1、 Product Overview:
SCTK type intelligent three-phase synchronous switch. It is the switching device for capacitors in our company's new generation low-voltage reactive power compensation device. It is an environmentally friendly and energy-saving intelligent control execution device, with three models: common compensation SCTK-G, sub compensation SCTK-F, and phase compensation SCTK-X.
This product is suitable for on/off control of low-voltage reactive power compensation capacitors and complies with the GB/T 29312-2012 standard for low-voltage reactive power compensation switching devices. Suitable for use in dispersed and stable loads, as well as in residential, urban, and rural network renovations.
This product has significant technical advantages compared to switch components such as AC contactors, thyristors, or solid-state relays. The main advantage is that after receiving external control signals, the optimal cutting point can be automatically found through logical judgment; Ensure zero crossing switching and no surge current; Contact points are not sintered; Low energy consumption; No harmonic injection; Compared with similar products, it has great progressiveness in technology, high efficiency and low consumption, environmental protection and energy saving, especially in terms of inrush current and safety and reliability.

2、 Technical parameters:
1. Working environment conditions
Environmental temperature: -40 ℃ to+85 ℃;
Relative humidity: 20% to 90% at 40 ℃;
Altitude: The altitude of the installation site shall not exceed 2500m
Environmental conditions: There is no explosion hazard in the surrounding medium, no gas that can damage insulation or corrode metals, no conductive dust, and the installation site cannot vibrate violently.

2. Rated voltage, working power supply, and rated current
Rated working voltage: 380V (total compensation)/220V (partial compensation) three-phase four wire AC 50Hz
Allowable deviation: The synchronous variation of three-phase voltage shall not exceed ± 20%; The waveform is a sine wave with a distortion of less than 5%;
Rated frequency: 50HZ ± 5HZ

3. Main technical indicators:
Service life: 500000 cycles
Number of phases: Three phases (delta connection); Single phase (Y-shaped connection)
Control capacity: ≤ 30Kvar Average power consumption: ≤ 1W
Response time: ≤ 100ms
Interval between two consecutive connections: 0-600s seconds

Control method:
1.485 communication (ModBus communication protocol).
2. Remote control terminal (DC+12V).

3、 Main technical features
1. This product adopts a low-power, high anti-interference microcontroller system, and utilizes advanced software algorithms and detection circuits for comprehensive protection and reliable operation.
2. By using high-speed A/D sampling and FFT algorithm, accurate zero crossing switching of capacitors is achieved, with no inrush current, no flashover, and no harmonic injection.
3. Due to the use of permanent magnet switches, power consumption only occurs during the switching action, which is energy-saving and environmentally friendly; Permanent magnet switches have low contact resistance and low heat generation at the contacts, resulting in low power consumption, long lifespan, and high reliability of the device.
4. The remote control terminal and communication port adopt optoelectronic isolation technology, with strong anti-interference ability and safe and reliable operation.
5. Key control, digital display, real-time display of working status, and on-site modification of address parameters.
6. Intelligent monitoring of the operation status of switches, power supplies, and loads, with complete protection functions:
1) Power supply voltage phase loss protection
2) Undervoltage protection
3) Self diagnostic fault protection
4) Power outage protection