IS200ADIIH1A Rail contact input

Each CT input is allocated to one dedicated bay function block. This function block is used to provide complete user interface for all signals from and towards this bay. It is also used to influence bay measured current.

It is possible by a parameter setting CTConnection to connect or disconnect the CT input to the bay function block. Once the CT input is connected to the bay function block this associated current input can be included to or excluded from the two internally available differential functions in software. This can be done by a parameter setting for simple station layouts (that is, one-and-a-half breaker stations) or alternatively via dedicated logical scheme (that is, double busbar stations).

For each bay the end user have to select one of the following five alternatives:

• Permanently connect this bay current to zone A (that is, ZA)

• Permanently connect this bay current to zone B (that is, ZB)

• Permanently connect this bay current to zone A and inverted bay current to ZB (that is, ZA and -ZB)

• Connect this bay current to ZA or ZB depending on the logical status of the two input binary signals available on this bay function block. These two input signals will include measured current to the respective zone when their logical value is one (that is, CntrlIncludes). This option is used together with above described Switch function blocks in order to provide complete Zone Selection logic

• Connect the bay current to ZA or ZB depending on the logical status of the two input binary signals available on this bay function block. These two signals will include measured current to the respective zone when their logical value is zero (that is, CntrlExcludes).

This option is typically used when only normally closed auxiliary contacts from the busbar disconnector are available to the Zone Selection logic

IS200ADIIH1A Rail contact input

Typically CT secondary circuits from every bay in the station are connected to the busbar protection.

The built-in software feature called “Zone Selection” gives a simple but efficient control over the connected CTs to busbar protection IED in order to provide fully operational differential protection scheme for multi-zone applications on both small and large buses.

The function consists of dedicated disconnector/circuit breaker status monitoring algorithm, bay dedicated CT-connection control algorithm and zone interconnection algorithm.

Switch status monitoring For stations with complex primary layout (that is, double busbar single breaker station with or without transfer bus) the information about busbar disconnector position in every bay is crucial information for busbar protection. The positions of these disconnectors then actually determine which CT input (that is, bay) is connected to which differential protection zone. For some more advanced features like end-fault or blind-spot protection the actual status of the circuit breaker in some or even all bays can be vital information for busbar protection as well.

The switch function block is used to take the status of two auxiliary contacts from the primary device, evaluate them and then to deliver the device primary contact position to the rest of the zone selection logic. For such applications typically two auxiliary contacts (that is, normally open and normally closed auxiliary contacts) from each relevant primary switching object shall be connected to the IED.

Then the status for every individual primary switching object will be determined. The dedicated function block for each primary switching object is available in order to determine the status of the object primary contacts.

By a parameter setting one of the following two logical schemes can be selected for each primary object individually by the end user:

• If not open then closed (that is, as in RADSS schemes)

• Open or closed only when clearly indicated by aux contact status (that is, as in INX schemes)

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