CN201666819U - High voltage switch temperature monitoring and early warning system - Google Patents

Abstract

The utility model relates to a high-voltage switch temperature monitoring and early-warning system. The power supply voltage in temperature monitoring equipment of the existing high-voltage switch cabinet is unstable and the power supply time is short. Therefore, the high-voltage switch temperature monitoring and early-warning system comprises in-cabinet equipment and out-cabinet equipment, wherein the in-cabinet equipment comprises a plurality of wireless temperature sensors and an in-cabinet power supply; the in-cabinet power supply provides the power for the wireless temperature sensors; the out-cabinet equipment comprises a wireless transceiver, a temperature monitoring device and an out-cabinet power supply; the in-cabinet power supply is an induction power supply that comprises an iron core; the iron core surrounds the conductive part of a high-voltage switch and is wound by a coil; the coil and a voltage-stabilizing circuit are connected in series in a power supply circuit of the wireless temperature sensors; furthermore, under the magnetic saturation state of the iron core, the output voltage of the coil does not exceed 10% of the normal working voltage. The high-voltage switch temperature monitoring and early-warning system has the advantages of working stably and reliably, and can be widely applicable to monitoring various high-voltage switch cabinets.

Description

High voltage switch temperature monitoring and early warning system

technical field

The utility model relates to a high-voltage switch temperature monitoring and early warning system, which belongs to the field of temperature measuring devices for high-voltage electricity. the

Background technique

With the development of the power grid and the continuous improvement of equipment levels, high-voltage switchgears are widely used in the power grid, and the internal heating of the switchgear has also become a common problem in the use of switchgears. Due to the airtightness of the switchgear, in some positions with heavy loads, there is a problem of excessive temperature rise of the switchgear, which directly affects the normal operation of the equipment. Moreover, the heating problem is a continuous development process. If it is not controlled, the degree of overheating will continue to increase, which will affect the performance and life of the equipment. At the same time, due to the harsh environment of the electric field, strong electromagnetic interference, and the high voltage of the electric high-voltage switch contacts, the temperature of the contacts cannot be monitored through conventional circuit connections, which also brings certain difficulties to the temperature detection of the switch cabinet. the

Announcement date: September 27, 2006, the Chinese patent with the announcement number CN2821724Y "on-line temperature detection device for handcart-type high-voltage circuit breaker contacts", including power supply circuit, wireless temperature sensor, signal conversion circuit, wireless encoding transmitter, wireless decoding The receiver, the alarm circuit, and the power circuit are composed of current transformers and power conversion circuits installed on the contact arms of each phase. the

The announcement date was October 17, 2007. The utility model patent "switch cabinet contact temperature detection and alarm system" with the announcement number CN101055209A consists of a switch cabinet temperature detection circuit, multiple switch cabinet contact temperature detection circuits, and a corresponding host computer. and remote control center. the

The problem that above-mentioned prior art exists is:

1. Power supply mode: self-powered device and rechargeable battery or disposable high-energy battery running in parallel. Batteries are prone to explosion at high temperatures, posing safety hazards. the

2. Voltage stabilization method: the use of voltage stabilization chips cannot provide wide-range voltage stabilization, and it is difficult to make corresponding iron cores when the load of the switchgear is uncertain; the voltage is unstable under high temperature conditions, and it is easy to burn the sensor and wireless circuit. the

3. Sampling a single temperature chip is affected by the chip temperature range of up to 125 degrees Celsius, and cannot meet the various requirements of a larger temperature range on site. the

Utility model content

The technical problem to be solved by the utility model is how to overcome the above-mentioned defects of the prior art and provide a high-voltage switch temperature monitoring and early warning system. the

In order to solve the above technical problems, this high-voltage switch temperature monitoring and early warning system includes equipment inside the cabinet and equipment outside the cabinet. The equipment inside the cabinet includes multiple wireless temperature sensors and power supplies inside the cabinet. It includes a wireless transceiver, a temperature monitoring device and an external power supply. The external power supply supplies power to the wireless transceiver and the temperature monitoring device. The wireless transceiver transmits the temperature information sent by the wireless temperature sensor to the temperature measuring device. It is characterized in that: the power supply inside the cabinet It is an inductive power supply. The inductive power supply includes an iron core. The iron core surrounds the over-current component of the high-voltage switch. A coil is wound on the iron core. In the state of magnetic saturation, the output voltage of the coil shall not exceed 10% of its normal working voltage. the

Designed in this way, the utility model uses the self-power supply mode of the induction power supply, which makes up for the short supply time of the battery, improves the reliability of the system power supply, prolongs the maintenance cycle of the system, and reduces the maintenance cost. At the same time, the iron core is magnetically saturated Finally, theoretically, the output voltage of the induction power supply reaches the limit, which plays the role of first-level voltage limiting and voltage stabilization; and the voltage stabilizing circuit connected in series with it plays the role of second-level voltage stabilization, making the power supply of the entire cabinet equipment more stable. Stable and reliable. the

As an optimization, the wireless temperature sensor includes a temperature sensing component and a wireless transmitting module, wherein the temperature sensing component is a temperature acquisition chip 18B20 or an RTC thermistor or a thermocouple wireless temperature sensor. This design facilitates the transmission of information through wireless signals inside and outside the cabinet. the

As an optimization, the temperature monitoring device includes a centralized monitoring screen, and all the temperature information monitored by the wireless temperature sensors is sent to the centralized monitoring screen for centralized display via the wireless transceiver. This design facilitates centralized monitoring. the

As an optimization, a wireless transponder is also provided between the centralized monitoring panel and the wireless temperature sensor. With such a design, the wireless transmission distance is long. the

As an optimization, the temperature monitoring device also includes a remote monitoring computer, which is integrated into the local area network together with the centralized monitoring screen, and the temperature information detected by all wireless temperature sensors is not only displayed on the centralized monitoring screen, but also transmitted to the remote through the local area network. Monitor computer to realize remote clinical control. Designed in this way, it is convenient for remote monitoring. the

As an optimization, the voltage stabilizing circuit includes a rectification and filtering circuit, a pulse transformer T1, a pulse control circuit and a feedback circuit, the rectification and filtering circuit includes filters L1, L2 and a rectifier bridge, and the two ends of the induction power coil are respectively connected by filters L1 and L2 The input terminal of the rectifier bridge, the filter capacitor C1 is connected between the positive and negative poles of the rectifier bridge, the voltage regulator diode D1 and the diode D2 are connected in series, and they are connected between the two ends of the primary coil of the pulse transformer T1, and the rectifier bridge and the positive pole are connected to the pulse transformer T1 The primary coil of the pulse transformer T1 is connected in series with the pulse control circuit to form a loop. A capacitor and a resistor are connected in series between the positive and negative poles of the secondary coil of the pulse transformer T1, and the positive pole is connected in series with a diode D3, a filter L3 and a DC voltage stabilizing circuit module. Output terminal; the signal input terminal of the feedback circuit is connected to the input terminal of the DC voltage stabilizing circuit, and the output terminal of the feedback circuit is connected to the signal input terminal of the pulse control circuit. With such a design, the structure is simple, stable and reliable. the

As an optimization, the iron core is divided into left and right parts. During installation, the two parts are fastened to the over-current component, and the iron core and its coil are provided with an insulating shell, corresponding to the iron core, and the insulating shell is also divided into two parts. , and connected by plastic screws. With such a design, the use of plastic screws to connect on the one hand is convenient for installation, and it is convenient to adjust the saturation magnetic flux density of the iron core by adjusting the gap between the two parts of the iron core. On the other hand, the plastic screws will not generate heat due to eddy current loss. the

The temperature monitoring and early warning system for a high-voltage switch of the utility model has the advantages of stable operation, safety and reliability, and is widely applicable to the monitoring of various high-voltage switch cabinets. the

Description of drawings

The following is a further description of the high-voltage switch temperature monitoring and early warning system in conjunction with the attached drawings:

Fig. 1 is the structural representation of embodiment one of this high voltage switch temperature monitoring and early warning system;

Fig. 2 is the circuit schematic diagram of voltage stabilizing circuit in the utility model;

Fig. 3 is a schematic structural diagram of a square induction power supply;

Fig. 4 is the structural representation of circular induction power supply;

Fig. 5 is the structural representation of the second embodiment of the high-voltage switch temperature monitoring and early warning system;

Fig. 6 is a schematic structural diagram of Embodiment 3 of the high-voltage switch temperature monitoring and early warning system. the

In the figure: 1 is a wireless temperature sensor, 2 is a wireless transceiver, 3 is an iron core, 4 is an over-current component, 5 is a coil, 6 is a centralized monitoring screen, 7 is an insulating shell, 8 is a plastic screw, and 9 is a wireless forwarder Device, 10 is a remote monitoring computer, T1 is a pulse transformer, L1, L2, L3 are filters, C1, C2, C3, C4 are filter capacitors, D1 is a Zener diode, D2, D3 are diodes, and R is a resistor. the

specific embodiment

Embodiment 1: As shown in Figures 1 to 4, the high-voltage switch temperature monitoring and early warning system includes equipment inside the cabinet and equipment outside the cabinet, wherein the equipment inside the cabinet includes multiple wireless temperature sensors 1 and power supplies inside the cabinet, and the power supply inside the cabinet is a wireless temperature sensor. The sensor 1 supplies power, and the equipment outside the cabinet includes a wireless transceiver 2, a temperature monitoring device and an external power supply. The external power supply supplies power for the wireless transceiver 2 and the temperature monitoring device. The wireless transceiver 2 transmits the temperature information sent by the wireless temperature sensor 1 to The temperature measuring device is characterized in that: the power supply in the cabinet is an induction power supply, the induction power supply includes an iron core 3, the iron core 3 surrounds the over-current component 4 of the high-voltage switch, a coil 5 is wound on the iron core 3, and the coil 5 and a The voltage stabilizing circuit is connected in series with the power supply circuit of the wireless temperature sensor 1, and when the iron core 3 is magnetically saturated, the output voltage of the coil 5 does not exceed 10% of its normal working voltage. the

The temperature monitoring device includes a centralized monitoring screen 6, and all the temperature information monitored by the wireless temperature sensors 1 is sent to the centralized monitoring screen 6 for centralized display via the wireless transceiver 2. the

As shown in Figures 3 and 4, the iron core 3 is divided into left and right parts. When installed, the two parts are fastened on the over-current component 4, and the iron core 3 and its coil 5 are provided with an insulating shell 7, which is connected to the iron core 3. Corresponding to the core 3, the insulating shell 7 is also divided into two parts, which are connected by plastic screws 8. the

Embodiment 2: As shown in FIG. 5 , a wireless transponder 9 is also provided between the centralized monitoring panel 6 and the wireless temperature sensor 1 . Refer to Embodiment 1 for other structures and components, which are omitted. the

Embodiment three: as shown in Figure 6, described temperature monitoring device also comprises remote monitoring computer 10, and this remote monitoring computer 10 is merged into local area network together with centralized monitoring screen 6, and all wireless temperature sensors 1 monitor temperature information except in centralized monitoring In addition to the centralized display on the screen 6, it is also transmitted to the remote monitoring computer 10 through the local area network to realize remote temporary control. the

In the above embodiment: the wireless temperature sensor 1 includes a temperature sensing component and a wireless transmitting module, wherein the temperature sensing component is a temperature acquisition chip 18B20 or an RTC thermistor or a thermocouple wireless temperature sensor. the

Claims (7)

1. high-voltage switch gear temperature monitoring early warning system, comprise equipment and cabinet external equipment in the cabinet, wherein equipment comprises power supply in a plurality of radio temperature sensors and the cabinet in the cabinet, power supply is the radio temperature sensor power supply in the cabinet, the cabinet external equipment comprises wireless transceiver, device for detecting temperature and cabinet external power, it is characterized in that: power supply is an induction power supply in the cabinet, this induction power supply comprises iron core, this iron core is centered around on the electric parts of mistake of high-voltage switch gear, winding around on the iron core, a coil and a mu balanced circuit together seal in the feed circuit of radio temperature sensor, and under iron core magnetic saturation state, coil output voltage is no more than 10% of its normal working voltage.

2. high-voltage switch gear temperature monitoring early warning system as claimed in claim 1, it is characterized in that: described radio temperature sensor comprises temperature sense parts and wireless transmitter module, and wherein the temperature sense parts are temperature acquisition chip 18B20 or RTC thermistor or thermopair radio temperature sensor.

3. high-voltage switch gear temperature monitoring early warning system as claimed in claim 2 is characterized in that: described device for detecting temperature comprises the Centralized Monitoring screen, and all radio temperature sensors monitor temperature information and all deliver to Centralized Monitoring screen centralized displaying via wireless transceiver.

4. high-voltage switch gear temperature monitoring early warning system as claimed in claim 3 is characterized in that: also be provided with wireless repeater between described Centralized Monitoring screen and the radio temperature sensor.

5. high-voltage switch gear temperature monitoring early warning system as claimed in claim 4, it is characterized in that: described device for detecting temperature also comprises the remote monitoring computing machine, this remote monitoring computing machine is incorporated LAN (Local Area Network) into the Centralized Monitoring screen, all radio temperature sensors monitor temperature information except that Centralized Monitoring screen centralized displaying, also be sent to the remote monitoring computing machine, realize the long-range control of facing by LAN (Local Area Network).

6. as the arbitrary described high-voltage switch gear temperature monitoring early warning system of claim 1 to 5, it is characterized in that: described mu balanced circuit comprises current rectifying and wave filtering circuit, pulse transformer T1, pulse control circuit and feedback circuit, current rectifying and wave filtering circuit comprises wave filter L1, L2 and rectifier bridge, induction power supply coil two ends are respectively through wave filter L1, L2 connects the input end of rectifier bridge, cross-over connection filter capacitor C1 between the rectifier bridge both positive and negative polarity, after voltage stabilizing diode D1 and the diode D2 series connection, be connected across between the pulse transformer T1 primary coil two ends, rectifier bridge, primary coil and pulse control circuit that positive pole meets pulse transformer T1 are connected into the loop, be serially connected with electric capacity between the secondary coil both positive and negative polarity of pulse transformer T1, resistance, and positive pole is connected in series diode D3 in turn, connect output terminal after wave filter L3 and the direct current regulation circuit module; The signal input part of feedback circuit connects the input end of direct current regulation circuit, the signal input part of the output termination pulse control circuit of feedback circuit.

7. high-voltage switch gear temperature monitoring early warning system as claimed in claim 6, it is characterized in that: described iron core is divided into left and right sides two parts, during installation, two parts were fastened on the electric parts, and iron core and coil thereof are provided with insulation crust outward, corresponding with iron core, insulation crust also is divided into two parts, and is connected by plastic screw.

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