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GB/T 18216.8-2015 English PDF (GBT18216.8-2015)

GB/T 18216.8-2015 English PDF (GBT18216.8-2015)

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GB/T 18216.8-2015: Electrical 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 8: Insulation monitoring devices for IT systems

GB/T 18216.8-2015
Electrical safty in low voltage distribution systems up to 1 000 V ac and 1 500 V dc-Equipment for testing, measuring or monitoring of protective measures-Part 8. Insulation monitoring devices for IT systems ICS 17.220.20
N20
National Standards of People's Republic of China
1000V AC and 1500V DC
Electrical safety protection measures for low-voltage power distribution systems Test, measurement or monitoring equipment
Part 8. Insulation monitoring devices in IT systems
1500Vd.c-Equipmentfortesting, measuringormonitoringofprotective
measures-Part 8. InsulationmonitoringdevicesforITsystems
(IEC 61557-8..2007, IDT)
2015-12-10 Release.2016-07-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Published by China National Standardization Administration
Contents
Foreword III
1 range 1
2 Normative references 1
3 Terms and definitions 2
4 Requirement 3
5 Signs and instructions for use 5
6 Test 6
Appendix A (Normative) Medical Insulation Monitoring Devices (IMDs) 9
Appendix B (informative) Monitoring of overload and high temperature 12 References 13
Foreword
GB/T 18216 《Test, measurement or test of electrical safety protection measures for low-voltage distribution systems with AC 1000V and DC 1500V below Monitoring Equipment is divided into 13 parts.
--- Part 1. General requirements;
--- Part 2. Insulation resistance;
--- Part 3. Loop impedance;
--- Part 4. Ground resistance and equipotential ground resistance;
--- Part 5. Resistance to ground;
--- Part 6. Residual current protection devices (RCD) in TT and TN systems; --- Part 7. Phase sequence;
--- Part 8. Insulation monitoring devices in IT systems;
--- Part 9. Insulation fault location equipment in IT systems;
--- Part 10. Comprehensive detection or monitoring device for protective measures; --- Part 11. Effectiveness of Class A and B residual current monitoring in TT, TN, IT systems; --- Part 12. Performance Measurement and Monitoring Device (PMD);
--- Part 13. Hand-held current clamps and sensors for leakage current measurement in power distribution systems. This part is Part 8 of GB/T 18216.
This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section uses the translation method equivalent to the IEC 61557-8..2007 "AC 1000V and DC 1500V low voltage power distribution system Testing, measuring or monitoring equipment for electrical safety protection measures-Part 8. Insulation monitoring devices in IT systems "(English version). This section incorporates the contents of the technical corrigendum to IEC 61557-8..2007.The clauses related to these amendments have been passed on its outer margin. The vertical double line (|) in the white position is marked.
The Chinese documents that have a consistent correspondence with the international documents referenced normatively in this section are as follows. --- GB 4793.1-2007 Safety requirements for electrical equipment for measurement, control and laboratory use-Part 1. General requirements (IEC 61010-1..2001, IDT)
--- GB/T 4798.1-2005 Environmental conditions for the application of electric and electronic products Part 1. Storage (IEC 60721-3-1..1997, MOD)
--- GB/T 4798.2-2008 Environmental conditions for the application of electric and electronic products Part 2. Transportation (IEC 60721-3-2..1997, MOD)
--- GB/T 4798.3-2007 Environmental conditions for the application of electric and electronic products Part 3. Fixed use in weather-protected places (IEC 60721-3-3..2002, MOD)
--- GB 9816-2008 Requirements and Application Guidelines for Thermal Links (IEC 60691..2002, IDT) --- GB 14048.5-2008 Low-voltage switchgear and control equipment Part 5-1. Control circuit appliances and switching element machines Electrical control circuit appliances (IEC 60947-5-1..2003, MOD)
--- GB/T 14048.17-2008 Low-voltage switchgear and control equipment Part 5-4. Control circuit appliances and switchgear Special test for performance evaluation method of a small-capacity contact (IEC 60947-5-4..2002, IDT) --- GB 16895.24-2005 Building electrical installations Part 7-710. Requirements for special installations or locations-Medical facilities (IEC 60364-7-710..2002, IDT)
--- GB/T 16935.1-2008 Insulation coordination for equipment in low-voltage systems Part 1. Principles, requirements and tests (IEC 60664- 1..2007, IDT)
--- GB/T 16935.3-2005 Insulation coordination for equipment in low-voltage systems Part 3. Use coating, canning and molding Antifouling protection (IEC 60664-3..2003, IDT)
--- GB/T 18216.1-2012 Electrical safety protection measures for low-voltage distribution systems with AC 1000V and DC 1500V below Testing, measuring or monitoring equipment-Part 1. General requirements (IEC 61557-1..2007, IDT) --- GB/T 18268.24-2010 Requirements for electromagnetic compatibility of electrical equipment for measurement, control and laboratory use. Part 24. Special Special requirements for testing of insulation monitoring devices conforming to IEC 61557-8 and insulation fault locating equipment conforming to IEC 61557-9 Configuration, operating conditions and performance criteria (IEC 61326-2-4..2006, IDT) The following editorial changes have been made in this section.
--- Replace IEC 61557-8..2007 with this part of GB/T 18216;
--- In the Note 1 of Chapter 1 and references, GB 16895.21 is used instead of IEC 60364-4-41; --- Decimal point symbol with "." Instead of ",".
Please note that some elements of this document may involve patents. The issuer of this document is not responsible for identifying these patents. This section is proposed by China Machinery Industry Federation.
tions)
IEC 60947-5-1 Low-voltage switchgear and controlgear. Part 5-1. Control circuit devices and switching elements. Electromechanical control circuits (Low-voltageswitchgearandcontrolgear-Part 5-1. Controlcircuitdevicesandswitchingele- ments-Electromechanicalcontrolcircuitdevices)
IEC 60947-5-4 Low-voltage switchgear and controlgear. Part 5-4. Low-energy contacts for control circuit devices and switching elements Performance evaluation method special test (Low-voltageswitchgearandcontrolgear-Part 5-4. Controlcircuitdevices andswitchingelements-Methodofassessingtheperformanceoflow-energycontacts-Specialtests) IEC 61010-1..2001 Safety requirements for electrical equipment for measurement, control and laboratory use-Part 1. General requirements (Safety requirementsforelectricalequipmentformeasurement, control, andlaboratoryuse-Part 1. General requirements)
IEC 61326-2-4 EMC requirements for electrical equipment for measurement, control, and laboratory use-Part 2-4. Special requirements apply Test configuration, operating conditions and performance of insulation monitoring devices according to IEC 61557-8 and insulation fault location equipment according to IEC 61557-9 Performance criteria (Electricalequipmentformeasurement, controlandlaboratoryuse-EMCrequirements-Part 2-4. Particularrequirements-Testconfigurations, operationalconditionsand performancecriteriaforinsu- lationmonitoringdevicesaccordingtoIEC 61557-8andforequipmentforinsulationfaultlocationac- cordingtoIEC 61557-9)
IEC 61557-1 Test and measurement of electrical safety protection measures for low-voltage distribution systems with AC 1000V and DC 1500V below Or monitoring equipment Part 1. General requirements (Electricalsafetyinlowvoltagedistributionsystemsupto1000V acand1500Vd.c.-Equipmentfortesting, measuringormonitoringofprotectivemeasures-Part 1. Generalrequirements)
IEC 61810-2 Basic Electromechanical Relays Part 2. Reliability (Electromechanical elementary relays-Part 2. Reliability)
CISPR11 Measurement methods and limits for electromagnetic disturbance characteristics of industrial, scientific and medical (ISM) RF equipment (Industrial, scientificandmedical (ISM) radio-frequencyequipment-Electromagneticdisturbancecharacteristics- Limitsandmethodsofmeasurement)
3 terms and definitions
The terms and definitions defined in IEC 61557-1 and the following apply to this document. 3.1
External DC voltage extraneousd.c.volatage
Ufg
A DC voltage (generated by a DC component) between an AC conductor and ground in an AC system. 3.2
Insulation resistance
RF
The ground resistance of the monitored system, including the ground resistance of all connected equipment. 3.3
Specified response value
Ran
The insulation resistance value is fixed or adjustable on the insulation monitoring device, and it is monitored whether the insulation resistance drops below this limit. 3.4
Response value
Ra
Under specified conditions, the insulation resistance value of the insulation monitoring device responds. 3.5
Relative uncertainty
The response value is subtracted from the specified response value and then divided by the specified response value and multiplied by 100%, which is expressed as a percentage. A =
Ra-Ran
Ran ×
100%
3.6
Systemleakagecapacitance
Ce
The maximum allowable value of the total capacity of the monitored system to ground (including all electrical equipment connected to the system), below this value The device can work as specified.
3.7
Rated contact voltage
Rated voltage at which the relay contacts open and close under specified conditions. 3.8
Response time
tan
The time required for the insulation monitoring device to respond under the conditions specified in 6.1.2. 3.9
Measuring voltage
Um
The voltage appearing on the measurement terminal during measurement.
Note. Supplementary explanation to the definition given in IEC 61557-1, the measured voltage (Um) is the terminal of the monitored system and the protective conductor terminal without fault and no current The voltage that appears between.
3.10
Measuring current
Im
The maximum current that can flow between the system and ground is limited by the internal resistance Ri of the measuring voltage source of the insulation monitoring device. Note. The measured current is called injection current in IEC 60364-7-710. 3.11
Internal impedance
Zi
The total impedance of the insulation monitoring device measured at the nominal frequency (connected) between the terminal of the monitored system and the ground terminal. 3.12
DC internal resistance internald.c.resistance
Ri
Resistance (connection) between the terminal of the monitored system and the ground terminal on the insulation monitoring device. 3.13
Functional grounding; FE
The grounding of one or more points in the system, device or equipment is for the functional needs of the device in addition to electrical safety. Note. For insulation monitoring devices, functional grounding is the measurement connection to ground. 4 Requirements
The following requirements and those given in IEC 61557-1 shall apply.
4.1 Insulation monitoring devices should be able to monitor symmetrical and asymmetrical changes in insulation resistance of IT systems. A warning should be issued when the resistance drops to a predetermined level. Note 1. When the insulation resistance of all conductors in the monitored system decreases (approximately) similarly, it indicates that symmetrical insulation degradation has occurred. And for example when one of them The insulation resistance of one conductor decreases significantly, and it exceeds that of other conductors, which indicates that asymmetric insulation degradation has occurred. Note 2. When a ground fault occurs, the so-called ground fault relay that uses voltage imbalance (voltage offset) as the only measurement criterion is not GB/T 18216 This section explains the insulation monitoring device.
Note 3. In order to meet the monitoring of the system under specific conditions, (may be necessary) a combination of several measurement methods, including asymmetric monitoring. 4.2 The insulation monitoring device should be provided with a test equipment or can provide a facility to connect the test equipment to detect the insulation monitoring Whether the device can perform its intended function. The system being monitored should not be grounded directly, and no damage to the monitoring device is allowed. This test Not used to detect response values.
4.3 Contrary to IEC 61557-1, the PE connection of the insulation monitoring device is a measurement connection and can be considered as functional earth (FE). in case Insulation monitoring devices have additional components for ground protection. The connection should be considered as protective ground (PE). 4.4 When the specified response value Ran of the insulation monitoring device is adjustable, its set value shall be designed so that it cannot be modified at will, except by using a Key, tool or password.
Note. The electrical system installation standard specifies the minimum allowable setting value of the insulation monitoring device with variable response value. 4.5 Insulation monitoring devices should include a visual warning (signal) device, or be provided with facilities to connect such devices to indicate operating status. This A device should not be equipped with a means to cut off its power. The built-in or externally connectable audible signalling device may have a reset mechanism. Make sure one After a new fault is cleared and the audible signal device is reset, it can issue an audible signal. Note. The measuring equipment that gives the indication of insulation resistance is not enough as a visual annunciator. 4.6 The maximum operating uncertainty of an insulation monitoring device is expressed in terms of relative uncertainty. Uncertainty and its limits are listed in Table 1. Table 1 Requirements applicable to insulation monitoring devices
Sign for all systems
Response time tana ≤10s, when at 0.5 × Ran and Ce = 1μF≤100s, at 0.5 × Ran and Ce = 1μF Permissible continuous additional DC voltage Ufg according to manufacturer's instructions ≤ peak 1.15 × Un, not for DC systems Peak value of measured voltage Um when at 1.1 × Un and 1.1 × Us, and RF = ∞. ≤120V Measuring current Im ≤10mA, when at RF = 0
Internal impedance Zi ≥30Ω/V rated system voltage, at least ≥15kΩ
DC internal resistance Ri ≥30Ω/V rated system voltage, at least 1.8kΩ
Allow continuous application of nominal voltage ≤ 1.15 × Un
Relative uncertainty b ± 15% of specified response value Ran
Climate and environmental conditions
Operation. c class 3k5 (IEC 60721-3-3), -5 ℃ ~ 45 ℃
Transportation. Class 2k3 (IEC 60721-3-2), -25 ℃ ~ 70 ℃
Storage. Class 1k4 (IEC 60721-3-1), -25 ℃ ~ 55 ℃
a In some IT systems, the voltage changes at a low speed (for example. an inverter system for a low-speed control process, or a DC motor with a low-speed change), Response time depends on the minimum operating frequency between the IT system and the ground. These response times may differ from those defined above. b Relative uncertainty is determined under the following reference conditions. --- Temperature. -5 ℃ ~ 45 ℃;
--- Voltage. 0% ~ 115% of nominal voltage and 85% ~ 110% of rated power supply voltage; --- Frequency. rated frequency;
--- Leakage capacitance. 1μF.
If the response value is adjustable, identify the range of response values that are not within the specified limit range, for example. use a dotted line at the limit of this range or multiple ranges Mark out. Information on relative uncertainty within the scope of work specified by the manufacturer shall be included in the document, but not including leakage capacitance greater than 1μF and the frequency is lower or higher than the rated frequency or frequency range. c Except for condensation and icing.
4.7 When the insulation monitoring device includes equipment indicating insulation resistance, the manufacturer shall indicate that the equipment is incorrect under the rated operating conditions. Degree.
4.8 According to the requirements of IEC 60664-1 and IEC 60664-3 or only IEC 61010-1..2001, the insulation monitoring device shall have Small electrical clearance and creepage distance.
Clearance and creepage distance should be selected according to the following requirements. --- Overvoltage category III;
--- pollution degree 2;
--- IMD internal circuit coated according to the requirements of IEC 60664-3, pollution degree 1. Note. For accessible parts on the enclosure, creepage distance of pollution level 3 should be recommended to withstand higher environmental requirements. 4.9 Where the insulation monitoring device uses different voltages (e.g. Us, Un), the designed clearances and creepage distances should meet the highest Voltage.
4.10 In equipment combination applications, when the electrical connection is by means of a resistive, capacitive or inductive voltage divider, the circuit is allowed to Separation (e.g. for IT systems with rated voltages above 1000V AC and 1500V DC), and In the event of a failure, such line design characteristics can also prevent the occurrence of impermissibly high contact voltages or impermissible high currents to ground. E.g, The above circuit design characteristics (see IEC 61140) can use a reliable voltage divider or a double resistor (safe impedance) in a resistor divider Form to provide additional.
4.11 Insulation monitoring devices shall comply with the relevant electromagnetic compatibility (EMC) requirements of IEC 61326-2-4. 4.12 Other requirements for insulation monitoring devices are listed in Table 1. 5 Signs and instructions for use
5.1 Logo
In addition to the signs specified in IEC 61557-1 on the insulation monitoring equipment, the following signs shall be provided. 5.1.1 The type of device and the mark of origin or the name of the manufacturer. 5.1.2 The IT system being monitored (if the insulation monitoring device is used for a specific type of IT system). 5.1.3 Wiring diagram, or the number of the wiring diagram, or the number of the operation guide. 5.1.4 Nominal system voltage Un or range of nominal voltage.
5.1.5 Nominal value of rated power supply voltage Us, or working range of rated power supply voltage. 5.1.6 Nominal frequency of rated power supply voltage Us, or working range of rated power supply voltage frequency. 5.1.7 Specify the response value Ran, or the minimum and maximum response values Ran; if applicable, specify the range of response values, within this range, relative (percent The ratio) uncertainty is higher than the values listed in Table 1.
5.1.8 Mandatory external signs, if necessary, can be listed inside the device. serial number, year of manufacture or model identification. The data given in 5.1.1 must be permanently marked on the insulation monitoring device, and the method of marking shall ensure that These signs are still clearly visible after installation.
5.2 Instructions for use
In addition to the instructions given in IEC 61557-1, the instructions should also provide the following. 5.2.1 The internal impedance Zi of the measuring line as a function of the nominal frequency. 5.2.2 When the rated supply voltage is the nominal value Us, the peak value Um of the measured voltage shall meet the requirements of Table 1. 5.2.3 When the measuring terminal is short-circuited, the maximum value Im of the measured current shall meet the requirements of Table 1. 5.2.4 Technical data for connecting the external alarm device interface, including the description of rated voltage and current, rated insulation voltage and interface functions. For contact circuits, the data should refer to the standards IEC 61810-2 or IEC 60947...

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