The device requires certain basic data regarding the protected equipment, so that the device will be compatible with its desired application. Phase sequence data, nominal system frequency data, CT&PT ratios and their physical connections, as well as, breaker operating times and minimum current thresholds are selected in the 3RZHU
6\VWHP'DWD display.
To modify these settings from the front of the device, the user should press the key and wait for the 0$,10(18 to appear. From the 0$,10(18, the user should use the key to select 6HWWLQJV, and then use the key to navigate to the 6(77,1*6 display. To obtain the 36\VWHP'DWD display, the user should use the key to select 36\VWHP'DWD in the 6(77,1*6 display, and then press the key.
To modify settings associated with 3RZHU6\VWHP'DWD using DIGSI®4, the user should double-click 6HWWLQJV, and then 3RZHU6\VWHP'DWD, and the desired selection options will be displayed.
Polarity of Current Transformers
At address &76WDUSRLQW, the polarity of the wye-connected current trans-formers is specified (see Figure 6-8 for options). Modifying this setting also results in a polarity reversal of the ground current inputs IN or INS.
Figure 6-8 Current Transformer Polarity
MENU
VT’s and CT’s Nominal Values
At addresses 9QRP35,0$5< and 9QRP6(&21'$5<, information is en-tered regarding the rated primary nominal voltage and rated secondary nominal volt-ages (L-L) of the connected voltage transformers. At addresses &735,0$5<
and &76(&21'$5<, information is entered regarding the primary and second-ary ampere ratings of the current transformers. It is important to note that the primsecond-ary ampere rating of the current transformers is based on the actual tapped connection of the current transformers’ secondary winding (i.e. for a 1200/5 ampere multi-ratio cur-rent transformer connected at a 600/5 ampere tap, the user should enter a value of 600 for &735,0$5<and a value of 5 for &76(&21'$5<). It is also important to ensure that the rated secondary current of the current transformer matches the rated current of the device, otherwise the device will incorrectly calculate primary amperes.
VT’s and CT’s Ra-tios
Data describing the connection of the current transformers and voltage transformers is entered at addresses , and .
Address 9SK9GHOWD corresponds to the factor by which the secondary phase-to-ground voltage must be adjusted relative to the secondary displacement voltage (zero sequence voltage), and only applies in situations where the displacement volt-age is actually measured by the device as opposed to calculated by the device.
When the voltage transformers are connected as shown in Figure A-12 of Appendix Section A3, the relationships between the secondary device input voltages and the pri-mary phase-to-ground and displacement voltages are given as follows:
For the secondary input voltages representing phase-to-phase voltages:
For the secondary input voltage representing displacement voltage:
Since the per unit base values of the phase-to-ground voltage and the displacement voltage are equivalent, Vsec-input / Vprim-φg should equal Vsec-input / Vprim-disp.
To compensate for the voltage transformer connection, the device must adjust the secondary phase-to-ground voltage upward by a factor of √3. Therefore, in this case, address would be set at 1.73 (= √3).
For situations where displacement voltage is measured by the device and other types of voltage transformer connections are utilized, the setting at address should be modified accordingly.
Address corresponds to the factor by which the ground current (IN) must be ad-justed relative to the phase current.
• When the secondary ground current corresponds to the residual current of three wye-connected current transformers (Appendix Section A.3, Figure A-6 or A-11), Address is set to .
• When the ground current is obtained from an independent neutral current trans-former (Appendix Section A.3, Figure A-8), address is then set equal to the ratio of the neutral current transformer ratio to the phase current transformer ratio.
Vsec-input Vprim-φφ
Address corresponds to the factor by which the sensitive ground current (INs) must be adjusted relative to the phase current.
• In models with sensitive ground current detection where an independent current transformer is used to supply INs (Appendix Section A3, Figures A-9 and A-10), ad-dress is set equal to the ratio of the neutral current transformer ratio to the phase current transformer ratio.
Example:
Phase current transformer 500 A/5 A Neutral current transformer 60 A/1 A Adaptation for sensitive ground current detection:
Phase Rotation Address 3+$6(6(4 is used to establish phase rotation. The default phase sequence is “abc”. For systems that use a phase sequence of “acb”, address
should be set accordingly. A temporary reversal of rotation is also possible using bi-nary inputs (see Section 6.16).
Trip and Close Command Duration
Address 7PLQ75,3&0' is used to set the minimum time the tripping contacts will remain closed. This setting applies to all protective functions that initiate tripping.
Address 7PD[&/26(&0' is used to set the maximum time the closing con-tacts will remain closed. This setting applies to the integrated reclosing function and must be long enough to allow the circuit breaker contacts to reliably engage. An ex-cessive duration causes no problem since the closing command is interrupted in the event another trip is initiated by a protective function.
Current Flow Moni-toring
Address %NU&ORVHG,0,1 corresponds to the threshold value of the integrat-ed current flow monitoring system. This setting is usintegrat-ed by several protective functions (e.g., voltage protection with current supervision, breaker failure protection, overload protection, and restart block for motors). If the threshold value set at address is exceeded, the circuit breaker is considered closed.
The threshold value setting applies to all three phases, and takes precedence over all other protective functions.
With regard to breaker failure protection, the threshold value must be set at a level be-low the minimum fault current for which breaker failure protection must operate. On the other hand, the current threshold should not be set more sensitive than necessary to avoid extended resetting times on transient phenomena of the current transformers after interruption of high short–circuit currents. A setting of 10% below the minimum fault current for which breaker failure protection must operate is recommended.
When using the device for motor protection, overload protection, and restart blocking;
the protective relay can distinguish between a running motor and a stopped motor, as well as take into account the varying motor cool-down behavior. Under this application, the set value must be lower than the minimum no-load current of the motor.
Address 0207 300 5⁄ 500 5⁄
Voltage Connection Address 97&RQQHFWLRQ specifies how the voltage transformers are connect-ed. When the voltage transformers are connected in a wye configuration, address
is set at 9DQ, 9EF, 9FQ. When the voltage transformers are connected as shown in Figure A-12 of Appendix Section A.3, address should be set at 9DE, 9EF, 9*QG. The latter setting is also selected when only two phase-to-phase voltage transformers are utilized or when only the displaced voltage (zero sequence voltage) is connected to the device.
Nominal Frequency Address 5DWHG)UHTXHQF\ corresponds to the frequency at which the protect-ed equipment operate. The setting is dependent on the model number of the relay pur-chased, and must be in accordance with the nominal frequency of the power system.
Units of Length Address 'LVWDQFH8QLW corresponds to the units of length (km or miles) ap-plicable to fault locating. If a fault locator is not included with the device, or if the fault locating function is disabled, this setting has no effect on operation of the device.
Changing the length unit will not result in an automatic conversion between the sys-tems. Such conversions must be entered at the appropriate addresses.
6.1.1.1 Settings
In the list below, the setting ranges and default setting values for the pickup currents are for a device with a nominal current rating IN = 5 A. For a nominal current rating IN
= 1 A, divide the Setting Options values and Default Setting values by 5. Consider the current transformer ratios when setting the device with primary values.
Addr. Setting Setting Options Default Setting Comment
201 CT Starpoint towards Line towards Busbar
towards Line Location of CT starpoint
202 Vnom PRIMARY 0.10 ~ 400.00 kV 12.00 kV Primary Voltage
203 Vnom SECONDARY 100 ~ 125 V 120 V Secondary Voltage
204 CT PRIMARY 10 ~ 50000 A 100 A CT Rated Primary Current
205 CT SECONDARY 1 A 5 A
5 A1) CT Rated Secondary Current
206 Vph / Vdelta 1.00 ~ 3.00 1.73 Phase to open delta voltage
conver-sion factor
207 CT N / CT Ph 0.010 ~ 1.000 1.000 Neutral CT to Phase CT conversion factor
208 CT Ns / CT Ph 0.001 ~ 1.000 1.000 Neutral INs CT to Phase CT conver-sion factor
209 PHASE SEQ. A B C
A C B
A B C Phase sequence
210 TMin TRIP CMD 0.01 ~ 32.00 s 0.15 s Minimum Trip Command Duration
1) depending of the ordering code, please refer to Table 6-1
6.1.1.2 Information
6.1.2 Setting Groups
Purpose of Setting Groups
A setting group is nothing more than a collection of setting values to be used for a par-ticular application. In the 7SJ62 relay, four independent setting groups (A ~ D) are pos-sible. The user can switch back and fourth between setting groups locally, via binary inputs (if so configured), via the operator or service interface using a personal comput-er, or via the system interface.
A setting group includes the setting values for all functions that have been selected as (QDEOHG during configuration (see Chapter 5). While setting values may vary among the four setting groups, the selected functions of each setting group remain the same.
Multiple setting groups allows a specific relay to be used for more than one application.
While all setting groups are stored in the relay, only one setting group may be active at a given time.
If multiple setting groups are not required, Group A is the default selection, and the following paragraph is not applicable.
If multiple setting groups are desired, address *US&KJH237,21 must be set to (QDEOHG in the relay configuration. Refer to chapter 5.
Copying Setting Groups
In most cases, only a few settings will vary from setting group to setting group. For this reason, an option exists to copy stored setting values from one setting group to anoth-er setting group using DIGSI®4:
To copy the setting values from setting group to another setting group, the user should highlight the setting group in the list whose setting values are to be copied. Next, the user should go to the menu bar, click on(GLW and select &RS\ (see Figure 6-9).
213 VT Connection Van, Vbn, Vcn Vab, Vbc, VGnd
Van, Vbn, Vcn Transformer connection
214 Rated Frequency 50 Hz 60 Hz
60 Hz1) Nominal frequency
215 Distance Unit Kilometers Miles
Miles1) Distance units for fault location
Addr. Setting Setting Options Default Setting Comment
F# LCD-Text Comment
5145 >Reverse Rot. Activation of Reverse Rotating Field Processing
5147 Rotation ABC Rotating Field ABC
5148 Rotation ACB Rotating Field ACB
Figure 6-9 Copying a Setting Group inDIGSI®4
The next step is to highlight the name of setting group in the list into which the setting values should be copied. The user should go to the menu bar, click on (GLW and select 3DVWH. A confirmation box will appear (see Figure 6-10). Select <HV to copy the set-ting values.
Figure 6-10 DIGSI®4: Confirmation before Copying a Setting Group
Setting groups may be copied more easily using the “Drag & Drop” feature. To use the
“Drag & Drop” feature, the name of the setting group in the list whose setting values Note:
All existing setting values in the setting group that has been copied to will be overwrit-ten. An inadvertent copy operation can be reversed by closing and reopening the DIGSI®4 session without saving changes.
After copying setting groups, it is only necessary to modify those setting values that are to be set differently.
Restoring Factory Settings
The factory settings may be restored for a modified setting group. To restore factory settings to a setting group, the name of the setting group whose settings are to be re-stored should be highlighted. Next, the user should select the menu option (GLW and then click on 5HVHW. A confirmation box appears, and the user should click on <HV to confirm restoration of factory settings.
Switching between Setting Groups
The procedure to switch from one setting group to another during operations is de-scribed in Sub-section 7.2.2. The option of switching between several setting groups externally via binary inputs is described in Subsection 8.1.2.
6.1.2.1 Information