中性点接地电阻柜装置特点
Characteristics of neutral grounding resistance cabinet
1、针对性强，保护到位
1, strong pertinence, 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 point grounding resistance cabinet is suitable for the system neutral point with small resistance or medium resistance grounding. 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 the power grid appears single-phase grounding, the grounding resistance provides an additional resistive current to the connection place, so that the grounding current is resistance to capacitance, thus ensuring the generated overvoltage not more than 2.6 times the phase voltage.
2、结构紧凑，便于安装
2, compact structure, easy to install
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。
The transformer neutral grounding resistance cabinet combines the scattered Z type grounding transformers (such as the system without neutral point extraction), resistor, current transformer, measuring instrument, grounding protection output terminal and other electrical equipment in a closed metal cabinet, and can be selected 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. The material is carefully selected and the quality of the product is guaranteed.
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 transformer neutral grounding resistance cabinet is a high quality dry type transformer. Its primary winding is a "Z" connection. The resistor is made of stainless steel alloy, nickel chromium alloy and so on. It has high conductivity, high flow ability, high temperature resistance, and maximum use temperature of up to 1600 C; temperature coefficient is less than -0.045% / C, and 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 functions are complete and the analog output is provided.
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。
Transformer neutral grounding resistance cabinet can be equipped with current transformer and action recorder. It can monitor neutral point unbalance current when it is normal. When single phase grounding fault occurs, the number of actions can be recorded; and the analog output can be provided to the protection and monitoring system, and a special lightning arrester can be added according to the need. At the same time, the equipment can be installed with the measurement and control protection device.