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China Suppliers Factory SXDF-0.4 Low-Voltage Prepaid Energy Metering Control Equipment for 0.4kV Systems
Citations
◇ GB/T16934-1997 "Prepaid Energy Metering Cabinet"
◇ GB14048.2-94 "Low-Voltage Switchgear and Controlgear - Low-Voltage Circuit Breakers" GB1208-1997 "Current Transformers"
◇ GB1207-1997 "Voltage Transformers"
◇ Q/GDW129-2005 "General Technical Conditions for Power Load Management Systems" Q/GDW130-2005 "Data Transmission Protocol for Power Load Management Systems"
◇ DL/T645-1997 "Communication Protocol for Multifunction Energy Meters" DL/T614-1997 "Multifunction Energy Meter"
Application Environment
Ambient Temperature
-5℃ to +50℃, with an average temperature not exceeding +35℃ within 24 hours.
Relative Humidity
Not exceeding 90% at +20℃; not exceeding 50% at +40℃.
Altitude
Below 2000m.
Inclination
No more than 3° for the cabinet (box) shell; no more than 1° for the energy meter.
Performance Indexes
- Nominal Voltage: 0.38KV;
- Rated Frequency: 50Hz;
- Rated Current: 40A, 60A, 80A, 100A, 160A, 250A, 400A, 630A, 800A, 1000A, 1500A, 4000A, etc.;
- Protection Level: Ip540;
- Installation Method: Two installation environments: outdoor and indoor. In an indoor environment, the cabinet type is fixed to the ground, while the box type is wall-mounted or embedded in the wall. In an outdoor environment, the cabinet type is installed on the transformer, mounted on the low-voltage bushing of the transformer, with anti-theft electricity functions.
- Current Transformer: 0.2S grade;
- Meter Position Setting: For low-voltage metering of public transformers and dedicated transformers, the three-phase prepaid box is set with two meter positions for installing energy meters and prepaid control Equipment;
- Circuit Breaker: Plastic case circuit breakers for 630A and below, and universal circuit breakers for 800A and above.
Performance Parameters
- Remote Meter Reading: Can be done using a fixed computer or through mobile phones to read data from external energy meters anytime and anywhere, facilitating the detection of electricity theft and saving the monthly costs of sending personnel and vehicles for meter reading.
- Prepaid Management: Management personnel can directly input the electricity amount on-site into the GSM/GPRS-PK system using a computer or mobile phone based on the prepaid electricity bill or bank transfer slip. This allows for the accumulation of the remaining electricity balance and management of electricity usage, enabling centralized management via computer and individual management by regional electricity management personnel using their mobile phones.
- Management Method: When the prepaid electricity balance reaches 20%, 10%, and 5%, users will be notified to pay their electricity bills. When the balance reaches 0, a power outage signal is triggered, and the switch is opened to cut off power. After payment, management personnel send a message to the GSM/GPRS-PK system, automatically restoring power supply.
- Effective prevention of electricity theft (box opening alarm).
- Remote control for power disconnection and reconnection.
- Theft prevention (phase loss alarm, power outage alarm, power restoration alarm).
Secondary Circuit
- Measurement Circuit: The energy meter is connected to a dedicated secondary winding. The measurement circuit first passes through a special test junction box before connecting to the energy meter and prepaid control Equipment.
- The cross-sectional area of the current circuit wires in the metering unit is 4mm², while the cross-sectional area of the voltage circuit wires in the metering unit is 2.5mm² . The cross-sectional area of control, signal, and other wires is 1.5mm².
- The internal secondary circuit wires of the box utilize single-core, single-strand copper insulated wires with a nominal voltage of not less than 500V.
- Inside the box, there are power indicator lights, alarm indicator lights, closure indicator lights, and disconnection indicator lights. Indicator light colors: closure is red, disconnection is green. The energy metering control cabinet provides maintenance operation phases, equipped with manual disconnection and closure buttons. The manual disconnection and closure buttons are protected with a door lock. The cabinet door is spray-painted with the State Grid Corporation logo and service hotline number, along with a " Electrical Hazard " warning sign.
- The cabinet body is made of matte stainless steel plate, with a thickness of 1.5mm for capacities of 400A and below, and a thickness of 2.0mm for capacities of 630A and above ( made from cold-rolled steel plate), which undergoes good anti -rust, spray coating, and corrosion treatment. All Equipment and metal fasteners inside the cabinet are resistant to rust and oxidation. The observation window for reading the meter uses 4mm colorless transparent polycarbonate material, with an area that meets the requirements for reading and monitoring .
- The cabinet adopts a closed structure, providing good measurement safety and anti-theft functions. During installation, it is only necessary to connect the power incoming line, power outgoing line, and grounding wire; the entire system has no exposed electrical contacts. The top of the control cabinet has ventilation louver holes, while the sides have double-layered ventilation louver holes with opposing opening directions and filters.
- The cabinet door is equipped with a three-point locking system and can be fitted with a lead seal according to user needs. The prepaid control Equipment, metering transformer, energy meter, and special test junction box all have lead seal Equipment at their respective electrical connections. A mechanical pin tumbler lock can be installed on the door of the energy metering control cabinet, equipped with a rain cover for the lock. The locking mechanism uses waterproof locks.
- Busbars are made of copper material, and the cross-sectional size is determined based on 3A of current per square millimeter. For rated currents of 225A and above, copper bars are used, protected with heat-shrink tubing.
Overview of Pre-paid Control Equipment
◇ The GSM/GPRS-PK series remote control terminal for anti-theft and prepaid metering is utilized.
◇ It uses the GSM/GPRS network to achieve functions such as anti-theft metering, prepaid electricity, and remote control for stopping and supplying electricity.
Main Technical Specifications
| NO. | Items | Unit | Parameters |
|---|---|---|---|
| 1 | Power | V | 220/380V or 100V±20% 50Hz |
| 2 | Maximum Power | VA | <3VA |
| 3 | Adaptive Temperature | ℃ | -45°C~85°C |
| 4 | Relative Humidity | % | 30%~95% |
| 5 | Phase-default Alarm Condition | Loss of voltage in any one phase or two phases of a three-phase system. | |
| 6 | Powercut Alarm Condition | Loss of voltage in all three phases | |
| 7 | Electricity Anti-stealing Condition | Illegal opening of the metering box door | |
| 8 | Power-on Alarm Condition | Simultaneous power supply to all three phases |
Frequently Asked Questions
What standard specifications does this Prepaid Energy Metering Cabinet comply with?
The cabinet complies with several key standards, including GB/T16934-1997 for Prepaid Energy Metering Cabinets, GB14048.2-94 for Low-Voltage Circuit Breakers, GB1208-1997 for Current Transformers, and DL/T645-1997 for multifunction energy meter communication protocols.
What are the environmental limits for installing the metering cabinet?
It is suitable for ambient temperatures from -5℃ to +50℃ (average 24h temp ≤ +35℃), relative humidity up to 90% (at +20℃), and altitudes below 2000m. The allowed installation inclination is up to 3° for the cabinet shell and 1° for the energy meter.
How does the prepaid management system notify users about low balance?
The management system triggers notifications when the prepaid electricity balance reaches 20%, 10%, and 5%. If the balance reaches 0, it automatically triggers a power outage signal to open the switch and cut off power until payment is made.
What features prevent electricity theft and unauthorized cabinet opening?
The cabinet employs a closed structure with no exposed contacts, a three-point locking system with lead seals, and a box opening alarm. It also triggers alarms for phase loss, power outages, and illegal access via the GSM/GPRS-PK system.
What materials and thickness are used for the cabinet construction?
The cabinet is made of matte stainless steel or cold-rolled steel plate with anti-rust and spray coating. The thickness is 1.5mm for capacities of 400A and below, and 2.0mm for capacities of 630A and above.
How does the remote control and meter reading terminal operate?
It utilizes the GSM/GPRS-PK series remote control terminal over the GSM/GPRS network. This allows managers to perform remote meter readings, manage prepaid balances, and remotely connect or disconnect the power supply.