I . Summarization:

Power Load Management Terminal is a basic information collection, processing and real-time monitoring system based on computer application technology, modern communications technology, electric power automation technology. Power Load Management Termainl combines the functions of both electricity load management and on-site customer service, featuring for its advanced technology, perfect functions and flexible expansion, so it’s a new generation of remote monitoring device who can help electricity power supply companies to monitor the power consumptin situation and improve the level of demand management.

Power Load Management Termainl adopts ARM9 high-performance enhanced 32-bit CPU. As a intelligent information collection and implementation terminal in the load control and management system, it’s widely used in substations, large users and distribution substation. It can control user’s load by the commands of power load management master station which are communicated through the public network GPRS / CDMA or other communication means. It can initiatively or summoning report the important information of the power parameters, the results of the implementation of load control, terminal operation and alarm information. It can support a milti-protocol power data collection. It can also be operated simply and intuitively due to its dot-matrix LCD display and menu operation.

II . Basic functions and characteristic:

1. It can Fully comply with the Terminal requirements in State Grid issued “Power Load Management System Functions Regulation” and “Power Load Management System General Technical Conditions”, and “Power Load Management System Data Communication Protocol -2005”. It can also support DL/T645-1997 “Multi-functional Watt-hour Meter Communication Protocol” and other varieties of domestic and international metering communication protocol.

2. It adopts ARM9 high-performance enhanced 32-bit CPU which can provide strong real-time processing capability, along with uninterrupted high-performance CPU monitor chips, so it can work stably and reliably without data losing even though power is interrupted. It adopts page management techniques and large-capacity FLASHROM to have high-volume data storage.

3. Flexible communication means: With more independent Serial Bus, it can easily add more multi-function modules so as to have better expansion. It can flexibly and optionally choice communication module (plug-in unit) according to different communication conditions to support different wireless communication means of GSM, GPRS or CDMA to the advantage of fast speed, low working current and high interference immunity, so it can ensure the high data transmission reliability.

4. It has fine EMC performance to withstand the interference of high voltage peak pulse, strong magnetic field, strong static electricity and lightning surge. And it also has a wide self-adaptive temperature range. All circuit modules adopt software and hardware circuits, watchdog circuit and reset circuit to ensure its reliable operation and easy maintenance.

5. It is powered by three-phase power supply to ensure its regular operation even in case of lose phase.

6. It adopts a high-accuracy uninterrupted-power real-time clock module.

7. It has a closed-loop control functions to remotely or locally set up the fixed value of consumption and power along with the control mode.

8. With powerful resistance state functions to remotely or locally modify the equipment parameters and support online updating.

9. It adopts advanced high-speed high-accuracy digital sampling technology to ensure the real-time high-speed consumption metering and calculation, even in the eperation condition of great load fluctuations and high harmonic.

10. It has very high interference immunity due to its photoelectric isolation for the pulse volume, the input and control of remote volume, alarm output.

11. It can read meter data directly by communication port (RS485 port or infrared) or through a special meter reading module, supporting two or more communication protocols. It can also communicate with other varieties of sub-meter.

12. It has a strong self-test function.

13. It can be easily installed due to its enclosed and wall-mounted construction, PVC waterproof flame-resistant meterial and small volume.

14. It can meet the requirement of low-voltage detaction in the future due to its abundant hardware and software expansions functions.

15. It can realize power fixed value closed-loop controls for period control, day-off control, business break control and current threshold control.

16. It can realize consumption fixed value closed-loop controls for consumption control, prepaid consumption control, prepayment control and prepayment threshold alarm.