Schweitzer Engineering Laboratories SEL-734 - Sag;Swell;Interruption (SSI) Report

6.11
Date Code 20090730 Instruction Manual SEL-734 Meter
Power Quality and Event Analysis
Sag/Swell/Interruption (SSI) Report
Sag/Swell/Interruption (SSI) Report
Figure 6.5 ACSELERATOR QuickSet VSSI Report With CBEMA/ITIC and Disturbance Analysis
See Figure 6.7 and Figure 6.8 for example SSI reports.
The VSSI report captures voltage disturbances and displays summary or
detailed information per IEC 61000-4-30 and CBEMA/ITIC. The SEL-734
reports VSSI disturbances through the SER, SEL ASCII,
ACSELERATOR
QuickSet, and DNP3 interfaces. The
ACSELERATOR QuickSet software
interface includes graphical representation of disturbances with additional
analysis options as shown in Figure 6.5.
The SEL-734 records VSSI data using an adaptive sampling rate algorithm
that maximizes the number of disturbances that the meter can store. Given
typical conditions, the SEL-734 will capture at least 20 independent
disturbances and a minimum of 2048 detailed entries. Sampling rates include
Fast recording at 4 samples per cycle, medium recording at 1 sample per
cycle, slow recording at 1 sample per 64 cycles, and daily at 1 sample per day.
VSSI Settings
The group setting ESSI = Y enables the voltage sag/swell/interruption
reporting. The VBASE setting defines the nominal phase-to-neutral voltage
applied to Form 9 connections, and phase-to-phase voltage applied to Form 5
connections. The VINT, VSAG, and VSWELL trigger thresholds define the
percentage of VBASE at which the meter records a disturbance. Hysteresis
settings, VINTHYS, VSAGHYS, and VSWELHYS, define the percentage
above the trigger thresholds at which the VSSI report stops recording.
VSSI Initialization
The following conditions must be met before the VSSI function will capture
voltage disturbances:
➤ The phase voltage is greater than 25V
➤ The FAULT Meter Word Bit is deasserted.
➤ Ten seconds have elapsed meeting these conditions.
VSSI Summary Report
The VSSI report in the ACSELERATOR QuickSet HMI interface or the SSI S
SEL ASCII command will display summary VSSI reports as shown in
Figure 6.6. Upon a voltage disturbance, the VSSI will report the type, date,
time, duration, and min/max voltage magnitude in compliance with IEC
Courtesy of NationalSwitchgear.com