Sensor type high voltage energy meter

Working Principle

Sensor-type high-voltage energy meter is actually a direct measurement of high-voltage energy, the use of a variety of weak output current, voltage, non-traditional high-voltage sensors, instead of the traditional electromagnetic current, voltage transformers, as a high-voltage current, voltage conversion equipment, directly into a matching signal required by the measurement chip, conversion equipment and power measurement module for the design of a unified, integrated to achieve high-voltage energy measurement. The schematic diagram is shown in the figure below. The schematic diagram is shown below：

Sensor type high voltage energy meter working principle block diagram

Model number and numbering method

Product Use

Sensor-type high-voltage power meter as a high-voltage power data terminal, used to realize high-voltage electrical energy metering, measurement, control, provide electrical energy, voltage, current, power, power factor and other related power, can completely replace the traditional measurement device of transformer + meter to achieve its original function, is a smart grid construction AMI advanced measurement system of priority products.

Structural characteristics and external dimensions

Power measurement unit and the sensor for electromechanical integration of the unified design, changing the traditional measurement of the link, the sensor's standard current signal, standard voltage signal, according to the measurement module input requirements, directly processed into a directly connected to the signal, reducing the standard voltage, standard current signal multiple conversions, reducing the output capacity, the elimination of the standard current signal interface of the power meter manganese-copper shunt resistor. The output port of the sensor is reasonably matched with the input port of the power metering module, i.e., it can realize metering in the high-voltage side, and transmit the data back to the display unit through RS485 wired, far-infrared, wireless telecommunication, GPRS, fiber optic, etc., and it can also use the sensor to transmit the current and voltage signals of the high-voltage side back to the low-voltage side with the weak signals of milliamperes and millivolts, and the high-voltage measured wires adopt the following methods in order to improve the performance of the prevention of power theft In order to improve the performance of anti-electricity theft, the high-voltage conductor to be measured is used to penetrate the non-contact type or penetrate the single-point connection, which improves many disadvantages of the traditional metering method and shows the characteristics of easy to install and use, safe and reliable, maintenance-free, anti-electricity theft, material-saving and energy-saving.

Advantages compared with traditional metering devices

In addition to completely replacing the functions of the traditional metering device of transformer + meter, the sensor-type high-voltage energy meter also has the following obvious advantages.

Safe and reliable, reducing the chance of grid failure.

● High-voltage inlet end shows several tens of megabits of resistive impedance, not inductive, by ferromagnetic resonance, high harmonics, operation overvoltage, lightning surge voltage and other factors greatly reduced;.

● Phase-to-phase can withstand 28kV frequency withstand voltage, greatly improving the voltage factor, enhance the level of insulation, reduce the grid user unterminated due to transformer no-load capacitance uplift phenomenon, resulting in voltage rise and affect the PT phenomenon;

● Canceled the primary side of the multiple current nodes, no hot spots.

● Eliminate the connection point between the transformer and the energy meter 5A\100V, as well as the current circuit of the energy meter inside the transformer or manganese-copper shunt resistor, there is no “burn meter” phenomenon, simplifying the voltage circuit inside the energy meter.

● Sensor of the secondary circuit open circuit, short circuit and low voltage side of the various faults will not appear to expand the grid accident phenomenon.

In short, the above measures can greatly reduce the failure rate of power metering devices in the power grid, improve the safe operation of the grid coefficient, improve the quality of power supply, reduce operation and maintenance costs.

Point by point, to eliminate power theft, no need to add other anti-power theft measures

● One of the main factors in the design of sensor-type high-voltage power meter is to prevent power theft, using all the original measurement-related fully enclosed, the primary conductor through the type of non-contact or through the type of single-contact on the lead seal, dry maintenance-free structure, the amount of power read directly and counted directly in the high-voltage side of the formation of the amount of power, through the RS485 output interface, fiber optic, wireless, GPRS back to the low-voltage side, can be a direct replacement for the traditional It can directly replace the traditional metering device. There is no wrong ratio, miscalculation and other phenomena, but also effectively prevent the occurrence of power theft phenomenon of strong magnetic field interference, do not need to add another anti-power theft measures.

Thru-feed contactless	Through-the-wall single contact type
No need to cut off the line, reduce the hot spot, reduce the incidence of accidents, suitable for large and small current wiring.	Easy to connect, suitable for small current wiring.

Energy saving and material saving effect is obvious, easy to install and use

● The total annual power consumption of each metering point is less than 8w, which is only equivalent to the power consumption of an ordinary meter, and saves the power consumption of multiple transformers and secondary impedance. Saving about 1730kwh of electricity, the annual cost of its own energy consumption to save more than 1,000 yuan

● Advanced electronic technology replaces resourceful materials, greatly reducing the amount of silicon steel sheet, copper, steel, transformer oil or epoxy resin, saving a lot of resourceful materials.

● Sensor-type high-voltage energy meter adopts the fully enclosed, penetrating non-contact or penetrating single contact on the seal, dry maintenance-free structure, small size, light weight, node less power direct reading, easy to install and use, RS485 output interface, can directly replace the traditional measurement device. There is no wrong ratio, miscalculation and other phenomena. With two wiring methods and a variety of installation methods, installation is more convenient.

Precise measurement and the error is uniquely determined

Due to the high-voltage current, voltage conversion equipment and power measurement module unified design, the interface between each other reasonable matching , reduce the error, the overall measurement, the sensor error can be adjusted through the metering chip error software to improve the metering accuracy, from the start-up current to the five letters of the rated current range of the error curve is almost a straight line, to reduce the phenomenon of low load, overloading leakage of power counting phenomenon, the overall accuracy is divided into 0.2 level, 0.2s level, 0.5 level, 0.5s level, 1 level, 1s level, 1.5 level, 1.5s level, 2 level, which is much higher than the traditional level:The error measurement adopts the overall calibration, which includes the error caused by the transformer, meter and conductor impedance, and there is no uncertainty error caused by the subsequent installation.

Product Classification

Basic CGDS-12J

It is used for fixed transformer end-users to record and display electric energy, current, voltage, active power, reactive power and power factor for general metering.

The prepaid CGDS-12Y has the following features in addition to the basic model:

● IC electric card automatically reads back the electricity consumption data of the meter. Simplify the process of meter reading and protect the interests of both power supply and consumption.

● In case of power failure, the data in the meter is automatically protected and reliably saved.

● Alarm function: When the remaining power in the meter is equal to or less than the alarm power, it will be pre-alarmed. When the remaining power in the meter is equal to zero, the power supply will be stopped.

● The meter has the function of recording negative electricity quantity.

The compound rate type CGDS-12F has the following functions in addition to the basic type:

● Multiple annual time zones and daily time period table numbers.

● A maximum of 12 time slots can be set for each daily time table.

● 4 different rates can be set for each day.

● Public holiday date and daytime table number.

The multifunction model CGDS-12D has the following functions in addition to the basic model:

● Active maximum demand and its occurrence time.

● Multiple annual time zones and daily time period table numbers.

● A maximum of 12 time periods can be set for each daily time table.

● 4 different rates can be set for each day.

● Monthly timed automatic meter reading, save 12 months of monthly power freeze data.

● Loss of voltage, loss of current, phase failure recording function.

● Outage time and power-on time recording function.

● Programming record.

● Demand zero clearing record.

● Load curve record.

● Meter operation fault alarm function.

● With the date of public holiday and the day period meter number.

Intelligent CGDS-12Z has the following functions in addition to the basic model.

● According to the user requirements to meet the user to have the function.

In short, the sensor-type high-voltage power meter can meet the requirements of traditional metering devices, and can simplify the line.

Main technical indicators

● Executive standard: Q/0300SJD 001-2011 “Sensor-type high-voltage energy meter”.

● Certification Regulations: JJG(LU)89-2010 “Certification Regulations for High Voltage Energy Meter”.

● Reference to the implementation of standards: GB311.1-1997 “high-voltage equipment insulation with”.

● Accuracy level: 0.2 level, 0.2s level, 0.5 level, 0.5s level, 1 level, 1s level, 1.5 level, 1.5s level, 2 level; rated current: basic 20A, 30A, 50A, 75A, 100A and their ten times multiplier.

● Wide load type 20(100)A, 100(500)A, 400(1000)A.

● Rated frequency: 50Hz.

● Insulation level: 12kV/42kV/75kV.

● Ambient Temperature:(-25℃~55℃).

● Storage and working humidity:<95%.

● Communication interface:RS485 port.

● Communication Statute: “DL/T645-1997, DL/T645-2007 Multi-function Power Meter Communication Statute.

Display and meter reading

● The display can be wired and wireless through RS485 port, and it is a real-time data display of various parameters of electric energy.

● It can be equipped with a palm reader computer, which can be used to read meters wirelessly.

● Wireless communication equipment through GPRS for meter reading.

● It can be equipped with different display modes, such as fiber optic, carrier wave, etc., according to the specific requirements of users.

Transportation and Storage

● Under the state of packaging, the basic environmental conditions for transportation and storage of the products shall be implemented according to the provisions of Article 5.2 of GB/T15464 standard.

● In the unpackaged state, the product should be stored indoors in a dry place, and there should be no harmful gases and other harmful media causing corrosion in the air.

Quality Assurance

● The energy meter within 12 months from the date of shipment, the user to comply with the requirements set out in the “Instructions for Use”, and the product appearance under the conditions of integrity.

● If the energy meter does not meet the requirements set forth in the technical conditions, the implementation of three packages.

Low-voltage Power Users Electricity Information Collection System

● AMR function:real-time meter reading, automatic timed meter reading, synchronized meter reading, 100% success rate of one meter reading.

● Negative control management: manual remote control, automatic remote control, dynamic indicator load control.

● Power consumption management: real-time line loss measurement, real-time power consumption analysis, ladder tariff, time-of-day pricing, dynamic price change.

● Electricity management: prepayment, postpayment, real-time electricity statistics, real-time query.

● Interactive functions: SMS platform, SMS reminder, SMS electricity information query; Internet interactive platform.

● Grid quality detection: real-time voltage detection, three-phase balance real-time detection, harmonic detection.

● Alarm management: abnormal power consumption alarm, abnormal communication network alarm.

High-voltage power users' electricity consumption information monitoring system

● AMR function: real-time meter reading, automatic timed meter reading, synchronized meter reading.

● Grid quality detection: real-time high-voltage voltage detection, real-time three-phase balance detection, high-voltage harmonic detection.

● Power consumption management: real-time line loss measurement, real-time power consumption analysis, ladder tariff, time-of-day pricing, dynamic price change.

● Interactive functions: SMS platform, SMS reminder, SMS electricity information query; Internet interactive platform.

● Alarm management: abnormal power consumption alarm, abnormal communication network alarm.