Novel portable DC power supply insulation searching device
A DC power supply, portable technology, applied in the direction of power supply testing, measuring devices, measuring electricity, etc., can solve the problems of difficult ground point judgment, on-site DC system wiring, complex and changeable operating conditions, time-consuming and labor-intensive problems, etc.
Pending Publication Date: 2022-06-24
江西远途电力技术服务有限公司
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Problems solved by technology
[0005] 1. Existing products cannot quickly and intuitively confirm the faulty branch by disconnecting the branch power switch. On-site DC system wiring and operating conditions are complex and changeable, and indirect testing is time-consuming and labor-intensive.
[0006] 2. The grounding resistance that can be detected is restricted by the distributed capacitance of the DC system to the ground, and the low-frequency AC signal is easily disturbed by the outside world, which makes it difficult to judge the grounding point
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[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.
[0020] see figure 1 The present invention provides a technical solution: a novel portable DC power insulation search device, which solves the problem that the suspected ground fault branch circuit power switch cannot be easily disconnected during the DC grounding search process by providing an external DC power supply instead of the working power supply. , to quickly confirm the fault branch, including the DC system design circuit and the DC ground fault branch, the DC system design circuit includes voltammeter 1, voltammeter 2, diode D1, diode D2, diode D3, diode D4, AC220 to 120V power supply module , AC220 to 110V power supply module, fi...
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The invention discloses a novel portable direct-current power supply insulation searching device, which relates to the technical field of direct-current power supply and comprises a direct-current system design loop and a direct-current grounding fault branch. The direct current system design loop comprises a volt-ammeter 1, a volt-ammeter 2, a diode D1, a diode D2, a diode D3, a diode D4, an AC 220-to-120 V power supply module, an AC 220-to-110 V power supply module, a slide rheostat and a fixed value resistor, an output DC 110V +, an output DC 110V-and KT1, and a storage battery DC 110V +. Through undisturbed switching of a diode D1, a diode D2, a diode D3 and a diode D4, it is ensured that after a power switch of a ground fault branch is disconnected, a load is not powered off, and a direct current ground fault branch is disconnected from a direct current system design loop, if bus insulation of the direct current system design loop does not change, it can be judged that the branch has no ground fault, otherwise, the branch has a fault; and meanwhile, the power loss of the load cannot be caused after the KT1 is switched off.
Description
technical field [0001] The invention relates to the technical field of DC power supply, in particular to a novel portable DC power supply insulation search device. Background technique [0002] The DC power supply system is widely used in power plants, substations and other places to provide control and power supply for control systems and equipment. When the insulation resistance between the positive or negative pole of the DC power supply system decreases to a certain setting value, or is lower than a certain specified value, then we call the DC system as having a positive ground fault or a negative ground fault. DC systems in power plants and substations are connected to many devices and complex circuits. During long-term operation, the DC system will inevitably be grounded due to changes in the environment, climate change, aging of cables and connectors, problems with the equipment itself, etc. . Especially in the construction or expansion of power plants and substatio...
Claims
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IPC IPC(8): G01R31/12G01R31/40G01R31/52
CPCG01R31/1272G01R31/40G01R31/52
Inventor 尹良宇李心怡尹晓研尹子豪尹航刘泽旭
Owner 江西远途电力技术服务有限公司