Basler BE1-11g Instruction Manual page 17

9424200994 Rev U 5
Fault Reporting
Fault reports consist of simple target information, fault summary reports, and detailed oscillography
records to enable the user to retrieve information about disturbances in as much detail as is desired. The
BE1-11g records and reports oscillography data in industry-standard IEEE, COMTRADE format to allow
®
using any fault analysis software. Basler Electric provides a Windows based program called
BESTwave™ that can read and plot binary or ASCII format files that are in the COMTRADE format. A
copy of BESTwave is included on the BE1-11 product CD.
Sequence of Events Recorder
A Sequence of Events Recorder (SER) records and time stamps all BE1-11g inputs and outputs as well
as all alarm conditions monitored by the BE1-11g. Time stamp resolution is to the nearest half-cycle. I/O
and Alarm reports can be extracted from the records as well as reports of events recorded during the time
span associated with a specific fault report.
Protection and Control
The BE1-11g includes protection elements that monitor voltage, current, power, phase angle, frequency,
temperature, and more to provide protection against faults and abnormal operating conditions. Control
elements make the BE1-11g capable of controlling complex distribution configurations. The following
paragraphs describe each protection and control function.
Overexcitation (24) Protection
One volts per hertz protection element provides overexcitation protection for a generator and/or
transformer.
Sync-Check (25) Protection
With the auxiliary voltage input connected to the bus, one sync-check function provides synchronism
protection. Sync-check protection checks for phase angle difference, magnitude difference, frequency
difference (slip) and, optionally, if the three-phase VT frequency is greater than the auxiliary VT
frequency. One voltage monitor output (25VM) provides independent dead/live voltage closing logic.
Undervoltage (27P) and Overvoltage (59P) Protection
Five phase undervoltage and four phase overvoltage elements are included. Phase
undervoltage/overvoltage protection can be set to operate when one, two, or three phases decrease
below the pickup level. When a four-wire voltage transformer connection is used, under/overvoltage
protection can be set for either phase-to-phase voltage or phase-to-neutral voltage. The 27P elements
are equipped with an undervoltage inhibit feature. Inverse or definite time can be selected.
Auxiliary Undervoltage (27X) and Auxiliary Overvoltage (59X) Protection
Four auxiliary overvoltage and four auxiliary undervoltage elements provide over/undervoltage protection.
Auxiliary voltage protection elements can be set to monitor separately the third harmonic, neutral-shift,
positive-sequence, negative-sequence, or auxiliary fundamental voltages. Ground unbalance protection is
provided when the auxiliary voltage input is connected to a source of 3V0 such as a broken-delta VT or
when 3V0 mode is selected to obtain calculated offset voltage from the phase quantities. The 27X is
equipped with an undervoltage inhibit feature. Inverse or definite time can be selected.
Vector Jump (78) Protection
One vector jump protection element protects the generator by disconnecting it from the grid when a loss
of mains or mains failure occurs, preventing the generator from remaining tied to the mains if the mains
returns due to an external reclose device.
Frequency (81) Protection
Eight independent frequency elements can be set for over, under, or rate of change (81R) frequency
operation. Each can be set separately to monitor the frequency on the main three-phase voltage input or
the Vx input. Rate of change can be set to operate on positive, negative, or "either".
BE1-11g Introduction