1 Overview
MSD900 transformer intelligent management terminal is an automatic terminal equipment for real-time data acquisition and control of transformers. It can collect various data such as current, voltage and temperature of power transformers, record the accumulated running time of transformers, and realize the evaluation of transformer fault life and give diagnostic schemes through intelligent research and judgment of work rise, load rate and failure rate. Through the communication network, the transformer can be connected with the SCADA system of the distribution network, and various data of the transformer can be reported, so that the power station management personnel can timely and accurately grasp the operation status of the transformer, and provide scientific basis for the power supply department to understand the operation status of the distribution network, carry out line loss analysis and load prediction, improve the voltage qualification rate, optimize the power supply scheme, and plan the power distribution network to improve the reliability of the voltage qualification rate and system operation management level, are of great significance. Its main functions are as follows:
1. Real-time monitoring. Real-time monitoring of high/low voltage side three-phase voltage, current, active power, reactive power, power factor, grid frequency, 12-channel fluorescent fiber temperature measurement, ambient temperature and humidity, etc.
2. Calculated data. 2~15 harmonics of high/low voltage voltage and current, voltage deviation, positive and negative sequence voltage, positive and negative sequence current, voltage unbalance degree and current unbalance degree.
3, real-time remote mail. There are 16 real-time remote signals, which can detect the state quantities such as the high and low voltage side switches of the transformer and the gear position of the on-load voltage regulating switch. When the switch state changes, the current state and time of occurrence shall be recorded and reported, and at least 200 recent switch shift sequence events shall be saved.
4. Real-time control. According to the collection of transformer current, voltage, active power, reactive power, grid frequency, temperature, humidity and other data to control the opening and closing of multiple switches, alarm signals, and so on.
5. Transformer fault life assessment. According to the above data, the cumulative running time of the transformer, the running time on load and the remaining life of the transformer are calculated.
II. Technical characteristics
1. Function configuration
(1) Power transformer fault analysis and diagnosis scheme.
(2) Transformer fault life assessment.
(3) 12 fluorescent optical fiber temperature alarm.
(4) Current limit alarm.
(5) Voltage limit alarm.
(6) PT disconnection alarm.
(7) Fan fault alarm
(8) The transformer door is tripped.
(9) Self-test of device failure.
(10) Abnormal operation alarm of the device.
2. Accessibility
(1) Through continuous self-inspection, the device can detect hardware failures, generate self-inspection reports, light up alarm LED lights, and send alarm reports to the SCADA system.
(2) Event records include 500 action reports, 500 alarm reports, 500 input shift reports, 500 output reports and 500 log reports.
(3) Disturbance records include 64 fault reports and 64 fault records.
(4) Recording data:
Number of cycles recorded: 25 cycles;
Sampling rate: 32 points per week;
Trigger condition: protection start;
Total storage time: 800 points.
(5) Data storage: No data loss when the auxiliary power supply disappears.
(6)8 sets of independent value group, stored in FLASH.
(7) DC power-down alarm.
(8) Support a variety of timing methods: IRIG-B code, SNTP pair, protocol pair, pulse per second (1PPS).
3. Measurement and control function
(1) 模拟量：IAH、IBH、ICH、UAH、UBH、UCH、I0H、IAL、IBL、ICL、UAL、UBL、UCL、I0L、P1、Q1、COS1、F1、P2、Q2、COS2、F2 等。
(2) open into the amount: 16 photoelectric isolation of the open into the channel.
(3) Control: 10-way trip export, 9-way signal export.
4. Communication function
(1) two RS485 communication interface, two Ethernet interface, support IEC60870-5-103 protocol, IEC60870-5-104 protocol, Modbus protocol and other protocols.
⑵ One RJ45 maintenance interface.
(3) One RS-485 (EIA) differential bus interface is used for IRIG-B code-to-time signal input.
(4)1 RS-232 communication serial port for printing.
3 Device Features
High-performance hardware design platform, processor CPU plus digital signal processor DSP modular design. The device is equipped with a protective starting element, and only the action of the protective starting element can open the positive power supply of the outlet relay, which truly ensures that any device is damaged and does not cause protection misoperation.
High-speed 32-point sampling, real-time parallel computing. Complete all protection logic measurements and calculations at each sampling point, as well as real-time collation of fault reports and event records.
The device adopts an integral panel and a fully enclosed chassis, and the strong and weak electricity are strictly separated. At the same time, corresponding anti-interference measures are taken in the software design. The anti-interference ability of the device is greatly improved, and the external electromagnetic radiation also meets the relevant standards.