In order to consider things ubiquitous power needs of future development, maturity and uniformity considering technology, iHPS-3300 switchgear (RMU) partial discharge line temperature monitoring device and a sensing device uses a UHF principle PD monitoring, along with the surface of the corona discharge inside the discharge and noise measurements. 
I. Overview
of high voltage switchgear using very wide and the largest number of switching devices. Because there are varying degrees of problems in the design, manufacture, installation and operation and maintenance, and therefore the accident rate is relatively high, a lot of nature in the switchgear accident, the accident occurred in the insulation of 10 kV and above voltage level, the consequences it is also very serious. In particular car switchgear, insulation higher accident rates, and often an accident, affecting neighbor cabinet is more striking. Therefore, an urgent need for the implementation of the switchgear condition-based maintenance, operational status of devices in real time and timing of on-line monitoring, according to the degree of deterioration of operating conditions and insulation of equipment, determine asked and measures to overhaul, reduce outage time and accidents, improve safety and reliability of electric power automation equipment running.
Voltage Switchgear outer insulation fault mainly flashover breakdown of insulation, the insulation breakdown of flashover, breakdown phase insulation flashover, flashover lightning overvoltage breakdown, the sleeve insulator, the sleeve flash capacitor network, flashover, flash strike, breakdown, explosion, lift lever flashover, CT flashover, breakdown, explosion, porcelain fracture.
The development of various types of insulation defects to the final breakdown, before they result in accidents, often the first stage after partial discharge, partial discharge can reflect the strength of the insulating state, and therefore to determine insulated switchgear for the realization of the state line insulation monitoring through online partial discharge monitoring and effective means of diagnosis.
Ho Chi IHPS-3300 High Voltage Switchgear electrical partial discharge and partial discharge line temperature monitoring device is generated by detecting electromagnetic radiation and concomitant temperature rise phenomenon switchgear connectors, electromagnetic radiation in the frequency range of 10 ~ 100MHz and automatically determines scanning means partial discharge frequency actually detected, then the detected partial discharge pulses and data clusters switchgear head temperature data upload DTU.
1.1 switchgear structure
switchgear provided with a circuit breaker, CT, PT, protective relay, detection equipment and auxiliary equipment, in addition to external line, switch cabinets are connected by a wiring formed in the metal casing, shown in Figure 1.
1.2 insulation defect power switchgear device
high voltage switchgear with a variety of electrical equipment, such as circuit breakers, MOF, VCB, CT, PT , LA, COS, PF, MOLD TR, busbars, equipment and the low-voltage switchgear MCCB , CT, PT, CV switchgear. Comprising switchgear equipment failure due to an insulation defect caused by prolonged use, due to poor connection contacts instantaneous discharge, and short circuit the respective connecting portions, overheating, the surge current caused by failure or the like. FIG 2 graph shows the causes of the fault by the distribution switchgear.
1.3 partial discharge generated
partial discharge, an electric insulation medium is discharged, the discharge is limited only in a portion of the measured medium and only a partial insulating bridge between the conductors, this discharge may occur or may not occur to the conductor proximity. Some weak parts in the insulation of electrical equipment under the action of a strong electric field of high voltage insulation partial discharge is a common problem. While the partial discharge generally does not cause penetration of the insulation breakdown, but may result in a dielectric (in particular organic medium) local damage. If the partial discharge persistent, under certain conditions even leads to deterioration of insulation breakdown. Power equipment partial discharge test, not only to understand the insulation condition of the equipment, but also to discover many of the problems related to the manufacture and installation of insulation to determine the cause and severity of the fault. Thus, power equipment partial discharge test is an important test preventive power equipment manufacturing and operation.
Various partial discharge detection technologies have emerged Based on various electric, optical, acoustic, thermal phenomenon occurred when a partial discharge generated, the partial discharge detection technique appeared a corresponding electrical light detection method and the measurement method, acoustic non-power detection, infrared and other thermal methods. In recent years, with the improvement and advancement of partial discharge detection, using electromagnetic radiation detection signal PD has become a simple method of detecting.
Second, the temperature and partial discharge switchgear apparatus Introduction
2.1 means described
the apparatus is set for detecting, analysis and continuous monitoring of high voltage switchgear line monitoring of partial discharge signals and switchgear head temperature rise. As shown below, IHPS-3300 type apparatus for processing bureau host acquired from the UHF amplifier and temperature sensor signals obtained from the passive wireless temperature sensor and digitized, and the host computer using the partial discharge signal filter, analyze and complete the PD pulses recorded values, partial discharge monitoring developments and other functions.