SHFS series high-capacity low-voltage reactive rapid switching device

Abstract

The utility model belongs to the technical field of power electronics, and particularly relates to an SHFS series high-capacity low-voltage reactive rapid switching device, which comprises a stainless steel shell, and an anti-parallel thyristor assembly, a PC protection device, a control circuit PCB (printed circuit board) and an over-temperature protection device are fixed in the stainless steel shell. The anti-parallel thyristor assembly, the PC protection device, the control circuit PCB and the over-temperature protection device are electrically connected with one another, the whole device is packaged by a stainless steel shell, and the device has the effects of fast response, no inrush current in switching, convenient installation and simple maintenance, is an ideal choice of a switching capacitor bank for a reactive power dynamic compensation device, and has a wide application prospect. The device is mainly composed of an anti-parallel thyristor assembly, an isolation circuit, a trigger circuit, an over-temperature protection device and a PC protection device. Thyristor modules control logic voltage to control on (12V) and off (OV) of a switch through an external terminal.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, concretely is a SHFS series large capacity low voltage no -function fast switching device. BACKGROUND

[0002] When the power grid is running, the reactive power supplied by the power supply is the premise of converting electric energy into other forms of energy, which creates conditions for the transmission and conversion of electric energy. Because there are a large number of resistive and inductive loads in the electrical equipment, the power grid must provide a certain proportion of "reactive power" in addition to "active power" in order to make the entire power grid normal use and operation;

[0003] However, the existing no -function fast switching device still has the following technical problems when in use:

[0004] The existing switching device is slow in response when in use, is not convenient to install, is difficult to maintain, has poor anti-interference effect, and is easily disturbed during work.

[0005] Therefore, the SHFS series large capacity low voltage no -function fast switching device is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a SHFS series large capacity low voltage no -function fast switching device to solve the problems in the above background technology.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a SHFS series large capacity low voltage no -function fast switching device, including stainless steel shell, the inside fixed of stainless steel shell has anti-parallel thyristor assembly, PC protection device, control circuit PCB board and over-temperature protection device, anti-parallel thyristor assembly, PC protection device, control circuit PCB board and over-temperature protection device are mutually electrically connected.

[0008] Preferably, the right side of the stainless steel shell is provided with a power inlet hole.

[0009] Preferably, the front upper end of the stainless steel shell is fixed with a wiring panel.

[0010] Preferably, the upper side of the stainless steel shell is provided with a switching indicator lamp.

[0011] Preferably, the control circuit PCB board includes a trigger circuit and an isolation circuit.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The patent is packaged with a stainless steel shell, has the effects of quick response, no inrush current in switching, convenient installation, and simple maintenance, is an ideal choice for switching capacitor groups of reactive power dynamic compensation devices, and mainly comprises an anti-parallel thyristor assembly, an isolation circuit, a trigger circuit, an over-temperature protection device, and a PC protection device, a control logic voltage of the thyristor module is controlled by an external wiring terminal to control a switch to be turned on (12V) or turned off (OV); the trigger circuit adopts an advanced zero-crossing trigger technology, can realize zero-crossing conduction of the thyristor module voltage, and turns off when the current is zero, thereby ensuring that there is no inrush current in the capacitor during switching; the temperature control technology reliably ensures that the thyristor works within a specified temperature, when the temperature exceeds a threshold value due to some abnormal reasons, the switch automatically exits work, thereby protecting components from being damaged; in order to improve the anti-harmonic ability of the switch, a stable and effective protection circuit is arranged, thereby prolonging the service life of the device, and the device has the functions of three-phase switching and separate-phase switching, is reasonable in design, and is convenient to debug. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is an external structure schematic diagram of the utility model;

[0015] Figure 2 It is an internal module component diagram of the utility model;

[0016] Figure 3 It is a working circuit diagram of the utility model;

[0017] Figure 4 It is a secondary diagram of the separate compensation switch;

[0018] Figure 5 It is a secondary diagram of the common compensation switch;

[0019] Figure 6 It is a MOC3083 pin diagram.

[0020] In the drawing: 1, stainless steel shell, 2, anti-parallel thyristor assembly, 3, PC protection device, 4, control circuit PCB board, 5, over-temperature protection device, 6, power supply wire hole, 7, wiring row, 8, switching indicator light. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] In the description of the utility model, need understanding is, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, with a particular orientation structure and operation, therefore, cannot be understood as the limitation of the utility model.

[0023] Embodiment:

[0024] Please refer to Figures 1-6 The utility model provides a technical scheme:

[0025] A SHFS series large capacity low voltage reactive fast switching device, including stainless steel shell 1, the inside fixed resistance shunt thyristor subassembly 2 of stainless steel shell 1, PC protection device 3, control circuit PCB board 4 and over-temperature protection device 5, resistance shunt thyristor subassembly 2, PC protection device 3, control circuit PCB board 4 and over-temperature protection device 5 between each other electrically connected, the right side of stainless steel shell 1 is provided with power inlet hole 6, the front side upper end of stainless steel shell 1 is fixed with wiring panel 7, the upper side of stainless steel shell 1 is provided with switching indicator light 8, control circuit PCB board 4 includes trigger circuit and isolation circuit.

[0026] The electrical equipment in the device and stainless steel shell 1 adopt electrical insulation, reverse withstand voltage 1800V, adopt international standard package, adopt full pressure structure, excellent temperature characteristic and power cycle ability, have faster switching speed and shorter turn-off time, stable and reliable, small in size, light in weight, simple installation, convenient to use and maintain;

[0027] The function of trigger circuit in this module device:

[0028] Trigger loop is based on M0C3083 photoelectric coupling device and is composed of trigger electronic circuit, and has six pins (such as Figure 6), pin 1 and pin 2 are input terminals, which are anode and cathode of the light emitting diode respectively; pin 4 and pin 6 are output terminals, which are connected to low-voltage alternating current main circuit and controlled by three-terminal bidirectional thyristor switching element. When the trigger current between pin 1 and pin 2 is greater than 5mA, the internal light emitting diode is lighted, and then the zero-crossing detection module in MOC3083 detects the voltage between pin 4 and pin 6. If the voltage appears zero point, the bidirectional thyristor element is triggered, so that pin 4 and pin 6 change from off state to on state. When the current between pin 1 and pin 2 disappears, pin 4 and pin 6 change from on state to off state. In order to prevent high grid voltage, two MOC3083s are connected in series to drive together, but a resistor is connected in parallel to realize voltage equalization and prevent M0C3083 from burning out. When the external controller sends +12V signal to the circuit, the indicator light is lighted, and the internal light emitting diode in M0C3083 emits light of a certain wavelength. Then the bidirectional photosensitive thyristor receives the light signal, and when the zero-crossing detection circuit detects the zero-crossing signal, M0C3083 sends a gate signal to the bidirectional thyristor to turn on and put in.

[0029] The role of the protection circuit in the device is:

[0030] The RC resistance-capacitance circuit in the circuit, in which the resistance and the capacitance are connected in series and connected in parallel with the thyristor module, can play a role in anti-interference. The capacitance and the resistance are used to absorb overvoltage pulses, prevent mis-conduction caused by excessive voltage rise rate, and prevent overvoltage damage to the thyristor caused by oscillation. At the same time, the resistance can also limit the current to avoid overcurrent damage to the thyristor.

[0031] The role of the over-temperature protection in the device is:

[0032] The main body is composed of a large volume of aluminum heat sink and a five-leaf fan. When the operating temperature exceeds the set value, the fan is powered on to accelerate air flow and carry away the heat of the device to achieve the effect of cooling and ensure that the thyristor works within the specified temperature. When a component fails or the temperature output of the switching switch exceeds the upper limit due to some reason, the switching switch will automatically cut off to protect the switch from damage or further expansion of the fault.

[0033] The basic principle and main features of the present application and the advantages of the present application are shown and described above. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, and any reference signs in the claims should not be considered as limiting the claims involved.

[0034] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A SHFS series large-capacity low-voltage reactive quick switching device, comprising a stainless steel shell (1), characterized in that, The interior of the stainless steel shell (1) is fixed with an anti-parallel thyristor component (2), a PC protection device (3), a control circuit PCB board (4) and an over-temperature protection device (5), which are electrically connected with each other.

2. A SHFS series large-capacity low-voltage reactive power quick switching device according to claim 1, characterized in that: The right side of the stainless steel shell (1) is provided with a power inlet hole (6).

3. A SHFS series large-capacity low-voltage reactive power quick switching device according to claim 1, characterized in that: The front upper end of the stainless steel shell (1) is fixed with a wiring strip (7).

4. A SHFS series large capacity low voltage reactive power fast switching device according to claim 1, characterized in that: The upper side of the stainless steel shell (1) is provided with a switching indicating lamp (8).

5. A SHFS series large capacity low voltage reactive power fast switching device according to claim 1, characterized in that: The control circuit PCB board (4) comprises a trigger circuit and an isolation circuit.

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