Non-power-off detection type leakage protector
The leakage current protection device, with its split structure and mechanical interlock design, solves the problem of circuit interruption caused by testing in existing technologies, enabling leakage current detection without power interruption, thus ensuring the continuity of power supply and the normal operation of equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAXING MATERNAL & CHILD HEALTH HOSPITAL
- Filing Date
- 2025-04-07
- Publication Date
- 2026-05-08
AI Technical Summary
Existing residual current devices (RCDs) must be triggered to trip during testing, causing circuit interruption and affecting power supply continuity. This is especially problematic in special settings such as hospitals and data centers where frequent testing is not feasible.
Design a split-type residual current device (RCD) that connects the circuit breaker body and the RCD module through a mechanical interlocking mechanism and a spring wire. This ensures that the test button cannot be triggered when the circuit breaker body is not separated, but is exposed after separation to trigger the test signal. The mechanical interlocking mechanism also ensures that the circuit breaker body remains conductive after the test.
It enables periodic testing of leakage current devices without interrupting the circuit, ensuring normal equipment operation and avoiding unplanned downtime. It is particularly suitable for locations with high requirements for power supply continuity.
Smart Images
Figure CN224217450U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of leakage current protection technology, and specifically relates to a non-power failure detection type leakage current protection device. Background Technology
[0002] A residual current device (RCD), also known as a residual current circuit breaker, is primarily used to protect equipment from electrical leakage faults and to protect individuals from potentially fatal electric shocks. It provides overload and short-circuit protection, protecting circuits or motors from overload and short circuits. It can also be used for infrequent switching and starting of circuits under normal conditions. The RCD works by detecting the imbalance of current in the live and neutral wires to determine if there is a leakage. If a leakage occurs, the current imbalance will trigger the circuit breaker to trip. However, prolonged disuse may lead to decreased sensitivity and inability to accurately detect leakage. Therefore, to ensure the RCD functions properly, its test button should be pressed monthly to simulate a leakage situation and check its operational status.
[0003] However, existing residual current devices (RCDs) must trip during testing, causing a circuit interruption. This can lead to unplanned shutdowns of electrical equipment, and frequent testing can affect the continuity of power supply. This is especially problematic in special locations such as hospitals and data centers where routine testing is not feasible. Utility Model Content
[0004] To address the aforementioned issues, this invention provides a non-power-out detection type leakage current protector that can perform routine monthly tests without triggering a power outage.
[0005] Therefore, the technical solution of this utility model is: a non-power failure detection type leakage current protection device, including a circuit breaker body, a leakage current protection module and a base plate. The circuit breaker body is fixedly installed on the base plate, and a guide rail is provided on the base plate. The leakage current protection module is slidably installed on the guide rail.
[0006] A test button is provided on the front side of the leakage current protection module, and a baffle is provided on the circuit breaker body; when the circuit breaker body and the leakage current protection module are assembled, the test button is placed under the baffle, and the leakage current protection module can drive the circuit breaker body to trip through the mechanical interlocking mechanism.
[0007] The leakage protection module moves along the guide rail until the test button is exposed from the baffle, at which point the mechanical interlock mechanism is in the disengaged state.
[0008] Based on the above scheme and as a preferred embodiment of the above scheme: a limit block is provided on the side of the guide rail. When the leakage protection module is in contact with the limit block, the test button is exposed and the mechanical interlocking mechanism is in the off state.
[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the upper and lower ends of the circuit breaker body are provided with slots, and the upper and lower ends of the leakage protection module are provided with fasteners. When the circuit breaker body and the leakage protection module are assembled, the fasteners can be fastened onto the slots.
[0010] Based on the above scheme and as a preferred embodiment of the above scheme: the circuit breaker body and the leakage protection module are provided with a number of matching positioning posts and positioning holes on opposite sides.
[0011] Based on the above scheme and as a preferred embodiment of the above scheme: a power line is connected between the circuit breaker body and the leakage protection module, and the power line is a spring wire.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the circuit breaker body and the leakage current protection module are set as separate structures. When the two are assembled, the test button of the leakage current protection module is under the baffle and will not be accidentally touched. Only when the circuit breaker body and the leakage current protection module are separated (i.e., the mechanical interlocking mechanism is disengaged) can the test button be exposed from the baffle and the test signal can be triggered. After triggering, the knife switch on the leakage current protection module trips normally, while the circuit breaker body remains in the conducting state and will not trigger a power outage. After the test, the circuit breaker body and the leakage current protection module are assembled and locked with a snap fastener, so that the mechanical interlocking mechanism reconnects the circuit breaker body and the leakage current protection module, thereby protecting the circuit normally. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model when assembled;
[0014] Figure 2 This is a front view of the assembled structure of this utility model;
[0015] Figure 3 This is a schematic diagram of the structure during testing of this utility model;
[0016] Figure 4 This is a front view of the structure of this utility model during testing;
[0017] Figure 5 This is the circuit diagram of a residual current device (RCD).
[0018] The components in the diagram are labeled as follows: circuit breaker body 1, slot 11, sliding groove 12, baffle 13, first switch 14, leakage protection module 2, fastener 21, test button 22, second switch 23, power cord 3, mechanical interlocking mechanism 4, base plate 5, guide rail 51, limit block 52. Detailed Implementation
[0019] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.
[0021] See the attached diagram. The non-power-off detection type residual current device (RCD) described in this embodiment includes a circuit breaker body 1, an RCD module 2, and a base plate 5, all separately configured. Both the circuit breaker body 1 and the RCD module 2 have independent housings. The circuit breaker body 1 and the RCD module 2 have several matching positioning posts and positioning holes on their opposing sides. When the two are assembled, the positioning posts can be inserted into the positioning holes to prevent misalignment. Simultaneously, the upper and lower ends of the circuit breaker body 1 are provided with slots 11, and the upper and lower ends of the RCD module 2 are provided with fasteners 21. When the circuit breaker body 1 and the RCD module 2 are assembled, the fasteners 21 can be fastened onto the slots 11 to prevent them from separating and affecting the normal residual current protection function.
[0022] The circuit breaker body 1 is fixedly mounted on the base plate 5, and the base plate 5 is provided with a guide rail 51. The leakage current protection module 2 is slidably mounted on the guide rail 51. A limiting block 52 is provided on the side of the guide rail 51. When the leakage current protection module 2 is in contact with the limiting block 52, it separates from the circuit breaker body 1. At this time, the test button 22 is exposed and the mechanical interlocking mechanism is in the disengaged state, which can trigger the test button. The limiting block can limit the test position of the leakage current protection module 2 to prevent it from not being completely separated from the circuit breaker body during testing.
[0023] A power line 3 is connected between the circuit breaker body 1 and the leakage protection module 2. The power line is a spring wire that can be extended and retracted, making it easy to separate the circuit breaker body and the leakage protection module.
[0024] The leakage current protection module 2 includes a leakage current detection circuit, a test button 22, and an electromagnetic tripping mechanism. The test button 22 is located on the front side of the leakage current protection module 2, and a baffle 13 is provided on the circuit breaker body 1. When the circuit breaker body 1 and the leakage current protection module 2 are assembled, the test button 22 is placed under the baffle 13, and the electromagnetic tripping mechanism can drive the circuit breaker body 1 to trip through the mechanical interlocking mechanism. At this time, the test button 22 cannot be pressed, that is, the monthly leakage current detection function cannot be triggered. However, when a leakage current occurs, the leakage current protection module 2 functions normally and can drive the circuit breaker body to trip.
[0025] When monthly leakage current protection function tests are required on one side, in order to avoid triggering the tripping and power outage of the circuit breaker body 1, the upper and lower latches 21 are opened, allowing the leakage current protection module 2 to move along the guide rail until it abuts against the limit block. At this time, the leakage current protection module 2 is separated from the circuit breaker body 1, so that the test button 22 is completely exposed from the baffle 13. At this time, the mechanical interlocking mechanism 4 is in the open state, that is, after the test signal is triggered, only the second switch 23 on the leakage current protection module 2 trips, while the first switch 14 on the circuit breaker body 1 remains in the closed state, and its downstream load will not be de-energized, thus avoiding power outage problems.
[0026] After the leakage protection function test is completed, reset the second switch 23, move the leakage protection module 2 to merge with the circuit breaker body 1, and fasten the upper and lower locking pieces 21.
[0027] The mechanical interlocking mechanism is combined with the electromagnetic tripping mechanism and includes conventional structures such as an iron core, springs, and linkage rods. When leakage current is detected, the zero-sequence current transformer transmits a signal to the amplification circuit, triggering the trip coil to operate. After the trip unit operates, it triggers the interlocking mechanism, causing the circuit breaker to trip. The mechanical interlocking mechanism remains locked after tripping and requires manual reset to restore power supply.
[0028] Mechanical interlocking mechanisms ensure the reliability of leakage current protection through rigid structures. Their core function is to forcibly disconnect the circuit and maintain the disconnected state, preventing malfunctions when the fault has not been cleared. This design combines electromagnetic drive (such as a trip coil) with mechanical transmission (such as a linkage rod), and is a key component of the leakage current protection device's actuator, representing existing conventional technology.
[0029] The working principle of residual current devices (RCDs) is also based on existing conventional technology, such as... Figure 5 As shown:
[0030] A 220V AC voltage is connected to a load (light bulb) at the output terminal via contacts inside the residual current device (RCD). Inside the RCD, a coil E is wound around two wires. This coil is connected to the coil E2 of the iron core. When a person is not in contact with the wires, the currents I1 and I2 flowing through the two wires are equal in magnitude and opposite in direction. They generate magnetic fields of equal magnitude and opposite direction, which cancel each other out. The magnetic field passing through coil E1 is zero, so coil E1 does not generate an electromotive force, and the armature does not actuate. Once a person comes into contact with the wires, such as... Figure 5 As shown, a portion of the current I3 (leakage current) will pass directly to the ground through the human body and then return to the other end of the power supply through the ground. In this way, the currents I1 and I2 flowing through the two wires inside the leakage current protector are not equal, and the magnetic fields they generate are also not equal and cannot completely cancel each other out. That is, a magnetic field passes through the E1 coil on the two wires, and the coil will generate current. The current flows into the E2 coil on the iron core. The E2 coil generates a magnetic field that attracts the armature and trips the circuit breaker, disconnecting the contacts and cutting off the power supply, thus protecting the person who has been electrocuted.
[0031] To test the leakage protection function of a residual current device (RCD) without leakage, the RCD is generally equipped with a "TEST" button. When this button is pressed, a portion of the current on the L line flows through the button and resistor to the N line. This causes the currents flowing through the two wires inside the E1 coil to become unequal (I2 > I1). The E1 coil generates an electromotive force, and current flows through the E2 coil, causing the armature to trip and disconnect the internal contacts. If the test button cannot be closed or the resistor is open, the RCD will not trip during the test, but it will trip during actual use if leakage occurs.
[0032] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A non-power-off detection type residual current device, characterized in that: It includes a circuit breaker body, a residual current protection module and a base plate. The circuit breaker body is fixedly mounted on the base plate, and the base plate is equipped with a guide rail. The residual current protection module is slidably mounted on the guide rail. A test button is provided on the front side of the leakage current protection module, and a baffle is provided on the circuit breaker body; when the circuit breaker body and the leakage current protection module are assembled, the test button is placed under the baffle, and the leakage current protection module can drive the circuit breaker body to trip through the mechanical interlocking mechanism. The leakage protection module moves along the guide rail until the test button is exposed from the baffle, at which point the mechanical interlock mechanism is in the disengaged state.
2. The non-power-off detection type residual current device as described in claim 1, characterized in that: The guide rail is provided with a limit block. When the leakage protection module is in contact with the limit block, the test button is exposed and the mechanical interlocking mechanism is in the off state.
3. The non-power failure detection type leakage current protection device as described in claim 1, characterized in that: The circuit breaker body has slots at the top and bottom, and the leakage protection module has fasteners at the top and bottom. When the circuit breaker body and the leakage protection module are assembled, the fasteners can be fastened onto the slots.
4. A non-power-off detection type residual current device as described in claim 1, characterized in that: The circuit breaker body and the leakage protection module are provided with several matching positioning posts and positioning holes on opposite sides.
5. A non-power-off detection type residual current device as described in claim 1, characterized in that: A power cord, which is a spring wire, is connected between the circuit breaker body and the leakage protection module.