Basler Electric BE1-11g - Manual (Page 81)

9424200994 Rev N 69
Auxiliary Overvoltage (59X) Protection
Four auxiliary overvoltage (59X) elements monitor the phase and auxiliary voltage applied to the
BE1-11g. An element can be configured to protect against overvoltage by monitoring neutral-shift voltage,
positive-sequence voltage, negative-sequence voltage, fundamental voltage on the Vx input, or third-
harmonic voltage on the Vx input.
The four, identical auxiliary overvoltage protection elements are designated 59X-1, 59X-2, 59X-3, and
59X-4. Element logic connections are made on the BESTlogic
™Plus screen in BESTCOMSPlus® and
element operational settings are configured on the Overvoltage (59X) settings screen in BESTCOMSPlus.
A summary of the logic inputs and outputs and operational settings appears at the end of this chapter.
BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Voltage, Overvoltage (59X)
HMI Navigation Path: Settings Explorer, Protection, Settings Group x (where x = 0 to 3), Voltage
Protection, Overvoltage 59X
Element Operation
Auxiliary overvoltage protection can be used to protect equipment from damage caused by phase failure,
positive/negative phase sequence, or phase unbalance.
Modes of Protection
Five modes of protection are available: 3V0, V1, V2, Vx Fundamental, and Vx Third Harmonic.
3V0 Mode
3V0 mode provides voltage unbalance protection in a three-phase system. The 3V0 measurement
increases as the three-phase voltages become unbalanced.
V1 Mode
V1 mode provides positive phase-sequence protection in a three-phase system. The V1 measurement
increases as the phase sequence is brought forward.
V2 Mode
V2 mode provides negative phase-sequence protection in a three-phase system. The V2 measurement
increases as voltage becomes unbalanced or the phase sequence is reversed.
Vx Fundamental Mode
Vx Fundamental mode provides ground offset detection on high impedance ground systems or phase
overvoltage protection in sync-check applications.
Vx Third Harmonic Mode
Vx Third Harmonic mode detects an increase in third harmonic.
Connections
Connections are made on the rear of the BE1-11g. The phase VT inputs (Va, Vb, Vc) are used when 3V0,
V1, or V2 mode is selected. The auxiliary VT input (Vx) is used when Vx Fundamental or Vx Third
Harmonic mode is selected. For an illustration of terminals, refer to the
Terminals and Connectors
chapter.
Sensing Configuration
When using the Vx input, setting the Aux VT Connection parameter provides the correct labeling of
settings and metering data found in BESTCOMSPlus and fault reports. The Aux VT Connection
parameter set to AB, for example, will display the metering data as AB in fault records and display the
BE1-11g Auxiliary Overvoltage (59X) Protection