8.3.1 Display When Tripping
If there is any protection element operating, a brief tripping report will appear on the LCD, and the backlight of the LCD and the LED “TRIP” will be on simultaneously.
The format of the fault report is shown as below.
Figure 8.3-1 LCD display of trip report
The first line shows the report title and the sequence number of the history trip report, and the second line shows the operation time of the history trip report. Other lines show the protection elements and fault information one by one according to the relative time sequence. The fault information includes fault phase, maximum fault value and minimum fault value.
NOTE! In case more than one protection element has operated, the relevant report will be displayed alternatively one by one according to time sequence on the LCD. And the fault information is listed after all the protection elements.
The trip report will keep being displayed on LCD until an acknowledgement is received by pressing the key “ENT”+“ESC”, by energizing the binary input [BI_RstTarg] or by executing the submenu “Reset Target”. The default display then appears on LCD and LED “TRIP” is turned off.
Protection elements listed below may be displayed.
No. Protection Element Description
1 FD.Pkp The fault detector operates.
2 Op_Prot Anyone of the protective elements in this relay operates. 3 50/51P1.Op The stage 1 overcurrent protection operates.
4 50/51P2.Op The stage 2 overcurrent protection operates. 5 50/51P3.Op The stage 3 overcurrent protection operates. 6 50/51P4.Op The stage 4 overcurrent protection operates.
7 50/51G1.Op The No.1 stage 1 zero sequence overcurrent protection operates. 8 50/51G2.Op The No.1 stage 2 zero sequence overcurrent protection operates. 9 50/51G3.Op The No.1 stage 3 zero sequence overcurrent protection operates. 10 50/51G4.Op The No.1 stage 4 zero sequence overcurrent protection operates. 11 A.50/51G1.Op The No.2 stage 1 zero sequence overcurrent protection operates.
12 A.50/51G2.Op The No.2 stage 2 zero sequence overcurrent protection operates. 13 A.50/51G3.Op The No.2 stage 3 zero sequence overcurrent protection operates. 14 A.50/51G4.Op The No.2 stage 4 zero sequence overcurrent protection operates. 15 50/51Q1.Op The stage 1 negative sequence overcurrent protection operates. 16 50/51Q2.Op The stage 2 negative sequence overcurrent protection operates. 17 50/51SEF1.Op The stage 1 sensitive earth fault protection operates.
18 50/51SEF2.Op The stage 2 sensitive earth fault protection operates. 19 50/51SEF3.Op The stage 3 sensitive earth fault protection operates. 20 50/51SEF4.Op The stage 4 sensitive earth fault protection operates. 21 50PSOTF.Op The SOTF overcurrent protection operates.
22 50GSOTF.Op The zero sequence SOTF overcurrent protection operates. 23 50BC.Op The broken conductor protection operates.
24 49.Op The thermal overload protection operates. 25 50BF.Op The breaker failure protection operates. 26 50BF.ReTrp The breaker failure protection re-trip operates. 27 27P1.Op The stage 1 undervoltage protection operates. 28 27P2.Op The stage 2 undervoltage protection operates. 29 59P1.Op The stage 1 overvoltage protection operates. 30 59P2.Op The stage 2 overvoltage protection operates.
31 59Q.Op The negative sequence overvoltage protection operates. 32 59G1.Op The stage 1 zero sequence overvoltage protection operates. 33 59G2.Op The stage 2 zero sequence overvoltage protection operates. 34 81U1.Op The stage 1 under-frequency protection operates.
35 81U2.Op The stage 2 under-frequency protection operates. 36 81U3.Op The stage 3 under-frequency protection operates. 37 81U4.Op The stage 4 under-frequency protection operates. 38 81O1.Op The stage 1 over-frequency protection operates. 39 81O2.Op The stage 2 over-frequency protection operates. 40 81O3.Op The stage 3 over-frequency protection operates. 41 81O4.Op The stage 4 over-frequency protection operates.
42 81R1.Op The stage 1 frequency rate-of-change protection operates. 43 81R2.Op The stage 2 frequency rate-of-change protection operates. 44 81R3.Op The stage 3 frequency rate-of-change protection operates. 45 81R4.Op The stage 4 frequency rate-of-change protection operates. 46 79.Close_3PS1 The 1st shot auto-recloser operates.
47 79.Close_3PS2 The 2nd shot auto-recloser operates.
48 79.Close_3PS3 The 3rd shot auto-recloser operates.
49 79.Close_3PS4 The 4th shot auto-recloser operates.
50 MR1.Op The No.1 mechanical protection operates. 51 MR2.Op The No.2 mechanical protection operates. 52 MR3.Op The No.3 mechanical protection operates. 53 MR4.Op The No.4 mechanical protection operates. 54 50/51P1.St The stage 1 overcurrent protection picks up.
55 50/51P2.St The stage 2 overcurrent protection picks up. 56 50/51P3.St The stage 3 overcurrent protection picks up. 57 50/51P4.St The stage 4 overcurrent protection picks up.
58 50/51G1.St The No.1 stage 1 zero sequence overcurrent protection picks up. 59 50/51G2.St The No.1 stage 2 zero sequence overcurrent protection picks up. 60 50/51G3.St The No.1 stage 3 zero sequence overcurrent protection picks up. 61 50/51G4.St The No.1 stage 4 zero sequence overcurrent protection picks up. 62 A.50/51G1.St The No.2 stage 1 zero sequence overcurrent protection picks up. 63 A.50/51G2.St The No.2 stage 2 zero sequence overcurrent protection picks up. 64 A.50/51G3.St The No.2 stage 3 zero sequence overcurrent protection picks up. 65 A.50/51G4.St The No.2 stage 4 zero sequence overcurrent protection picks up. 66 50/51Q1.St The stage 1 negative sequence overcurrent protection picks up. 67 50/51Q2.St The stage 2 negative sequence overcurrent protection picks up. 68 50/51SEF1.St The stage 1 sensitive earth fault protection picks up.
69 50/51SEF2.St The stage 2 sensitive earth fault protection picks up. 70 50/51SEF3.St The stage 3 sensitive earth fault protection picks up. 71 50/51SEF4.St The stage 4 sensitive earth fault protection picks up. 72 50PSOTF.St The SOTF overcurrent protection picks up.
73 50GSOTF.St The zero sequence SOTF overcurrent protection picks up. 74 50BC.St The broken conductor protection picks up.
75 49.St The thermal overload protection picks up. 76 50BF.St The breaker failure protection picks up. 77 27P1.St The stage 1 undervoltage protection picks up. 78 27P2.St The stage 2 undervoltage protection picks up. 79 59P1.St The stage 1 overvoltage protection picks up. 80 59P2.St The stage 2 overvoltage protection picks up.
81 59Q.St The negative sequence overvoltage protection picks up. 82 59G1.St The stage 1 zero sequence overvoltage protection picks up. 83 59G2.St The stage 2 zero sequence overvoltage protection picks up. 84 81U1.St The stage 1 under-frequency protection picks up.
85 81U2.St The stage 2 under-frequency protection picks up. 86 81U3.St The stage 3 under-frequency protection picks up. 87 81U4.St The stage 4 under-frequency protection picks up. 88 81O1.St The stage 1 over-frequency protection picks up. 89 81O2.St The stage 2 over-frequency protection picks up. 90 81O3.St The stage 3 over-frequency protection picks up. 91 81O4.St The stage 4 over-frequency protection picks up.
92 81R1.St The stage 1 frequency rate-of-change protection picks up. 93 81R2.St The stage 2 frequency rate-of-change protection picks up. 94 81R3.St The stage 3 frequency rate-of-change protection picks up. 95 81R4.St The stage 4 frequency rate-of-change protection picks up. 96 79.InProg The auto-recloser picks up.
98 MR2.St The No.2 mechanical protection picks up. 99 MR3.St The No.3 mechanical protection picks up. 100 MR4.St The No.4 mechanical protection picks up. Fault information listed below may be displayed.
No. Fault Information Description
1 Ip_Max The maximum phase current
2 3I0Cal_Max The maximum self-calculated zero sequence current 3 3I0Ext1_Max The No.1 maximum external zero sequence current 4 3I0Ext2_Max The No.2 maximum external zero sequence current 5 3I0SEF_Max The maximum sensitive earth fault current
6 I2/I1_Max The maximum ratio of I2/I1
7 Upp_Min The minimum phase-to-phase voltage 8 Upp_Max The maximum phase-to-phase voltage
9 Up_Min The minimum phase voltage
10 Up_Max The maximum phase voltage
11 U2_Max The maximum negative sequence voltage 12 Ux_Max The maximum synchro-check voltage 13 Ux_Min The minimum synchro-check voltage 14 f_Max The maximum system frequency 15 f_Min The minimum system frequency
See Chapter 3 for more details about the protection operation theory.
8.3.2 Display under Abnormal Condition
8.3.2.1 Alarm Information on LCD
If there is any abnormality in the operation or any firmware error is detected by the self-diagnostics of this relay, an alarm report will be displayed instantaneously on the LCD. Therefore, the default display will be replaced by the alarm report. The format of the alarm report is shown as below.
Figure 8.3-2 Information of alarm report on the LCD
The first line shows the alarm report title, and then shows the alarm elements one by one according to the time sequence.
The alarm report will keep being displayed on LCD until the relevant alarm situation is restored to normal state. It means that this relay does not detect any alarm situation. The default display then
appears on LCD and LED “ALARM” is off. The LED “ALARM” will not be on if either of the alarm signals [Fail_Device] and [Fail_Setting] is issued.
Alarm elements listed below may be displayed. See Section 4.2 for more details about the alarm element operation theory.
No. Alarm Element Description HEALTHY ALARM
1 Fail_Device A serious fault is detected to block this device. Off × 2 Fail_BoardConfig The module configuration of this device is wrong. Off × 3 Fail_Setting Anyone of the settings is modified. Off × 4 Fail_Setting_OvRange Anyone of the settings is out of range. Off × 5 Fail_SettingItem_Chgd Anyone of the setting items is changed. Off × 6 Alm_Device Anyone of the software supervision alarm occurs. × On 7 Alm_Setting_MON The settings from the HMI module are not correct. × On 8 Alm_Version The current program version is not correct. × On 9 Alm_BI_SettingGrp The group number is changed by the binary inputs × On 10 Alm_52b The normal close contact of the CB is abnormal. × On 11 VTS.Alm_SynVT The synchro-check VT circuit is failed. × On 12 VTS.Alm The protection voltage transformer circuit is failed. × On
13 CTS.Alm The current transformer is failed. × On
14 49.Alm The thermal overload situation is occurred. × On 15 Alm_CommTest The communication test operation is executed. × On 16 Alm_TimeSync The time synchronization is not correct. × On 17 Alm_Maintenance The device is in maintenance situation. × On 18 Alm_LowPres_Trp The pressure of the tripping circuit is low. × On 19 Alm_LowPres_Cls The pressure of the closing circuit is low. × On 20 Alm_ResvX The No.X reserved alarm signal is issued. × On Here, “On” means the LED is on, “Off” means the LED is off, and “×” means having no influence.
NOTE! When this relay is energized, in the startup process, the LED “HEALTHY” is off and the LED “ALARM” is on.
The handling suggestions of the alarm events are listed as below.
No. Alarm Element Handing Suggestion
1 Fail_Device Please check whether there has a serious error in this relay.
2 Fail_BoardConfig Please check whether the board configuration complies with the software. 3 Fail_Setting Please ensure whether anyone of the settings is modified.
4 Fail_Setting_OvRange Please ensure whether anyone of the settings is out of range. 5 Fail_SettingItem_Chgd Please enter the relevant setting menu of this relay to confirm it.
6 Alm_Device Please ensure whether anyone of the software supervision alarm occurs. 7 Alm_Setting_MON Please inform the manufacturer to deal with it.
8 Alm_Version Please inform the manufacturer to deal with it.
10 Alm_52b Please check the auxiliary open position contact of the circuit breaker. 11 VTS.Alm_SynVT Please check the secondary circuit of the synchro-check voltage transformer. 12 VTS.Alm Please check the secondary circuit of the protection voltage transformer. 13 CTS.Alm Please check the secondary circuit of the current transformer.
14 49.Alm Please check whether the thermal overload condition is satisfied. 15 Alm_CommTest Please check whether this device is in communication test situation. 16 Alm_TimeSync Please check whether the time synchronization signal is correct.
17 Alm_Maintenance Please check whether the binary input for denoting maintenance is energized. 18 Alm_LowPres_Trp Please check the mechanism of the circuit breaker.
19 Alm_LowPres_Cls Please check the mechanism of the circuit breaker.
20 Alm_ResvX Please check whether the relevant alarm issuing conditions are satisfied. 8.3.2.2 Understand the Alarms
Hardware circuit and operation condition of this device are self-supervised continuously. If any abnormal condition is detected, information or report will be displayed and a corresponding alarm will be issued.
A common abnormality may block a certain number of protection functions while other functions can still work.
However, if a serious hardware failure or abnormality is detected, all protection functions will be blocked and the LED “HEALTHY” will be off.
When hardware failure is detected, all protection functions will be blocked and the corresponding alarm signal will be issued. This relay can not work normally in such a situation and a manual maintenance is required to fix the failure.
NOTE! If this device is blocked or alarm signal is issued during operation, do please find out its reason by help of the history reports. If the reason can not be found on site, please inform the manufacturer NR Electric Co., Ltd.