Important Information

This information is intended for professionals who are qualified to select and install this switching device. When using it, you must strictly adhere to the national standards relevant to the industry—though some of these standards may not be explicitly mentioned in this document.

Application

The switching capacitor switch is used to connect and disconnect capacitors in three-phase systems. Compared with other switching devices, this switch features zero inrush current during operation, no contact noise, and a significantly higher switching frequency. These advantages are achieved through the integration of a trigger circuit, thyristors, diodes, and several auxiliary components, making this switch ideal for applications involving rapidly changing loads.

Component units

This switching device primarily consists of components such as thyristors, a trigger circuit, an absorption circuit, heat sinks, and a cooling system. The trigger circuit monitors the voltage waveform around the zero-crossing point to determine whether to output a control signal (DC12V or 485), which then enables the thyristor to either turn on or turn off. The trigger circuit ensures reliable output of the control signal, while the efficient heat conduction of the heat sink, combined with the addition of a cooling fan, significantly enhances the device's overall cooling performance. Additionally, the unit features a built-in overtemperature protection switch and a temperature switch that automatically activates the cooling fan, creating optimal conditions for safe operation.

Installation Instructions

When installing the switching and disconnecting switch, please pay attention to the IP protection rating, temperature rating, and the maximum allowable installation height. Ambient temperature directly affects the electrical lifespan of the module equipment. If a single cabinet stacks modules with excessive capacity, it is recommended to install high-power fans for heat dissipation and cooling. The standard fan airflow rate should follow the specifications outlined in the table below.

If necessary, install a ventilation and cooling system in the distribution room. Ensure the modular equipment is installed smoothly, and maintain ample space around the installed cabinet to facilitate maintenance and inspection after installation.

Tip: This device is suitable for vertical installation. Ensure that the vertical distance between the switching units is at least 10 cm. If multiple rows are to be installed, arrange them in an alternating pattern to promote proper ventilation and heat dissipation, while maintaining a sufficient horizontal spacing for easy cable routing and enhanced cooling performance.

Equipment Inspection

Before preparing to install the equipment, please confirm the following preparatory steps:
1. Check whether the packaging box is intact and if there are any areas of significant damage to the packaging after transportation.
2. Inspect the mechanical and electrical components of the module equipment for any obvious damage.
3. Verify whether the module equipment's rated voltage, current, frequency, and other technical parameters match the local grid specifications.

It primarily features the following characteristics:

1. Zero-cross switching ensures no inrush current and prevents voltage flicker in the power grid.
2. Optoelectronic isolation, strong anti-interference capability, and fast response speed (20ms).
3. Integrated and compact, with a small footprint and easy installation.
4. The LED signal light indicates the switching status.
5. Built-in cooling fan with automatic fan start/stop control.
6. Built-in overtemperature (75°C) protection.
7. Fully cast structure, sturdy and durable.
8. Operation is silent, with no mechanical wear, significantly extending its service life.
Compared to traditional contactors, this switching capacitor switch features zero inrush current, no mechanical shock, no transient processes, zero mechanical wear, and virtually no noise. It can dynamically respond in real time to changes in system load, enabling precise switching of capacitors without causing voltage flicker in the system. Extensive long-term operation has demonstrated that this product maintains stable performance while ensuring safe and reliable operation.

Main Technical Parameters of Thyristor SwitchesModule

Electrical Connection Diagram

Equipment Maintenance

1. Regularly check whether the fan of the switching switch is operating properly, and replace it if necessary. When replacing, ensure that the new fan has the same capacity to prevent insufficient airflow, which could cause the thyristor to overheat and fail due to excessive temperature.
2. Regularly clean the cooling device to prevent any reduction in its cooling efficiency.

Fault code

1. Overcurrent
2. Overtemperature
3. Phase C Fault in Progress
4. C-phase neutral point anomaly
5. Phase A Input Fault
6. Phase A Zero-Point Abnormality
7. Runtime Phase Failure
Constantly lit: No zero point

Mechanical Installation Drawing