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On-line Monitoring and Compensation Device for Grounding Current of Transformer Core
Due to the floating position between the core and the earth, there will be a ground current. Under normal circumstances, this current value is very small, and the transformer core multi-point grounding, it will form a loop between the core and the earth, then the grounding current will increase many times, will endanger the normal operation of the transformer. One is to cause local short-circuit overheating of the iron core, which will cause local burning or damage of the winding of the iron core in severe cases, resulting in inter-turn or inter-phase fault; The second is to cause local overheating of the transformer and discharge fault due to circulation of the grounding wire of the iron core. LHTX1306B-RS series iron core/clamp intelligent cutting device is designed by Changsha Lanhong to provide overcurrent protection for iron core/clamp. It is divided into manual cutting and manual self-integrated cutting. The protection network is divided into three levels of switching, which can be switched according to the current size. If the measured current is greater than a certain value, a first-level resistor network can be put into the measured circuit to reduce the current value and achieve the purpose of protection; when the measured current returns to normal, the input resistor network can be withdrawn.
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1. Features: ◆ Microcomputer automatic control. ◆ Large LCD screen display, the current environment temperature, humidity, running status real-time monitoring. ◆ Special humidity 1% RH adjustable function, humidity setting range 10% ~ 98% RH. ◆ 1-24 hours timing shutdown function. ◆ automatic frost system in colleges and universities, low temperature application. Perfect system fault automatic diagnosis function, can quickly diagnose the unit operation fault. ◆ Continuous hose to achieve continuous drainage function. ◆ The bottom is equipped with a universal wheel, which can move freely. ◆ high quality centrifugal fan, strong wind, uniform airflow, low noise. International brand compressor, stable performance, long-lasting dehumidification effect, strong.
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1. Features: ◆ Microcomputer automatic control. ◆ Large LCD screen display, the current environment temperature, humidity, running status real-time monitoring. ◆ Special humidity 1% RH adjustable function, humidity setting range 10% ~ 98% RH. ◆ 1-24 hours timing shutdown function. ◆ automatic frost system in colleges and universities, low temperature application. Perfect system fault automatic diagnosis function, can quickly diagnose the unit operation fault. ◆ Continuous hose to achieve continuous drainage function. ◆ The bottom is equipped with a universal wheel, which can move freely. ◆ high quality centrifugal fan, strong wind, uniform airflow, low noise. International brand compressor, stable performance, long-lasting dehumidification effect, strong.
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On-line Monitoring System of GIS Partial Discharge
The GIS partial discharge on-line monitoring system consists of three parts: ultra high frequency (UHF) sensor, signal acquisition device, partial discharge monitoring IED communication unit and monitoring system server. Multiple partial discharge IEDs can form a distributed monitoring system, and multiple devices can be monitored on-line at the same time. The local data processing in the monitoring system is used to process and digitize the signals obtained by the partial discharge monitoring IED, the computer of the server is used to screen, analyze and complete the functions of the local discharge signal, such as recording the value of the local discharge pulse and monitoring the development of the local discharge volume.
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