Excitation unit outlet device 3BSE004214R1


External connections:
• Excitation current to the load cells
• 2 or 4 analog inputs for load cell signals
• 4 analog outputs, voltage or current
• 8 digital inputs for control signals
• 8 digital outputs
• +24 V supply for external units, max 0.5 A
• Ethernet connection
• Service and multiple control units
• 2 serial interfaces of type RS-232 for
external displays, control, etc.


Category: SKU: 3BSE004214R1 Tag:
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Contacts:kelly CHEN


Excitation unit outlet device 3BSE004214R1

Excitation unit outlet device 3BSE004214R1


Negative sequence polarization has the following advantages compared to zero sequence polarization: • on solidly earthed systems U2 may be larger than U0 .

If the bus behind the IED location is a strong zero-sequence source, the negative sequence voltage available at the IED location is higher than the zero-sequence voltage.

• negative sequence polarization is not affected by zero sequence mutual coupling (zero sequence polarized directional elements may misoperate in parallel lines with high zero-sequence mutual coupling and isolated zero sequence sources).

• negative sequence polarization is less affected by the effects of VT neutral shift (possible caused by unearthed or multiple earths on the supplying VT neutral)

• no open-delta winding is needed in VTs as only 2 VTs are required (U2 = (UL12 – a · UL23)/3) The zero sequence current polarized earth directional unit compares zero sequence current I0 of the line with some reference zero-sequence current, for example the current in the neutral of a power transformer.

The relay characteristic AngleRCA is fixed and equals 0 degrees. Care must be taken to ensure that neutral current direction remains unchanged during all network configurations and faults, and therefore all transformer configurations/constructions are not suitable for polarization.

In dual polarization, zero sequence voltage polarization and zero sequence current polarization elements function in a “one-out-of-two mode”



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