Overload alarm system

Abstract

The utility model discloses an overload alarm system, and belongs to the field of electrical safety. The overload alarm system comprises a power supply, an overload detection device, an alarm device and a load, the overload detection device is connected to a wire harness, supplying power to the load, of the power supply, the overload detection device is connected with the alarm device, and the overload detection device comprises an overcurrent detection device. According to the utility model, while overload real-time monitoring is realized, various effective and timely alarm devices are provided, so that field personnel and power supply personnel can receive alarms in time, the overall structure is simple, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of electric safety, specifically, the utility model relates to an overload alarm system. BACKGROUND

[0002] At present, the majority of the overload protection commonly used in various industrial and mining enterprises are microcomputer protections, and the overload alarm thereof can only display an "overload" alarm information on the protection screen, and there is no corresponding information notification or alarm bell sound alarm device. At the same time, most of the user substations and power distribution rooms are unattended, and when the user transformer is used in excess of capacity, the electrician and the user cannot timely perceive. Even worse, some 10kV factory high-voltage devices are old, and only have fuse protection, and there is no related sound alarm device to attract the attention of the electrician, and the transformer will be in the state of over-capacity use.

[0003] For example, the contrast file (CN118713010A) is a digital thermal protection device and protection method of an alternating current motor, each phase power line is connected with a voltage transformer and a current transformer, the voltage and current of three-phase power supply are provided to an electric energy metering chip through a corresponding sampling processing circuit, and real-time collected three-phase voltage, current, power, phase sequence and unbalance rate data are provided to the connected MCU, and the MCU judges the motor working state according to the program setting to drive the circuit control to realize the control of the motor.

[0004] The above-mentioned contrast file is the same as the existing various industrial and mining enterprises, which only monitors the load and does not provide a suitable alarm mode to ensure that the user can receive the information in time. At the same time, the existing overload alarm mode is relatively single. Therefore, the present application provides an overload alarm system. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of the prior art, and provides an overload alarm system to achieve the following purposes. While monitoring the overload in real time, a variety of effective and timely alarm devices are provided, so that the on-site personnel and power supply personnel can receive the alarm in time, and the overall structure is simple and the cost is reduced.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows: an overload alarm system, the system comprises a power supply, an overload detection device, an alarm device and a load, the power supply is connected with the overload detection device on the wire harness for supplying power to the load, and the overload detection device is connected with the alarm device, wherein the overload detection device comprises an overcurrent detection device.

[0007] Preferably, the overcurrent detection device comprises a microcomputer protection device and a current transformer, wherein the microcomputer protection device is connected with the secondary side of the current transformer; and the primary side of the current transformer is connected on the wire harness through which the power supply supplies power to the load.

[0008] Preferably, the alarm device comprises a wired alarm device and a wireless alarm device, wherein the wired alarm device is connected with the primary side of the current transformer; and the wireless alarm device is connected with the microcomputer protection device.

[0009] Preferably, the wired alarm device comprises a normally open current relay and an audible and visual alarm device, wherein the normally open current relay is connected between the primary side of the current transformer and the audible and visual alarm device.

[0010] Preferably, the normally open current relay is connected with the audible and visual alarm device through an AC 220V cable.

[0011] Preferably, the audible and visual alarm device comprises a warning bell.

[0012] Preferably, the wireless alarm device comprises a wireless communication unit, a cloud platform and a user terminal device, wherein the microcomputer protection device communicates with the cloud platform through the wireless communication unit; and the cloud platform communicates with the user terminal device.

[0013] Preferably, the power supply also supplies power to the microcomputer protection device.

[0014] The technical effects of the utility model are as follows: (1) the application realizes real-time monitoring of load overload, provides two kinds of alarm modes of wired and wireless, wherein the wired alarm mode can more intuitively issue an alarm and notify on-site staff; the wireless alarm mode can further notify the relevant person in charge of the enterprise and the relevant person in charge of the power supply company while notifying the on-site staff, can know whether the user has occurred overcapacity in time, and thus can be processed in time, guaranteeing the safe operation and quality of the power grid. (2) the overload detection of the application selects an overcurrent detection device, the detection mode is relatively simple, only needs to detect the overcurrent generated by the abnormal load, is different from overvoltage detection, and simplifies the system structure and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure diagram of an overload alarm system of the utility model embodiment. DETAILED DESCRIPTION

[0016] The specific embodiments of the utility model are further explained in detail below by describing the embodiments with reference to the drawings, the purpose of which is to help the technicians in the field have a more complete, accurate and in-depth understanding of the utility model concept and technical scheme of the utility model and help them implement the utility model. In order to make the technical scheme of the utility model clearer, the utility model is explained and described by the following embodiments.

[0017] The embodiment provides an overload alarm system, as shown in the figure, the system comprises a power supply, an overload detection device, an alarm device and a load, the overload detection device is connected on the wire harness that the power supply supplies power for the load, the overload detection device is connected with the alarm device, wherein the overload detection device comprises an overcurrent detection device. Figure 1

[0018] Preferably, the overcurrent detection device comprises a microcomputer protection device and a current transformer, wherein the microcomputer protection device is connected with the secondary side of the current transformer; the primary side of the current transformer is connected on the wire harness that the power supply supplies power for the load.

[0019] The microcomputer protection device is a relay protection device composed of a microcomputer, which is the development direction of relay protection of power systems. It has high reliability, high selectivity and high sensitivity, and is mainly used for the protection of 35KV and below medium and high voltage power equipment. The microcomputer protection device is usually composed of a data acquisition system, a microcomputer system and an input / output system, responsible for detecting circuit data and providing a man-machine interface for users, while supporting communication with external devices.

[0020] The main function of the current transformer is to convert high current into lower proportional current for measurement, monitoring and protection of electrical equipment.

[0021] In the embodiment, the current on the wire harness that the power supply supplies power for the load flows into the microcomputer protection device after passing through the current transformer, and the microcomputer protection device collects and analog-to-digital converts the current and compares it with the preset current threshold to determine whether the current is overcurrent. In the embodiment, the power supply also supplies power for the microcomputer protection device.

[0022] In the embodiment, the overload detection device uses overcurrent detection device because its detection method is relatively simple, only needs to detect the overcurrent generated by the abnormal load, simplifies the system structure and reduces the cost. Overvoltage detection requires higher accuracy and stability of the device, and the cost is also relatively high. In other embodiments of the application, overvoltage detection device can also be selected according to actual conditions.

[0023] ​In the embodiment, the alarm device includes a wired alarm device and a wireless alarm device, the wired alarm device is connected with the primary side of the current transformer, and the wireless alarm device is connected with the microcomputer protection device. The wired alarm device can more directly send an alarm to the on-site staff, and the wireless alarm device can further send an alarm to the relevant person in charge of the enterprise and the relevant person in charge of the power supply company while sending an alarm to the on-site staff, so that it can be known in time whether the user has an overload situation such as overcapacity, and thus timely treatment can be achieved to ensure the safe operation and quality of the power grid.

[0024] Specifically, the wired alarm device of the embodiment includes a normally open current relay and an audible and visual alarm device, and the normally open current relay is connected between the primary side of the current transformer and the audible and visual alarm device. When the factory is overloaded, overcurrent will be generated on the wire harness for power supply of the load, and the current is transmitted to the normally open current relay through the current transformer, at this time, the normally open current relay is closed to turn on the audible and visual alarm device, so as to realize rapid response to overload. The audible and visual alarm device is usually installed in an industrial site (such as a duty room or the like), and after being turned on, it reminds the on-site staff that the device is overloaded.

[0025] In order to avoid that long line causes current attenuation and measurement error, the normally open current relay and the audible and visual alarm device can be connected through an AC 220V cable. When AC power is transmitted through the cable, the current and voltage thereof are periodically changed. Due to the continuous change of the direction and amplitude of the current, the AC power can reduce the current attenuation in the cable to a certain extent. The audible and visual alarm device in the embodiment includes a warning bell, which has the advantage of loud sound. In specific implementation, other audible and visual alarm devices can also be flexibly selected according to actual conditions, such as a buzzer, an alarm lamp, etc.

[0026] In the embodiment, the wireless alarm device includes a wireless communication unit, a cloud platform and a user terminal device, the microcomputer protection device communicates with the cloud platform through the wireless communication unit, and the cloud platform communicates with the user terminal device. The wireless communication unit can establish communication between the microcomputer protection device and the cloud platform through wireless communication technologies such as 4G network, TCP / IP, GSM, etc., and has the advantage of fast transmission speed, so that rapid alarm can be realized when overload occurs. When the microcomputer protection device detects overcurrent, the wireless communication unit can send overcurrent information and an alarm signal to the cloud platform, and the cloud platform forwards the corresponding overcurrent information and alarm signal to the user terminal device, so as to realize rapid alarm to the user. The user terminal device includes a smart phone, a tablet computer, a computer, etc.

[0027] The embodiment has simple structure and small volume, and when being implemented, the over-load detection device, the wireless alarm device, the wired alarm device and other components can be welded and fixed in the shell of the power distribution cabinet, so as to form protection for the components. The embodiment realizes that when over-load power consumption occurs, on-site personnel or power supply personnel can receive alarm information in time, so that the load is reduced in time, long-term over-capacity use of user equipment is avoided, safe operation of the power line is ensured, and the safety management level is improved.

[0028] The utility model is described above with reference to the drawings. Obviously, the utility model is not limited by the above-mentioned mode. As long as various non-essential improvements are made by using the method concept and technical scheme of the utility model; or the above-mentioned concept and technical scheme of the utility model are directly applied to other occasions without improvement, all of which are within the protection scope of the utility model.

Claims

1. An overload alarm system, characterized by: The system comprises a power supply, an overload detection device, an alarm device, and a load, the overload detection device is connected to a wire harness through which the power supply supplies power to the load, the overload detection device is connected to the alarm device, wherein the overload detection device comprises an overcurrent detection device.

2. An overload alarm system according to claim 1, characterised in that: The overcurrent detection device comprises a microcomputer protection device and a current transformer, wherein the microcomputer protection device is connected to the secondary side of the current transformer; the primary side of the current transformer is connected to the wire harness through which the power supply supplies power to the load.

3. An overload alarm system according to claim 2, wherein: The alarm device comprises a wired alarm device and a wireless alarm device, the wired alarm device is connected to the primary side of the current transformer; the wireless alarm device is connected to the microcomputer protection device.

4. An overload alarm system according to claim 3, characterised in that: The wired alarm device comprises a normally open current relay and an audible and visual alarm device, the normally open current relay is connected between the primary side of the current transformer and the audible and visual alarm device.

5. An overload alarm system according to claim 4, characterised in that: The normally open current relay and the audible and visual alarm device are connected through an AC 220V cable.

6. An overload alarm system according to claim 4, wherein: The audible and visual alarm device comprises a warning bell.

7. An overload alarm system according to claim 3, wherein: The wireless alarm device comprises a wireless communication unit, a cloud platform, and a user terminal device, the microcomputer protection device communicates with the cloud platform through the wireless communication unit; the cloud platform communicates with the user terminal device.

8. An overload alarm system according to claim 2, wherein: The power supply also supplies power to the microcomputer protection device.

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