More detail how to insert function blocks, variables, how to set types of variables, how to use various tools of configuration and setting read in previous articles no. 7÷18.

Various blockings

1. Circuit breaker can not be closed if:
1. Earth switch is closed.
2. Some of the protections tripped. Only after resetting of tripped protection there will be able to close circuit breaker.
3. Syncrocheck is failed (if electrical grid should be connected to another grid).

I‘m going to create configuration of blocking of earth switch and configuration of blocking of tripped protection.

Blocking of synchrocheck will be shown in separate article „Synchrocheck“.

The configuration will be created by using „Relay Configuration Tool“ application.

More about logical blocks you can read in manufacturer‘s ABB manual „Generic Base Elements 1MRS752371-MUM“.

2. Creating of configuration of earth switch positions:

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3. Another condition – there are  activated tripped protections:

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Variable “LED_Alarm” indicates that one of the 3 LEDs is not resetted:

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Until one of the three LEDS of tripped protections (variable LED_Alarm) is not resetted and earth switch is closed (variable Earth_Sw_On is active), the variable Close_CB_Enabled will be not active (logical „0“) and at input „CLOSEENA“ of function block COCB1 will be logical „0“:

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Until at input „CLOSEENA“ of function block COCB1 will be logical „0“, closing of circuit breaker will be blocked:

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When earth switch is opened and there aren‘t tripping protections (variable “LED_Alarm” is not active), there will be logical „1“ at input „CLOSEENA“ of function block COCB1. In this case circuit breaker can be closed.
I‘m using RS flip-flop in configuration.

When at input „SET1“ will be logical „1“, while at input „RESET“ – logical „0“, then at output „Q1“ will be logical „1“.
When at input „SET1“ will be  logical „1“, while at input „RESET“ – logical „1“, then at output „Q1“ will be logical „0“.

I‘ve inverted input „RESET“, so when variable LED_Alarm is active (logical „1“), it is inverting to logical „0“ and at input „RESET“ will be logical „0“ while at ouput „Q1“ – logical „1“.

4. Configuration is completed. By using command „MAKE-MAKE“ you should compile the configuration.

 

 

5. Now you need to send configuration and settings to PLC REF543.

How to send configuration and settings of function blocks to PLC REF543 read article no. 10“ Measurements: downloading (sending) configuration and settings to PLC REF543“.

CBFP function with control of current

In article no.17 „CAP505 – CBFP protection: configuration and testing“ is described CBFP function with control of position of circuit breaker. If circuit breaker is not opened while tripping of protection, the CBFP signal is forced to circuit breaker of higher level of elektrical network.

1. In this chapter of article I‘ll describe CBFP function with control of current: if circuit breaker is not opened while tripping of protection also should be circulating  current (for example 275 A). If magnitude of current will be below 275 A, then CBFP function will be blocked.

The configuration will be created by using „Relay Configuration Tool“ application.

More about logical blocks you can read in manufacturer‘s ABB manual „Generic Base Elements 1MRS752371-MUM“.

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2. It is clear that variable “NOCCBFP” will be active only when all these conditions will be fulfilled:

1) NOC3Hich or NOC3Inst signals „CBFP“ are active
2) Circuit breaker is closed
3) Output „Start“ of function block NOC3Low is active

3. Configuration is completed. By using command „MAKE-MAKE“ you should compile the configuration.

4. Parameters of function blocks NOC3Low are selected by using „Relay setting tool“ application:

Since rate of current transformers is 2500/5 A, the magnitude of current is 275A/2500=0.11 (here 275 A is setting of current for CBFP function). This value (275 A) write at parameter “Start current”:

Setting group 1:

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Setting group 2:

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Here parameter „Definite time“ – characteristic of current curve: tripping time is independent from magnitude of current; when current reaches setting 0,11xIn, after elapsing time=0,05s will be activated output „Start“ of function block NOC3Low.

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5. Now you need to send configuration and settings to PLC REF543.

How to send configuration and settings of function blocks to PLC REF543 read article no. 10“ Measurements: downloading (sending) configuration and settings to PLC REF543“.

Using clocking of control signal

In articles no.5-21 all signals of control were permanent (in the manner of timing). It is not good because for example by tripping of protection NOC3High signal NOCHighTrip is activated (see article no. 18 “ CAP505: configuration of control and testing tripping time of protections“).

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This signal (NOCHighTrip) force to trip binary output PS1_4_HSPO1. This output supply opening electromagnet of circuit breaker. By opening circuit breaker the supply will be break through normal-open(NO) auxiliary contact of circuit breaker. But binary output PS1_4_HSPO1 is still active:

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The binary output PS1_4_HSPO1 will be resetted after resetting protection NOC3High manually. So it is convenient to use time pulse signals of control. After elapsing of this time pulse the protection NOC3High will be resetted automatically. Such signals are used in many cases, for examples in logical schemes of substation automation.

 

1. The function block “TP” (Time Pulse) is used to clock signals of control.
The configuration is created by using „Relay Configuration Tool“ application.
2. Example of configuration.

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By tripping of protections (NOC3High, NOC3Inst or NOCCBFP) the outputs „TRIP“ will be activated. This signal will be injected to input „IN“ of function block “TP”. Time clock 0.6s is set to input „PT“ of function block “TP”. When at input „IN“ will be logical „1“, at output „Q“ will also be logical „1“ (variables NOCHighTrip, NOCInstTrip and NOCCBFP are active). After elapsing of time = 0.6 s at output „Q“ logical „1“ will be inverted to logical „0“ (at this time variables NOCHighTrip, NOCInstTrip and NOCCBFP are not active). So function block TP is simple pulse timer.

4. In timing diagram you can explore clocking signals:

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More about logical blocks you can read in manufacturer‘s ABB manual „Generic Base Elements 1MRS752371-MUM“.

5.The configuration is completed. By using command „MAKE-MAKE“ you should compile the configuration.

Leave parameters of function block “TP” as defaults (see „„Relay Settings Tool““).

6. Now you need to send configuration and settings to PLC REF543.

How to send configuration and settings of function blocks to PLC REF543 read article no. 10 “ Measurements: downloading (sending) configuration and settings to PLC REF543“.

Configuration of spare binary outputs for time testing of tripping protections

1.It is convenient to configure spare binary outputs for time testing of tripping protections. In this case you don‘t need to touch existing circuits of relaying protection.

The configuration is created by using „Relay Configuration Tool“ application.

2. Example of the configuration.

You can configure „Start“ signals of protections (variables NOCHighStart, NOCInstStart) to force binary output BIO1_5_SO1:

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„Trip“ signals of protections (variables NOCHighTrip, NOCInstTrip) can be configured to force binary output BIO1_5_SO2:

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I recommend CBFP function to configure to separate binary output BIO1_5_SO4:

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Why? Because timing of CBFP protection begins counting at instant of tripping protections NOC3High or NOC3Inst. If protections NOC3High, NOC3Inst or CBFP will be configured to the same binary output, then you can‘t measure time of tripping CBFP.

 

Timing diagram illustrate measuring of CBFP timing:

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3.The completed configuration:

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4. The configuration is completed. By using command „MAKE-MAKE“ you should compile the configuration.

5. Now you need to send configuration and settings to PLC REF543.

How to send configuration and settings of function blocks to PLC REF543 read article no. 10 “ Measurements: downloading (sending) configuration and settings to PLC REF543“.

In the next article I’m going to describe substation automation.