GB/T 18216.3-2021Electrical safety in low voltage distribution systems up to 1 000 V a. c. and 1 500 V d. c. - Equipment for testing, measuring or monitoring of protective measures - Part 3: Loop impedance (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 of Standardization Documents"

Drafting.

This document is GB/T 18216 "AC 1000V and DC 1500V and below low-voltage power distribution system electrical safety protection measures

Part 3 of "Testing, Measuring or Monitoring Equipment". GB/T 18216 has released the following parts.

---Part 1.General requirements;

---Part 2.Insulation resistance;

---Part 3.Loop impedance;

---Part 4.Grounding resistance and equipotential grounding resistance;

---Part 5.Resistance to ground;

---Part 8.Insulation monitoring device in IT system;

---Part 9.Insulation fault location equipment in IT systems;

---Part 12.Performance Measurement and Monitoring Device (PMD).

This document replaces GB/T 18216.3-2012 "Electrical safety protection for low-voltage power distribution systems below 1000V AC and 1500V DC

Test, measurement or monitoring equipment for protective measures Part 3.Loop impedance", compared with GB/T 18216.3-2012, except for structural adjustments and

In addition to editorial changes, the main technical changes are as follows.

---Added requirements for measurement categories (see 4.1);

---Added new requirements for the instruction manual (see 5.2).

The translation method used in this document is equivalent to IEC 61557-3.2019 ``AC 1000V and DC 1500V and below low-voltage power distribution system

Testing, measuring or monitoring equipment for integrated electrical safety protection measures. Part 3.Loop impedance.

Introduction

IEC 60364-6 specifies the first test, continuous monitoring and adjustment of these equipment in TN, TT or IT systems.

Standardized conditions for the post-adjustment test. In addition to the general standards that specify the implementation of these tests, IEC 60364-6 also includes

To verify the requirements. Only in a few cases, such as when measuring insulation resistance, does IEC 60364-6 include the measuring device used.

Details of the characteristics of the settings. Circuit diagrams given as examples in IEC 60364-6 and cited in the main text of the document are generally not applicable

actual use.

When dangerous voltages appear in the electrical installation and the equipment is improperly used or defective, the implementation of the test in the electrical installation can easily cause concern.

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

The application of the general safety rules for electrical and electronic measuring devices (IEC 61010-1) for protective measures is in itself insufficient. in

Measurements in power installations are not only harmful to technicians, but also to third parties due to different measurement methods.

Similarly, in order to obtain an objective judgment about the equipment, such as periodic tests, continuous insulation monitoring, or

In the case of performance assurance, an important prerequisite is to use measurement devices from different manufacturers to obtain reliable and comparable measurement results.

The purpose of GB/T 18216 is to specify uniform principles that are consistent with the above characteristics. These principles are applicable to nominal voltage AC

Measuring and monitoring equipment for electrical safety test and performance test in 1000V and DC 1500V and below systems. GB/T 18216

It is proposed to consist of ten parts.

---Part 1.General requirements. The purpose is to establish a low-voltage power distribution system with nominal voltages of AC 1000V and DC 1500V and below

General requirements for test equipment used for electrical safety measurement and monitoring in the system.

---Part 2.Insulation resistance. The purpose is to establish that the measurement is suitable for the insulation of equipment and electrical installation equipment in a non-excited state

Relevant requirements for resistance equipment.

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

The relevant requirements of the loop impedance device between the line conductors.

---Part 4.Grounding resistance and equipotential grounding resistance. The purpose is to establish the grounding conductor, protective grounding conductor and

And the relevant technical requirements for the resistance of the equipotential bonding conductor.

---Part 5.Resistance to ground. The purpose is to establish requirements for measuring equipment that uses AC voltage to measure resistance to earth.

---Part 6.Effectiveness of Residual Current Device (RCD) in TT, TN and IT systems. The purpose is to establish that the measurement is suitable for

Relevant requirements for test equipment for the effectiveness of protective measures for residual current devices in TT, TN and IT systems.

---Part 8.Insulation monitoring device in IT system. The purpose is to establish relevant requirements for insulation monitoring devices in IT systems.

---Part 9.Insulation fault location equipment in IT systems. The purpose is to establish the phase of insulation fault location equipment in the IT system.

Close requirements.

--- Part 10.Combination measuring equipment for testing, measuring or monitoring protective measures. The purpose is to establish test, measurement or monitoring

The related requirements of the equipment in which a variety of measurement functions or measurement methods are combined together.

---Part 12.Performance Measurement and Monitoring Device (PMD). The purpose is to establish a comprehensive measurement and monitoring of electrical parameters in the distribution system.

Meet the relevant requirements of performance measurement and monitoring devices.

AC 1000V and DC 1500V and below

Testing of electrical safety protection measures for low-voltage power distribution systems,

Measuring or monitoring equipment Part 3.Loop impedance

1 Scope

This document specifies the loop impedance setting between the measuring line conductor and the protective conductor, between the line conductor and the neutral conductor, or between the two conductors.

According to the requirements of equipment, the measurement of loop impedance is carried out by the method of loading the test line to measure the voltage drop.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations

Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to

This document.

GB/T 18216.1-2021 AC 1000V and DC 1500V and below low-voltage power distribution system electrical safety protection measures

Testing, measuring or monitoring equipment Part 1.General requirements (IEC 61557-1.2019, IDT)

IEC 61010-1.2010 AMD1.2016 Safety requirements for electrical equipment for measurement, control and laboratory use Part 1.General

Requirements (Safetyrequirementsforelectricalequipmentformeasurement, controlandlaboratoryuse-Part

1 Generalrequirements)

IEC 61010-2-030.2017 Safety requirements for electrical equipment for measurement, control and laboratory use Part 2-030.with test and

Special requirements for equipment measuring circuits (Safety requirements for electrical equipment for measurement, control,

andlaboratoryuse-Part 2-030.Particularrequirementsforequipmenthavingtestingormeasuring

circuits)

3 Terms and definitions

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

ISO and IEC maintain a terminology database for standardization. The website is as follows.

3.1

Loading

A method of applying a load to a circuit in a power distribution system to cause a voltage drop.

3.2

Loadingequipment

A part of a measuring device that is used to load the circuit under test.

3.3

Test current

The current controlled by the measuring device that causes a voltage drop in the circuit under test.