产品概述 Product description

PSTN-SCL系列，品采用了双过零投切技术，以保证投切电容时不会产生过电压、高涌流，从而延长电容器的使用寿命以及开关的百万次的投切寿命。产品保护功能齐全，具备电容器体内温度、电网谐波含量、过电流、过电压、欠电压、三相不平衡等特殊保护，使产品更加安全可靠。

The PSTN-SCL series adopts a dual zero-crossing switching technology to ensure no overvoltage or high inrush current during capacitor switching, thereby extending the lifespan of capacitors and the million-cycle switching life of switches. The product features comprehensive protection functions, including internal capacitor temperature monitoring, grid harmonic content, overcurrent, overvoltage, undervoltage, and three-phase imbalance protection, ensuring enhanced safety and reliability.

智能控制网络 Intelligent Control Network

● 智能补偿模块与无功补偿控制器或主机间是通过通讯组网后进行信息交换和控制的。除了一次电源接线，不需要二次信息接线，极大地简化了安装接线，减少了因为接线引起的各种故障，提供了可维护性。

● 无功补偿控制器与智能补偿模块可自己形成控制网络。当无功补偿控制器离线，系统中智能补偿模块可自动产生唯一主机，该主机可通过外置互感器配件测量系统常规电参量，并通过通讯控制其它模块。当无功补偿控制器重新在线，该主机自动变成从机。

● The intelligent compensation module exchanges information and controls with the reactive power compensation controller or host through communication networking. Apart from primary power wiring, secondary information wiring is unnecessary, significantly simplifying installation and reducing various faults caused by wiring issues while enhancing maintainability.

● The reactive power compensation controller and the intelligent compensation module can form their own control network. When the reactive power compensation controller goes offline, the intelligent compensation module in the system can automatically generate a unique host. This host can measure the system's conventional electrical parameters through external current transformer accessories and control other modules via communication. When the reactive power compensation controller comes back online, the host automatically switches to a slave mode.

双过零投切技术 Double zero crossing switching technology

该技术主要是微处理器能根据控制命令和当前电容两端电压过零点相结合进行电压过零投入，能根据控制命令和电流过零点相结合进行电流过零切除，达到对电容器无涌流投切、开关触点无拉弧的效果。该技术由过零检测电路、磁保持继电器驱动电路、磁保持继电器和微处理器组成。

This technology mainly enables the microprocessor to perform voltage zero crossing input based on control commands and the current zero crossing voltage at both ends of the capacitor. It can also perform current zero crossing cutoff based on control commands and current zero crossing voltage, achieving the effect of no inrush current switching of capacitors and no arcing of switch contacts. This technology consists of a zero crossing detection circuit, a magnetic holding relay drive circuit, a magnetic holding relay, and a microprocessor.

多重保护技术 Multiple protection technology

● 多重保护技术主要分硬件保护和软件保护：

● 其中软件保护有过流保护、三相不平衡保护、过温保护、过电压保护、欠电压保护和谐波保护。

● 过流保护主要是在补偿模块产生无功电流达到设定值后，模块主动切除，防止补偿模块损坏。

● 三相不平衡保护应用于共补模块中，一般在三相电压平衡系统中，三相无功电流也应该平衡的。当某一相出现故障时，三相无功电流表现为不平衡，此时如果不切除保护，会导致另外两相的无功电流明显增大，导致模块发热和模块衰减。

● 过温保护是后备保护，通过预埋在电容器中的温度传感器实现的。在其他保护未动作时，如果补偿模块温度到达设定值（55℃），模块主动切除，等温度降低到（50℃）以下，解除保护。

● 过电压、欠电压和谐波保护是无功补偿控制器或主机提供的保护，发送保护时，控制器会逐步切除系统补偿模块。

● 当上述保护不能及时保护时，为了防止补偿模块不会发生爆炸而引起恶性事故，补偿模块提供了硬件保护。它是在补偿模块内部嵌入了类似于保险丝的安全件，当补偿模块发热外壳发生变形时，变形的拉力会把这个安全件拉断，从而使模块强制断电。

● Multiple protection technology mainly includes hardware protection and software protection.

● The software protection includes overcurrent protection, three-phase imbalance protection, overtemperature protection, overvoltage protection, undervoltage protection, and harmonic protection.

● Overcurrent protection is mainly used when the reactive current generated by the compensation module reaches the set value, and the module actively cuts off to prevent damage to the compensation module.

● Three phase unbalance protection is applied in the common compensation module. Generally, in a three-phase voltage balance system, the three-phase reactive current should also be balanced. When a fault occurs in one phase, the three-phase reactive current shows imbalance. If the protection is not cut off at this time, it will cause a significant increase in reactive current in the other two phases, resulting in module heating and module attenuation.

● Overtemperature protection is a backup protection achieved through temperature sensors embedded in capacitors. When other protections are not activated, if the temperature of the compensation module reaches the set value (55 ℃), the module will actively cut off. When the temperature drops below (50 ℃), the protection will be released.

● Overvoltage, undervoltage, and harmonic protection are protections provided by reactive power compensation controllers or hosts. When sending protection, the controller will gradually cut off the system compensation module.

● When the above protection cannot be timely protected, in order to prevent the compensation module from exploding and causing malignant accidents, the compensation module provides hardware protection. It embeds a safety component similar to a fuse inside the compensation module. When the heating shell of the compensation module deforms, the deformed tension will pull the safety component apart, forcing the module to shut down.