In the fourth article we configured non-directional earth fault protection and disturbance recorder. Full course of VAMP40 you can find here.
In this article we are going to configure current circuits supervision, 2nd harmonic blocking function and free programmable current curve.
It is important to control currents circuits. Broken currents circuits lead to damage current transformer. By using current circuit supervision, we avoid this damage.
2nd harmonic blocking function is needed if feeder supplies power transformer. At connecting time of power transformer there appears magnetizing currents in the network. These currents are 5-10 times of nominal current In of power transformer. Because of these big magnetizing currents overcurrent protection will trip. This is not correct tripping. Magnetizing currents have 2nd harmonic. 2nd harmonic can be about 30% from first harmonic. By using 2nd harmonic blocking function we can avoid wrong tripping of overcurrent protection at connecting time of power transformer.
Free programable current curve is used when standard current curves are not suitable. In this case we can configure own current curve. VAMP40 terminal has three free programable curves.
Sequence of the article:
1. Current circuits supervision configuration.
2. Testing of current circuits supervision function.
3. 2nd harmonic blocking function configuration.
4. Testing of 2nd harmonic blocking function.
5. Free programable current curve configuration.
6. Testing free programable current curve.
1. Current circuits supervision configuration.
In Vampset program on left right window select option „CT Supervisor“:
Fig. 1
Set parameters on right side window as shown in the picture:
Fig. 2
Here:
„Imax> setting“ –current which must be exceed in normal condition
„Imin< setting“ – current which must be not exceeded when current circuit failure appears In our case to activate current circuit failure, in not coruppted phase A current should be I>0,8xIn>640 A, and in coruppted phase, for example phase C, current should be <0.2xIn>160 A (see fig.2).
„Operation delay“ – delay time, t=10 s; after 10 s activates CT supervisor signal
„CT supervisor event on“ – when activates CT supervisor signal, this event will be written in event list
„CT supervisor event off“ – when resets CT supervisor signal, this event will be written in event list
„Fault log“ – here you can check when occured current circuits fault, and how big currents unbalance was
Send changed configuration to VAMP40 by pressing button
Fig. 3
Now we need to connect „CT supervisor“ signal to A1 binary output.
On left side window select option „Logic“:
Fig.4
On left side window click left mouse button and select „Yes“:
Fig. 5
Logical element „AND“ appears. Click on it left mouse button and press „Select input signals“:
Fig. 6
On left side window „Input signals available“ select „CT supervisor“:
Fig. 7
Press button „ADD“ to add „CT supervisor“ signal to configuration:
Fig. 8
Press button „OK“.
Fig. 9
In the same manner add output signal „A1“:
Fig. 10
Send changed configuration to VAMP40 by pressing button
Fig.11
On window „Boot Bending“ press button „Boot now“:
Fig. 12
Read configuration from VAMP40 to persuade corect configuration. Press button:
Fig. 13
Configuration sent correct:
Fig. 14
Now we need to connect „CT supervisor“ signal to LED „E“.
On left side window select option „OUTPUT MATRIX“:
Fig. 15
Pick dots on right side window to signals „Logic output 1“and „LE“ as shown in the picture:
Fig. 16
Send changed configuration to VAMP40 by pressing button
Fig. 17
Now we need to edit logic outputs events. Make changes as shown in the picture:
Fig. 18
Here „logic output 3“ is named as CBFP, „logic output 1“ as „CT supervisor“.
Send changed configuration to VAMP40.
2. Testing of current circuits supervision function.
Testing scheme is shown in the article „VAMP40 course – fider: 2. Overcurrent protection first stage“ figure 1.
Inject currents:
Ia= 4,9 A, φ=0° (4,9A>0,8xIn=Imax) Ib=0,8 A, φ=240° (0,8A<0,2xIn=Imin) Ic=4,9 A, φ=120° (4,9A>0,8xIn=Imax)
On left side window select „Angle diagram“:
Fig. 19
Press button
Fig. 20
Online measurements in “Vampset” program:
Fig. 21
On left side window select „RELAYS“:
Fig. 22
Binary output „A1 (Alarm EHA)“ is active:
Fig. 23
LED „E“ is active (indicates currents circuit fault):
Fig. 24
After currents circuits fault disappearing, LED „E“ and binary output „A1“ resets automatically.
Currents circuits fault is recorded in event list:
Fig. 25
Currents circuit control function is configured correctly.
3. 2nd harmonic blocking function configuration.
On left side window select option „2nd harmonic stage If2> 51F2“:
Fig. 26
Set parameters as shown in the picture:
Fig. 27
Send changed configuration to VAMP40 by pressing button
Fig. 28
On left side window select „Block matrix“:
Fig. 29
Pick dots in the matrix as shown in the picture:
Fig. 30
2nd harmonic function will block I> and I>> stages.
Send changed configuration to VAMP40 by pressing button
Fig. 31
Now we need to indicate activating of 2nd harmonic blocking function by LED „F“.
On left side window select „Logic“:
Fig. 32
Connect 2nd harmonic signals „2.Harm start“ and „2.Harm trip“ connect to LED „LF“ in logic:
Fig. 33
Send changed configuration to VAMP40 by pressing button
Fig. 34
Press button „Boot now“:
Fig. 35
On left side window of „Vampset“ select „Stage event enabling“. Pick dots in the matrix as shown in the picture:
Fig. 36
Now activating of 2nd harmonic blocking function will be recorded in the event buffer (event list).
Send changed configuration to VAMP40 by pressing button
Fig. 37
2nd harmonic blocking function configuration is completed.
4. Testing of 2nd harmonic blocking function.
Testing scheme is shown in the article „VAMP40 course – fider: 2. Overcurrent protection first stage“ figure 1.
Inject currents with second harmonic 16%:
Ia = 19,5 A, φ=0° (2nd harmonic 16%) Ib = 19,5 A, φ=240° (2nd harmonic 16%) Ic = 19,5 A, φ=120° (2nd harmonic 16%)
Overcurrent stage I>> didin‘t trip, LED “F“ activated:
Fig. 38
Fig. 39
Active LED “F“ indicates that 2nd harmonic blocking function tripped.
2nd harmonic blocking function event is recorded in event buffer:
Fig. 40
5. Free programable current curve configuration.
If you can not use standard currents curves (IEC, IEEE, IEEE1), you can configure own current curve.
On left side window select „Programmable delay curves“:
Fig. 41
Here we can to configure three curves: „Delay curve 1“, „Delay curve 2“ and „Delay curve 3“.
We arge going to configure „Delay curve 1“. Set currents curve characteristic as shown in the picture:
Fig. 42
Send changed configuration to VAMP40 by pressing button
Fig. 43
Press button „Boot now“ to restart VAMP40 terminal:
Fig. 44
Now we need to select and enable configured „Delay curve 1“.
On left side window select „Overcurrent stage I>“:
Fig. 45
On right side window, option „Delay curve family“ set to from „IEC“ to „Prg1“, option „Pick-up setting“ set to 0.6xIn:
Fig. 46
Send changed configuration to VAMP40 by pressing button
Fig. 47
Current curve is configured and selected.
Now we are going to test this current curve.
6. Testing free programable current curve.
Testing scheme:
Fig. 48
Testing measurements:
Here Is=0,6xIn=0,6×5=3 A (see fig. 48 option „Pick-up setting“).
Testing results show that measured currents characteristic is equal to configured „Delay curve 1“.
After selecting „Event buffer“ on left side window, you can explore „Delay curve 1“:
Fig. 49
That‘s all!
Configuration of VAMP40 is easy and convenient. All course of VAMP40 configuration you can find here.