Time synchronization
RT430: GPS Grandmaster Clock

Time synchronization

Main Features

RT430 Grandmaster Clock is the precision time synchronization unit for all digital substations. With 100ns accuracy, Reason GPS clock can be used in the most demanding applications such as Synchronized Phasor Measurement (PMU), fault location by traveling waves, and differential current protections. As the first Grandmaster Clock in accordance with Parallel Redundancy Protocol (PRP), RT430 delivers reliability and security in the distribution of time reference.

  • Better than 100ns time accuracy
  • Precision Time Protocol (PTP) in accordance with IEEE 1588
  • Parallel Redundancy Protocol (PRP) in accordance with IEC 62439-3
  • Time signals in IRIG-B004, IRIG-B124, DCF77 and low frequency pulses
  • NTP/SNTP server using Ethernet port
  • Serial Datagrams through the RS232 and RS422/485 ports
  • High accuracy internal oscillator system
  • Delay compensation for GPS antenna cables
  • Redundant power supply (AC or DC)
 RT430 Manual
 RT430 Datasheet
baixar  RT430 Folder
 More Files


01 – What is the main advantage of PTP protocol when compared to NTP/SNTP?
Both are clock synchronization protocols via Ethernet network and have different characteristics, with modes of management and different precisions. PTP Protocol (Precision Time Protocol) replaces its own clock synchronization network, for example: IRIG-B, ensuring or even improving accuracy levels by compensating information propagation delay between the source of synchronism and destination. More information about PTP can be found in Annex B, of the product manual.

02 -What is the difference between IRIG-B000 and IRIG-B004?
IRIG-B004 includes the characteristics of IRIG-B000 package already with all extensions defined by IEEE1344 standard (DST (daylight saving time), TZ (time zone), year, etc.). Therefore, equipment using IRIG-B000 can be synchronized with IRIG-B004, without problem.

03 – What to do when GPS RT430 does not enter the locked stated?
Locked is the state when the equipment has reached the maximum time accuracy from a minimum number of 4 satellites. For the equipment to enter this state some measures related to product installation must be observed:
– The antenna should be installed perpendicular to the ground, without objects on it and with the greatest possible coverage of the horizon.
– Check that the cable is in perfect condition, and well connected to the antenna and equipment.
– Avoid twisting the cable during installation.
– The antenna cable should not be cut or spliced.
– Check that RT430 is providing 3.3 Vdc at the antenna cable connector output.If the above requirements are being met and yet RT430 does not enter the locked state, contact Reason Technical Support to fix the situation as soon as possible.
Yes. RT430 cable and antenna have the same technical characteristics of the cable and antenna used in RT420.

05 – What is the difference between TTL insulated and non-insulated output?
The great advantage of an insulated output when compared to the conventional output is the insulation of ground wire between panels of the equipment since ground wire of an insulated output is not the same of the equipment housing. Thus favoring the stability of IRIG-B signal and better reliability of equipment as well.

06 – What are the main factors that influence the length of wiring used in electrical installations of IRIG-B synchronization networks?
The length of wiring used in IRIG-B electrical outputs is limited according to quality of the installation, and can be influenced by the following factors:
– Installation Environment (may cause electromagnetic interference or attenuation of IRIG-B signal voltage level)
– Cable type (preferably with insulation mesh and seamless)
– Number of IEDs “hanging” on the same output (may require a current superior to that supported by the output and cause an attenuation of the signal voltage level)
– IED requirement level as for quality of IRIG-B signal received.

07 – How a maximum number of IED can be set to be synchronized by a single IRIG-B electrical output?
Setting the maximum number of IEDs is related to the following factors:
– Supply capacity of IRIG-B output current used. For RT430 this limit is 150mA.
– Values of IRIG-B input impedances of IEDs.
The maximum number of devices can be calculated using the maximum current that can be supplied (150mA), 5V voltage level (TTL) and impedance values of IEDs. Consider the impedances of IEDs in parallel and use the Ohm’s Law in order to find an equivalent combination of impedances that does not require more than 150mA; thus knowing the maximum number of devices that can be used.

08 – It is possible to use RT430 as NTP/SNTP server, and PTP protocol in the same Ethernet port as well?
Yes, provided that the switch enabling functionalities is enabled. Thus the same network port can send PTP e NTP/SNTP packets since they are sent via different UDP ports (123 NTP /310 and 320 PTP).

09 – How the GPS antenna installation should be performed?
Click here to access the antenna installation procedure.

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