ABB REG216 Digital Generator Protection Module functions

Parallel bus and electronics unit

The electronics units are of plug-in design and are mounted in equipment racks with a standard size of 19 inches 6U (1U = 44.45 mm).

This rack can be divided into 21 standard partitions.

The data exchange via the parallel bus B448C is controlled and monitored by all available devices.

The protection system is based on a data bus with digital signal processing for most functions;

signal conditioning, analog and digital inputs, A/D conversion, processing and signal output.

The components of the system include

- Static plug-in units, which exchange data via a powerful parallel bus

- Interfaces to the process (main system, station equipment), isolated from the digital processing unit.

Device rack 216MB66/216MB68 and parallel bus B448C

The main features of the parallel bus B448C are

- Specification based on IEEE P 896 (Future Bus)

- Time multiplexing of address and data (16 bits)

- Asynchronous data transfer with handshaking

- Integrity check for each data exchange

- Up to 32 masters with the same status actively access the bus

- Internal 24 V auxiliary power supply common to all electronics units;

redundant 24 V power supplies are available.

Processing unit 216VC62a

- 32-bit processor type 80486DX-2

- Application software in Flash EPROM

- Run data stored in RAM

- Settings on non-volatile flash EPROMs

- Potential-free RS-423 interface for PC operation

- Connection to control station via message transmission

- Time clock synchronization for time stamping of events

- Non-volatile event and disturbance memory (gold capacitor buffer)

- Space required: two racks

Analog input unit 216EA62

- 24 inputs sampled simultaneously, 6 per group

- Sampling frequency 600 (720) Hz, power supply frequency 50 (60) Hz

- Space required: two rack partitions.

Digital Output Unit 216AB61

- 32 outputs for controlling relays that output auxiliary relay assemblies

- Short-circuit proof

- Front panel LEDs to indicate activated relays

- Space required: one rack partition.

Trip output and binary input unit 216DB61

- 8 outputs for bipolar control of auxiliary trip relays

- Monitor Output Amplifier

- 16 digital inputs for signaling auxiliary relay assemblies 

(each two can be used separately to externally enable and prevent tripping)

- Activated outputs and inputs are indicated by LEDs

- Front space requirement: one rack partition.

Auxiliary DC power supply units 216NG61. 216NG62 and 216NG63

- Models for 36 to 312 VDC inputs

- Output 24 VDC, 150 watts

- Short circuit and overload protected outputs

- Parallel connection for higher ratings

- Parallel connection for redundancy (2 outputs)

- Space required: 3 rack partitions.

All protection functions of the REG216 operate on sampled primary system voltage and current.

The analog input unit has a sampling rate of 12 times per cycle and

a dynamic range of 15 bits at the rated power system frequency.

All further signal processing is performed digitally.

As a result, the protection functions are universally applicable, highly accurate and have excellent long-term stability.

Digital filters effectively suppress DC components and harmonics to avoid interference.

The trip logic of the internal protection functions (earlier diode matrix) is controlled by software in the REG216.