CN102944812A - Cable operation fault monitoring device - Google Patents

Abstract

A cable operation fault monitoring device, which is composed of the following: centralized monitoring center (1), online monitoring equipment (2), power dispatching center (3); alarm module (6), power supply; wherein: online monitoring equipment (2) Specifically, it is a temperature detection module (4) and a current detection module (5); the temperature detection module (4) is specifically an infrared sensor SMT9902si; the centralized monitoring center (1) is connected with the online monitoring equipment (2) and the power dispatching center (3) respectively ) There is a GPRS/CDMA 1X wireless data transmission device between them. The device of the present invention can be installed inside the tunnel to adapt to the working environment of high tidal gas and condensed water in the southern tunnel. The device can be used alone with the mobile terminal or with the software platform.

Description

A cable operation fault monitoring device

technical field

The invention relates to the technical field of structural design and application of a power cable operation monitoring device, and in particular provides a cable operation fault monitoring device.

Background technique

The magnitude of the grounding current of the metal sheath of the cable line plays an important role in the safe and stable operation of the cable line.

People are eager to obtain a cable operation fault monitoring device with excellent technical effect.

Contents of the invention

The object of the present invention is to provide a cable operation fault monitoring device with excellent technical effects.

The invention provides a cable operation fault monitoring device, which is used for monitoring the grounding circulation of the metal sheath of the power system 110KV and above; its composition is as follows: centralized monitoring center 1, online monitoring equipment 2, power dispatching center 3; alarm module 6 1. Power supply, wherein: the centralized monitoring center 1 is connected with the remaining parts respectively; the power supply is connected with other parts respectively; it is characterized in that: the online monitoring device 2 is specifically a temperature detection module 4 and a current detection module 5; the temperature The detection module 4 is specifically an infrared sensor SMT9902si of the Netherlands Smartec Company; it is a silicon-based infrared sensor based on a thermopile. A large number of thermocouples are stacked on the underlying silicon base. The high-temperature junctions and low-temperature junctions on the bottom layer isolate their heat through a thin film. The black absorbing layer above the high-temperature junctions converts incident radiation into heat energy, which is controlled by the thermoelectric effect. It can be seen that the output voltage is proportional to the radiation, and the thermopile usually uses BiSb and NiCr as thermocouples. SMT9902sil is embedded with a Ni1000 temperature sensor and a silicon filter with a small viewing angle, which makes the temperature measurement more accurate. Because infrared radiation characteristics are temperature dependent, different filters can be used to measure different temperature ranges. Mature semiconductor technology is product miniaturization and low cost. In order to meet some applications, the infrared sensor opening viewing angle can be designed to be as small as 7°.

A GPRS/CDMA 1X wireless data transmission device is set between the centralized monitoring center 1 and the online monitoring equipment 2 and the power dispatching center 3 respectively. It can solve the problem of wireless signal coverage inside the tunnel. The data transmission unit is responsible for data transmission, and the system can support different communication methods such as GSM and CDMA according to the customer's network conditions.

The temperature detection module 4 is used to monitor the temperature of the cable joint, which is also an important fault detection and inspection method during the operation of the power cable, which can effectively reduce manual inspections and ensure the safe operation of the power grid.

When the grounding current of the metal sheath is abnormal, the system will automatically alarm through the alarm module 6, and the signal is transmitted to the centralized monitoring center 1 in real time, and the grounding current data measured by the current detection module 5 is compared with the cable load data provided by the power dispatching center 3. By comparison and comprehensive analysis, the operation status of the cable metal sheath grounding system can be grasped in real time. The present invention specifically selects 4 temperature sensors, which are mainly used for temperature measurement of cable joints and ambient temperature measurement in tunnels. The sensor is processed with a special material, which can be completely attached to the cable connector and fully contacted. At the same time, it is waterproof, moisture-proof, and corrosion-resistant, and can adapt to various complex and harsh environments in tunnels and trenches.

The current detection module 5 is specifically a MAX417 chip, the measured current is less than 1mA, and a sampling resistor with a resistance value of 100 ohms is connected to it, which is connected to a small chip with 6 pins, and two pins of the chip are connected to the microcontroller through a pull-up resistor Mouth line.

The current detection module 5 can also specifically be an LMK2-0.66 current transformer. The current transformer is a precise current sensor, which is installed on the ground wire of the cable, and outputs the current signal sensed from the ground wire from the secondary terminal. The current transformer has a good linear proportional relationship and saturation performance. The transformer adopts a detachable and waterproof design, which fully meets the requirements of use in the harsh environment of the tunnel. It can be replaced flexibly during maintenance, reducing maintenance costs and increasing the operability of maintenance. The sensor adopts the design of automatic range replacement, which can automatically change the range according to the current size, improving the reliability and accuracy of the equipment.

In the present invention, the on-line monitoring system for the grounding circulation of the cable metal sheath is mainly used for monitoring the grounding circulation of the cable metal sheath of 110KV and above in the power system, and the design of the related wired monitoring system is based on the tunnel laying method currently used in domestic cable laying.

The device of the present invention can be installed inside the tunnel to adapt to the working environment of high tidal gas and condensed water in the southern tunnel. The device can be used alone with the mobile terminal or with the software platform.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

Figure 1 is a schematic diagram of the structure and principle of the cable operation fault monitoring device.

Detailed ways

Example 1

A cable operation fault monitoring device, which is used to monitor the grounding circulation of the metal sheath of the power system 110KV and above; its composition is as follows: centralized monitoring center 1, online monitoring equipment 2, power dispatching center 3; alarm module 6, power supply, Wherein: the centralized monitoring center 1 is connected with the remaining parts respectively; the power supply is connected with the other parts respectively; it is characterized in that: the online monitoring device 2 is specifically a temperature detection module 4 and a current detection module 5; the temperature detection module 4 is specifically It is an infrared sensor SMT9902si from Smartec Company in the Netherlands; it is a silicon-based infrared sensor based on a thermopile. A large number of thermocouples are stacked on the underlying silicon base. The high-temperature junctions and low-temperature junctions on the bottom layer isolate their heat through a thin film. The black absorbing layer above the high-temperature junctions converts incident radiation into heat energy, which is controlled by the thermoelectric effect. It can be seen that the output voltage is proportional to the radiation, and the thermopile usually uses BiSb and NiCr as thermocouples. SMT9902sil is embedded with a Ni1000 temperature sensor and a silicon filter with a small viewing angle, which makes the temperature measurement more accurate. Because infrared radiation characteristics are temperature dependent, different filters can be used to measure different temperature ranges. Mature semiconductor technology is product miniaturization and low cost. In order to meet some applications, the infrared sensor opening viewing angle can be designed to be as small as 7°.

A GPRS/CDMA 1X wireless data transmission device is set between the centralized monitoring center 1 and the online monitoring equipment 2 and the power dispatching center 3 respectively. It can solve the problem of wireless signal coverage inside the tunnel. The data transmission unit is responsible for data transmission, and the system can support different communication methods such as GSM and CDMA according to the customer's network conditions.

The temperature detection module 4 is used to monitor the temperature of the cable joint, which is also an important fault detection and inspection method during the operation of the power cable, which can effectively reduce manual inspections and ensure the safe operation of the power grid.

When the grounding current of the metal sheath is abnormal, the system will automatically alarm through the alarm module 6, and the signal is transmitted to the centralized monitoring center 1 in real time, and the grounding current data measured by the current detection module 5 is compared with the cable load data provided by the power dispatching center 3. By comparison and comprehensive analysis, the operation status of the cable metal sheath grounding system can be grasped in real time. In this embodiment, 4 temperature sensors are specifically selected, which are mainly used to measure the temperature of the cable joint and the ambient temperature in the tunnel. The sensor is processed with a special material, which can be completely attached to the cable connector and fully contacted. At the same time, it is waterproof, moisture-proof, and corrosion-resistant, and can adapt to various complex and harsh environments in tunnels and trenches.

The current detection module 5 is specifically a MAX417 chip, the measured current is less than 1mA, and a sampling resistor with a resistance value of 100 ohms is connected to it, which is connected to a small chip with 6 pins, and two pins of the chip are connected to the microcontroller through a pull-up resistor Mouth line.

In this embodiment, the cable metal sheath ground circulation online monitoring system is mainly used for monitoring the ground circulation of the cable metal sheath of 110KV and above in the power system. The design of the related wired monitoring system is based on the tunnel laying method currently used in domestic cable laying. The equipment described in this embodiment can be installed inside the tunnel to adapt to the working environment of high humidity and condensation in the southern tunnel. The device can be used alone with the mobile terminal or with the software platform.

Example 2

A cable operation fault monitoring device, which is used to monitor the grounding circulation of the metal sheath of the power system 110KV and above; its composition is as follows: centralized monitoring center 1, online monitoring equipment 2, power dispatching center 3; alarm module 6, power supply, Wherein: the centralized monitoring center 1 is connected with the remaining parts respectively; the power supply is connected with the other parts respectively; it is characterized in that: the online monitoring device 2 is specifically a temperature detection module 4 and a current detection module 5; the temperature detection module 4 is specifically It is an infrared sensor SMT9902si from Smartec Company in the Netherlands; it is a silicon-based infrared sensor based on a thermopile. A large number of thermocouples are stacked on the underlying silicon base. The high-temperature junctions and low-temperature junctions on the bottom layer isolate their heat through a thin film. The black absorbing layer above the high-temperature junctions converts incident radiation into heat energy, which is controlled by the thermoelectric effect. It can be seen that the output voltage is proportional to the radiation, and the thermopile usually uses BiSb and NiCr as thermocouples. SMT9902sil is embedded with a Ni1000 temperature sensor and a silicon filter with a small viewing angle, which makes the temperature measurement more accurate. Because infrared radiation characteristics are temperature dependent, different filters can be used to measure different temperature ranges. Mature semiconductor technology is product miniaturization and low cost. In order to meet some applications, the infrared sensor opening viewing angle can be designed to be as small as 7°.

A GPRS/CDMA 1X wireless data transmission device is set between the centralized monitoring center 1 and the online monitoring equipment 2 and the power dispatching center 3 respectively. It can solve the problem of wireless signal coverage inside the tunnel. The data transmission unit is responsible for data transmission, and the system can support different communication methods such as GSM and CDMA according to the customer's network conditions.

The temperature detection module 4 is used to monitor the temperature of the cable joint, which is also an important fault detection and inspection method during the operation of the power cable, which can effectively reduce manual inspections and ensure the safe operation of the power grid.

When the grounding current of the metal sheath is abnormal, the system will automatically alarm through the alarm module 6, and the signal is transmitted to the centralized monitoring center 1 in real time, and the grounding current data measured by the current detection module 5 is compared with the cable load data provided by the power dispatching center 3. By comparison and comprehensive analysis, the operation status of the cable metal sheath grounding system can be grasped in real time. In this embodiment, 4 temperature sensors are specifically selected, which are mainly used to measure the temperature of the cable joint and the ambient temperature in the tunnel. The sensor is processed with a special material, which can be completely attached to the cable connector and fully contacted. At the same time, it is waterproof, moisture-proof, and corrosion-resistant, and can adapt to various complex and harsh environments in tunnels and trenches.

The current detection module 5 can also specifically be an LMK2-0.66 current transformer. The current transformer is a precise current sensor, which is installed on the ground wire of the cable, and outputs the current signal sensed from the ground wire from the secondary terminal. The current transformer has a good linear proportional relationship and saturation performance. The transformer adopts a detachable and waterproof design, which fully meets the requirements of use in the harsh environment of the tunnel. It can be replaced flexibly during maintenance, reducing maintenance costs and increasing the operability of maintenance. The sensor adopts the design of automatic range replacement, which can automatically change the range according to the current size, improving the reliability and accuracy of the equipment.

In this embodiment, the cable metal sheath ground circulation online monitoring system is mainly used for monitoring the ground circulation of the cable metal sheath of 110KV and above in the power system. The design of the related wired monitoring system is based on the tunnel laying method currently used in domestic cable laying.

The equipment described in this embodiment can be installed inside the tunnel to adapt to the working environment of high humidity and condensation in the southern tunnel. The device can be used alone with the mobile terminal or with the software platform.

Claims (3)

1. A cable operation fault monitoring device, which is used to monitor the grounding circulation of the metal sheath of the power system 110KV and above; its composition is as follows: centralized monitoring center (1), online monitoring equipment (2), power dispatching center (3) ; Alarm module (6), power supply, wherein: the centralized monitoring center (1) is connected to the other parts respectively; the power supply is connected to other parts respectively; it is characterized in that: the online monitoring device (2) is specifically a temperature detection module (4), a current detection module (5); the temperature detection module (4) is specifically an infrared sensor SMT9902si; A GPRS/CDMA 1X wireless data transmission device is installed between the centralized monitoring center (1) and the online monitoring equipment (2) and the power dispatching center (3); the temperature detection module (4) is used to monitor the temperature of the cable joint. 2. According to the described cable operation fault monitoring device of claim 1, it is characterized in that: the current detection module (5) is specifically a MAX417 chip, and the measured current is less than 1mA, wherein a sampling resistor with a resistance value of 100 ohms is connected to the On a 6-pin small chip, two pins of the chip are connected to the MCU port line through pull-up resistors. 3. according to the described cable operation fault monitoring device of claim 1, it is characterized in that: The current detection module (5) is specifically an LMK2-0.66 current transformer.

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