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BATTERY CHARGERS
BATTERY CHARGERS
THREE PHASE BATTERY CHARGERS GRR3000-BP Series (Backup-Parallel) INTRODUCTION: GEMTA GRR3000-BP Series battery chargers are most important components of all electrical generation, transmission and distributions systems. The electrical networks equipped with the best protection relays and the circuit breakers are under the potential risks unless they have equally well equipped with power supplies and battery chargers. The most important part of a DC supply system is no doubt the battery charger. Chargers should be able to supply the DC load while charging and also keeping the batteries fully charged. A non-stabilized charger will cause either gas exhaust in the batteries and shorten their lives and also harm the DC system because of the high output voltage or cause the batteries not to be fully charged, shorten the support time in case of a block out discharged easily and by the way, will leave the network unprotected because of its low output voltage. Another facility expected from the battery chargers is their performance of operation without the batteries. In fact, the chargers should never be disconnected from the battery banks. But in some cases, for example, during commissioning tests, the need of DC voltage is supplied by the chargers solely. Another example is the annual maintenance of a substation where there is a pair of charger battery banks. Even in such cases or alike, the output voltage of the charger should never differ from the rated voltage and the ripple factor should not be higher than 5%. The last facility mentioned is very important to protect devices which are supplied by DC power. In the places where use devices that does not include this facility, although when the batteries disconnected from charger, output voltage of the charger does not change, ripple on the output voltage can reach up to 40%. In this case electronic devices which are supplied by DC power can be damaged. This is very important matter for equipment health. Peak value of the charger output voltage should be under 105% when the batteries disconnected from charger. As all GEMTA battery chargers, GRR3000-BP series battery chargers are designed to meet all these specifications. OPERATING PRINCIPLES: GEMTA GRR 3000-BP series battery charger are supplied with three phase supply voltage. Power transformer is delta/wye connected and manufactured proper to the output voltage and current rating. The inductors, L1,L2 and L3 smooth the impulsive currents consumed by the battaries and protect both the thyristor-diode Bridge and the transformer by limiting the currents through them. The thyristor-diode Bridge converts the AC voltage to DC and the average value of this DC voltage is held constant at the desired level by changing the triggering angle of the thyristor by the monitoring circuit. The rectified output voltage of the bridge is smoothened by the filter, which consists of the inductor L4 and the capacitor. Therefore results a fine stabilized DC output voltage, even if the battery bank is not connected. Control circuit watches line voltage and load current changes thyristor triggering angles to keep output voltage steady. Also control circuit keeps the output current in the limitations. There are two meters on the battery charger. The voltmeter shows output voltage of battery charger and ammeter shows load current. GRR3000-BP has a voltage adjustment unit to adjust output voltage. One of the control switches on this unit is Manual / Automatic switch. On manual mode output voltage can be adjusted between 80% and 110% of nominal output voltage. On automatic mode charger tries to adjust output voltage due to charging mode (float / Quick). Charging mode can be set to "quick charge" or "float charge" by means of second switch. OPERATING MODES: System's Operating features are controlled by the switches 'Battery Charger Selection (Backup mode)' and 'Parallel'. Battery Charger Selection: By the startup of the device it provides selection of active and back-up Charger. Parallel Selection: It provides both Battery Chargers operating at the same time. The present load must be equally shared between the two Battery Chargers. To achieve this, the rate of output voltage of both Battery Chargers must be equally adjusted.
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BATTERY CHARGERS
BATTERY CHARGERS
THREE PHASE BATTERY CHARGERS GRR3000-BP Series (Backup-Parallel)
Figure-1
SINGLE LINE DIAGRAM TECHNICAL SPECIFICATIONS: 1-Input Voltage : 3x380V AC / 50Hz 2-Output Voltage : 12 - 24 - 48 - 110 - 220V DC 3-Output Current : 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 -100 -110 - 120A 4-Voltage Stability : ±1% For Variations of 20% in the input voltage 5-Voltage Settings; a- Float Charge : 94-106% of the nominal voltage b- Quick Charge : 102-115% of the nominal voltage c- Manual Charge : 80-110% of the nominal voltage 6-Ripple Factor : Without Battery 5% / With Battery < 1% 7-Temperature Range : -5°C / 40°C 8-Number of Cell; a- 12V DC : 6 Elements b- 24V DC : 12 Elements c- 48V DC : 24 Elements d-110V DC : 54 Elements e-220V DC : 108 Elements 9-Operation Mode; Backup Mode : Automatic - Manuel Parallel Mode : Manual MECHANICAL SPECIFICATIONS: 1-Case : Sheet Metal (ST-37) 2-Case Paint : Ral-7035 Electrostatic Polyester 3-Dimensions : See figure-3
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THREE PHASE BATTERY CHARGERS GRR3000-BP Series (Backup-Parallel)
Figure-2
FRONT PANEL
Figure-3
DEVICE DIMENSIONS
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BATTERY CHARGERS
BATTERY CHARGERS
BATTERY CHARGERS
BATTERY CHARGERS
THREE PHASE BATTERY CHARGERS GRR3000-BP Series (Backup-Parallel)
Figure-4
PACKAGE DIMENSIONS
GRR3000 BP Series DIMENSIONS TABLE(mm)
GRR3000 BP Series APPROX. WEIGHT TABLE (kg)
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