Protection Relays

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  3A300 Pilot Wire DC Intertrip System

  The 3A300 has been designed to integrate a complete scheme allowing bi-directional group intertripping of up to four remotely connected sites. Inherent 5KV or 15KV isolation allows application on electrical networks where large induced voltages may be experienced on the pilots. System reliability is provided by the extensive built in supervision facilities. Security is achieved through the high isolation & AC immunity of the intertrip receive elements. The efficient compact…
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  3A400 Pilot Wire Supervision System

  The 3A400 concept is based on the need to improve the performance of existing pilot wire protection schemes by increasing reliability & availability as well as adding an over current guard function. With the 3A400 this can be achieved at considerably lower cost than the replacement of the existing proven protection relays & change over to a fibre optic communication channel. A revised protection scheme using the 3A400 comprises the…
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  4D200 Tap Position Indicator (TPI) Display Module

  The 4D200 is specifically designed for operation with the RMS type 2V200 TPI to frequency transducer. The 2V200 provides a noise immune interface between the tap changer & the 4D200 via a 0 to 5KHZ frequency signal. Alternatively the 4D200 may be configured to accept a BCD coded input direct from the tap changer or via a voltage to BCD transducer. Where an RMS 2V164 Voltage Regulating Relay is being…
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  6RA20 CT Shorting Relay

  The 6RA20 CT Shorting relays are a special derivative of the standard 6R MATRIX auxiliary relay. This model range has been designed specifically for CT shorting. All relay versions are supplied fitted with heavy duty contacts to achieve high voltage isolation across open contacts & high short term carry current. Contacts are constructed from solid silver, shaped & positioned to ensure very reliable, low resistance operation. Over travel of the…