Related Manuals for Bender NGR-2GFP
Summary of Contents for Bender NGR-2GFP
- Page 1 Neutral Grounding Resistor with Second Ground Fault Protection NGR-2GFP User Manual...
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Page 2: Table Of Contents
Table of Contents Preface ................................. 4 General safety instructions ................................... 4 Laws and guidelines ....................................5 Target group and required knowledge............................. 5 Product description ............................... 5 Receiving, unpacking, and inspection ........................6 Grounding and bonding ............................7 Physical installation .............................. 7 Suitable locations ..................................... - Page 3 Neutral Overvoltage Condition ........................25 Resistor Failure Condition ........................... 25 Phase Undervoltage Condition ........................25 Coordination ............................... 25 Logic Diagrams ..............................27 NGR-2GFP Units ..............................29 RCMS490 and NGRM settings ........................... 29 Form Factors ..............................31 Integrated System ....................................31 Components ..............................31 Item numbers ...............................
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Page 4: Preface
Touchscreen Display ................................... 46 Handheld Pulse Detector (Optional) .............................. 47 Portable Ground Fault Location System (Optional) ........................ 47 Application Examples ............................48 One Substation, Single Source, Single Bar ..........................48 One Substation, Multiple Sources, Single Bus Bar with Zig-Zag ..................50 One Substation, Two Sources, Two Bars ........................... -
Page 5: Laws And Guidelines
Capability to operate and test application of product Product description The purpose of a Neutral Grounding Resistor with Second Ground Fault Protection (NGR-2GFP) is to increase the safety of an industrial or commercial electrical distribution system while maximizing continuity of service. -
Page 6: Receiving, Unpacking, And Inspection
Portable Ground Fault Location System Depending on the requirements of the particular installation, an NGR-2GFP can be supplied in different form factors: as an Integrated System (With all the components except the Feeder Ground Current Transformers in a single enclosure), as a Separated System (With the resistor in a separate enclosure), as an Rack System (plug-in module rack system with a separate resistor), as a Plate System (Back Plate and Front Plate combination with a separate resistor), or as Loose Components. -
Page 7: Grounding And Bonding
Grounding and bonding Follow relevant electrical codes to adequately ground and bond the product. Refer to the product drawing for bonding points on metallic enclosures, typically available as compression lugs or bolts. There may be multiple grounding points within enclosures, typically accessible as grounding bars (i.e. NEMA pads) or terminal blocks. -
Page 8: Operation
Operation An NGR-2GFP can be specified and configured for protection of multiples of 12 feeders up to a maximum of 120, considering up to six substations with different system configurations or bus arrangements. System configuration, monitoring and operation is accessible with the Touchscreen Operator Panel. -
Page 9: Initial Screen
If required, auxiliary normally open contacts 250VAC, 5A are used for Tie circuit breaker permissive closing command. Initial Screen The initial screen shows current and voltage in the neutral grounding resistor: Figure 1 Initial Screen Home Screen Pressing the HOME button (top right corner of the initial screen) takes the operator to the HOME screen. Figure 2 Home Screen The HOME screen provides access to the different screens required for configuration/operation and system overall information using colored targets arranged in table format. - Page 10 Jumping to other screens is done through the following pushbuttons: 1. FEEDER CONFIGURATION (Priority, Topology, Feeder Identification) 2. TARGETS (Protection targets and ground fault current values) 3. ALARMS (Configured alarms in the system) 4. SLD (Single line diagram) 5. PERFORM (System performance, power grid configuration) 6.
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Page 11: Feeder Configuration Screen
Feeder Configuration Screen Feeder Configuration screen allows assigning priorities from 1 (Highest) to 99 (Lowest) to each feeder which may trip simultaneously or sequentially if involved in a second ground fault. Different feeders may have the same priority without restrictions, in which case the tripping will occur in sequential order until the second fault has been cleared. -
Page 12: Target Screen
Target Screen This screen shows the following information: 1. Feeder ground current 2. Feeder first fault condition (latched indication) 3. Feeder second fault operation (latched indication) 4. Feeder trip (latched indication) The background colors for feeder ground current are: 1. Green: normal condition 2. -
Page 13: Alarms Screen
Alarms Screen Any active alarm, acknowledged or not, will be shown on this screen. If the alarm is no longer active, it will be cleared from the alarm list as soon as it is acknowledged. Figure 5 Alarms Screen Double Check (or Double Tick) symbol acknowledges all active alarms, the message going from blinking colors to steady color (red). - Page 14 Alarm Contact 1 released First Fault Occurred Alarm Contact 2 released Second Fault Occurred Bender Comm Fails Comm fails between Gateway and RCMS490 or NGRM CT Open Feeder 1 Requires setting in RCMS490: Enable CT Monitoring CT Open Feeder 2...
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Page 15: Sld (Single Line Diagram) Screen
Ground Current Warning Feeder 7 RCMS490 ground current 7 > warning setpoint Ground Current Warning Feeder 8 RCMS490 ground current 8 > warning setpoint Ground Current Warning Feeder 9 RCMS490 ground current 9 > warning setpoint Ground Current Warning Feeder 10 RCMS490 ground current 10 >... -
Page 16: System Screen
System Screen Use the SYSTEM screen to: Review: 1. Maximum (since energized) and most recent PLC scan time in microseconds. 2. Controller number of errors. 3. HMI status Configure: 1. Number of substations (from 1 to 6) 2. Total number of feeders (12 up to 120) 3. -
Page 17: Help Screens
Figure 8 Password Screen 2. If HMI (Operator Panel) configuration parameters should be modified, power cycle the unit, interrupt the boot up process and enter either one of the following passwords: +-+- abc123 HMI menus will be accessible for making the required changes. Help Screens Useful screens for helping in system configuration, operation and communications Figure 9 Configuration help Screen... -
Page 18: Trendings Screens
Figure 10 Operation help Screen Figure 11 Bender Communicatio help Screen Trendings Screens All parameters in these screens are completely configurable by user according to their needs... -
Page 19: Substation Screens
Figure 12 Trending Screen Figure 13 Historical Trending Screen Substation Screens SUBSTATIONS screens are accessed from the HOME screen and are used to: 1. Configure: a. Power distribution network topology (password required) b. Substation bus bar topology (password required) 2. Monitor: a. -
Page 20: Power System Configuration
Power System Configuration For radial Power Systems there are two types of substations: 1. Main Substation: Connected directly to Utility or Auxiliary Generator. These substations may have one, two or three bus bars, each bus bar with its own NGR. 2. -
Page 21: Example 2: One Substation (Main) With Two Bus Bars
Figure 14 Example 1 Example 2: One substation (Main) with two bus bars Figure 15 Example 2 When the Tie circuit breaker is closed, two important considerations apply: 1. For Generators or Transformers operating in parallel, proper interlocking must be provided between CB1, CB2 and Tie1. -
Page 22: Example 3: One Substation (Main) With Three Bus Bars
Example 3: One substation (Main) with three bus bars This is a typical configuration used when an auxiliary generator is connected to Bus 2, providing power to bus 1 or bus 3 in case of need. Proper interlocking is required. Figure 16 Example 3 Same screen, not including Phase Voltage Monitoring: Figure 17 Example 3... - Page 23 Figure 18 Example 4 Figure 19 Example 4...
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Page 24: System Conditions
Figure 20 Example 4 System Conditions Ground Current Alarm Condition If any feeder ground current exceeds the alarm threshold configured in the HMI SYSTEM screen: 1. Ground Fault (Red) lamp on the front door will start blinking. 2. General Alarm relay will de-energize. 3. -
Page 25: Neutral Overvoltage Condition
2. Feeders with lowest priorities will trip, while the faulted feeder(s) with the highest priority will remain on service, still at fault, returning the System to First Ground Fault Condition. 3. Ground Fault (Red) lamp on the front door will turn steady ON. 4. - Page 26 Figure 21 Coordination...
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Page 27: Logic Diagrams
Logic Diagrams The main processes are shown below: Alarm Start No Any alarm from PLC, CT open/short condition or Communication Alarm Yes HMI Alarming condition Auxiliary contact #0 opens End Figure 22 Alarm Condition Figure 23 First Fault... - Page 28 Second Fault Start LOGIC CONTROLLER Monitors number of RCMS490 operated channels Wrong RCMS490 settings or <1 =1 Another fault, not supervised, is occurring. Number of IF NGRM is also operated, Operations PLC will trip the only one faulted Feeder >1 LOGIC CONTROLLER identifies faulted End Substation, bus and feeders. LOGIC CONTROLLER selects the Feeder(s) with lowest priority In the faulted zone If more than one feeder with lowest priority is found, LOGIC CONTROLLER will select the one configured in first place LOGIC CONTROLLER trips selected Feeder HMI Alarming condition auxiliary contact #2 changes over Figure 22 Second Fault End ...
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Page 29: Ngr-2Gfp Units
NGR-2GFP units. An NGR-2GFP Unit can be Standalone, Server or Remote. Server Units can control additional Remote Units to simplify maintenance and operation by having all the information concentrated in one central control point. - Page 30 Figure 235 NGR-2GFP Server and Remote Units...
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Page 31: Form Factors
Recommended for end users, system integrators and electrical-house manufacturers. Easy to order, ship, install and maintain. Only available for low voltage systems. For medium voltage systems an NGR-2GFP Separated System is required. Figure 246 Integrated System HR4 Enclosure Components All standard units provide Second Ground Fault Protection, AC/DC Alarm, Communications, Harmonic Filtering, Pulsing System and Resistor Monitoring. -
Page 32: Item Numbers
• REHR Neutral Resistor with Pulsing Resistor • CD1000 Coupling Device • NGRM700 or NGRM500 Neutral Ground Fault and Resistor Monitor • CTUB103-CTBC35 Neutral Current Transformer • RCMS490 Feeder Ground Fault Current Monitor • ELCO-L12 Standalone System Controller 12 Feeders ILC 131 ETH System Controller •... -
Page 33: Separated System
5 Amps 140055 140058 140061 140064 140067 140070 347 Volts 10 Amps 140056 140059 140062 140065 140068 140071 1-5 Amps 140057 140060 140063 140066 140069 140072 Does not include phase voltage monitoring. Call factory for other ratings and additional required features. Separated System Comes in two or more enclosures: One or more with the Resistive Elements, Coupling Device(s) and Neutral Current Transformer(s) and one or more one with the other components. - Page 34 Figure 26 Separated System, N2 Low Voltage Resistor Enclosures Figure 278 Separated System, N9A Medium Voltage Enclosure The main components included in the standard HR3 control enclosure are: • NGRM700 or NGRM500 Neutral Ground Fault and Resistor Monitor • RCMS490 Feeder Ground Fault Current Monitor •...
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Page 35: Item Numbers
The main components included in the standard medium voltage resistor N9A enclosure are: • REMV Neutral Resistor with Pulsing Resistor • CD5000 Coupling Device • CTUB103-CTBC35 Neutral Current Transformer When a Zig-zag transformer is required it is installed in the bottom compartment of a double N9A enclosure. Other available components include: •... -
Page 36: Rack System
12 AC 6 AC + 12 AC/DC 12 AC 6 AC + 12 AC/DC 6 AC/DC 6 AC/DC 5 Amps 140145 140148 140151 140154 140157 140160 277 Volts 10 Amps 140146 140149 140152 140155 140158 140161 1-5 Amps 140147 140150 140153 140156 140159... -
Page 37: Item Numbers
• Load-break Switch • Disconnect Switch • Grounding Transformer • Handheld Pulse Detector • Portable Ground Fault Location System Item numbers For systems with available neutral: Voltage Current With NGRM700 With NGRM500 Item number by number of feeders Item number by number of feeders 12 AC 6 AC + 12 AC/DC... - Page 38 DC to 1.9 kHz. 2) Leave existing TXA* current transformers installed and add a Bender W or CTAC current transformer cascaded with five primary turns from the TXA-secondary terminals to provide the correct ratio for the RCMS relay.
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Page 39: Plate System
For cascading, Bender W or CTAC current transformers including models W1-S35, W0-S20, CTAC20 and CTAC35 can be used. Existing cables connecting TXA current transformers to DSP / DSA systems can be used to connect W or CTAC current transformers. Cascade current transformers can be installed beside the existing T sensors, to allow monitoring of the connection cables for open or short circuit, or beside the Rack System in the control enclosure. - Page 40 Figure 31 Plate System, Front Plate Figure 32 Plate System, Back Plate The main components included in the back plate are: • NGRM700 Neutral Ground Fault and Resistor Monitor • RCMS490 Feeder Ground Fault Current Monitor • ELCO-L12 Standalone System Controller 12 Feeders •...
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Page 41: Item Numbers
• Feeder Ground Fault Current Transformers (One required for each feeder) • Load-break Switch • Zig-zag transformer (Required when the system neutral is not available) • Disconnect Switch • Grounding Transformer • Handheld Pulse Detector • Portable Ground Fault Location System When a Zig-zag transformer is required it is installed in the bottom compartment of a double N9A enclosure. -
Page 42: Loose Components System
Voltage Current With NGRM700 With NGRM500 Item number by number of feeders Item number by number of feeders 12 AC 6 AC + 12 AC/DC 12 AC 6 AC + 12 AC/DC 6 AC/DC 6 AC/DC 5 Amps 140433 140436 140439 140442 140445... -
Page 43: Main Components
Main Components Resistive Elements Used to limit the ground fault current to a safe value while at the same time letting enough current flow to operate the protective relays that will alarm or clear the fault. While the disturbance lasts the resistor must be capable of absorbing and dissipating the energy generated without exceeding the temperature limits established by international standards. -
Page 44: Neutral Current Transformers
Monitoring is required. Figure 33 W Series Feeder Ground Current Transformers One Bender current transformer series W, WR, CTAC or CTUBC is required per feeder. A series CTUB102-CTBC with the corresponding 24V power supply must be used if AC/DC Ground Fault Monitoring is Figure 35 WR Series required. -
Page 45: Feeder Ground Fault Current Monitor
CTUB102-CTBC210 210 mm Feeder Ground Fault Current Monitor The Bender RCMS490 relay is a residual current monitor for twelve channels providing values, alarms and tripping functions. Its main features include: 1. Twelve measuring current channels, from 6mA to 20A 2. Option to measure true RMS value, or filtered 50Hz or 60Hz 3. -
Page 46: System Controller
Its main features include: 1. RCMS490/RCMS460 relays monitoring 2. Modbus slave driver 3. Time synchronization for the BMS bus system 4. Diagnostics functions 5. Password-protected device menu Figure 38 COM465 IT System Controller Used for second ground fault protection logic, pulsing, interlocking, HMI and SCADA functionalities. Main features: 1. -
Page 47: Handheld Pulse Detector (Optional)
Handheld Pulse Detector (Optional) Used to trace the pulse waveform generated by the Resistor Unit to locate phase-to-ground faults while the system remains in operation. Main features: 1. Analog Ammeter 2. Multi-range switch 3. Shorting switch 4. Carrying case 5. Low voltage models*: HPD6 (6”-152mm window) and HPD9 (9”-229mm window) 6. -
Page 48: Application Examples
Application Examples Second Ground Fault Protection Systems can be used in industrial power distribution systems with different bus arrangements. One Substation, Single Source, Single Bar A basic configuration using a Separated NGR-2GFP unit. Figure 42 One Station, Single Source, Single Bar... - Page 49 The corresponding schematic is: Figure 43 One Station, Single source, Single Bar, Schematic...
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Page 50: One Substation, Multiple Sources, Single Bus Bar With Zig-Zag
One Substation, Multiple Sources, Single Bus Bar with Zig-Zag The bus is grounded using a zig-zag transformer to create an artificial neutral point. Figure 44 One Substation, Multiple Sources, Single Bus Bar with Zig-zag... -
Page 51: One Substation, Two Sources, Two Bars
One Substation, Two Sources, Two Bars This case shows a substation involving two bus bars, using one controller Unit with Remote Unit. Figure 45 One Substation, Two Sources, Two Bars... -
Page 52: One Substation, Two Sources, Mains And Emergency
One Substation, Two Sources, Mains and Emergency The following example presents two sources, Mains and Emergency Generator, and grounded bus bar, using one Controller Unit and one Remote Unit. Figure 46 One Substation, Two Sources, Mains and Emergency... -
Page 53: Four Substations, Two Sources, Five Bars
Four Substations, Two Sources, Five Bars This example presents a radial topology with three downstream substations. Figure 47Four Substations, Two Sources, Five Bars... -
Page 54: Network Architecture
Network Architecture The following example shows the network architecture for the system shown in figure 52 (with Server unit): Figure 48 Network Architecture 1. Substation 1: Two bus bar 2. Substation 2: Downstream substation, one bus bar, no NGR, no Neutral relay 3. -
Page 55: Modbus Communication
Modbus Communication Standard Modbus TCP/IP and HTLM5 communication are provided by the NGRM700 or the NGRM500 relay and COM465IP gateway. Information related to Neutral and Feeder current and alarms can be obtained. Refer to their manuals for their implementation. For legacy systems, integration through MODBUS serial RS485 is available on request. Specifications 1. - Page 56 1. Activate test function on NGRM relay 2. The Touchscreen Operator Panel or the remote computer via Modbus or HTML5 will display ground fault and resistor fault conditions 3. Reset NGRM relay 4. Inject primary current in two Feeder Current Transformers 5.
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Page 57: Storage, Returns, And Warranty
Storage, returns, and warranty Warranty Bender is not responsible for products delivered in good condition to the courier that arrive damaged to the destination (unless otherwise stated) but we will help you make a claim to the courier if required. -
Page 58: Appendix A - Relay Manuals
Appendix A – Relay manuals NGRM500/550 NGRM700/750 RCMS460-490... -
Page 59: Notes
Notes:... - Page 60 USA • Exton, PA México • Ciudad de México 800.356.4266 +(55) 7916 2799 info@benderinc.com • www.benderinc.com info@bender.com.mx • www.bender.com.mx Canada • Missisauga, ON 800.243.2438 info@bender-ca.com • www.benderinc.com 14.53i.REV.0| 10.2.23...