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Load box

A load box and load resistance technology, applied in circuit breaker testing, measuring devices, instruments, etc., can solve problems such as damage to DC motors, and achieve the effects of avoiding damage, strong practicability, and a wide range of tests

Pending Publication Date: 2018-01-19
GUANGDONG FULLDE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the frequent DC conversion of the DC motor in this way, the DC motor is prone to damage

Method used

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Embodiment Construction

[0011] like figure 1 As shown, the positive busbar and the negative busbar are used to obtain 120V DC from the external power supply, the load resistor R11 is connected in series with the switch K1 and then connected between the positive busbar and the negative busbar, and the analog resistor R12 is connected in series with the switch K12 and then connected between the positive busbar and the negative busbar , wherein, the resistance value of the load resistor R11 is 6Ω, and the resistance value of the analog resistor R12 is 1.2Ω. When the switch K1 is closed, the load resistor R11 is affected by the pressure difference to generate a load current of 20A, and the control switch K12 is closed, so that the analog The two ends of the resistor R12 also generate a 120V voltage difference, and then generate an analog current of 100A. After the analog current and the load current are combined, the output current of the load box suddenly rises to 6 times the load current, that is, 120A,...

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Abstract

The invention relates to the field of anti-surge test and particularly relates to a load box. The load box takes a direct current from the outside, so that a voltage difference is generated between apositive bus and a negative bus. The voltage difference acts on a load resistor R11 to generate a load current. At the moment, a switch K12 is closed. A simulation resistor R12 and the load resistor R11 are connected in parallel. The resistance value of the output end of the load box is reduced, and the current of the output end of the load box is suddenly increased. In this way, the suddenly increasing process of the surge current is simulated. After the switch K12 is switched on for a short period of time, the switch K12 is switched off. At this time, the current of the output end of the load box is reduced to the original state. In this way, the suddenly decreasing process of the surge current is simulated. Through simulating the outputted surge current of a direct-current motor, the load box can be adopted to replace the direct-current motor to output the surge current to a switching element during the anti-surge test process. The direct-current motor is prevented from being damaged. Moreover, through simulating the resistance change of the resistor R12, the peak value of the surge current can be simply adjusted. Therefore, the load box is wide in test range and high in practicability.

Description

technical field [0001] The invention relates to the field of anti-surge testing, in particular to a load box. Background technique [0002] Switching devices are often switched between open and closed states. Since electrical appliances are prone to surge currents during switching from open to closed, switching devices are required to have strong surge resistance. If the switching device is not strong in anti-surge capability, it should not be allowed to circulate in the market, otherwise it will harm other equipment. Therefore, the anti-surge test must be performed on the switching device before leaving the factory. The common anti-surge test method is to directly DC convert the surge waveform on the DC motor through PLC control, and output the surge waveform to the switching device to test the performance of the switching device. However, in this way, since the DC motor needs to perform DC conversion frequently, the DC motor is prone to damage. Contents of the invention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/28G01R31/327
Inventor 吴彬梁锦桥黄赫
Owner GUANGDONG FULLDE ELECTRONICS
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