EPDU 3.0 Presentation
Short Description
EPDU 3.0 Presentation...
Description
EPDU 3.0 Enclosed Power Distribution Unit
Mats Almskog; Power Design Åke Ericsson, Expert; Site Power & Grounding 19/09/2016
1
system • The Purpose of EPDU 3.0 system • LOD versus HOD (Ericsson solution) • Short description of EPDU 3.0 and its parts • Example/ Example/rec recomenda omendation tion on how the EPDU EPDU 3.0 3.0
should be used/installed in a telecom application application (AXE/CPP (AXE/CPP/BSP /BSP,, etc)
19/09/2016
2
system • The Purpose of EPDU 3.0 system • LOD versus HOD (Ericsson solution) • Short description of EPDU 3.0 and its parts • Example/ Example/rec recomenda omendation tion on how the EPDU EPDU 3.0 3.0
should be used/installed in a telecom application application (AXE/CPP (AXE/CPP/BSP /BSP,, etc)
19/09/2016
2
The Purpose of EPDU 3.0 system
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3
Engineering/Installation concerns Type of Power Power Plant Plant HOD 2-wire
HOD LOD 2-wire
LOD
LOD 2-wire
LOD
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Ericsson’s telecom equipment
HOD 2-wire
AXE/ CPP etc
√ OK
LOD 2-wire
AXE/ CPP etc
√ OK
HOD 2-wire
AXE/ CPP etc
NOK 4
Engineering/Installation concerns Type of Power Plant
Ericsson’s telecom equipment
HOD 2-wire
HOD 2-wire
AXE/ CPP etc
HOD LOD 2-wire
LOD 2-wire
AXE/ CPP etc
LOD
LOD 2-wire
LOD
19/09/2016
√ OK √ OK
HOD 2-wire
EPDU 3.0
AXE/ CPP etc
√ OK 5
Engineering/Installation multi vendor site Type of Power Plant
Telecom equipment
LOD 2-wire
LOD
19/09/2016
EPDU 3.0
Ericsson HOD 2-wire telecom
√ OK
Vendor X LOD 2-wire telecom
√ OK
Vendor Y LOD 2-wire telecom
√ OK 6
LOD versus HOD
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7
Low Ohmic Distribution, LOD Power plant
Telecom loads
Distribution R-cable
-54V
AC DC
R-cable
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8
Low Ohmic Distribution, LOD Power plant
Telecom loads
Distribution R-cable
-54V
AC DC
R-cable
•
In the event of an abnormal situation in the distribution system load), a short circuit may occur.
19/09/2016
or
within the telecom equipment (telecom
9
Low Ohmic Distribution, LOD Power plant
Telecom loads
Distribution R-cable
-54V
AC DC
R-cable
3-5kA
• •
In the event of an abnormal situation in the distribution system or within the telecom equipment (telecom load), a short circuit may occur. A current path will be created with a short circuit current of 3-5kA depending on the total impedance in the current path
19/09/2016
10
Low Ohmic Distribution, LOD Power plant
Telecom loads
Distribution R-cable
-54V
AC DC
R-cable
3-5kA -54V -27V 10 ms
• • •
In the event of an abnormal situation in the distribution system or within the telecom equipment (telecom load), a short circuit may occur. A current path will be created with a short circuit current of 3-5kA depending on the total impedance in the current path During the time until the fuse have tripped for this short circuit current (up to 10 ms), the voltage level at the distribution will drop below the minimum voltage level for the loads that as a consequence will turn off
19/09/2016
11
Low Ohmic Distribution, LOD Power plant
Telecom loads
Distribution R-cable
-54V
C
AC DC
R-cable
C
3-5kA -54V
-54V -40.5V
-27V 10 ms
• • • •
10 ms
In the event of an abnormal situation in the distribution system or within the telecom equipment (telecom load), a short circuit may occur. A current path will be created with a short circuit current of 3-5kA During the time until the fuse have tripped for this short circuit current (up to 10 ms), the voltage level at the distribution will drop below the minimum voltage level for the loads that as a consequence will turn off Solution is that each load have an local energy reservoir, (hold up capacitors + blocking diode) to maintain a voltage level above -40V during the 10 ms time period until the fuse/circuit breaker operates and cut off the short circuit 19/09/2016
12
High Ohmic Distribution, HOD (Ericsson solution) Power plant -54V
Telecom loads
Distribution 30 mΩ
R-cable
AC DC
•
The key component in the HOD is an internal resistance of 30 m Ω in the distribution system
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13
High Ohmic Distribution, HOD (Ericsson solution) Power plant -54V
Telecom loads
Distribution 30 mΩ
R-cable
AC DC
•
In the event of an abnormal situation in the distribution system load), a short circuit may occur.
19/09/2016
or
within the telecom equipment (telecom
14
High Ohmic Distribution, HOD (Ericsson solution) Power plant -54V
Telecom loads
Distribution R-cable
30 mΩ
AC DC
Max 1 kA
• •
In the event of an abnormal situation in the distribution system or within the telecom equipment (telecom load), a short circuit may occur. A current path will be created with a short circuit current of maximum 1 kA due to the extra 30m Ω in the distribution
19/09/2016
15
High Ohmic Distribution, HOD (Ericsson solution) Power plant -54V
Telecom loads
Distribution R-cable
30 mΩ
AC DC
Max 1 kA -54V -40.5V
10 ms
• • •
In the event of an abnormal situation in the distribution system or within the telecom equipment (telecom load), a short circuit may occur. A current path will be created with a short circuit current of maximum 1 kA due to the extra 30m Ω in the distribution During the time until the fuse have tripped for this short circuit current (up to 10 ms), the voltage level at the distribution will drop, but due to the lower short circuit current, the voltage level at the load will not drop below the level where the loads turns off, meaning that there is no need for each load to carry its own energy reserve 19/09/2016
16
LOD versus HOD, summery
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LOD versus HOD, summery •
Both principles comply with basic requirements safety, EMC, reliability (e.g. immunity against single-point failure) etc.
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18
LOD versus HOD, summery •
Both principles comply with basic requirements safety, EMC, reliability (e.g. immunity against single-point failure) etc.
•
LOD puts special requirements downstream towards the input stage of the telecom equipment in terms of hold-up capacitors.
19/09/2016
19
LOD versus HOD, summery •
Both principles comply with basic requirements safety, EMC, reliability (e.g. immunity against single-point failure) etc.
•
LOD puts special requirements downstream towards the input stage of the telecom equipment in terms of hold-up capacitors.
•
HOD puts special requirements upstream towards the output stage of the -48 Vdc power plant in terms of a fix resistor in series with the circuit breaker.
19/09/2016
20
LOD versus HOD, summery •
Both principles comply with basic requirements safety, EMC, reliability (e.g. immunity against single-point failure) etc.
•
LOD puts special requirements downstream towards the input stage of the telecom equipment in terms of hold-up capacitors.
•
HOD puts special requirements upstream towards the output stage of the -48 Vdc power plant in terms of a fix resistor in series with the circuit breaker.
•
Both principles comply with relevant standards (issued by ETSI, ANSI etc.) stipulating a normal service input voltage range from approximately -40 to -57 Vdc.
19/09/2016
21
LOD versus HOD, summery •
Both principles comply with basic requirements safety, EMC, reliability (e.g. immunity against single-point failure) etc.
•
LOD puts special requirements downstream towards the input stage of the telecom equipment in terms of hold-up capacitors.
•
HOD puts special requirements upstream towards the output stage of the -48 Vdc power plant in terms of a fix resistor in series with the circuit breaker.
•
Both principles comply with relevant standards (issued by ETSI, ANSI etc.) stipulating a normal service input voltage range from approximately -40 to -57 Vdc.
•
There are no national or international standards stipulating HOD or LOD. The choice of HOD or LOD is more about tradition amongst operators and vendors.
19/09/2016
22
EPDU 3.0 system building blocks
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23
BYB 501 cabinet
• •
–
19/09/2016
O
OF
O
F
N
F
N
OF
O
OF
F
N
F
N
OF
O
OF
O
F
N
F
N
OF
O
OF
O
F
N
F
N
O
EPDU 3.0 system is housed in an Ericsson standard BYB 501 cabinet 2 Earth grounding bars: –
•
OF
in the top for overhead cabling In the bottom for raised floor cabling
Each grounding bar can fit up to eight, 50 mm 2 grounding/ earth strengthening cables (dual-lugs) 24
CBU-8, Circuit Breaker Unit OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
The CBU distribute incoming, low-ohmic, power and protect the outgoing distribution circuit branches that power the PDUs • • •
19/09/2016
2 Independent branch circuits, A and B Each branch supports 4 circuit breakers for outgoing power to PDU 2 type of CBU – 50A circuit breakers – 80A circuit breakers 25
PDU, Power Distribution Unit
•
•
The PDU is a distribution unit that converts the low-ohmic (LOD), incoming power to the high-ohmic (HOD), output power Two types of PDUs – –
PDU-14 with 14 outputs protected by 15A “electronic fuses” PDU-HC with 6 outputs protected by 30A “electronic fuses” + 1 output with a 15A “electronic fuse”
19/09/2016
26
PDU-14, Power Distribution Unit
•
14 outputs, each with a 15A “electronic fuse”
•
Two separate branches with 7 outputs each Each branch individual supplied with power from separate fuses in the CBU Each branch can supply a maximum of 2500W with power divided over the 7 outputs
• • 19/09/2016
27
PDU-HC, Power Distribution Unit
• • • • 19/09/2016
7 outputs, with a 30A electronic fuse + 1 with a 15A electronic fuse Two separate branches Each branch individual supplied with power from two separate fuses in the CBU Each branch can supply a maximum of 2500W with power 28
Fan Unit 3.0
• • • 19/09/2016
Dual power feed, A and B, from two separate fuses in the PDUs 3 fans, each with individual temp sensor If one fan fails, the other two will compensate for the loss of airflow 29
Control Unit 3.0
• •
Provides alarm & supervision functions in the EPDU system 2 types of Control Unit: – –
•
Dual power feed, A and B, from two separate fuses in the PDUs.
•
Monitor and collect alarms and load values from all PDU’s
•
and Fan unit in the cabinet via DENIB protocol that is an RS232 serial interface for units connected an a chain. Handles A and B alarm priorities External interfaces that can be connected to a Site Alarm Handler
•
19/09/2016
SCU, without display SCD, with a 2 raw display that show setting and alarms
30
EPDU Manager
• • • • • •
19/09/2016
Separate software for installation on a PC Provides complementary supervision of units in an EPDU system Presents alarms and status of the units in the EPDU Presents analog value reading for units in the EPDU Alarm setting adjustment Provides logging functionality
31
EPDU 3.0 System
EPDU 2
•
Two EPDU distribution systems in one cabinet
EPDU 1
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The “electronic fuse”
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33
The “electronic fuse” The overcurrent protection at the PDU output stage is: • neither a melting fuse nor a circuit breaker but an electronic circuit breaker, or as referred to in the daily words, an “electronic fuse”
19/09/2016
34
The “electronic fuse” The overcurrent protection at the PDU output stage is: • neither a melting fuse nor a circuit breaker but an electronic circuit breaker, or as referred to in the daily words, an “electronic fuse” • valid for each individual output of PDU-14 and PDU-HC
19/09/2016
35
The “electronic fuse” The overcurrent protection at the PDU output stage is: • neither a melting fuse nor a circuit breaker but an electronic circuit breaker or as referred to in the daily words an “electronic fuse • valid for each individual output of PDU-14 and PDU-HC
Approved ”catastrophic fuse”
19/09/2016
Functional requiement to comply with HOD
Electronic CLD (Current Limiting Device)
36
The “electronic fuse” The overcurrent protection at the PDU output stage is: • neither a melting fuse nor a circuit breaker but an electronic circuit breaker or as referred to in the daily words an “electronic fuse • valid for each individual output of PDU-14 and PDU-HC
Approved ”catastrophic fuse”
19/09/2016
Functional requiement to comply with HOD
Electronic CLD (Current Limiting Device)
37
Total power system with EPDU 3.0
19/09/2016
38
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
50A
Telecom load PDU (A-side) 15/30A
A
B
A
B
PDU (B-side) 15/30A
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39
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
50A
Telecom load
• Each “branch” in the PDU can handle max 2500W divided over the max number of outputs per branch.
PDU (A-side) 2500W
2500W
15/30A
A
B
A
B
PDU (B-side) 2500W
2500W
15/30A
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40
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
• Each “branch” in the PDU can handle max 2500W divided over max number of outputs • However, during “normal operation”, the max load for each branch is in reality 1250W
50A
Telecom load PDU (A-side) 2500 1250W
2500 1250W
15/30A
A
B
A
B
PDU (B-side) 2500 1250W
2500 1250W
15/30A
19/09/2016
41
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
• Each “branch” in the PDU can handle max 2500W divided over max number of outputs • However, during “normal operation”, the max load for each branch is in reality 1250W
50A
Telecom load PDU (A-side) 2500 1250W
2500 1250W
15/30A
• Each load total power consumption (2500W) is equally split between the A- and B-fed (1250W each)
A
2500W
1250W
B
1250W
PDU (B-side) 2500 1250W
2500 1250W
15/30A
2500W
A 19/09/2016
1250W
B
1250W
42
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
• Each “branch” in the PDU can handle max 2500W divided over max number of outputs • However, during “normal operation” the max load for each branch is in reality 1250W
50A
Telecom load PDU (A-side) 2500 1250W
2500 1250W
15/30A
• Each loads total power consumption (2500W) is equally split between the A- and B-fed (1250W each) • Should one of the PDUs fail completely, or the feeding fuse to one branch trip, this branch (B-side) will no longer carry any power
A
2500W
1250W
PDU (B-side) 2500 1250W
2500 1250W
15/30A
2500W
A 19/09/2016
B
1250W
B 43
EPDU 3.0 connection between a LOD power plant and -48V DC telecom loads LOD Power system
EPDU 3.0 HOD system CBU
AC A
DC
B
200A
50A
Telecom load
• Each “branch” in the PDU can handle max 2500W divided over max number of outputs • However, during “normal operation” the max load for each branch is in reality 1250W
PDU (A-side) 2500W
2500W
15/30A
• Each loads total power consumption (2500W) is equally split between the A- and B-fed (1250W each) • Should one of the PDUs fail completely, or the feeding fuse to one branch trip, this branch (B-side) will no longer carry any power • As a consequence, the total load power will now be supported from only one branch (A-side), that will reach its design maximum of 2500W per branch
19/09/2016
A
2500W
B
2500W 1250W
PDU (B-side) 2500 1250W
2500 1250W
15/30A
2500W
A 2500W 1250W
B 44
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