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Home >> ABB >> ABB CB801 3BSE042245R1 PROFIBUS DP panel communication unit

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ABB CB801 3BSE042245R1 PROFIBUS DP panel communication unit

Bay unit (500BU03)

The bay unit (see Fig. 4) is the interface

between the protection and the primary sys tem process comprising the main CTs, isola tors and circuit-breaker and performs the

associated data acquisition, pre-processing,

control functions and bay level protection

functions. It also provides the electrical insula tion between the primary system and the

internal electronics of the protection.

The input transformer module contains four

input CTs for measuring phase and neutral

currents with terminals for 1 A and 5 A. Addi tional interposing CTs are not required,

because any differences between the CT

ratios are compensated by appropriately con figuring the software of the respective bay units.

Optional input transformer module also con tains five input voltage transformers for the

measurement of the three-phase voltages and

two busbar voltages and recording of voltage

disturbances or 6 current transformers for

transformer differential protection. (see Fig. 12).

In the analog input and processing module,

the analog current and voltage signals are

converted to numerical signals at a sampling

rate of 48 samples per period and then

numerically preprocessed and filtered accord ingly. Zero-sequence voltage and zero-current

signals are also calculated internally. The Pro cess data are transferred at regular intervals

from the bay units to the central processing

unit via the process bus.

Every bay unit has 20 binary inputs and 16

relay outputs. The binary I/O module detects

and processes the positions of isolators and

couplers, blocking signals, starting signals,

external resetting signals, etc. The binary

input channels operate according to a pat ented pulse modulation principle in a nominal

range of 48 to 250 V DC. The PC-based HMI

program provides settings for the threshold

voltage of the binary inputs. All the binary out put channels are equipped with fast operating

relays and can be used for either signaling or

tripping purposes (see contact data in Table 8).

A software logic enables the input and output

channels to be assigned to the various func tions. A time stamp is attached to all the data

such as currents, voltages, binary inputs,

events and diagnostic information acquired by

a bay unit.

Where more binary and analog inputs are

needed, several bay units can be combined to

form a feeder/bus coupler bay (e.g. a bus cou pler bay with CTs on both sides of the bus-tie

breaker requires two bay units).

The bay unit is provided with local intelligence

and performs local protection (e.g. breaker

failure, end fault, breaker pole discrepancy),

bay protection (Main 2 or back-up bay protec tions) as well as the event and disturbance

recording.

In the event that the central unit is out of operation or the optical fiber communication is disrupted an alarm is generated, the bay unit will

continue to operate, and all local and bay protection as well as the recorders (event and

disturbance) will remain fully functional

(stand-alone operation).

The hardware structure is based on a closed,

monolithic casing and presented in two

mounting solutions:

• Without local HMI: ideal solution if convenient access to all information via the central unit or by an existing substation

automation system is sufficient.

• With local HMI and 20 programmable LEDs

(Fig. 5): ideal solution for distributed and

kiosk mounting (AIS), since all information

is available in the bay.

For the latter option it is possible to have the

HMI either built in or connected via a flexible

cable to a fixed mounting position (see

Fig. 28).

In the event of a failure, a bay unit can be easily replaced. The replacement of a bay unit

can be handled in a simple way. During system start-up the new bay unit requests its

address, this can be entered directly via its

local HMI. The necessary setting values and

configuration data are then downloaded automatically.

Additional plug-and-play functionality

Bay units can be added to an existing

REB500 system in a simple way.

Fig. 5 Bay unit

Central unit (500CU03)

The hardware structure is based on standard

racks and only a few different module types

for the central unit (see Fig. 4).

The modules actually installed in a particular

protection scheme depend on the size, complexity and functionality of the busbar system.

A parallel bus on a front-plate motherboard

establishes the interconnections between the

modules in a rack. The modules are inserted

from the rear.

The central unit is the system manager, i.e. it

configures the system, contains the busbar

replica, assigns bays within the system, manages the sets of operating parameters, acts as

process bus controller, assures synchronization of the system and controls communication with the station control system.

The variables for the busbar protection function are derived dynamically from the process

data provided by the bay units.

The process data are transferred to the central processor via a star coupler module. Up to

10 bay units can be connected to the first central processor and 10 to the others. Central

processors and star coupler modules are

added for protection systems that include

more than 10 bay units. In the case of more

than 30 bay units, additional casings are

required for accommodating the additional

central processors and star coupler modules

required.

All modules of the central unit have a plugand-play functionality in order to minimize

module configuration.

One or two binary I/O modules can be connected to a central processing unit.

The central unit comprises a local HMI with 20

programmable LEDs (Fig. 6), a TCP/IP port

for very fast HMI500 connection within the

local area network.

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