CN203929129U - Cable temperature and current-carrying capacity on-line monitoring system - Google Patents

Abstract

The utility model discloses a cable temperature and current-carrying capacity on-line monitoring system, which comprises a current detection device, a temperature detection device, an acquisition terminal and an industrial personal computer; the current detection device comprises a first current detector (2) on each single-phase wire (1) in the cable being monitored and a second current detector (4) on the cable bus (3) being monitored; the temperature detection device is fixedly arranged on the cable to be monitored; the first current detector (2), the second current detector (4) and the temperature detection device are respectively connected with the acquisition terminal through connectors, and the acquisition terminal is connected with the industrial personal computer through a remote communication mode. The utility model discloses can monitor the temperature and the current-carrying capacity of cable during operation to can realize that the cable fault point is fixed a position, and measurement accuracy is high, and the interference killing feature is strong.

Description

Cable temperature and ampacity online monitoring system

technical field

The utility model relates to an on-line monitoring system, in particular to an on-line monitoring system for cable temperature and carrying capacity.

Background technique

A cable is a type of rope cable made of several or several groups of wires twisted with at least two wires in each group. Each group of wires is insulated from each other and is often twisted around a center. The entire outside is covered with an insulated overlay. Mainly used in electronic systems, the wire and cable products used in electronic systems mainly include overhead bare wires, busbars (bus bars), power cables (plastic cables, oil-paper cables (basically replaced by plastic power cables), rubber sheathed cables, Aerial insulated cables), branch cables (replacing some busbars), electromagnetic wires, and electrical equipment wires and cables for power equipment, etc.

During the use of the cable, the line needs to be laid, and it needs to be maintained and tested regularly. The main maintenance and testing factors include the current carrying capacity and temperature of the cable during operation, so as to ensure the normal operation of the cable. The traditional cable inspection method is manual inspection, and inspectors regularly or irregularly maintain and inspect cables. The above-mentioned method can guarantee the normal working state of the cable to a certain extent, but the detection workload of the inspection personnel cannot effectively and quickly determine the fault location of the cable, resulting in a long maintenance cycle and a heavy workload of the inspection personnel.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide an online monitoring system for cable temperature and ampacity that can monitor the temperature and ampacity of cables during operation, and can locate cable fault points.

The purpose of this utility model is achieved through the following technical proposals: an online monitoring system for cable temperature and carrying capacity, which includes a current detection device, a temperature detection device, a collection terminal and an industrial computer; The first current detector on each single-phase wire in the electric wire and the second current detector located on the monitored cable bus; the temperature detection device is fixedly installed on the monitored cable; the first current detector, the second The second current detector and the temperature detection device are respectively connected to the collection terminal through the connector, and the collection terminal is connected to the industrial computer through remote communication.

Both the first current detector and the second current detector include a Rogowski coil, an amplifier and a converter, the output end of the Rogowski coil is connected to the input end of the amplifier through an anti-electromagnetic interference absorption circuit, and the output end of the amplifier is connected to the converter The input terminals of the connectors are connected through an A/D conversion circuit, and the output terminals of the converter are connected with the input terminals of the connector.

The said connector is connected with the acquisition terminal via RS485 bus.

Compared with the traditional manual inspection method, the utility model has the following beneficial effects:

1) The current and temperature of the cable can be effectively detected by the current detection device and the temperature detection device, and transmitted to the industrial computer through the acquisition terminal through remote communication, thereby realizing the online monitoring of the cable temperature and current carrying capacity;

2) The current detection device and temperature detection device transmit the detected current value and temperature value to the industrial computer through the connector and the acquisition terminal, and the monitoring personnel analyze the received current value and temperature value to find the fault point and solve the problem caused by Inspection personnel patrol to find cable fault points, which reduces the workload of inspection personnel and shortens the maintenance cycle;

3) The current detector adopts a Rogowski coil and an anti-electromagnetic interference absorption circuit structure, thereby improving the measurement accuracy of the current detection device and the anti-interference ability of the current detection device.

Description of drawings

Fig. 1 is the connection structure diagram of the electric current detecting device of the present utility model and the monitored cable;

Fig. 2 is the principle structural block diagram of the present utility model;

Fig. 3 is the structural representation of the electric current detector of the present utility model;

In the figure, 1-single-phase wire; 2-first current detector, 3-cable bus, 4-second current detector.

Detailed ways

The technical scheme of the utility model is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited to the following description.

As shown in Figures 1 and 2, the cable temperature and current carrying capacity online monitoring system includes a current detection device, a plurality of temperature detection devices, an acquisition terminal and an industrial computer; the current detection device includes each The first current detector 2 on the single-phase wire 1 and the second current detector 4 positioned on the monitored cable bus 3; the temperature detection device is fixedly installed on the monitored cable; the first current detector 2, The second current detector 4 and the temperature detection device are respectively connected to the acquisition terminal through connectors, and the acquisition terminal is connected to the industrial computer through remote communication (such as GPRS remote communication).

As shown in Figure 3, the first current detector 2 and the second current detector 4 both include a Rogowski coil, an amplifier and a converter, and the output end of the Rogowski coil is connected to the input end of the amplifier through an anti-electromagnetic interference absorption circuit , the output end of the amplifier is connected with the input end of the converter through an A/D conversion circuit, and the output end of the converter is connected with the input end of the connector.

The temperature sensing device can use known digital temperature sensors, such as DS18B20, QAH11.1.

The said connector is connected with the acquisition terminal via RS485 bus.

Claims (3)

1. The online monitoring system of cable temperature and ampacity is characterized in that: it includes a current detection device, a temperature detection device, an acquisition terminal and an industrial computer; the current detection device includes each single-phase electric wire ( 1) on the first current detector (2) and the second current detector (4) on the monitored cable bus (3); the temperature detection device is fixedly installed on the monitored cable; the first current The detector (2), the second current detector (4) and the temperature detection device are respectively connected to the collection terminal through connectors, and the collection terminal is connected to the industrial computer through remote communication. 2. The online monitoring system for cable temperature and ampacity according to claim 1, characterized in that: the first current detector (2) and the second current detector (4) both include a Rogowski coil, an amplifier and a converter The output end of the Rogowski coil is connected to the input end of the amplifier through an anti-electromagnetic interference absorption circuit, the output end of the amplifier is connected to the input end of the converter through an A/D conversion circuit, and the output end of the converter is connected to the connector connected to the input. 3. The online monitoring system for cable temperature and ampacity according to claim 1, characterized in that: said connector is connected to the collection terminal via RS485 bus.