I. Overview
The STE38-CT 4G three-phase electronic energy meter is a new type of energy meter designed and manufactured using advanced low-power integrated circuit technology and SMT processes, designed to measure three-phase active power in 50/60Hz AC circuits.
This meter can directly and accurately measure total active energy consumption, real-time current, voltage, active power, power factor, and frequency. It also features RS485 communication capabilities for remote meter reading and control, with performance indicators compliant with national standards such as GB/T 17215.321-2008 "Class 1 and Class 2 Static AC Active Energy Meters" and DL/T 645-2007 "Multi-function Meter Communication Protocol." Additionally, it incorporates 4G wireless communication functionality, offering advantages like anti-theft protection and flexible installation locations, making it an ideal product for meter upgrades.
II. Key Functional Features
1. Fully electronic three-phase AC active power bidirectional metering function, with reverse flow included in the total electricity consumption.
2. Equipped with anti-potential drift logic circuit and anti-theft power function.
3. It features 4G data remote viewing and control capabilities, enabling remote modification of server IP ports.
4. RS485 communication interface, supporting MODBUS-RTU protocol
5. Measure the current, voltage, active power, reactive power, power factor, and frequency.
6. Equipped with touch buttons for easy rotation display; click the down-scroll button to view data rotation.
7. Real-time electrical parameters and total power consumption can be viewed, and the prepaid function can be enabled or disabled based on user requirements (prepaid functionality requires customized control features to be implemented).
8. Wide range, low power consumption, compact size, lightweight, aesthetically pleasing appearance, and high reliability.
9. Remote switching function (special customization).
10. Built-in Telecom 4G IoT SIM card with 30MB monthly data allowance
Ⅲ. Working Principle
The 4G-type three-phase meter primarily consists of a voltage and current sampling circuit, a dedicated power measurement chip, a CPU, and an LCD display. The meter inputs the sampled voltage and current signals into the dedicated power measurement chip, outputs power pulse signals, displays the power via the LCD, and remotely records data such as the meter's power consumption through the NB-IOT interface.
| Category |
Parameter / Standard |
Description |
| Model |
STE38-CT |
Three-phase GPRS Smart Prepaid Electricity Meter |
| Electrical Parameters |
3×220V/380V |
Three-phase four-wire system, line voltage 380V, phase voltage 220V |
| 3×5(45)A |
Basic current 5A, maximum current 45A |
| 60Hz |
Operating frequency is 60Hz |
| Class 1.0 |
Accuracy Class 1 (error within ±1.0%) |
| Protection Class |
IP54 |
Dust protection grade 5 (prevents harmful dust accumulation), water protection grade 4 (prevents splashing water intrusion) |
| Pulse Constant |
400 imp/kWh |
400 pulses output per 1kWh of energy consumption |
| 400 imp/kVarh |
400 pulses output per 1kVarh of reactive energy consumption |
| International Standards |
IEC 62052-11 |
General requirements, tests and test conditions for electricity meters (AC) |
| IEC 62053-21 |
Special requirements for AC active energy meters (Class 0.5, Class 1 and Class 2) |
| IEC 62055-41 |
Prepaid Electricity Meter Systems: Part 41 - Electricity Meters (STS Standard) |
| Industry Certification |
STS ASSOCIATION |
Complies with STS (Standard Transfer Specification) prepaid standard |
| Communication Function |
GPRS |
Supports GPRS wireless communication to realize remote data collection and management |
| Function Identification |
Alarm |
Alarm indicator (triggered on abnormality) |
| Credit |
Balance/Credit indicator |
Notice:The accuracy class of electricity meters shall be selected according to their installation locations. Please refer to the parameter table below to choose the appropriate accuracy class for different scenarios. |
Application Scenario |
Recommended Accuracy Class |
Recommended Meter Type |
Core Standard Basis |
Core Advantages |
Cost Reference |
| Power grid user trade settlement (for large industrial and commercial users) |
0.5 Class |
Three-phase High/Low-voltage Smart Meter (with GPRS/PLC Communication) |
IEC 62053-21 (0.5 Class), IEC 62052-11 |
计量精度最高,避免电费纠纷,支持远程抄表
Highest measurement accuracy to avoid power fee disputes; supports remote meter reading |
High |
Trade Settlement between Grid and Large Industrial/Commercial Users |
1 Class |
Three-phase GPRS Smart Prepaid Meter (e.g., STE38-CT) |
IEC 62053-21 (1 Class), IEC 62055-41 (STS Prepaid) |
Balanced accuracy and cost; supports prepaid/remote management, compatible with 60Hz power grid |
Medium |
Total Metering for Internal Industrial/Commercial Users |
1 Class |
Three-phase Smart Meter |
IEC 62053-21 (1 Class) |
Meets the metering requirements of total load in residential quarters; supports remote energy consumption monitoring |
Medium |
General Metering in Residential Quarter Distribution Room |
1 Class |
Three-phase Smart Meter (with Current Transformer Interface) |
IEC 62053-21
IEC 62053-21 (1 Class) |
Accurately monitors equipment energy consumption for operation and maintenance cost accounting |
Medium |
Residential Household Entry Meter |
2 Class |
Single-phase Smart Prepaid Meter |
IEC 62053-21
IEC 62053-21 (2 Class) |
Low cost; meets civil metering requirements, compatible with STS token recharge |
Low |
Sub-meter for Small Shops/Rental Housing |
2 Class |
Single-phase/Three-phase Smart Meter |
IEC 62053-21
IEC 62053-21 (2 Class) |
Flexible deployment, suitable for tenant-based billing, cost-effective |
Low |
Energy Consumption Assessment for Internal Departments/Workshops in Enterprises |
1 Class/2 Class |
Three-phase/Single-phase Smart Meter |
IEC 62053-21
IEC 62053-21 |
1 Class for core departments, 2 Class for auxiliary areas, balancing accuracy and cost |
Medium/Low |
High-voltage Gateway Metering in Substations |
0.5 Class |
Three-phase High-voltage Energy Meter (with CT/PT) |
IEC 62053-21(0.5 级)
IEC 62053-21 (0.5 Class) |
National/grid-level trade settlement; extremely high requirements for accuracy and stability |
High |
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1,Prioritize Accuracy for Trade Settlement: For power fee settlement between the grid and users, or between enterprises, 0.5 Class or 1 Class must be selected to avoid legal/financial disputes due to measurement errors.
2,Prioritize STS Standard for Prepaid Scenarios: For markets such as Africa and Southeast Asia, prioritize prepaid meters complying with IEC 62055-41 (STS) to adapt to local token recharge systems.
3,Grid Frequency Compatibility: The STE38-CT supports 60Hz, which is suitable for power grids in America, some Asian and African countries. This must be clearly specified in the proposal.
4,Matching Communication Methods: GPRS communication is suitable for remote areas, while PLC (Power Line Communication) is ideal for urban dense areas. Selection should be based on network coverage in the project's location.
5,Match Protection Level to Environment: Select IP54 and above for outdoor/industrial scenarios; IP51 is acceptable for indoor civil scenarios to reduce protection costs. |
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