1.0.1 This Code is formulated with a view to implementing the national technical and economic policies in the electrical measuring and energy metering device design process, so as to achieve the accuracy and reliability, state-of-art technology and economic feasibility.
1.0.2 This Code is applicable to the design of electrical measuring and energy metering devices of newly-built or extended steam turbine generator and gas turbine plant with unit capacity of 25MW or above, hydraulic power plant (including pumped-storage power generation plant) with unit capacity of 200kW or above, conventional island of nuclear power station, substation (distribution station) with nominal AC voltage of 10kV or above, DC converter station with nominal DC voltage of 100kV or above.
1.0.3 The electrical measuring and energy metering device shall be designed in accordance with those specified in this Code, and relevant national current standards and codes.
2 Terminologies and Symbols
2.1 Terminologies
2.1.1 Electrical measuring
The measuring for electrical real-time parameters by electricity.
2.1.2 Energy metering
The metering for energy parameters.
2.1.3 General electrical measuring meter
The meters for frequent measuring, selective measuring and record of electrical operation parameters of power system circuit.
2.1.4 Pointer-type meter
The meter which indicates the measured value based on the relationship between pointer and scale.
2.1.5 Digital-type meter
The meter which directly displays the measured value on the display with digit.
2.1.6 Energy meter
The meter which meters active (reactive) energy data.
2.1.7 Impulse enerny meter
The combination of energy measuring component and pulser.
2.1.8 Multifunction energy meter
The energy meter which consists of measuring unit and data processing unit, meters demand by time and direction (including one-way or two-way active (reactive) energy), and can also display, store and output data.
2.1.9 Voltage loss time counter
The special instrument which accumulates and displays loss time of the voltage circuit of an energy meter.
2.1.10 Energy tariff point
The metering point for energy settlement between power generation enterprises and power grid enterprises.
2.1.11 Electrical measuring transducers
The device which converts the measured value to DC current, DC voltage or digital signal.
2.1.12 Calibration value for transducers
The value obtained by changing the nominal value of the transmitter through adjustment according to the user's specific demand.
2.1.13 Measuring instrument accuracy class