CN218958623U

CN218958623U - Power microcomputer monitoring fault disconnection device

Info

Publication number: CN218958623U
Application number: CN202222019980.2U
Authority: CN
Inventors: 李寅生; 王丰年
Original assignee: Nanjing Ruidian Automation Technology Co ltd
Current assignee: Nanjing Ruidian Automation Technology Co ltd
Priority date: 2022-08-02
Filing date: 2022-08-02
Publication date: 2023-05-02
Anticipated expiration: 2032-08-02

Abstract

The utility model discloses an electric microcomputer monitoring fault splitting device which comprises a low-pass filter, wherein the input end of the low-pass filter is electrically connected with a voltage transformer and a current transformer, the output end of the low-pass filter is electrically connected with the input end of an analog-to-digital converter, the output end of the analog-to-digital converter is electrically connected with a CPU (central processing unit), the CPU is electrically connected with an outlet relay, the outlet relay is electrically connected with and controls the on-off of an electric switch, the outlet relay is electrically connected with an alarm control relay, and the alarm control relay is electrically connected with an alarm. The microcomputer monitoring fault disconnection device for the electric power is characterized in that the alarm control relay is connected to the outlet relay, the alarm control relay works while the alarm control relay controls the on-off of the electric switch control circuit, so that the alarm device alarms, the alarm is rapid, and the rapid maintenance and the rescue of workers are facilitated.

Description

Power microcomputer monitoring fault disconnection device

Technical Field

The utility model belongs to the technical field of fault disconnection devices, and particularly relates to an electric microcomputer monitoring fault disconnection device.

Background

The electric microcomputer monitoring is used for carrying out centralized monitoring on electric parameters such as voltage, current, active power, reactive power, electric measurement, frequency, power factor, transformer temperature, states of a knife switch, a breaker and a grounding knife switch of each path of inlet and outlet wire of the substation, and once monitoring abnormality occurs, the knife switch, the breaker and a fault disconnection device of each path of inlet and outlet wire are required to work, so that fault influence is reduced, and the fault disconnection device is generally applied more in areas with more hydropower and new energy power generation.

The power grid and the power supply are not coordinated, the grid structure is weak, the power grid damping is weak, the fault removal is slow, the static stability limit is insufficient, the large-capacity load impact, the main protection non-synchronous closing and the like are easy to generate out-of-step oscillation, so that the power grid is broken down and is often needed to be used; in order to avoid the fault of the power supply of the self-station affecting the power grid, the grid-connected switch is quickly and reliably disconnected, the power supply of the self-station is separated from the power grid, unnecessary impact on the power grid is avoided, and a fault disconnection device is often used for separating the power supply of the self-station from the power grid, however, the existing fault disconnection device has single function and cannot quickly alarm when the fault occurs.

Disclosure of Invention

The utility model aims to provide an electric microcomputer monitoring fault disconnection device which is used for solving the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides an electric power microcomputer monitoring fault separation device, includes low pass filter, voltage transformer and current transformer are connected to low pass filter's input electricity, the input of analog-to-digital converter is connected to low pass filter's output electricity, CPU is connected to analog-to-digital converter's output electricity, the export relay is connected to CPU electricity, the break-make of electric switch is connected and is controlled to export relay electricity, the alarm control relay is connected to export relay electricity, alarm control relay electricity is connected.

Preferably, the CPU is further electrically connected with the RAM and the EPROM, the RAM and the EPROM are electrically connected with the alarm, the CPU is further used for detecting whether the fixed values of the RAM and the EPROM are wrong or not, if so, a fault alarm signal is sent to the alarm, and locking operation is executed.

Preferably, the CPU is further electrically connected to the display screen and the keyboard.

Preferably, the CPU is further electrically connected to a serial interface, and is configured to connect to an expansion plug-in unit that conforms to the serial interface.

Preferably, the input end of the low-pass filter is further electrically connected with the test module.

Preferably, the test module is configured as a short-circuit fault simulation device for simulating the generation of a short-circuit fault.

Preferably, the CPU uses a 80196 single-chip microcomputer.

The utility model has the technical effects and advantages that: the microcomputer monitoring fault disconnection device for the electric power is characterized in that the alarm control relay is connected to the outlet relay, the alarm control relay works while the alarm control relay controls the on-off of the electric switch control circuit, so that the alarm device alarms, the alarm is rapid, and the rapid maintenance and the rescue of workers are facilitated.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present utility model, but is not intended to limit the present utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

The utility model provides an electric microcomputer monitoring fault disconnection device shown in fig. 1, which comprises a low-pass filter, wherein the input end of the low-pass filter is electrically connected with a voltage transformer and a current transformer, the voltage transformer is an isolated voltage transformer, the current transformer is an isolated current transformer, and the safety coefficient is higher; the power supply system comprises an Ia joint, an Ia1 joint, an Ib1 joint, an Ic joint and an Ic1 joint of a plurality of current transformers, wherein the Ia joint, the Ib1 joint, the Ic joint and the Ic1 joint of the current transformers are connected with external current, the UA joint, the UB joint and the UC joint of the voltage transformers are connected with bus voltage, the output end of the low-pass filter is electrically connected with the input end of an analog-to-digital converter, the output end of the analog-to-digital converter is electrically connected with a CPU (central processing unit) by adopting a 80196 singlechip, the CPU is electrically connected with an outlet relay, the external current and the voltage are input to the analog-to-digital converter after being converted by the voltage transformers and the current transformers, the CPU is input to the analog-to-digital converter after being subjected to analog-digital conversion, the CPU is subjected to sampling digital processing and outputs signals to an outlet relay, the outlet relay is electrically connected with and controls the on-off of an electric switch, the outlet relay receives signals, the outlet relay is conducted to work, and the electric switch is driven to work, and the electric switch is disconnected from a power supply or other power supply, so that the fault power supply is prevented from affecting the whole power supply or other power supply;

the outlet relay is electrically connected with the alarm control relay, and the alarm control relay is electrically connected with the alarm; the outlet relay works, so that an alarm control relay circuit is connected, and the alarm works, so that the fault power supply and other power supplies or power grids are disconnected and simultaneously alarm is carried out, a worker can know the fault position at the first time, and the follow-up rescue maintenance is convenient.

The CPU is also electrically connected with the RAM and the EPROM, the RAM and the EPROM are electrically connected with the alarm, the CPU is also used for detecting whether the fixed values of the RAM and the EPROM are wrong, if so, a fault alarm signal is sent to the alarm, locking operation is carried out, misoperation caused by damage of internal electronic components is avoided, and the alarm is used for alarming, the fixed values of the RAM and the EPROM are different from alarm sounds generated by the operation of an alarm control relay, so that the fault cause can be distinguished from the alarm sounds.

The CPU is also electrically connected with the display screen and the keyboard and used for displaying and operating.

The CPU is also electrically connected with the serial interface and used for connecting with an expansion plug-in conforming to the serial interface.

The input end of the low-pass filter is electrically connected with a test module, the test module is set as a short-circuit fault simulation device and is used for simulating and generating short-circuit faults, the short-circuit fault simulation is only one function of the test module, the test module can simulate power faults such as overvoltage, low voltage, abnormal current, high frequency, low frequency and the like, and whether the device works normally is tested by simulating the power faults.

In the using process of the electric microcomputer monitoring fault splitting device, external current and voltage are input to the analog-to-digital converter through the low-pass filter after being converted through the voltage transformer and the current transformer, the input is input to the CPU after analog-to-digital conversion, the CPU outputs signals to the outlet relay through sampling digital processing, the outlet relay receives the signals, the electric switch is driven to work by conducting the circuit, the electric switch can disconnect the used power supply from a power grid or other power supplies, and the fault power supply is prevented from affecting the whole power grid or other power supplies.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims

1. The utility model provides an electric power microcomputer monitoring trouble disconnection device, includes low pass filter, its characterized in that: the input end of the low-pass filter is electrically connected with the voltage transformer and the current transformer, the output end of the low-pass filter is electrically connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is electrically connected with the CPU, the CPU is electrically connected with the outlet relay, the outlet relay is electrically connected with and controls the on-off of the electric switch, the outlet relay is electrically connected with the alarm control relay, and the alarm control relay is electrically connected with the alarm.

2. The power microcomputer monitoring fault disconnection apparatus according to claim 1, wherein: the CPU is also electrically connected with the RAM and the EPROM, the RAM and the EPROM are electrically connected with the alarm, the CPU is also used for detecting whether the fixed values of the RAM and the EPROM are wrong or not, if so, a fault alarm signal is sent to the alarm, and locking operation is executed.

3. The power microcomputer monitoring fault disconnection apparatus according to claim 1, wherein: the CPU is also electrically connected with the display screen and the keyboard.

4. The power microcomputer monitoring fault disconnection apparatus according to claim 1, wherein: the CPU is also electrically connected with the serial interface and used for connecting with an expansion plug-in conforming to the serial interface.

5. The power microcomputer monitoring fault disconnection apparatus according to claim 1, wherein: the input end of the low-pass filter is also electrically connected with the testing module.

6. The power microcomputer monitoring fault disconnection apparatus according to claim 5, wherein: the test module is arranged as a short-circuit fault simulation device and is used for simulating the generation of short-circuit faults.

7. The power microcomputer monitoring fault disconnection apparatus according to claim 1, wherein: the CPU adopts 80196 single chip microcomputer.