Iec 60255 127 2010

characteristic quantity which identify the maximum and minimum operate times corresponding to each value of the duration of the time interval between the instant when the characteristic

General

The protection function, including its inputs, outputs, measuring elements, time delay characteristics, and functional logic, is illustrated in Figure 1 The manufacturer is required to supply the functional block diagram for the specific implementation.

Figure 1 – Simplified protection function block diagram

Input energising quantities/Energising quantities

Input energizing quantities, such as voltages, serve as measuring signals and are governed by the ratings and standards outlined in IEC 60255-1 These quantities can be transmitted via wires from voltage transformers or as data packets through a communication port, utilizing suitable communication protocols like IEC 61850-9-2.

The energizing quantities utilized by the protection function do not have to be the voltage measured on the secondary side of the voltage transformers Consequently, the documentation for the measuring relay must specify the type of energizing quantities employed by the protection function.

• three phase voltage (phase to phase or phase to earth) measurement;

• neutral to earth voltage or residual voltage measurement;

• positive, negative or zero sequence voltage measurement

The type of measurement of the energising quantity shall be stated Examples are:

• RMS value of the signal;

LICENSED TO MECON LIMITED - RANCHI/BANGALORE, FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU.

• RMS value of the fundamental component of the signal;

• RMS value of a specific harmonic component of the signal;

• peak values of the signal;

• instantaneous value of the signal.

Binary input signals

Any binary input signals, whether driven externally or internally, must be clearly represented in the functional logic diagram to illustrate their impact on the protection function Supplementary textual descriptions can be included to enhance understanding of the input signals and their intended applications.

Functional logic

Operating characteristics

The relationship between operating time and characteristic quantity is represented by a characteristic curve, which is defined by the manufacturer through an equation or graphical representation.

This standard specifies two types of characteristics:

• independent time characteristic (i.e definite time delay);

• dependent time characteristic (i.e inverse time delay)

The time characteristic refers to the operational time, which is the interval between when the input energizing quantity exceeds the set value (G S) and when the relay activates.

The independent time characteristic is defined by the setting value of the characteristic quantity \( G_S \) and the operating time \( t_{op} \) In the absence of any intentional time delay, the independent time relay is referred to as an instantaneous relay.

For overvoltage relays, t (G) = t op when G > G S The independent time characteristic is presented in Figure 2

Figure 2 – Overvoltage independent time characteristic

For undervoltage relays, t (G) = t op when G < G S The independent time characteristic is presented in Figure 3

Figure 3 – Undervoltage independent time characteristic

For overvoltage protection, the characteristic curves of dependent time relays shall follow a law of the form:

G G t G T (1) where: t (G) is the theoretical operate time with constant value of G in seconds;

T is the time setting (theoretical operate time for G = 2×G S );

G is the measured value of the characteristic quantity;

G S is the setting value (see 3.3)

This dependent time characteristic is shown in Figure 4

Figure 4 – Dependent time characteristic for overvoltage protection

The effective range for the characteristic quantity of the dependent time portion of the curve is between 1.2 × G S and G D, with G D being specified by the manufacturer as the upper limit of the setting range.

For undervoltage protection, the characteristic curves of dependent time relays shall follow a law of the form:

G t G T (2) where: t (G) is the theoretical operate time in seconds with constant value of G;

T is the time setting (theoretical operate time for G = 0);

G is the measured value of the characteristic quantity;

G S is the setting value (see 3.3)

This dependent time characteristic is shown in Figure 5

Figure 5 – Dependent time characteristic for undervoltage protection

The effective range of the dependent time portion of the characteristic quantity shall lie between 0 and G S

Power system faults can lead to fluctuating voltages To maintain effective coordination among time-dependent relays during these conditions, the relay behavior must align with the integration outlined in Equation 3.

For G > G S (overvoltage protection) or G < G S (undervoltage protection):

T 0 is the theoretical operate time where G varies with time; t(G) is the theoretical operate time with constant value of G in seconds;

G is the measured value of the characteristic quantity

Operate time is defined as the time instant when the integral in Equation 3 becomes equal to or greater than one

Reset characteristics

Manufacturers must define the relay resetting characteristics to help users understand its behavior during repetitive intermittent faults or faults that occur in quick succession The recommended reset characteristics are outlined below.

4.4.2.2 No intentional delay on reset

Undervoltage relays will return to their reset state without intentional delay when the condition \( G > (\text{reset ratio}) \times G_S \) is met This reset functionality is applicable to both dependent and independent time relays.

For overvoltage relays, when the condition \( G < (\text{reset ratio}) \times G_S \) is met, the relay will promptly return to its reset state without any intentional delay This reset functionality is applicable to both dependent and independent time relays.

The reset feature is relevant for both overvoltage and undervoltage protection, with a specific focus on the definite time reset mechanism for overvoltage protection, which operates under the same principle as undervoltage protection.

For values of G less than the product of the reset ratio and G S, the relay will revert to its reset state following a user-specified reset time delay, denoted as t r Throughout this reset period, the element will maintain its defined state value.

During the transient period \( t_P \), when the characteristic quantity \( G \) exceeds the threshold \( G_S \), the reset timer \( t_r \) is immediately reset to zero Consequently, the element resumes normal operation from the retained value.

Following G > G S for a cumulative period causing relay operation, the relay shall maintain its operated state for the reset time period after the operating quantity falls below G S as shown in

Figure 6 Alternatively, the relay may return to its reset state with no intentional delay as soon as the operating quantity falls below G S after tripping as shown in Figure 7

The reset option is applicable to both dependent and independent time elements, as illustrated in Figures 6 and 7, which depict the partial and complete operation of the element.

LICENSED TO MECON LIMITED - RANCHI/BANGALORE, FOR INTERNAL USE AT THIS LOCATION ONLY, SUPPLIED BY BOOK SUPPLY BUREAU. t r t r t r

Tripping Value of internal time delay counter

Figure 6 – Definite time reset characteristic t r t r t r

Tripping Value of internal time delay counter

Figure 7 – Definite time reset characteristic (alternative solution with instantaneous reset after relay operation)

Binary output signals

Start (pick-up) signal

The start signal, generated by measuring and threshold elements, is provided without any intentional time delay In the absence of a start signal, manufacturers must supply guidance on conducting tests related to the start signal as outlined in Clause 6.

Operate (trip) signal

The operate signal is generated by measuring and threshold elements following a specified intentional operating time delay For instantaneous elements, this signal can occur simultaneously with the start signal, if applicable.

Other binary output signals

Any available binary output signals must be clearly illustrated in the functional logic diagram, with their operational methods detailed Additional textual descriptions can be included to enhance understanding of the output signal's functionality and intended application.

Accuracy related to the characteristic quantity

For both independent and dependent time relays, the accuracy and the reset ratio related to the characteristic quantity shall be declared by the manufacturer

For both dependent and independent time relays, the manufacturer shall declare the accuracy related to the characteristic quantity along with a setting value range over which it is applicable.

Accuracy related to the operate time

For independent time relays, the maximum permissible error of the specified operate time shall be expressed as either:

• a percentage of the time setting value, or;

• a percentage of the time setting value, together with a fixed maximum time error

(where this may exceed the percentage value), whichever is greater For example, ±5 % or ±20 ms whichever is greater, or;

For dependent time relays, the manufacturer specifies a reference limiting error, which is defined as an assigned error In relays featuring a decreasing time function, this assigned error is expressed as a percentage of the theoretical time at the maximum limit of the effective range of the dependent time characteristic (G D) The reference limiting error must be clearly stated.

The theoretical curve of time is plotted against multiples of the characteristic quantity's setting value, constrained by two curves that represent the maximum and minimum limits of the limiting error within the effective range of the dependent time portion of the characteristic.

• an assigned error claimed for the effective range of the dependent time portion of the characteristic of the characteristic quantity

Manufacturers must specify the maximum limiting error associated with the operate time for both dependent and independent time relays, as well as the applicable setting range of time delay.

The manufacturer must specify whether the internal measurement time of the characteristic quantity and the output contact operation time are included in the time delay setting or if they are additional to it.

Accuracy related to the reset time

For relays with no intentional reset delay, the manufacturer shall declare the reset time of the element

For relays with a definite time delay on reset, the maximum permissible error of the specified reset time shall be expressed as either:

• a percentage of the reset time setting value, or;

• a percentage of the reset time setting value, together with a fixed maximum time error

(where this may exceed the percentage value), whichever is greater For example, ±5 % or ±20 ms whichever is greater, or;

The manufacturer shall declare the maximum limiting error related to the reset time along with a setting range of time delay over which it is applicable

The manufacturer shall declare if the internal measurement time (disengaging time) is included in the reset time setting or it is in addition to the reset time setting.

Transient performance

Overshoot time

The manufacturer shall declare the overshoot time.

Response to time varying value of the characteristic quantity

To guarantee effective coordination with dependent time relays, it is essential to test relay performance under time-varying fault conditions, where the characteristic quantity changes over time The manufacturer must disclose any additional errors, which should not exceed 15%.

Voltage transformer requirements

The manufacturer shall declare the types of the voltage transformers required to maintain the claimed performance levels (refer to IEC 60044 series standards)

General

Type tests for over/under voltage protection relays are designed to thoroughly evaluate all hardware and firmware components This involves injecting voltage directly into the relay's conventional voltage transformer input terminals or using an equivalent signal at the appropriate interface Additionally, operations should be conducted from output contacts whenever feasible, or through equivalent signals at the relevant interface.

In cases where measuring results from signal input to output is not feasible, the manufacturer must specify the application point of the characteristic quantity and the signal interface used for measurement For relays with settings in primary values, a single voltage transformer ratio may be chosen for conducting tests.

To assess the relay's accuracy under steady state conditions, a sinusoidal signal at the rated frequency must be injected, with its magnitude adjusted based on the testing requirements.

To optimize the testing process, certain tests can be combined based on the relay technology being evaluated It may be feasible to decrease the number of test points due to the limited range and step-size of the available settings If the exact test point cannot be achieved, the nearest available setting should be utilized.

The test settings are defined as a percentage of the available range, where 0% indicates the minimum setting and 100% signifies the maximum A setting of 50% corresponds to the midpoint of this range The specific setting can be determined using a designated formula.

S AV = (S MAX – S MIN )⋅X + S MIN where

S AV is the actual setting value to be used in test;

S MAX is the maximum available setting value;

S MIN is the minimum available setting value;

X is the test point percentage value expressed in test methodology (see Tables 1, 2, 3, and 4)

For example, for the operating voltage setting in Table 1, assuming the available setting range is 60 V to 180 V, the actual operating voltage settings to be used would be: 60 V;

Determination of steady state errors related to the characteristic quantity

Accuracy of setting (start) value

In order to determine the accuracy of the setting value (G S ) the characteristic quantity

(magnitude) should be varied slowly and the start output of the element monitored for operation

For overvoltage protection, the characteristic quantity shall be increased according to the criteria below:

• the initial value of the characteristic quantity shall be below the setting value by at least two times the specified accuracy of the element;

• the ramping steps shall be at least ten times smaller than the accuracy specified for the element;

• the step time shall be at least two times the specified start time and not more than five times the specified start time

If the setting value is 100 V, accuracy ±10 % and start time 20 ms, the initial ramp start value is 80 V, ramp step size of 1 V with a step time of (40 – 100) ms

For effective undervoltage protection, the characteristic quantity must be reduced from an initial value exceeding the start value by at least twice the specified accuracy of the component This ramping process mirrors that of overvoltage protection.

To effectively evaluate performance across the entire range of an element, it is essential to utilize a sufficient number of test points, with a minimum of ten settings recommended Emphasis should be placed on lower start settings, where errors tend to be more pronounced The preferred test values include: the minimum setting (0% of the range), 0.5%, 1%, 2%, 3%, 5%, 10%, 30%, 60%, and the maximum setting (100% of the range).

For testing overvoltage and undervoltage relays, it is essential to conduct each test point a minimum of five times to guarantee consistent results The accuracy claim is based on the maximum and average error values obtained from all tests performed.

Reset ratio determination

To determine the reset ratio, the element must be operated under forced conditions while gradually varying the characteristic quantity and monitoring the output without intentional reset delays For effective overvoltage protection, the characteristic quantity should be reduced based on the specified criteria.

• the initial value of the characteristic quantity shall be above the start value by at least two times the specified accuracy of the element;

• the ramping steps shall be at least ten times smaller than the accuracy specified for the element;

• the step time shall be at least two times the specified disengaging time and not more than five times the specified disengaging time

If reset does not occur within the time interval, the element is considered to have not reset and, the next lower value of voltage shall be used

If the setting value is 100 V, accuracy ±10 % and disengaging time 20 ms, the initial ramp start value is 120 V, ramp step size of 1 V with a step time of (40 to 100) ms

For effective undervoltage protection, the characteristic quantity must be increased from an initial value below the starting threshold by at least double the specified accuracy of the component This ramping process closely resembles that used in overvoltage protection.

The reset ratio shall be calculated as follows:

To effectively evaluate performance across the entire range of an element, it is essential to utilize a sufficient number of test points, with a minimum of ten settings recommended Emphasis should be placed on lower start settings, where errors tend to be more pronounced The preferred test values include the minimum setting (0% of the range), followed by 0.5%, 1%, 2%, 3%, 5%, 10%, 30%, 60%, and the maximum setting (100% of the range).

For overvoltage relays, it is essential to conduct each test point a minimum of five times to guarantee result repeatability, utilizing the minimum and average values from all tests to substantiate the accuracy claim.

For testing an undervoltage relay, it is essential to conduct each test point a minimum of five times to guarantee result repeatability The accuracy claim will be based on the maximum and average values obtained from all tests.

Determination of steady state errors related to the start and operate time

To assess the steady state errors of the operate time, voltage must be applied to the relay without any intentional delay, while monitoring the start and operate output contacts of the element The voltage switching point should occur at the zero crossing of the waveform, and tests should be performed on a single phase basis.

To accurately evaluate performance across the entire time delay setting range and various operating voltage values, it is essential to utilize an adequate number of test points Each test point should be assessed multiple times, with a minimum of five repetitions, to guarantee result repeatability The outcomes should include both the maximum and average values from these five attempts.

This document is licensed to Mecon Limited for internal use at the Ranchi/Bangalore location, supplied by Book Supply Bureau The recorded times for the operate output contact will assess the accuracy of operating time, while the times for the start output contact will measure the element's start time Suggested test points include Table 1 for overvoltage and Table 2 for undervoltage elements.

Table 1 – Test points for overvoltage elements

Time setting Operating voltage setting

Maximum (100 %) Maximum (100 %) Zero 2 × G S a The end test voltage value shall be limited to the maximum withstand voltage

Table 2 – Test points for undervoltage elements

Time setting Operating voltage setting Initial test voltage value b End test voltage value

Some relays may prevent the undervoltage element from operating when the injected voltage is zero or below a certain threshold In such instances, zero test cases should be substituted with tests conducted at the minimum voltage threshold Additionally, the initial test voltage must not exceed the maximum withstand voltage.

Determination of steady state errors related to the reset time

To assess the steady state errors of the reset time, voltage must be applied to the relay to initiate operation Once the operation is complete, the voltage should be returned to the initial test value for one second before transitioning to the final test voltage without any intentional delay, while monitoring a suitable output contact of the element If an output contact is unavailable, the procedure outlined in Annex A can be utilized to determine the relay's reset time.

To accurately evaluate performance across the entire reset time setting range and various operating voltage values, it is essential to utilize sufficient test points Each test point should be repeated a minimum of five times to ensure result repeatability, with the maximum and average values from these attempts used for analysis Monitoring the start contact will yield a measure of the disengaging time, while additional signals will assess the accuracy of the reset time Suggested test points can be found in Table 3 for overvoltage elements and Table 4 for undervoltage elements.

Table 3 – Test points for overvoltage elements

Reset time setting b Operating voltage setting

The initial test voltage must not exceed the maximum withstand voltage, and the first column does not apply to relays that do not have an intentional reset delay.

Table 4 – Test points for undervoltage elements

Reset time setting b Operating voltage setting

The end test voltage must not exceed the maximum withstand voltage Note that the first column does not apply to relays without an intentional reset delay Additionally, certain relays may prevent the undervoltage element from operating when the injected voltage is zero or below the threshold; in such instances, zero test cases should be substituted with tests at the minimum voltage threshold.

Determination of transient performance

Overshoot time for undervoltage protection

This subclause describes the test for overshoot time for undervoltage protection function The overshoot time is generally not relevant for overvoltage function

At reference conditions with the relay set to nominal voltage, the voltage will be adjusted from 1.2 × G S to 0.8 × G S The maximum relay operation time will be recorded from five attempts This measured operating time will then be used for further voltage adjustments.

The voltage should be reduced from 1.2 × G S to 0.8 × G S for a duration of 5 ms less than the maximum operating time, followed by an immediate increase back to 1.2 × G S If the relay activates, the voltage removal time must be shortened by an additional 5 ms, and the test should be repeated This process continues, decreasing the voltage removal time until five consecutive removals do not trigger the relay.

The difference in time between the voltage removal period and the measured relay operate time is the relay overshoot time.

Response to time varying value of the characteristic quantity for

The test waveform of the characteristic quantity is shown in Figure 8, which represents a

50 Hz or 60 Hz waveform modulated by a square wave so that the changes in magnitude of the sine-wave occur at zero crossings

The modulating square-wave frequency must be limited to no more than 1/10 of the main frequency to ensure that the relay's transient behavior does not impact its operating time.

The magnitudes G1 and G2 of the characteristic quantity exceed the setting value GS These magnitudes are chosen to ensure that the relay's operate time is significantly longer than the period of the modulating square wave.

With the above conditions, the theoretical operate time T 0 is:

T 1 is the operate time for characteristic quantity equal to G 1;

T 2 is the operate time for characteristic quantity equal to G 2

Recommended values for the time varying characteristic quantity are given in Table 5, where the frequency of the modulating square-wave is 1/10 of the main frequency With values of

Table 5, the measured operate time shall not differ from T 0 by more than 15 %

Table 5 – Recommended values for the test

NOTE T is the time delay setting (see Equations (1) and (2))

Type test report

The type test report for the functional elements described in this standard shall be in accordance with IEC 60255-1 As a minimum the following aspects shall be recorded:

• equipment under test: this includes details of the equipment / function under test as well as specific details such as model number, firmware version shall be recorded as applicable;

• test equipment: equipment name, model number, calibration information;

• functional block diagram showing the conceptual operation of the element including interaction of all binary input and output signals with the function;

• details of the input energising quantity and the type of measurement being used by the function;

• details of the available characteristic curves/operation for both operating and reset states that have been implemented in the function, preferably by means of an equation;

• details of the behaviour of the function for voltages in excess of G D , and its value;

This article outlines the specific algorithms implemented to enhance the functionality of power systems, detailing their performance claims For generic algorithms utilized across multiple functions, such as voltage transformer supervision, a single description of the algorithm's operation is provided in the user documentation Additionally, the impact of these algorithms on the performance of all related functions is thoroughly explained.

The test method and settings encompass the specifics of the testing procedure and the configurations applied to the equipment being evaluated These settings may extend beyond those relevant to the function under examination, ensuring that repeat tests can be conducted with assurance that identical conditions are maintained throughout the testing process.

Test results are meticulously documented for each test case specified in the testing method and settings, including a reference to the specific test case These comprehensive results are essential for establishing accuracy claims.

• test conclusions: based upon the recorded test results, all claims required by Clause

The standard must clearly outline five key points When applicable, these claims will be compared against the performance specifications in the standard, enabling both individual pass/fail assessments and an overall pass/fail determination for the entire function.

Other user documentation

Many users do not need to access the entire type test documentation but only require specific information Therefore, essential aspects should be included in user documentation, even if they are not consolidated into a single document.

• functional block diagram showing the conceptual operation of the element including interaction of all binary input and output signals with the function;

• details of the input energising quantity and the type of measurement being used by the function;

• details of the available characteristic curves/operation for both operating and reset states that have been implemented in the function, preferably by means of an equation;

• details of the behaviour of the function for voltages in excess of G D , and its value;

This article outlines the specific algorithms implemented to enhance the functionality of power systems, detailing their performance claims For generic algorithms utilized across multiple functions, such as voltage transformer supervision, a single description of the algorithm's operation is provided in the user documentation Additionally, the impact of these algorithms on the performance of all related functions is thoroughly explained.

• all claims required by Clause 5 of this standard shall be clearly stated

Reset time determination for relays with trip output only

Measuring relays and protection equipment feature various output configurations For devices with a single trip output, determining a dependent reset time can be accomplished through multiple methods This article presents an example of one such testing method.

To determine the reset time for relays lacking an appropriate contact, a method can be employed to achieve basic accuracy First, a voltage of twice the setting (or the maximum allowed if this exceeds the maximum) is applied to the relay for a specified duration, ensuring the unit does not operate while reaching 90% of its trip value Subsequently, the voltage is instantaneously reduced to a predetermined level below the setting for a fixed period After this duration, the voltage is increased instantaneously to twice the setting value until the element trips The trip time is then calculated based on the internal integrator's value, as illustrated in the accompanying figure.

The test method involves reducing the applied voltage to different values during each iteration, resulting in a variety of trip times From these trip times, reset times can be extrapolated, allowing for the creation of a reset curve when sufficient data points are collected.

Figure A.1 – Dependent reset time determination

IEC 60050-447:2010, International Electrotechnical Vocabulary – Part 447: Measuring relays

IEC 61850 (all parts), Communication networks and systems for power utility automation

IEC 61850-7-4, Communication networks and systems for power utility automation – Part 7-4:

Basic communication structure – Compatible logical node classes and data object classes

IEC 61850-9-2, Communication networks and systems for power utility automation – Part 9-2:

Specific Communication Service Mapping (SCSM) – Sampled values over ISO/IEC 8802-3

IEEE Std C37.2-2008, IEEE Standard Electrical Power System Device Function Numbers,

4.2 Grandeurs d'alimentation d'entrée / Grandeurs d'alimentation 32

4.5.1 Signal de démarrage (pick-up) 38

4.5.3 Autres signaux de sortie binaires 39

5.1 Précision relative à la grandeur caractéristique 39

5.2 Précision relative au temps de fonctionnement 39

5.3 Précision relative au temps de retour 40

5.4 Performances en régime de transitoires 40

5.4.2 Réponse à la variation de valeur temporelle de la grandeur caractéristique 40 5.5 Exigences relatives aux transformateurs de tension 40

6.2 Détermination des erreurs en régime établi relatives à la grandeur caractéristique 41

6.2.1 Précision de la valeur de réglage (démarrage) 41

6.2.2 Détermination du rapport de retour 42

6.3 Détermination des erreurs en régime établi relatives aux temps de démarrage et de fonctionnement 43

6.4 Détermination des erreurs en régime établi relatives au temps de retour 43

6.5 Détermination des performances en transitoires 44

6.5.1 Temps de dépassement pour une protection à minimum de tension 44

6.5.2 Réponse à la variation de valeur temporelle de la grandeur caractéristique pour les relais à temps dépendant 45

Annexe A (informative) Détermination du temps de retour pour les relais ayant seulement une sortie de déclenchement 48

Figure 1 – Schéma synoptique simplifié de la fonction de protection 32

Figure 2 – Caractéristique à temps indépendant à maximum de tension 33

Figure 3 – Caractéristique à temps indépendant à minimum de tension 34

Figure 4 – Caractéristique à temps dépendant pour une protection à maximum de tension 35

Figure 5 – Caractéristique à temps dépendant pour une protection à minimum de tension 36

Figure 6 – Caractéristique de retour à temps indépendant 38

Figure 7 – Caractéristique de retour à temps indépendant (solution alternative avec retour instantané après le fonctionnement du relais) 38

Figure A.1 – Détermination du temps de retour à temps dépendant 48

Tableau 1 – Points d'essai pour les éléments à maximum de tension 43

Tableau 2 – Points d'essai pour les éléments à minimum de tension 43

Tableau 3 – Points d'essai pour les éléments à maximum de tension 44

Tableau 4 – Points d'essai pour les éléments à minimum de tension 44

RELAIS DE MESURE ET DISPOSITIFS DE PROTECTION –

Partie 127: Exigences fonctionnelles pour les protections à minimum et maximum de tension

The International Electrotechnical Commission (IEC) is a global standardization organization comprising national electrotechnical committees Its primary goal is to promote international cooperation on standardization issues in the fields of electricity and electronics To achieve this, the IEC publishes international standards, technical specifications, technical reports, publicly accessible specifications (PAS), and guides, collectively referred to as "IEC Publications." The development of these publications is entrusted to study committees, which allow participation from any interested national committee Additionally, international, governmental, and non-governmental organizations collaborate with the IEC in its work The IEC also works closely with the International Organization for Standardization (ISO) under conditions established by an agreement between the two organizations.

Official decisions or agreements of the IEC on technical matters aim to establish an international consensus on the topics under consideration, as each study committee includes representatives from the relevant national IEC committees.

The IEC publications are issued as international recommendations and are approved by the national committees of the IEC While the IEC makes every reasonable effort to ensure the technical accuracy of its publications, it cannot be held responsible for any misuse or misinterpretation by end users.

To promote international consistency, the national committees of the IEC commit to transparently applying IEC publications in their national and regional documents as much as possible Any discrepancies between IEC publications and corresponding national or regional publications must be clearly stated in the latter.

The IEC does not issue any conformity certificates itself Instead, independent certification bodies offer conformity assessment services and, in certain sectors, utilize IEC conformity marks The IEC is not responsible for any services provided by these independent certification organizations.

6) Tous les utilisateurs doivent s'assurer qu'ils sont en possession de la dernière édition de cette publication

No liability shall be attributed to the IEC, its directors, employees, agents, including its special experts and members of its study committees and national committees, for any injury or damage, whether direct or indirect, or for bearing costs (including legal fees) and expenses arising from the publication or use of this IEC Publication or any other IEC Publication, or for the credit given to it.

8) L'attention est attirée sur les références normatives citées dans cette publication L'utilisation de publications référencées est obligatoire pour une application correcte de la présente publication

Attention is drawn to the fact that some elements of this IEC publication may be subject to intellectual property rights or similar rights The IEC cannot be held responsible for failing to identify such property rights or for not indicating their existence.

La norme internationale CEI 60255-127 a été préparée par le comité technique 95 de la CEI:

Relais de mesure et dispositifs de protection

Le texte de cette norme est issu des documents suivants:

Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant abouti à l'approbation de cette norme

Cette publication a été rédigée selon les Directives ISO/CEI, Partie 2

A list of all parts of the IEC 60255 series, published under the general title Relais de mesure et dispositifs de protection, can be found on the IEC website

The committee has determined that the content of this publication will remain unchanged until the stability date specified on the IEC website At that time, the publication will be updated accordingly.

• remplacée par une édition révisée, ou

RELAIS DE MESURE ET DISPOSITIFS DE PROTECTION –

Partie 127: Exigences fonctionnelles pour les protections à minimum et maximum de tension

This section of IEC 60255 outlines the minimum requirements for voltage maximum/minimum relays The standard includes specifications for protection functions, measurement characteristics, and timing features.

This standard outlines the influencing factors that affect accuracy under steady-state conditions and the performance characteristics in dynamic conditions It also includes testing methodologies to verify performance characteristics and accuracy.

Les fonctions "maximum/minimum de tension" couvertes par la présente norme sont les suivantes:

IEEE/ANSI C37.2 Codes de fonction

Protection à minimum de tension phase

27 PTUV Protection à minimum de tension directe

27D PTUV Protection à maximum de tension phase

59 PTOV Protection à maximum de tension homopolaire ou de tension résiduelle 59N/59G PTOV

Protection à maximum de composante inverse ou contre les déséquilibres de tension 47 PTOV

Les exigences générales relatives aux relais de mesure et aux dispositifs de protection sont spécifiées par la CEI 60255-1

Les documents référencés suivants sont indispensables pour l’application de ce document

Pour des références datées, seule l'édition citée est applicable Pour les références non datées, la dernière édition du document de référence (y compris les éventuels amendements) s'applique

CEI 60044 (toutes les parties), Transformateurs de mesure

CEI 60255-1, Relais de mesure et dispositifs de protection – Partie 1: Exigences communes

Au sens de ce document, les termes et définitions suivants s'appliquent:

3.1 courbe théorique du temps et de la grandeur caractéristique courbe qui représente la relation entre le temps de fonctionnement théorique spécifié et la grandeur caractéristique

Tiêu đề	Measuring relays and protection equipment – Part 127: Functional requirements for over/under voltage protection
Thể loại	Standard
Năm xuất bản	2010
Thành phố	Geneva

Định dạng
Số trang	54
Dung lượng	1,21 MB