Device for detecting AC entering DC bus in DC power system
A technology of DC power supply system and DC bus, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problem that the detection range cannot be fully covered, and achieve the effect of reducing requirements and simple circuit structure
Active Publication Date: 2015-02-04
EMERSON NETWORK POWER CO LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that, for the detection device of the DC bus intrusion into the AC in the prior art DC power supply system, the detection range cannot fully cover the DC circuits HM+, KM+, HM- / KM- and In order to provide a simple structure that can cover the DC loops HM+, KM+, HM- / KM- that often appear in the power system and the ground to enter the AC defect, the DC bus channel in the DC power supply system is provided. Incoming communication detection device
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[0044] Such as Image 6 As shown, in the DC power supply system of the present invention, the detection device 100 for DC bus intrusion into AC includes a voltage division sampling module 110 , an AC extraction and amplification module 120 and an ADC conversion module 130 . Such as Image 6 As shown, the first end of the voltage dividing sampling module 110 is connected to the closing bus positive HM+ or the control bus positive KM+. The second terminal of the voltage dividing sampling module 110 is connected to the closing bus negative HM- and the control bus negative KM-. The third end of the voltage division sampling module 110 is grounded. Thus, the voltage dividing sampling module 110 divides and samples the voltage of the closing bus positive HM+, the control bus positive KM+, the closing bus negative HM- and the control bus negative KM- to the ground, and finally outputs a sampling signal containing an AC component. The AC extracting and amplifying module 120 is conn...
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The invention relates to a device for detecting an AC entering a DC bus in a DC power system. The device comprises a voltage division sampling module, an AC extraction amplification module and an ADC conversion module. The first end of the voltage division sampling module is connected with a switch-on bus plus or a control bus plus; the second of the voltage division sampling module is connected with a switch-on bus minus and / or a control bus minus; the third end of the voltage division sampling module is grounded; the sampling output end of the voltage division sampling module outputs sampling signals comprising AC components; and the voltage division sampling module comprises a first balance bridge resistor and a second balance bridge resistor. The detection device can fully cover AC entering between HM+, HM-,KM+ and KM- and the ground; and the voltage division sampling module only comprises three balance bridge resistors used in the insulation detection device, so that all AC signals can be sampled at a single bridge arm, and meanwhile, the requirement for device parameters is reduced.
Description
technical field [0001] The invention relates to the field of direct current system monitoring, and more specifically relates to a detection device for a direct current bus bar entering an alternating current in a direct current power supply system. Background technique [0002] In the power system, the DC power supply is used as the main control and protection circuit power supply. Due to the large number of cable branches and wiring outlets, there are often faults where AC enters the DC circuit due to miswiring, accidental contact, and device performance degradation. When the AC enters the DC circuit, it is very easy to cause the malfunction of the protective relay. In recent years, many power plants and substations have reported this kind of fault phenomenon. [0003] In power plants and substations, since the alternating current is generally connected to the ground directly or through the arc suppression coil, there are mainly two ways for the alternating current to enter...
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IPC IPC(8): G01R31/02
Inventor 付加友李晨光张武强
Owner EMERSON NETWORK POWER CO LTD