Static Meter for Direct Current Energy
1 Scope
This standard specifies the terms, requirements and test methods and inspection rules of static meter for direct current energy (hereinafter referred to as instrument).
This standard is only applicable to the newly manufactured instrument with input voltage not greater than 1000V.
This standard is not applicable to the following conditions:
——instrument with input voltage greater than 1000V;
——DC standard instrument;
——portable instrument.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4798.1-2005 Environmental Conditions Existing in the Application of Electric and Electronic Products - Section 1: Storage
GB/T 4798.2-2008 Environmental Conditions Existing in the Application of Electric and Electronic Products - Section 2: Transportation
GB/T 13384-2008 General Specifications for Packing of Mechanical and Electrical Product
GB/T 16935.1-2008 Insulation Coordination for Equipment within Low-voltage Systems - Part 1: Principles Requirements and Tests
GB/T 17215.211-2006 Electricity Metering Equipment (a.c.) - General Requirements, Tests and Test Conditions - Part 11: Metering Equipment
GB/T 17215.301-2007 Particular Requirements for Multi-function Electricity Meters
GB/T 17215.321-2008 Electricity Metering Equipment (a.c.) - Particular Requirements - Part 21: Static Meters for Active Energy (Classes 1 and 2)
GB/T 17215.421-2008 Electricity Metering Equipment (a.c) - Tariff and Load Control - Part 21: Particular Requirements for Time Switches
GB/T 17626.11-2008 Electromagnetic Compatibility - Testing and Measurement Techniques - Voltage Dips, Short Interruptions and Voltage Variations Immunity Tests
GB/T 17626.29-2006 Electromagnetic Compatibility(EMC) - Testing and Measurement Techniques - Voltage Dips Short Interruptions and Voltage Variations on d.c. Input Power Port Immunity Tests
GB/T 17627.1-1998 High-voltage Test Techniques For Low-voltage Equipment Part 1: Definitions, Test and Procedure Requirements
QC/T 413-2002 Technical Specification for Electronic Equipment for Automobiles
IEC 61010-1: 2010 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use – Part 1: General Requirements
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1
static meter for direct current energy
energy meter, which generates output directly proportional to the measured energy because the DC current (or voltage representing DC current) and DC voltage acts on solid (electronic) elements
Note: according to connection mode, it may be classified into direct connected meter and indirect connected meter.
3.2
direct connected meter
instrument with measuring element of voltage and current being directly connected to measured DC circuit
3.3
indirect connected meter
instrument with the measuring element of voltage or current being connected to measured DC circuit through one or more conversion devices
Notes:
1 Conversion device may be one kind among DC transducer, mutual inductor, voltage divider or splitter and may also be the composite application of them.
2 Indirect connected meter may be classified into: indirect voltage connected meter, indirect current connected meter and indirect voltage and current connected meter.
3.4
DC ripple factor
Ratio of half of the difference of pulse DC electric quantity peak and the valley to the average DC electric quantity
[GB/T 2900.33-2004, definition 551-17-29]
4 Standard Electric Quantity Value
4.1 Standard Reference Voltage
See Table 1 for the standard reference voltages of direct voltage connected instrument (including "direct connected instrument" and "indirect current connected instrument") and indirect voltage connected instrument (including "indirect voltage connected instrument" and "indirect current and voltage connected instrument").
Table 1 Standard Reference Voltage
Instrument type Standard value
V Exceptional value
V
Direct voltage connected instrument (Ub)a 60, 100, 400 and 700 1000
Indirect voltage connected instrument (Un)b 2, 4 and 100 5, 6, 8, 10 and 12
a Ub represents the reference voltage of direct voltage connected instrument.
b Un represents the reference voltage of indirect voltage connected instrument.
4.2 Standard Reference Current
See Table 2 for the standard reference currents of direct current connected instrument (including "direct connected instrument" and "indirect voltage connected instrument") and indirect current connected instrument (including "indirect current connected instrument" and "indirect current and voltage connected instrument").
Table 2 Standard Reference Current
Instrument type Standard value Exceptional value
Direct current connected instrument (Ib) a 10A, 20A and 50A 100A
Indirect current connected instrument (In) b 10mA, 20mA and 100mA 5mA, 500mA and 1000mA
Voltage type c: 75mV, 2V and 4V
a Ib represents the reference current of direct current connected instrument.
b In represents the reference current of indirect current connected instrument.
c As for the indirect current connected instrument with voltage input, the power should be calculated after converting the input voltage to standard current value.
4.3 Maximum Voltage
The maximum voltage Umax of instrument should be taken as 1.15 times of the reference voltage.
4.4 Maximum Current
The maximum current Imax of instrument should be taken as 1.2 times of the reference current.
5 Mechanical Requirements and Tests
5.1 General Mechanical Requirements
The mechanical requirements of instrument shall be in accordance with 5.1, GB/T 17215.211-2006.
On-board instrument shall also meet the requirements of QC/T 413-2002.
5.2 Enclosure
5.2.1 Requirements
The instrument enclosure shall meet the following requirements:
——the instrument enclosure shall be capable of being sealed, and only after the seal is damaged, may its inner components be touched or the instrument cover be removed;
——the nonpermanent deformation (if any) shall not disturb the normal operation of the instrument;
——unless otherwise specified, if the instrument enclosure is made of metal material wholly or partially, protective ground terminal shall be provided;
——the instrument shall be provided with window for copying, reading or observing, and the window shall be made of transparent materials;
——the terminal of instrument shall meet the requirements of electric clearance and creepage distance specified in 5.3;
——the mechanical strength of instrument enclosure shall meet the requirements of tests in 5.2.2.
5.2.2 Tests
5.2.2.1 Spring hammer test
It shall be in accordance with 5.2.2.1, GB/T 17215.211-2006.
5.2.2.2 Shock test
It shall be in accordance with 5.2.2.2, GB/T 17215.211-2006.
5.2.2.3 Vibration test
Off-board instrument shall be in accordance with 5.2.2.3, GB/T 17215.211-2006.
The on-board instrument shall be subject to the test according to the requirements of 3.12 and 4.12, QC/T 413-2002; the instrument after the test shall be free from damage and shall be able to work normally without information being changed.
5.3 Electric Clearance and Creepage Distance
The electric clearance and creepage distance of instrument shall be in accordance with those specified in Tables 3 and 4.
The overvoltage category in the place where the instrument is used shall be determined according to the requirements of 4.3.3.2, GB/T 16935.1-2008.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Standard Electric Quantity Value
4.1 Standard Reference Voltage
4.2 Standard Reference Current
4.3 Maximum Voltage
4.4 Maximum Current
5 Mechanical Requirements and Tests
5.1 General Mechanical Requirements
5.2 Enclosure
5.3 Electric Clearance and Creepage Distance
5.4 Category II Instrument Encapsulated with Protective Insulation
5.5 Heat Resistance and Flame Retardance
5.6 Dust Prevention and Waterproofing
5.7 Display of Measured Value
5.8 Output Device
5.9 Mark of Instrument
5.10 Appearance Inspection
6 Climate Conditions
6.1 Temperature Range
6.2 Relative Humidity
6.3 Climate Environment Influence Test
7 Electrical Requirements
7.1 Voltage Influence
7.2 Power Consumption
7.3 Short-term Overcurrent Influence
7.4 Self-heating Influence
7.5 Temperature Rise
7.6 Insulation Resistance
7.7 AC Voltage Test
7.8 Impulse Voltage Test
7.9 DC Ripple Influence Test
7.10 Reversed Polarity Connection of Voltage Circuit
8 Accuracy
8.1 Test Reference Condition
8.2 Intrinsic Error
8.3 Intrinsic Error Limit under Reference Voltage
8.4 Intrinsic Error Limit under Reference Current
8.5 Error Change Caused by Influence Quantity
8.6 Start and Creeping
8.7 Instrument Constant
8.8 Clock Timing Error
8.9 Power Supply Voltage Change
9 Electromagnetic Compatibility (EMC)
9.1 Radio Interference Rejection
9.2 Fast Transient Burst Immunity Test
9.3 Radio-frequency Electromagnetic Field Radiation Immunity Test
9.4 Immunity Test of Conducted Disturbances Induced by Radio-frequency Field
9.5 Electrostatic Discharge Immunity Test
9.6 Surge Immunity Test
9.7 External Constant Magnetic Induction Influence Test
9.8 External Power Frequency Magnetic Field Influence Test
10 Data Safety
11 Inspection Rules
11.1 End-of-manufacturing Inspection
11.2 Type Inspection
12 Packaging, Storage and Transportation
Annex A (Informative) Test Items and Sequence
Annex B (Normative) Test Voltage Waveform of Voltage Dip and Short Interruption Influence
Figure B.1 1s Voltage Interruption with AC Power Supply ΔU= 100%
Figure B.2 Voltage Interruption with AC Power Supply ΔU= 100% and Rated Frequency of One Cycle
Figure B.3 1min Voltage Dip with AC Power Supply ΔU= 50%
Figure B.4 1s Voltage Interruption with DC Power Supply ΔU= 100%
Figure B.5 0.3s Voltage Interruption with DC Power Supply ΔU= 100%
Figure B.6 1s Voltage Dip with DC Power Supply ΔU= 60%
Table 1 Standard Reference Voltage
Table 2 Standard Reference Current
Table 3 Electric Clearance
Table 4 Creepage Distance
Table 5 Temperature Range
Table 6 Relative Humidity
Table 7 Measured Voltage Range
Table 8 AC Test Voltage
Table 9 Impulse Test Voltage
Table 10 Test Reference Condition
Table 11 Intrinsic Error Limit under Reference Voltage
Table 12 Intrinsic Error Limit under Reference Current
Table 13 Percent Error Change Limit Caused by Influence Quantity
Table 14 Starting Current Value of Instrument
Table A.1 Test Items and Sequence
