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Test example: Areva 632 differential relay
Purpose of the test:
1. Check Ir/Id characteristica. Pick-up currentb. Gradient of points on slop 1c. Gradient of points on slop 2d. Instant tripping current
2. Check harmonic restraint a. 2nd harmonic restraintb. 5th harmonic restraint
3. Check trip time
Select ‘Differential’module
Setting and test windows
Installation and connection
Tripping characteristic
Equation for Ir/Id tripping characteristic
Characteristic equation for
Characteristic equation for slop 1
Tripping characteristic (continued)
Characteristic equation for slop 2
Rapid tripping current
Settings in AREVA 632
In the Relay setting paper or In AREVA632 we can find the following settings. Those marked yellow will be filled in the test module accordingly for proper test.
Power of the transformer
Vector group for A-B
Vector group for A-C
Pick-up current (pu value)
Rapid tripping current (pu value)
Gradient of slop 1
Gradient of slop 2
Knee point of slop 2 (put value)
5th harmonic restraint
2nd harmonic restraint
Matching fact. Kam, a
Matching fact. Kam, b
Matching fact. Kam, c
Matching factor for side A
Matching factor for side B
Matching factor for side C
0.7-5
0.7-5
0.7-5
Set ‘Setting’ in software test module
Click ‘Setting’to open the following screen and fill in the settings according to AREVA632 relay settings.
‘setting’screen in Differential test module of
PowerTest
There are two knee pointsfor Areva 632
Knee point 1 Knee point 2
Set ‘Parameters’in software test module
Click ‘para.’to open the following screen and fill in the settings according to AREVA632 relay settings and test requirement.
‘para’screen in Differential test module of
PowerTest
After we complete the setting the principle Ir/Id curve will be displayed on the screen
Set test items
By default the Differential (6I) module contains the following test items.
Activate the test items in the list
Click it to activate or deactivate this test item
Test item is activated
Test item is deactivated
1. Pickup test
Name: user definedTest Phase: defined in ‘para’IR: Ip1 here indicates the pickup current setting. We can select 0‐1*Ip1Type: the quantity selected here will be used in the test report. Because we are testing pickup current we need to select Id>
2. Slop test
Name: user definedTest Phase: defined in ‘para’IR: Double click the left mouse button to confirm the point on slopType : To check slop 1 we need to select slop 1 here. If we test two points on the slop then we can get gradient of the slop
Adding more test points
Click ‘Add Sweep’ to add more test points
We will check this pickup point
Here we have increased 5 more test points
3. Rapid tripping current test
The point on this flat section will be tested
4. 2nd harmonic restraint check (inrush stabilization)
5. 5th harmonic restraint check (saturation discriminator)
Set assessment
The assessment setting is used as the reference when judging the test results
For pickup and slop check normally 5% of relative error will be set
For harmonic restraint check we normally set 0.02% of the absolute error.
Set wiring
The wiring information can be preset to save the preparation time at site.
Move cursor to test item area and right click the mouse button to pop‐up the menu
Select ‘Message’ command to enter into the setting screen.
Fill in the relay terminal marks accordingly.
Here we can also make the notes
Click ‘OK’ button to confirm the setting and then we can view the wiring
If this option is selected the message for the next test item will be popping up for your reminder
With this option selected the test process will pause before proceeding to the next test item.
Set binary input
Check the binary input setting and be sure that the selected binary input setting is ‘Enable’.
Our binary inputs can automatically detect the status change for both potential or potential free contact. So there is no need to set contact type in the software
Note:
Differential relay
The current of LV side must be normalized to HV side in order get same phase shift
Conversion example: Y‐D‐11 connection