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National Standards Technical Committee for Electrical Measuring Instruments (SAC/TC 104) is in charge of this English translation. In case of any doubt about the contents of English translation, the Chinese original shall be considered authoritative.
The GB/T 17215.3 Electricity metering equipment (a.c.) – Particular requirements consists of the following parts under the general title:
——GB/T 17215.301 Part 1: Particular requirements for multi-function electricity meters;
——GB/T 17215.302 Part 2: Static harmonic meters for active energy;
——GB/T 17215.303 Part 3: Digital input electricity meters;
——GB/T 17215.304 Part 4: Static meters connected via electronic instrument transformer;
——GB/T 17215.311 Part 11: Electromechanical meter for active energy (classes 0.5, 1 and 2);
——GB/T 17215.321 Part 21: Static meters for active energy (classes 1 and 2);
——GB/T 17215.322 Part 22: Static meters for active energy (classes 0.2S and 0.5S);
——GB/T 17215.323 Part 23: Static meters for reactive energy (classes 2 and 3);
——GB/T 17215.324 Part 24: Static meters for reactive energy at fundamental frequency (classes 0.5S, 1S and 1);
——GB/T 17215.352 Part 52: Symbols.
This part is Part 4 of GB/T 17215.3.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part and GB/T 17215.211-2006 Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 11: Metering equipment together form a series of associated national standards supporting the type test requirements of static meters connected via electronic transformer.
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This part was proposed by the China Machinery Industry Federation.
This part was prepared by SAC/TC 104 National Standards Technical Committee for Electrical Measuring Instruments.
Electricity metering equipment (a.c.) - Particular requirements - Part 4: Static meters connected via electronic transformer
1 Scope
This part of GB/T 17215.3 specifies the terms and definitions, classification, technical requirements, accuracy classes and test methods of static meters connected via electronic transformer (hereinafter referred to as the "meters").
This part is only applicable to newly manufactured meters which have small (signal) analog input and are installed in the networks with a reference frequency of 50Hz or 60Hz to measure the a.c. electric energy and it applies to their type tests only.
This part is applicable to the meters consisting of elements such as measuring unit and display enclosed together in a meter case.
This part may be used as reference for the meters that have a small (signal) analog input only in the current circuit.
This part is not applicable to the meters with digital inputs.
Note: For the transformers to which the meters are intended to be connected, see GB/T 20840.7-2007, GB/T 20840.8-2007, and DL/T 1155-2012.
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 15284-2002 Particular requirements for multi-rate electricity meters
GB/T 17215.211-2006 Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 11: Metering equipment
GB/T 17215.322-2008 Electricity metering equipment (a.c.) - Particular requirements - Part 22: Static meters for active energy (classes 0.2S and 0.5S)
GB/T 17215.323-2008 Electricity metering equipment (a.c.) - Particular requirements - Part 23: Static meters for reactive energy (classes 2 and 3)
GB/T 17215.421-2008 Electricity metering equipment (a.c.) - Tariff and load control - Part 21: Particular requirements for time switches
GB/T 17626.4-2008 Electromagnetic compatibility - Testing and measurement techniques - Electrical fast transient/burst immunity test
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 - Testing and measurement techniques - Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests
GB/T 20840.2-2014 Instrument transformers - Part 2: Additional requirements for current transformers
GB/T 20840.3-2013 Instrument transformers - Part 3: Additional requirements for inductive voltage transformers
GB/T 20840.7-2007 Instrument transformers - Part 7: Electronic voltage transformers
GB/T 20840.8-2007 Instrument transformers - Part 8: Electronic current transformers
DL/T 1155-2012 Specification for non-traditional current and voltage transformers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 17215.211-2006 and the following apply.
3.1
electronic transformer
a generic term for electronic instrument transformers and non-traditional transformers
3.2
electronic instrument transformer
a kind of device consisting of one or more current or voltage sensors that are connected to a transmission system and a secondary converter and used to transmit a quantity that is proportional to the quantity subjected to measurement so as to power the measuring apparatuses and meters and the relay protection or control devices
[GB/T 20840.7-2007, definition 2.1.1]
3.3
current circuit
a part of the internal connection and measuring units of the meter, of which the current characteristics are characterized by the small (signal) analog voltage UI applied to it
Note: It is revised from the GB/T 17215.211-2006, definition 3.2.6.
3.4
voltage circuit
a part of the internal connection and measuring units of the meter, of which the voltage characteristics are characterized by the small (signal) analog voltage UU applied to it
Note: It is revised from the GB/T 17215.211-2006, definition 3.2.7.
3.5
extra-low voltage; ELV
voltage between the conductors or between any conductor and earth, which does not exceed 50V a.c. or 120V ripple free d.c. (voltage band 1 as specified in GB/T 18379-2001)
[GB 19212.1-2008, definition 3.7.15]
3.6
voltage correspond to starting current
UI,st
an analog voltage value that is continuously counted when the meter is started and characterizes the starting current
3.7
voltage correspond to rated current
UI,n
an analog voltage value that determines the relevant characteristics of the meter and characterizes the rated current
3.8
voltage correspond to maximum current
UI,max
an analog voltage value that characterizes the maximum current, with the meter being able to meet the accuracy requirements of this part
3.9
voltage correspond to reference
UU,n
an analog voltage value that determines the relevant characteristics of the meter and characterizes the reference voltage
4 Standard electric quantities and classification of meters
4.1 Standard electric quantities
4.1.1 Standard voltage correspond to reference
See Table 1 for the standard voltage correspond to reference of the meter. Unless otherwise stated, the terms "voltage" and "current" refer to the root-mean-square values (r.m.s.).
Table 1 Standard voltage correspond to reference
In: V
Voltage correspond to reference Standard value Exceptional value
UU,n ; 2; ; 4
; 1.625; ; 3.25; ; 6.5
4.1.2 Standard voltage correspond to rated current
See Table 2 for the standard voltage correspond to rated current of the meter.
Table 2 Standard voltage correspond to rated current
In: V
Voltage correspond to rated current Standard value Exceptional value
UI,n 4 2
4.1.3 Voltage correspond to maximum current
When the meter is operated via electronic current transformer, it shall be noted that the measuring range of the meter's current circuit matches the rated secondary output of the electronic current transformer. The voltage correspond to maximum current of the meter is 1.2UI,n, 1.5UI,n, 2UI,n, 4UI,n or 5UI,n, with 1.2UI,n as the preferred value.
4.1.4 Standard reference frequency
The standard value of the reference frequency is 50Hz or 60Hz.
4.2 Classification of meters
4.2.1 According to the connection methods, the meters are classified into:
——three-phase three-wire meter;
——three-phase four-wire meter.
4.2.2 According to the accuracy classes, the meters are classified into:
——meter for active energy (class 0.2S);
——meter for active energy (class 0.5S);
——meter for reactive energy (class 2).
Note: The class S meters have a measuring range of 1%UI,n~UI,max, so they shall be used together with special-purpose current transformers. For details of special-purpose current transformers, see GB/T 20840.8-2007, 12.2.
4.3 Electric quantity accumulation methods of meters
The meter should accumulate and display the electric quantity with the standard value of the rated secondary current/voltage of electromagnetic transformer (see GB 20840.2-2014, 5.202 and GB 20840.3-2013, 5.301.2). However, other application methods are not excluded, for example, the meter accumulates and displays the electric quantity with the standard value of rated primary current/voltage of electronic transformer.
5 Mechanical requirements
5.1 General
In addition to conforming to GB/T 17215.211-2006, Clause 5, the meters shall also meet the following requirements.
5.2 Marking of meters
5.2.1 Nameplate
In addition to conforming to GB/T 17215.211-2006, 5.12, the meters shall also be marked with the following:
a) Voltage correspond to reference:
Example 1:
3×1.155/2V or 3×2.309/4V.
b) Voltage correspond to rated current and voltage correspond to maximum current:
Example 2:
4(4.8)V.
c) The reference voltage, rated current and maximum current of the meter to accumulate and display the electric quantity are indicated in square brackets:
Example 3:
3×1.155/2V[57.7/100V] or 3×2.309/4V[57.7/100V];
4(4.8)V[1(1.2)A] or 4(4.8)V[5(6)A].
d) Voltage (value) of external power supply.
e) The rated load range of the electronic transformer intended to be connected shall be marked.
5.2.2 Numbering of wiring terminal
For each meter, the access circuit shall be permanently indicated, and the phase sequence, function and terminal number of such circuit shall be indicated in the circuit diagram. The terminal number shall be written in accordance with the rules that 2, 5 and 8 are for the voltage circuit, 1, 3; 4, 6; and 7, 9 for the current circuit, and 10 (11, 12) for the "earth".
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Standard electric quantities and classification of meters
4.1 Standard electric quantities
4.2 Classification of meters
4.3 Electric quantity accumulation methods of meters
5 Mechanical requirements
5.1 General
5.2 Marking of meters
6 Climatic conditions
7 Electrical requirements
7.1 General
7.2 Measurement circuit
7.3 Power supply voltage influence
7.4 Short-time overvoltage influence of current circuit
7.5 Insulation
7.6 Electromagnetic compatibility
8 Accuracy requirements
8.1 Limits of error due to variation of voltage on the current circuit
8.2 Limits of error due to other influence quantities
8.3 Accuracy of clock (if any)
8.4 Combined error of electric energy indication (if any)
8.5 Demand indication error (if any)
8.6 Test of starting and no-load condition
8.7 Meter constant
8.8 Accuracy test conditions
9 Arrangement of test data
Annex A (Normative) Test voltage waveforms for effect of voltage dips and short interruptions
Annex B (Normative) Harmonic test
Annex C (Informative) An accuracy test method
Bibliography
Figure A.1 Voltage interruption with △Ua.c.=100% for a period of 1s
Figure A.2 Voltage interruption with △Ua.c.=100% for a period of one cycle of the rated frequency
Figure A.3 Voltage dip with △Ua.c.=50% for a period of 1min
Figure A.4 Voltage interruption with △Ud.c.=100% for a period of 1s
Figure A.5 Voltage interruption with △Ud.c.=100% for a period of 0.3s
Figure A.6 Voltage dip with △Ud.c.=60% for a period of 1s
Figure B.1 Test circuit diagram
Figure B.2 Amplitude of square wave
Figure B.3 Amplitude of peaked wave
Figure B.4 Burst fired waveform
Figure B.5 (Incomplete) Fourier analysis of burst fired waveforms
Figure C.1 Accuracy test method via a standard signal converter
Bibliography
Table 1 Standard voltage correspond to reference
Table 2 Standard voltage correspond to rated current
Table 3 External supply voltage
Table 4 Percentage error limits (polyphase meters carrying balanced loads)
Table 5 Percentage error limits (polyphase meters carrying single-phase load, but with balanced polyphase voltages applied to the voltage circuits)
Table 6 Mean temperature coefficient limits of errors
Table 7 Limits of variation in percentage error due to influence quantity
Table 8 Square waveform
Table 9 Peaked waveform
Table 10 Value of D for the test of meter no-load condition
Table 11 Voltage correspond to starting current
