BASLER ELECTRIC BE1-GPS100-E4N1H1N GENERATOR PROTECTION SYSTEM

BASLER ELECTRIC BE1-GPS100-E4N1H1N GENERATOR PROTECTION SYSTEM

BASLER ELECTRIC BE1-GPS100-E4N1H1N GENERATOR PROTECTION SYSTEM

The BE1-GPS100 Generator Protection System is an economical, microprocessor based, multifunction

system that is available in a drawout, H1 (half-rack), S1. and S1 double-ended package. BE1-GPS100

relays provide a comprehensive mix of protective functions to detect generator faults and abnormal

operating conditions in an integrated system. This system is suitable for any generator application and

many utility/co-generation facility Intertie applications. BE1-GPS100 features include:

• Three-phase and Neutral Overcurrent Protection

• Negative Sequence Overcurrent Protection

• Undervoltage and Overvoltage Protection

• Negative Sequence Overvoltage Protection

• Frequency Protection

• Directional Power Protection

• Volts per Hertz Protection

• Loss of Field Protection

• Breaker Failure Protection

• Synchronism Checking

• VT Circuit Monitoring

• Virtual Selector Switches

• General Purpose Timers

• Real-Time Instrumentation

• Reporting Functions

• Communication

• Self Diagnostics

• Logic Programmable (BESTlogic™)

BE1-GPS100 relays have four programmable contact sensing inputs, five programmable outputs, and

one alarm output. Outputs can be assigned to perform protection, control, or indicator operations through

logical programming. For example, protection functions could be programmed to cause a protective trip.

Control functions could be programmed to cause a manual trip, manual close, or automatic reclose.

Indicators could be configured to annunciate relay failure, a settings group change, and others.

Protection scheme designers may select from a number of pre-programmed logic schemes that perform

the most common protection and control requirements. Alternately, a custom scheme can be created

using BESTlogic.

A simplified Getting Started procedure for BE1-GPS100 users is provided in Section 2. Quick Start.

Features

The BE1-GPS100 relay includes many features for the protection, monitoring, and control of power

system equipment. These features include protection and control functions, metering functions, and

reporting and alarm functions. A highly flexible programmable logic system called BESTlogic allows the

user to apply the available functions with complete flexibility and customize the system to meet the

requirements of the protected power system. Programmable I/O, extensive communication features, and

an advanced HMI (human-machine interface) provide easy access to the features provided.

The following information summarizes the capabilities of this multifunction device. Each feature, along

with how to set it up and how to use its outputs is described in complete detail in the later sections of this

manual.

Input and Output Functions

Input functions consist of Power System Measurement and Contact Sensing Inputs. Programmable

Contact Outputs make up the output functions. Input and Output functions are described in the following

paragraphs.

Power System Measurement Functions

Three-phase currents and voltages are digitally sampled and the fundamental is extracted using a

Discrete Fourier Transform (DFT) algorithm. Digital sampling of the measured frequency provides high

accuracy at off-nominal values.

The voltage sensing circuits automatically configure themselves internally for single-phase, three wire or

four wire voltage transformer circuits. Voltage sensing circuitry provides voltage protection, frequency

protection, and watt/var metering. Neutral (residual) and negative sequence voltage magnitudes are

derived from the three-phase voltages. An auxiliary voltage sensing input provides protection capabilities

for over/undervoltage monitoring of the first and third harmonic of the VT source connected to the Vx

input. This capability is useful for stator ground fault protection and sync-check functions.

Each current sensing circuit is low burden and isolated. Neutral (residual) and negative sequence current

magnitudes are derived from the three-phase currents. An optional independent ground current input is

available for direct measurement of the current in a transformer neutral, tertiary winding, or flux balancing

current transformer.

Contact Sensing Inputs

Four programmable contact sensing inputs (IN1. IN2. IN3. and IN4) with programmable signal

conditioning provide a binary logic interface to the protection and control system. Each input function and

label is programmable using BESTlogic. A user-meaningful label can be assigned to each input and to

each state (energized and de-energized) for use in reporting functions.

Contact Outputs

Five programmable general-purpose contact outputs (OUT1. OUT2. OUT3. OUT4. and OUT5) provide a

binary logic interface to the protection and control system. One programmable, fail-safe contact output

(OUTA) provides an alarm output. Each output function and label is programmable using BESTlogic. A

user-meaningful name can be assigned to each output and to each state (open and closed) for use in

reporting functions. Output logic can be overridden to open, close, or pulse each output contact for testing

or control purposes. All output contacts are trip rated.

Protection and Control Functions

Protection functions consist of Overcurrent, Voltage, Frequency, Power, Fuse Loss, Breaker Failure

Protection, and general-purpose logic timers. Setting Groups and Virtual Control Switches make up the

control functions. The following paragraphs describe each protection and control function.

Overcurrent Protection

Phase and one neutral instantaneous overcurrent elements (50TP and 50TN) with settable time delays

provide inadvertent energization protection when properly supervised by voltage and/or frequency

elements (381. 159. 127).

One phase time-overcurrent element can be voltage restrained (51/27R) or voltage controlled (51/27C) to

provide system backup overcurrent protection (51P).

Two neutral inverse time-overcurrent elements provide ground overcurrent protection and/or generator

step-up (GSU) transformer ground backup protection (51TN and 151TN).

Each neutral 50/51 element can be assigned to monitor either the three-phase residual (IN

) or the optional

independent ground input (IG

).

One inverse time, negative sequence overcurrent element provides generator unbalance overload

protection (46).

Time-overcurrent functions employ a dynamic integrating timing algorithm covering a range from pickup to

40 times pickup with selectable instantaneous or integrated reset characteristics.

Time-overcurrent curves conform to the IEEE C37.112 document and include seven curves similar to

Westinghouse/ABB CO curves, five curves similar to GE IAC curves, four IEC curves, a fixed time curve,

and a user programmable curve. Each time current characteristic can be set for integrating or

instantaneous reset.

Digital signal processing filters out unwanted harmonic components while providing fast overcurrent

response with limited transient overreach and over-travel.

Voltage Protection

One volts per hertz protective element provides overexcitation protection for a generator and/or GSU

transformer (24).

Two phase overvoltage and two phase undervoltage element provides over/undervoltage protection (27P,

127P, 59P, and 159P). Phase overvoltage protection can be set for one of three, two of three, or three of

three logic. When a four-wire voltage transformer connection is used, overvoltage protection can be set

for either phase-to-phase voltage or phase-to-neutral voltage.

Two auxiliary overvoltage and two auxiliary undervoltage elements provide over/undervoltage protection

(27X, 127X, 59X, and 159X). Auxiliary voltage protection elements can be set to individually monitor the

auxiliary voltage fundamental, third harmonic, or phase 3V0 voltages. Complete stator ground fault