中性点接地电阻柜装置特点
Features of neutral grounding resistance cabinet
1、针对性强，保护到位
1, targeted, protection in place
变压器中性点接地电阻柜适用于系统中性点采用小电阻或中电阻接地的场合。此时，电网出现单相接地故障时需立即跳闸切除故障线路。当电网出现单相接地时，接地电阻向接地点提供附加阻性电流，使接地电流呈阻容性质，从而保证产生的过电压不超过2.6倍的相电压。
The transformer neutral grounding resistance cabinet is suitable for the occasion where the neutral point of the system is grounded by small or medium resistance. At this point, when a single phase earth fault occurs in the power grid, it is necessary to immediately trip out the fault line. When single-phase grounding occurs in the power grid, the grounding resistance provides additional resistance current to the grounding point, making the grounding current resistance-capacitive, thus ensuring that the generated overvoltage does not exceed 2.6 times the phase voltage.
2、结构紧凑，便于安装
2. Compact structure and easy installation.
变压器中性点接地电阻柜将零散的Z型接地变压器（如系统无中性点引出则需加装）、电阻器、电流互感器、测量仪表、接地保护输出端子等电器设备整体组合在一个封闭金属柜内，而且可以选配隔离开关，成套供货，安全可靠性高，布置清晰整齐，便于安装调试及操作维护。
Transformer neutral grounding resistance cabinet integrates scattered Z-type grounding transformer (if the system has no neutral point to be added), resistor, current transformer, measuring instrument, grounding protection output terminal and other electrical equipment in a closed metal cabinet, and can be equipped with isolation switch, complete supply, safe and reliable The layout is clear and neat, convenient for installation, commissioning, operation and maintenance.
3、选材考究，充分保证产品质量
3, material selection, fully guarantee product quality.
变压器中性点接地电阻柜内的接地变压器为优质干式变压器，其一次绕组为“Z”形接线；电阻器采用不锈钢合金、镍铬合金等材料制成，导电率高、通流能力强、耐高温、最高使用温度可达1600℃；温度系数≤ -0.045% /℃、阻值稳定、耐腐蚀、防燃防爆、可靠性高。
The grounding transformer in the neutral grounding resistance cabinet of transformer is a high-quality dry-type transformer with "Z" primary winding; the resistor is made of stainless steel alloy, nickel-chromium alloy and other materials, with high conductivity, strong current-carrying capacity, high temperature resistance, and the highest operating temperature up to 1600'; the temperature coefficient < 0.045%/, resistance value. Stable, corrosion resistant, flameproof, explosion-proof and high reliability.
4、监测功能齐全，并提供模拟量输出
4, the monitoring function is complete, and provide analog output.
变压器中性点接地电阻柜可配备电流互感器和动作记录仪，正常时可监视中性点不平衡电流；出现单相接地故障时，可记录动作次数；且可给保护和监控系统提供模拟量输出；还可根据需要加装专用避雷器。同时应用户要求本设备可加装测控保护装置。
The transformer neutral grounding resistance cabinet can be equipped with current transformer and action recorder, which can monitor the unbalanced current of neutral point when normal, record the number of actions when single-phase grounding fault occurs, provide analog output for protection and monitoring system, and add special arresters as needed. At the same time, the equipment can be installed with the measurement and control protection device.