VAMP40 course – feeder: 3. Overcurrent protection second stage I>> and CBFP protection

In the first article “VAMP40 course: 1 – general settings and connection scheme” we set general settings for VAMP40 terminal. In second article “VAMP40 course – fider: 2. Overcurrent protection first stage” we configured and tested stage I>.

Now we are going to set to cut-off stage I>> and circuit breaker failure protection (CBFP).

Sequence of the article:

1. Overcurrent protection I>> configuration.
2. Connection overcurrent protection I>> to binary output T1 and LED „B“.
3. Stage I>> event list configuration.
4. CBFP protection configuration.
5. Overcurrent protection I>> testing.
6. CBFP protection testing: CBFP to incoming cubicle.
7. CBFP protection testing: CBFP to sectional cubicle.

1. Overcurrent protection I>> configuration.

VAMP40 has three stages of overcurrent protection: I>, I>>, I>>>.

Stages I>> ir I>>> have only “Definite time” modes. More detail about mode „Definite time“ read in 2nd article „VAMP40 course – fider: 2. Overcurrent protection first stage“ in particle 2 „Overcurrent first stage configuration“. Stages I>> and I>> are using for protection from short-circuit.

Open configuration file. After selecting on left right window „Overcurrent stage I>> 50/51“, set parameters on right side window as shown in the picture:

Fig. 1

Press button

Fig. 2

to send stage I>> settings to VAMP40 terminal.

Press button „Refresh current view from device“

Fig. 3

Stage‘s I>> setting sended successfull:

Fig. 4

On right side window we have “Group 1” and “Group 2” options. Because Group=1, only „Group 1“ settings are active. “Group 2” settings are not active.

Here:

„Pick-up setting“ – stage’s I>> current settings in amperes; 3.80xIn=3.8x800A=3040A. Here 800 A is current transformer‘s primary winding current rating (see first article „VAMP40 course: 1 – general settings and connection scheme“, particle 4. „Setting measuring inputs.“).

„Operation delay“ – stage I>> tripping time; Tripping time of stage I>> is instantaneous.

Configuration of stage I>> is completed. Next step is connection overcurrent protection I>> to binary output T1 and LED „B“.

2. Connection overcurrent protection I>> to binary output T1 and LED „B“.

Stage I>> tripping must activate binary output T1. This ouput opens cirbuit breaker:

Fig. 5

We use also this binary ouput to measure stage‘s I>> tripping time.

After selecting on left right side „Output Matrix“, add dots to output matrix on right side window as shown in the picture:

Fig. 6

Press button

Fig. 7

to send stage I>> settings to VAMP40 terminal.

Double dot „connected and latched“ means that after stage I>> tripping, binary output T1 and LED „B“ will be in active state. When circuit breaker opens, binary output T1 and LED „B“ still remains in active state. You must reset binary output T1 and LED „B“ 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 „B“ will reset automatically.

3. Stage I>> event list configuration.

Now we are going to configure event list.

After selecting „STAGE EVENT ENABLING“ on left side window, press button

Fig. 8

to download from VAMP40 terminal existing event list settings.

We need to configure stage‘s I>> events, so choose stage‘s I>> events as shown in the picture bellow (by pressing on left side mouse button):

Fig. 9

Send changed settings to VAMP40 terminal by pressing button

Fig. 10

We configured event list for overcurrent stage I>>.

4. CBFP protection configuration.

CBFP means circuit breaker failure protection. All tripping protections (in our course case such protections are ovecurrent stages I> and I>>) must open circuit breaker. If there occurs circuit breaker failure at protection tripping time, CBFP must trip. There must be send trip signal to higher level circuit breaker. In our case – must be send trip signals to incoming and sectional cubicles to open these circuit breakers.

VAMP40 terminal has CBFP protection, but i‘m going to configure CBFP protection by using VAMP40 logic. By using FBD programming language, we can configure protections, intelockings, alarms signals an so on. VAMP40 logic is much simpler than manufacturer‘s ABB (terminals REF545, REF630, RED670) or Siemens (terminals 7SJ63, 7UT, 7SJ82) logics.

In the picture 11 is shown scheme for CBFP:

Fig. 11

We need closed position of circuit breaker and two binary outputs T3 and T4. If circuit breaker‘s failure (circuit breaker remains in closed position, binary input DI1=1) occurs at tripping time of stage I> or stage I>>, after 0,3 sec will be activated binary output T3 (trip signal to incoming cubicle) and binary output T4 (trip signal to sectional cubicle) at the same time instant. CBFP protection also activates also LED „C“.

In event list will be fixed tripping time of protection CBFP.

Open logic window by selecting „Logic“ on left right window:

Fig. 12

On right side window click one time on left mouse button and press „Yes“:

Fig. 13

On right side window click one time left mouse button on logical element „AND“. In opened window „Logic function“ press option „Edit properties“:

Fig. 14

In opened window „Function properties“ on option „General“ select logical „OR“:

Fig. 15

After pressing button „OK“, in logic window logical „OR“ appears:

Fig. 16

On right side window click one time left mouse button on logical element „OR“. In opened window „Logic function“ press option „Select input signals“:

Fig. 17

In opened window „Function IO selection“ on option „Input signals available“ select „I> trip“ ir „I>> trip“:

Fig.18

After pressing button „Add>>“, in window „Selected input signals“ „I> trip“ ir „I>> trip“ signals appears:

Fig. 19

After pressing button „OK“, on right side window you will see connected input signals „I> trip“ and „I>> trip“ to logical element „OR“:

Fig. 20

On right side window click one time on left mouse button and on opened window „Logic View“ press button „Yes“:

Fig. 21

Connect input signal „DI1“ to logical element „AND“:

Fig. 22

Insert another logical element „AND“ and connect to them logical elements „OR“ and „AND“ as shown in the picture:

Fig. 23

On right side window click one time left mouse button on last created logical element „AND“. In opened window „Logic function“ press option „Edit properties“:

Fig. 24

Set setting „TON“(time delay on) on option „Delay settings“ to 300 ms:

Fig. 25

Press button “OK”. Now we have logical element „AND“ with delay function:

Fig. 26

On right side window click one time left mouse button on logical element „Delay“. In opened window „Logic function“ press option „Select outputs“. In opened window „Function IO selection“ on option „Outputs available“ select output signals „Trip relay 3“ , „Trip relay 4“, and „LED C“:

Fig. 27

Press button „Add>>“. Press „OK“.

Now we have own created CBFP logic scheme:

Fig. 28

To send created CBFP configuration to VAMP terminal press button

Fig. 29

Now we need to configure CBFP protection event list.

On left right window select „Logic event enabling“. On right side window „Logic event enabling“ there are 10 free programmable logic events. In the picture 28 we can see that we have one logicl signal „Logic output 1“. And this logic signal we can identify as CBFP protection trip signal. So on right side window „Logic event enabling“ enable logic event 1 and give to this event name „CBFP“:

Fig. 30

Press button

Fig. 31

to send created CBFP event to VAMP terminal.

By selecting „Output matrix “ on left side window, click double dots as shown in the picture:

Fig. 32

Press button

Fig. 33

to send output matrix settings to VAMP terminal.

Configuration of CBFP protection is completed.

5. Overcurrent protection I>> testing.

Testing scheme is shown in the picture 34:

Fig. 34

Here VAMP40 binary output T1 will be used to measure stage‘s I>> tripping time.

Testing results:

Current, A	Time, s	Phases
3,8xIn(19A)	0,08	A-B
3,8xIn(19A)	0,07	A-B
3,8xIn(19A)	0,07	A-B

Current, A	Time, s	Phases
3,8xIn(19A)	0,07	A-C
3,8xIn(19A)	0,08	A-C
3,8xIn(19A)	0,08	A-C

Current, A	Time, s	Phases
3,8xIn(19A)	0,08	B-C
3,8xIn(19A)	0,08	B-C
3,8xIn(19A)	0,08	B-C

Current, A	Time, s	Phases
3,8xIn(19A)	0,08	A-B-C
3,8xIn(19A)	0,07	A-B-C
3,8xIn(19A)	0,07	A-B-C

Stage I>> tripped, LED „B“ active:

Fig. 35

Fig. 36

Event list:

Fig. 37

„Fault log“ of the stage I>> :

Fig. 38

In event list (see picture 37) stages I>> and I>> started, but stage I> didn‘t trip, because stage I>> triped before at 10:01:54.359 (three phase 1-2-3 current 3,8xIn=3,8×800=3040A ).

Stage I>> configured correctly.

6. CBFP protection testing: CBFP to incoming cubicle.

Testing scheme shown in the picture 39:

Fig. 39

CBFP from stage I>, testing results:

Current, A	Time, s	Phases
3,5xIn(17,5A)	0,31	A-B
3,5xIn(17,5A)	0,31	A-C
3,5xIn(17,5A)	0,31	B-C

LED „C“ indicate tripping of CBFP protection:

Fig. 40

Event list of CBFP:

Fig. 41

Tripped CBFP protection correctly? Let‘s analyse event list (see fig. 41). Stage I> triped at 12:48:23.511, after elapsing ~ 0,3 sec CBFP protection triped (12:48:23.819 -12:48:23.511=0,308 sec). CBFP protection triped correctly.

When DI1=0 (circuit breaker opened), CBFP protection didn’t work.

CBFP from stage I>>, testing results: