Limit Alarms; System Control And Monitoring; System Time, Phase And Frequency; Phasors - Arbiter Systems Power Sentinel 1133A Operation Manual

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12.15

Limit Alarms

Limit alarms may currently be defined and set through PSCSV software and include alarming to
the display, memory and through any of the communication channels.
Functions
Output
Interface
12.16

System Control and Monitoring

Combining DSP and GNSS technology, the 1133A can measure time-dependent electrical system
quantities and display them on the front panel or record them for future use. To record System
Time, Phase and Frequency data, see Chapter 7 on using PSCSV software.
12.16.1

System Time, Phase and Frequency

"System" refers to the electrical system under measurement. By comparing the generated system
time and frequency to the GNSS signal as a reference, the 1133A can measure and record the
(integrated) difference in time and frequency, as well as other time-related system facts.
System Time
Frequency
System Phase
Effect of DC
12.16.2

Phasors

Standard
Rate
Interface
Upper or lower limits may be set on most measured
functions. Limits may also be set on maximum imbalance
(ratio of Zero and Negative Sequence Components to
Positive Sequence).
Via system interface and display or contact closure
Configure and read with PSCSV (see "Configuring Mul-
timode Relays" in Section 7.10).
Unlimited accumulation with
7 digits, xx.xxxxx Hz
0 360 degrees with 0.01 degree resolution
None; Rejected by narrow band digital filtering
Per IEEE Synchrophasor Standard C37.118
Depends on nominal frequency; 1
second for 50 Hz, 1
Hz
User configured through PSCSV (see Configure Ports –
C37.118 Synchrophasor Protocol). Uses SERIAL 1 and
SERIAL 2 (RS-232, RS-485 or Modem) and the Ethernet
port, and UDP Broadcast mode uses the Ethernet port.
Technical Specifications and Operational Parameters
1-µs resolution
50 measurements per
60 measurements per second for 60