inform cryogenic operators that you are going to perform insulation test.
3.1.2
Scan the mobile rack used for the HV test using the MOBIC.
3.1.3
Switch off the Low and high frequency acquisition from TEMA.
3.1.4
Make sure that the rotary switch of power converter is in closed circuit
(CC) position.
3.1.5
Make sure that the rotary switch of the auxillary power converters are in
closed circuit (CC) position (3 nos).
3.1.6
Discharge all the quench heater power supplies using red trigger buttons
on high-field and low-field quench heater cards in the safety matrix
crate. (This is to avoid lethal electrical shock while removing connector
from IFS box distribution box).
3.1.7
Remove connectors P11, C10 & C11 from the distribution panel which are
at the side of the test bench.
3.1.8
Remove connector D21 from the IFS box which is at the top of the
magnet.
Revised in November 2004
2
3.1.9
Disconnect the six cables (Marked “to be disconnected for HV”) on the
main current leads and the auxiliary current leads.
3.1.10 Disconnect a Burndy cable connector labelled ‘V_clamp to be
disconnected for HV” near the corrector leads. And connect another
similar connector lying there in that place.
3.1.11 Check that the DC and AC cables used in the IAP test are not connected to
any voltage taps
3.1.12 Disconnect water hose near the rotary switch corresponding to the bench.
(As shown in Annexure – 1)
Note : Point 3.1.9 TO 3.1.12 need not be done for tests “Warm initial before
bolting to CFB”- WP14 and “Warm after thermal cycle disconnected from
CFB”- WP17
3.2 Connection of Instrumentation to Mobile Rack
3.2.1
Connect distribution panel connectors P11, C11, C10 (which are removed
from the test bench) to the corresponding positions in the mobile rack
(Quadrupole patch panel).
3.2.2
Connect cable marked 14 (ground) of mobile rack to magnet body.
3.2.3
Connect the Burndy connector output from the mobile rack to the socket
provided for connector D21 on IFS box of the magnet.
3.2.4
Connect the Burndy connector output from the mobile rack to the socket
provided for connector P25 on IFS box of the magnet.
3.2.5
Connect two serial port cables (labelled Megger and PLC) from the test
bench to the corresponding connectors of the mobile rack.
3.2.6
Power the flash lamp and also the mobile rack and inform the people
around the magnet about the beginning of insulation test.
4 LAUNCHING OF SOFTWARE PROGRAMME
4.1.1
After choosing the appropriate server2.2.5., open x-term window on that.
4.1.2
Type ‘HV’ against the prompt and press ENTER key.
4.1.3
During the launching of software you will be prompted for login
information.
4.1.4
Provide login name and password against the request.
4.1.5
Fill in the following information in the measurement panel:
4.1.5.1.1
Select Magnet type (SSS)
4.1.5.1.2
Select Magnet name (Custom Name- SSSxxx)
4.1.5.1.3
Select Bench Number
4.1.5.1.4
Enter Magnet Temperature
Revised in November 2004
3
4.1.5.1.4.1 Enter Gauge - TT821 (Magnet)
4.1.5.1.4.2 Enter Ambient Temperature
4.1.5.1.5
Enter Ambient Relative Humidity
4.1.5.2 Press ‘REMOTE CONTROL’ button (green) from the same panel, and
put on the megger, placed inside the mobile rack, in response to the
prompt.
4.1.5.3 Choose a proper sequence from the menu and press ‘RUN
SEQUENCE’ button.
4.1.5.4 In case of failure of any step from the test sequence, press the run
recovery operation. The same test will be repeated and if the problem
persists, contact equipment support.
4.1.5.5 Once the test sequence is completed, Generate report and put off
megger from the HV programme panel by pressing ‘OFF’ button (red).
5 NORMALISATION OF THE TEST BENCH AFTER HV TEST
5.1.1
Remove connectors P11, C10 & C11 from mobile rack and connect to the
corresponding position in the distribution panel which are at the side of
the test bench.
5.1.2
Remove cable marked 14 of mobile rack from the magnet body.
5.1.3
Remove connector D21 connector of the mobile rack from the IFS box
which is at the top of the magnet and connect the D21 connector of the
magnet to the IFS Box.
5.1.4
Remove connector P25 connector of the mobile rack from the IFS box
which is at the top of the magnet and connect the P25 connector of the
magnet to the IFS Box.
5.1.5
Reconnect the six cables (Marked “to be disconnected for HV”) on the
main current leads and the auxiliary current leads.
5.1.6
Reconnect a Burndy cable connector labelled ‘V_clamp to be
disconnected for HV’ near the corrector leads.
5.1.7
Connect water hose near the rotary switch corresponding to the bench.
5.1.8
First open the return valve of the corresponding bench. Then open the
forward valve.
5.1.9
Remove two serial port cables (labelled Megger and PLC) from the
mobile rack.
Revised in November 2004
4
ANNEXURE - 1
Disconnection of water for 13kA water cooled cables
1. Close the inlet valve (1) of the circuit either manually by turning the valve to
vertical position, or electrically from the PLCCU panel.
1
2
2. Close the outlet valve of the circuit manually by turning the valve (2) to vertical
position.
Revised in November 2004
5
3. Close both inlet and outlet valves (3) of the power cables by turning the manual
valve to transversal position.
4. Release the pressure in the circuit by
a. Turning the valves (4.a) to longitudinal position, and then
b. Pressing the push-button valves (4.b).
3
4.a
4.b
5. Remove the two tubes above.
Revised in November 2004
6