Power system protection device

Abstract

The utility model discloses an electric power system protection device, and relates to the technical field of electric power system protection. Comprising a switching power supply, a main control circuit board, a key small lamp display circuit board, a switching value output circuit board, an interface circuit board, a case shell, a current transformer, a voltage transformer, a frequency sensor and an upper computer, and the switching power supply, the main control circuit board, the key small lamp display circuit board, the switching value output circuit board and the interface circuit board are all arranged in the case shell. The current transformer, the voltage transformer, the frequency sensor and the upper computer are connected with the master control circuit board through interfaces of the interface circuit board. According to the device, integration of multiple modules can be realized, the internal installation space of the shell of the protection device is effectively utilized, and the problem that the size of the protection device is too large is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to power system protection technical field, especially a kind of power system protection device. BACKGROUND

[0002] Power grid relay protection device is the vital safety facility in power system, they can act quickly when detecting abnormal or fault, prevent the further expansion of accident.

[0003] The existing protection device can realize the above-mentioned function, but the existing protection device, module is simple, only can realize the collection of single circuit operation data, such as the portable relay protection device disclosed in patent CN206022230U, only provided with ammeter to carry out data collection, cannot satisfy the accuracy requirement of power system fault judgment, but the increase of data acquisition module of protection device means that the internal connection line of device needs to be increased correspondingly, finally the problem that the volume of protection device needs to be enlarged to place circuit board arrangement wiring caused by the complex internal circuit board wiring connection of device occurs.Therefore, how to provide a kind of power system protection device which can realize multiple data acquisition functions while ensuring that the volume of device is not too large is a problem that the person skilled in the art needs to solve urgently. SUMMARY

[0004] The utility model aims at providing a kind of power system protection device, the device can realize the integration of multifunction module, solve the problem of large size and complex operation of power protection system.

[0005] In order to realize the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A kind of power system protection device, comprising: switching power supply, main control circuit board, key small light display circuit board, on-off output circuit board, interface circuit board, case shell, current transformer, voltage transformer, frequency sensor, host computer, the case shell is composed of main shell, front panel, shell top cover and rear panel, wherein the key small light display circuit board is installed in the inside of front panel, the interface circuit board is installed in the inside of rear panel, the main control circuit board, on-off output circuit board, switching power supply are installed in main shell, the key small light display circuit board is connected to main control circuit board by wiring, the main control circuit board is connected to on-off output circuit board, interface circuit board by wiring, the on-off output circuit board is connected to interface circuit board by wiring, the current transformer, voltage transformer, frequency sensor, host computer are connected to interface circuit board.

[0007] In some embodiments, the switching power supply is the power supply unit of the entire device, connected to 220V AC power, outputs 24V DC voltage, and the 24V DC voltage is connected to the main control circuit board through the terminal.

[0008] Some embodiments, the front panel outside is equipped with state indicator light, button, display screen, channel indicator light.

[0009] Some embodiments, the channel indicator light, state indicator light, button and display screen are welded on the button small light display circuit board.

[0010] Some embodiments, the main control circuit board is equipped with DC / DC voltage stabilizing module.

[0011] Some embodiments, the main control circuit board comprises main control circuit, communication circuit, data acquisition circuit and data processing circuit.

[0012] Some embodiments, the rear panel outside is equipped with power supply interface, communication interface, external alarm fault output interface and sensor input interface.

[0013] Some embodiments, the interface circuit board comprises communication interface, relay output interface, alarm output interface and sensor input interface.

[0014] Some embodiments, the switching quantity output circuit board comprises relay drive circuit and alarm drive circuit.

[0015] Some embodiments, the switching power supply is located at the back of the main control circuit board and the switching quantity output circuit board, and the switching power supply is separated from the main control circuit board and the switching quantity output circuit board by a baffle.

[0016] The utility model discloses a power system protection device, which has the advantages of the following.

[0017] The utility model discloses a power system protection device, which has the advantages of the following. The utility model discloses a power system protection device, which has the advantages of the following.

[0018] Figure 1 It is the front panel part structure schematic drawing of power system protection device in the utility model embodiment.

[0019] Figure 2The utility model discloses a back panel part structure schematic diagram of power system protection device.

[0020] Figure 3 The utility model discloses an internal circuit board layout schematic diagram of power system protection device.

[0021] Figure 4 The utility model discloses an internal switch power supply layout schematic diagram of power system protection device.

[0022] Figure 5 The utility model discloses a circuit board connection schematic diagram.

[0023] Figure 6 The utility model discloses a passageway indicating lamp circuit.

[0024] Figure 7 The utility model discloses a state indicating lamp circuit.

[0025] Figure 8 The utility model discloses a relay drive circuit.

[0026] Figure 9 The utility model discloses a RS485 bus communication circuit.

[0027] In the drawing, 1, front panel, 2, main casing, 3, switch quantity output circuit board, 4, interface circuit board, 5, shell top cover, 6, main control circuit board, 7, button small light display circuit board, 8, back panel, 9, baffle, 10, switch power supply. DETAILED DESCRIPTION

[0028] The specific implementation of the utility model is described in detail below in combination with the drawings.

[0029] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as understood by ordinary skilled persons in the technical field to which the utility model belongs.

[0030] It should be noted that the terms used herein are only for describing the specific implementation, and are not intended to limit the exemplary implementation according to the utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations exist.

[0031] In this utility model, terms such as "upper", "lower", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0032] In this utility model, terms such as "connection" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of the above terms in this utility model based on the specific circumstances, and they should not be construed as limitations on this utility model.

[0033] Where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0034] The device mainly includes a switching power supply 10, a main control circuit board 6, a keypad indicator circuit board 7, a switch output circuit board 3, an interface circuit board 4, a chassis, a current transformer, a voltage transformer, a frequency sensor, and a host computer. Figure 5 As shown, the button indicator circuit board 7 is connected to the main control circuit board 6 via a ribbon cable. The main control circuit board 6 is connected to the switch output circuit board 3 and the interface circuit board 4 via ribbon cables. The switch output circuit board 3 and the interface circuit board 4 are also connected via ribbon cables. The current transformer, voltage transformer, frequency sensor, and host computer are externally connected to the interface circuit board 4.

[0035] like Figure 1 As shown, the chassis consists of a main shell 2, a front panel 1, a top cover 5, and a rear panel 8. The front panel 1 has channel indicator lights, status indicator lights, buttons, and a display screen. The back of the front panel 1 houses a button indicator light circuit board 7, which connects to the main control circuit board 6 via a ribbon cable. The buttons, channel indicator lights, status indicator lights, and display screen are directly soldered to the button indicator light circuit board 7, achieving electrical connection between the components and the circuit board. Screws are used to further secure the components to the circuit board. Figure 6 As shown, there are 8 channel indicator lights, consisting of resistors and LEDs connected in series. Figure 7 As shown, there are four status indicator lights, which are also composed of resistors and LEDs connected in series.

[0036] like Figure 2 As shown, one side of the rear panel 8 contains the power interface, communication interface, external alarm / fault output interface, and sensor input interface, such as... Figure 3The other side of the rear panel shown is the interface circuit board 4. Interface circuit board 4 includes a communication interface, a relay output interface, an alarm output interface, and a sensor input interface. The communication interface mainly includes an RS485 bus interface and a CAN bus interface, serving as the channel connecting the device components to the host computer. The relay output interface includes alarm relay outputs and fault relay outputs. The sensors are mainly external current transformers, voltage transformers, and frequency sensors used to detect parameters in the power system. The alarm output interface can be connected to an external audible and visual alarm. When power parameters exceed specified limits, the alarm interface outputs a signal to trigger an audible and visual alarm, achieving effective monitoring of the power grid and timely alarm reminders.

[0037] Figure 3 The switch output circuit board 3 includes a relay drive circuit and an alarm drive circuit, such as... Figure 8 As shown, the relay drive circuit is mainly driven by an NPN transistor, which increases the drive current. The alarm drive circuit has the same structure as the relay drive circuit. The input terminals of the alarm drive circuit and the relay drive circuit are connected to the main control circuit of the main control circuit board 6 to receive drive signals from the main control circuit. The output terminals of the alarm drive circuit and the relay drive circuit are respectively connected to the alarm output interface and the relay output interface of the interface circuit board 4.

[0038] Figure 3 The main control circuit board is divided into six parts: main control circuit, communication circuit, data acquisition circuit, and data processing circuit. These circuits are functionally controlled by the main control chip. The communication circuit includes both CAN bus and RS485 bus communication circuits. For example... Figure 9 As shown, the RS485 bus communication circuit consists of a RS485 chip with strong anti-interference capabilities and peripheral circuits. Figure 9 The U15 chip is a 485 chip with internal isolation and lightning protection. The RS485 bus communication circuit includes two 485 interfaces. The optocouplers used in the circuit are a 6N137 high-speed optocoupler and a TPL521-1 optocoupler. The input of the communication circuit connects to the main control circuit of the main control circuit board 6, and the output connects to the communication interface of the interface circuit board 4. The data acquisition circuit filters and denoises the acquired data to eliminate interference signals and extracts valid information for the main control circuit. The main function of the data processing circuit is signal conversion, converting analog signals to digital signals, and then converting digital signals into current, voltage, and frequency signals for the main control circuit. The main control circuit judges power system faults or abnormalities based on electrical parameter information and records, stores, evaluates, and communicates alarms for these faults or abnormalities.

[0039] The current transformer and the voltage transformer are key devices for measuring current and voltage in the power system. The current transformer measures the current by surrounding the measured large current, while the voltage transformer is used to measure the voltage. The frequency sensor is used to monitor the frequency change of the power grid, which is crucial for the stability of the power grid and fault diagnosis. The current transformer, voltage transformer and frequency sensor are connected with the main control circuit board 6 through the interface circuit board 4, and the measured data is transmitted to the system for analysis; the upper computer collects and processes the data from the main control circuit board 6 through the RS485 bus, executes the algorithm of fault diagnosis and accident cause judgment, and can communicate with other systems such as the dispatching center to realize remote monitoring and data sharing. Those skilled in the art can understand that the above-mentioned fault diagnosis and accident cause judgment can adopt the existing method, which is not limited here, and this part of the algorithm is not within the protection scope required by the present application.

[0040] Figure 4 The switch power supply 10 is externally connected with 220V alternating current for power consumption, and outputs 24V direct current voltage to provide 24V direct current voltage for the whole device. The switch power supply 10 is placed in the case shell, in order to save space, the switch power supply 10 is located at the back of the main control circuit board 6 and the on-off quantity output circuit board 3, and is separated by the baffle 9.

[0041] Thanks to the teaching of the present application, those skilled in the art can easily recognize that the alternative structure of the structure disclosed in the present application can be used as a feasible alternative embodiment, and the embodiments disclosed in the present application can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. An electric power system protection device, characterized by, It includes: Switching power supply, master control circuit board, key small light display circuit board, switch output circuit board, interface circuit board, case shell, current transformer, voltage transformer, frequency sensor, host computer, the case shell is composed of main shell, front panel, shell top cover and rear panel, wherein the key small light display circuit board is installed inside the front panel, the interface circuit board is installed inside the rear panel, the master control circuit board, switch output circuit board and switching power supply are installed in the main shell, the key small light display circuit board is connected to the master control circuit board through the wire, the master control circuit board is connected to the switch output circuit board and the interface circuit board through the wire, the switch output circuit board is connected to the interface circuit board through the wire, and the current transformer, voltage transformer, frequency sensor and host computer are connected to the interface circuit board.

2. The power system protection apparatus of claim 1, wherein, The switching power supply is the power supply unit of the whole device, which is connected to 220V AC power and outputs 24V DC voltage, and the 24V DC voltage is connected to the master control circuit board through the terminal.

3. The power system protection apparatus of claim 1, wherein, The front panel is provided with channel indicator light, state indicator light, key and display screen on the outside.

4. The power system protection apparatus of claim 3, wherein, The channel indicator light, state indicator light, key and display screen are welded on the key small light display circuit board.

5. The power system protection apparatus of claim 1, wherein, The master control circuit board is provided with DC / DC voltage stabilizing module.

6. The power system protection apparatus of claim 1, wherein, The master control circuit board includes master control circuit, communication circuit, data acquisition circuit and data processing circuit.

7. The power system protection apparatus of claim 1, wherein, The rear panel is provided with power supply interface, communication interface, external alarm fault output interface and sensor input interface on the outside.

8. The power system protection apparatus of claim 1, wherein, The interface circuit board includes communication interface, relay output interface, alarm output interface and sensor input interface.

9. The power system protection apparatus of claim 1, wherein, The switch output circuit board includes relay drive circuit and alarm drive circuit.

10. The power system protection apparatus of claim 1, wherein, The switching power supply is located at the back of the master control circuit board and the switch output circuit board, and is separated from the master control circuit board and the switch output circuit board by the baffle.

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