This standard specifies technical elements in electric power industry during the ordering, acceptance and usage of multifunction electrical energy meters and simultaneously normalizes the function set-up.
This standard is applicable to the single-phase and three-phase AC electric energy mounted multifunction electrical energy meters (hereinafter referred to as electrical energy meters) with the metering reference frequency of 50Hz (or 60Hz).
This standard only specified the functions and technical performance that the electrical energy meters must be possessed of and must be achieved; and technical requirements for the multi-rate electrical energy meters may refer to relevant contents in this standard.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending error in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 9092-1998 Time Switch for Tariff and Load Control (idt IEC 62054-21: 2004)
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 (idt IEC 62052-11:2003)
GB/T 17882-1999 Alternating Current Static Var-hour Meters for Reactive Energy (Classes 2 and 3) (eqv IEC 61268: 1995)
DL/T 566 Technical Requirements for Loss-of-voltage Timers
DL/T 645 Multi-function Watt-hour Meter Communication Protocol
DL/T 830-2002 Technical Requirements for Stoking Single Phase Alternating Current Static Watt-hour Meter
JB/T 6214-1992 Guide of Instrument's Reliability Verification Test and Measurement Test (Exponential Distribution)
IEC 62053-21: 2003 Electricity Metering Equipment (A.C.) - Particular Requirements - Part 21: Static Meters for Active Energy (Class 1 and 2)
IEC 62053-22: 2003 Electricity Metering Equipment (A.C.) - Particular Requirements - Part 22: Static Meters for Active Energy (Class 0.2S and 0.5S)
IEC 62053-23: 2003 Electricity Metering Equipment (A.C.) C Particular requirements C Part 23: Static Meters for Reactive Energy
3 Terms and Definitions
For the purpose of this standard, the terms and definitions established in GB/T 9092-1998 and the following ones apply.
3.1
Multifunction electrical energy meter
It refers to electrical energy meters composed of metering unit and data processing unit and which has more than two functions such as time division and measuring demand besides metering active and reactive energy and are able to display, store and output data.
3.2
Loss of voltage
In the three-phase (or single-phase) power supply system, where the load current of some phase is larger than the starting current but the voltage of the voltage line is less than 78% of the normal operating voltage of the electric energy meter for more than 1min; such operating condition is referred to as loss of voltage.
3.3
Critical voltage
Electric energy meters are able to start the minimum operating voltage and this value is 60% of the lower limit of reference voltage.
3.4
No-voltage
If voltages of three phases (single-phase meter with single-phase voltage) are all less than the critical voltage of electric energy meters and the load current is larger than the 5% rated (basic) current; such operating condition is referred to as no-voltage.
3.5
Loss of phase
It refers to the state that the voltage of some phase is less than the critical voltage of electric energy meters and the load current is less than the starting current in three-phase power supply system.
3.6
Loss of current
It refers to the state that the three-phase voltage is larger than the critical voltage of electric energy meters, any phase or two phases in three-phase current is less than the starting current and the load current of other phase lines is larger than 5% rated (basic) current.
3.7
Demand
It refers to the average power within the specified time.
3.8
Demand interval
It refers to the time interval to measure the continuous equality of the average power.
3.9
Maximum demand
It refers to the maximum value of the demand recorded within the specified time period.
3.10
Sliding window time
It refers to the time interval which is less than the demand interval to measure the maximum demand by recurrence in turn.
3.11
Freeze
It refers to the operation to store important data at specific moment.
3.12
Time consumption and rates
Several time periods that 24h in one day are divided into are referred to as time consumption, generally apex, peak, flat and valley time consumption.
The corresponding price system with the time consumption of power supply consumption for electricity charge calculation is referred to as rate.
3.13
Harmonic content
It refers to the component except the fundamental component in the periodic alternating current component.
3.14
Harmonic energy
It refers to the sum of the electric energy except the electric energy of the fundamental wave in the periodic alternating current component.
3.15
Power orientation
It is determined according to the definition in Appendix E of GB/T 17882-1999.
4 Classification and Configuration of Electrical Energy Meters
4.1 Classification according to accuracy class
Electrical energy meters may be divided to 0.2S, 0.5S, 1 and 2 according to accuracy class.
4.2 Classification according to function
Electrical energy meters may be divided into gate electrical energy meters, high-voltage electrical energy meters and low-voltage electrical energy meters.
4.2.1 Gate electrical energy meters
Gate electrical energy meters are used for key clients of inter-regional interconnecting ties load-center substation, network power plants, interconnecting ties substation between provinces, gates between provinces, regions and cities as well as those with self-contained power supply and signing with network agreement. Such users are characteristic of active forward and reverse, reactive four-quadrant, large power flow variation, wide load dynamic range, high information acquisition frequency, large data transmission volume as well as multi-rate time-sharing metering and power factor assessment function.
