Effective solutions to back up priority load and solution for battery back up time longer (Rectifier Systems for BTS)

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Site Investigation Report
Trial of Increasing LVLD Voltage Level
Alwan Ramadan WX289116, July-31-2015

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Site ID : 90574
Site Name : Manggarai Utara
Category Site : End site
Site information

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View of Equipments

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View of Equipments
APM30H DC Power SystemBattery Rack

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View details Rectifier Systems
Equipment Connected3*30 Rectifier Modules

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View of Battery Banks
Connected to Rectifier System
2 Bank Battery * 100Ah
ACME-F 12NDF100

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Battery Current Measurement

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Load measurement on Rectifier System
Load BTS and NodeB = 26.6 A
Load BTS and NodeB
Connected to
RFC1

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Load measurement on Rectifier System
Load RTN= 2.73 A Load FAN = 0.25 A

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Load measurement on Rectifier System
Load FAN
Load RTN

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View Source information's Current Loads:
Rectifier System = 30.96 A
DC Voltage
53.51 Load Current
RECT

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Begin Trial Test
 LLVD parameter setting Through M2000 (Before)

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Begin Trial Test
 LLVD parameter setting Through M2000 (After)

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Load measurement on Rectifier System (AFTER / LLVD OPEN)
View status of DC Voltage a moment after switch off AC Source.
We can see images above, when the Voltage goes down and reached 48.7 VDC,
The loads (BTS) Disconnected (0.5 Adc).
Output Voltage Load BTS and Node B after LLVD Open

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Load measurement on Rectifier System (AFTER / LLVD OPEN)
Load
Disconnected

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View of Loads current
Value of DC Current
on RECT SYST =
8.66 A

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Load Measurements of the Transmissions
The Priority loads still On, during LLVD Open.
Load FANLoad RTN

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Final Conclusion:
 The parameter level for LLVD and BLVD set directly to the Rectifier
system on site.
 The LLVD and BLVD level parameter set only through M2000 and directly
test on site with switch OFF AC Source for the Rectifier.
 The Trial of Decreasing Voltage level with setting the LVD parameter was
successful.
 The NON Priority loads (BTS) which connected to RECTIFIER System
(APM30) are disconnected when the voltage drop to 49.0 VDC (base on
parameter set through M2000)
 The Priority Loads which connected to RECTIFIER System (APM30) still
ON.

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End of Report