This standard applies only to the latest manufactured 0.5, 1 and 2 class induction watt-hour meters for measuring AC electrical energy in the frequency range of 45 to 65 Hz and their type inspection1). This standard also applies to meter assemblies and accessories, including built-in current transformers. This standard does not apply to maximum demand indicators (see the translation of IEC Publication No. 211). This standard does not apply to any measuring device used for remote measurement of electrical energy. This standard does not apply to meters for test purposes or special types of watt-hour meters (such as excess meters), except for multi-rate meters. This standard does not apply to watt-hour meters with terminal voltages exceeding 600V (line-to-line voltage for meters used in three-phase systems). GB/T 15283-1994 0.5, 1 and 2 class AC active watt-hour meters GB/T15283-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
0.5, 1 and 2 class alternating current active watthour meters
Class 0. 5, 1 and 2 alternating current watthour metersGB/T 15283-
IEC 521--1988
Replaces GB39241983
This standard is equivalent to the second edition (1988) of the International Electrotechnical Commission (IEC) 521 publication "0.5, 1 and 2 class alternating current watthour meters" 1 Scope
This standard is only applicable to the latest manufactured 0.5, 1, 2 class induction watthour meters (hereinafter referred to as meters) for measuring alternating current energy in the frequency range of 45~65Hz and their type inspection\. Note: 1) The acceptance issues of class 2 watthour meters are specified in GB3925 (IEC 514 publication). This standard also applies to the assembly and accessories of the meter, including the built-in current transformer. This standard does not apply to maximum demand indicators (see the translation of IEC Publication No. 211).
This standard does not apply to any measuring device used for remote measurement of electrical energy. This standard does not apply to meters used for test purposes or special types of watt-hour meters (such as overmeters), except for multi-rate meters. This standard does not apply to watt-hour meters with terminal voltages exceeding 600 V (line-to-line voltage for meters used in three-phase systems). Note: ① Portable and outdoor meters may have additional requirements. ② Reactive watt-hour meters, see GB/T 15282 (IEC Publication No. 145). 2 Units
This standard uses the units used by the International Electrotechnical Commission 3 Definitions
Most of the following definitions are taken from Chapters 301, 302 and 303 of the International Electrotechnical Vocabulary (IEV) [IEC Publication No. 50 (301, 302, 303)), and the corresponding International Electrotechnical Vocabulary (IEC) clause numbers are marked. In order to enhance understanding, some new definitions have been added to this standard and some IEV definitions have been modified.
3.1 Watt-hour meter
A meter that measures active electrical energy by accumulating active power over a certain period of time (IEV301-04-17 has been modified). 3.2 Induction meter
A meter that generates torque by the interaction between the current in a fixed coil and the current induced by a conductive movable part (usually a disk). 3.3 Multi-rate meter An energy meter equipped with multiple meters, each meter working for a specified time corresponding to a different rate (IEV302-0406).
3.4 ​​Meter rotor
The movable part of the meter, on which the magnetic flux of the fixed winding and the magnetic flux of the brake element act and drive the meter to work. 3.5 Meter driving element The working part of the meter, which generates torque by the action of its magnetic flux and the current induced in the movable part. Generally composed of an electromagnet with a control device.
Approved by the State Administration of Technical Supervision on December 7, 1994 142
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Standardized for free travel
Implemented on May 1, 1995
GB/T15283-94
3.6 Meter braking element Meter component that generates braking torque by the action of its magnetic flux and the induced current in the movable part. It consists of one or more magnets and their adjustment devices.
3.7 Meter register (counting mechanism) Meter component that can determine the measured value (IEV302-06-03 has been modified). 3.8 Meter base Meter base
The back of the meter, which is generally used to fix or install the base terminal or terminal seat and the case. The bottom of the embedded installation meter can also include the side of the meter case. 3.8.1 Meter socket
Accessory for detachable watt-hour meters with a terminal socket (hole) that has some connectors for connecting the line conductor terminals. This accessory can be a single-position socket for one watt-hour meter or a multi-position socket for two or more meters. 3.9 Meter cover
The housing located in front of the meter, made of fully transparent material, or made of opaque material with a window through which the rotor can be seen and the meter reading can be read.
3.10 Meter case
Consists of a base and a cover.
3.11 Meter frame
Used to fix the drive components, rotor bearings, meter, usually also install brake elements, and sometimes also install adjustment devices. 3.12 Accessible conducting part When the meter is installed for use, it can be touched with a standard test finger. 3.13 Protective earth terminal Terminal connected to the accessible conductive parts of the instrument for safety purposes. 3.14 Terminal block Support made of insulating material, on which all or part of the terminals of the instrument are assembled. 3.15 Terminal cover
Cover covering the terminals of the instrument, generally also covers the terminals of the external wires or cables connected to the terminals. 3.16 Current circuit Windings of driving components and internal wiring of the instrument, through which the current of the line connected to the instrument flows. Note: When the instrument is equipped with a current transformer, the current circuit also includes the transformer winding. 3.17 Voltage circuit
Windings of driving components and internal wiring of the instrument, the voltage applied to it is the line voltage connected to the instrument. 3.18 Auxiliary circuit Wiring of components (windings, lights, relays, etc.) installed in the instrument case and their auxiliary devices used to connect external equipment, clocks, relays and pulse counters.
3.19 Basic current (I,) basic current (I,) determines the current value of the relevant characteristics of the instrument.
3.20 Rated maximum current (Imax) rated maximum current (Imax) The maximum current value of the instrument that can meet the accuracy specified in this standard. 3.21 Reference voltage) reference voltage determines the voltage value of the relevant characteristics of the instrument.
Note: 1) Voltage and current values ​​refer to root mean square values, unless otherwise specified. 3.22 Reference frequency determines the frequency value of the relevant characteristics of the instrument.
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3.23 Basic speed basic speed
GB/T 15283--94
The nominal speed of the rotor rotation expressed in revolutions per minute when the basic current and power factor are 1 under reference conditions. 3.24 Basic torque basic torque
The nominal value of the rotor torque at rest when the basic current and power factor are 1 under reference conditions. 3.25 Meter constant meter constant
The constant indicating the relationship between the electric energy recorded by the meter and the corresponding number of rotor revolutions, expressed in revolutions per kilowatt-hour (r/kW·h). Or watt-hours per revolution (Wh/r).
3.26 Reference temperature referencetemperature The ambient temperature specified as the reference condition. 3.27 Clearance clearance
The shortest spatial distance between conductive parts.
3.28 Creepage distance The shortest distance measured along the insulating surface between conductive parts. 3.29 Insulation
3.29.1 Basic insulation Basic insulation Applicable to the insulation of live parts as the basic protection against electric shock. Note: Basic insulation does not necessarily include insulation used only for functional purposes. 3.29.2 Supplementary insulation Supplementary insulation An independent insulation added to basic insulation so that it can still resist electric shock when the basic insulation fails. 3.29.3 Double insulation Double insulation Insulation consisting of both basic insulation and supplementary insulation. 3.29.4 Reinforced insulation A single insulation system providing live parts with the same protection against electric shock as double insulation. NOTE: "Insulation system" does not mean that the insulation should be a homogeneous material, it can consist of several layers and cannot be tested separately as supplementary insulation or basic insulation. 3.29.5 Insulating encased meter of protective-class I A meter with a case of insulating material that relies not only on basic insulation for protection against electric shock, but also has safety measures such as double insulation or reinforced insulation, but does not specify protective earthing or installation conditions that are dependent on it. o Type type
This term is used to define the design of a specific meter made by one manufacturer, which should have the following characteristics: a. The same metrological characteristics;
The same consistent component structure that determines these characteristics; b.
c. The current winding has the same ampere-turns at the basic current and the voltage winding has the same turns per volt at the reference voltage: d. The maximum current has the same ratio to the basic current. The type can have several basic current values ​​and several reference voltage values. The manufacturer may name the instrument with one or more groups of letters or numbers, or a combination of letters and numbers. Each type has only one name. Note: () The type is represented by a sample table used for type inspection, and its characteristics (basic current and reference voltage) are selected by the manufacturer from a given table. ② When the derived ampere-turns are non-integer turns, the product of the number of winding turns and the basic current value may be different from the value representing the sample table of the type. In order to obtain an integer number of turns, it is allowed to select the previous or next turn value that is close. Therefore, the turns of the voltage winding can be different per volt, but it cannot be greater than 20% of the value of the sample table of the type.
③ The ratio of the highest to the lowest basic speed of the rotor of each instrument of the same type should not exceed 1.5. 3.31 Type test type test
An inspection conducted to inspect a certain characteristic of a certain type of instrument under specified conditions. 3.31.1 Type approval procedure Type approval procedure 144
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GB/T 15283-94
One or a small number of instruments of the same type with the same characteristics selected by the manufacturer shall be subject to a series of type inspections according to this procedure. This is to verify whether each type of instrument meets all the technical requirements for each grade of instrument specified in the standard. 3.31.2 Qualification procedure One or a small number of instruments of the same type with the same characteristics selected randomly shall be subject to type inspections according to this procedure to verify whether the instrument type has any serious system abnormalities. The correct number of tests and instruments to be inspected shall be negotiated by both parties. Note: In practice, when two of the three instruments inspected meet the relevant requirements of the inspection described in this standard, it is considered that there are no serious system abnormalities. 3.32 Percent error percentage error The percentage error is determined by the following formula:
Percent error = Instrument recorded energy value Actual energy value × 100 Actual energy value
Note: Because it is impossible to determine the true value, an approximate value with a specified uncertainty value can be used. This value can be agreed upon by the manufacturer and the user or given by the national standard.
3.33 Error change caused by an influence quantity variation of error due to an influence quantity The difference in the percentage error of the instrument when only one influence quantity takes two specified values ​​(one of which is the reference value) in sequence. 3.34 Influence quantity or influence factor influence quantity or factor is usually any quantity or any factor that affects the performance of the instrument from outside the instrument (IEV301-08-09 has been modified). 3.35 Distortion factor distortion factor The ratio of the root mean square value of the harmonic component (non-sinusoidal AC quantity minus the fundamental wave) to the root mean square value of the non-sinusoidal quantity. The distortion factor is usually expressed as a percentage.
3.36 Mean temperature coefficient The ratio of the change in percentage error to the change in temperature that produces this change. 3.37 Vertical working position The position of the instrument when the rotor axis is vertical.
3.38 Class index
The figure giving the permissible percentage error limit for all current values ​​between 0.1Ih and 1.nax and a power factor of 1 (for three-phase instruments, for nearly balanced load) when the instrument is tested according to the reference conditions specified in this standard (including the permissible deviation of the reference value). 4 Classification
In this standard, instruments are classified according to their respective class indices, namely 0.5, 1 and 2. 5 Mechanical requirements
5.1 General requirements
The design structure of the instrument should avoid causing any danger under normal conditions and normal use, especially ensuring: "-- Personal safety against electric shock:
- Personal safety against overheating,
Safety against the spread of flames.
All parts susceptible to corrosion should be effectively protected under normal working conditions. Any protective layer should not be damaged by normal operation under normal working conditions, nor should it be damaged by exposure to the air. The instrument should have sufficient mechanical strength and be able to withstand the high temperatures that may occur under normal working conditions. The components should be securely fastened and ensured to be free from loosening. The electrical wiring should be prevented from breaking, including under certain overload conditions specified in this standard. The structure of the instrument should minimize the risk of insulation short circuit between live parts and accessible conductive parts caused by accidental loosening of wiring, screws, etc.
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5.2 Case
GB/T 15283--94
The instrument shall have a suitable dustproof case and shall be lead-sealed. The internal parts of the instrument can only be touched after the lead seal is removed. The cover cannot be opened without using tools, coins or any similar tools. The structure and installation of the case shall not hinder the smooth operation of the instrument in any non-permanent deformation. The mechanical strength of the case is tested with a spring hammer (see GB4706.1, Article 21.1 (IEC817 publication)]. The instrument is placed in the normal working position and the spring hammer is 0.22 A kinetic energy of 0.05 N·m acts on the outer surface of the meter cover (including the window) and the terminal cover. If there is no damage to the meter case and the terminals that may affect the function of the instrument, the test result is qualified. The case of a Class 0.5 instrument should be designed so that when installed according to the manufacturer's instructions, the instrument should not deviate from the vertical position by more than 0.5° in all directions (see Note 2 of Table 10 of Article 8.1).
Unless otherwise specified, for instruments connected to the power supply mains, the voltage of the power supply mains to ground under normal conditions is 250V or more. When the case is made of metal material in whole or in part, a protective earth terminal shall be provided. 5.3 Window
If the case is non-transparent, one or more windows shall be provided for reading the meter and observing the rotor. The window shall be covered by a transparent plate and the plate shall not be removed without removing the seal.
5.4 Terminals, terminal blocks, protective earth terminals The terminals can be assembled in one or more terminal blocks. The terminal blocks shall have sufficient insulation performance and mechanical strength. In order to meet this requirement, appropriate material tests shall be considered when selecting the insulating material for the terminal blocks. The material used to make the terminal blocks shall be able to pass the 135C temperature test specified in GB1634 (ISO No. 75). The hole of the insulating material forming the extension of the terminal hole shall be of sufficient size to accommodate the insulation of the conductor. Unless otherwise specified by the user, the relevant voltage terminal shall be easily disconnected from the input current terminal. The fixing method of the wire to the terminal shall ensure sufficient and lasting contact so that there is no risk of loosening or causing heat. Screws that transmit contact forces and fixing screws that are tightened and loosened several times during the life of the instrument should be screwed into metal nuts. The electrical connection should be designed so that the contact pressure is not transmitted through the insulating material. The gap and creepage distance of the terminal block and the gap and creepage distance between the terminal and the surrounding part of the metal shell shall not be less than the values ​​specified in Table 1 corresponding to the working voltage under reference conditions. Table 1 Gap and creepage distance
Voltage, V
25 or less
61~250
251~450
451~600
Gap, mm
For current lines, this voltage is deemed to be the same as the voltage of the corresponding voltage line. Creepage distance.mm
Terminals with different potentials assembled close to each other should be protected to prevent accidental short circuits. They can be protected by insulating layers. The terminals of a current path should be considered to have the same potential. The terminals, wire fastening screws and internal or external wires should not contact the metal terminal cover. If the terminal cover is made of metal material, when the terminal screw is tightened to the position equivalent to fixing the largest wire, the distance between the terminal cover and the top of the screw should not be less than the relevant value shown in Table 1. If there is a protective earthing terminal, it should:
be electrically connected to accessible metal parts;
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b. If possible, be an integral part of the meter base; c. It is best to be located near the terminal block;
GB/T 15283·94
d. Accommodate a wire with a cross-sectional area at least equal to that of the main current wire, with a lower limit of 6mm2 and an upper limit of 16mm (this size is only applicable to the use of copper wire):
e: Clearly marked with the grounding symbol.
Note: 1) See GB6738 (IEC414 publication). All parts of each terminal should minimize the risk of corrosion caused by contact with other metal parts. After the instrument is installed, it is impossible to loosen the protective grounding terminal without tools, coins or similar instruments. 5.5 Terminal cover
If the instrument terminal is combined in a terminal block, it should have a separate cover plate, which should be sealed with a separate lead seal. The terminal cover should cover the physical terminal, the wire fixing screws, and, unless otherwise specified, the appropriate length of the external wire and its insulation. When the instrument is used for panel mounting, the terminal cannot be touched without opening the seal of the terminal cover. 5.6 Insulated and Enclosed Class II Protection Instruments
Instruments (including terminal covers) with a solid housing made entirely of insulating material, with all metal parts except nameplate screws, hanging and rivet small parts enclosed. If these small parts are accessible from the outside of the case with a standard test finger, as specified in GB4208 (IEC529 publication), these small parts should be separated from live parts by additional insulation to prevent damage to the basic insulation or loosening of live parts.
Paint, porcelain, ordinary cotton paper, oxide film on metal parts, adhesive tape and sealing compounds or similar unstable materials on metal parts are not sufficient as additional insulation. For the terminal blocks and terminal covers of such instruments, reinforced insulation can meet the requirements. 5.7 Non-flammability
Terminal blocks, terminal covers and cases should have safety measures to ensure the prevention of flame spread. The terminal block, terminal cover and meter case should not ignite due to contact with overheated live parts. These parts in contact with live parts should meet the hot wire test conditions [see GB5169.4 (IEC695-2-1 publication)], and the temperature is as follows: a. Terminal block: 960±15℃; b. Terminal cover and meter case: 650±10℃. The hot wire can contact any part. If the terminal block and the meter base are an integral whole, only the terminal block needs to be tested. 5.8 Meter (Counting Mechanism) The meter can be drum type or pointer type. The basic unit recorded by the meter should be watt-hour (kW·h) or megawatt-hour (MW·h). In a drum meter, the basic unit recorded by the meter should be marked adjacent to the drum assembly. In a drum meter, only the last drum, that is, the rightmost drum, can rotate continuously. In pointer type meters, the units recorded by the meter shall be marked adjacent to the unit dial in the form of 1 kW·h/div or 1 MW·h/div. Multiples of 10 may be marked adjacent to the dial. For example, for meters measuring in watt hours, the unit dial shall be marked with 1 kW:h/div and the other dials adjacent to the unit dial to the left shall be marked with 10-100-1000, etc. The continuously rotating drum, or the dial indicating the lowest value, shall be graduated and numbered in a division, each division shall be subdivided into ten parts or any other arrangement that ensures the same reading accuracy. The drum of a drum meter indicating a fraction of a unit or the dial of a pointer meter, if readable, shall be circled in color to indicate the color itself!
The meter shall be capable of recording at least 1500 h starting from zero and recording electrical energy at the rated maximum current at a reference voltage and power factor of 1. Any higher value may be agreed between the parties concerned. The markings on the counter shall be indelible and easy to read. 5.9 Rotor marking for the direction of rotation
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GB/T 15283--94
The observer looks at the instrument from the front and the edge of the rotor closest to the observer rotates from left to right, as the forward meter. The direction of rotation shall be marked with a clear arrow.
The edge and/or top of the disc shall be marked with easily identifiable markings to facilitate recording of the number of revolutions. Other markings for stroboscopic or other tests may also be added. The location of such markings shall not interfere with the use of visible markings for photoelectric revolution counting. 6 Electrical requirements
6.1 Basic current of standards
Table 2 Basic current of standards
Directly connected
Connected via current transformer
Basic current of standards, A
5101520304050
0.20.30.611.52.55
The rated maximum current of the instrument should be the same as the rated extended secondary current of the current transformer. 6.2' Standard reference voltage
Table 3 Standard reference voltage
Direct connection
Connection through voltage transformer
Standard reference voltage, V
127--220-230-240-380-400--41548057.7-63.5.--100---110----115--120.--.-173---190--200
Note: The underlined voltage is different from the value specified in GB156 (IEC.38 publication) Phase 6.3 Power loss
Voltage line
Exception value, V
120--200-- 277--500-- 600
At the reference voltage, reference temperature and reference frequency, the active power and apparent power loss of each voltage line of the instrument shall not exceed the values ​​shown in Table 4.
Table 4 Power loss
Current line
3W and 12VA
3W and 12V·A
Instrument level
2W and 8V-A
2W and 10V-A
At the basic current, reference frequency and reference temperature, the apparent power lost per current line of the directly connected instrument shall not exceed the values ​​shown in Table 5 for instruments with a basic current lower than 30A. At the reference temperature and reference frequency, the apparent power lost per current line of the instrument used through the current transformer shall not exceed the values ​​shown in Table 5 when its current value is equal to the rated secondary current value of the corresponding transformer. 148
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GB/T15283-94
Apparent power loss
Instrument level
Note: Rated secondary current is the secondary current value of the current transformer, and the characteristics of the transformer are based on this value. The standard value of the rated extended secondary current is 120%, 150% and 200% of the rated secondary current.
6.4 Temperature rise
Under normal use conditions, the winding and insulation should not reach a temperature that has an adverse effect on the operation of the instrument. Add the rated maximum current to each current circuit of the instrument, and add 1.2 times the reference voltage to each voltage circuit (and the auxiliary voltage circuit with a power-on duration longer than the thermal time constant). The temperature rise of each component shall not exceed the values ​​shown in Table 6 when the ambient temperature does not exceed 40℃. The test time should be 2h as a cycle. The instrument should not be placed in a ventilated place or exposed to direct sunlight. Table 6 Temperature rise
Instrument components
External surface of the instrument
Temperature rise.℃
After the test, the instrument shall not be damaged and shall meet the voltage test specified in Articles 6.5.2 and 6.5.3. In addition to the requirements for the temperature rise of the windings specified in Table 6, the insulating material shall meet the corresponding requirements of GB11021 (IEC Publication No. 85). The temperature rise of the windings shall be determined by the resistance method (see GB3952.1 (IEC Publication No. 28) and shall be measured at the connection points between the current winding and each terminal.
For line resistance measurement, the cable used to energize the instrument shall be about 1m long and its cross-sectional area shall be such that the current density is less than 4A/mm. 6.5 Dielectric properties
The instrument together with its auxiliary devices (if any) shall maintain sufficient dielectric quality under normal use conditions, taking into account the influence of the atmosphere and the different voltages under normal use conditions. Therefore, the instrument shall be able to withstand Articles 6.5.2 and 6.5.3. The voltage test specified in Article 3. The test should be carried out with the complete instrument, which should be equipped with a meter cover (unless otherwise specified) and a terminal cover, and the screws should be screwed into the position of the terminal that can fix the thickest wire.
This test is only carried out once for a meter according to the procedure specified in GB311 (IEC Publication No. 60). In the type test, the dielectric property test is only valid for the arrangement of the terminal of the instrument that has undergone this test. When the terminal arrangement is different, all dielectric property tests should be repeated.
For this test, the term "ground" has the following meanings: a. When the case is made of metal, the "ground" is the case itself installed on a flat conductive surface. b. When the case is made of insulating material in whole or in part, the "ground" is a conductive foil surrounding the instrument and connected to the flat conductive plane on the bottom of the meter. At the terminal cover, this conductive foil should be close to the terminal and the hole for fixing the wire, and the distance should not exceed 10 2cm. In the impulse voltage and AC voltage tests, the non-test circuit should be connected to the base frame or to the specified "ground". First, the impulse voltage test is carried out, followed by the AC voltage test. No arc, discharge or breakdown should occur during this test. After the test, the change in the percentage error of the instrument should not be greater than the measurement uncertainty. In this clause, "all terminals" refers to the entire combination of terminals for current circuits, voltage circuits and auxiliary circuits with a reference voltage of more than 40V.
6.5.1 General conditions for dielectric quality test
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GB/T 15283--94
This test should be completed under normal use conditions, and the insulation quality should not be impaired by dust or abnormal humidity during the test. Unless otherwise specified, the normal conditions for insulation test are:
- Ambient temperature 15 ~ 25℃;
- Relative humidity 45% ~ 75%;
- Atmospheric pressure 86 ~ 106kPa (860 ~ 1060mbar). 6.5.2 Impulse voltage test
Impulse voltage test is to determine the ability of the instrument to withstand short-term high voltage without damage. Note: The purpose of the test in 6.5.2.1 is to basically ensure the insulation quality of the inter-turn or inter-layer voltage winding on the one hand, and on the other hand to basically ensure the insulation between different lines of the instrument connected to different phase conductors on the power grid during normal operation, which may be overvoltage. 6,5.2.2 is a test for comprehensive inspection of the insulation status of all lines of the instrument to the ground. This insulation status represents the basic safety factor for personnel when the network is overvoltage.
The power of the generator used for this test should be in accordance with the relevant requirements of GB311 (IEC Publication No. 60). The impulse waveform is a standard 1.2/50 waveform with a peak value of 6kV. In each test, the impulse voltage is applied 10 times with the same polarity. 6.5.2.1 Line insulation test and line-to-line insulation test Each line (or line combination) shall be tested separately. The line is insulated from other lines of the instrument in normal use. The line terminals that are not subjected to impulse voltage shall be grounded. When the voltage and current lines of the driving element are connected together in normal use, the test shall be carried out on the entire line. The other end of the voltage line shall be grounded, and the impulse voltage shall be applied between the current line terminal and the ground. When several voltage lines of the instrument have a common point, this point shall be grounded, and the impulse voltage shall be applied in turn between each free terminal connected (or the current line connected to it) and the ground. When the voltage and current lines of the same driving element are separated and properly insulated in normal use (for example, each line of the instrument transformer), each line shall be tested separately. When testing the current line, the other line terminals shall be grounded, and the impulse voltage shall be applied between one of the current line terminals and the ground. When testing the voltage line, the other line terminals and one of the tested voltage line terminals shall be grounded, and the impulse voltage shall be applied between the voltage line terminals and the ground. Between other terminals and ground.
Auxiliary circuits directly connected to the line or connected to the same voltage transformer as the instrument circuit and whose reference voltage is above 40V shall be subjected to impulse voltage test according to the conditions specified for the voltage circuit. Other auxiliary circuits are not tested. 6.5.2.2 Insulation test of circuit to ground
All terminals of the instrument circuit, including the terminals of auxiliary circuits with a reference voltage above 40V, shall be connected to each other. Auxiliary circuits with a reference voltage less than or equal to 40V shall be grounded. The impulse voltage shall be applied Between all circuits and ground. 6.5.3 AC voltage test
The AC voltage test shall be carried out in accordance with Table 7.
The test voltage shall be a substantially sinusoidal wave with a frequency of 45 to 65 Hz and applied for 1 min. The power supply shall be able to supply at least 500 V·A. In the chassis test, the non-tested circuits shall be connected to the chassis (item A in Table 7). In the ground test, auxiliary circuits less than or equal to 40 V shall be grounded (item C in Table 7). 150
Test voltage (rms)
2 kV (for a), b), c), d)) tests and 500V (for e) test)
600V or under reference conditions, twice the voltage applied to the voltage winding (if higher than 300V) (the higher value)
4kV (for a) test)
2kV (for b) test)
40V (for d) test)
GB/T 15283-—94
Table 7 AC voltage test
Test voltage application point
A. The terminal cover is removed and the test is carried out at the following two points: The point is between the base frame and the following other point: a) Each current circuit separated from other circuits and properly insulated in normal operation; b) Each voltage circuit or voltage circuit group with a common point separated from other circuits and properly insulated in normal operation; 1)
c) Each auxiliary circuit or circuit group with a common point, and its reference voltage is above 40V; d) In normal operation Each group of current and voltage windings of driving elements that are interconnected but separated from other circuits and properly insulated; 2
e) Each auxiliary circuit with a reference voltage equal to or lower than 40V B. The terminal cover is removed, but the metal cover is in its original position. The voltage is applied between the current circuit and voltage circuit of each driving element. These circuits are usually interconnected. For the purpose of testing, these circuits should be temporarily disconnected 3) C. Cover the case, cover the cover and terminal cover and test in their original positions. All current and voltage circuits and auxiliary circuits with a reference voltage of more than 40V are connected to one point, and the other point is ground D. Additional tests for insulated enclosed Class I protection instruments. a) All current and voltage circuits and auxiliary circuits with a reference voltage of more than 40 V are connected to one point, and the other point is earth;
b) Between the base frame and earth;
c) Visual inspection shall comply with the conditions of 5.6; d) One point is all conductive parts inside the case connected together, and the other point is all conductive parts outside the case that can be touched by the test finger connected together)
Note: 1) The connection between the current and voltage windings is simply disconnected, and its insulation is generally not sufficient to ensure resistance to the 2kV test voltage. Tests a) and b) are applicable to instruments operated by instrument transformers, and also to certain special instruments with separate current and voltage windings. 2) Circuits subjected to tests a) and b) are not subjected to test d). When the voltage circuits of a three-phase instrument have a common point in normal operation, this common point should be reserved for testing. In this case, all circuits of the driving components are tested separately. 3) Strictly speaking, this is not a dielectric strength test, but a method of checking whether the insulation distance is sufficient when the wiring device is open-circuited. 4) If there is no doubt about the test of item c), it is not necessary to do the test of item d) of part D. 7 Instrument marking
7.1 Nameplate
Each instrument shall have the following information:
Manufacturer's name or trademark and manufacturer's address (if required); a.
Type name (see 3.30) and location of approval mark (if necessary); b.
Applicable to the number of phases and wires of the instrument (for example, single-phase two-wire, three-phase three-wire, three-phase four-wire), this mark can be replaced by the graphic symbols shown in Appendix A;
Serial number and year of manufacture. If the serial number is marked on a plate fixed on the cover of the meter, this number should also be marked on the bottom and base of the meter;d
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GB/T 15283-94
e, reference voltage, marked in one of the following forms: a number of components (if more than one), and the voltage at the terminal of the instrument voltage circuit; a nominal voltage of the system or the secondary voltage of the instrument transformer used to connect to the instrument. See Table 8 for marking examples.
Table 8 Voltage Sign
Single-phase two-wire 127V
Single-phase three-wire 127V
(127V to the middle line)
Three-phase three-wire two-element
(Phase-to-phase voltage 220V)
Three-phase four-wire three-element
(220V to the neutral line)
Voltage on the line terminal
2×220V
3X220(330)V
Nominal system voltage
3X220V
3X220/380V
f. For directly connected instruments, examples of basic current and maximum current are: 10-40A or 10 (40) A, which means the basic current of the instrument is 10A and the rated maximum current is 40A; for instruments connected to transformers, the secondary current of the transformer connected to the instrument is expressed as /5A. The basic current and rated maximum current of the instrument can be included in the type name, for example: ABC-1. 5-6 or ABC-1. 5(6);
g. The reference frequency is expressed in Hz; the instrument constant is expressed in W·h/r or αr/kW·h; h. The instrument grade index is expressed by the grade number 0.5 or 1 in the circle or by C1.0.5", "C1.1", (I.2". When there is no mark, the instrument should be regarded as Class 2; j. The reference temperature is not 23℃, which should be marked; k. Insulated enclosed direct protection instruments use the return symbol. The above items a, b and c can be marked on the permanent On a plate fixed to the meter cover. Information from d to k is marked on a nameplate located inside the meter, for example, the nameplate can be fixed to the meter register. This information can also be marked on the meter nameplate. The
marking should be clear, not easily erased, and can be read from the outside of the meter. If the meter is of a special type (for example with a check valve, or when the voltage of the switching magnet of a multi-rate meter is different from the reference voltage), it should be specially marked on the nameplate or on a separate plate. If the meter records electrical energy through an instrument transformer, and When the instrument constants have been considered as transformers, the inductor ratio should be marked. Standard symbols can also be used (see the translation of IEC 387 publication). 7.2 Wiring diagram and terminal markings
Each instrument should be marked with a wiring diagram that cannot be erased. For three-phase instruments, the wiring diagram should indicate the phase sequence of the instrument. With the agreement of both parties, the national standard identification graphic can be used instead of the wiring diagram. If the instrument terminals are marked with a mark, this mark should also be shown on the wiring diagram. 8 Accuracy
8.1 Conduct Accuracy test conditions
The meter cover should be in its original position;
Only the fastest drum of the drum meter rotates; b.
c. Before any test, the voltage circuit should be energized for at least: 152
Standard slow-changing network m
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0.5-level instrument for 4 hours;
-1-level instrument for 2 hours;
2-level instrument for 1 hour.
GB/T 15283-94
The measured current should be adjusted by increasing or decreasing the value gradually, and the current circuit should be maintained at each current value for a sufficient time to achieve thermal stability. Correspondingly, the speed is kept constant;
In addition, for three-phase instruments:
--Should comply with the phase sequence marked in the wiring diagram; -The voltage and current system should be basically symmetrical (see Table 9). Table 9 Voltage and current system symmetry
Three-phase instrument
The difference between the sea-phase voltage (line to neutral line) and the line voltage (line to line) and the corresponding voltage average value does not exceed the difference between each phase current and the average value of each phase current. The phase displacement of each current and the corresponding phase voltage does not take into account the power factor, and the difference between each other does not exceed
Influence quantity
Ambient temperature
Working position
From the outside Reference frequency
Magnetic induction intensity
Reference value
Reference temperature, when unmarked
is 23℃1)
Vertical working position2
Reference voltage
Reference frequency
Sinusoidal voltage and current
Magnetic induction intensity equals zero
Reference conditions
Instrument grade
Allowable deviation of instruments of each grade
±2℃
Distortion factor is less than
Magnetic induction intensity value that causes error change not greater than the following value"0.1%
Note: 1) If the test is not carried out at the reference temperature (including the allowable deviation), the result should be corrected with the appropriate instrument temperature coefficient, 2) Determine the vertical working position (see 5.2). The instrument design and assembly should ensure the correct vertical position (front and back and left and right) under the following conditions. The bottom of the table is supported by vertical walls;4h for level 5 instrument;
-2h for level 1 instrument:
1h for level 2 instrument.
GB/T 15283-94
The measured current should be adjusted by increasing or decreasing value, and the current circuit should be maintained for a sufficient time at each current value to achieve thermal stability. Correspondingly, the speed should be constant;
In addition, for three-phase instruments:
--Should comply with the phase sequence marked in the wiring diagram; -The voltage and current system should be basically symmetrical (see Table 9). Table 9 Voltage and current system symmetryWww.bzxZ.net
Three-phase instrument
The difference between the sea phase voltage (line to neutral line) and the line voltage (line to line) and the corresponding voltage average value does not exceed the drop between each phase current and the average value of each phase current does not exceed the phase displacement of each current and the corresponding phase voltage. Without considering the power factor, the difference between each other does not exceed
Influence quantity
Ambient temperature
Working position
|Magnetic induction intensity from external reference frequency
Reference value
Reference temperature, when unmarked
is 23℃1)
Vertical working position2
Reference voltage
Reference frequency
Sine Voltage and current
Magnetic induction intensity equals zero
Reference conditions
Instrument grade
Allowable deviation of instruments of each grade
±2℃
Distortion factor is less than
Magnetic induction intensity value that causes error change not greater than the following value"0.1%
Note: 1) If the test is not carried out at the reference temperature (including allowable deviation), the result should be corrected with the appropriate instrument temperature coefficient, 2) Determine the vertical working position (see 5.2). The instrument design and assembly should ensure the correct vertical position (front and back and left and right) under the following conditions. The bottom of the meter is supported by a vertical wall;
Indicator special network
Standard tour competition shell4h for level 5 instrument;
-2h for level 1 instrument:
1h for level 2 instrument.
GB/T 15283-94
The measured current should be adjusted by increasing or decreasing value, and the current circuit should be maintained for a sufficient time at each current value to achieve thermal stability. Correspondingly, the speed should be constant;
In addition, for three-phase instruments:
--Should comply with the phase sequence marked in the wiring diagram; -The voltage and current system should be basically symmetrical (see Table 9). Table 9 Voltage and current system symmetry
Three-phase instrument
The difference between the sea phase voltage (line to neutral line) and the line voltage (line to line) and the corresponding voltage average value does not exceed the drop between each phase current and the average value of each phase current does not exceed the phase displacement of each current and the corresponding phase voltage. Without considering the power factor, the difference between each other does not exceed
Influence quantity
Ambient temperature
Working position
|Magnetic induction intensity from external reference frequency
Reference value
Reference temperature, when unmarked
is 23℃1)
Vertical working position2
Reference voltage
Reference frequency
Sine Voltage and current
Magnetic induction intensity equals zero
Reference conditions
Instrument grade
Allowable deviation of instruments of each grade
±2℃
Distortion factor is less than
Magnetic induction intensity value that causes error change not greater than the following value"0.1%
Note: 1) If the test is not carried out at the reference temperature (including allowable deviation), the result should be corrected by the appropriate instrument temperature coefficient, 2) Determine the vertical working position (see 5.2). The instrument design and assembly should ensure the correct vertical position (front and back and left and right) under the following conditions. The bottom of the meter is supported by a vertical wall;
Indicator special network
Standard tour competition shell
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