GB/T 14598.27-2025Measuring relays and protection equipment - Part 27: Product safety requirements (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document is part 27 of GB/T 14598.GB/T 14598 has been published in the following parts.

---GB/T 14598.2 Measuring relays and protection devices Part 1: General requirements;

---GB/T 14598.3 Electrical relays Part 5: Insulation coordination requirements and tests for measuring relays and protection devices;

---GB/T 14598.8 Electrical relays Part 20: Protection systems;

---GB/T 14598.23 Electrical relays Part 21: Vibration, shock, impact and earthquake of measuring relays and protective devices Test Part 3: Earthquake Test;

---GB/T 14598.24 Measuring relays and protection devices Part 24: Transient data exchange in power systems (COMTRADE) Common Format;

---GB/T 14598.26 Measuring relays and protection devices Part 26: Electromagnetic compatibility requirements;

---GB/T 14598.27 Measuring relays and protection devices Part 27: Product safety requirements;

---GB/T 14598.118 Measuring relays and protection devices Part 118: Synchronous phasor measurement in power systems;

---GB/T 14598.121 Measuring relays and protection devices Part 121: Requirements for distance protection functions;

---GB/T 14598.127 Measuring relays and protection devices Part 127: Over/undervoltage protection function requirements;

---GB/T 14598.149 Measuring relays and protection devices Part 149: Functional requirements of electric heating relays;

---GB/T 14598.151 Measuring relays and protection devices Part 151: Over/under current protection function requirements;

---GB/T 14598.181 Measuring relays and protection devices Part 181: Requirements for frequency protection functions;

---GB/T 14598.300 General technical requirements for transformer protection devices;

---GB/T 14598.301 Technical requirements for continuous recording devices in power systems;

---GB/T 14598.302 Technical requirements for arc protection devices;

---GB/T 14598.303 General technical requirements for digital integrated motor protection devices;

---GB/T 14598.1871 Measuring relays and protection devices Part 187-1.Functional requirements for differential protection of motors, Generator and transformer ratio restrained differential protection and differential quick-break protection.

This document replaces GB/T 14598.27-2017 "Measuring relays and protection devices Part 27: Product safety requirements" and Compared with GB/T 14598.27-2017, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) The following terms and definitions have been changed. "accessible conductive parts" (see 3.1, 3.18 of the 2017 edition), "accessible parts" (see 3.2, 3.1 of the 2017 edition), "adjacent circuits" (see 3.3, 3.2 of the 2017 edition), "fences" (see 3.5, 3.4), "Extra-low voltage" (see 3.16, 3.16 of the 2017 edition), "Functional grounding circuit" (see 3.18, 3.20 of the 2017 edition), "Hazardous live parts" (see 3.21, 3.23 of the 2017 edition), "Hazardous live voltage" (see 3.22, 3.24 of the 2017 edition), "High "Integrity components" (see 3.23, 3.27 of the 2017 edition), "Class I equipment" (see 3.33, 3.7 of the 2017 edition), "Class II equipment" (see 3.34, 3.8 of the 2017 edition), "pollution degree" (see 3.37, 3.39 of the 2017 edition), "primary circuit" (see 3.38,

2017 Edition), "Protective bonding resistor" (see 3.40, 3.46 of the 2017 Edition), "Protective conductor" (see 3.41, 3.47), "Protective earthing" (see 3.42, 3.48 of the 2017 edition), "Protective equipotential bonding circuit" (see 3.43, 3.36), "Protective extra-low voltage circuits" (see 3.44, 3.37 of the 2017 edition), "Protective shielding" (see 3.46, 2017 edition 3.50), "Protective isolation" (see 3.47, 3.51 of the 2017 edition), "Rated voltage" (see 3.50, 3.54 of the 2017 edition), "Reinforced "Insulation" (see 3.51, 3.55 of the 2017 edition), "Restricted access area" (see 3.52, 3.56 of the 2017 edition), "Key safety devices "Parts" (see 3.54, 3.58 of the 2017 edition), "Safety Extra Low Voltage Circuits" (see 3.55, 3.60 of the 2017 edition), "Single Fault Status" (see 3.57, 3.61 of the 2017 edition);

b) Added the following terms and definitions. "basic protection" (see 3.7), "cabinet" (see 3.9), "low power transformer" (see 3.25), "low "Power current transformer" (see 3.26), "Low power voltage transformer" (see 3.27), "Maintenance use" (see 3.28), "Normal use" (see 3.30), "solid insulation" (see 3.58) and "wired network port" (see 3.63);

c) The following terms and definitions have been deleted. "communication circuits/networks" (see 3.12 of the 2017 edition), "HB40 grade materials" (see 3.25 of the 2017 edition), "HB75 grade materials" (see 3.26 of the 2017 edition), "maintenance operators" (see 3.30 of the 2017 edition), "micro "Observational Environment" (see 3.31 of the 2017 edition), "Normal Conditions" (see 3.33 of the 2017 edition), "Pollution Level 1" (see 3.40 of the 2017 edition), "Pollution Level 2" (see 3.41 of the 2017 edition), "Pollution Level 3" (see 3.42 of the 2017 edition), "Pollution Level 4" (see 3.43 of the 2017 edition);

d) Added "Equipment enclosure requirements for electric shock protection" (see 4.1.3);

e) Changed the documentation requirements (see 8.2.1, 9.2.1 of the 2017 edition);

f) Changed the scope of the safety assessment basis clause (see 9.1, 10.1 of the 2017 edition);

g) Added environmental tests (see 9.6.1.1) and dielectric voltage tests and insulation resistance tests for mechanical requirements (see 9.6.2.1);

h) Added short-time limit dynamic stability overload (see 9.6.5.3.2);

i) increased resistance to mechanical stress (see 9.6.7);

j) Added low-power voltage and current transformer ports (see Appendix A.2);

k) The guidance for determining electrical clearance, creepage distance and withstand voltage has been changed (see Appendix C, Appendix C of the 2017 edition);

l) Added varistors and intentional radio transmitters (see Appendix D.9 and Appendix D.10);

m) Added risk assessment (see Appendix G);

n) Sampling test has been deleted (see 10.3 of the 2017 edition).

This document is modified to adopt IEC 60255-27:2023 "Measuring relays and protection devices Part 27: Product safety requirements".

The technical differences between this document and IEC 60255-27:2023 and their reasons are as follows.

--- Replaced IEC 60529:1989, IEC 60529:1989/AMD1.1999 and GB/T 4208-2017 with the normative reference IEC 60529:1989/AMD2.2013, the consistency between the several documents is equivalent, so as to unify the reference document version.

Standard application.

--- The insulation resistance of 9.6.4.5.1 "when DC 500V is applied shall not be less than 1Mohm. After the wet heat type test and recovery for 1h~ After 2h, the insulation resistance when DC 500V is applied under reference environmental conditions shall not be less than 1Mohm.

The insulation resistance at 500V should not be less than 100Mohm. After the damp heat type test and recovery for 1h~2h, in the reference environment the insulation resistance should not be less than 10Mohm when DC 500V is applied under the condition.

The insulation resistance is increased from 1Mohm to 100Mohm, which significantly improves the insulation performance index of the product and reduces the risk of leakage or breakdown.

The insulation resistance requirement after the damp heat test is increased from 1Mohm to 10Mohm to ensure that the equipment can still maintain a relatively high insulation resistance in a humid environment.

High insulation performance improves the reliability of equipment under harsh conditions.

The following editorial changes were made to this document.

--- In order to correct the typo in the original IEC text, the relevant content of 3.15 was changed, and the "(see Chapter 7)" in the note was changed to "(see Chapter 6)";

--- In order to correct the typos in the original IEC text, the relevant contents of 9.6.1.1, 9.6.2.1, 9.6.2.2, 9.6.2.3, and 9.6.2.4 were changed to "Pressure" is changed to "Insulation resistance";

--- In order to correct the typo in the original IEC text, the relevant content of A.3 was changed, and "applicable to Table A.1" was changed to "applicable to Table A.2";

--- In order to correct the typo in the original IEC text, the relevant content of D.9b) was changed, and "Table 1 Group 1" was changed to "Table 4 Group 1", "2.3.6" Change to "5.3.6" and "Appendix A" to "Appendix X".

Introduction

The IEC 60255 series of standards specifies the technical requirements and power system solutions for measuring relays and protection devices, as well as related IEC 60255-1~IEC 60255-99 specifies the basic general requirements for relays and protection devices.

Requirements mainly include basic functions, mechanical properties, electromagnetic compatibility performance, product safety requirements, and general format for transient data exchange.

IEC 60255-100~IEC 60255-199 specifies frequency protection, overcurrent/undercurrent protection, overvoltage/undervoltage protection, and distance protection.

Functional performance requirements and test methods of major protection modules such as IEC 60255-200~IEC 60255-299 are presented in the form of technical reports.

Special research is conducted to define the technical requirements for other protection equipment and related control, monitoring and process interface equipment.

The purpose of formulating GB/T 14598 is to stipulate unified principles that are consistent with the above characteristics. These principles are applicable to power generation, transmission and distribution systems.

Measuring relays and protection devices used in systems. GB/T 14598 is intended to consist of 18 parts.

--- Part 2: General requirements for measuring relays and protection devices. The purpose is to specify measuring relays and protection devices and the General rules and requirements for power system protection schemes consisting of these devices such as control, monitoring and process interface equipment.

--- Part 3: Insulation coordination requirements and tests for measuring relays and protection devices. The purpose is to specify the insulation coordination requirements for measuring relays and protection devices.

General requirements for insulation coordination of devices, including how to select electrical clearances and creepage distances, voltage tests, insulation resistance measurements, etc.

--- Part 8: Protection system. The purpose is to specify the performance requirements of the entire protection system and its components, applicable to all types of protection Protective devices and devices connected to the protective devices that have an impact on them.

--- Part 23: Earthquake test. The purpose is to specify the test methods and test conditions for earthquake tests on measuring relays and protection devices Test severity levels, test procedures and acceptance criteria.

--- Part 24: Common format for power system transient data exchange (COMTRADE). The purpose is to define a common data Interchange format, used to store various types of fault, test and simulation data files and exchange media. Define data exchange general format, which is conducive to improving the analysis, testing, evaluation and simulation of power systems and their protection and control measures under fault disturbance conditions.

Automated level.

--- Part 26: Electromagnetic compatibility requirements. The purpose is to specify the electromagnetic compatibility requirements for measuring relays and protection devices, including electromagnetic Emissions and Immunity.

--- Part 27: Product safety requirements. The purpose is to specify the basic safety requirements for measuring relays and protection devices so that the risk of fire, electric shock or injury to the user is minimized. This standard also applies to devices used with measuring relays and protective devices Test and auxiliary devices used.

--- Part 118: Power system synchronized phasor measurement. The purpose is to specify the performance classification of synchronized phasor measurement and the performance of each performance Evaluation methods and performance indicators for steady-state performance and dynamic performance of categories.

--- Part 121: Distance protection functional requirements. The purpose is to specify the functions and performance evaluation of distance protection on power system lines.

minimum requirements for pricing, and how performance test results should be recorded and published.

--- Part 127: Over/undervoltage protection function requirements. The purpose is to specify the minimum requirements for over/undervoltage relays, including protection Specifications of functions, measurement characteristics and delay characteristics.

--- Part 149: Functional requirements for electric thermal relays. The purpose is to specify the minimum requirements for electric thermal relays, including protection functions, test Specifications for quantitative characteristics and test methods.

--- Part 151: Over/under current protection function requirements. The purpose is to specify the minimum requirements for over/under current relays, including protection Specifications of functions, measurement characteristics and delay characteristics.

--- Part 181: Frequency protection function requirements. The purpose is to specify the minimum requirements for frequency protection functions and performance evaluation, and to record Methods for recording and publishing performance test results.

--- Part 300: General technical requirements for transformer protection devices. The purpose is to specify the technical requirements, test Methods, inspection rules, marking and labeling, packaging, transportation and storage requirements, etc.

--- Part 301: Technical requirements for continuous recording devices in power systems. The purpose is to specify the technical requirements for continuous recording devices in power systems.

Requirements, test methods, inspection rules, marking labels, packaging, transportation and storage requirements, etc.

--- Part 302: Technical requirements for arc protection devices. The purpose is to specify the technical requirements, test methods, inspection and Inspection rules, marking and labeling, packaging, transportation and storage requirements.

--- Part 303: General technical requirements for digital motor integrated protection devices. The purpose is to specify the general technical requirements for digital motor integrated protection devices.

General technical requirements, test methods, inspection rules, marking labels, packaging, transportation and storage requirements for protective devices.

--- Part 1871: Functional requirements for differential protection of motors, generators and transformers Ratio brake differential protection and differential quick trip protection the purpose is to define the functions and performance evaluation of (longitudinal) differential protection for AC motors, generators and transformers.

Minimum price requirement.

This document amends IEC 60255-27:2023, which specifies the requirements for measuring relays and protective devices against hazards caused by fire and electric shock.

Provides effective protection against electrical, mechanical, thermal, fire and other risks, and also covers equipment the abnormal situations that may occur during the use of the equipment are fully considered, and the impact of electromagnetic interference on the safe operation of the equipment is fully considered to ensure that the equipment can operate in a complex environment.

Safe and reliable operation in the environment.

Measuring relays and protective devices Part 27.

Product safety requirements

1 Scope

This document specifies measuring relays and protection devices with rated voltages up to 1000 V AC or 1500 V DC.

Product safety requirements for devices. Equipment above this limit shall be determined by GB/T 16935.1 for its electrical clearance, creepage distance and withstand test Voltage.

This document specifies basic safety requirements to minimize the risk of fire, electric shock, or damage to users and property.

The document only specifies the safety requirements of the product and does not involve the functional characteristics of the equipment.

This document covers all ways of installing and using the equipment in cabinets, racks and panels.

Auxiliary devices used and tested together with protection devices, such as shunts, series resistors, mutual inductors, auxiliary control panels, displays, etc.

Auxiliary equipment used in conjunction with measuring relays and protection devices, such as network switches, may be subject to additional safety requirements.

This document does not specify the implementation of a single device, circuit or component.

This document applies to the safe design of equipment under at least the following environmental conditions.

---For indoor use;

---Altitude not exceeding.2000m (consistent with GB/T 14598.2);

--- Rated operating ambient temperature range (consistent with GB/T 14598.2);

--- Maximum external relative humidity (consistent with GB/T 14598.2);

--- Auxiliary excitation voltage operating range (consistent with GB/T 14598.2);

--- Applicable power supply overvoltage category;

--- Applicable expected environmental pollution level (level 2 pollution in most cases).

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 4208-2017 Degrees of protection provided by enclosures (IP code) (IEC 60529:2013, IDT) GB/T 12113-2023 Measurement methods of touch current and protective conductor current (IEC 60990:2016, IDT) GB/T 16935.1-2023 Insulation coordination for equipment in low voltage systems Part 1: Principles, requirements and tests (IEC 60664-1.

2020, IDT)

nation)

Note. GB/T 11021-2014 Electrical insulation heat resistance and representation methods (IEC 60085:2007, IDT) IEC 60127-1 Miniature fuses Part 1: Miniature fuses definition and general requirements for miniature fuses Note. GB 9364.1-2015 Miniature fuses Part 1: Definition of miniature fuses and general requirements for miniature fuse-links (IEC 60127-1:2006, MOD) equipment-Part 1: Commonrequirements)