High-precision electrical parameter measurement dry-type reactor on-line monitoring device and method

Abstract

The invention discloses an on-line monitoring device and method for a dry-type reactor with high-precision electrical parameter measurement. The instantaneous value of the secondary side voltage of the three-phase bus voltage transformer connected to the AC bus is subtracted from the ground voltage of the neutral point voltage transformer. The instantaneous value of the dry-type reactor is obtained by obtaining the three-phase terminal voltage of the dry-type reactor, which realizes the accurate measurement of the terminal voltage of the dry-type reactor, and collects the current of the dry-type reactor through the current transformer and the dry-type reactance on-site monitoring unit, and then The reactive power (capacity), active power (loss), loss ratio, and inductance value of the dry-type reactor are obtained through simple calculation of the voltage and current, and the calculated loss ratio, inductance value and the rated value are compared. When the preset value is exceeded, a corresponding alarm signal will be sent to notify the relevant personnel to remove the faulty dry-type reactor, thereby realizing the online monitoring of the dry-type reactor, which can effectively avoid accidents and ensure the safe and reliable operation of the substation.

Description

technical field [0001] The invention belongs to the technical field of monitoring equipment for dry-type reactors, and relates to an on-line monitoring device and method for dry-type reactors with high-precision electrical parameter measurement. Background technique [0002] So far, many substations and converter stations have experienced severe dry-resistance burning accidents, including ultra-high voltage, ultra-high voltage substations and UHV converter stations. These accidents have seriously affected the safe operation of power stations and caused huge losses. [0003] There are many reasons for dry reactor burnout, for example: dry reactor coils generally use cylindrical winding, each reactor coil is composed of multiple packages, the turn insulation between wires is very thin, burrs on the wire surface, metal debris or Other foreign objects can easily pierce the turn insulation, causing inter-turn short circuit and forming a short circuit ring. As long as there is an...

AI Technical Summary

Problems solved by technology

[0008] In short, due to the above reasons, even if the instantaneous value of the terminal voltage and current of the reactor can be collected, because these quantities are not sine waves, directly using them to calculate the parameters of the reactor will cause a large deviation, causing Device missed or false alarm

[0009] (c) Since the installation position of the voltage transformer on the bus connected to the reactor is a certain distance from the control room, and the distance of different substations is different, the connection line from the secondary side of the voltage transformer to the control room has impedance, this impedance It will cause a large measurement deviation, which is also likely to cause missed or false alarms of the device

Images