4.6.5 current differential relay commissioning … current differential relay commissioning...

Installation and Commissioning

4.6.5 CURRENT DIFFERENTIAL RELAY COMMISSIONING PROCEDURE Please review the following important information on the GARD Current Differential Relay Module before beginning the commissioning procedure.

• If the Current Differential Relay module was purchased as part of the GARD8000 system, the Current Diff. Relay Protection Scheme logic consisting of edn, text files and Current Diff. Relay settings were already loaded into the GARD8000 system. However, if the Current Diff. Relay module was added into an existing GARD8000 system, new Current Diff. Logic and settings have to be uploaded into the GARD8000. All the necessary steps on how to upload a new Current Diff Relay logic are covered at the end of this Commissioning Procedure (sections 4.6.5.16 and 4.6.5.17).

• A hard copy and/or a CD of the GARD System Instruction Manual is provided with the

purchased system. The software version of the GARD Instruction Manual can be downloaded from the RFL website: (http://www.rflelect.com/operatingmanual.html) or from the GARD8000 System chassis. Note that because of file size restrictions the manual downloaded from the GARD chassis has all graphics removed. (Once the GARD is powered up; from the Home web page click on “Settings,” select “File Operations,” select “Save File to PC," select “Gard System Manual PDF.”

• The GARD 8000 Emulator software can be used ahead of an actual commissioning in an off-

line mode in order to program the Current Diff Relay or GARD8000 system settings and save them to a file. Later, during the commissioning this file can be uploaded to the GARD 8000 system. The GARD 8000 Emulator software can be downloaded from RFL website: http://www.rflelect.com/GARD%208000.html

Proceed to the next page for a step for step Current Differential Relay Commissioning procedure.

GARD 8000 SYS RFL Electronics Inc. January 1, 2008 4-62 973.334.3100

http://www.rflelect.com/operatingmanual.html


4.6.5.1 EQUIPMENT REQUIREMENTS

1. Power System Simulator

2. Test Connectors

3. Ohmmeter or contact opening/closing sensing device

4. PC with Ethernet Port and Internet Explorer 5. Ethernet Cable (straight-thru) 6. Reference Control Drawings for all Hardware and Logic

4.6.5.2 POWER CONNECTIONS

1. Before powering up the GARD 8000 chassis remove the front panel, re-seat the front functional

modules, re-seat the Main Power Supply or Supplies, ensure that the power supply or supplies match the power requirements.

2. The Main power supply of the GARD 8000 is labeled on the rear terminal block as Power Supply #1. If the GARD 8000 relay was configured with the Main and Redundant Power Supplies, connect the power source on the rear terminal block labeled for Power Supply #1 and Power Supply #2.

3. Locate the rear panel power switch, move the switch to the ‘OFF’ position before connecting power. (In redundant configuration turn both switches to the ‘OFF’ position before connecting power).

4. Connect a station ground to the GND terminal on the Power Supply I/O module and connect a voltage source to the terminals marked + and -. Polarity is unimportant.

5. Turn on the voltage source connected to the GARD 8000 power supply inputs and move the power switch(es) to the ‘ON’ position.

4.6.5.3 BOOT-UP PROGRESS

1. A Boot-up progress of the GARD 8000 system can be monitored through the LED #1 located

on the Controller Module (see below). The front panel needs to be removed to observe the Status LED’s.

3. A complete Boot-up of the GARD 8000 is indicated by the LED #1 lighting Green. For more

information about other status Led’s on the Controller module please refer to the GARD8000 System Manual, section 6.1

Enable/Disable Switch

Figure 4-13. GARD 8000 Controller Module (Commissioning, Current Diff)

GARD 8000 SYS RFL Electronics Inc.

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4.6.5.4 ETHERNET CONNECTION

1. Connect an Ethernet cable from a PC to the front Ethernet port on GARD Display module. 2. Set IP address for a PC to 192.168.1.x (x = 6 to 254) 3. Open the web browser (Internet Explorer version 6 or greater). 4. Enter the GARD front port address into the address bar of the browser (192.168.1.1). 5. Login to the GARD by typing the User Name: Admin and User Password: Admin. 6. Set the rear port IP address (if desired) under ‘Settings’> ‘Chassis Configuration’ > ‘Controller’

page and set the system time through the ‘Systems Labels and Time’ web page.

4.6.5.5 LOGIC/SOFTWARE VERIFICATION

1. At ‘Home’ page click on “Help” and select ‘About’. 2. Verify current Logic and Systems Software revisions. 3. Confirm the programmed Logic file with the Logic name provided in the Reference Control Drawings. 4. Get familiar with the design of the Current Diff Relay Logic Scheme. The logic inside the

Current Diff Block on the Logic Schematic is fixed as delivered from the factory, but can be custom ordered for a specific application.

4.6.5.6 CURRENT DIFF RELAY WIRING VERIFICATION

1. Verify the Voltage and Current connections on the Current Diff Relay Input/Output module. The I/O terminals for the Current Diff Relay are labeled for each Phase and Ground. The I/O

connections are fixed, and should be wired according to the AC schematic shown on the following page. The Current Diff I/O module (rear interface) must be installed in the same physical slot as the Current Diff Relay Module (front module).



SLOT 3

GARD 8000Current Differential Relay Wiring

AC SCHEMATIC

Trip

ping

Dire

ctio

n

52

IG-

IG+

IC+

IC-

IB-

IB+

IG

IC

IB

IA

IA+IA-

Figure 4-14. Current Diff. Relay Wiring

Figure 4-15. GARD 8000 Current Diff Relay, I/O Connections


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4.6.5.7 CURRENT DIFF RELAY CONFIGURATION SETTINGS VERIFICATION 1. At the ‘Home’ page click on “Settings,” and select ‘Chassis Configuration’ 2. At ‘Chassis Configuration’ page click on “Current Diff Relay” 3. At ‘Current Diff Protection’ page shown below, confirm all of the Current Diff Relay settings

related to a specific application. 4. Ensure the Current Diff Relay Settings programmed at the Factory match the required settings.

4.6.5.8 CURRENT DIFF RELAY COMMUNICATIONS STATUS VERIFICATION

• The GARD 8000 will exhibit a Communications Alarm if the communications channel for the Current Diff Relay is not established. If the Current Diff Relay testing is going to be performed only at one end, the communications interface for the Current Diff Relay channel has to be under a local ‘loopback’. While the GARD unit is under a local loopback, the functional testing is limited to INTERNAL FAULT TRIPPING.

• A ‘loopback’ can be performed either by a ‘hard loopback’ or ‘software loopback. The type of hard loopback depends on the Comms Interface used for the Current Diff Relay channel. If the Comms interface is a Short Haul or Long Haul Fiber Optic module, connect a short patch cable between the TX to RX connectors (rear of the GARD). If the Comms interface is one of the Electrical Interface modules (T1/E1, RS-449, X.21, V.35, G.703) a ‘hard loopback’ connector would have to be made. Please refer to the GARD 8000 Instruction Manual, Section 4.5 to obtain the ‘pinouts’ for the Electrical Interface adapters.

• A software loopback can be enabled through the GARD test pages: From the ‘Home’ page click on “Test,” and select the proper Comms Interface module used for the Current Diff



channel. At the test page enable the Local Loopback and click on “Execute.” (The Figure below shows an example of the Test page for the C.37.94 Short Haul Fiber Interface). The GARD system will be in Alert while the Software Loopback Test is run.

• To prevent an address failure while testing only the Local End, ensure that the Local and

Remote addresses of the Current Diff Relay match. Verify/modify the Local or Remote Current Diff addresses by clicking on “Settings,” selecting “Chassis Configuration,” “Current Diff Relay” and then clicking on “Comms Settings.” See below.



• After either Loopback is enabled, verify the status of the Current Diff Relay: from the ‘Home’ page click on the “Current Diff Relay” module, and select “Communications Status.” A web page similar to the one shown below will appear.



• If the testing is performed in ‘Point-to-Point’ Two-Terminal setup, verify the Current Diff Relay Comms status using the above steps without enabling a Local loopback at the Local and Remote End.

• The status of the Communications channel can also be verified on the Comms interface programmed to transport the Current Diff channel. From the ‘Home’ page click on the Comms interface used for the Current Diff and verify the status of the communication channel (See below). A Minor Alarm will be active for the duration of the Forced Local Loopback.

4.6.5.9 INPUT/OUTPUT MAPPING VERIFICATION: • The physical Inputs and Outputs for the Current Diff Relay are mapped on the System Logic

Configuration web page. Any available hardware input or output can be freely assigned to any logical input or output that is available in the Input or Output mapping block (use the GARD 8000 logic drawings as a reference).

• Verify which logical inputs and outputs of the Current Diff Relay are mapped to the hardware

inputs and outputs using the web pages. Additional logical inputs or outputs could be mapped in the Input Mapping and Output Mapping Logic blocks located in the Current Diff Relay Logic Design.



4.6.5.10 LED ASSIGNMENT VERIFICATION: • Verify the front panel LED assignment used for the Current Differential Relay. The front panel

LED’s can be custom programmed to display various GARD System or Current Diff Relay functions or conditions. Please refer to the GARD 8000 Logic drawing or GARD 8000 webpage (Settings > System Labels and Triggers > LED Logic Assignments).

4.6.5.11 SYSTEM CONFIGURATION VERIFICATION

1. From the ‘Home’ page click on the “Controller” module. 2. Verify ‘System Labels,’ Active Power Supply or Supplies Voltages, Rear Port IP Address,

Network Mask, and System Time and Date (the IRIG-B if connected will overwrite the System Time and Date settings).

3. Modify the programmable settings, if needed.

If the remote station doesn’t have an Ethernet connection this page can be used to set up a 64Kbps or 8Kbps Remote Service channel (depending on the type of communication link). The Remote Service Channel function of the GARD 8000 can be used to interrogate a remote end. Please refer to the GARD8000 instruction manual (Section 2.13 and 5.3.5) for more information.



4.6.5.12 CURRENT DIFF RELAY TEST MODE

• Another option for commissioning testing is the Test Mode. The test mode is a relay function that blocks local tripping allowing commissioning and other diagnostic tests to be run without actually tripping breakers. CAUTION THE TEST MODE DISABLES BREAKER TRIPPING; IT SHOULD BE USED WITH EXTREME CAUTION. RFL recommends that the relay trip outputs be manually bypassed during testing when possible. While in test mode virtually all of the relay functions continue to operate as normal—currents are measured, messages are passed between relays, trips are calculated, and SOE and oscillography data is recorded. The trips are blocked from being sent to the breakers by the logic in the GARD controller.

• The Test Mode allows all of the functions of the relay to be simulated and tested.

When the relay is in test mode a minor alarm will be issued. To access the Test Mode, from Home page click on “Test,” select “System Test” and then click on “Current Diff Relay.” At the Current Diff Relay Test page check the box “Enter Test Mode” and then click on “Run Test” (See below).



4.6.5.13 CURRENT DIFF RELAY FUNCTIONAL TESTING

If the Comms channel of the GARD8000 Current Diff Relay is looped-back the functional testing is limited to the simulation of the Internal Faults. To simulate the External Faults configure the GARD units (Current Diff Relays) in back-to-back configuration. During the functional testing the Current Diff Relay SOE records, Current Diff Oscillography, Current Diff Last Trip, and GARD8000 System SOE records can be retrieved for an evaluation. • To retrieve the Current Diff Relay SOE’s click on the “Home” page, click on “Current Diff

Relay” and then select “Current Diff Sequence of Events”. • To retrieve the Current Diff Relay Oscillography records click on “Current Diff Relay” from

the “Home” page, select “Oscillography. Select one of the time stamped Oscillography records stored in the Current Diff Relay. All Oscillography (COMTRADE) type records are saved in a form of zip files which consists of two files: data and config. After a download is completed, and the saved file is un-zipped, the config file can be opened with ‘COMTRADE’ compatible software.

RFL can provide free of charge a copy of COMTRADE compatible software. Please contact RFL Customer Service at 973-334-3100 or by e-mail: [email protected].

• To retrieve the Current Diff Relay ‘Last Trip’ click on the “Home” page, click on “Current Diff Relay” and then select “Last Trip”.



4.6.5.14 CURRENT DIFF RELAY RECOMMENDED SETTINGS FOR FUNCTIONAL TESTING

1. General Settings:



2. Communications Settings:

3. Primary Settings:



4. Backup Settings:


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5. SOE Settings:



6. Oscillography Settings:

4.6.5.15 POWER SYSTEM SIMULATOR TEST PLANS • For the Differential Trip testing use the Current Amplitude settings specified in the Test Plans.

For the High Set Trip testing change the Current Amplitude settings from 4.5A to 15A and ensure that the High Set Trip setting in the Current Differential Relay Primary Settings is enabled and set for a factory default setting of 12A.

• Simulation of INTERNAL FAULTS can be performed on a GARD unit setup for a Local

Loopback or on two GARD units setup for Two Terminal/End-to-End configuration. Before proceeding with the Functional Testing verify the wiring of the Current Diff Relay to the Power System Simulator!


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Power Simulator Settings for a Local End (or a Remote End if configured) to verify Metering and Status:

Local End Remote End

Source Amplitude Phase Angle

Frequency (Hz) Amplitude Phase

Angle Frequency

(Hz) IA 5A 0° 60.00 5A 180° 60.00 IB 5A 240° 60.00 5A 60° 60.00 IC 5A 120° 60.00 5A -60° 60.00


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4.6.5.15.1 internal faults Phase to Phase Fault A B

Pre-Fault Settings Fault Settings



Angle Frequency

(Hz) IA 1A 0° 60.00 4.5A 0° 60.00 IB 1A 180° 60.00 4.5A 180° 60.00 IC 0A 0° 60.00 0A 0° 60.00

Typical Trip Time +/-3ms Solid State Output Relay Output

Differential 15.50ms 18.80ms High Set Trip 10.10ms 13.40ms

Phase to Phase Fault B C



Frequency (Hz)

Amplitude Phase Angle

Frequency (Hz)

IA 0A 0° 60.00 0A 0° 60.00 IB 1A 180° 60.00 4.5A 180° 60.00 IC 1A 0° 60.00 4.5A 0° 60.00



Phase to Phase Fault A C




Angle Frequency

(Hz) IA 1A 0° 60.00 4.5A 0° 60.00 IB 0A 0° 60.00 0A 0° 60.00 IC 1A 180° 60.00 4.5A 180° 60.00




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3 Phase Fault A B C




Angle Frequency

(Hz) IA 1A 0° 60.00 4.5A 0° 60.00 IB 1A 240° 60.00 4.5A 240° 60.00 IC 1A 120° 60.00 4.5A 120° 60.00



Phase to Ground Fault A G




Angle Frequency

(Hz) IA 1A 30° 60.00 4.5A 0° 60.00 IB 0A 240° 60.00 0A 120° 60.00 IC 0A 120° 60.00 0A 120° 60.00



Phase to Ground Fault B G




Angle Frequency

(Hz) IA 0A 0° 60.00 0A 0° 60.00 IB 1A 240° 60.00 4.5A 240° 60.00 IC 0A 120° 60.00 0A 120° 60.00





Phase to Ground Fault C G




Angle Frequency

(Hz) IA 0A 0° 60.00 0A 0° 60.00 IB 0A 240° 60.00 0A 240° 60.00 IC 1A 120° 60.00 4.5A 120° 60.00



4.6.5.15.2 power simulator test plans - EXTERNAL FAULTS 3 Phase to Phase Fault A B C: Settings for a Local End




Angle Frequency

(Hz) IA 1A 0° 60.00 15A 0° 60.00 IB 1A 240° 60.00 15A 240° 60.00 IC 1A 120° 60.00 15A 120° 60.00

3 Phase to Phase Fault A B C : Settings for a Remote End




Angle Frequency

(Hz) IA 1A 180° 60.00 15A 180° 60.00 IB 1A 60° 60.00 15A 60° 60.00 IC 1A -60° 60.00 15A -60° 60.00

Phase to Phase Fault A B: Settings for a Local End




Angle Frequency

(Hz) IA 1A 0° 60.00 15A 0° 60.00 IB 1A 180° 60.00 15A 180° 60.00 IC 1A 0° 60.00 0A 0° 60.00



Phase to Phase Fault A B: Settings for a Remote End




Angle Frequency

(Hz) IA 1A 180° 60.00 15A 180° 60.00 IB 1A 0° 60.00 15A 0° 60.00 IC 1A 0° 60.00 0A 0° 60.00

Phase to Phase Fault A C: Settings for a Local End




Angle Frequency

(Hz) IA 1A 0° 60.00 15A 180° 60.00 IB 1A 0° 60.00 0A 0° 60.00 IC 1A 180° 60.00 15A 0° 60.00

Phase to Phase Fault A C: Settings for a Remote End




Angle Frequency

(Hz) IA 1A 180° 60.00 15A 180° 60.00 IB 1A 0° 60.00 0A 0° 60.00 IC 1A 0° 60.00 15A 0° 60.00

Phase to Ground Fault A G: Settings for a Local End




Angle Frequency

(Hz) IA 1A 0° 60.00 15A 0° 60.00 IB 1A 0° 60.00 0A 0° 60.00 IC 1A 0° 60.00 0A 0° 60.00


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Phase to Ground Fault A G: Settings for a Remote End




Angle Frequency

(Hz) IA 1A 180° 60.00 15A 180° 60.00 IB 1A 0° 60.00 0A 0° 60.00 IC 1A 0° 60.00 0A 0° 60.00

Simulating External Trips using the provided test plans should not produce a Trip Condition!

4.6.5.16 TESTING BACK-UP OVERCURRENT FUNCTION:

1. Break the Communication Link. 2. Enable the ‘Back-up’ Setting on the webpage for ‘Current Differential Relay Backup

Settings.’ 3. Enable ‘Overcurrent Backup.’ 4. Program the Phase, Ground, and Timer Overcurrent settings as per the recommended Current

Differential Backup factory settings. 5. Setup a Power System Simulator for ‘Phase A’ to Ground Trips as shown below.




Angle Frequency

(Hz) IA 1A 0° 60.00 5A 0° 60.00 IB 0A 240° 60.00 0A 240° 60.00 IC 0A 120° 60.00 0A 120° 60.00

6. Run the test. 7. The Current Differential Relay should restrain and not trip since the ‘Phase A’ amplitude is

simulated at 5A and the Overcurrent Backup Phase setting in the GARD is programmed for 8A.

8. Change ‘Phase A’ amplitude to 10A. 9. Run the test again. 10. The Current Diff relay should trip for ‘Phase A’ to Ground fault. 11. Typical Trip Times for this test are shown below.


Overcurrent Backup 12.20ms 15.40ms

• After each test, the operation of the trip outputs can be verified by retrieving the Current Diff Relay SOE Records, System SOE records, Current Diff Relay Oscillography records, and Current Diff Relay Last Trip.



• During the testing or when the Current Transformer connections are wired to the Current Diff Relay I/O module verify the Metering Values. (Current Diff Relay Status Page 4-76).

4.6.5.17 LOADING A NEW CURRENT DIFF RELAY LOGIC (TXT FILE, EDN FILE)

1. At the Home Web page, click on “Settings” and select ‘File Operations.’ 2. Click on “Send File to Gard 8000.” 3. At “Send File to Gard 8000” select ‘System Logic Data Base (.txt file).

(Note: The txt file has to be loaded before the edn file) 4. Click on “Browse,” locate the new txt file and then click on “Send” 5. After uploading the txt file, follow the above steps to load the System Logic file (.edn). 6. Verify the Current Diff Relay settings. If the Current Diff Relay settings for a specific application

were not programmed in the factory, modify the programmable settings under ‘Settings’, ‘Chassis Configuration,’ ‘Distance Relay.’

7. Modify the Front Panel LED Logic Assignments, SOE Triggers and Labels, Logic Bit Labels, Alarm Configuration, Map the Inputs and Outputs in order to accommodate the new Current Diff Relay module.

4.6.5.18 LOADING A WHOLE CHASSIS CONFIGURATION

1. At the Home Web page, click on “Settings” and select ‘File Operations.’ 2. Click on “Send File to Gard 8000.” 3. At ‘Send File to Gard 8000’ select “Whole Chasis Config” (.zip file). 4. Click on “Browse,” locate the zip file and then click on “Send.” 5. After a successful loading, the message “power cycle the GARD8000 unit” is displayed.

This ends the Procedure


4.6.5 current differential relay commissioning … current differential relay commissioning...

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