GB/T 18216.7-2024Electrical safety in low voltage distribution systems up to 1000V a. c. and 1500V d. c. - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequence (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 is required.

This document is a test document of GB/T 18216 "Test Methods for Electrical Safety Protection Measures for Low Voltage Distribution Systems with AC 1 000 V and DC 1 500 V and Below" Part 7 of GB/T 18216.GB/T 18216 has published the following parts.

Part 1: General requirements;-Part 2: Insulation resistance;

Part 3: Loop impedance;-Part 4: Earth resistance and equipotential earth resistance;

Part 5: Resistance to Earth;

Part 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems; -Part 7: Phase sequence;

Part 8: Insulation monitoring devices in IT systems;

Part 9: Insulation fault location equipment in IT systems;

Part 10: Combined measuring equipment for testing, measuring or monitoring protective measures; -Part 12: Performance measuring and monitoring devices (PMD). -this document is equivalent to IEC 61557-7:2019 "Electrical safety of low voltage power distribution systems up to 1 000 V AC and 1 500 V DC" Testing, measuring or monitoring equipment for protective measures - Part 7: Phase sequence.

The following minimal editorial changes were made to this document.

Incorporates the amendments to IEC 61557-7:2019/AMD1.2023, the clauses involved in these amendments have been updated through their external the margins are indicated by double vertical lines (||).

Introduction

Low voltage power distribution grounding systems are divided into three types. IT system, TT system and TN system. IEC 60364-6 specifies the grounding system of the above systems.

Standardized conditions for initial testing of power installation equipment, for continuous monitoring, and for testing of these equipment after adjustment.

In addition to the applicable standards, IEC 60364-6 also includes requirements that need to be verified by measurement. Only in a few cases, such as when measuring absolute when measuring insulation resistance, IEC 60364-6 includes details of the characteristics of the measuring device used.

Circuit diagrams cited in the text are generally not suitable for actual use.

When dangerous voltages are present in electrical installations or equipment is used improperly or is damaged, testing in electrical installations can easily cause accidents.

Therefore, technicians need to rely on measuring devices that ensure the safety of the measuring method in addition to simplifying the measurement.

Applying the general rules for safety of electrical and electronic measuring devices (IEC 61010-1) to perform protective measures testing is not sufficient in itself.

Measurements in power installations can pose a hazard not only to the technicians but also to third parties due to different measurement methods.

Likewise, in order to obtain an objective assessment of the equipment, for example, periodic testing, continuous insulation monitoring or in the case of performance assurance, an important prerequisite is to obtain reliable and comparable measurement results with measuring devices from different manufacturers.

GB/T 18216 "Test,

The purpose of the "Measuring or Monitoring Equipment" is to provide uniform principles for compliance with the above characteristics, which apply to nominal voltage AC Measuring and monitoring equipment for electrical safety tests and performance tests in systems with a voltage of 1 000 V and DC 1 500 V and below. GB/T 18216 it consists of seventeen parts.

Part 1: General requirements. The purpose is to establish the low voltage distribution system with a nominal voltage of 1 000 V AC and 1 500 V DC and below.

General requirements for test equipment for measuring and monitoring electrical safety.

Part 2: Insulation resistance. The purpose is to establish the insulation resistance of equipment and electrical installations in the non-energized state.

Requirements for resistance equipment.

Part 3: Loop impedance. The purpose is to establish the impedance between the line conductor and the protective conductor, between the line conductor and the neutral conductor, or between the two.

Requirements for loop impedance equipment between line conductors.

Part 4: Earth resistance and equipotential earth resistance. The purpose is to establish the earth conductor of the measuring equipment, the protective earth conductor and and related requirements for equipotential bonding conductor resistance.

Part 5: Resistance to Earth. The purpose is to establish requirements for measuring equipment that uses an alternating voltage to measure resistance to earth.

Part 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems. The purpose is to establish the effectiveness of residual current devices (RCD) in TT, TN and IT systems.

Requirements for measuring equipment for the effectiveness of protective measures taken by residual current devices in TT, TN and IT systems.

Part 7: Phase sequence. The purpose is to establish the requirements for measuring equipment used to measure the phase sequence of three-phase power distribution systems.

Part 8: Insulation monitoring devices in IT systems. The purpose is to establish the requirements for insulation monitoring devices in IT systems.

Part 9: Insulation fault location equipment in IT systems. The purpose is to establish the relevant Require.

Part 10: Combined measuring equipment for testing, measuring or monitoring protective measures. The purpose is to establish the Combined measuring equipment that combines several measuring functions or test methods for testing, measuring or monitoring in accordance with the respective parts of this series of standards requirements.

Part 11: Effectiveness of residual current monitors (RCM) in TT, TN and IT systems. The purpose is to establish Requirements for equipment for testing the effectiveness of residual current monitors installed in power distribution systems.

Part 12: Quantity Measuring and Monitoring Devices (PMD). The purpose is to establish a comprehensive system for measuring and monitoring electrical parameters in power distribution systems.

Relevant requirements for combined electrical quantity measuring and monitoring devices.

Part 13: Hand-held and hand-operated current clamps and sensors for measuring leakage current in distribution systems.

Requirements for hand-held and hand-operated current clamps and sensors for measuring leakage current in systems.

Part 14: Equipment for testing the safety of electrical equipment of machinery. The purpose is to specify the equipment used to test the safety of electrical equipment of machinery.

Special requirements for equipment.

Part 15: Functional safety requirements for insulation monitoring devices and insulation fault location equipment in IT systems. The purpose is to specify the functional safety requirements for insulation monitoring devices and insulation fault location equipment in IT systems.

Functional safety requirements for insulation monitoring devices and insulation fault location equipment.

Part 16: Equipment for testing the effectiveness of protective measures for electrical equipment and/or medical electrical equipment.

Particular requirements for equipment to assess the effectiveness of protective measures for medical electrical equipment and/or medical electrical equipment.

Part 17: Non-contact voltage indicators. The purpose is to specify the minimum performance requirements for non-contact voltage indicators. -AC 1 000 V and DC 1 500 V and below Electrical safety of low voltage power distribution system Equipment for testing, measuring or monitoring protective measures Part 7: Phase Sequence

1 Scope

This document specifies the requirements for measuring equipment used to test the phase sequence of three-phase power distribution systems. The indication of phase sequence may be mechanical, visual or and/or auditory.

This document does not apply to additional measurements of other quantities nor to monitoring relays.

Note. Appendix I of IEC 61010-1:2016 describes common three-phase power distribution systems.

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.

in this document.

GB/T 18216.1-2021 Test Method for Electrical Safety Protection Measures for Low Voltage Distribution Systems with AC 1 000 V and DC 1 500 V and Below Testing, measuring or monitoring equipment Part 1: General requirements (IEC 61557-1:2019, IDT) IEC 61010-1:2016 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements for electrical equipment for measurement, control, and laboratory use-Part 1: General requirements Note. GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1: General requirements (IEC 61010-1.:2001, IDT IEC 61010-2-030 Safety requirements for electrical equipment for measurement, control and laboratory use Part 2-030.Test or measuring circuits Safety requirements for electrical equipment for measurement, control, and laborat ory use-Part 2-030:Particular requirements for equipment having testing or measuring circuits) IEC 61010-031 Safety requirements for electrical equipment for measurement, control and laboratory use Part 031: Handheld instruments for electrical measurement and testing Safety requirements for electrical equipment for measurement, control and laboratory use-Part 031: Safety requirements for hand-held and hand-manipulated probe assem-blies for electrical test and measurement) Note. GB 4793.5-2008 Safety requirements for electrical equipment for measurement, control and laboratory use Part 5: Hand-held probe assemblies for electrical measurement and test Safety requirements (IEC 61010-031:2002, IDT)

3 Terms and definitions

The terms and definitions defined in GB/T 18216.1-2021 and the following apply to this document.

The URLs for terminology databases used for standardization maintained by ISO and IEC are as follows.