Electrical fault monitoring system for three-phase intelligent power utilization protector

Abstract

The utility model discloses an electrical fault monitoring system for a three-phase intelligent power utilization protector. The electrical fault monitoring system comprises a main circuit, and a Hall current sensor, a discharge circuit, an IGBT switch group and a three-phase relay which are connected with the main circuit. The device further comprises a voltage and current detection module, a short circuit protection module and an MCU control unit, the voltage and current detection module is electrically connected with the main circuit and used for obtaining input current, input voltage and output voltage, the voltage and current detection module is further electrically connected with the IGBT switch group, and the input end of the short circuit protection module is electrically connected with the output end of the Hall current sensor. The MCU control unit is electrically connected with the voltage and current detection module and the short circuit protection module. According to the utility model, signals of voltage and current can be fed back, so that the system can judge the current state, and when a fault occurs, the IGBT switch group or the three-phase relay can be switched off, so that the stable and reliable operation of the power utilization protector can be ensured; and an ultrahigh voltage in a short-circuit fault can be released, so that the safety and the reliability can be improved.

Description

Technical Field

[0001] The utility model relates to the field of power protectors, in particular to an electrical fault monitoring system for a three-phase intelligent power protector. Background Art

[0002] A power protector is a device that provides power safety protection for electrical appliances. It has a built-in intelligent high-voltage protection device. When the appliance encounters an abnormal situation of instantaneous high voltage, it will intelligently start the internal protection device to ensure the power safety of the back-end electrical appliances. It can be divided into two categories: one is a household protector; the other is a mechanical protector. Choose the corresponding protector according to different needs.

[0003] However, existing power protectors are prone to current and voltage collection failures, which makes it impossible to accurately and timely feedback the failure to the control center, making the system prone to short circuits and non-operation; and existing power protectors cannot achieve leakage discharge or overvoltage discharge, which makes the system failure rate high and cannot ensure safe and reliable operation. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an electrical fault monitoring system for a three-phase intelligent power protector.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A three-phase intelligent power protector electrical fault monitoring system, comprising: a main circuit and a Hall current sensor, a discharge circuit, an IGBT switch group and a three-phase relay connected to the main circuit;

[0007] It also includes a voltage and current detection module, a short-circuit protection module and an MCU control unit. The voltage and current detection module is electrically connected to the main circuit and is used to obtain input current, input voltage and output voltage, and the voltage and current detection module is also electrically connected to the IGBT switch group. The input end of the short-circuit protection module is electrically connected to the output end of the Hall current sensor, and the MCU control unit is electrically connected to the voltage and current detection module and the short-circuit protection module respectively.

[0008] In one embodiment, the main circuit further includes a three-phase transformer, and the three-phase transformer is electrically connected to the Hall current sensor, the discharge circuit, and the IGBT switch group respectively, and the output end of the IGBT switch group is electrically connected to the three-phase relay.

[0009] In one embodiment, the discharge circuit includes a primary discharge branch and a secondary discharge branch, one end of the primary discharge branch is electrically connected to the main circuit, the other end of the primary discharge branch is grounded, one end of the secondary discharge branch is electrically connected to the main circuit, and the other end of the secondary discharge branch is connected to the neutral line.

[0010] In one embodiment, three primary discharge branches are provided, each of which is electrically connected to one phase of the three-phase power supply; each of the primary discharge branches includes a primary resistor and a primary discharge switch tube connected in series with the primary resistor, the other end of the primary resistor is electrically connected to one phase of the three-phase power supply, and the other end of the primary discharge switch tube is grounded.

[0011] In one embodiment, three secondary discharge branches are provided, each of which is electrically connected to one phase of a three-phase power supply; each of the secondary discharge branches includes a secondary resistor and a secondary discharge switch tube connected in series with the secondary resistor, the other end of the secondary resistor is electrically connected to one phase of the three-phase power supply, and the other end of the primary discharge switch tube is connected to the neutral line.

[0012] In one of the embodiments, a rapid leakage detection module is further included, wherein a detection end of the rapid leakage detection module is electrically connected to the main circuit, and an output end of the rapid leakage detection module is electrically connected to the MCU control unit.

[0013] In one of the embodiments, a switch driving unit is further included, wherein the switch driving unit is electrically connected to the short-circuit protection module, and an output end of the switch driving unit is electrically connected to the IGBT switch group.

[0014] In one of the embodiments, a relay driving circuit is further included, and the relay driving circuit is electrically connected to the three-phase relay and the MCU control unit respectively.

[0015] In one of the embodiments, it further includes a communication module, a display module, a temperature detection module, and a fan driving module, and the MCU control unit is electrically connected to the communication module, the display module, the temperature detection module, and the fan driving module respectively.

[0016] In one of the embodiments, it further comprises a current transformer, wherein the current transformer is electrically connected to the main circuit, and the current transformer is electrically connected to the voltage and current detection module.

[0017] The advantages and beneficial effects of the utility model compared with the prior art are as follows:

[0018] The utility model is a three-phase intelligent power protector electrical fault monitoring system. By setting a Hall current sensor, a voltage and current detection module, a short-circuit protection module, etc., the voltage and current signals can be fed back in time, so that the system can judge the current state in time. When a fault occurs, the IGBT switch group or the three-phase relay can be turned off in time to ensure the safety of the system, thereby ensuring that the power protector can operate stably and reliably; and by setting a discharge circuit, the ultra-high voltage in the short-circuit fault can be released, thereby further improving the safety and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a principle block diagram of an electrical fault monitoring system for a three-phase intelligent power protector according to an embodiment of the present utility model;

[0020] Figure 2 for Figure 1 The schematic diagram of the electrical fault monitoring system of the three-phase intelligent power protector is shown. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0022] See also Figure 1 , an electrical fault monitoring system for a three-phase intelligent power protector, comprising: a main circuit and a Hall current sensor, a discharge circuit, an IGBT switch group and a three-phase relay connected to the main circuit;

[0023] It also includes a voltage and current detection module, a short-circuit protection module and an MCU control unit. The voltage and current detection module is electrically connected to the main circuit and is used to obtain input current, input voltage and output voltage, and the voltage and current detection module is also electrically connected to the IGBT switch group. The input end of the short-circuit protection module is electrically connected to the output end of the Hall current sensor, and the MCU control unit is electrically connected to the voltage and current detection module and the short-circuit protection module respectively.

[0024] In this way, by setting up Hall current sensors, voltage and current detection modules, short-circuit protection modules, etc., voltage and current signals can be fed back in time, so that the system can judge the current state in time. When a fault occurs, the IGBT switch group or the three-phase relay can be turned off in time to ensure the safety of the system, thereby ensuring that the power protector can operate stably and reliably; and by setting up a discharge circuit, the ultra-high voltage in the short-circuit fault can be released, thereby further improving the safety and reliability of the system.

[0025] See also Figure 2 The main circuit further includes a three-phase transformer, which is electrically connected to the Hall current sensor, the discharge circuit, and the IGBT switch group, respectively, and the output end of the IGBT switch group is electrically connected to the three-phase relay. In this embodiment, the three-phase transformer is connected to the A phase, the B phase, the C phase, the N line, and the ground line (PE).

[0026] See also Figure 2 The discharge circuit includes a primary discharge branch and a secondary discharge branch, one end of the primary discharge branch is electrically connected to the main circuit, the other end of the primary discharge branch is grounded, one end of the secondary discharge branch is electrically connected to the main circuit, and the other end of the secondary discharge branch is connected to the neutral line.

[0027] Furthermore, three primary discharge branches are provided, each of which is electrically connected to one phase of the three-phase power supply; each of the primary discharge branches includes a primary resistor and a primary discharge switch tube connected in series with the primary resistor, the other end of the primary resistor is electrically connected to one phase of the three-phase power supply, and the other end of the primary discharge switch tube is grounded.

[0028] Furthermore, three secondary discharge branches are provided, each of which is electrically connected to one phase of the three-phase power supply; each of the secondary discharge branches includes a secondary resistor and a secondary discharge switch tube connected in series with the secondary resistor, the other end of the secondary resistor is electrically connected to one phase of the three-phase power supply, and the other end of the primary discharge switch tube is connected to the neutral line.

[0029] The electrical fault monitoring system of the three-phase intelligent power protector also includes a leakage rapid detection module, the detection end of the leakage rapid detection module is electrically connected to the main circuit, and the output end of the leakage rapid detection module is electrically connected to the MCU control unit. The electrical fault monitoring system of the three-phase intelligent power protector also includes a switch drive unit, the switch drive unit is electrically connected to the short-circuit protection module, and the output end of the switch drive unit is electrically connected to the IGBT switch group. The leakage rapid detection module amplifies, filters, and compares the signal, and then outputs a feedback signal IL_fign. If IL_fign is a high level, it indicates that there is a leakage signal. The MCU control unit uses the external interrupt mode to capture the IL_fign signal, and immediately gives the MCU_TO_IGBT signal after capturing the signal, so that it drives the IGBT or MOSETF drive-3L to turn off the IGBT or MOSETF. Using the fast shutdown capability of IGBT or MOSETF, the leakage can be quickly shut down, and the shutdown time must be less than 1MS. Compared with the traditional leakage protection switch which has a speed of 100MS, this method increases the speed by more than 100 times. The MCU displays the short-circuit alarm information on the display screen through the received signal, and sends it to the PC and mobile phone through the communication module.

[0030] The electrical fault monitoring system of the three-phase smart power protector also includes a relay drive circuit, and the relay drive circuit is electrically connected to the three-phase relay and the MCU control unit respectively. The electrical fault monitoring system of the three-phase smart power protector also includes a current transformer, and the current transformer is electrically connected to the main circuit, and the current transformer is electrically connected to the voltage and current detection module. The electrical fault monitoring system of the three-phase smart power protector also includes a communication module, a display module, a temperature detection module, and a fan drive module, and the MCU control unit is electrically connected to the communication module, the display module, the temperature detection module, and the fan drive module respectively.

[0031] It should be noted that by setting up the voltage and current detection module, warnings such as phase loss, input voltage too high, input voltage too low, etc. can be displayed on the display screen, and the information can be sent to the PC and mobile phone through the communication module. The input voltage is determined by judging whether the input voltage has phase loss, undervoltage, overvoltage, etc. If the phase is missing, one phase will be unable to supply power. If the back-end is connected to a three-phase load, the three-phase equipment will be damaged. If the input voltage is too high, the internal components of the RZ-A, RZ-B, and RZ-C load terminals will be damaged. If the input voltage is too low, the RZ-A, RZ-B, and RZ-C load terminal devices will not operate normally.

[0032] When the voltage and current detection module detects that the IGBT or MOSFET tube is damaged, the fault information can be displayed on the display screen and sent to the PC and mobile phone through the communication module. By judging the output voltage of the IGBT or MOSFET tube, it can be judged whether it is damaged and the equipment fault point can be found in time. If one or more phases have IGBT or MOSFET tubes, it will cause power failure. If the back-end is connected to a three-phase load, it will cause equipment damage.

[0033] The short-circuit protection module collects the Hall current sensor signals of U3, U4, and U5. At the same time, the voltage and current detection module collects the current signals of the current transformers H2, H3, and H4. Both channels collect current signals. One channel uses the MCU control unit to collect current data, processes the read data, and then drives the IGBT or MOSFET tube. The other channel directly collects and processes the data and then drives the IGBT or MOSFET tube directly. The two-channel collection improves the anti-interference ability of the circuit, prevents false operation, and prevents the MCU from crashing and short-circuiting and damaging the IGBT or MOSFET tube.

[0034] The above-mentioned embodiments only express several embodiments of the present utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present utility model, which all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be based on the attached claims.

Claims

1. A three-phase intelligent power protector electrical fault monitoring system, characterized in that: include: A main circuit and a Hall current sensor, a discharge circuit, an IGBT switch group and a three-phase relay connected to the main circuit; It also includes a voltage and current detection module, a short-circuit protection module and an MCU control unit. The voltage and current detection module is electrically connected to the main circuit and is used to obtain input current, input voltage and output voltage, and the voltage and current detection module is also electrically connected to the IGBT switch group. The input end of the short-circuit protection module is electrically connected to the output end of the Hall current sensor, and the MCU control unit is electrically connected to the voltage and current detection module and the short-circuit protection module respectively.

2. The electrical fault monitoring system for a three-phase intelligent power protector according to claim 1 is characterized in that: The main circuit further includes a three-phase transformer, which is electrically connected to the Hall current sensor, the discharge circuit, and the IGBT switch group respectively, and the output end of the IGBT switch group is electrically connected to the three-phase relay.

3. The electrical fault monitoring system for a three-phase intelligent power protector according to claim 1 or 2, characterized in that: The discharge circuit includes a primary discharge branch and a secondary discharge branch, one end of the primary discharge branch is electrically connected to the main circuit, the other end of the primary discharge branch is grounded, one end of the secondary discharge branch is electrically connected to the main circuit, and the other end of the secondary discharge branch is connected to the neutral line.

4. The three-phase intelligent power protector electrical fault monitoring system according to claim 3 is characterized in that: The first-level discharge branch is provided with three paths, each of which is electrically connected to one phase of the three-phase power supply; each of the first-level discharge branches includes a first-level resistor and a first-level discharge switch tube connected in series with the first-level resistor, the other end of the first-level resistor is electrically connected to one phase of the three-phase power supply, and the other end of the first-level discharge switch tube is grounded.

5. The three-phase intelligent power protector electrical fault monitoring system according to claim 3 is characterized in that: The secondary discharge branch is provided with three paths, each of which is electrically connected to one phase of the three-phase power supply; each of the secondary discharge branches includes a secondary resistor and a secondary discharge switch tube connected in series with the secondary resistor, the other end of the secondary resistor is electrically connected to one phase of the three-phase power supply, and the other end of the primary discharge switch tube is connected to the neutral line.

6. The three-phase intelligent power protector electrical fault monitoring system according to claim 1 is characterized in that: It also includes a rapid leakage detection module, a detection end of the rapid leakage detection module is electrically connected to the main circuit, and an output end of the rapid leakage detection module is electrically connected to the MCU control unit.

7. The three-phase intelligent power protector electrical fault monitoring system according to claim 1 is characterized in that: It also includes a switch driving unit, which is electrically connected to the short-circuit protection module, and an output end of the switch driving unit is electrically connected to the IGBT switch group.

8. The three-phase intelligent power protector electrical fault monitoring system according to claim 1 is characterized in that: It also includes a relay drive circuit, which is electrically connected to the three-phase relay and the MCU control unit respectively.

9. The three-phase intelligent power protector electrical fault monitoring system according to claim 1 is characterized in that: It also includes a communication module, a display module, a temperature detection module, and a fan driving module. The MCU control unit is electrically connected to the communication module, the display module, the temperature detection module, and the fan driving module respectively.

10. The three-phase intelligent power protector electrical fault monitoring system according to claim 1, characterized in that: It also includes a current transformer, which is electrically connected to the main circuit and the voltage and current detection module.

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