ДСТУ EN IEC 60255-187-1:2022 Вимірювальні реле та захисне обладнання. Частина 187-1. Функціональні вимоги до диференціального захисту. Обмежений та необмежений диференціальний захист двигунів, генераторів і т...

ДСТУ EN IEC 60255-187-1:2022
(EN IEC 60255-187-1:2021, IDT; IEC 60255-187-1:2021, IDT)

Вимірювальні реле та захисне обладнання. Частина 187-1. Функціональні вимоги до диференціального захисту.
Обмежений та необмежений диференціальний захист двигунів, генераторів і трансформаторів

 
   
 
 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

FOREWORD

1 Scope

2 Normative references

3 Terms and definitions

4 Specification of the function

4.1 General

4.2 Input energizing quantities/energizing quantities

4.2.1 General

4.2.2 Connections

4.3 Binary input signals

4.4 Functional logic

4.4.1 General

4.4.2 Phase biased differential protection

4.4.3 Biased restricted earth fault protection

4.4.4 Compensation of energizing quantities

4.4.5 Additional restraint or blocking methods

4.5 Binary output signals

4.5.1 General

4.5.2 Start (pick-up) signals

4.5.3 Operate (trip) signals

4.5.4 Other output signals

4.6 Additional influencing functions and conditions

4.6.1 General

4.6.2 Operation during CT saturation

4.6.3 Switch onto fault

4.6.4 Energizing quantity failure (CT supervision)

4.6.5 Off-nominal frequency operation

4.6.6 Geomagnetically induced currents (GIC)

5 Performance specification

5.1 General

5.2 Effective and operating ranges

5.3 Steady state accuracy tests in the elective range

5.3.1 General

5.3.2 Test related to the declared thermal withstand current

5.3.3 Basic characteristic accuracy

5.3.4 Ratio compensation accuracy

5.3.5 Phase (vector) compensation validity

5.3.6 Zero sequence compensation validity

5.3.7 Harmonic restraint basic accuracy

5.3.8 Basic accuracy of time delay settings

5.3.9 Disengage time

5.4 Dynamic performance in operating range

5.4.1 General

5.4.2 Typical operate time

5.4.3 Relay stability for external faults

5.4.4 Relay behaviour for internal fault preceded by an external fault

5.5 Stability during magnetizing inrush conditions

5.6 Stability during overexcitation conditions

5.7 Presence of harmonics on load

5.8 Performance during saturation of current transformers

5.9 Behaviour of differential protection with digital interface for the energizing quantities

6 Functional tests

6.1 General

6.2 Test related to the declared thermal withstand current

6.3 Steady state accuracy tests in effective range

6.3.1 General

6.3.2 Basic characteristic accuracy

6.3.3 Ratio (magnitude) compensation accuracy

6.3.4 Phase (vector) compensation validity

6.3.5 Zero sequence compensation validity

6.3.6 Harmonic restraint basic accuracy test under steady state conditions at nominal frequency

6.3.7 Accuracy related to time delay setting

6.3.8 Determination and reporting of the disengage time

6.4 Dynamic performance tests

6.4.1 General

6.4.2 Operate time for double infeed network model (restrained operation)

6.4.3 Operate time for double infeed network model (unrestrained operation)

6.4.4 Operate time for radial single infeed network model (restrained operation)

6.4.5 Operate time for radial single infeed network model (unrestrained operation)

6.4.6 Reporting of typical operate time

6.4.7 Stability for external faults

6.5 Relay behaviour for internal fault preceded by an external fault

6.5.1 General

6.5.2 Application specific considerations: transformer differential

6.5.3 Application specific considerations: biased restricted earth fault

6.5.4 Application specific considerations: generator differential

6.5.5 Reporting

6.6 Stability during inrush conditions

6.6.1 General

6.6.2 Application specific considerations: transformer differential

6.7 Stability during overexcitation conditions

6.7.1 General

6.7.2 Application specific considerations: transformer differential

6.8 Performance with load harmonics

6.8.1 General

6.8.2 Application specific considerations: transformer differential

6.8.3 Application specific considerations: generator or motor differential

6.8.4 Application specific considerations: biased restricted earth fault

6.8.5 Reporting

7 Documentation requirements

7.1 Type test report

7.2 Other user documentation

Annex A (informative) Examples of phase (vector) compensation and zero sequence compensation schemes

A.1 General

A.2 Y→d conversion

A.2.1 Current conversion

A.2.2 Three-phase fault at Y (star/wye) side

A.2.3 Phase-phase fault at Y (star/wye) side

A.2.4 Single-phase fault at Y (star/wye) side

A.2.5 Three-phase fault at delta side

A.2.6 Phase-phase fault at delta side

A.2.7 Single-phase fault at delta side

A.2.8 Ratio between start currents under different fault types

A.3 d→Y conversion

A.3.1 Current conversion

A.3.2 Three-phase fault at Y (star/wye) side

A.3.3 Phase-phase fault at Y (star/wye) side

A.3.4 Single-phase fault at Y (star/wye) side

A.3.5 Three-phase fault at delta side

A.3.6 Phase-phase fault at delta side

A.3.7 Single-phase fault at delta side

A.3.8 Ratio between start currents under different fault types

Annex B (normative) Calculation of mean, median and mode

B.1 Mean

B.2 Median

B.3 Mode

B.4 Example

Annex C (normative) CT requirements

C.1 General

C.2 Transformer differential protection

C.2.1 General

C.2.2 Fault 1

C.2.3 Fault 2

C.2.4 Fault 3

C.3 Transformer restricted earth fault protection

C.3.1 General

C.3.2 Fault 1

C.3.3 Fault 2

C.3.4 Fault 3

C.4 Generator differential protection

C.4.1 General

C.4.2 Fault 2

C.4.3 Criteria and additional conditions

C.5 Motor differential protection

C.5.1 General

C.5.2 Fault 1

C.5.3 Criteria and additional conditions

C.5.4 Start of motor, security case

C.5.5 Criteria and additional conditions

C.6 Reporting

Annex D (informative) CT saturation and influence on the performance of differential relays

Annex E (informative) Guidance on dimensioning of CTs for transformer differential protection

E.1 General

E.2 Example 1

E.2.1 General

E.2.2 Verification of CT1 - Internal fault

E.2.3 Verification of CT1 - External fault

E.2.4 Verification of CT2

E.3 Example 2

E.3.1 General

E.3.2 Dimensioning of CT1

E.3.3 Dimensioning of CT2

Annex F (informative) Examples of test procedures to determine CT sizing requirements for differential protection

F.1 General

F.2 Test data

F.2.1 General

F.2.2 Network model for CT requirement tests for the transformer differential protection

F.2.3 Network model for CT requirement tests for the transformer restricted earth fault protection

F.3 CT data and CT models

F.4 Test summary

Annex G (normative) Ramping methods for testing basic characteristic accuracy

G.1 General

G.2 Pre-fault condition

G.3 Pseudo-continuous ramp

G.4 Ramp of shots

Annex H (informative) Example of COMTRADE file for an evolving fault test case

Annex I (normative) Definition of fault inception angle

Bibliography