ETAP Relay Coordination Procedure
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ETAP Relay Coordination Procedure
ETAP Relay Co‐ordination Step by Step Procedure
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ETAP Relay Coordination Procedure
ETAP Relay Co‐ordination Step by Step Procedure The following are steps for ETAP Relay coordination for over current and earth fault protection. I. II. III. IV. V. VI.
Modeling of single line Diagram Modeling protection devices. Updating fault levels to all relays Creating of ETAP Star View (TCC charts) and Relay Settings Earth Fault Protection settings Checking the Sequence of Operation
I.
Modeling of Single Diagram. Step 1:
Model the single line Diagram in ETAP
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ETAP Relay Coordination Procedure
Step 2:
Add protection devices to Model from ETAP AC Edit Toolbar and Instrumentation
Toolbar
AC Edit Toolbar
Contactor
Fuse High Voltage Circuit
Low Voltage Circuit Breaker
Overload Heater
In-line Overload Relay
Instrumentation Toolbar
Potential Transformer
Current Transformer
Multi-Function Relay
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ETAP Relay Coordination Procedure
Step 3:
Start from the Dead End Equipment (i.e. 75kW motor load). Double click on the motor go to
Protection page enter following data 1. Starting Curves – Constant Terminal Voltage %Vt Acceleration Time (%) (sec) 100 2 80 4 2. Check in the box of Smooth Corners 3. Check in the box of Include starting device, OLH & equipment Cable
4. Asymmetrical LRC Asym. Factor
1.6
5. Thermal Limit Curve Hot start Cold Start Stator Curve
Check in the box Check in the box Check in the box
10 sec 15 Sec Check for points
Click here to see table of stator thermal current versus time curve (which is default in ETAP). Enter the vendor data in table. Here in this exercise assume ETAP default.
6. Click OK for saving the data into the motor model
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ETAP Relay Coordination Procedure
II. Step 4:
Modeling protection devices. ADD the following protection equipment to the Motor feeder from AC Edit Toolbar 1. In‐Line over load Relay (OL1) 2. Contactor (Cont1) 3. Fuse (Fuse1) 4. Switch (SW1)
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ETAP Relay Coordination Procedure
Step 5:
ADD the following protection equipment to the Single Line Diagram feeder from AC Edit
Toolbar 1. MCC Incomer (i.e. Incomer Bus 3) • Switch (SW2) 2. PMCC outgoing feeder (i.e. Outgoing Bus 2) • LV Circuit Breaker (CB3) • Current Transformer (CT1) • Multi‐Function Relay (Relay1) 3. PMCC Incomer (i.e. Incomer Bus 2) • LV Circuit Breaker (CB4) • Current Transformer (CT2) • Multi‐Function Relay (Relay2)
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ETAP Relay Coordination Procedure
Step 6:
ADD the following protection equipment to the Single Line Diagram feeder from AC Edit
Toolbar 1. 66kV Outgoing Circuit 2MVA Transformer (i.e. Transformer T1) 1. HV Circuit Breaker (CB5) 2. Current Transformer (CT3) 3. Multi‐Function Relay (Relay3) 2. 2MVA Transformer Neutral (i.e. Transformer T1) 1. Current Transformer (CT5) 2. Multi‐Function Relay (Relay5) 3. 6.6kV Bus Incomer (i.e. Bus1) 1. HV Circuit Breaker (CB1) 2. Current Transformer (CT4) 3. Multi‐Function Relay (Relay4)
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ETAP Relay Coordination Procedure
(Update protection equipment Data from the Library Data) Step 7:
Double Click on the In‐Line Overload Relay, go to Setting page.
Step 8:
Click on the Library and select the model as SIEMENS ‐ 3UF7. (SIEMENS – 3UF7 model will be added to Thermal Overload Relay)
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ETAP Relay Coordination Procedure
Step 9:
Select the Trip range “20 – 200 A Primary”. Click OK to update the data into the OLR.
Jam used for Locked rotor protection if required.
Step 10:
Double Click on the contactor in the motor feeder and enter the following ratings in the Info Page 1. Rated Voltage ‐ 0.6kV 2. Rated Continuous current – 250 A 3. Type – Contactor 4. Rated Interrupting Current – 2.5kA (Typically 8 to 10 times contactor rating)
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ETAP Relay Coordination Procedure
Step 11:
Similarly Update all protection equipment data from the library as per the below.
ETAP Equipment ID Fuse1 CT1 Relay1 CT2 Relay2 CT5 Relay5 CT3 Relay3 CT4 Relay4
Step 12:
Location Mtr Feeder Incomer MCC Incomer MCC Incomer PMCC Incomer PMCC Transformer Neutral Transformer Neutral Transformer Neutral Transformer Neutral Transformer Neutral Transformer Neutral
Equipment Fuse Current Transformer Multifunction Relay Current Transformer Multifunction Relay Current Transformer Multifunction Relay Current Transformer Multifunction Relay Current Transformer Multifunction Relay
Make and Model From ETAP Library GEC, HRC II‐C ‐‐‐‐‐ OCR, AREVA P122 ‐‐‐‐‐ OCR, AREVA P122 ‐‐‐‐‐‐ OCR, AREVA P122 ‐‐‐‐‐‐ OCR, AREVA P122 ‐‐‐‐‐‐ OCR, AREVA P122
Rating 250 A 800/1A ‐‐ 3000/1A ‐‐ 3000/1A ‐‐‐‐ 200/1A ‐‐‐‐ 600/1A ‐‐‐‐
Update all LV and HV circuit breaker operating Times. Double Click on Circuit Breaker, go to rating page update Minimum Time Delay, Including CB and Relay Delay “Min. Delay” as fallows. • LV Circuit Breaker ‐ 0.04 sec • HV Circuit Breaker ‐ 0.06sec
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ETAP Relay Coordination Procedure
III.
Updating Fault Levels To All Relays.
Step 13:
Click on Star‐Protective Device Coordination Module in Mode Toolbar.
Step 14:
Click on Edit Study Case box, go to info page Select all buses to fault.
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ETAP Relay Coordination Procedure
Step 15:
Click on Run / Update Short‐Circuit kA in the Star (PD Coordination) Toolbar. (This will update that short circuit levels in to the protective devices i.e. LV Circuit Breaker, Relay, MCCB, Fuse and OLR)
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ETAP Relay Coordination Procedure
Step 16:
Step 17:
Double click on the Fuse go TCC kA page and check for short Circuit Current is updated for TCC clipping current. Similarly check for other protective devices like Relay, MCCB, OLR and LV Circuit Breaker Select Sym rms fault for all devices, which is OK for time delayed coordination.
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ETAP Relay Coordination Procedure
IV.
Creating of ETAP Star View (Time Current Curve (TCC) Charts) and Relay Settings
Step 18:
Left click and make window around motor along with its protective devices (i.e. OLR, Contactor & Fuse) to select.
Step 19:
Now click on the Create Star View to create new start view (i.e. Star1).
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ETAP Relay Coordination Procedure
Step 20:
A TCC chart start view (i.e. Star1) is created as shown in below.
Double Click on Star1 here to give own titles for star view Double Click on scale to see scale & for changing it
Step 21:
Right Click on window then Click on the plot options to edit the properties of plots.
Using Plot options can hide or unhide the devices for this Right‐Click on the Star Chart, pick Devices ‐> Preferences & Check Phase and ground mode displaying. Page 15 of 45
ETAP Relay Coordination Procedure
Step 22:
Go to Legend Page rename to “01. 75kW Motor Ckt”. Click OK to save the name.
(Check for change in the name of start view (TCC))
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ETAP Relay Coordination Procedure
Step 23:
Show the grid by clicking on the Show Grid.
Step 24:
Set the motor protection as below Double Click on Over Load Relay, go to setting page set the following 1. Click on Thermal for Over Current or Over Load setting ¾ Current pick up (Trip) = 1.05 to 1.1 times of FLC of Motor (123.5*1.1=135.9A) ¾ Time Delay ÆSet above motor start Æ Set Below the stator thermal damage curve
2. Click on Jam for Locked rotor or Jam or Stall protection ¾ Current pick up (Trip) = 150 to 200% of FLC of Motor (set for 200%)
¾ Click OK to save the data. ¾ Time Delay ÆSet above motor start Æ Set Below the stator thermal damage curve
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ETAP Relay Coordination Procedure ¾ Adjust the time delay (change Class 5 to Class 10 etc. to change OLR timing) using time handle on the OLR Jam protection Curve. Set it above motor starting start and below the motor stator & rotor thermal damage curve.
Step 25:
Now go to Single Line Diagram View (One‐Line Diagrams). Left Click and Hold and make window around Motor feeder (OLR, FUSE) and MCC Incomer Relay(i.e. Relay1).
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ETAP Relay Coordination Procedure
Step 26:
Create new star view by clicking on the Create Star View (Star2). Rename Star2 to “02. MCC Incomer”.
Step 27:
Double click on Relay1 (i.e. MCC Incomer), go to OCR ‐> Phase page and set the over current protection as 1. Check in Over current Box 2. Select IEC‐Extremely Inverse curve to match with outgoing Fuse characteristics 3. Set Pickup as 0.95 (i.e. 800x0.95=760A)
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ETAP Relay Coordination Procedure
Step 28:
Adjust the time delay by using time handle on plot such that it is above characteristics of fuse below the MCC incomer cable thermal withstand.
Step 29:
Now go to Single Line Diagram View (One‐Line Diagrams). Left Click and Hold and make window around MCC Incomer Relay and PMCC Incomer (Transformer Outgoing) relay.
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ETAP Relay Coordination Procedure
Step 30:
Create new star view and Rename is to “03. PMCC to MCC Circuit”.
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ETAP Relay Coordination Procedure
Step 31:
Double click on Relay2 (i.e. PMCC Incomer), go to OCR ‐> Phase page and set the over current protection 1. Check in Over current box 2. Select IEC‐Standard Inverse curve. 3. Set Pickup current transformer full load current with 5% Margin Transformer 2MVA, 6.6/0.415kV Transformer Secondary (LV side) Line Current Itr_sec = Pickup setting with 5% Margin =
_
.
.
.
2782.41
√ .
.
Step 32:
Adjust the time delay of Relay2 by using time handle such that it is above the Relay1 curve. (Time difference can be easily measured by sing Time Difference tool)
Time Difference
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ETAP Relay Coordination Procedure
Step 33:
Click on Time Difference Tool and the curves above and below curve for which time difference has to measure. • Click and move time difference measurement location to fault level. • Set the TMS of Relay2 by adjusting the Relay2 curve using time dial such that the time difference with Relay1 curve at fault level equal to 300 milli‐sec. Use this to measure time difference between two relays
(Measure time difference at fault current to be coordinated)
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ETAP Relay Coordination Procedure
Step 34:
Go to Single Line Diagram View (One‐Line Diagrams). Left Click and Hold and make window around PMCC Incomer Relay and Transformer Incomer Relay and 6.6kV Switchgear Incomer Relay.
Step 35:
Create new star view and Rename is to “04. 6.6kV SWGR IC”.
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ETAP Relay Coordination Procedure
Step 36:
Double click on Relay3 (i.e. Transformer Incomer) set the over current protection 1. Select IEC‐Standard Inverse curve. 2. Set Pickup current transformer full load current with 5% Margin 3. Transformer 2MVA, 6.6/0.415kV 4. Transformer Primary (HV side) Line Current Itr_pry = 5. Pickup setting with 5% Margin =
_
.
.
.
183.7A
√ .
.
Step 37:
Adjust the curve of Relay3 curve such that it should be above the curve of Relay2 and Transformer Inrush current and also time difference equal to 300 milli‐sec and it should be below Transformer Thermal withstand curve.
Set In‐rush to typical value of 12 times for 0.1 sec (which is 5Cycles at 50Hz)
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ETAP Relay Coordination Procedure
Step 38:
Here for Fault current seen by the Transformer Incomer Relay as per below table. Fault Location
Fault Current seen by the Transformer Incomer relay @6.6kV Fault at Transformer Secondary (LV 0.415kV side) 2.681 kA Fault at Transformer Primary (HV 6.6kV side) 40.052kA From the above table fault level difference is more. So the Transformer Incomer Relay instantaneous over protection is enabled for fault current above 140% above the transformer secondary fault level. Set the instantaneous current protection setting as 1. Instantaneous setting =
_
.
.
.
.
2. Set the time dial at minimum time say 0.01sec
Check in Integrated Curves to Integrate over current & Instantaneous Currents
Before Integration
After Integration
=
Æ I
Æ Time
Æ Time
Step 39:
Æ I
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ETAP Relay Coordination Procedure
Step 40:
And ensure that Relay3 curve is below the Transformer Thermal withstand curve and above the transformer Inrush current
Step 41:
Double click on Relay4 (i.e. 6.6kV Switchgear Incomer) go to OCR ‐> Phase page and set the over current protection as 1. Check in Overcurrent Box 2. Select IEC‐Very Inverse curve. .
3. Set Pickup current transformer full load current i.e. 588A, Pickup =
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ETAP Relay Coordination Procedure
Step 42:
Set TMS of Relay4 by moving the curve of Relay4 curve time dial such that it should be above the curve of Relay3 and time difference at fault level is 300 milli‐secs. Ensure that time difference at short currents below fault level is more that 300 milli‐sec (this can be checked by moving time difference position at various fault currents).
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ETAP Relay Coordination Procedure
V.
Earth Fault Protection settings
Step 43: Open “02. MCC Incomer” start view (TCC), click on Mode to view earth fault view. 1. Select the IEC‐Standard Inverse curve 2. Pick up setting ‐ 0.5
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ETAP Relay Coordination Procedure
Step 44:
Double click on the Relay2 go to OCR ‐> Ground Page set earth fault protection settings as 1. Select the IEC‐Standard Inverse curve 2. Pick up setting ‐ 0.5
Step 45:
Adjust curve time by using time handle. (set The TMS ‐ 0.1)
Step 46:
In similar way all other earth fault current settings can be done.
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ETAP Relay Coordination Procedure
FINAL STAR VIEWS WITH PROTECTION SETTINGS
Over Current Protection Settings 0.1.
Over Current Protection 75kW Motor Ckt
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ETAP Relay Coordination Procedure 0.2.
Over Current Protection of MCC Incomer
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ETAP Relay Coordination Procedure 0.3.
Over Current Protection of PMCC to MCC Circuit
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ETAP Relay Coordination Procedure 0.4.
Over Current Protection of 6.6kV Outgoing Feeder (2MVA Transformer) and 6.6kV Switchgear Incomer
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ETAP Relay Coordination Procedure
Earth Fault Protection Settings 0.5.
Earth Fault Protection of MCC Incomer
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ETAP Relay Coordination Procedure 0.6.
Earth Fault Protection of PMCC to MCC Circuit
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ETAP Relay Coordination Procedure 0.7.
Earth Fault Protection of 6.6kV Outgoing Feeder (2MVA Transformer) and 6.6kV Switchgear Incomer
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ETAP Relay Coordination Procedure
VI.
Checking the Sequence of Operation
Step 47:
Update rely output signal to corresponding Circuit Breakers. Double Click on Relay1 and Go to Output Page, Click on Add and select Relay Element ‐ Any Level/Zone ‐ Any Device ‐ LVCB ID ‐ CB3 Action ‐ Open
Click OK to save the data. Page 38 of 45
ETAP Relay Coordination Procedure
Step 48:
Step 49:
Similarly update all relay Interlock (output) signals as table below Interlock Editor Page Settings Relay ID Relay Element Level/Zone Device ID Relay1 Any Any LVCB CB3 Relay2 Any Any LVCB CB4 Relay5 Any Any LVCB CB4 Relay3 Any Any HVCB CB5 Relay4 Any Any HVCB CB1 Create one start view with all protection Devices in the circuit Path.
Action Open Open Open Open Open
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ETAP Relay Coordination Procedure
Step 50:
Rename start view to “05. Sequence of Operation”.
Step 51:
Go to Single Line diagram create new study case “SOP”
new study case
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ETAP Relay Coordination Procedure
Step 52:
Click on the Edit Study Case box, go to Seq of Op (Sequence of Operation) page. Set the following Fault Value ‐ Sym. rms Protective Devices Considered (Bus Levels Away from Fault) ‐ 20 Fault type ‐ 3 Phase Protective Devices Operated (Devices to Flash) ‐ 9
Click it to Maximum allowed in ETAP
Check it to Maximum allowed in ETAP
Click OK to save the case settings. Page 41 of 45
ETAP Relay Coordination Procedure
Step 53:
Click on the Fault Insertion and place above the 75kW Motor, and the give the output file name as “FLT on MTR FDR”. Click OK to run case.
Fault Insertion
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ETAP Relay Coordination Procedure
Step 54:
Then check on screen for the Devices flashing (Devices are operating for 3‐Phase fault on Motor feeder).
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ETAP Relay Coordination Procedure
Step 55:
Click on the Sequence Viewer to see the Sequence‐of‐operation events with time.
Sequence Viewer
Step 56: Step 57:
Same thing can be checked by using Normalized Tcc tool. Open the “05. Sequence operation” star view (TCC), Select out report as “ FLT on MTR FDR”
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ETAP Relay Coordination Procedure
Step 58:
Click on Normalized TCC to see fault current as Gray line and Relay operating times on TCC.
3‐Phase Motor Terminal Fault Current
Observation:
Element Fuse1 Relay1 Relay2 Relay3 Relay4
3‐Phase fault applied on Motor Terminal a current of 15.57kA flows at 0.415kV Level Remark Operating time Time Difference With Location (sec) Below Element (Sec) Motor Feeder Minimum Operating Time OK 0.01 0.01 MCC Incomer Fuse ‐Relay >150ms OK 0.201 0.191 PMCC Incomer Relay‐Relay >300ms OK 0.826 0.625 Transformer Incomer Relay‐Relay >300ms OK 1.3 0.474 6.6kV SWGR Incomer Relay‐Relay >300ms OK 8.69 7.39
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