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Royce_power
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Hi everyone,
anybody knows what's the general voltage level that we use for the rectifier in telecom power supply.
According to the user's requirement, it says:
a) AC to DC Converters: Minimum 8000W @ -48V
b) DC to DC down Converters: Minimum 2000W @ +24V (Optional)
1) The system must be capable of supplying a minimum load of 6000W at a nominal voltage of -48V (Positive Ground). In addition the system must have a minimum of 2000W redundancy.
2) The system shall be capable of supplying a minimum load of 1000W at a nominal voltage of +24V (Negative Ground). In addition a minimum of 1000W redundancy must be catered for. (Optional)
3) The DC supply must consist of suitable components configured to provide (N+1) redundancy. In the (N+1) configuration the “N” = total load required plus charge (under normal operations) while the “+1” caters for redundancy in the event of module failure. Modules must be ‘hot’ swappable, soft starting, and load sharing.
4) The Power System shall offer duel stage Low Volt Disconnecting devices in High and Low Priority groups to prevent any damage to batteries.
The Low Priority: 75% of total Battery Capacity
The High Priority: 25% of total Battery Capacity
i.e. Low priority circuits will shed at a higher voltage level than High priority circuits. These voltage disconnect values will be determined by the user. When AC voltage is restored, the LVD-disconnect devices will automatically reconnect to restore system mode and charging.
AC Distribution Requirement:
1) The Power System must provide for AC input to the system. The system shall cater for a three phase supply and be easily adaptable to accept single phase supply as well.
2) A triple pole isolator shall be provided to disconnect the system from the supply. Each rectifier will have its own individual circuit breaker.
3) The AC distribution shall be suitably enclosed to prevent any accidental electrocution whilst working on the system.
4) All cabling shall enter and exit through the top of the indoor cabinet
5) All cabling shall enter and exit through the bottom of the outdoor cabinet
DC Distribution requirement:
The Power System must provide for the following DC load connections as a minimum:
1) One -48V, 63 Amp High Priority disconnect circuit breaker
2) Three -48V, 63 Amp Low Priority disconnect circuit breakers
3) DC to DC down convertor input protection circuit breakers
4) Two 32 Amp DC to DC down convertor output circuit breakers
5) Four auxiliary -48V, 10 Amp circuit breakers
These load disconnect voltages are user settable and dependant on battery technology. As a standard we have specified that the rectifiers supplied have the following base settings:
6) Boost voltage = 2.40 volt per cell, i.e. 57.6 volt for total battery
7) Normal float = 2.23 volt per cell, i.e. 53.52 volt for total battery
8) Low priority disconnect (BTS) = 2.10V per cell, i.e. 50.40 volt for total battery
9) High priority disconnect (Transmission) = 1.83V per cell, i.e. 43.92 volt for total battery
According to my boss experience, it says normally we will use 24V, 48V or 60V for DC
rectifier, so which level is the best for my case and give me the kindly reason/working
principle behind. Thanks :)
anybody knows what's the general voltage level that we use for the rectifier in telecom power supply.
According to the user's requirement, it says:
a) AC to DC Converters: Minimum 8000W @ -48V
b) DC to DC down Converters: Minimum 2000W @ +24V (Optional)
1) The system must be capable of supplying a minimum load of 6000W at a nominal voltage of -48V (Positive Ground). In addition the system must have a minimum of 2000W redundancy.
2) The system shall be capable of supplying a minimum load of 1000W at a nominal voltage of +24V (Negative Ground). In addition a minimum of 1000W redundancy must be catered for. (Optional)
3) The DC supply must consist of suitable components configured to provide (N+1) redundancy. In the (N+1) configuration the “N” = total load required plus charge (under normal operations) while the “+1” caters for redundancy in the event of module failure. Modules must be ‘hot’ swappable, soft starting, and load sharing.
4) The Power System shall offer duel stage Low Volt Disconnecting devices in High and Low Priority groups to prevent any damage to batteries.
The Low Priority: 75% of total Battery Capacity
The High Priority: 25% of total Battery Capacity
i.e. Low priority circuits will shed at a higher voltage level than High priority circuits. These voltage disconnect values will be determined by the user. When AC voltage is restored, the LVD-disconnect devices will automatically reconnect to restore system mode and charging.
AC Distribution Requirement:
1) The Power System must provide for AC input to the system. The system shall cater for a three phase supply and be easily adaptable to accept single phase supply as well.
2) A triple pole isolator shall be provided to disconnect the system from the supply. Each rectifier will have its own individual circuit breaker.
3) The AC distribution shall be suitably enclosed to prevent any accidental electrocution whilst working on the system.
4) All cabling shall enter and exit through the top of the indoor cabinet
5) All cabling shall enter and exit through the bottom of the outdoor cabinet
DC Distribution requirement:
The Power System must provide for the following DC load connections as a minimum:
1) One -48V, 63 Amp High Priority disconnect circuit breaker
2) Three -48V, 63 Amp Low Priority disconnect circuit breakers
3) DC to DC down convertor input protection circuit breakers
4) Two 32 Amp DC to DC down convertor output circuit breakers
5) Four auxiliary -48V, 10 Amp circuit breakers
These load disconnect voltages are user settable and dependant on battery technology. As a standard we have specified that the rectifiers supplied have the following base settings:
6) Boost voltage = 2.40 volt per cell, i.e. 57.6 volt for total battery
7) Normal float = 2.23 volt per cell, i.e. 53.52 volt for total battery
8) Low priority disconnect (BTS) = 2.10V per cell, i.e. 50.40 volt for total battery
9) High priority disconnect (Transmission) = 1.83V per cell, i.e. 43.92 volt for total battery
According to my boss experience, it says normally we will use 24V, 48V or 60V for DC
rectifier, so which level is the best for my case and give me the kindly reason/working
principle behind. Thanks :)