The 216NG63 is an Auxiliary DC Power Unit within ABB's RE.216 series of generator protection and control systems. It belongs to the 216NG6. series of DC/DC converters. This unit is specifically designed for industrial environments such as power system substations and power plants. Its primary function is to convert the station battery voltage into a stable 24 V DC power supply, providing reliable operating power for all electronic modules and input/output units in the REG 216 / REC 216 system.
The 216NG63 is suitable for 220 V / 250 V DC station battery systems, with a wide input voltage range of 165 V to 312.5 V DC. It offers a voltage tolerance of ±25%, enabling it to adapt to common voltage fluctuations in power systems.
2. Key Functions
1. Voltage Conversion & Electrical Isolation
The core function of the 216NG63 is to convert a high-voltage DC input (e.g., 220/250 V DC) into the 24 V DC low-voltage power required by the system's electronic equipment. Its internal design utilizes high-frequency switching power supply technology, providing electrical isolation between the input and output. This effectively prevents damage to protection equipment from ground potential differences and interference.
2. Redundant Power Supply Support
The system can be configured for single or dual redundant power supply. In redundant mode, two 216NG63 units operate in parallel to power the system. If one unit fails, the other can continue to maintain normal system operation, significantly enhancing protection reliability.
3. Power Status Monitoring & Alarm
The 216NG63 features comprehensive self-monitoring capabilities:
Front Panel Indicators:
"U IN" Green LED: Indicates input voltage is present.
"U OUT" Green LED: Indicates output voltage is present.
Both LEDs lit simultaneously indicates normal device operation.
Remote Signal Output:
4. Flexible Configuration
The power supply output mode can be flexibly set via plug-in jumpers A and B on the rear of the unit:
Both Jumpers Inserted: The unit supplies power to both the USA and USB bus lines.
Single Supply Mode: The unit supplies power to only one bus line, suitable for non-redundant systems or special configurations.
5. Fault Protection
The 216NG63 has built-in overload and short-circuit protection circuits. If an output abnormality (e.g., short-circuit or overcurrent) is detected, it automatically cuts off the output to prevent device damage, and alerts maintenance personnel via the front panel LEDs or remote signals.
3. Working Principle
1. DC/DC Conversion Principle
The 216NG63 employs high-frequency switching power supply technology. It uses power switching devices (such as MOSFETs or IGBTs) to convert the input DC voltage into a high-frequency AC signal. This is then stepped down via a high-frequency transformer and finally converted back into a stable 24 V DC output through rectification and filtering circuits. This method offers high efficiency, compact size, and excellent voltage regulation.
2. Redundant Power Supply Mechanism
In a redundant system, two 216NG63 units supply power to the independent USA and USB 24 V bus lines, respectively. All electronic modules and I/O units draw power from both of these bus lines. If one power supply fails, the other can still maintain system operation via the remaining bus line, achieving "uninterrupted" power supply.
3. Status Feedback & System Integration
The 216NG63 not only provides power but also communicates with other modules in the system via the B448C parallel bus:
CK Line: Used to send the "Stand-by" status signal.
SML Line: Used to send the "System Defect" alarm signal.
K100 Relay: Provides a potential-free contact output that can be used for remote monitoring or interlocking with other devices.
4. Structure & Hardware Design
1. Mechanical Structure
Mounting: Designed for standard 19″ racks, with a width of 3T (each T=17 mm) and a height of 6U.
Plug-in Design: Supports hot-plugging (must be performed with auxiliary power off), facilitating maintenance and replacement.
Front Panel: Equipped with LED indicators and the main power switch (I/O).
Rear Panel: Features input/output terminals and sockets for plug-in jumpers A and B.
2. Electrical Interfaces
Input Terminals: Connect to the positive and negative terminals of the station battery (UB+ / UB-).
Output Terminals: Provide 24 V DC output to the USA/USB buses and I/O modules.
Communication Interface: Communicates with other electronic units in the system via the B448C bus.
3. Heat Dissipation & Protection
The 216NG63 utilizes natural convection cooling. The housing is designed for effective heat dissipation, suitable for high-temperature operating conditions in industrial environments. The device complies with protection class IP30, preventing the ingress of large solid foreign objects.
5. Configuration & Settings
1. Jumper Settings
Users can set the status of jumpers A and B based on whether the system requires redundant power supply:
Redundant Mode: Jumpers A and B are inserted on both 216NG63 units.
Single Supply Mode: One unit has its jumpers inserted (e.g., supplying the bus), while the other may have them withdrawn (e.g., supplying only I/O modules), depending on the configuration.
2. System Integration
The 216NG63 works in conjunction with the following key modules in the RE.216 system:
216VC62a Processing Unit: Provides system logic and protection functions.
216EA61 Analogue Input Unit: Acquires current/voltage signals.
I/O Units like 216AB61/216DB61: Execute signal output and trip control.
6. Safety & Maintenance
1. Safety Operating Regulations
Strictly Prohibited Live Plugging/Unplugging: All electronic modules may only be inserted or removed after the auxiliary power supply has been switched off.
Dual Power Shutdown: If the system is configured with redundant power supplies, both 216NG63 units must be switched off before working on the rack.
Qualified Personnel: All setup, wiring, and commissioning work must be performed by trained and qualified personnel.
2. Fault Diagnosis
If the "U OUT" LED is off, check the input voltage, jumper settings, and output load.
If an internal fault is suspected (e.g., no output, alarm), contact ABB for repair.
If a remote alarm is triggered, check the status of the K100 relay and bus signals.
3. Repair Policy
Users must not disassemble or modify the internal circuitry or software of the 216NG63. In case of failure, the entire unit must be returned to ABB or an authorized service center for repair. Unauthorized tampering will invalidate any warranty.
7. Application Scenarios
The 216NG63 is widely used in the following power equipment protection and control systems:
Generator Protection Systems (REG 216)
Numerical Control Units (REC 216)
Medium- and High-Voltage Substation Automation Systems
Protection Systems for Large Motors, Power Transformers, and Feeders
