CN205539320U - Cable termination arcing ground monitoring devices - Google Patents

Abstract

The utility model relates to the technical field of circuit protection devices. The utility model provides a cable terminal arc grounding monitoring device, which is installed on the cable terminal head on the cable terminal tower, including an arc light sensor, a current detection circuit, a microprocessor module and a wireless communication device. Transmission module; the arc light sensor, current detection circuit and wireless communication transmission module are all electrically connected to the microprocessor module, and the number of the arc light sensors is multiple, which are respectively installed on the cable terminal tower facing the cable terminal head At multiple locations, the current detection circuit is multi-channel, which are respectively connected to the clamps of the lead-out lines of each cable terminal head on the cable terminal tower. The utility model can make up for the insufficient strength of manual timing patrol inspection, and at the same time, the wireless transmission mode can effectively reduce the problem of wiring, so that the installation of such widely distributed monitoring equipment can be realized.

Description

A cable terminal arc grounding monitoring device

technical field

The utility model relates to the technical field of circuit protection devices, in particular to a cable terminal arc grounding monitoring device on an outdoor terminal tower for wireless transmission of alarm information.

Background technique

High-voltage power cables are used more and more widely in power transmission systems, and the number of cable terminal towers used to connect overhead lines and underground cables is increasing day by day. Once the cable terminal tower fails, the scope of influence will be large, so the operation and maintenance of the cable terminal becomes a new challenge. If effective monitoring and protection measures cannot be taken in time, when an arc fault occurs at the cable terminal, it will often cause huge economic losses.

At present, in the monitoring technology of the power system, the arc light detection method is used to realize the protection of the arc light short circuit fault of the switchgear, which has practical application. For the cable terminals distributed at both ends of the transmission cables and the distribution positions are extremely scattered, it is difficult for the current monitoring methods to achieve a complete coverage monitoring network.

Utility model content

In order to solve the above technical problems, the utility model provides a cable terminal arc grounding monitoring device, using the arc signal as one of the protection criteria, combined with the overcurrent information that will appear when a fault occurs, the collected arc light of the cable terminal Fault alarm signals are sent to operation and maintenance personnel in real time, which can make up for the lack of manual regular inspections. At the same time, the use of wireless transmission can effectively reduce wiring problems, allowing the installation of such widely distributed monitoring equipment to be realized.

In order to achieve the above purpose, the technical solution adopted by the utility model is a cable terminal arc grounding monitoring device, including: an arc light sensor, a current detection circuit, a microprocessor module and a wireless communication transmission module; the arc light sensor, Both the current detection circuit and the wireless communication transmission module are electrically connected to the microprocessor module. The number of the arc light sensors is multiple, and they are respectively installed at multiple positions on the cable terminal tower facing the cable terminal head. The current detection circuit It is multi-channel, respectively connected to the clamps of the lead-out lines of each cable terminal head on the cable terminal tower.

Further, the arc light sensor module is a micro arc light sensor, the input signal is arc light, and the output signal is 5VTTL level, and the micro arc light sensor can set the opening threshold through RS485 for matching with the arc light signal detected at the input terminal. In contrast, when the arc light signal detected at the input terminal is greater than the threshold value, it outputs a 5VTTL level, and the results of each arc light sensor are used as the input of the first OR gate L1. The current detection circuit includes a current transformer, each of which is collected by the current transformer The overcurrent signal of the wire core at the cable terminal head is converted into a DC signal through a rectifier bridge, and a voltage stabilizing circuit is connected after the rectifying bridge, and an A/D converter is connected after the voltage stabilizing circuit. The results of each current collection current and current signal conditioning circuit are used as the input of the second OR gate L2, and the calculation result of the first OR gate L1 of the arc detection module and the second OR gate L2 calculation result of the current detection circuit are used as the third AND gate The input of L3, the operation result of the third AND gate L3 is sent to the microprocessor module.

Further, the microprocessor model is PIC16F877A.

Further, the wireless communication transmission module uses a GPRS module to send the alarm signal to the mobile phone of the operation and maintenance personnel in real time as a short message.

Further, it also includes a power module, and the arc light sensor, the current detection circuit, the microprocessor module and the wireless communication transmission terminal are all powered by the power module.

Compared with the prior art, the utility model has the following advantages by adopting the above-mentioned technical scheme:

The utility model discloses a cable terminal arc grounding monitoring device on an outdoor terminal tower for wirelessly transmitting alarm information, comprising an arc light sensor module, a current detection circuit, a microprocessor module, a wireless communication module and a power supply module; the arc light sensor And the current collection sends an alarm message to the personal mobile phone of the operation and maintenance personnel through the wireless transmitter. The utility model transmits the arc fault signal of the terminal head on each outdoor terminal tower with far geographical distance to the operation and maintenance personnel through the wireless transmitter, so as to realize real-time monitoring. At the same time, since outdoor terminal towers are the conversion points of overhead lines and cables, they are often located in the suburbs of cities and are widely distributed, and the number has been increasing in recent years. The use of wireless transmission greatly reduces wiring.

Description of drawings

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

Fig. 2 is a schematic diagram of the installation position of the arc light sensor and the current detection circuit according to the embodiment of the present invention.

detailed description

The utility model is further described now in conjunction with accompanying drawing and specific embodiment.

As a specific embodiment, as shown in Figure 1 and Figure 2, the cable terminal arc grounding monitoring device includes an arc light sensor 1, a current detection circuit 2, a microprocessor module 3 and a wireless communication transmission module 4; the arc light The sensor 1, the current detection circuit 2 and the wireless communication transmission module 4 are all electrically connected to the microprocessor 3 module. There are multiple arc light sensors, which are respectively installed on the cable terminal tower facing the cable terminals. position, and the arc light sensor 1 is installed on the cable terminal iron tower on the bracket facing the terminal head. The current detection circuit 2 is multi-channel, respectively connected to the clamps of the lead-out wires of each cable terminal head on the cable terminal tower.

The arc light sensor and its comparison result are transmitted to operation and maintenance personnel in real time through wireless data transmission. The arc light sensor module is a micro arc light sensor, the input signal is arc light, and the output signal is 5VTTL level. The micro arc light sensor can be set to open threshold through RS485, which is used to compare with the arc light signal detected at the input end, When the arc light signal detected by the input end is greater than the opening threshold, it outputs 5VTTL level, and the results of each arc light sensor are used as the input of the first OR gate L1.

The current detection circuit includes a current transformer. The overcurrent signal of each cable terminal core collected by the current transformer is converted into a DC signal through a rectifier bridge. The rectifier bridge is connected with a voltage stabilizing circuit, which is connected with an A/D converter. The results of each current collection current and current signal conditioning circuit are used as the input of the second OR gate L2, and the calculation result of the first OR gate L1 of the arc detection module and the second OR gate L2 calculation result of the current detection circuit are used as the third AND gate The input of L3, the operation result of the third AND gate L3 is sent to the microprocessor module.

The microprocessor model is PIC16F877A. The microprocessor module transmits the alarm signal to the operation and maintenance personnel through the wireless communication module.

The wireless communication transmission module 4 is a GPRS DTU, and the power supply module 5 is electrically connected with the arc light sensor 1, the current detection circuit 2, the microprocessor 3 and the wireless communication transmission module (GPRS DTU) 4 to supply power for each module.

The working principle of this embodiment: when an arc fault occurs on the cable terminals on each cable terminal tower, the current suddenly increases and an arc light signal is generated. The arc light probe installed on the tower facing the angle steel of the cable terminal detects the arc light signal, compares it with the preset arc light signal through the arc light sensor, and transmits the comparison result to the microprocessor. The current sensor installed at the outlet of the cable terminal, the detected overcurrent signal is sent to the microprocessor. The microprocessor generates an alarm signal according to the current information and arc light information at the time of the fault, and transmits it to the operation and maintenance personnel in real time through GPRS wirelessly. The operation and maintenance personnel can receive the alarm message directly on the mobile phone, so the real-time performance of the signal can be guaranteed, and the alarm process can be prevented from taking too long and causing serious consequences.

Although the utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the appended claims, changes in form and details may be made. Making various changes to the utility model is within the protection scope of the utility model.

Claims (5)

1. A cable terminal arc grounding monitoring device is characterized in that: it comprises an arc light sensor, a current detection circuit, a microprocessor module and a wireless communication transmission module; the arc light sensor, the current detection circuit and the wireless communication transmission module are all compatible with The microprocessor module is electrically connected, and the number of the arc light sensors is multiple, which are respectively installed at multiple positions on the cable terminal tower facing the cable terminal head, and the current detection circuit is multiple, respectively connected to the cable terminal tower At the clamps of the lead-out wires of each cable terminal head on the 2. A cable terminal arc grounding monitoring device according to claim 1, characterized in that: the arc light sensor module is a micro arc light sensor, the input signal is arc light, the output signal is 5VTTL level, and the micro arc light The sensor can set the opening threshold through RS485, which is used to compare with the arc light signal detected at the input end. When the arc light signal detected at the input end is greater than the opening threshold, it outputs a 5VTTL level. The results of each arc sensor are used as the first or The input of gate L1, the current detection circuit includes a current transformer, and the overcurrent signal of each cable terminal core collected by the current transformer is converted into a DC signal through a rectifier bridge. The rectifier bridge is connected with a voltage regulator circuit, and the voltage regulator circuit is connected with A /D converter, the results of each current collection current and current signal conditioning circuit are used as the input of the second OR gate L2, the calculation result of the first OR gate L1 of the arc detection module and the second OR gate L2 calculation result of the current detection circuit, As the input of the third AND gate L3, the operation result of the third AND gate L3 is sent to the microprocessor module. 3. A cable terminal arc grounding monitoring device according to claim 1, characterized in that: the model of the microprocessor is PIC16F877A. 4. A cable terminal arc grounding monitoring device according to claim 1, characterized in that: the wireless communication transmission module adopts a GPRS module, and sends the alarm signal to the mobile phone of the operation and maintenance personnel in real time as a short message. 5. A cable terminal arc grounding monitoring device according to claim 1, characterized in that: it also includes a power module, and the arc light sensor, current detection circuit, microprocessor module and wireless communication transmission terminal are all powered by the power module powered by.