Basler Electric DECS-250 – CN2CN 1N Digital Excitation Control System Unit

Basler Electric DECS-250 – CN2CN 1N Digital Excitation Control System Unit

output contact including OUTA. Over 20 alarm conditions are available to be monitored including user

definable logic conditions using BESTlogic.

Active alarms can be read and reset from the front panel HMI or from the communication ports. A

historical sequence of events report with time stamps lists when each alarm occurred and cleared. These

reports are available through the communication ports.

Version Report

The version of the embedded software (firmware) is available from the front panel HMI or the

communication ports. The unit serial number and style number is also available through the

communication port.

BESTlogic™ Programmable Logic

Each BE1-GPS100 protection and control function is implemented in an independent function element.

Every function block is equivalent to its single function, discrete device counterpart so it is immediately

familiar to the protection engineer. Each independent function block has all of the inputs and outputs that

the discrete component counterpart might have. Programming with BESTlogic is equivalent to choosing

the devices required by your protection and control scheme and then drawing schematic diagrams to

connect the inputs and outputs to obtain the desired operating logic.

Several preprogrammed logic schemes and a set of custom logic settings are provided. A

preprogrammed scheme can be activated by merely selecting it. Custom logic settings allow you to tailor

the relay functionality to match the needs of your operation’s practices and power system requirements.

Write Access Security

Security can be defined for three distinct functional access areas: Settings, Reports, and Control. Each

access area can be assigned its own password. A global password provides access to all three functional

areas. Each of the four passwords can be unique or multiple access areas can share the same password.

A second dimension of security is provided by allowing the user to restrict access for any of the access

areas to only specific communication ports. For example, you could set up security to deny access to

control commands from the rear RS-232 port that is connected through a modem to a telephone line.

Security settings only affect write access. Read access is always available in any area through any port.

Human-Machine Interface (HMI)

Each BE1-GPS100 comes with a front panel display with five LED indicators for Power Supply Status,

Relay Trouble Alarm, Minor Alarm, Major Alarm, and Trip. The lighted, liquid crystal display (LCD) allows

the relay to replace local indication and control functions such as panel metering, alarm annunciation, and

control switches. Four scrolling pushbuttons on the front panel provide a means to navigate through the

menu tree. Edit and Reset pushbuttons provide access to change parameters and reset targets, alarms

and other registers. In Edit mode, the scrolling pushbuttons provide data entry selections. Edit mode is

indicated by an LED on the Edit pushbutton.

The LCD has automatic priority logic to govern what is being displayed on the screen so that when an

operator approaches, the information of most interest is automatically displayed without having to

navigate the menu structure. The order of priorities is:

1. Targets

2. Alarms

3. Programmable automatic scrolling list

Up to 16 screens can be defined in the programmable, automatic scroll list.

Communication

Three independent, isolated communication ports provide access to all functions in the relay. COM 0 is a

9-pin RS-232 port located on the front of the case. COM 1 is a 9-pin RS-232 port located on the back of

the case. COM 2 is a two wire RS-485 port located on the back of the case.

An ASCII command interface allows easy interaction with the relay, using standard, off the shelf

communication software. The ASCII command interface is optimized to allow automation of the relay

setting process. Settings files can be captured from the relay and edited using any software that supports

the *.txt file format. These ASCII text files can then be used to set the relay using the send text file

function of your communication software.

ASCII, Modbus™, DNP3. and Basler TNP protocols are optionally available for the RS-485

communication port. A separate instruction manual is available for each available protocol. Consult the

product bulletin or the factory for availability of these options and instruction manuals.

Primary Applications

The BE1-GPS100 Generator Protection System provides three-phase, ground, negative sequence

overcurrent, voltage, reverse power, loss of excitation, volts per hertz, and sync-check protection. It is

intended for use in any generator protection application. Its unique capabilities make it ideally suited for

applications where:

• Wide setting range, multiple setting groups, multiple coordination curves, and versatile

programmable logic is desired in one unit.

• One economical, space-saving unit provides all protection, control, metering, and local and

remote indication functions.

• Applications where a small-size relay with limited behind-panel projection facilitates modernizing

protection, metering, and control systems in existing substations is desired.

• Protection redundancy is desired by having differential relaying in an independent, protective

relaying package.

• Communication and protocol support is required.

• Drawout construction is desired.

• High accuracy across a wide frequency range is required.

• The capabilities of intelligent electronic devices (IEDs) are used to decrease relay and equipment

maintenance costs.

Model and Style Number Description

General

The BE1-GPS100 Relay electrical characteristics and operational features are defined by a combination

of letters and numbers that make up the style number. The model number, together with the style

number, describe the options included in a specific device and appear in the clear window on the front

panel and on a sticker located inside the case. Upon receipt of a relay, be sure to check the style number

against the requisition and the packing list to ensure that they agree.

Sample Style Number

Style number identification chart, Figure 1-1. defines the electrical characteristics and operational features

included in BE1-GPS100 Relays. For example, if the style number were E3N1R0U, the device would

have the following characteristics and features:

BE1-GPS100 —

(E)  – 5 ampere nominal system with 5 ampere independent ground input

(U)  – Three-phase voltage sensing – Not applicable – 48/125 Vac/Vdc power supply – Single ended case, normally open alarm output – ASCII communication – Battery backup for real time clock