In the first article „VAMP40 course: 1 – general settings and connection scheme“ I described how to configure general settings of VAMP40 terminal. In this article we are going to configure overcurrent protection (I>, first stage) for VAMP40.
Sequence of article:
1. Analogue currents inputs testing.
2. Overcurrent first stage I> configuration.
3. Connection overcurrent protection to binary output T1 and LED “A”.
4. Event list configuration.
5. Overcurrent protection (I>) testing.
- Analogue currents inputs testing.
Now we need to test analogue current inputs. Are analogue current inputs configured correctly?
Testing circuit is shown in the picture bellow:
Fig.1
Open the configuration file. Connect to VAMP40 PLC in VAMPSET software by clicking button
Fig.2
Inject currents from testing units:
Ia=1 A, φ=0°
Ib=1 A, φ=240°
Ic=1A, φ=120°
It is two methods to check measurements:
A. Checking mesurements with Vampset sofware
B. Checking measurements manually in HMI of VAMP40 terminal.
A. Checking mesurements with Vampset sofware.
Press button “Enable continuous updating ”
Fig.3
After selecting “Current&Voltage” on left side window you will see currents measurements
Fig.4
After selecting “ANGLE DIAGRAM” on left side window you will see phase currents:
Fig.5
In first article we set primary current of current transformer to 800 A, and secondary current – to 5 A. We injected 1A from testing unit, so in primary value we have (800A x 1A)/5A=160 A. Measuring inputs are configured correct.
B. Checking measurements manually in HMI of VAMP40 terminal:
a) By pressing button „down“ select „Meas“.
b) Press button „to right“, you will see currents measurements.
IL 1 input: 160 A
Fig.6
Press button „down“ to see IL2 measurement input:
Fig.7
Press button „down“ to see IL3 measurement input:
Fig.8
Measuring inputs IL1, IL2, IL3 are configured correctly.
2. Overcurrent first stage I> configuration.
VAMP40 terminal has three overcurrents stages: I>, I>>, I>>>. All these stages are non-directional.
Stage I> current settings can be 0,1÷5xIn.
Time function modes: „definite time“ or „IDMT“.
„Definite time“ mode means, that for example, if I> setting is set to 0,1 A, and time is set to 0,2 s, then when current reaches 800A x 0,1 A = 80 A, after 0,2 s stage I> activates (will trip).
„IDMT“ mode means, that inverse time operation characteristic will be used. In figure 9 is shown inverse time operation characteristic:
Fig.9
In figure 9 we can see that, if current is greater, time is shorter and vice versa.
Stage I> has various IDMT curves: IEC, IEEE, RI, EI, VI, NI, LTI, MI, IEEE2 (see manufacturer‘s “VAMP40 Feeder and motor protection relay – technical description“ VAMP40 manual, page 173).
Only stage I> has IDMT curves. Stages I>> ir I>>> have only “Definite time” modes. Therefore stage I> is used as overcurrent protection of feeders, motors, capacitor banks, power transformers. Stages I>> and I>>> are used as cut-off protection.
Stage I>> current settings can be 0,1÷20xIn. Stage I>>> current settings can be 0,1÷40xIn.
In this article we are going to configure stage I>.
After selecting “Overcurrent stage I>” on left side window, set parameters of stage I> as shown in the picture bellow:
Fig.10
On right side window “Overcurrent stage I> 50/51” there are two options – “Group 1” and “Group 2”. Parameter „Group=1“, so only „Group 1“ settings of stage I> are active. In this case „Group 2“ is not active.
Here:
“Pick-up settings” – stage’s I> currents settings in amperes; 800×1,1=880A
“Delay curve family” – family of curves; selected IEC family
„Delay type“ – curve type; selected NI (normal inverse) curve
„Inv. time coefficient k“ – coefficient k; selected k=20
When I> setting is 1,1xIn and flowing current in busbar is 20xIn (20x800A=16000A), stage I> will trip after 0,45 s:
| I, A | t, s |
| 20xIn (20×800=16000 A) | 0,45 |
| 4xIn (4×800=3200A) | 0,99 |
| 1xIn (1×800=800 A) | 140,86 |
Character of I> curve depends on selecting of family curves type. In manufacturer’s manual “VAMP40 Feeder and motor protection relay – technical description“ on page 76 is shown IEC family NI type curve:
Fig.11
In manufacturer’s manual “VAMP40 Feeder and motor protection relay – technical description“ on page 83 is shown RI curve:
Fig.12
There are big differences between IEC and RI families curves.
Character of I> curve depends also on sellecting of curves type of the same family.
IEC family NI curve type:
Fig.13
IEC family VI (very inverse) curve:
Fig.14
When I> setting is 1,1xIn (see parameter “Pick-up setting”), in case of IEC NI curve (see fig.13) at 4xIn, stage I> will trip after 0,99 s. In case of IEC VI curve (see fig.14) at 4xIn, stage I> will trip after 0,89 s. By sellecting parameter “Delay type” you can change curve character.
Character of I> curve depends also on sellecting of coefficient k of the same curve family.
In case of IEC NI curve, at 4xIn, when k=0,2, stage I> will trip after 0,99 s (see fig. 13). In case of IEC NI curve, at 4xIn, when k=0,3, stage I> will trip after 1,49 s.
Fig.15
By selecting parameter „Inv time coefficient k“ you can change a little bit curve character. In figure 11 you can explore curve‘s character at various k values.
So we understood meanings of parameters “Pick-up settings”, “Delay curve family”, „Delay type“, „Inv time coefficient k“.
You can calculate each family curve characteristics by using mathematical equations. For example, in manufacturers VAMP40 manual “VAMP40 Feeder and motor protection relay – technical description“, on page 75, equation is given to calculate IEC NI curve times. Various IDMT curves IEC, IEEE, RI, EI, VI, NI, LTI, MI, IEEE2 have own equations.
Reassign coefficient k value to 0,2:
Fig.16
In the figure 16 stage‘s I> protection final settings are given.
Send final setting of I> protection by pressing button
Fig.17
Purpose of “Write current view to device” button – by pressing this button you will send parameters of active visible window. So using this function you don’t need each time to send all configuration to VAMP40.
The configuration of overcurrent stage I> protection is completed.
Next step is to connect stage I> tripping to binary output T1 and LED „A“.
3. Connection overcurent I> to binary output T1 and LED “A”.
Stage‘s I> tripping must activate binary output T1. This ouput opens circuit breaker. We use also this binary ouput to measure stage‘s I> timing.
After selecting „Output Matrix“ on left side window, add dots to output matrix on right side window as shown in the the picture:
Fig.18
Double dot „connected and latched“ means that after stage I> tripping, binary output T1 and LED „A“ will be in active state. When circuit breaker opens, binary output T1 and LED „A“ still remains in active state. You must reset binary output T1 and LED „A“ manually by using „Enter“ button on front panel of VAMP40.
Single dot „connected“ means that after opening circuit breaker or resetting protection binary output T1 and LED „A“ will reset automatically.
Send output matrix configuration by pressing button
Fig.19
4. Event list configuration.
PLC VAMP 40 has event list function. In event list you can explore events at desirable date and time.
Select „EVENT BUFFER“ on left side window to open event list:
Fig.20
So far we didn‘t test stage I>, so event list is minimal yet. There are only VAMP40 PLC restarting events in event buffer (see figure 20, events “Device restart”).
Now we are going to configure event list.
After selecting „STAGE EVENT ENABLING“ on left side window, on right side window appears configuration matrix of events:
Fig.21
We need to configure stage‘s I> events, so choose only stage‘s I> events as shown in the picture bellow:
(by pressing on left side mouse button):
Fig.22
All other events you should reseted.
Send event list configuration by pressing button:
Fig.23
After selecting „PROTECTION EVENT ENABLING“ on left side window, on right side window select parameters as shown in the picture bellow:
Fig.24
Here parameter „SetGrp common change“ is deactivated because we are using only group 1 settings (see option „SetGrp common change“). This option is usefull when there group 1 and group2 settings groups are using. Then we can explore when occurs switching from one setting group to another.
Send event list configuration to VAMP40 by pressing button:
Fig.25
That’s all of event list configuration!
So now we are going to test stage I>.
5. Overcurrent protection (I>) testing.
Testing scheme is shown in the picture bellow:
Fig.26
Here we are going to use binary output T1 for measuring tripping time of stage I>.
Testing results:
|
Current, A |
time, s | phase |
|
0,8xIp (4,4A) |
– |
A |
|
1,21xIp (6,7A) |
7,078 |
A |
|
2xIp (11A) |
2,022 | A |
| 2,5xIp (13,75A) | 1,51 |
A |
|
3xIp (16,5A) |
1,268 |
A |
| 3,6xIp (19,8A) | 1,073 |
A |
Here Ip=5,5A is pick-up setting (Ip=1,1xIn=1,1Ax5A=5,5A, where In=5A)
|
current, A |
time, s | phase |
|
0,8xIp (4,4A) |
– | B |
| 1,21xIp (6,7A) | 7,039 |
B |
| 2xIp (11A) | 2,014 |
B |
|
2,5xIp (13,75A) |
1,517 | B |
|
3xIp (16,5A) |
1,27 |
B |
| 3,6xIp (19,8A) | 1,07 |
B |
|
Current, A |
time, s | phase |
|
0,8xIp (4,4A) |
– |
C |
| 1,21xIp (6,7A) | 7,066 |
C |
|
2xIp (11A) |
2,011 | C |
|
2,5xIp (13,75A) |
1,521 |
C |
| 3xIp (16,5A) | 1,251 |
C |
|
3,6xIp (19,8A) |
1,081 |
C |
|
Current, A |
time, s |
phase |
|
0,8xIp (4,4A) |
– | A-B |
| 1,21xIp (6,7A) | 7,036 |
A-B |
|
2xIp (11A) |
2,025 | A-B |
| 2,5xIp (13,75A) | 1,522 |
A-B |
|
3xIp (16,5A) |
1,26 | A-B |
| 3,6xIp (19,8A) | 1,077 |
A-B |
|
Current, A |
time, s | phase |
| 0,8xIp (4,4A) | – |
A-C |
|
1,21xIp (6,7A) |
7,036 | A-C |
| 2xIp (11A) | 1,995 |
A-C |
|
2,5xIp (13,75A) |
1,511 | A-C |
|
3xIp (16,5A) |
1,252 |
A-C |
| 3,6xIp (19,8A) | 1,08 |
A-C |
|
Current, A |
time, s | phase |
| 0,8xIp (4,4A) | – |
B-C |
|
1,21xIp (6,7A) |
7,005 | B-C |
| 2xIp (11A) | 2,015 |
B-C |
|
2,5xIp (13,75A) |
1,521 | B-C |
| 3xIp (16,5A) | 1,277 |
B-C |
|
3,6xIp (19,8A) |
1,062 |
B-C |
|
Current, A |
time, s | phase |
| 0,8xIp (4,4A) | – |
A-B-C |
|
1,21xIp (6,7A) |
7,004 | A-B-C |
| 2xIp (11A) | 1,99 |
A-B-C |
|
2,5xIp (13,75A) |
1,508 | A-B-C |
| 3xIp (16,5A) | 1,251 |
A-B-C |
|
3,6xIp (19,8A) |
1,068 |
A-B-C |
Stage I> tripped, LED “A” is active, IL1, IL2, IL3 currents are 6,7 A:
Fig.27
IL2 current:
Fig.28
Here 1,34xIn=1,34x5A=6,7A in secondary values.
Now we need to check event list to convince or the recorded events of stage I> starting and tripping.
Event list:
Fig.29
As seen in event buffer three phase L1-L2-L3 overcurrent at time 10:49:44:871 started and at time 10:49:51:831 tripped. Stage I> tripped after about 7 s (10:49:51:831 – 10:49:44:871 = 7s). In event list you can explore when protection activated (event “L1 Trip 1,34xIn”), when resetted (event “L1 Trip Off“), how big magnitude was (event “L1Trip 1,34xIn“), in which phase fault occured (event “L1 Trip 1,34xIn”).
In stage‘s I> fault log you can also to see fault record. To see stage I> fault log select “Overcurrent stage I>” on left side window:
Fig.30
On right side window on option “Fault log” we see record [1]: Fault type – three phase fault L1-L2-L3, fault magnitude – 1,35xIn=1,35x5A=6,75A in secondary values; in primary values – 6,75x(800A/5A)=1080A.
So we configured overcurrent stage I> correctly .