Fan inverter cabinet over-temperature protection device
A frequency converter and temperature protection technology, which is applied to emergency protection circuit devices, emergency protection devices with automatic disconnection, circuit devices, etc., can solve problems such as frequency converter failures, reduced equipment availability, and inability to quickly determine The effect of device damage
Inactive Publication Date: 2017-11-14
CHINA DATANG CORP RENEWABLE POWER +1
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Problems solved by technology
Continuous high temperature has seriously affected the operating life of inverter power modules, filter resistors, capacitors and other components. Frequency inverter failures occur from time to time, and equipment availability decreases accordingly.
According to the analysis of long-term operation experience: in most cabinets where inverter failures occur, the water-cooling fan control circuit relay or contactor has been burned out, and the fan refuses to move when the cabinet needs to be cooled, resulting in overheating
Moreover, when the equipment in the cabinet fails due to a fan failure, it often takes a long time for the maintenance personnel to eliminate the failure, and it is impossible to quickly and qualitatively
Method used
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[0016] Such as figure 1 As shown, the over-temperature protection device for the fan inverter cabinet of the present invention is provided with a control branch connected in parallel with the fan M on the fan circuit, and the control branch includes a first control branch, a second control branch, and a third control branch and the fourth control branch, the above four control branches are set in parallel.
[0017] The first control branch includes a temperature control switch WK and a normally closed switch K-3 arranged in series. The operating temperature of the temperature control switch WK is called the fan start temperature, that is, when the temperature of the cabinet reaches this temperature, the fan needs to be started to cool the cabinet, and at this time the temperature control switch WK1 is turned on and powered on.
[0018] The second control branch includes a switch KT-1, an AC contactor K, a power-on delay relay KT, a switch K-2, and a switch WK-1. Among them, ...
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The invention discloses an overtemperature protection apparatus for a fan frequency converter cabinet. Control branches connected in parallel with a fan M are arranged on a fan loop; the control branches include a first control branch, a second control branch, a third control branch and a fourth control branch; the four control branches are arranged in parallel; a switch K-1 connected in series with the fan is arranged on the fan loop; the switch K-1 is connected in parallel with a switch KC; and a switch WK1-2 is connected in series into a safety chain loop. Through the first control branch, the second control branch and the switch K-1, the fan is controlled by utilizing a temperature rise of the cabinet, so that the starting of the fan is guaranteed. By utilizing the third control branch, the fourth control branch and the switch WK1-2 connected in series into a safety chain, the functions of shutting down a wind power unit and prompting overtemperature shutdown in an overtemperature condition of the cabinet are achieved, the damage of apparatuses in the cabinet caused by fan failures is avoided, and maintainers can be helped to conveniently determine a shutdown reason of the wind power unit.
Description
technical field [0001] The invention relates to an over-temperature protection device for a fan inverter cabinet, belonging to the field of electrical protection devices. Background technique [0002] During the operation of wind turbines, the temperature inside the inverter cabinet is very high, especially in summer, it often reaches more than 60 degrees. The continuous high temperature has seriously affected the operating life of inverter power modules, filter resistors, capacitors and other components. Frequency inverter failures occur from time to time, and the availability of equipment decreases accordingly. According to the analysis of long-term operation experience: in most cabinets where inverter failures occur, the water-cooling fan control circuit relay or contactor has been burned out, and the fan refuses to move when the cabinet needs to be cooled, resulting in overheating. Moreover, when the equipment in the cabinet fails due to a fan failure, it often takes a ...
Claims
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IPC IPC(8): H02H5/04
CPCH02H5/047
Inventor 方华王经科侯晓辉王丛发王涛
Owner CHINA DATANG CORP RENEWABLE POWER