Photovoltaic anti-island protection device TC-3087

1, anti-island protection device TC-3087 application range

       The photovoltaic anti-island protection device TC-3087 is suitable for clean power supply or small power supply system connected to the grid, and its public grid distribution system connected to the grid power supply。Due to external causes or natural causes of grid connection system,It's possible to isolate the local power system,This is very harmful to the on-site power generation equipment and the system grid,General inverters and wind power generation systems have their own anti-island function,But to be safe and secure,The external connecting points can also be installed with anti-island protection devices,In the event of an island phenomenon,As backup protection, distributed island power can be quickly cut out,Therefore, the device can fully meet this function。 

       The task of anti-island protection device is to monitor the low-voltage side of distribution transformer in real time.Necessary control of clean power supply。The microcomputer device and control circuit specially designed for the island can ensure the rapidity of protection action and the accuracy of control。

2. Main features of anti-island protection device TC-3087

       2.1 The TC-3087 device can be centrally assembled or dispersed on the high voltage switchgear，Each interval functions independently，The anti-island devices are connected only through the network，Information sharing，This makes the whole system not only flexible，And its reliability has also been greatly improved，The failure of any one device affects only one local component。

       2.2 High performance processor and high resolution A/D converter are adopted, 32 sampling points per week, combined with special measurement CT, to ensure the high precision of remote measurement。

       2.3 The protection function does not depend on the communication network at all, and the failure of the network does not affect the normal operation of the protection。

       2.4 Anti-island protection device adopts full seal design, coupled with well-designed anti-interference components, so that the anti-vibration ability, anti-electromagnetic interference ability has been greatly improved。

       2.5 Designed with hardware and software dual watchdog function, so that the whole system has a high measurement accuracy and anti-interference ability。

       2.6 Friendly man-machine interface, the device adopts the Chinese large-screen LCD display, trip report, alarm report, remote message, telemetry, set value setting, etc. are clearly marked in Chinese characters on the LCD, easy for users to use and master。

       2.7 Communication mode using CAN port, that is, controller area network interface (or 485 interface)，Its characteristics are: simple structure，There are only two wires connected to the outside;Transmission speed up to 1Mbps;Transmission distance up to 10KM;CRC testing is adopted and error handling capability can be provided.Using non-destructive bus arbitration technology，The station communication has high efficiency and anti-interference ability。

 3, anti-island protection device TC-3087 main function introduction

       Anti-island protection device TC-3087 in addition to the remote closing functions of island trip and island recovery, in the operation of the system, the device constantly monitors the bus voltage and measure the current, and has the alarm function for abnormal current and voltage, the Settings are as follows:

       (1) Overvoltage trip (optional backout)

       (2) Low voltage trip (optional drop back)

       (3) Pressure automatic closing (optional back)

       (4) Over frequency trip (optional back)

       (5) Low frequency trip (optional drop back)

       (6) Instantaneous reverse power discrimination trip (optional backout)

       (7) Isolation protection discrimination.(Optional withdrawal)

       (8) Measurement and control functions: U, I, P, Q, cosΦ, F (requires measurement current and voltage input)

       (9) Optional automatic recovery closing function

4. Function description of anti-island protection device TC-3087

       The normal operation mode of the power supply system of the clean power supply project: a 10kV/400V distribution transformer supplies power normally, while the clean power supply is connected to the grid, and the control requirements are as follows:

       (1) If the current value of the measuring point is too high and crosses the line (by setting parameters), the anti-island protection device TC-3087 will send alarm information on the LCD display, and the alarm information can be uploaded through communication。

       (2) Real-time detection of AC power grid (AC380V, 50Hz) power supply circuit three-phase voltage, current (measuring point), to determine the power flow direction and power size。If there is a voltage on the system side during the initial power-on process of the device, and it is greater than the voltage setting value, the device is powered on automatically. In addition, after a low voltage trip occurs, the device can automatically determine that there is a voltage recovery closing function without losing power.

       (3) The anti-island protection device is equipped with overvoltage protection trip, low current protection trip, high frequency protection trip, low frequency protection trip, instantaneous reverse power discrimination trip, to prevent the island phenomenon caused by the impact on the system grid and equipment damage。