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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 System Battery Rack

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View details Rectifier Systems

Equipment Connected 3*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 FAN Load 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