CN204190371U - A kind of electric power protective device - Google Patents

Abstract

The utility model discloses an electric power security device, which comprises a data acquisition device, the data acquisition device comprises a voltage forming loop, the voltage forming loop is connected with an analog filter, the analog filter is connected with a sampling holder, and the sampling holder is connected with There are multi-way switches, the multi-way switches are connected with analog-to-digital converters, the data acquisition device is connected to the main body of the central processing unit and the input/output device through a bus, and the main body of the central processing unit is an integrated unit , the input/output device includes a plurality of parallel interfaces, the parallel interface is connected with a photoelectric isolation circuit, the photoelectric isolation circuit is connected with a switch input and a printer, the photoelectric isolation circuit is also connected with a relay, and the relay is connected with a switch Quantity output, the switch quantity output is connected with switch knife switch. When an abnormal operation state occurs in the high-voltage line, the utility model can send a signal or trip in time to protect the normal operation of the high-voltage line.

Description

A power security device

technical field

The utility model relates to the field of electric power technology, in particular to an electric power security device, which is applied in the field of distance protection of high-voltage lines. the

Background technique

The high-voltage lines in the power system often have faults and some abnormal operating states and fault states during operation. The abnormal operating state means that the normal operation of the electrical components in the power system is destroyed, and the operating parameters of each electrical component deviate from the normal state. Allowable operating range, but no faulty operating state. The most common abnormal operation state and the most dangerous are various types of short-circuit faults, and the components of the power system are connected by electricity or magnetism. When any component fails, it may immediately affect the power supply in different degrees. To the normal operation of the system, therefore, the time to remove the faulty components is often required to be as short as 1/10S or even shorter, and this task is impossible to complete by human beings, so a set of relay protection devices is required to handle this task. High-voltage line distance protection refers to a protection device that reflects the distance between the fault point and the protection installation site on the high-voltage line, and determines the action time according to the distance. High-voltage lines are very important equipment links in the power supply system. In order to limit the impact of faults and abnormal operations on the power system to the minimum, it is necessary to install necessary relays with high operating reliability according to the capacity and voltage level of high-voltage lines. Protection devices, most of the existing relay protection devices use electromagnetic relays and simple microcomputer devices, because many of their structures belong to mechanical control and manual operation, which can no longer meet the needs of large-scale industrial power consumption and economic development. With the development of power electronics technology With continuous development, relay protection is gradually developing in the direction of intelligence, electronics, and automation, and more tends to be in line with international standards. This requires a new power security device to replace the existing device to adapt to the international market. develop. the

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a power security device, which is mainly used in the field of high-voltage line distance protection. The performance of the line has been greatly improved. the

In order to achieve the above purpose, the technical solution adopted by the utility model is: a power security device, including a data acquisition device, a central processing unit body and an input/output device, the data acquisition device includes a voltage forming loop, and the voltage forming loop An analog filter is connected, the analog filter is connected with a sample holder, the sample holder is connected with a multiplex switch, the multiplex switch is connected with an analog-to-digital converter, and the multiplex switch is also connected with a man-machine operating mechanism, so The data acquisition device is connected to the main body of the central processing unit and the input/output device through a bus, and the main body of the central processing unit is an integrated unit including a microprocessor, a read-only memory, a random access memory and a timer, The input/output device includes a plurality of parallel interfaces, the parallel interface is connected with a photoelectric isolation circuit, the photoelectric isolation circuit is connected with a switch input and a printer, and the photoelectric isolation circuit is also connected with a relay, and the relay is connected with a switch Output, the switch output is connected with switch knife switch. the

Further, the voltage forming loop also includes an intermediate converter, which is used to reduce and transform the voltage signal of the protected high-voltage line. the

The working principle of the utility model is: the data acquisition device obtains the voltage signal from the protected power line during operation, forms a voltage forming loop through the intermediate converter, and reduces and transforms the voltage signal into the main body of the central processing unit Acceptable voltage value, the analog filter can filter out the high-frequency components in the voltage and current at the beginning of a fault, and the remaining low-frequency components can reduce the hardware requirements for equipment operation, which is comparable to the analog filter The connected sample-and-hold device mainly uses an impedance converter, which presents high impedance at the input end and low impedance at the output end, which is of great significance for maintaining the safe operation of the device. The sampling pulse supplied by the sample-and-hold device passes through the multiple The channel conversion switch is switched into multiple channels, which are converted into digital quantities by the analog-to-digital converter and transmitted to the main body of the central processing unit. The connection between the data collection device and the main body of the central processing unit adopts a direct reading method, and the man-machine operation mechanism is also provided outside the data collection device, and after being connected with the main body of the central processing unit, the labor intensity of the main body of the central processing unit can be reduced . In the input/output device described above, a photoelectric isolation circuit is connected to the switch input interface introduced from the outside of the device, which can effectively weaken and prevent the interference of the input quantity on the device, and the input quantity after passing through the photoelectric isolation circuit enters the central processing through the parallel interface. After processing, it reaches the relay again through the parallel interface and the photoelectric isolation circuit, and the relay controls the switch output to control the opening and closing of the switch knife. The timer in the central processing unit main body can control the switch knife to close After how long it will be turned on again, the printer also provided in the input/output device can print out the relevant status of the equipment operation in real time. the

The beneficial effect of the utility model is: when the electrical components in the system are in an abnormal operation state, it can respond in time and send a signal or trip according to the operation and maintenance conditions. The main function of the utility model in the power system is to improve system operation by preventing accidents or reducing the scope of faults, which is an important anti-accident measure. In a modern power system, if there is no relay protection device, the normal operation of the power system cannot be guaranteed. the

Description of drawings

Below in conjunction with accompanying drawing, the specific structure of the present utility model is described in further detail. the

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is an embodiment of the present utility model. the

Detailed ways

As shown in Figure 1, a kind of power security device comprises a data acquisition device, a central processing unit main body and an input/output device, the data acquisition device includes a voltage forming loop, and the voltage forming loop is connected with an analog filter, and the analog filter The sample holder is connected with a sample holder, the sample holder is connected with a multiplex switch, the multiplex switch is connected with an analog-to-digital converter, the multiplex switch is also connected with a man-machine operating mechanism, and the data acquisition device is connected to the The central processor main body and the input/output device, the central processor main body is an integrated unit, including a microprocessor, read-only memory, random access memory and timer, and the input/output device includes multiple A parallel interface, the parallel interface is connected with a photoelectric isolation circuit, the photoelectric isolation circuit is connected with a switch input and a printer, the photoelectric isolation circuit is also connected with a relay, the relay is connected with a switch output, and the switch output is connected There is a knife switch. the

Further, the voltage forming loop also includes an intermediate converter, which is used to reduce and transform the voltage signal of the protected high-voltage line. the

As shown in Figure 2, it is an embodiment of the present utility model, which adopts the form of wiring. In this embodiment, plug-in structures are widely used, including analog filter plug-ins, sample and hold plug-ins, analog-to-digital conversion plug-ins, and central processing unit The plug-in, relay plug-in and power plug-in form a high-voltage line microcomputer protection device. the

When the utility model is in use, the data acquisition device obtains a voltage signal from the protected power line during operation, forms a voltage forming loop through the intermediate converter, and reduces and transforms the voltage signal into a voltage signal obtained by the main body of the central processing unit. Acceptable voltage value, the analog filter can filter out the high-frequency components in the voltage and current at the beginning of the fault, and the remaining low-frequency components can reduce the hardware requirements when the equipment is running, and connect with the analog filter The sample-and-hold device mainly uses an impedance converter, which presents high impedance at the input end and low impedance at the output end, which is of great significance for keeping the equipment running safely. The sampling pulse supplied by the sample-and-hold device passes through the multiple The conversion switch is switched into a plurality of channels, which are converted into digital quantities by the analog-to-digital converter and transmitted to the main body of the central processing unit. The connection between the data collection device and the main body of the central processing unit adopts a direct reading method, and the man-machine operation mechanism is also provided outside the data collection device, and after being connected with the main body of the central processing unit, the labor intensity of the main body of the central processing unit can be reduced . In the described input and output device, a photoelectric isolation circuit is connected to the switching value input interface introduced from the outside of the device, which can effectively weaken and prevent the interference of the input quantity to the device, and the input quantity after passing through the photoelectric isolation circuit enters the central processing unit through the parallel interface The main body, after being processed, reaches the relay again through the parallel interface and the photoelectric isolation circuit, and the relay controls the opening and closing of the switch in the switch output. the

The above descriptions are only preferred embodiments of the present utility model, and the above-mentioned specific embodiments do not limit the present utility model. All modifications, modifications or equivalent replacements made by those of ordinary skill in the art according to the above descriptions belong to the present utility model. A new type of protection. the

Claims (2)

1. an electric power protective device, comprise data acquisition unit, central processing unit main body and input/output device, it is characterized in that: described data acquisition unit comprises voltage and forms loop, described voltage forms loop and is connected with analog filter, analog filter is connected with sampling holder, sampling holder is connected with multicircuit switch, multicircuit switch is connected with analog to digital converter, described multicircuit switch is also connected with human-machine operation mechanism, described data acquisition unit is connected to described central processing unit main body and described input/output device by bus, described central processing unit main body is an integrated unit, comprise microprocessor, read-only memory, random access memory and timer, described input/output device comprises multiple parallel interface, described parallel interface is connected with photoelectric isolating circuit, described photoelectric isolating circuit is connected with On-off signal and printer, described photoelectric isolating circuit is also connected with relay, relay is connected with output switch parameter, described output switch parameter is connected with plug-in strip opening and closing.

2. electric power protective device according to claim 1, described voltage is formed in loop and also includes intermediate translator, and described intermediate translator is used for the high voltage signal reducing and convert in protected high-tension line.