Circuit for automatically displaying SPD fault of distribution box

By installing SPD alarm indicator lights on the distribution box housing, the problem of difficulty in detecting faults at the first time is solved, timely fault display and maintenance are achieved, and the safety and maintenance efficiency of the equipment are improved.

CN223260236UActive Publication Date: 2025-08-22SINOPEC NANJING ENG & CONSTR +1
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Patent Information

Application Number
CN202422467117.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-12
Publication Date
2025-08-22
Estimated Expiration
2034-10-12

AI Technical Summary

Technical Problem

When the SPD in the existing distribution box fails, it is difficult for maintenance personnel to know it as soon as possible, resulting in the distribution box operating in an unprotected state, and there is a risk of components being damaged.

Method used

Install the SPD alarm indicator light on the distribution box housing, and the SPD alarm dry contact closing control indicator light is on to display the fault status.

Benefits of technology

It facilitates maintenance personnel to detect and replace faulty SPDs in a timely manner, avoid damage to components, and improves equipment safety and maintenance efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a distribution box SPD fault automatic display circuit which is characterized in that the distribution box SPD fault automatic display circuit comprises an SPD alarm indicating lamp, the SPD alarm indicating lamp is connected to an SPD alarm dry contact, and when the SPD alarm dry contact is closed, a loop where the SPD alarm indicating lamp is located is closed and electrified. When the SPD in the distribution box has a fault, the SPD alarm contact is closed, and the alarm indicating lamp on the shell of the distribution box is turned on to display the SPD fault.
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Description

Technical Field

[0001] The utility model belongs to the technical field of electrical design and electrical equipment, and particularly relates to a circuit for automatically displaying SPD faults in a distribution box. Background Art

[0002] According to regulatory requirements, an SPD (surge protector) must be installed at the main distribution box where the indoor low-voltage power supply is introduced. SPDs are also required at the power, lighting distribution boxes, and maintenance power boxes in outdoor installation areas to limit transient overvoltages and discharge surge currents. SPDs are installed inside the distribution box, and the box casing must be opened to check for faults. This is especially true for outdoor distribution boxes, which require excellent sealing due to waterproofing, dustproofing, corrosion resistance, and explosion-proofing. These boxes are heavy, making them difficult to disassemble and restore, and are therefore not frequently opened by maintenance personnel. This means that if an SPD fails, maintenance personnel will not be immediately aware of it, causing the distribution box to operate without SPD protection, exposing the components inside to the risk of damage from transient overvoltages and surge currents. Utility Model Content

[0003] The utility model aims to provide a circuit for automatically displaying SPD faults in a distribution box. When the SPD in the distribution box fails, the fault can be displayed on the box shell.

[0004] The technical solution adopted by the utility model is:

[0005] A circuit for automatically displaying SPD faults in a distribution box includes an SPD alarm indicator light connected to an SPD alarm dry contact. When the SPD alarm dry contact is closed, the circuit where the SPD alarm indicator light is located is closed and energized.

[0006] Preferably, the SPD alarm dry contact is connected to the mains via a fuse FU.

[0007] Preferably, the SPD is an SPD with a fault self-alarm function, and has an SPD alarm dry contact.

[0008] Preferably, the SPD alarm dry contact is located inside the distribution box.

[0009] Preferably, the SPD alarm indicator light is arranged on the outer casing of the distribution box.

[0010] Preferably, the SPD alarm indicator light is yellow.

[0011] Preferably, the SPD alarm indicator light is an LED indicator light.

[0012] Beneficial effects of the utility model

[0013] When the SPD in the distribution box fails, the SPD alarm contact closes and the alarm indicator light on the distribution box casing lights up, indicating an SPD failure.

[0014] The utility model facilitates maintenance personnel to timely discover SPD faults in the distribution box, replace the SPDs, and eliminate the faults.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the circuit wiring diagram of the utility model

[0017] Figure 1 The markup in is as follows:

[0018] a, b: SPD fault alarm dry contact wiring terminals with automatic fault alarm function.

[0019] L, N: Power supply for fault indicator light.

[0020] FU: Fuse. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the following embodiments, but the scope of protection of the present invention is not limited thereto:

[0022] Combine Figure 1 Install an SPD with automatic fault alarm (such as the CPM-R dry contact alarm SPD from Tianjin Zhongli Shendun Electronic Technology Co., Ltd.) in the distribution box. Install an SPD alarm indicator light on the distribution box housing. Connect the SPD alarm dry contact in series with the indicator light's power circuit. When the SPD alarm dry contact closes, the circuit containing the SPD alarm indicator light closes and energizes.

[0023] In a preferred embodiment, the SPD alarm dry contact is connected to the mains via a fuse FU.

[0024] The utility model facilitates maintenance personnel to timely discover SPD faults in the distribution box, replace the SPDs, and eliminate the faults.

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the scope of protection of the present invention in any form, and any technical solutions obtained by equivalent substitution or the like fall within the scope of protection of the present invention.

[0026] The parts not involved in the present invention are the same as the existing technology or can be implemented by using the existing technology.

Claims

1. A circuit for automatically displaying SPD faults in a distribution box, characterized in that The device comprises an SPD alarm indicator light, which is connected to an SPD alarm dry contact. When the SPD alarm dry contact is closed, the circuit where the SPD alarm indicator light is located is closed and energized.

2. The circuit according to claim 1, characterized in that The SPD alarm dry contact is connected to the mains through the fuse FU.

3. The circuit according to claim 1, characterized in that The SPD is an SPD with a fault self-alarm function and has an SPD alarm dry contact.

4. The circuit according to claim 1, characterized in that The SPD alarm dry contact is located inside the distribution box.

5. The circuit according to claim 1, characterized in that The SPD alarm indicator light is arranged on the outer shell of the distribution box.

6. The circuit according to claim 1, characterized in that The SPD warning indicator light is yellow.

7. The circuit according to claim 1, characterized in that The SPD alarm indicator light is an LED indicator light.