JPH0214238U

JPH0214238U -

Info

Publication number: JPH0214238U
Application number: JP9215688U
Authority: JP
Priority date: 1988-07-11
Filing date: 1988-07-11
Publication date: 1990-01-29

Description

[Brief explanation of the drawing]

第１図は、実施例に係る変圧器保護制御装置の
ブロツク図、第２図は一系統の変圧器に関するシ
ステム全体を示す図、第３図は、一系統の変圧器
に関する保護制御システム全体を収容した筐体の
外観を示す図、第４図は、従来の変圧器制御部を
示す図。３……変圧器、５ａ，５ｂ……第１のＣＴ、６
……変圧器主保護リレー、７……フエイルセーフ
リレー、８……第２のＣＴ、９……変圧器制御部
、１１……表示部。 FIG. 1 is a block diagram of a transformer protection and control device according to an embodiment, FIG. 2 is a diagram showing the entire system for one transformer, and FIG. 3 is a diagram showing the entire protection and control system for one transformer. FIG. 4 is a diagram showing the appearance of the housing housing the transformer, and FIG. 4 is a diagram showing a conventional transformer control unit. 3...Transformer, 5a, 5b...First CT, 6
...Transformer main protection relay, 7...Fail safe relay, 8...Second CT, 9...Transformer control section, 11...Display section.

Claims

[Scope of claim for utility model registration] A transformer main protection relay that detects faults inside the transformer and suppresses its own relay operation when excitation current rushes, and a fail protector that compensates for malfunction of the transformer main protection relay. In a device comprising a safe relay and a transformer control unit that adjusts the winding ratio of the transformer according to the size of the load and sets the potential at the receiving end to a target value, the transformer main protection relay A signal proportional to the amount of current flowing through the primary and secondary sides of the transformer is converted into a digital signal, and based on the difference in conversion data between the primary and secondary sides, faults inside the transformer are detected, and excitation inrush is detected. The system splits the harmonic components of the current and suppresses its own relay operation when the excitation current rushes in. The fail-safe relay and the transformer control section are incorporated into a common calculation processing means, and the calculation processing The method is characterized in that the means detects a fault inside the transformer based on the conversion data, and calculates a transformation ratio that brings the potential at the receiving end to a target value based on the load current and line voltage. Transformer protection control device.