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
Trang 1ACCURA 7500
Integrated Digital Protection Relay + High Accuracy Power Meter
User Guide[English]
Trang 3Accura 7500 User Guide Notice
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
Trang 4Notice 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
Trang 5Accura 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,
Trang 6Warranty 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
Trang 7Accura 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 Overall Format Change
Trang 8Contents Accura 7500 Guide
Contents
Chapter 1 Introduction 17
Overview 17
Features 18
Application 19
Chapter 2 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 3 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 4 Meter Operation/Setup 46
Display Mode 47
Function of Group E LED 47
Setup Mode 50
Trang 9Accura 7500 Guide Contents
LED Display Content 58
Key Control 59
Entering the Passcode 60
LCD Display and Change setup values 61
Chapter 6 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 7 Checking Relay Status 103
Trang 10Contents 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 9 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
Trang 11Accura 7500 Guide Contents
Figures
Figure 3.1 Accura 7500 front 34
Figure 3.2 Accura 7500 rear 34
Figure 3.3 Accura 7500 side 35
Figure 3.4 Assembly structure 36
Figure 3.5 Panel assembly method 36
Figure 3.6 Panel cutting 37
Figure 3.7 Detachment of the unit from the chassis 37
Figure 3.8 Wiring diagram(3P4W 3PTs, 3CTs) 39
Figure 3.9 Wiring diagram (3P3W 3PTs, 3CTs) 40
Figure 3.10 Wiring diagram (3P3W 2PTs, 2CTs: 3P3O) 41
Figure 3.11 Rear panel terminal arrangement diagram 42
Figure 3.12 Block diagram 45
Figure 4.1 Front panel for display and control 46
Figure 4.2 Display group 47
Figure 4.3 Power signs 55
Figure 4.4 Apparent power vector diagram 55
Figure 5.1 Front panel for display and control 57
Figure 5.2 Passcode input screen 60
Figure 5.3 Typing the passcode 61
Figure 5.4 OCR setup initial screen 61
Figure 5.5 Inverse time OCR setup screen 62
Figure 5.6 Screen with a partial cursor in the setup selection value when the setup value is changed 62
Figure 5.7 Screen with a partial cursor in the setup numerical value when the setup value is changed 62
Figure 5.8 Screen with asking for final confirmation 63
Figure 5.9 Screen with notifying that change is complete 63
Figure 5.10 Screen with notifying that change is cancelled 63
Figure 6.1 Protection relay part 64
Figure 6.2 OCR setup initial screen 65
Figure 6.3 Inverse time OCR setup screen 65
Figure 6.4 Status where the partial cursor appears for change 66
Figure 6.5 Status in which ‘ENTER’ key was pressed after changing setup items 66
Figure 6.6 Confirmation of setup value change 67
Figure 6.7 Notifying change is completed 67
Figure 6.8 Notifying change is cancelled 67
Figure 6.9 Instantaneous time OCR setup screen 68
Figure 6.10 NSOCR setup initial screen 68
Trang 12Contents Accura 7500 Guide
Figure 6.11 Inverse time NSOCR setup screen 69
Figure 6.12 Status where the partial cursor appears for change 70
Figure 6.13 Status in which ‘ENTER’ key was pressed after changing setup items 70
Figure 6.14 Confirmation of setup value change 70
Figure 6.15 Notifying change is completed 71
Figure 6.16 Notifying change is cancelled 71
Figure 6.17 Instantaneous time NSOCR setup screen 71
Figure 6.18 OCGR setup initial screen 72
Figure 6.19 Inverse time OCGR setup screen 72
Figure 6.20 Status where the partial cursor appears for change 73
Figure 6.21 Status after setup item is changed and ‘ENTER’ key is pressed 73
Figure 6.22 setup value change confirmation screen 74
Figure 6.23 Notifying change is completed 74
Figure 6.24 Notifying change is cancelled 74
Figure 6.25 Definite time OCGR setup screen 74
Figure 6.26 Instantaneous time OCGR setup screen 75
Figure 6.27 OVR setup initial screen 76
Figure 6.28 Definite time OVR setup screen 76
Figure 6.29 Status where the partial cursor appears for change 77
Figure 6.30 Status in which ‘ENTER’ key was pressed after changing setup items 77
Figure 6.31 Setup value change confirmation screen 78
Figure 6.32 Notifying change is completed 78
Figure 6.33 Notifying change is cancelled 78
Figure 6.34 Instantaneous time OVR setup screen 78
Figure 6.35 OVR setup initial screen 79
Figure 6.36 Definite time NSOVR setup screen 80
Figure 6.37 Status where the partial cursor appears for change 80
Figure 6.38 Status in which ‘ENTER’ key was pressed after changing setup items 81
Figure 6.39 Setup value change confirmation screen 81
Figure 6.40 Notifying change is completed 81
Figure 6.41 Notifying change is cancelled 81
Figure 6.42 POR setup initial screen 82
Figure 6.43 Definite time POR setup screen 82
Figure 6.44 Status where the partial cursor appears for change 83
Trang 13Accura 7500 Guide Contents
Figure 6.49 UVR setup initial screen 84
Figure 6.50 Definite time UVR setup screen 85
Figure 6.51 Status where the partial cursor appears for change 86
Figure 6.52 Status in which ‘ENTER’ key was pressed after changing setup items 86
Figure 6.53 Setup value change confirmation screen 87
Figure 6.54 Notifying change is completed 87
Figure 6.55 Notifying change is cancelled 87
Figure 6.56 Other UVR setup screen 87
Figure 6.57 Setup initial screen of MOTOR protection elements 88
Figure 6.58 THR setup initial screen 89
Figure 6.59 THR setup Last item display screen 89
Figure 6.60 Status where the partial cursor appears for change 90
Figure 6.61 After changing the setup item, press the 'ENTER' key 90
Figure 6.62 LCD Screen with Fifth Row Content 91
Figure 6.63 Setup value change confirmation screen 91
Figure 6.64 Notifying change is completed 91
Figure 6.65 Notifying change is cancelled 91
Figure 6.66 Lock setup initial screen 92
Figure 6.67 Motor Start Protect Element setup Initial Screen 93
Figure 6.68 Low current protection element setup initial screen 94
Figure 6.69 OVGR setup initial screen 95
Figure 6.70 Definite time OVGR setup screen 95
Figure 6.71 Status where the partial cursor appears for change 96
Figure 6.72 Status in which ‘ENTER‘ key was pressed after changing setup items 96
Figure 6.73 Setup value change confirmation screen 97
Figure 6.74 Notifying change is completed 97
Figure 6.75 Notifying change is cancelled 97
Figure 6.76 Instantaneous time OVGR setup screen 97
Figure 6.77 SGR setup initial screen 98
Figure 6.78 Definite time SGR setup screen 99
Figure 6.79 Status where the partial cursor appears for change 100
Figure 6.80 Status in which ‘ENTER’ key was pressed after changing setup items 100
Figure 6.81 Setup value change confirmation screen 100
Figure 6.82 Notifying change is completed 100
Figure 6.83 Notifying change is cancelled 101
Figure 6.84 Event record initial screen 101
Figure 6.85 A screen numbered one lower than the current event record number 102
Figure 6.86 The screen after the ‘ENTER’ key is pressed in the event record 102
Trang 14Contents Accura 7500 Guide
Figure 6.87 The screen while ‘’ key is pressed in the event record screen 102
Figure 7.1 Status initial screen 103
Figure 7.2 Voltage display screen 104
Figure 7.3 Current display screen 104
Figure 7.4 DI status display screen 105
Figure 7.5 DO status display screen 105
Figure 7.6 Event record information display screen 106
Figure 7.7 CB Counter display screen 106
Figure 7.8 Program version display screen 107
Figure 8.1 Setup initial screen 108
Figure 8.2 Passcode setup screen 109
Figure 8.3 Passcode change confirmation partial cursor 109
Figure 8.4 Current passcode entering screen and the partial cursor 109
Figure 8.5 Passcode mismatch message screen 110
Figure 8.6 ‘Passcode Change Completed!’ message screen 110
Figure 8.7 Record deletion menu screen 111
Figure 8.8 Status in which reset can be done 111
Figure 8.9 Status where ‘ENTER’ key is pressed after selecting the item to be deleted 112
Figure 8.10 Setting value change confirmation screen (Confirm deletion of record) 112
Figure 8.11 Notifying change is completed 112
Figure 8.12 Notifying change is cancelled 112
Figure 8.13 DIN Setup screen 113
Figure 8.14 Status where change can be done with the partial cursor 114
Figure 8.15 Status in which ‘ENTER’ key was pressed after changing setup items 115
Figure 8.16 Setup value change confirmation screen 115
Figure 8.17 Notifying change is completed 115
Figure 8.18 Notifying change is cancelled 115
Figure 8.19 DO Setup screen 116
Figure 8.20 Status where the partial cursor appears for change 117
Figure 8.21 Status in which ‘ENTER’ key was pressed after changing setup items 118
Figure 8.22 Setup value change confirmation screen 118
Figure 8.23 Notifying change is completed 118
Figure 8.24 Notifying change is cancelled 118
Figure 8.25 DO with Relay setup screen 119
Trang 15Accura 7500 Guide Contents
Figure 8.30 Notifying change is cancelled 121
Figure 8.31 DO control menu screen 122
Figure 8.32 Status where the partial cursor appears for change 123
Figure 8.33 Status were ‘ENTER’ key was pressed after control item change 123
Figure 8.34 LCD setup screen 124
Figure 8.35 Status where the partial cursor appears for change 124
Figure 8.36 Status in which ‘ENTER’ key was pressed after changing setup items 125
Figure 8.37 Setup value change confirmation screen 125
Figure 8.38 Notifying change is completed 125
Figure 8.39 Notifying change is cancelled 125
Figure 8.40 PT Failure function setup screen 126
Figure 8.41 Status where the partial cursor appears for change 127
Figure 8.42 Status in which ‘ENTER’ key was pressed after changing setup items 127
Figure 8.43 Setup value change confirmation screen 127
Figure 8.44 Notifying change is completed 127
Figure 8.45 Notifying change is cancelled 128
Figure 8.46 CB Failure setup screen 129
Figure 8.47 Status where the partial cursor appears for change 130
Figure 8.48 Status in which ‘ENTER’ key was pressed after changing setup items 130
Figure 8.49 Setup value change confirmation screen 130
Figure 8.50 Notifying change is completed 131
Figure 8.51 Notifying change is cancelled 131
Figure 8.52 Protection blocking function setup screen 132
Figure 8.53 Status where the partial cursor appears for change 133
Figure 8.54 Status in which ‘ENTER’ key was pressed after changing setup items 133
Figure 8.55 Setup value change confirmation screen 134
Figure 8.56 Notifying change is completed 134
Figure 8.57 Notifying change is cancelled 134
Figure 8.58 Date Setup screen 135
Figure 8.59 Status where the partial cursor appears for change 136
Figure 8.60 Status in which ‘ENTER’ key was pressed after changing setup items 136
Figure 8.61 Setup screen for DO related with DI 137
Figure 8.62 Status where the partial cursor appears for change 138
Figure 8.63 Status in which ‘ENTER’ key was pressed after changing setup items 138
Figure 8.64 Setup value change confirmation screen 139
Figure 8.65 Notifying change is completed 139
Figure 8.66 Notifying change is cancelled 139
Figure 9.1 IEC Curve A 143
Trang 16Contents Accura 7500 Guide
Figure 9.2 IEC Curve B 145
Figure 9.3 IEC Curve C 147
Figure 9.4 IEC Curve LI 149
Figure 9.5 KEPCO Normal Inverse 151
Figure 9.6 KEPCO Very Inverse 153
Figure 9.7 SGR operation characteristic 154
Figure 9.8 THR Thermal Curve 156
Figure 10.1 UVR setup initial screen 163
Figure 10.2 Definite time UVR setup screen 163
Figure 10.3 DIN setup screen 164
Figure 10.4 Setup screen for Power recovery CB input channel 164
Trang 17Accura 7500 User Guide Chapter 1 Introduction
Chapter 1 Introduction
Overview
Specialized functions for essential relay elements
Accura 7500 performs general feeder and motor protection of high-voltage consumers, and easy operation and setup of equipment by using operation key grouped by relay element
Convenient structure with the meter separated from the relay
Accura 7500 has a power meter function completely separated from the protection relay both structurally and
by design As the meter function is placed on the left-hand side of the front of the relay and the protection relay function is placed on the right-hand side of the front of the relay, these are precluded any human concern by having separate operating keys
Measurement accuracy and power quality
Accura 7500’s meter function can perform 0.2% high-accuracy measurement for voltage and current, and the power/energy meets the IEC 62053-22 Class 0.5S specification, providing accurate power measurement information In addition, it provides power quality information including voltage/current THD, harmonics analysis and k factor
Trang 18Chapter 1 Introduction Accura 7500 User Guide
Features
Protection relay
27, 37, 46, 47, 48, 50, 51, 50G, 51G, 51LR, 59, 64G, 67G
Measurement accuracy: Full scale ± 1.0%[100V, 5A]
Timing Accuracy: within ± 5.0% or ± 35ms
Protection relay based on filtered fundamental component in voltage and current inputs
32 sampling/cycle
Real-time protection per every sampling
Event time analysis resolution: 1msec
Phase voltage(Phase-to-neutral voltage), line-to-line voltage(Phase-to-Phase voltage), current
Power, energy, power factor, frequency
Fundamental and True RMS measurement of current
Quadrature power
Demand measurement, Peak demand
Maximum value, minimum value
Trang 19Accura 7500 User Guide Chapter 1 Introduction
Application
For high voltage consumer only
Accura 7500 performs general feeder and motor protection for high-voltage consumers
A power meter in a relay device
Accura 7500 completely separates the power meter function included in the relay from the protection relay from design and construction The meter function is placed on the left-hand side of the front of the relay and the protection relay is on the right-hand side, with their functions separated for convenience of operation This removes the burden on the user of human error when operating a product that has meter and relay functions not functionally separated
High-accuracy power measurement
For higher accuracy in measurement, Accura 7500 uses a separate measurement CT for power measurement, apart from the CT for the relay This resolves the problem of degradation of measurement accuracy when one
CT is shared by the relay and the measurement module
True RMS measurement robust to harmonics
Today’s power usage environments are composed of nonlinear loads-industrial loads, rectifiers, power electronic devices, electric furnaces, and so on that induce harmonics This causes severe distortion due to harmonics in the voltage and current waveforms Accura 7500 performs accurate True RMS measurement for voltage and current waves distorted by harmonics
Power quality analysis
Accura 7500 can analyze 2nd to 31th harmonics as well as harmonic distortion factors of voltage and current, and provides K factors
Electrical energy management with high reliability
Electrical energy managenet, in conjunction with higher-level programs, is specified by various application services such as monitoring, cost management, power demand management, power equipment replacement and electrical energy planning Here, the most important factor determining the data reliability of electrical energy management is the accuracy of measurement data Accura 7500 provides 0.2% high-accuracy measurement of voltage and current, and the power/energy meets the IEC62053-22 Class 0.5S specification, enabling the implementation of an accurate electrical energy management system
Trang 20Chapter 2 Specification Accura 7500 User Guide
Chapter 2 Technical Specification
Operation setting range 0.5 ~ 12.00A by the step of 0.01A
Operating time setting range 0.05 ~1.20 by the step of 0.01 (level: time multiplier)
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve IEC(A, B, C, LI), KEPCO(NI, VI)
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Overcurrent relay Instantaneous time OCR(50P)
Current Fundamental component of phase current (harmonics and DC offset removal)
Operation setting range 1.00 ~ 99.99A by the step of 0.01A
Operating time setting range 0.05 ~ 60.00 s by the step of 0.01 s, 0.05s: Instantaneous time operation
More than 0.05s: Definite time operation Reset level 97% of pickup level
Operation setting range 0.5 ~ 4.00A by the step of 0.01A
Operating time setting range 0.05 ~ 1.20 by the step of 0.01 (level: time multiplier)
Reset level 97% of pickup level
Trang 21Accura 7500 User Guide Chapter 2 Specification
Negative sequence overcurrent relay instantaneous time NSOCR(46I)
Current Negative sequence current of 3 phase current (harmonics and DC offset removal)
Operation setting range 0.10 ~ 50.00A by the step of 0.01A
Operating time setting range 0.05 ~ 60.00s by the step of 0.01 s, 0.05s: Instantaneous time operation
More than 0.05s: Definite time operation Reset level 97% of pickup level
Operation setting range 0.10 ~ 2.50A by the step of 0.01A
Operating time setting range 0.05 ~ 1.20 by the step of 0.01 (level: time multiplier)
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve IEC(A, B, C), KEPCO(NI, VI) : 2 OCGR inverse time elements can be set
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Overcurrent ground relay definite time OCGR(51G)
Current Fundamental component of ground current (harmonics and DC offset removal)
Operation setting range 0.10 ~ 2.50A by the step of 0.01A
Operating time setting range 0.05 ~ 60.00 s by the step of 0.01 s
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Overcurrent ground relay instantaneous time OCGR(50G)
Trang 22Chapter 2 Specification Accura 7500 User Guide
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation time accuracy Within 50msec
Overvoltage relay definite time and instantaneous time OVR(59P)
Voltage Fundamental component of phase voltage or phase-to-phase voltage (harmonics
and DC offset removal) Rated voltage 110V, 63.5V
Operation setting range 60 ~ 270V by the step of 1V
Operating time setting range
(Definite time)
0.05 ~ 60.00 s by the step of 0.01 s
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve Definite time, instantaneous
Operation time accuracy (Definite
Voltage Fundamental component of negative sequence voltage calculated by 3 phase
voltage (harmonics and DC offset removal) Rated voltage 110V, 63.5V
Operation setting range 5 ~ 110V by the step of 1V
Operating time setting range
(Definite time)
0.05 ~ 60.00 s by the step of 0.01 s
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve Definite time
Operation time accuracy (Definite
Voltage Fundamental component of phase voltage or phase-to-phase voltage (harmonics
and DC offset removal)
Trang 23Accura 7500 User Guide Chapter 2 Specification
Operating time setting range 0.05 ~ 60.00 s by the step of 0.01 s
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Under-voltage relay definite time and instantaneous time UVR(27P)
Voltage Fundamental component of phase voltage(neutral voltage) or
phase-to-phase voltage (harmonics and DC offset removal) Rated voltage 110V, 63.5V
Operation setting range 20 ~ 220V by the step of 1V
Operating time setting range
Operation condition OR (under voltage on one or more phases), AND (under voltage on all 3-phases)
CB OFF (operation regardless of CB status), CB ON (only when CB status is ON) Reset level 103% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve Definite time, Instantaneous time : 3 UVR elememts for various settings
Operation time accuracy (Definite
Rated motor[Im] 0.50 ~ 15.00A by the step of 0.01A
k constant 1.00 ~ 1.50 by the step of 0.01
Time Tau (Heat Rise Time) 1 ~ 60min by the step of 1min
Previous Load Current: Ip Under F/W Ver 5.06 : 0.00 ~ 1.00 x Im by the step of 0.01
From F/W Ver 5.07 : No Setting Automatically calculate and reflect driving history
Reset method Definite time
Cooling TC(Running) 1 ~ 6,000s by the step of 1s
Cooling TC(Stopped) 1 ~ 6,000s by the step of 1s
Reset level 97% of pickup level
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Trang 24Chapter 2 Specification Accura 7500 User Guide
Motor overload inverse time LOCK(51LR)
Current Fundamental component of phase current (harmonics and DC offset removal)
Rated motor[Im] 0.50 ~ 10.00A by the step of 0.01A
Operation setting range 1.00 ~ 20.00 x Im by the step of 0.01
Operating time setting range 0.05 ~ 60.00 s by the step of 0.01s
Reset Time Instantaneous time
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Motor starting protection overcurrent(48, 51S)
Current Fundamental component of phase current (harmonics and DC offset removal)
Rated motor[Im] 0.50 ~ 10.00A by the step of 0.01A
Accepted starting current[Tab] setting
range
1.00 ~ 20.00 x Im by the step of 0.01
Accepted starting time setting range 0.1 ~ 600.0s by the step of 0.1s
Start detection current setting range 0.10 ~ 0.80 x Tab by the step of 0.01
51L Interlock Selects whether to 51L Interlock in start interval
51G, 50G Interlock Selects whether to 51G and 50G Interlock in initial start interval
Reset level 97% of pickup level
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
Under-current definite time UCR(37)
Voltage Fundamental component of phase current (harmonics and DC offset removal)
Operation setting range 0.10 ~ 5.00A by the step of 0.01A
Operating time setting range 0.1 ~ 600.0 s by the step of 0.1s
Motor running status detection
method selection
CB On status or starting condition of relay element 48
Reset level 97% of pickup level
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Overvoltage ground definite time and instantaneous time OVGR(64G)
Voltage Fundamental component of zero-sequence voltage
Operation setting range 10 ~110V by the step of 1V
Operating time setting range
(definite time)
0.05 ~ 60.00 s by the step of 0.01 s
Reset level 97% of pickup level
Measurement accuracy 1.0% (F.S)
Operation characteristic curve Definite time, instantaneous time
Operation time accuracy (Definite
Operation setting range 0.2 ~ 10.0 mA by the step of 0.1 mA
Reference voltage setting range 10 ~ 110V by the step of 1V
Reference phase-angle setting range 0°~ 359° by the step of 1°
The phase-angle setting can be set only in 2 SGR, and there is no phase-angle setting in GR
Operating time setting range 0.05 ~ 60.00 s by the step of 0.01 s
Reference voltage Fundamental component of zero-sequence voltage (harmonics and DC offset
removal) Reset level 97% of pickup level
Phase-angle accuracy 2°
Operation time accuracy The greater value between ± 5% of setting operation time and 35ms at over 1.05
times of pickup level
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Measurement
Measurement elements
Trang 27Accura 7500 User Guide Chapter 2 Specification
Measurement Test
IEC62053-22, Electricity Meter Equipment: active energy for Class 0.5S
Current range Power factor Class 0.2S/ 0.5S Accura 7500
voltage Phase-to-Neutral 0.0 ~ 9999V, kV ± 0.2% Reading
Phase-to-Phase 0.0 ~ 9999V, kV ± 0.2% Reading
Power Active 0.000 ~ ± 9999kW, MW IEC62053-22 Class 0.5S
Reactive 0.000 ~ ± 9999kVar, MVar ± 0.5% Reading Apparent 0.000 ~ 9999kVA, MVA ± 0.5% Reading Energy Active 0 ~ ± 999,999,999kWh IEC62053-22 Class 0.5S
Reactive 0 ~ ± 999,999,999kVarh ± 0.5% Reading Apparent 0 ~ 999,999,999kVAh ± 0.5% Reading
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1 Voltage: 220V 50% harmonics analysis capability / current: 5A 50% harmonics analysis capability
Protection relay accuracy
Measurement accuracy: ±1.0% Full Scale[110V, 5A]
Operation time accuracy: within ±5.0% or ±35ms
Reliability Test
KEMC1120, IEC60225-22, IEC61000-4
KEMC 1120 Digital-type protection relay Performance, structure, various
characteristic
Good
IEC60255-22-1 1MHz Burst Disturbance Test 2.5kV/1kV common/differential 2.5kV / 2.5kV IEC60255-22-2 Electrostatic Discharge(ESD) Test 6kV/8kV, contactor/air 20kV/20kV IEC60255-22-3 Radiated Electromagnetic Field
IEC60255-22-5 Surge Immunity Test 1kV/2kV, line to line / line to earth 4kV/4kV
IEC60255-22-6 Immunity to conducted disturbance
induced by radio frequency fields
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Control
DI related functions
It is a control function that works in relation to a set digital input status
Alarm reset Stops the bell sound connected to the alarm terminal by reset the alarm output This function
eliminates the need for a separate sequence for stopping outside bell sounds
Fault reset The fault status is reset if input is applied to the set digital channel when the protection relay
has faulted It’s the same effect as the “Fault Reset” key on the front panel It’s necessary when installing a separate reset switch on the switchboard or when using a remote switch
Chagne to remote
mode
Accura 7500 is operated in a remote mode and the mode is kept regardless of the operations
of [Remote] and [Local] keys on the front panel
Notification of the load
Closing of a circuit breaker via the front panel [CB ON] key and communication is suppressed
if input is applied to the set digital channel
CB OFF output The circuit breaker(CB) is turned off(opend) by the CB OFF output if input is applied to the set
digital channel
Alarm output Alarm is sounded by the alarm output if input is applied to the set digital channel
UVR reset Resets UVR related to the corresponding input channel status
Protection limit operation time 0.1 to 60.0 s by the step of 0.1 s
Settable relay elements OCR, OCGR
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Input & Output
Number of channel CB status input 1 channel + 10 channel
Type Wet contactors: external DC voltage only
Rating DC 70V - DC125V (for ripple ratio of under 30%)
Real time clock
Accuracy Typical ± 60 seconds per month
Backup energy More than 10 years
Digital output
Channel CB CLOSE, CB OPEN, Alarm + 10 channel
Rating (CB CLOSE, OPEN) AC250V 25A / DC 30V 15A resistive load
4000 VA, 480W Rating (Alarm, Auxiliary contactor) AC250V 5A / DC 30V 5A resistive load
1250 VA, 150W
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value, Fault Record
LED display
Display elements meter: various selection display
relay: POWER, Communication, Error, Trip information, Remote, Local, CB ON,
CB OFF, Fault and operation status, function key selection display
Control key
Type meter: MENU, ↑, ↓, ENTER
relay: CB ON, CB OFF, Remote, Local ENTER, ESC,↑,↓
relay selection key x 7 Fault Reset, Record, Status, Setup
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Others
Event record
Number of records 600 event records saving
Time display Displays up to ms based on the internal RTC
Trigger Pickup, Trip, Dropout of the protection relay and change of the digital input status
Display data Last event record number, event type, fault phase, time, saving of various measured
IEC60255-22-1: 1MHz Burst Disturbance
IEC60255-22-2: Electrostatic Discharge[ESD]
IEC60255-22-3: Radiated Electromagnetic Field Disturbance
IEC60255-22-4: Electrical Fast Transient/ Burst Immunity
IEC60255-22-5: Surge Immunity
IEC60255-22-6: Conducted RF Immunity
IEC61000-4-8: Rated Power Frequency Magnetic Field
IEC61000-4-12: Voltage Dip/Short Interruptions
Trang 33Accura 7500 User Guide Chapter 3 Product Installataion
Chapter 3 Product Installation
Accura 7500 should be installed in a switchboard cabinet or similar enclosure in order to block user access
to its terminal after installing the product
Accura 7500 should be installed at locations where there are no pollutants such as dust, oil and corrosive gases Once installed, it is recommanded that no separate cleaning process is required and that it is not exposed to external environment
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Dimension
Figure 3.1 Accura 7500 front
Figure 3.2 Accura 7500 rear
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Figure 3.3 Accura 7500 side
Trang 36Chapter 3 Product Installataion Accura 7500 User Guide
Step 1: Panel Mounting
Accura 7500 has a front panel draw-out type structure as Figure 3.4 The unit (the internal part excluding the chassis of the Accura 7500 is called “unit” hereafter) and chassis are separated, and when the unit is detached, a terminal that automatically short-circuits the CT is attached to the chassis
There are no other components on the chassis other than the terminals Although it’s a front panel draw-out type structure, the unit and the chassis are attached together at the time of the product delivery So the Accura
7500 can be assembled with the panel as shown in Figure 3.5 Figure 3.6 is a panel cutout drawing
Figure 3.4 Assembly structure
Figure 3.5 Panel assembly method
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Accura 7500 User Guide Chapter 3 Product Installataion
Figure 3.6 Panel cutting
Detachment and assembly of the unit for repair
In order to pull out the unit from the chassis, first push aside the left and right handles of the front panel, pull them and erect them toward the front Then, release the four bolts combining the unit and chassis together at the rear of the handle as in Figure 3.7 and pull the handles to the front
Figure 3.7 Detachment of the unit from the chassis
Reversely, in order to assemble the unit back into the chassis, push the unit along the guides on the upper and lower parts of the inside of the chassis and apply sufficient pressure on the front panel so that the front panel
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is closely attached to the panel Fasten the unit to the chassis with four bolts and push-shut the handles
Note After assembling the unit with the chassis, press the chassis rear panel terminal bases toward the front panel
If they are not pressed any more, then it means the unit and the chassis are completely fastened together Incomplete combination can cause inaccurate detection of current or problems in the digital input and output functions
Step 2: External Wiring
Unlike general multi-function relay, Accura 7500 contains a metering CT and a protection CT for accurate measurement, extra special caution is required in CT wiring
Note Each of Protective Earth (PE) and Frame Ground (FG) must be one-point-earthed to the switchboard
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 contactor of Accura 7500 may deteriorate and burn out
Trang 39Accura 7500 User Guide Chapter 3 Product Installataion
Wiring diagram example (3P4W 3PTs, 3CTs)
Figure 3.8 Wiring diagram(3P4W 3PTs, 3CTs)
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Wiring diagram example (3P3W 3PTs, 3CTs)
Figure 3.9 Wiring diagram (3P3W 3PTs, 3CTs)