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N600 grounding online monitoring device
During normal operation of the substation, the secondary circuits of several groups of voltage transformers connected through the zero-phase small bus (N600) in the control room shall only be reliably grounded at N600 point in the control room, and the secondary neutral point of each voltage transformer shall be disconnected at the grounding point of the switching site. If the secondary neutral point N600 of the voltage transformer in the substation is grounded at multiple points, it may cause the phenomenon of distance protection and zero sequence direction protection refusing or misoperation. LHTX1306B type voltage transformer secondary neutral point N600 grounding online monitoring device through real-time online capture instantaneous current changes, and analysis, judgment, alarm, accurate realization of substation voltage transformer secondary neutral point N600 grounding wire real-time monitoring, timely detection of security risks, to provide operators with accurate and direct basis for judgment.
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Line Arrester On-line Monitoring System
The system uses embedded microcomputer technology to collect the state data of the line arrester, which is divided into two working modes: regular collection and lightning collection. The regular acquisition mode is mainly applicable to the regular acquisition of the leakage current and action of the arrester, and the real-time alarm feedback of the abnormal monitoring results. It also has extended functions, such as the acquisition of the surge arrester impulse current, ambient temperature, humidity and other data. The lightning acquisition mode is mainly used to collect and accumulate the number of lightning falls when the lightning arrester falls. The collected lightning arrester monitoring data is transmitted to the background system through GSM communication network.
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On-line monitoring device for partial discharge of switch cabinet
LHJF21 switchgear partial discharge on-line monitoring system mainly uses ultra-high frequency and ultrasonic partial discharge sensors to detect partial discharge signals of electrical equipment during operation, so as to judge whether there is insulation hidden danger inside high voltage electrical equipment. When insulation defects occur inside high voltage electrical equipment, partial discharge signals will be generated. Through the detection and analysis of the PD signal, it can determine whether there is a hidden insulation hazard in the high-voltage electrical equipment, and prevent the further expansion of potential accidents.
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Integrated on-line monitoring device for cable sheath
The LHDL1908 cable sheath integrated on-line monitoring device adopts the principle of circulating current method, that is, under normal circumstances (I .e. one-point grounding), the circulating current on the metal sheath of single-core cable is extremely small, mainly capacitive current, and once the metal sheath forms a loop with multi-point grounding and the earth, the circulating current increases significantly, reaching more than 90% of the main current in serious cases. Real-time monitoring of metal sheath circulation and its variation can realize on-line monitoring of multi-point grounding fault of single-core cable metal sheath, so as to timely and accurately find grounding fault, fundamentally avoid the occurrence of cable accidents, and ensure the safe and reliable operation of the cable. The LHDL1908 adopts GSM or RS485 as the communication mode, which is suitable for multi-point ground fault monitoring of single-core cables above 35kV.
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On-line monitoring of SF6 micro-water density
The product realizes the data real-time monitoring, data remote transmission, fault warning, background display and trend analysis of SF6 gas micro-water pressure density, and provides reliable information and important support for state maintenance and intelligent substation construction. The system is suitable for on-line monitoring of SF6 gas micro-water and pressure density of high-voltage switches and combined electrical equipment. The equipment has high stability and reliability, reliable power supply, and strong resistance to strong electromagnetic interference, which effectively improves the safety and operation of the equipment. Service life.
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