Improper use(alteration, accident, misuse, abuse) or Failure to act in accordance with installation, operation or maintenance instructions Unauthorized modification, changes or repair attempted Failure to comply with applicable safety standards regulations Damages when transporting or storing Damages by force majeure, (examples are not necessarily limited : fire, flood, earthquakes, storm damage, overvoltage lightning) If the original identify markings(trademark, serial number, etc) have been defaced, altered, or removed Rootech shall not be liable for any other claim than a claim solely for the breach of one of the above warranties that is made in accordance with the above described procedures made by the original purchaser
ACCURA 7500 Integrated Digital Protection Relay + High Accuracy Power Meter User Guide[English] Revision 6.00 2019/5/27 Accura 7500 User Guide Notice Notice Symbol Caution Indicates the presence of dangerous voltage which can cause electrical shock, severe injury or death to persons if proper precautions are not followed Caution Alerts the user to the presence of hazards which can cause somewhat injury to persons, loss to property or damage to the device itself, if proper precautions are not followed Note Indicates the user’s attention to installation, operating and maintenance instructions Indicates alternative voltage or current Indicates direct voltage or current Installation Considerations Installation and operation of Accura 7500 should be performed only by qualified, competent personnel that have appropriate training and experience with high voltage and current devices Caution During installation or use of this product, careless handling of hazardous voltage in field may result in severe injury or death to user During normal operation of Accura 7500, hazardous voltages always exists on the terminal strips connecting PT/CT, digital input, power supply, external I/O circuit power The PT/CT secondary can generate a deadly voltage/current due to energy on the primary side Standard safety precautions are as followed while performing any installation or service work [eg, removing PT fuses, shorting CT secondaries, etc] Do not access to terminal strips of Accura 7500 after installation External CT secondary should not be open ⓒ 2006 Rootech Inc All Rights Reserved Page Notice Accura 7500 User Guide Caution Failure to observe the following instructions may result in serious damage to the device Do not apply Accura 7500 to voltages and currents that exceed input ratings of PT and CT To use the device in the other way than specified by manufacturer can cause severe damage Connect the chassis ground terminal of the device to the earth ground to protect device from noise and surge Otherwise, the warranty is not guaranteed Terminal screw torque is as followed - barrier-type voltage terminal: 1.35 N∙m (14 kgf∙cm = 1.00 lbf∙ft) max - barrier-type digital inputs/digital output terminal: 0.90 N∙m (9 kgf∙cm = 0.66 lbf∙ft) max About Manual Rootech Inc reserves the right to make changes in the device specifications shown in this User Guide without notice Rootech Inc always recommends that customers review the latest specifications for their manuals and specifications before ordering the product In the absence of written agreement to the contrary, Rootech Inc assumes no liability for applications assistance, customer’s system design, or infringement of patents or copyrights of third parties by or arising from the use of devices described herein The information contained in this document is believed to be accurate at the time of publication, however, Rootech Inc assumes no responsibility for any errors which may appear here and reserves the right to make changes without notice Limitation of Liability Where applicable law allows and does not prohibit or restrict such limitation, the Rootech, Inc’s liability for anything relating to this product shall be limited to the price paid for the product Page ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Warranty Warranty For products and software that are sold or licensed by Rootech Inc during the period from the date of receipt by you until the present, Rootech warrants only to the original purchaser The purchased products shall be substantially free from material defects in material and workmanship by Rootech for two years from the date receipt by you The software itself is provided “as is” without any warranty of any kind In order for the original purchaser to make a claim under the warranties described above, the original purchaser must promptly contact Rootech headquarter After receiving such notice, Rootech may either in Rootech’s sole discretion, examine the product at the original purchaser’s site or issue shipping instructions to the original purchaser to return the relevant product to Rootech for examination at the original purchaser ’s expense, transportation charges prepaid If after examining the product Rootech reasonably confirms that such examined product does not meet the warranties, then the original purchaser’s sole remedy and Rootech’s sole obligation or liability shall be, at Rootech’s option, to repair, replace or refund the price paid for that product Limitation of Warranty The Warranty does not apply to uninterrupted or error-free operation of the Product or cover normal wear and tear of the product or costs caused by the removal, installation, or troubleshooting of the customer's electrical systems The warranty claims for defects caused by any of the following factors are not covered Improper use(alteration, accident, misuse, abuse) or Failure to act in accordance with installation, operation or maintenance instructions Unauthorized modification, changes or repair attempted Failure to comply with applicable safety standards & regulations Damages when transporting or storing Damages by force majeure, (examples are not necessarily limited : fire, flood, earthquakes, storm damage, overvoltage & lightning) If the original identify markings(trade-mark, serial number, etc) have been defaced, altered, or removed Rootech shall not be liable for any other claim than a claim solely for the breach of one of the above warranties that is made in accordance with the above described procedures- made by the original purchaser, ⓒ 2006 Rootech Inc All Rights Reserved Page Warranty Accura 7500 User Guide its employees, agents, or contractors for any loss, damage, or expense incurred due to, caused by, or related to any purchased product Any technical assistance provided by Rootech's personnel or representatives in system design shall be deemed to be a proposal and not a recommendation The responsibility for determining the feasibility of such proposals lies with the original purchaser and should be tested by the original purchaser It is the original purchaser’s responsibility to determine the suitability of any product and associated documentation for its purposes The original purchaser acknowledges that 100% "up" time is not realizable because of possible hardware or software defects The original purchaser recognizes that such defects and failures may cause inaccuracies or malfunctions Only the terms expressed in these limited Warranties shall apply and no distributor, corporation or other entity, individual or employee of Rootech or any other entity is authorized to amend, change or extend the Warranties in any way Standard Compliance PROCESS CONTROL EQUIPMENT E324900 MSIP-REM-RTE-Accura 7500 QMS-1347 Page KAB-QC-09 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Revision History Revision History The following versions of Accura 7500 User Guide have been released Revision Date Description Revision 1.0 2006 05 02 Initial draft Revision 1.1 2007 03 06 Revision Revision 1.2 2007 07 01 Wiring diagram changed Revision 1.3 2008 12 30 Applied from Relay Ver2.11 DI input is connected to output as DO Revision 3.0 2010 03 03 OVGR, UVR, SGR multi-stage configuration possible Revision 5.0 2010 12 01 Motor Protection element added Manual revision number is same as ‘Protection Relay’ Software version For Software Version 5.0 or less, please refer to User's Manual Revision 3.0 Revision 5.1 2012 07 09 Table 9.2 value added Revision 5.2 2013 02 27 Table 9.1 Change of K value of LI Curve and accordingly Table 9.6 Timetable contents changed Revision 5.3 2013 03 08 Cautions related to SGR MTA configuration added[page 123] Revision 5.4 2013 03 15 Wiring diagram changed[page 45 ~ 47] Inverse time LI characteristic table error changed[page 182] Revision 5.5 2014 03 17 F / W Ver From 5.07 Motor Protection function Added explanation about changing Ip reflection method of THR[page 28, 110, 191] CB ON, OFF Cautions when wiring control signal[page 44, 204] Revision 5.6 2016 03 22 Inverse time LI characteristic curve error correction [page 183] Revision 5.9 2016 10 24 Added description of F/W Version reflecting inverse time LI characteristic curve change [Table 9.1 Note] Revision 6.0 2019 05 27 ⓒ 2006 Rootech Inc All Rights Reserved Overall Format Change Page Contents Accura 7500 Guide Contents Chapter Introduction 17 Overview 17 Features 18 Application 19 Chapter Technical Specification 20 Protection Relay 20 Measurement 26 Measurement Test 27 Reliability Test 28 Control 29 Input & Output 30 Communication 31 User Interface 31 Others 32 Related Compliance 32 Chapter Product Installation 33 Installation Conditions 33 Before Installation 33 Dimension 34 Step 1: Panel Mounting 36 Detachment and assembly of the unit for repair 37 Step 2: External Wiring 38 Wiring diagram example (3P4W 3PTs, 3CTs) 39 Wiring diagram example (3P3W 3PTs, 3CTs) 40 Wiring diagram example (3P3W 2PTs, 2CTs) 41 Rear panel terminal arrangement diagram 42 Description of the rear panel terminals 43 Block diagram 45 Chapter Meter Operation/Setup 46 Display Mode 47 Function of Group E LED 47 Setup Mode 50 Reset Mode 52 System Mode 53 Reactive power calculation method 54 Chapter Operating the Protection Relay 57 Page ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 Guide Contents LED Display Content 58 Key Control 59 Entering the Passcode 60 LCD Display and Change setup values 61 Chapter Protection Relay Setup and Analysis 64 OCR Setup 65 Inverse time OCR 65 Instantaneous time OCR 67 NSOCR Setup 68 Inverse time NSOCR 69 Instantaneous time NSOCR 71 OCGR Setup 72 Inverse time OCGR 72 Definite time OCGR 74 Instantaneous time OCGR 75 OVR Setup 76 Definite time OVR 76 Instantaneous time OVR 78 NSOVR Setup 79 Definite time NSOVR 80 POR Setup 82 Definite time POR 82 UVR Setup 84 Definite time UVR 85 Other UVR setup 87 Motor Protection Elements Setup 88 THR 89 Lock 92 Motor start 92 Under current 94 OVGR Setup 95 Definite time OVGR 95 Instantaneous time OVGR 97 SGR Setup 98 Definite time SGR 99 Fault Reset 101 Record (Event record) 101 Chapter Checking Relay Status 103 ⓒ 2006 Rootech Inc All Rights Reserved Page Contents Accura 7500 Guide Voltage 104 Current 104 DI status 105 DO status 105 Event record 105 CB Counter 106 Program version 107 Passcode 109 Record Deletion 111 DIN Setup 113 DO Setup 116 DO related with Relay 118 DO Control 122 LCD Setup 124 PT Failure(Fault Detection) 126 CB Failure(Fault Detection) 129 Protection Blocking Function 132 Date Setup 135 DO related with DI 137 Chapter Protection Relay Characteristic 140 Inverse Time Curve Characteristic 140 IEC Curves 140 KEPCO Curves 141 Selective Ground Relay (SGR) Characteristic 154 Instantaneous Time, Definite Time Characteristic 155 THR Characteristic 156 Motor Starting Characteristic 162 Chapter 10 Setup Examples 163 Automatic Power Recovery Function Setup 163 UVR Setup 163 DIN Setup 164 Precautions 165 APPENDIX A Design Example 166 3-Phase 4-Wire 166 3-Phase 3-Wire : 3PT, 2CT 167 3-Phase 3-Wire : Open-Delta, 2CT 168 Sequence Diagram 169 Page 10 ⓒ 2006 Rootech Inc All Rights Reserved Chapter Protection Relay Characteristic Accura 7500 User Guide THR Characteristic The thermal overload protection based on heat generation estimation is one of important functions to observe thermal damage due to overload during motor operation The algorithm of this function tracks the temperature rise of the motor through the current flowing in the motor The degree of heating of the motor (the thermal accumulation value) are cumulatively managed by inverse characteristic If the motor was stopped for a long time, it would be equal to the ambient temperature and the thermal accumulation value will be zero If the motor is overloaded and the thermal accumulation value exceeds 100%, the protection function is activated and a trip or alarm function is performed If the load current of the motor exceeds the set overload level, it is defined as an overload condition That is, the accumulation of heat becomes more than the cooling of the heat The thermal model operates by increasing the thermal accumulation value according to the selected thermal curve and overload level Thermal Curve of THR is a formula and graph showing the operating time characteristic for current and divided into Cold Curve and Hot Curve The Cold Curve is a characteristic curve expressing the relationship between the current and the operating time when the previous thermal accumulation value is zero and the motor starts to run It is a characteristic curve expressing the relation as follows 𝑡 = τ ∙ ln 𝐼2 𝐼 − (𝑘 ∙ 𝐼B )2 where, 𝑡 = Operation Time (or Trip Time) 𝜏 = Heat Rise Time constant 𝐼B = Basic Current, Rated Motor Current (Im) 𝑘 = Overload factor 𝐼 = Relay Input Current The graph shows a curve with Ip = 0.0 (that is, the thermal accumulation value = 0) in Fig 9.8 Figure 9.8 THR Thermal Curve Page 156 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Chapter Protection Relay Characteristic t Ip=0.0 Ip=0.8 IB k·IB I The Hot Curve is a characteristic curve expressing the relationship between the current and the operating time when the previous thermal accumulation value is not zero and the motor starts to run The previous thermal accumulation value is generated by Ip It is a characteristic curve expressing the relation as follows 𝑡 = τ ∙ ln 𝐼 − 𝐼p 𝐼 − (𝑘 ∙ 𝐼B )2 where, 𝐼p = previous load current Among the items to set the motor specifications, 'Rated Motor Current' indicates the ratio of the full load current to the primary rating of the CT ‘Overload factor k' defines the allowable overload of the motor The thermal accumulation value is accumulated when the motor current exceeds the rated motor current multiplied by k In the basic properties of the curve, the thermal accumulation value increases in proportion to the value of 'Heat Rise Time Constant 𝜏‘ ⓒ 2006 Rootech Inc All Rights Reserved Page 157 Chapter Protection Relay Characteristic Accura 7500 User Guide Table 9.9 THR Cold Curve Timetable THR(49) Time Characteristics [t/τ (sec)] Previous load current = 0.0 I/Ib Page 158 Cold Overload factor k 0.80 0.85 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1.00 61.30 76.92 99.64 1.10 45.16 54.55 66.41 105.08 1.20 35.27 41.80 49.60 71.14 110.06 1.30 28.56 33.47 39.15 53.75 75.52 114.66 1.40 23.72 27.59 31.99 42.83 57.64 79.61 118.94 1.50 20.08 23.24 26.78 35.27 46.30 61.30 83.44 122.93 1.60 17.26 19.90 22.82 29.72 38.39 49.60 64.76 87.05 126.67 1.70 15.02 17.26 19.73 25.48 32.55 41.38 52.74 68.03 90.45 1.80 13.20 15.14 17.26 22.15 28.05 35.27 44.24 55.72 71.14 1.90 11.71 13.40 15.25 19.46 24.49 30.54 37.88 46.98 58.57 2.00 10.46 11.95 13.58 17.26 21.62 26.78 32.94 40.40 49.60 2.20 8.51 9.70 10.99 13.89 17.26 21.19 25.77 31.15 37.52 2.40 7.07 8.04 9.09 11.44 14.15 17.26 20.84 24.96 29.72 2.60 5.97 6.78 7.66 9.61 11.83 14.37 17.26 20.54 24.28 2.80 5.11 5.80 6.54 8.19 10.06 12.18 14.57 17.26 20.30 3.00 4.43 5.02 5.66 7.07 8.66 10.46 12.48 14.74 17.26 3.20 3.87 4.39 4.94 6.17 7.54 9.09 10.82 12.75 14.89 3.40 3.42 3.87 4.36 5.43 6.63 7.98 9.48 11.15 12.99 3.60 3.04 3.44 3.87 4.82 5.88 7.07 8.38 9.84 11.44 3.80 2.72 3.08 3.46 4.31 5.25 6.30 7.47 8.75 10.16 4.00 2.45 2.77 3.12 3.87 4.72 5.66 6.70 7.84 9.09 4.20 2.22 2.51 2.82 3.50 4.26 5.11 6.04 7.07 8.19 4.40 2.02 2.28 2.56 3.18 3.87 4.64 5.48 6.40 7.41 4.60 1.84 2.08 2.34 2.90 3.53 4.23 4.99 5.83 6.75 4.80 1.69 1.91 2.15 2.66 3.24 3.87 4.57 5.33 6.17 5.00 1.56 1.76 1.98 2.45 2.98 3.56 4.20 4.90 5.66 6.00 1.08 1.22 1.37 1.69 2.05 2.45 2.88 3.36 3.87 7.00 0.79 0.89 1.00 1.24 1.50 1.79 2.11 2.45 2.82 8.00 0.60 0.68 0.76 0.94 1.15 1.37 1.61 1.87 2.15 9.00 0.48 0.54 0.60 0.75 0.90 1.08 1.27 1.47 1.69 10.00 0.39 0.44 0.49 0.60 0.73 0.87 1.02 1.19 1.37 12.00 0.27 0.30 0.34 0.42 0.51 0.60 0.71 0.82 0.94 14.00 0.20 0.22 0.25 0.31 0.37 0.44 0.52 0.60 0.69 16.00 0.15 0.17 0.19 0.23 0.28 0.34 0.40 0.46 0.53 18.00 0.12 0.13 0.15 0.19 0.22 0.27 0.31 0.36 0.42 20.00 0.10 0.11 0.12 0.15 0.18 0.22 0.25 0.29 0.34 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Chapter Protection Relay Characteristic Table 9.10 THR Hot Curve Timetable THR(49) Time Characteristics [t/τ (sec)] Previous load current = 1.0 I/Ib Hot Overload factor k 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.05 1.10 40.18 1.20 15.91 38.92 79.22 1.30 9.65 21.77 37.80 60.91 101.31 1.40 6.77 14.81 24.56 36.79 52.90 76.11 116.60 1.50 5.13 11.04 17.90 26.03 35.87 48.18 64.38 87.66 128.22 1.60 4.08 8.67 13.90 19.88 26.83 35.04 44.95 57.33 73.60 96.95 1.70 3.35 7.07 11.23 15.90 21.20 27.26 34.28 42.55 52.53 64.97 1.80 2.81 5.91 9.33 13.12 17.35 22.09 27.45 33.58 40.66 48.99 1.90 2.40 5.03 7.91 11.08 14.56 18.42 22.71 27.51 32.93 39.11 2.00 2.09 4.35 6.82 9.52 12.46 15.68 19.23 23.14 27.48 32.34 2.20 1.62 3.37 5.26 7.30 9.50 11.88 14.46 17.26 20.31 23.63 2.40 1.31 2.71 4.21 5.82 7.55 9.40 11.38 13.51 15.81 18.28 2.60 1.08 2.23 3.46 4.77 6.17 7.66 9.24 10.94 12.75 14.68 2.80 0.91 1.87 2.90 3.99 5.15 6.38 7.69 9.07 10.55 12.11 3.00 0.77 1.60 2.47 3.39 4.37 5.41 6.51 7.67 8.90 10.19 3.20 0.67 1.38 2.13 2.93 3.77 4.66 5.59 6.58 7.62 8.72 3.40 0.59 1.21 1.86 2.55 3.28 4.05 4.87 5.72 6.62 7.56 3.60 0.52 1.06 1.64 2.25 2.89 3.57 4.27 5.02 5.80 6.62 3.80 0.46 0.94 1.46 2.00 2.57 3.16 3.79 4.45 5.14 5.86 4.00 0.41 0.85 1.30 1.79 2.29 2.83 3.38 3.97 4.58 5.22 4.20 0.37 0.76 1.17 1.61 2.06 2.54 3.04 3.57 4.11 4.69 4.40 0.34 0.69 1.06 1.46 1.87 2.30 2.75 3.22 3.72 4.23 4.60 0.31 0.63 0.97 1.32 1.70 2.09 2.50 2.93 3.37 3.84 4.80 0.28 0.57 0.88 1.21 1.55 1.91 2.28 2.67 3.08 3.50 5.00 0.26 0.53 0.81 1.11 1.42 1.75 2.09 2.45 2.82 3.21 6.00 0.18 0.36 0.56 0.76 0.97 1.19 1.43 1.67 1.92 2.18 7.00 0.13 0.26 0.40 0.55 0.71 0.87 1.04 1.21 1.39 1.58 8.00 0.10 0.20 0.31 0.42 0.54 0.66 0.79 0.92 1.06 1.20 9.00 0.08 0.16 0.24 0.33 0.42 0.52 0.62 0.72 0.83 0.94 10.00 0.06 0.13 0.20 0.27 0.34 0.42 0.50 0.58 0.67 0.76 12.00 0.04 0.09 0.14 0.18 0.24 0.29 0.35 0.40 0.46 0.53 14.00 0.03 0.06 0.10 0.14 0.17 0.21 0.25 0.30 0.34 0.39 16.00 0.02 0.05 0.08 0.10 0.13 0.16 0.19 0.23 0.26 0.29 18.00 0.02 0.04 0.06 0.08 0.10 0.13 0.15 0.18 0.21 0.23 20.00 0.02 0.03 0.05 0.07 0.08 0.10 0.12 0.14 0.17 0.19 ⓒ 2006 Rootech Inc All Rights Reserved Page 159 Chapter Protection Relay Characteristic Accura 7500 User Guide Table 9.11 THR Hot Curve Timetable THR(49) Time Characteristics [t/τ (sec)] Previous load current = 0.9 I/Ib Hot Overload factor k 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.05 Page 160 1.10 78.84 1.20 37.45 60.46 100.76 1.30 24.24 36.37 52.39 75.51 115.91 1.40 17.61 25.65 35.40 47.62 63.74 86.95 127.43 1.50 13.62 19.53 26.39 34.52 44.36 56.67 72.87 96.15 136.71 1.60 10.97 15.57 20.79 26.78 33.73 41.93 51.85 64.23 80.50 103.85 1.70 9.09 12.81 16.97 21.65 26.94 33.00 40.02 48.30 58.28 70.72 1.80 7.70 10.79 14.21 18.01 22.24 26.98 32.34 38.46 45.54 53.88 1.90 6.62 9.25 12.13 15.29 18.78 22.64 26.93 31.73 37.15 43.33 2.00 5.77 8.04 10.51 13.20 16.14 19.37 22.91 26.82 31.17 36.02 2.20 4.52 6.27 8.16 10.20 12.40 14.78 17.36 20.16 23.20 26.53 2.40 3.65 5.06 6.56 8.17 9.89 11.74 13.73 15.86 18.16 20.63 2.60 3.02 4.18 5.40 6.72 8.11 9.60 11.19 12.89 14.69 16.63 2.80 2.55 3.51 4.54 5.63 6.79 8.02 9.33 10.72 12.19 13.75 3.00 2.18 3.00 3.88 4.80 5.78 6.82 7.92 9.08 10.31 11.60 3.20 1.89 2.60 3.35 4.15 4.99 5.88 6.81 7.80 8.84 9.94 3.40 1.66 2.28 2.93 3.62 4.35 5.12 5.94 6.79 7.69 8.63 3.60 1.46 2.01 2.59 3.19 3.84 4.51 5.22 5.97 6.75 7.57 3.80 1.30 1.79 2.30 2.84 3.41 4.00 4.63 5.29 5.98 6.70 4.00 1.17 1.60 2.06 2.54 3.05 3.58 4.14 4.72 5.34 5.98 4.20 1.05 1.44 1.86 2.29 2.74 3.22 3.72 4.25 4.79 5.37 4.40 0.95 1.31 1.68 2.07 2.48 2.92 3.37 3.84 4.33 4.85 4.60 0.87 1.19 1.53 1.89 2.26 2.65 3.06 3.49 3.94 4.40 4.80 0.79 1.09 1.40 1.72 2.07 2.42 2.80 3.19 3.59 4.02 5.00 0.73 1.00 1.28 1.58 1.90 2.22 2.57 2.92 3.29 3.68 6.00 0.50 0.69 0.88 1.08 1.30 1.52 1.75 1.99 2.25 2.51 7.00 0.37 0.50 0.64 0.79 0.94 1.11 1.27 1.45 1.63 1.82 8.00 0.28 0.38 0.49 0.60 0.72 0.84 0.97 1.10 1.24 1.38 9.00 0.22 0.30 0.38 0.47 0.57 0.66 0.76 0.87 0.97 1.09 10.00 0.18 0.24 0.31 0.38 0.46 0.53 0.62 0.70 0.79 0.88 12.00 0.12 0.17 0.22 0.26 0.32 0.37 0.43 0.48 0.54 0.61 14.00 0.09 0.12 0.16 0.19 0.23 0.27 0.31 0.35 0.40 0.44 16.00 0.07 0.09 0.12 0.15 0.18 0.21 0.24 0.27 0.30 0.34 18.00 0.05 0.07 0.10 0.12 0.14 0.16 0.19 0.21 0.24 0.27 20.00 0.04 0.06 0.08 0.09 0.11 0.13 0.15 0.17 0.19 0.22 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Chapter Protection Relay Characteristic Table 9.12 THR Hot Curve Timetable THR(49) Time Characteristics [t/τ (sec)] Previous load current = 0.8 I/Ib Hot Overload factor k 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.05 1.10 100.09 1.20 51.78 74.79 115.09 1.30 34.84 46.97 62.99 86.11 126.51 1.40 25.88 33.92 43.67 55.89 72.01 95.22 135.71 1.50 20.32 26.22 33.09 41.22 51.06 63.36 79.56 102.85 143.41 1.60 16.54 21.13 26.35 32.34 39.29 47.50 57.41 69.79 86.06 109.41 1.70 13.81 17.53 21.69 26.36 31.66 37.72 44.74 53.01 62.99 75.43 1.80 11.75 14.85 18.27 22.06 26.29 31.04 36.40 42.52 49.60 57.93 1.90 10.16 12.79 15.67 18.83 22.32 26.17 30.46 35.27 40.69 46.86 2.00 8.89 11.15 13.62 16.32 19.26 22.48 26.03 29.94 34.28 39.14 2.20 7.00 8.75 10.64 12.68 14.88 17.26 19.84 22.64 25.68 29.01 2.40 5.68 7.08 8.58 10.19 11.92 13.77 15.76 17.89 20.18 22.65 2.60 4.71 5.87 7.09 8.41 9.80 11.29 12.88 14.58 16.38 18.32 2.80 3.98 4.95 5.98 7.07 8.23 9.46 10.76 12.15 13.62 15.19 3.00 3.41 4.24 5.11 6.04 7.02 8.05 9.15 10.31 11.54 12.83 3.20 2.96 3.67 4.42 5.22 6.06 6.95 7.89 8.88 9.92 11.01 3.40 2.60 3.22 3.87 4.56 5.30 6.07 6.88 7.73 8.63 9.57 3.60 2.30 2.84 3.42 4.03 4.67 5.34 6.05 6.80 7.58 8.40 3.80 2.05 2.53 3.04 3.58 4.15 4.75 5.38 6.03 6.72 7.44 4.00 1.83 2.27 2.73 3.21 3.72 4.25 4.81 5.39 6.00 6.64 4.20 1.65 2.05 2.46 2.89 3.35 3.83 4.33 4.85 5.40 5.97 4.40 1.50 1.86 2.23 2.62 3.03 3.46 3.92 4.39 4.88 5.40 4.60 1.37 1.69 2.03 2.39 2.76 3.15 3.56 3.99 4.44 4.90 4.80 1.25 1.55 1.86 2.18 2.52 2.88 3.25 3.64 4.05 4.48 5.00 1.15 1.42 1.71 2.00 2.32 2.64 2.99 3.34 3.71 4.10 6.00 0.79 0.98 1.17 1.37 1.59 1.81 2.04 2.28 2.53 2.80 7.00 0.58 0.71 0.85 1.00 1.16 1.32 1.49 1.66 1.84 2.03 8.00 0.44 0.54 0.65 0.76 0.88 1.00 1.13 1.26 1.40 1.54 9.00 0.35 0.43 0.51 0.60 0.69 0.79 0.89 0.99 1.10 1.21 10.00 0.28 0.35 0.41 0.49 0.56 0.64 0.72 0.80 0.89 0.98 12.00 0.19 0.24 0.29 0.34 0.39 0.44 0.50 0.56 0.62 0.68 14.00 0.14 0.18 0.21 0.25 0.28 0.32 0.36 0.41 0.45 0.50 16.00 0.11 0.13 0.16 0.19 0.22 0.25 0.28 0.31 0.34 0.38 18.00 0.09 0.11 0.13 0.15 0.17 0.20 0.22 0.25 0.27 0.30 20.00 0.07 0.09 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 ⓒ 2006 Rootech Inc All Rights Reserved Page 161 Chapter Protection Relay Characteristic Accura 7500 User Guide Motor Starting Characteristic In order to prevent burnout due to overload during starting of motor, set I2 ∙ T , which is allowable starting current and starting time provided by motor manufacturer Starting current and starting time is proportional to the short-term thermal load characteristic of the motor, and the integral equation of the instantaneous current is as follows TStarting I2 ∙ T = ∫ i(t)2 dt where, 𝐼 = Allowable starting current 𝑇𝑆𝑡𝑎𝑟𝑡𝑖𝑛𝑔 = Allowable starting time The point to start integrating the starting current is from when the current of the motor exceeds starting current setup within 100ms from when the current flows more than 10% of the rated current When the current drops below starting current setup, the starting condition is reset and this protection element does not operate If the current drops below 10% of the motor rated current, the motor will be acknowledged to be in a stop state and this protection element will be a condition that can protect the next start state Page 162 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Chapter 10 Setup Examples Chapter 10 Setup Examples Automatic Power Recovery Function Setup For Accura 7500, in case of blackout, after the circuit breaker(CB) is turned OFF(OPEN), the setup for sequential ON(CLOSE) from the upper feeder CB when power is recovered must be appropriately set in [UVR] and the [Setup > DIN Setup] menu UVR Setup Accura 7500 provides definite time and instantaneous time characteristic in UVR, and here we take definite time UVR characteristic for example For blackout monitoring, the under voltage relay UVR[27] must be set first If ‘UVR’ key is pressed, the definite time UVR setup initial screen appears as in Figure 10.1 Figure 10.1 UVR setup initial screen To set the definite time UVR, press ‘ENTER’ key when the line cursor is over the first row in the UVR setup initial screen as in Figure 10.1, then the definite time UVR setup screen will appear in the LCD as in Figure 10.2 Figure 10.2 Definite time UVR setup screen To operate UVR, set the first item from ‘OFF ’ to other conditions Setup can be performed among ‘trip (T)’, ‘alarm (A)’, and ‘T&A’ To trip CB, set ‘trip(T)’ or ‘T&A’ For ‘Pickup’ and ‘Delay’ items, set the pickup value and delay time as in other definite time relay elements The ‘Reset Time’ is the item to set the time until the UVR Fault is reset after the UVR operating condition is disappeared(Power recovery after blackout) In Accura 7500, the operating relay elements are recovered by pressing ‘Fault Reset’ key in ‘Local’ state (front panel key) after all the relay elements are in operation However, for automatic power recovery, once the fault cause is removed, then UVR is automatically fault-reset ⓒ 2006 Rootech Inc All Rights Reserved Page 163 Chapter 10 Setup Examples Accura 7500 User Guide and so the condition for automatically close CB is satisfied Then, it is possible to sequentially close CB for each feeder if ‘Reset Time’ item is set differently for each feeder In addition, in case the starting signal for an emergency generator is required for blackout in the incoming high-voltage switchboard, if the DOUT output channel operated in conjunction with the UVR is selected in the fourth item of the [Setup > DO Relay] menu, a starting signal is generated through the set DOUT channel when UVR operates For example, if ‘DOUT4’ is selected, the DOUT4 contactor(A Type) is turned on when blackout occurs and is used as the starting signal DIN Setup If CB is tripped by UVR and power is recovered from blackout, Fault Reset is automatically done, and CB can be closed again Therefore, if the CB is set to be automatically closed, power is automatically recovered Figure 10.3 DIN setup screen In the [Setup > DIN Setup] menu of Figure 10.3, set ‘Delay Time’ and ‘UVRRestore’ ‘Delay time’ is set between 0.0 and 10.0 seconds in 0.1 second step This is the time that should be maintained to recognize the input signal If this time is set to 0.5 seconds, then the change in the input signal is recognized after 0.5 seconds after an external input is applied By setting the delay time, , it is possible to prevent an instantaneous influence due to the external noise For ‘UVRrestore’, select among ‘None’ and ‘DIN1 ~ DIN10’ ‘None’ is set for no input channel If digital input channel is used, set ‘DIN1’ as in Figure 10.4 If a signal (DC110/125V) is applied between digital input terminal DI1 and DIG, CB is automatically close by the ‘Remote Close’ function Figure 10.4 Setup screen for Power recovery CB input channel To so, for example, there’s a design that puts the ‘Auto’ and ‘Manual’ selection switch on front panel of the switchboard, and if ‘Manual’ is selected, the voltage is not applied to the corresponding digital input terminal Page 164 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Chapter 10 Setup Examples and if ‘Auto’ is selected, CB is automatically closed by applying a voltage to the corresponding digital input terminal However, the automatic closing of CB by the ‘Automatic power recovery’ function is possible only when Accura 7500 is in ‘Remote’ state For on-site manual control, the ‘Automatic power recovery’ function is disabled if it’s in ‘Local’ state In addition, the automatic closing of CB is performed when UVR is in operation and then recovered (power recovery) That is, the CB is closed only when UVR is operational, UVR is recovered (Fault Reset), Accura 7500 is in ‘Remote’ state, and signal is applied to the DIN channel set in the [Setup > DIN Setup > UVRrestore] menu Precautions While “Automatic power recovery” function can be done without human control, there’s also a risk of accident due to automatic closing of CB So special caution must be taken and the following rules must be kept in mind If any relay elements other than ‘UVR’ is occured, ‘Fault Reset’ (fault disable) is not done automatically even after the CB is tripped and the cause of the fault is removed So Fault Reset is done by on-site key control or communication In this case, if the ‘Automatic power recovery’ function is set, CB is closed immediately after ‘Fault Reset’, risking the safety of the operator Also, if the cause of the accident has not been analyzed and the fault cause has not been removed, there’s a risk of re-tripping and spreading of the accident To avoid this kind of situation, First, on site, put Accura 7500 into ‘Local’ mode and perform ‘Fault Reset’ Second, the more obvious method is to remove the voltage applied to the corresponding digital input channel set in [Setup > DIN Setup > UVRrestore] menu In case the ‘Auto’ and ‘Manual’ selection switch is used, switch it to the ‘Manual’ mode Third, in case of remote control by communication, change the setup of the ‘UVRrestore’ to ‘None’ and send the ‘Fault Reset’ command After taking the above actions, analyze and remove the cause of the fault to avoid the occurrence of additional faults, and then set the ‘Automatic power recovery’ function again ⓒ 2006 Rootech Inc All Rights Reserved Page 165 Appendix A Design Example Accura 7500 User Guide APPENDIX A Design Example 3-Phase 4-Wire Page 166 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Appendix A Design Example 3-Phase 3-Wire : 3PT, 2CT ⓒ 2006 Rootech Inc All Rights Reserved Page 167 Appendix A Design Example Accura 7500 User Guide 3-Phase 3-Wire : Open-Delta, 2CT Page 168 ⓒ 2006 Rootech Inc All Rights Reserved Accura 7500 User Guide Appendix A Design Example Sequence Diagram Note If the CB control output (CBON, CBONG, CBOFF, CBOFFG) and circuit breaker (CB) are directly wired and used, it is recommended that the wiring is made through the auxiliary relay because the internal contactors of Accura 7500 may deteriorate and burn out ⓒ 2006 Rootech Inc All Rights Reserved Page 169 Accura 7500 User Guide Integrated Digital Protection Relay Rootech 102-611 Digital Empire2, Sinwon-ro 88 Yeongtong-gu, Suwon, Gyeonggi-do, Korea Tel +82+31-695-7350 Fax +82+31-695-7399 www.rootech.com supervisor@rootech.com ⓒ 2006 Rootech Inc All Rights Reserved Accura EMeter, Accura 2300S/2350, Accura 2700/2750, Accura 3000/3300S/3300, Accura 3500S/3500, Accura 3550S/3550, Accura 3700, Accura 5500, Accura 7500 are trademarks of Rootech Inc Contact rootech for detailed specifications and order information ... A VL-N, VL-L, IRMS, IFUND, kW, kVAR, kVA, PF B DMD, MAX, MIN C VTHD, ITHD D kWh, kVARh, kVAh, Hz Function of Group E LED Average LED Indicates the average of the displayed values of the A, B and... relay: POWER, Communication, Error, Trip information, Remote, Local, CB ON, CB OFF, Fault and operation status, function key selection display Control key Item Area Type meter: MENU, ? ?, ? ?, ENTER... THD, harmonics analysis and k factor ⓒ 2006 Rootech Inc All Rights Reserved Page 17 Chapter Introduction Accura 7500 User Guide Features Protection relay 2 7, 3 7, 4 6, 4 7, 4 8, 5 0, 5 1, 50G, 51G,