1. LV Safe Powering from UPS to Clients
Technical review on UPS power distribution of the LHC Beam Dumping System (LBDS)
Method:
individual interviews with group leaders based on the April schedule -> to gather bottom-up data,
EN retreat on 1st July -> the aim was to bring the MTP in line with the last schedule & saving requests from the Council in June
ENMB on 26th July -> validate with group leaders the top-down arbitration
V. Chareyre EN/EL 1
EDMS n°
20/06/2012

2. Outline Existing and new UPS systems for LHC UPS system functioning
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Outline
Existing and new UPS systems for LHC
UPS system functioning
UPS systems configuration in UA63, US65 and UA67
UPS distribution in UA63
Short-circuit and selectivity: studies and tests
Electrical distribution of the LBDS racks
WIENER power supply faults: description and analysis
Solutions for critical equipment
Implementations done during TS1
Plans and proposal for LS1 2
EDMS n°
20/06/2012

3. Existing Uninterruptible Power Supply (UPS) Systems
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Existing Uninterruptible Power Supply (UPS) Systems
Goal = Continue to provide power to critical loads whenever the input power fails for the time given by the backup battery
64 UPS dedicated to the LHC and located mainly in the RE, UA, US and UJ zones
Parameters of the existing UPS systems:
Type = APC Silcon UPS
Topology = delta conversion
Rated power = 80 kVA
Backup time = 10 min 3
EDMS n°
20/06/2012

4. New Uninterruptible Power Supply (UPS) Systems
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
New Uninterruptible Power Supply (UPS) Systems
Replacement of the existing APC Silcon UPS systems during LS1
Project motivations:
Improve the reliability
Decrease the failure rate
Minimize LHC run time losses
EN-EL project approved: see EDMS
Delta conversion topology replaced by the traditional double conversion topology
Parameters of the new UPS systems:
Topology = double conversion
Rated power = 100 kVA
Backup time = 10 min (imposed by QPS) 4
EDMS n°
20/06/2012

5. UPS System Functioning
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
UPS System Functioning
Priority given to the protection of the load!
Normal mode of functioning: load powered via the double conversion path
In case of normal a.c. source failure, the load remains supplied by the inverter using the battery stored energy
Battery mode without any break
Load automatically transferred to the bypass in the following conditions:
End of autonomy (if bypass a.c. source present)
Overload after a certain time (thermal image activated)
Short-circuit on the downstream load 5
EDMS n°
20/06/2012

6. UPS Systems Configuration in UA63, US65 and UA67
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
UPS Systems Configuration in UA63, US65 and UA67
Two UPS systems in parallel-redundant configuration
Active load sharing
One UPS able to supply the full load
In case of one UPS failure, automatic transfer of the full load to the remaining UPS
Hardwired interlocks between the powering interlock system and the UPS systems
In case of one single UPS failure: no impact on the magnet powering
In case of a failure of both UPS systems of a redundant configuration: stop of the magnet powering 6
EDMS n°
20/06/2012

7. UPS Distribution in UA63 EOD1/63 = switchboard downstream the UPSs
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
UPS Distribution in UA63
EOD1/63 = switchboard downstream the UPSs
Canalis on top of the racks supplied from this switchboard
Schneider C60N 40A C curve to protect the line
Single-phase distribution downstream the Canalis
One multiple sockets block per rack
ABB S502-C 13A to protect the line up to the multiple sockets block 7
EDMS n°
20/06/2012

8. Short-Circuit and Selectivity
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Short-Circuit and Selectivity
UPS short-circuit capability (limitation) = 2 x In
If the short-circuit current reaches this limit, automatic transfer to bypass (if bypass available)
Higher short-circuit power available from the bypass a.c. source (upstream transformer)
Tripping of the corresponding circuit breaker (at best directly above the fault)
Automatic re-transfer to normal mode after clearance of the fault
Selectivity principle between two circuit breakers:
The breaker directly above the short must trip before the upstream breaker 8
EDMS n°
20/06/2012

9. Selectivity Studies and Tests
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Selectivity Studies and Tests
Selectivity studies:
Using current-time curves
Using manufacturer catalog
Based on tests
ABB circuit breakers located on the Canalis classified as ultra-fast breaking devices
Tests performed in 2002 on a few ABB samples 9
EDMS n°
20/06/2012

10. Selectivity Studies Results
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Selectivity Studies Results
Current-time curves
Upstream breaker: C60N 40A C curve
Downstream breaker: ABB S502-C 13A
Time
Icc = 460 A, short-circuit current limit for 2 UPS in parallel before transfer to bypass
Magnetic curve given by the manufacturer
Results from tests performed on samples in 2002
Only 2 ms!
Current 10
EDMS n°
20/06/2012

11. Electrical Distribution of the LBDS General Purpose Racks
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Electrical Distribution of the LBDS General Purpose Racks
MYDGP racks powered from one Canalis named EOK107/63
Canalis powered by EOD107 in the switchboard EOD1
Safe power provided by 2 parallel-redundant UPS systems in UA63
Identical configuration in UA67 11
EDMS n°
20/06/2012

12. WIENER Power Supply Fault: 1st Event Feb. 2012
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
WIENER Power Supply Fault: 1st Event Feb. 2012
Power supply fault in a redundant WIENER crate
Loss of the power supply of the corresponding rack
ABB circuit breaker on the Canalis tripped
Selectivity: OK
UPS systems did not transfer to bypass: limitation not reached 12
EDMS n°
20/06/2012

13. WIENER Power Supply Fault: 2nd Event Apr. 2012
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
WIENER Power Supply Fault: 2nd Event Apr. 2012
Power supply fault in a WIENER crate of one IPOC system
Loss of the power supply of the Canalis EOK107 and all MYDGP racks connected
Both circuit breakers (ABB and upstream C60N 40 A) tripped
Selectivity: Not OK
UPS systems did not transfer to bypass: limitation not reached 13
EDMS n°
20/06/2012

14. WIENER Fault: Selectivity Analysis
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
WIENER Fault: Selectivity Analysis
UPS did not transfer to bypass
Short-current < 460 A
Both breakers tripped
<10 ms: breakers working in the ‘reflex zone’
Only 2 ms between the curve of the upstream breaker and the ABB tripping zone (estimated!)
Upstream breaker: C60N 40A C curve
Downstream breaker: ABB S502-C 13A
Time
Icc = 460 A, short-circuit current limit for 2 UPS in parallel before transfer to bypass
Magnetic curve given by the manufacturer
Results from tests performed on samples in 2002
Only 2 ms!
Reflex zone
Current 14
EDMS n°
20/06/2012

15. Solutions for Critical Equipment
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Solutions for Critical Equipment
Even if the selectivity is total and with several redundant UPS systems upstream, single distribution line (for the Canalis) = single point of failure!
Solution implemented for QPS systems:
Redundant equipments
Two power paths protected (by upstream UPS systems) and independent
In case of failure on one path, 50% of the equipment remain powered by a separate path (and protected by UPS systems)
This equipment must be enough to stop properly and safely the LHC
Existing configuration in point 6: two UPS systems in parallel-redundant configuration in US65 and powering:
Clients in US65
Redundant QPS systems (so-called F4 lines) both in UA63 and UA67 15
EDMS n°
20/06/2012

16. Implementation Done During TS1
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Implementation Done During TS1
Independent and protected power paths
Redundant equipment
New cable for one multiple socket block 16
EDMS n°
20/06/2012

17. Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Plans for LS1
Downstream switchboards will be replaced during LS1 (with APC Silcon UPS)
Replacement of the circuit breakers
Selectivity will be improved
Selectivity studies based on curves and manufacturer catalog (more reliable)
From UPS systems in UA63:
- EOD107/63: Schneider NSX100
- Multiple sockets block: Schneider C60N 16A (ABB 13A breaker has lower curves than C60N 16A so selectivity guaranteed)
From UPS systems in US65:
- EOD114/65: Schneider NSX100
- Multiple sockets block: Schneider C60N 10A 17
EDMS n°
20/06/2012

18. Proposal for LS1 Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Proposal for LS1
New distribution line from the redundant path coming from the UPS in US65
Line separated from the line dedicated to QPS
Local cabinet for powering several MYDGP racks 18
EDMS n°
20/06/2012

19. Requirements Studies for the new switchboards in progress
Technical Review: UPS for LBDS
LV Safe Powering from UPS to Clients
Requirements
Studies for the new switchboards in progress
Need to know LBDS requirements by the end of July for:
Studies and manufacturing of the switchboards
Studies for new distribution lines if required
Preparation of the works for LS1 19
EDMS n°
20/06/2012