GDBZ-IV 220/110kV Main Transformer Comprehensive Test System

Overview: the GDBZ-IV computer-controlled transformer comprehensive test system is designed and manufactured to the test items and requirements specified by the purchaser, using a PLC as the control core and an industrial control computer as the human-machine interface. It is dedicated equipment for transformer routine tests, selected type tests and special tests. It provides automatic no-load and load loss measurement and automatic induced withstand voltage testing for 110 kV to 220 kV class power transformers, and all test items can be operated through the transformer comprehensive test software. It offers high reliability, an intuitive interface, simple operation and comprehensive protection. The system consists mainly of the test operating console, the test control system, the test measurement system, the test software, the database and the test report.

Features: the console is of flat construction and carries only the industrial control computer; all other electrical equipment and components are installed in the switchgear cubicles of the equipment room, so the operating section is completely isolated from the electrical circuits. The complete system is controlled by the computer together with the PLC. The PLC mainly sets the logical relationships between components, integrates and executes the low-level action commands, and implements the basic protection functions of the system; it offers flexible programming, high reliability and fast action execution. The industrial control computer organises the test flow, issues the action commands and implements the advanced protection functions. It communicates with the PLC by wireless transmission, so the two are completely isolated, which effectively prevents interference of the communication signals and guarantees the safety of the computer when the test object faults to ground.

Voltage and current regulation during performance tests is handled by a variable-frequency drive, giving multi-step adjustment of the voltage raise and lower rate for finer voltage and current regulation and more accurate data sampling. Test data is measured jointly by precision measuring instrument transformers and a power analyser; the power analyser used together with high-precision measuring instrument transformers measures transformer loss data accurately.

Software: every operation in the software is a one-key operation. The interface of the complete test equipment is friendly and simple to operate, alarm and prompt information is comprehensive, and the interface of every test item shows the open and closed state of each component in the circuit in real time.

Data and reporting: after each test item finishes, its test data and calculated results are saved into the test database by serial number. Through a separate test data query and report generation program, data can be retrieved by serial number and a test report generated in the format specified by the user. The report can be saved as an Office Excel spreadsheet, converted to PDF or Word, and printed directly on a desktop printer. The report format can be generated to the customer requirement.

Technical requirement: the system handles power transformers of 120000 kVA and below at 110 kV and below, and power transformers of 360000 kVA and below at 220 kV and below.