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1 Introduction
PCS-9785 Satellite-Synchronized Clock
1-1
Date: 2019-07-05
1.1 Overview
The PCS-9785 satellite-synchronized clock is usually used in Substation Automation System (SAS)
to satisfy the time unifying requirements of protection relay, disturbance fault recorder and other
IEDs. Two kinds of PCS-9785 can be adopted to build a higher reliable and accuracy clock
synchronization system in substation. The source clock can receive timing signals from its own
GPS/BDS antenna (Master Mode), while the extension clock receives IRIG-B signals from another
clock source (Slave Mode).
PCS Serial
Protection Relay & BCU
PCS-9785
Satellite-Synchronized
Clock (Source)
Other IEDs
PCS-9794
Protocol Converter
Data transmission bus (Network)
Satellite Timing Signal
Clock Synchronization bus
Coaxial cable
PCS Serial
Protection Relay & BCU
Other IEDs
PCS-9794
Protocol Converter
Clock Synchronization bus
IRIG-B Signal
PCS-9785
Satellite-Synchronized
Clock (Extension)
1.2 Features
Remote supervision
This device supports local SCADA and remote control centre communication in using of
protocols such as IEC 61850 Ed1.0 & Ed2.0 to realize the device running status supervision.
Time service
This device supports GPS (Global Positioning System) and BDS (BeiDou Navigation Satellite
System). In addition, it supports antenna transmission time delay compensation.
Signal reception
This device provides several reception channels for IRIG-B signal via its optical port or
RS-485/422 port. In addition, it supports link-based reception time delay compensation.
High accuracy
The device accuracy is high in long term. The punctual error is less than 1μs per hour.
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