CN206523248U - A kind of structure of breaker of switch cabinet intellectual monitoring - Google Patents

Abstract

A structure for intelligent monitoring of a circuit breaker in a switchgear, including a contact arm and a contact at the end of the contact arm, a groove is provided on the contact arm at the connection with the contact, a temperature sensor is arranged in the groove, and epoxy resin is used The temperature sensor is sealed in the groove, the temperature acquisition module circuit board is fixed on the contact arm, the contact arm is covered with a current transformer, and the output end of the current transformer is connected with the temperature acquisition module circuit board, which is the temperature acquisition module circuit board Power is provided, and the temperature sensor is connected to the circuit board of the temperature acquisition module through a connection line, and an antenna for transmitting a temperature signal is arranged on the circuit board of the temperature acquisition module. The utility model realizes the intelligent monitoring of the circuit breaker, has simple structure, high intelligence level, improves the accuracy and reliability of temperature measurement, and has high popularization and application value.

Description

A structure for intelligent monitoring of circuit breakers in switchgear

technical field

The utility model relates to the technical field of switch cabinets, in particular to an online temperature monitoring device for a circuit breaker.

Background technique

The vacuum circuit breaker of the high-voltage cabinet is an important equipment in the electric power and power grid. Once an accident occurs, it will cause a partial or large area power outage. Therefore, after the equipment has been running for a period of time or during operation, necessary inspection and maintenance must be carried out. When the heads are in contact, there is a contact resistance between them. During normal operation, the resistance of the primary conductive circuit of the circuit breaker, including the contact resistance, is stable, and heat energy is generated through the working current for a long time to increase the temperature of the electrical material. At this time, the temperature rise is general It will not exceed the specified range, but once the conductive circuit has poor contact, the contact resistance is too large, and the temperature rise will exceed the specified value, thereby accelerating the oxidation of the contact between the dynamic and static contacts, and the oxidation results in an increase in the contact resistance value, which in turn promotes heat generation Increase, the temperature increases, and even arcing burns.

Intelligence is the development trend of switchgear, and online detection is the main feature of switchgear intelligence. The development and application of online detection technology has improved the intelligence of switchgear operation management, accelerated the information feedback of switchgear operating status, shortened the time for fault judgment and processing, improved work efficiency, and reduced economic losses caused by power outages , and created conditions for the realization of unattended substations.

As the most important switchgear, the circuit breaker's online monitoring of its performance parameters is particularly important, especially the online monitoring of the temperature rise of the main circuit. At present, the most widely used circuit breakers on the market are indoor vacuum circuit breakers below 40.5kV. In order to facilitate inspection and maintenance, at present, the main current flow circuit is usually formed between the indoor circuit breaker and the matching switch cabinet through sliding contact with the contact fingers. It is easy to have coordination problems between the heads, and it is easy to cause an increase in contact resistance, resulting in excessive temperature rise, resulting in flow problems or insulation accidents. Therefore, the on-line monitoring of the temperature rise at the contact point of the circuit breaker is particularly important.

The existing online temperature measurement method for switchgear is an active wireless temperature measurement method, which cannot solve the problem of the stability of electronic components at high temperatures. The commonly used test method is to select the traditional indirect temperature measurement point on the lead-out copper bar to test the temperature of the copper bar. The principle is to roughly judge the temperature according to the melting degree of paraffin or the color change of the temperature, indirectly infer the connection temperature of the dynamic and static contacts, and implement manual intervention. The second is manual regular inspections, using a hand-held infrared tester to test the temperature of the indirect temperature measurement point through the observation hole, according to the test degree, using the principle of heat conduction, indirectly inferring the connection temperature of the dynamic and static contacts, and implementing manual intervention. The disadvantage of these methods is that the measured temperature is not the temperature at the joint of the dynamic and static contacts, but indirectly infers the temperature at the joint of the dynamic and static contacts. This measured temperature is easily disturbed by external conditions and the environment, resulting in misjudgment , is not conducive to the intelligent realization of the circuit breaker.

Utility model content

The utility model aims to provide an intelligent monitoring structure for a circuit breaker in a switchgear. The temperature is measured through the contact at the contact point of the contact arm, which improves the accuracy and reliability of the temperature measurement and solves the problem of online dynamic monitoring of the primary contact point of the high-voltage circuit breaker. Abnormal temperature rise, and send a signal suitable for computer processing, the whole monitoring process is conducive to the temperature collection of intelligent high-voltage circuit breakers.

The technical scheme that the technical problem that the utility model solves adopts is:

A structure for intelligent monitoring of a circuit breaker in a switchgear, including a contact arm and a contact at the end of the contact arm. Epoxy resin seals the temperature sensor in the groove. The temperature acquisition module circuit board is fixed on the contact arm. The module circuit board provides power, the temperature sensor is connected to the temperature acquisition module circuit board through a connection line, and the temperature signal transmission antenna is arranged on the temperature acquisition module circuit board.

The temperature signal of the temperature sensor measuring contact of the utility model is converted through the circuit board of the temperature acquisition module, and then sent to the temperature control system through the temperature signal transmission antenna to realize the intelligent monitoring of the circuit breaker, which can monitor the temperature of the contact arm on-line in real time and send out a signal suitable for the computer. The processed signal and the whole monitoring process are beneficial to the temperature collection of the intelligent high-voltage circuit breaker. If the temperature is too high, the temperature control system alarm device will alarm. The current transformer provides the power supply for the circuit board of the temperature acquisition module, no external power supply is required; the temperature sensor is sealed in the groove of the contact arm with epoxy resin, the integrated design of the sensor and the contact arm has good insulation performance, and it is easy to install and use. The mechanical movement of the temperature sensor is affected by the product transportation and the opening and closing of the contact arm to ensure the temperature measurement reliability of the switch cabinet; the utility model has a compact structure design and high temperature measurement accuracy.

The beneficial effects of the utility model are: the utility model realizes the intelligent monitoring of the circuit breaker, has a simple structure, a high level of intelligence, improves the accuracy and reliability of temperature measurement, and has high popularization and application value.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a schematic diagram of the structure principle of the utility model.

In the figure: 1. Contact arm 2. Torx contact 3. Current transformer 4. Epoxy resin 5. Temperature sensor 6. Temperature acquisition module circuit board 7. Antenna 8. Connecting wire.

detailed description

In Fig. 1, a switchgear circuit breaker intelligent monitoring structure includes a contact arm 1 and a plum blossom contact 2 at the end of the contact arm 1, and a groove is provided on the contact arm 1 at the connection with the plum blossom contact 2, and the concave A temperature sensor 5 is provided in the groove, and the temperature sensor 5 is sealed in the groove with epoxy resin 4. The temperature acquisition module circuit board 6 is fixed on the contact arm 1, and the contact arm 1 is provided with a current transformer 3, and the current transformer The output terminal of 3 is connected with the circuit board 6 of the temperature acquisition module to provide power for the circuit board 6 of the temperature acquisition module. The temperature sensor 5 is connected with the circuit board 6 of the temperature acquisition module through the connecting wire 8. Temperature signal transmission antenna 7.

The temperature sensor 5 of the utility model measures the temperature signal of the plum blossom contact 2 through the circuit board 6 of the temperature acquisition module and converts it, and then sends it to the temperature control system through the temperature signal transmission antenna 7 to realize intelligent monitoring of the circuit breaker, and can monitor the temperature of the contact arm 1 online in real time Temperature, and send a signal suitable for computer processing, the entire monitoring process is conducive to the temperature collection of intelligent high-voltage circuit breakers. If the temperature is too high, the temperature control system alarm device will alarm. The current transformer 3 provides the circuit board power supply of the temperature acquisition module, and no external power supply is required; the temperature sensor 5 is sealed in the groove of the contact arm 1 with epoxy resin 4, and the integrated design of the sensor and the contact arm 1 has good insulation performance , easy to install and use to avoid the impact on the mechanical movement of the temperature sensor 5 caused by product transportation and the opening and closing of the contact arm 1, and ensure the temperature measurement reliability of the switch cabinet; the utility model has a compact structure design and high temperature measurement accuracy.

Claims (1)

1. a kind of structure of breaker of switch cabinet intellectual monitoring, including contact arm and the contact with contact arm end, it is characterized in that with The contact arm of contact junction, which is provided with groove, groove, is provided with temperature sensor, and temperature sensor is enclosed in epoxy resin Temperature collect module wiring board is fixed with groove, on contact arm, contact arm is arranged with current transformer, the output end of current transformer It is connected with temperature collect module wiring board, power supply is provided for temperature collect module wiring board, temperature sensor passes through connecting line It is connected with temperature collect module wiring board, temperature collect module wiring board is provided with temperature signal transmitting antenna.