Protective Relay Systems BE1-40Q, Loss of Excitation Relay

Protective Relay Systems

BE1-40Q, Loss of Excitation Relay

These relays provide protection for synchronous generators from extensive damage by detecting loss-of-field excitation.

— Product Features & Benefits

Accurate protection provided by true var measurement.

Minimized CT and PT costs as a result of low sensing burden.

Reduced battery load with low burden power supply.

Accurate, repeatable, and reliable operation.

Simple HMI provides clear and intuitive settings for easy configuration.

LED targets provide clear annunciation of status.

Easily perform in-case system and device tests using test paddles.

Directional Power Protection

One directional power element (32) is included in the BE1-951 and can be set for forward or reverse

power protection. The relay can be used for any application requiring directional power flow detection

including intertie protection (interconnects between an electric utility and a source of non-utility

generation). The power measurement algorithm is adapted as appropriate for any possible three-phase or

single-phase voltage transformer connection. Directional Power is calibrated on a three-phase basis

regardless of the voltage transformer connection used.

Frequency Protection

Six over/underfrequency protection function blocks are provided: 81. 181. 281. 381. 481. and 581. Each

function block can be set for overfrequency or underfrequency operation.

Breaker Failure Protection

One breaker failure protection block (BF) provides programmable breaker failure protection.

Fuse Loss Protection

A fuse loss function protects against false tripping due to a loss of voltage sensing.

General Purpose Logic Timers

Two general-purpose logic timers (62. 162) with six modes of operation are provided.

Setting Groups

Four setting groups allow adaptive relaying to be implemented to optimize BE1-951 settings for various

operating conditions. Automatic and external logic can be employed to select the active setting group.

Virtual Control Switches

BE1-951 virtual control switches include one virtual breaker control switch and four virtual switches.

Trip and close control of a selected breaker can be controlled by the virtual breaker control switch (101).

The virtual breaker control switch is accessed locally from the front panel human machine interface (HMI)

or remotely from the communication ports.

Additional control is provided by the four virtual switches: 43. 143. 243. and 343. These virtual switches

are accessed locally from the front panel HMI or remotely from the communication ports. Virtual switches

can be used to trip and close additional switches or breakers, or enable and disable certain functions.

Virtual Lockout Protection

The BE1-951 includes two virtual lockout functions (86 and 186) that emulate electric reset lockout relays

and operate as a simple flip/flop. When the trip input is asserted, the output of the function toggles to the

true state and when the reset input is asserted, the output of the function toggles to the false state. If both

inputs are asserted at the same time, the trip input always has priority. The state of the lockout (latch) is

stored in non-volatile memory.

Metering Functions

Metering is provided for all measured currents, voltages, and frequency and all derived neutral and

negative-sequence currents and voltages. Three phase watts, vars, and power factor is provided. Per

phase watts and vars is also provided when the VT connection is 4W.

Reporting and Alarm Functions

Several reporting and alarm functions provide fault reporting, demand, breaker, and trip circuit monitoring,

as well as relay diagnostic and firmware information.

Energy Data Reporting

Energy information in the form of watt-hours and var-hours is measured and reported by the BE1-951.

Both positive and negative values are reported in three-phase, primary units.

Relay Identification

Two free-form fields are provided for the user to enter information to identify the relay. These fields are

used by many of the reporting functions to identify the relay that the report is from. Examples of relay

identification field uses are station name, circuit number, relay system, purchase order, and others.