Online insulation monitoring system

Abstract

The invention discloses an online insulation monitoring system. A station-end information management unit transmits a collection command; a sensor collects data after receiving the collection command to synchronously start the collection of current and voltage signals; and the wirings between the sensor and an apparatus to be monitored are simplified without changing the grounding connection state of the apparatus to be monitored by separating the sensor from an in-situ data processing unit and mounting the sensor close to the apparatus to be monitored. Meanwhile, an optical fiber is used for substituting for the conventional cable to achieve the signal transmission among systems at low noise. Accordingly, the online insulation monitoring system is suitable for long-distance signal transmission in the environment of strong electric field and strong magnetic field of substations.

Description

technical field [0001] The invention relates to the technical field of on-line insulation monitoring of electrical equipment, in particular to an on-line insulation monitoring system. Background technique [0002] Insulation on-line monitoring is a technology for monitoring the insulation status of high-voltage electrical equipment in operation. The key to this technology is the synchronization of leakage current of high-voltage electrical equipment and system voltage sampling. The patent with the application number 03129228.3 proposes an online monitoring method for the insulation of high-voltage electrical equipment based on the reference phase method. This method uses the reference phase to solve the problem of sampling synchronization. The distance between the unit and the equipment to be monitored is relatively long, resulting in cumbersome wiring and potential safety hazards, and the on-site data processing unit is connected to the station-side information management u...

AI Technical Summary

Problems solved by technology

The patent with the application number 03129228.3 proposes an online monitoring method for the insulation of high-voltage electrical equipment based on the reference phase method. This method uses the reference phase to solve the problem of sampling synchronization. The distance between the unit and the equipment to be monitored is relatively long, resulting in cumbersome wiring and potential safety hazards, and the on-site data processing unit is connected to the station-side information management unit through cables, which does not achieve complete isolation and protection of electrical signals

The patent application number 200720052083.4 proposes an on-line monitoring system for capacitive equipment insulation based on GPS clock signals, which uses a method of synchronous sampling based on the GPS clock, which can well solve the problem of synchronous sampling signals problem, but it is necessary to add GPS equipment to each device, the cost is relatively expensive, and the sensor is also built into the local data processing unit, which cannot realize the local installation of the equipment to be monitored

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