10.3 OVERCURRENT GROUND RELAYS

The record for an overcurrent ground relay is shown below. The first line must have the words OC GROUND RELAY, starting at column 1. The remaining data starts on the next line and can occupy one or more lines. The data fields up to and including FLAG are for backward compatibility with OneLiner v14. The rest are new data fields in OneLiner v15. The record ends with a blank line.

TDIR; IDIR; RTYP; TTYP; OCPICKUP; LOC; PREV; OPER; POLAR; DCOFF; TADD1; TMUL1; RES; ISTDLY;

RELAY_ID: An identifier for the relay. The relay ID can have up to 20 characters enclosed in quotation marks. The ID must be unique among all the overcurrent relays and fuses in the same relay group.

CTR: CT ratio expressed as a single number, e.g., set CTR to 120 for a 600A:5A CT.

INST: Instantaneous setting in primary amps (3Io). Set INST to 0.0 if the relay has no instantaneous unit.

CANG: Characteristic angle in degrees. CANG is used only if the relay is directional. Please refer to Section 5.2 OVERCURRENT GROUND RELAYS for definition.

TDIR: Time-element directionality flag. Set TDIR to 1 if the time element is directional. Set TDIR to 0 if the time element is not directional.

IDIR: Instantaneous-element directionality flag. Set IDIR to 1 if the instantaneous element is directional. Set TDIR to 0 if the instantaneous element is not directional.

RTYP: Relay type enclosed by quotation marks. The relay type can have at most 12 characters. It must match exactly an available relay type in the Relay Library.

TTYP: Tap type enclosed by quotation marks. The tap type can have at most 8 characters. It must match exactly an available tap type in the Relay Library.

LOC: Location of the CT. Set LOC to 1 if the CT is on the branch terminal. Set LOC to 2 if the relay is on a transformer and the CT is on the neutral of BUS1. Set LOC to 3 if the relay is on a transformer and the CT is on the neutral or inside the delta of BUS2. Set LOC to 4 if the relay is on a Y-Y-D or Auto Y-D 3-winding transformer and the CT is inside the delta of BUS3.

PREV: For backward compatibility with OneLiner 4.0 only. This is set to 0 if the relay operates on 3Io and is polarized by Vo; 1 if the relay operates on 3Io and is polarized by V2; 2 if the relay operates on I2 and is polarized by V2.

OPER: Operating Quantity. Set OPER to 0 if the relay operates on 3Io; 1 if the relay operates on 3I2; 2 if the relay operates on Io. Set OPER to 3 if the relay operates on I2.

POLAR: Directional element logic code. Set to 0 if the relay is polarized by Vo and Io. Set Polar to 1 if polarized by V2 and I2. Set Polar to 2 to simulate SEL negative sequence directional logic. Set Polar to 3 to simulate SEL zero sequence directional logic (additional required settings must be included below).

DCOFF: DC offset. Set DCOFF to 1 if the instantaneous unit is sensitive to the dc offset; 0 if not.

TADD1: Time adder for the inverse time element in seconds. Set TADD to zero if not needed.

TMULT1: Time multiplier for the inverse time element. Set TMULT to 1.0 if not needed.

CTRATIO: CT ratio as string in one of the following format X, X:Y or X/Y. Can have up to 12 characters enclosed in quotation marks.

TAG: Tag string with a maximum of 512 characters. Tags in string are separated by semicolons. Any alpha-numeric characters can be used, except for the string delimiter (single or double quotation mark). The tag string is enclosed in quotation marks.

ASSETID: Asset ID string with a maximum of 128 characters enclosed in quotation marks.

TADD2: Time adder for the definite time element in seconds. Set TADD to zero if not needed.

TMULT2: Time multiplier for the definite time element. Set TMULT to 1.0 if not needed.

FLAG: Device on/off- line flag. Set flag to 1 for on-line device; 2 for off-line device.

TDPICKUPn (n=1-5): Pickup setting of the definite time element 1 to 5 in secondary amps. The settings must be in the ascending order.

TDDELAYn (n=1-5): Delay setting of the definite time element 1 to 5 in seconds. The delays must be in descending order.

MINTRIP: Minimum trip time in seconds.

POLARV15: Directional element logic code for version 15, which can assume the following addition values: 255: Directional element is not available. POLARV15 will overwrite POLAR above.

ONDATE: In-service date. Set to 0 if not available. Otherwise enter an unsigned 32-bit integer that stores the year/month/date information given by the CTime object in the Microsoft Foundation Class.

OFFDATE: Out-of-service date. Set to 0 if not available. Otherwise enter an unsigned 32-bit integer that stores the year/month/date information given by the CTime object in the Microsoft Foundation Class.

TOCDIR: V15 time-element directionality flag. Set TOCDIR to 1 if the time element is forward looking; 2 if it is reverse looking. Set TOCDIR to 0 if the time element is not directional. TOCDIR will overwrite TDIR above.

TDDIR: V15 Instantaneous/definite time element directionality flag. Set TDDIR to 1 if these elements are forward looking; 2 if they are reverse looking. Set TDCDIR to 0 if the instantaneous/definite time elements are not directional. TDDIR will overwrite IDIR above.

SGNLV15: Signal only flag. Enter an integer number with bits set for the corresponding elements that should be treated as signal-only: Bit 1- instantaneous element; Bit 2-for time element; Bit 3 to 7- Definite time element 1 to 5 respectively.

PKGB: Protection package B flag. Enter 1 if true. Otherwise, enter 0.

UDF: User-defined data fields. Enter the list of user defined field values as a tab delimited text string enclosed in single quotes.

If POLARV15 is set to 0 (polarized by Vo and Io) or to 1 (polarized by V2 and I2)

CANGV15: Characteristic angle in degrees. Please refer to Section 5.2 OVERCURRENT GROUND RELAYS for definition.

50VR: Forward direction current 3Io or 3I2 pickup in secondary amperes

50VR: Reverse direction current 3Io or 3I2 pickup in secondary amperes