Overview
To achieve instantaneous fault clearance for all line faults, the “Scheme communication logic for distance or overcurrent protection” is provided. All types of communication schemes for permissive underreaching, permissive overreaching, blocking, delta based blocking, unblocking and intertrip are available. The built-in communication module (LDCM) can be used for scheme communication signaling when included.
For more detailed information on “Scheme communication logic for distance or overcurrent protection” function, refer to ABB, Relion 670 Series manuals.
To see other supported functions, click here.
Function Identification
| Function description | IEC 61850 identification |
IEC 60617 identification |
ANSI/IEEE C37.2 device number |
| Scheme communication logic for distance or overcurrent protection | ZCPSCH | – | 85 |
Signals & Setting Parameters
ZCPSCH function block
ZCPSCH Input signals
| ZCPSCH Input signals | |||
| Name | Type | Default | Description |
| I3P | GROUP SIGNAL | – | Current group connection |
| U3P | GROUP SIGNAL | – | Voltage group connection |
| BLOCK | BOOLEAN | 0 | Block of function |
| BLKTR | BOOLEAN | 0 | Signal for block of trip output from communication logic |
| BLKCS | BOOLEAN | 0 | Block of carrier send in permissive OR and blocking schemes |
| CSBLK | BOOLEAN | 0 | Reverse directed distance protection zone signal |
| CACC | BOOLEAN | 0 | Permissive distance protection zone signal |
| CSOR | BOOLEAN | 0 | Overreaching distance protection zone signal |
| CSUR | BOOLEAN | 0 | Underreaching distance protection zone signal |
| CR | BOOLEAN | 0 | Carrier Signal Received |
| CRG | BOOLEAN | 0 | Carrier guard signal received |
| CBOPEN | BOOLEAN | 0 | Indicates that the breaker is open |
ZCPSCH Output signals
| ZCPSCH Output signals | |||
| Name | Type | Description | |
| TRIP | BOOLEAN | Trip output | |
| CS | BOOLEAN | Carrier Send signal | |
| CHSTOP | BOOLEAN | Stops the blocking signal to remote end | |
| CRL | BOOLEAN | Carrier signal received or missing carrier guard signal | |
| LCG | BOOLEAN | Loss of carrier guard signal | |
ZCPSCH Group settings (basic)
| ZCPSCH Group settings (basic) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Operation | Off On |
– | – | Off | Operation Off / On |
| SchemeType | Intertrip Permissive UR Permissive OR Blocking DeltaBlocking |
– | – | Permissive UR | Scheme type |
| tCoord | 0.000 – 60.000 | s | 0.001 | 0.035 | Co-ordination time for blocking communication scheme |
| tSendMin | 0.000 – 60.000 | s | 0.001 | 0.100 | Minimum duration of a carrier send signal |
ZCPSCH Group settings (advanced)
| ZCPSCH Group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| Unblock | Off NoRestart Restart |
– | – | Off | Operation mode of unblocking logic |
| DeltaI | 0 – 200 | %IB | 1 | 10 | Current change level in % of IBase for fault inception detection |
| DeltaU | 0 – 100 | %UB | 1 | 5 | Voltage change level in % of UB for fault inception detection |
| Delta3I0 | 0 – 200 | %IB | 1 | 10 | Zero seq current change level in % of IBase |
| Delta3U0 | 0 – 100 | %UB | 1 | 5 | Zero seq voltage change level in % of UBase |
| tSecurity | 0.000 – 60.000 | s | 0.001 | 0.035 | Security timer for loss of carrier guard detection |
ZCPSCH Non group settings (advanced)
| ZCPSCH Non group settings (advanced) | |||||
| Name | Values (Range) | Unit | Step | Default | Description |
| GlobalBaseSelector | 1 – 12 | – | 1 | 1 | Selection of one of the Global Base Value groups |
Logics & highlights
Basic logic for trip signal in blocking scheme
Basic logic for trip signal in delta blocking scheme
Logic for trip signal in permissive scheme
Logic for trip signal in permissive scheme
Guard signal logic with unblocking scheme and with setting Unblock = Restart
Guard signal logic with unblocking scheme and with setting Unblock = NoRestart
