The DDNSGZ student apartment electric energy meter adopts the national standard design specifications for electric energy meters and is a specialized product developed for safe electricity use in the apartment. It uses a dedicated multifunctional metering chip for electric energy meters and a 32-bit microcontroller for data processing, which can achieve electricity management functions such as metering, identification, control, and charging. It can be widely used for electricity management in school student apartments.
JHISEA2000S student apartment electricity management software system can realize the modern electricity management of the school, and can provide a variety of student payment and query means, such as mobile payment (such as Alipay, WeChat payment, etc.), campus card payment.
The rail type electric energy meter has higher recognition accuracy and speed. The rail type installation method is more suitable for various on-site environments and can be used for new school installation and old school renovation.

Main technical parameters
1. Accuracy: Level 1.0.
Voltage: AC 3 × 220/380V.
3 Current: 1.5 (6) A 5 (20) A 10 (40) A 15 (60) A 20 (80) A
4 Power consumption: Voltage circuit<2W/10VA, current circuit 4VA
5 Working temperature:- 25~55℃
6 Extreme working temperature:- 40~70℃
7 Relative humidity:< 85%.
8 Voltage Range: Normal Operating Voltage: 0.9Un-1.1Un
Maximum operating voltage: 0.8Un-1.15Un
Reference frequency: 50Hz/60Hz
10. Starting current: 20mA
11 Clock error:< 0.5S/day
12 Communication protocol: DL645-1997 or MODBUS-RTU TCP/IP
13 Execution standards: GB/T18460-2001 GB/T17215.321-2008
14 Installation method; Installation using 35mm standard guide rail
15 Dimensions: 72mm × 90mm × 84mm and 125mm × 90mm × 84mm
16 Shell: Made of national standard flame-retardant materials that meet safety requirements.

major function
1. Electricity metering: It can measure both active and reactive energy, with reverse metering and forward accumulation.
2. Electrical parameter measurement: can measure parameters such as voltage, current, power factor, frequency, etc., and can be uploaded.
3. Display: Six digit LED or segmented LCD display, displaying time, voltage, current, power,
Accumulated power and remaining power.
4. Prepaid function: It can realize payment before electricity usage, and data can be accessed through IC card or RS485.
5. Free basic electricity setting: Set according to the school's requirements. If there is an excess of basic electricity in the existing purchased electricity account after setting, it will be added to the purchased electricity, just like paying for electricity. Support setting the amount of electricity that students do not need to pay usage fees for during designated time periods (such as monthly). When students use it, they first consume the free basic electricity, and then consume the electricity purchased by the students.
6. Refund management function, when students graduate, the system can print a refund details table for the parts that need to be refunded.
7. The data exchange function can exchange the remaining power of the room.
8. Data statistical analysis, with the function of electricity data statistics and analysis, and automatically generating reports for querying or printing.
9. Data management function: It can track and audit system operation logs and account operation logs; It can record, save, query, count, and print data related to stored electricity, violations, and settings; Automatically generate reports to provide students with timely electricity balance queries.
10. The reminder function allows for online inquiry, voice or SMS notifications, and mobile payment.
11. Permission management function: Various operations on the account can be performed in batches or individually, and managers can set different operation permissions for operators.
12. Power off function for overdue payments. Low battery alarm function can be set. When the remaining battery level is lower than the alarm battery level, the display screen will flash. When the remaining battery level is less than zero degrees, the power will be cut off and the switch will be opened.
13. Overload protection function. When the voltage or current exceeds the rated value of the meter, the power supply will be automatically cut off.
14. Total power limit protection: Set maximum power consumption protection for each room; At the same time, the protection has daytime mode, air conditioning mode, and nighttime mode; After turning off the lights at night, when only the bathroom is illuminated, the total power protection of the room will be automatically adjusted to the set value (such as 50W) to prevent unauthorized use of electricity from the bathroom at night.
15. Communication function: It has infrared and 2-channel RS485 communication function (standard 1-channel RS485).
16. Emergency power transmission function: When the communication network fails, an infrared meter reader is used for emergency power transmission, and management personnel can transmit power without touching the electricity meter.
17. Malignant load identification function: socket malignant load power protection, can set active incremental power value and power factor value. If the set value is exceeded, the switch will flash and an alarm will be displayed until the violation is resolved and normal operation is restored. It does not affect the use of air conditioning circuits and has the function of identifying malignant loads. It is prohibited to use high-power resistive loads such as electric stoves, fast heating stoves, induction cookers, microwave ovens, hair dryers, etc. that are prone to contact fires.
18. Violation of Electricity Switching Configuration: When a student's unauthorized electricity usage is identified, the device automatically trips and cuts off power. The software system can autonomously set the number of times the unauthorized electricity usage is automatically switched on. If the set number of times is exceeded, the system cannot automatically restore power. After finding out the cause of the power outage with the administrator, the power management personnel will manually restore power through a handheld computer to prevent the occurrence of student violations.
19. Multi channel output: Control the output to correspond to the lighting circuit, socket circuit, air conditioning circuit, and bathroom circuit in the control room, achieving branch power management. Turn off the circuit of the air conditioning circuit during seasons when air conditioning is not needed, and normally turn off the lighting and socket circuits every night. Keep the air conditioning circuit after turning off the lights at night during the season of using air conditioning, and keep the bathroom lights after turning off the lights at night. Stop the power supply of the socket circuit when the illegal use of electricity is not dealt with at the same time.
20. Holiday management function: To meet the centralized and unified management needs of student dormitories during holidays, it supports remote cost control system holiday period configuration. According to the school holiday plan, the electricity consumption of the original dormitories will be frozen and sealed during the designated holiday period. The electricity consumption of the original dormitories will be frozen and sealed during the holiday period, and the electricity consumption during the holiday period will be separately recorded and managed to facilitate centralized management of dormitory electricity management, safety electricity consumption, and control management during the holiday. After the holiday, restore the original sealed electricity consumption according to the school's requirements. The electricity consumption during the holiday period and the original useful electricity consumption need to be independent of each other and not interfere with each other.
21. Multiple rate function (optional) and tiered electricity pricing function (optional): using an independent hardware clock chip. Four types of rates can be implemented, including peak, flat, and valley rates, with multiple time periods for each rate.
22. Temperature detection, there is a temperature detection circuit inside the meter to prevent overcurrent and overheating from causing fires.
23. Lightning protection function, built-in lightning protection circuit.
24. Multiple payment functions: Students can make payments online or through their mobile phones. Pay Alipay, WeChat and other payment methods.
25. Multiple query methods: Students may conduct queries online or on their mobile phones, or through touch screens.
Model selection table:

For example, 1: DDNSGZ1-11 is a combination of one measurement and one identification control
2: DDNSGZ3-34 is a 3-channel metering+4-channel identification control system
3: Like a room with one lighting, one socket, one bathroom, and one air conditioner.
DDNSGZ1-24 two-way metering (separate metering for air conditioning, one metering for the other three) and four-way control can be selected.
4: DDNSGZ2 is a LCD display with the same functions as before.

System Description:
It can be networked to achieve remote centralized computer control of electricity metering and billing in student dormitories, and is compatible with the school's energy-saving supervision platform. The system software should adopt BS architecture, and users can perform data queries, analysis, and management operations on any networked computer with authorization. The database uses SQL Server 2008, and the software JIHSEA2000S uses Microsoft Applications developed using. NET and Visual Studio.
The hardware terminal meets the communication protocol requirements of the "Technical Guidelines for the Construction of Energy Efficiency Supervision Systems for Campus Buildings in Higher Education Institutions": DL/T 645-1997 "Multi functional Meter Communication Protocol". The system must have interface protocols and transmission formats that comply with the Ministry of Construction and the Ministry of Education, and can upload energy consumption data to the provincial energy consumption monitoring platform and the Ministry of Education (Ministry of Construction) platform at any time, supporting multi center transmission.
The system diagram is as follows