5. OVERCURRENT RELEASE (OCR)

Transcription

1 5. OVERCURRENT RELEASE (OCR) Options available for the type AR ACBs include a highly reliable, multi-functional overcurrent release (OCR) with a built-in 8- bit microprocessor. This OCR is supplied with power through a CT and main circuit current signals from current sensors. When the OCR detects a fault, it sends a trip signal to the tripping coil (TC) or provides a trip indication or an alarm depending on the type of the fault. The OCR uses the root mean square sensing for the long time delay (LTD), N-phase protection (NP), and pretrip alarm (PTA) functions. (When six times the CT rated primary current is exceeded, the peak value sensing is used instead.) If a harmonic current flows through the ACB continuously, the root mean square sensing allows the ACB to operate normally. The OCR is available in the three types that follows: AGR-22L L characteristic for general feeder (for works and transformer protection) AGR-22R R characteristic for general feeder (3 characteristics conforming to IEC60255) AGR-22S S characteristic for generator protection 5-1. Specifications Specifications of the OCR are shown in Table 17 and Fig. 27. Table 17 Specifications of type AGR-22 OCR (: Standard, : Optional, : Not applicable) Application For general feeder For generator protection Characteristic L R S Type designation AGR-22L-XXX AGR-22R-XXX AGR-22S- XXX Suffix (XXX) of type designation PS PG PGU PS PG PGU PS PSU Long time delay trip (LT) Short time delay trip (ST) Protective function Instantaneous trip (INST/MCR) Ground fault trip (GF) *1 N-phase protection *2 Pretrip alarm (PTA) *2 Reference section Adjustable undervoltage trip (UVT) COLD/HOT (LT) * I 2 t ON/OFF (ST) 5-3. Protection INST/MCR (INST) * characteristic I 2 t ON/OFF (GF) 5-3. Trip indication Ground fault trip/alarm 5-3. Group indication LED and contact output Individual indication LEDs and contact output Tripped indication *5 *5 * Spring charged indication Contact temperature alarm indication Test function 5-5. Control power supply Required Required Required Required Required Required Required Required 3-3. *1: Control power supply is required when the CT rated primary current [I CT ] is not more than 800A and the ground fault trip pickup current setting [I G ] is 10% of I CT. *2: Disabled when control power is lost. *3: The long time delay trip and N-phase protection functions can be set to COLD or HOT mode by using a button. In HOT mode, the OCR trips open the ACB in shorter time than in COLD mode when an overload occurs. The HOT mode will be suitable for protection of heat sensitive loads. The OCR is factory set to COLD mode. To select HOT, change the mode from COLD to HOT. If the control power is lost, load data stored in HOT mode is cleared. Fig. 27 shows the operating time in COLD and HOT modes. *4: When INST is enabled, the OCR trips open the ACB when the trip pickup current is reached or exceeded, irrespective of the ACB status. When MCR is enabled, the OCR trips open the ACB when the ACB making current setting is reached or exceeded, and after tripping operation, it locks the ACB in the open state. When using the MCR function, control power supply is required. MCR provides the INST function if the control power is lost. *5: Available as an option instead of UVT operation indication COLD mode 2 HOT mode: When an overload occurs in a 50%-load state, the operating time is approx. 80% of the time required in COLD mode. 3 HOT mode: When an overload occurs in a 75%-load state, the operating time is approx. 60% of the time required in COLD mode. 4 HOT mode: When an overload occurs in a 100%-load state, the operating time is approx. 20% of the time required in COLD mode. Fig. 27 COLD and HOT mode 27 KRB-5249

2 5-2. Display Navigation and Characteristic Setting Procedures CAUTION OCR setting changes must be performed by competent persons. The following describes how to navigate through displayed items on the LCD and set the OCR characteristic. 1) Push the right end of the OCR cover to the left at the recess on the front cover to unlatch and open the OCR cover. See Fig. 28. If the OCR cover is padlocked, first remove the padlock. OCR cover Recess Front cover Fig. 28 OCR cover 2) Use the MODE (-), SELECE (+), ENT, ESC and RE buttons to navigate displayed items on the LCD and set the OCR characteristic. Fig. 29 shows the front view of the OCR. The service life of the LCD is generally assumed to end when the contrast decreases by 50%, and is rated at approx. 5.7 years at an ambient temperature of 25 C and a relative humidity of 55%. If the contrast decreases so that LCD indications are hard to view, replace the OCR unit. For the replacement of the OCR, contact us. RE button LCD* SELECT(+) button MODE(-) button CT rated primary current Factory-set rated current U C : UVT rated supply voltage ENT button ESC button Fig. 29 OCR front view (type AGR-22L-PGU) REMOTE/LOCAL selector switch REMOTE: This position allows ON-OFF operation from a remote site. When this position is selected, the switches connected to control terminals 12, 03, 13 and 23 (Fig. 10) are inoperative LOCAL: This position allows ON-OFF operation via the switches connected to control terminals 12, 03, 13 and 23 (Fig. 10). When this position is selected, remote ON-OFF operation is not allowed. * The ON/OFF buttons on the ACB can always be used for ON- OFF operation, irrespective of the position of this selector switch. KRB

3 3) The LCD navigation procedure is as shown in Fig. 30 below. Monitor mode MONI MODE Phase current R phase, actual *3 I A Initial display *1 Set mode MODE R phase, max *3 MAX I A Test mode TEST MODE Numbers 1-5 represent the buttons on the OCR front panel. *1: The LCD returns to the initial display if no button is pressed for 30 seconds. *2: Holding button 5 down for approx. 5 seconds resets the watt-hour value to "0". *3: Holding button 5 down deletes all the max. values of R/S/T phase current and ground fault current. *4: Holding button 5 down deletes all the max. values of R-S/S-T/T-R voltage and reactive power. *5: "Lag" and "Lead" relate to the phase. Active power ACTIVE POWER S phase, actual *3 I A S phase, max *3 MAX I A T phase, actual *3 I A T phase, max *3 MAX I A GF, actual *3 IG 0 A GF, max *3 MAX IG 210 A Actual *4 ACTIVE POWER 960 kw Watt-hour *2 ENERGY WATT-HOUR 5760 MWh Max *4 ACTIVE POWER MAX 1340 kw Buttons on the OCR front panel LCD RE Line voltage LINE VOLTAGE Power factor *5 COS Lag 0.90 R-S, actual *4 LINE VOLTAGE V V R-S, max *4 LINE VOLTAGE MAX V V MODE (-) SELECT (+) ENT ESC S-T, actual *4 LINE VOLTAGE V V S-T, max *4 LINE VOLTAGE MAX V V T-R, actual *4 LINE VOLTAGE V V T-R, max *4 LINE VOLTAGE MAX V V Reactive power REACTIVE POWER Frequency FREQUENCY MAX 60.0Hz Actual *4 REACTIVE POWER 960 kvar Max *4 REACTIVE POWER MAX 1340 kvar Fig. 30 LCD navigation 29 KRB-5249

4 4) Before changing OCR settings, open the ACB and then draw the ACB body to the TEST position or lock the OFF button to prevent the ACB from being closed inadvertently. 5) The OCR setting procedure is as shown in Figs. 31 and 32 below. Monitor mode MONI MODE Phase current R phase, actual I A Initial display *1 Set mode MODE Test mode TEST MODE Numbers 1 5 represent the buttons on the OCR front panel. *1: The LCD returns to the initial display if no button is pressed for 30 seconds. *2: Cannot be changed for S characteristic. *3: Use button 1 or 2 to change the setting. The shaded digit shows the position of the cursor blinking. *4: No display means that COLD is selected. *5: No display means that I 2 t is off. *6: Appears only for R characteristic. MODE (-) Buttons on the OCR front panel SELECT (+) LCD ENT RE ESC Rated current RATED CUR Rated current *2 ICT 1600A In 1600A Long time delay trip Current setting LT IR 1.0 In TR 10.0sec Time setting IR 1.0 In TR 10.0sec HOT / COLD *4 IR 1.0 In TR 10.0sec Characteristic selection *6 IR 1.0 In R1 TR 5.0sec, *3 ICT 1600A In 1250A IR 0.95 In TR 10.0sec IR 1.0 In TR 5.0sec IR 1.0 In HOT TR 10.0sec IR 1.0 In R2 TR 5.0sec Short time delay trip Current setting ST Isd 6.0 In Tsd 0.40sec Time setting Isd 6.0 In Tsd 0.40sec I 2 t characteristic *5 Isd 6.0 In Tsd 0.40sec Instantaneous trip Current setting INST/MCR Ii 16.0 In INST Undervoltage trip UVT Fig. 32 INST / MCR Ii 16.0 In INST Isd 4.0 In Tsd 0.40sec Isd 6.0 In Tsd 0.20sec Isd 6.0 In ON Tsd 0.40sec Ii 14.0 In INST Ii 16.0 In MCR Fig. 31 OCR setting change (LT/ST/INST) KRB

5 Monitor mode MONI MODE Phase current R phase, actual I A Initial display *1 Set mode MODE Test mode TEST MODE Rated current RATED CUR Fig. 31 Numbers 1 5 represent the buttons on the OCR front panel. *1: The LCD returns to the initial display if no button is pressed for 30 seconds. *2: Use button 1 or 2 to change the setting. The shaded digit shows the position of the cursor blinking. *3: If "Ig TING 1200A OVER" is displayed, press button 4 twice to return to the setting change screen and then decrease the setting to not more than 1200A. *4: No display means that I 2 t is off. MODE (-) Buttons on the OCR front panel SELECT (+) LCD ENT RE ESC Ground fault 1 GF1 Ground fault 2 GF2 Pretrip alarm PRE TRIP N-phase protection LT (N) Polarity POWER Current setting Ig 0.20 ICT Tg 0.30sec Time setting Ig 0.20 ICT Tg 0.30sec I 2 t characteristic *4 Ig 0.20 ICT Tg 0.30sec Trip / Alarm GF2 TRIP Current setting Ip In Tp1 120sec Time setting Ip In Tp1 120sec Current setting IN 0.40 ICT TN 10.0sec Line side/load side NOR Ig 0.10 ICT Tg 0.30sec Ig 0.20 ICT Tg 0.20sec Ig 0.20 ICT ON Tg 0.30sec GF2 ALARM Ip In Tp1 120sec Ip In Tp1 80.0sec IN 0.50 ICT TN 10.0sec REV, *2 *3 UVT UVT Attraction voltage setting Up 0.85 Uc Tu 0.50sec Tripping time setting Up 0.85 Uc Tu 0.50sec Up 0.80 Uc Tu 0.50sec Up 0.85 Uc Tu 0.40sec Fig. 32 OCR setting change (GF/PTA/N-phase protection/polarity/uvt) 31 KRB-5249

6 5-3. Characteristic Setting L characteristic for general feeder Characteristic settings and characteristic curves of the type AGR-22L OCR (with L characteristic) are shown in Table 18 and Fig. 33 respectively. Table 18 Settings of type AGR-22L OCR (with L characteristic) No. Setting item Symbol Setting range - Rated current *1 I n Rated current [I n ] CT rated primary current [I CT ] ( ) (A) Applied [I CT ] (A) [I CT ] [I CT ] [I CT ] (A) [I CT ] [I 2 Long time delay trip pickup current (continuous) I n ] ( NON) (A) R Non tripping at not more than [I R ] x 1.05, Tripping at more than [I R ] 1.05 and not more than [I R ] Long time delay trip timing t R ( ) (sec) at 600% of [I R ], Tolerance: ±15%, +0.15s 0s - Long time delay trip mode - HOT/COLD 6 Short time delay trip pickup current I sd [I n ] ( NON) (A), Tolerance: ±15% t sd Relaying time (ms.) Short time delay trip timing Resettable time (ms.) Max. total clearing time (ms.) Short time delay trip I 2 t mode I 2 t t sd ON/OFF 9 Instantaneous trip pickup current I i [I n ] ( NON) (A), Tolerance: 20% 10 INST/MCR - Selectable 11 Ground fault trip pickup current *2 I g [I CT ] ( NON) (A), Tolerance: 20% t g Relaying time (ms.) Ground fault trip timing Resettable time (ms.) Max. total clearing time (ms.) Ground fault trip I 2 t mode I 2 t t g ON/OFF - Ground fault trip/alarm - TRIP/ALARM 14 Pretrip alarm pickup current I P1 [I n ] ( ) (A), Tolerance: ±7.5% 15 Pretrip alarm timing t P1 ( ) (sec) at not less than [I P1 ], Tolerance: ±15%, +0.1s 0 N-phase protection trip pickup current [I 3 I CT ] ( ) (continuous) N Non tripping at not more than [I N ] 1.05, Tripping at more than [I N ] x 1.05 and not more than [I R ] N-phase protection trip timing T N Depends on long time delay trip timing [t R ] - N-phase protection trip mode - Depends on long time delay trip mode (HOT/COLD) - Polarity - NOR/REV - UVT attraction voltage - [U C ] x ( ) (V), Tolerance: 5% ACB closing operation enabled 2 seconds after the above voltage or more is reached - UVT trip timing - ( ) sec (+0.15/ sec) at not more than [U C ] x 0.65 (V) 5% Underlined values are default settings. NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are set to NON, however, the fail-safe operates so that: When the short time delay and instantaneous trip pickup current values are set to NON, the OCR automatically changes the instantaneous trip pickup current to [I n ] x 16. When the short time delay and MCR current values are set to NON, the OCR automatically changes the short time delay trip pickup current to [I n ] x 10. A pickup current means the threshold by which the OCR determines whether or not an overcurrent occurs. When the current flowing through the OCR exceeds the pickup current setting provided that [I R ] x 1.05 < pickup current setting [I R ] 1.2, the OCR starts counting the time for tripping. Once the current flowing through the OCR reduces to less than the pickup current setting, time count is reset. *1: A change in rated current setting results in changes in long time delay, short time delay, instantaneous, and pretrip alarm pickup current settings accordingly. *2: The ground fault trip pickup current setting should not exceed 1200A. KRB

7 Long time delay trip Short time delay trip, instantaneous trip and pretrip alarm Note 1: The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by t = t R ln (1.125 I R ) 2 1- i % 0.15 [sec] I R = Long time delay (or N-phase protection) trip pickup current setting i = Overcurrent t R = Time setting Note 2: The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. N-phase protection trip and ground fault trip Fig. 33 Characteristic curves of type AGR-22L OCR (with L characteristic) 33 KRB-5249

8 R characteristic for general feeder Characteristic settings and characteristic curves of the type AGR-22R OCR (with R characteristic) are shown in Table 19 and Figs respectively. Table 19 Settings of type AGR-22R OCR (with R characteristic) No. Setting item Symbol Setting range CT rated primary current [I CT ] ( ) (A) Applied [I CT ] (A) [I CT ] Rated current *1 I Rated n current [I CT ] [I n ] [I CT ] (A) [I CT ] [I 2 Long time delay trip pickup current (continuous) I n ] ( NON) (A) R Non tripping at not more than [I R ] x 1.05, Tripping at more than [I R ] 1.05 and not more than [I R ] Long time delay trip timing t R ( ) (sec) at 300% of [I R ], Tolerance: ±20%, +0.15s 0s - Long time delay trip characteristic - "R1": I 0.02 t, "R2": It, "R3": I 2 t, "R4": I 3 t, "R5": I 4 t 6 Short time delay trip pickup current I sd [I n ] ( NON) (A), Tolerance: ±15% t sd Relaying time (ms.) Short time delay trip timing Resettable time (ms.) Max. total clearing time (ms.) Short time delay trip I 2 t mode I 2 t t sd ON/OFF 9 Instantaneous trip pickup current I i [I n ] ( NON) (A), Tolerance: 20% 10 INST/MCR - Selectable 11 Ground fault trip pickup current *2 I g [I CT ] ( NON) (A), Tolerance: 20% t g Relaying time (ms.) Ground fault trip timing Resettable time (ms.) Max. total clearing time (ms.) Ground fault trip I 2 t mode I 2 t t g ON/OFF - Ground fault trip/alarm - TRIP/ALARM 14 Pretrip alarm pickup current I P1 [I n ] ( ) (A), Tolerance: ±7.5% 15 Pretrip alarm timing t P1 ( ) (sec) at not less than [I P1 ], Tolerance: ±15%, +0.1s 0 N-phase protection trip pickup current [I 3 I CT ] ( ) (continuous) N Non tripping at not more than [I N ] 1.05, Tripping at more than [I N ] x 1.05 and not more than [I R ] N-phase protection trip timing T N Depends on long time delay trip timing [t R ] - Polarity - NOR/REV - UVT attraction voltage - [U C ] x ( ) (V), Tolerance: 5% ACB closing operation enabled 2 seconds after the above voltage or more is reached - UVT trip timing - ( ) sec (+0.15/ sec) at not more than [U C ] x 0.65 (V) 5% Underlined values are default settings. NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are set to NON, however, the fail-safe operates so that: When the short time delay and instantaneous trip pickup current values are set to NON, the OCR automatically changes the instantaneous trip pickup current to [I n ] x 16. When the short time delay and MCR current values are set to NON, the OCR automatically changes the short time delay trip pickup current to [I n ] x 10. A pickup current means the threshold by which the OCR determines whether or not an overcurrent occurs. When the current flowing through the OCR exceeds the pickup current setting provided that [I R ] x 1.05 < pickup current setting [I R ] 1.2, the OCR starts counting the time for tripping. Once the current flowing through the OCR reduces to less than the pickup current setting, time count is reset. *1: A change in rated current setting results in changes in long time delay, short time delay, instantaneous, and pretrip alarm pickup current settings accordingly. *2: The ground fault trip pickup current setting should not exceed 1200A. KRB

9 Long time delay trip Short time delay trip, instantaneous trip and pretrip alarm Note 1: The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by Type of protection characteristic: It t i t R IR 20% 0.15 [sec] -0 Type of protection characteristic: I 4 t t t R 1.125I R i % 0.15 [sec] -0 I R = Long time delay (or N-phase protection) trip pickup current setting i = Overcurrent t R = Time setting N-phase protection trip and ground fault trip Note 2: The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. Fig. 34 Characteristic curves of type AGR-22R OCR (with R characteristic of I 0.02 t and I 3 t protection types) 35 KRB-5249

10 Long time delay trip Short time delay trip, instantaneous trip and pretrip alarm Note 1: The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by Type of protection characteristic: I 0.02 t i t t R 1.125IR -1 20% 0.15 [sec] -0 Type of protection characteristic: I 3 t i t t R 1.125IR % 0.15 [sec] -0 I R = Long time delay (or N-phase protection) trip pickup current setting i = Overcurrent t R = Time setting N-phase protection trip and ground fault trip Note 2: The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. Fig. 35 Characteristic curves of type AGR-22R OCR (with R characteristic of It and I 4 t protection types) KRB

11 Long time delay trip Short time delay trip, instantaneous trip and pretrip alarm Note 1: The operating time (t) at a long time delay (or N-phase protection) trip pickup current setting is given by i t t R 1.125IR % 0.15 [sec] -0 I R = Long time delay (or N-phase protection) trip pickup current setting i = Overcurrent t R = Time setting Note 2: The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. N-phase protection trip and ground fault trip Fig. 36 Characteristic curves of type AGR-22R OCR (with R characteristic of I 2 t protection type) 37 KRB-5249

12 S characteristic for generator protection Characteristic settings and characteristic curves of the type AGR-22S OCR (with S characteristic) are shown in Table 20, and Fig. 37 respectively. Table 20 Settings of type AGR-22S OCR (with S characteristic) No. Setting item Symbol Setting range - Rated current *1 I n CT rated primary current [I CT ] ( ) (A): Fixed to a single point 2 Long time delay trip pickup current (continuous) I R [I n ] ( NON) (A), Tolerance: ±5% 4 Long time delay trip timing t R ( ) (sec) at 120% of [I R ], Tolerance: ±15%, +0.1s 0 6 Short time delay trip pickup current I sd [I n ] ( NON) (A), Tolerance: ±10% t sd Relaying time (ms.) Short time delay trip timing Resettable time (ms.) Max. total clearing time (ms.) Short time delay trip I 2 t mode I 2 t t sd ON/OFF 9 Instantaneous trip pickup current I i [I n ] ( NON) (A), Tolerance: ±20% 10 INST/MCR - Selectable 14 Pretrip alarm pickup current I P1 [I n ] ( ) (A), Tolerance: ±5% 15 Pretrip alarm timing t P1 ( ) (sec) at 120% of [I P1 ], Tolerance: ±15%, +0.1s 0 - Polarity - NOR/REV - UVT attraction voltage - [U C ] x ( ) (V), Tolerance: 5% ACB closing operation enabled 2 seconds after the above voltage or more is reached - UVT trip timing - ( ) sec (+0.15/ sec) at not more than [U C ] x 0.65 (V) 5% Underlined values are default settings. NON setting disables protective functions. If the short time delay trip function and the instantaneous trip (or MCR) function are set to NON, however, the fail-safe operates so that: When the short time delay and instantaneous trip pickup current values are set to NON, the OCR automatically changes the instantaneous trip pickup current to [I n ] x 16. When the short time delay and MCR current values are set to NON, the OCR automatically changes the short time delay trip pickup current to [I n ] x 5. *1: Cannot be changed by the user. Long time delay trip, short time delay trip and instantaneous trip Note 1: The operating time (t) at a long time delay trip pickup current setting is given by t = t R ln 2 1- I R i 2 15% [sec] KRB Pretrip alarm I R = Long time delay trip pickup current setting i = Overcurrent t R = Time setting Note 2: The short time delay trip function has precedence over the long time delay trip function. The OCR operates at the short time delay trip timing even in those current ranges in which the long time delay trip time setting is shorter than the short time delay time setting. Fig. 37 Characteristic curves of type AGR-22S OCR (with S characteristic)

13 5-4. Operation Indication and Indication Resetting Procedure The OCR has LEDs on the front panel to provide operation indications as shown in Fig. 38 and Tables It also outputs operation signals to contacts. To reset LEDs, contact output and LCD display, press the reset button (Fig ) or isolate the control power (Fig , 11, 21 ) for at least 1 second. (Red) (Red) (Red) (Red) (Yellow) (Green/Red) (Red) (Red) Reset button Fig. 38 LEDs and reset button Table 21 Operation indication 1 Type of OCR AGR-22L-PS AGR-22L-PG AGR-22L-PGU AGR-22R-PS AGR-22R-PG AGR-22R-PGU AGR-22S-PS AGR-22S-PSU AGR-22L-PS AGR-22L-PG AGR-22L-PGU AGR-22R-PS AGR-22R-PG AGR-22R-PGU AGR-22S-PS AGR-22S-PSU AGR-22L-PG AGR-22L-PGU AGR-22R-PG AGR-22R-PGU AGR-22L-PGU AGR-22R-PGU AGR-22S-PSU Control power supply Required Operation Position LED State Normal Pickup Trip/Alarm Reset Terminal No. See Fig. 10 Long time delay trip (LT) 1 05, 15 N-phase protection (NP) Flash Short time delay trip (ST) 2 OFF ON OFF 05, 25 Instantaneous trip (INST/MCR) 3 - Long time delay trip (LT) 1 05, 15 Flash Required Short time delay trip (ST) 2 OFF ON OFF 05, 25 Instantaneous trip (INST/MCR) 3 - Required Contact output State Normal Trip/Alarm Reset OFF ON OFF OFF Turn OFF automatically after ON for 500 ms or more *5 Pretrip alarm (PTA) 6 Flash ON *4 OFF 05, 06 ON *4 OFF System alarm 4 OFF - ON OFF *3 05, 26 OFF OFF ON OFF *3 Required Ground fault trip (GF) 5 OFF Flash ON OFF 05, 16 OFF ON OFF Required Adjustable undervoltage trip (UVT) 7 Green LED ON Green LED Flash Red LED ON *1 Green LED ON *2 05, 17 *6 OFF ON OFF All Required Contact temperature alarm 8 OFF - ON OFF 05, 07 OFF ON OFF The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset. The operation indication is updated when a protective function is activated. *1: Turns OFF when the UVT is activated even though the ACB is open. When the UVT power is restored, the green LED turns ON automatically without the reset button being pressed. *2: Is OFF when the UVT power is not restored. *3: The OCR has a self-monitoring feature that monitors the OCR internal circuit, the tripping coil (TC) circuit, the undervoltage trip circuit (UVT), and the ACB state. An alarm caused by transient noise can be reset by pressing the reset button. If an alarm cannot be reset, check the ACB. See chapter 7. *4: Turns OFF automatically when the current decreases below the alarm pickup current setting. *5: A self-hold circuit is required. *6: Trip indication option is available instead of UVT operation indication. 39 KRB-5249

14 Table 22 Operation indication 2 Type of OCR AGR-22L-PS AGR-22L-PG AGR-22L-PGU AGR-22R-PS AGR-22R-PG AGR-22R-PGU AGR-22L-PG AGR-22L-PGU AGR-22R-PG AGR-22R-PGU AGR-22L-PGU AGR-22R-PGU AGR-22S-PSU All Control power supply Required Required Required Required Operation Long tome delay trip (LT) Short time delay trip (ST) Instantaneou s trip (INST/MCR) Pretrip alarm (PTA) N-phase protection (NP) System alarm Ground fault trip (GF) Adjustable undervoltage trip (UVT) Contact temperature monitor When activated TRIP I 6.40 ka LT T 24.0sec TRIP I 9.60 ka ST T 0.40sec TRIP I ka INST Remains normal TRIP I 2.56 ka LTN T 24.0sec ERROR 01 ABNORMAL CIRCUIT ERROR 03 TRIP FAIL ERROR 04 MHT CIRCUIT BRK ERROR 07 TING VALUE TRIP I 0.32 ka GF T 0.30sec ALARM I 0.16 ka GF T 0.20sec TRIP UVT Remains normal State When reset Returns to normal display LCD When alarm is caused by transient such as noise, LCD returns to normal display. * Returns to normal display * Returns to normal display * When alarm is caused by transient such as noise, LCD returns to normal display. * Returns to normal display Remarks LCD displays trip pickup current, trip cause and operating time. LCD displays trip pickup current and trip cause. LCD display remains normal. LCD displays trip pickup current, trip cause and operating time. LCD indicates that abnormality occurs in OCR internal circuit. LCD indicates that ACB fails to trip open even though trip signal is given. LCD indicates that circuitry of tripping coil (TC) or adjustable undervoltage trip device (UVT) is disconnected. LCD indicates that error is detected in OCR setting memory. LCD displays trip pickup current, trip cause and operating time. LCD displays trip cause. LCD display remains normal.. The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset. When other protective function is activated during operation indication, the trip cause and operating time are updated. (The trip pickup current is not updated.) * If system alarm indication cannot be reset, the ACB must be inspected. See chapter 7. Table 23 Operation indication 3 Contact output Terminal State Control Type of OCR Operation No. power Closing spring ACB open See Fig. ACB closed Not ready to close Reset 10 Charged Discharged Ready to close * * Required Trip 05, OFF ON OFF No change All Spring Required 05, 27 ON OFF No change charge The ACB can be opened, closed or tripped, irrespective of whether or not the operation indication is reset. * Ready to close means that all of the following conditions are met: 1. The closing springs are charged. 2. Opening operation is complete (At least 40 ms has elapsed after trip signal was produced). 3. The OFF button is released. 4. The specified voltage is applied to adjustable undervoltage trip device (if equipped). KRB

15 5-5. OCR Function Check CAUTION OCR function check and setting changes must be performed by competent persons. After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or burnout. Use the following procedure to perform OCR function check. 1) Open the ACB and draw out the breaker body to the TEST position. 2) To check the ACB along with the OCR, close the ACB. (For MCR check, close the ACB after test signal input.) 3) Follow the procedure described in Fig. 39 to check the ACB (and OCR) for normal operation. Note that the ACB will not operate in some modes. Monitor mode MONI MODE Phase current R phase, actual I A Initial display *1 Set mode MODE Test mode TEST MODE Numbers 1 5 represent the buttons on the OCR front panel. *1: The LCD returns to the initial display if no button is pressed for 30 seconds. *2: The test current is as follows: 6 x IR for L characteristic, 3 x IR for R characteristic and 1.2 x IR for S characteristic. *3: Use LED 6 in Fig. 38 to check the pretrip alarm function. *4: When checking the MCR function, close the ACB after applying the test current. *5: The corresponding LED is lit and contact output is provided. (Checking the OCR and the ACB involves ACB tripping operation. ) Use a tester to check for normal contact output. The operating time can be checked by comparing the reading on the LCD with the value derived from the applicable characteristic curve. (When the pretrip alarm function is checked, the operating time does not appear on the LCD. Use a timer to measure the operating time.) Type ANU-1 OCR checker (optional) should be used for accurate measurement of the operating time. MODE (-) Buttons on the OCR front panel SELECT (+) LCD ENT RE ESC Long tine delay trip/pretrip alarm TEST LT OCR + ACB operation *2 TEST I 6.00 IR LT. TRIP TEST START OK? OCR operation *2 TEST I 6.00 IR LT NON TRIP Test signal input *3 TEST LT >>> Trip Operating time/ Trip cause indication *5 TRIP I 6.00 IR LTD T 10.0sec Short time delay trip TEST ST OCR + ACB operation TEST I 12.0 In ST. TRIP TEST START OK? OCR operation TEST I 12.0 In ST NON TRIP Test signal input TEST ST >>> Trip Operating time/ Trip cause indication *5 TRIP I 12.0 In STD T 0.40sec Instantaneous trip/mcr TEST INST OCR + ACB operation TEST I 25.0 In INST. TRIP TEST START OK? OCR operation TEST I 25.0 In INST NON TRIP Test signal input *4 TEST INST >>> Trip Trip cause indication *5 TRIP I 25.0 INST In Fig. 39 OCR function check procedure 41 KRB-5249

16 5-6. OCR Characteristic Check OCR check must be performed by competent persons. CAUTION The following describes how to check the OCR characteristic. To check other items of OCR than described in this section, use type ANU-1 OCR checker (optional) Characteristic of adjustable undervoltage trip device (UVT) The following describes how to check the characteristic of the adjustable undervoltage trip device (UVT). 1) Make sure the following tools are available. Stopwatch Switches Slidax (300 VA) Voltmeter Cables Power supplies (UVT and control power supplies) 2) Open the ACB, turn off an upstream breaker to isolate the ACB main and control circuits from any power, and draw out the ACB body to the TEST position. 3) Make sure existing control power cables 08, 18, 28, 01, 11, and 21 are not energized and disconnect the cables, and then arrange the testing circuit as shown in Fig. 40. UVT Power supply Switch Slidax Voltmeter Fig. 40 Circuit arrangement for checking the characteristic of the undervoltage trip device Checking the UVT attraction voltage 4) Gradually increase the UVT supply voltage ( 08, 18, 28 ) starting from zero until the UVT operation indication LED (Fig ) turns green. Because it takes about 2 seconds for the UVT to start attraction after the attraction voltage is applied, the ACB Control power supply supply voltage must be increased stepwise at intervals of at least 2 seconds. The UVT characteristic is acceptable if the supply voltage at which the UVT operation indication LED turns green falls within the specified range. 5) Manually close the ACB to make sure the ACB can be closed. Checking the UVT tripping voltage 6) Increase the UVT supply voltage ( 08, 18, 28 ) to the rated voltage [Uc]. 7) Gradually decrease the UVT supply voltage until the UVT operation indication LED (Fig ) turns red indicating the ACB trips open. If a time delay is set, the UVT supply voltage must be decreased stepwise at appropriate intervals. The UVT characteristic is acceptable if the supply voltage at which the UVT operation indication LED turns red is within {[Uc] x 0.65} ±5%. 8) Remove the UVT supply voltage, and press the reset button (Fig ) to turn off the LED. Checking the UVT trip timing 9) Apply the rated voltage [Uc] to the UVT power supply terminals ( 08, 18, 28 ) and manually close the ACB. 10) Rapidly decrease the UVT supply voltage to [Uc] x 0.4 or less. At this time, use a stopwatch to measure the time required for the UVT operation indication LED (Fig ) to turn red indicating the ACB trips open. The UVT characteristic is acceptable if the time required for the UVT operation indication LED to turn red falls within the specified range. 11) Remove the UVT supply voltage, and press the reset button (Fig ) to turn off the LED. 12) Remove the testing circuit and restore the ACB wiring, body position and power supply. KRB