A structure for monitoring the on-off state of grounding

Abstract

The utility model belongs to circuit monitoring technical field, concretely relates to a structure of monitoring on-off of grounding state, including first voltage division unit (1) that is connected in series between zero line and live wire, second voltage division unit (2) and signal acquisition unit (3), still including the test circuit (4) of one end connection between first voltage division unit (1) and second voltage division unit (2), the other end connection on the measured grounding point (5), signal acquisition unit (3) can give different signals to the ground wire on-off situation of measured grounding point (5). The utility model principle is simple and effective, cost is extremely low, only needs several elements to realize the monitoring of on and off of grounding situation, has the advantage that operation is reliable, and the fault rate is low.

Description

Technical Field

[0001] This utility model belongs to the field of circuit monitoring technology, specifically relating to a structure for monitoring the continuity of grounding status. Background Technology

[0002] Grounding is a crucial technical requirement for equipment lightning protection; therefore, equipment must be grounded during installation. Current grounding testing typically uses the three-electrode method to measure grounding resistance, but installing auxiliary electrodes in certain environments, such as urban buildings, is difficult. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a monitoring structure for circuits that can detect the continuity of the ground wire in a circuit through simple component installation.

[0004] To achieve the above objectives, the present invention employs a structure for monitoring the continuity of grounding status, comprising a first voltage divider unit, a second voltage divider unit, and a signal acquisition unit connected in series between the neutral wire and the live wire, and a test circuit with one end connected between the first voltage divider unit and the second voltage divider unit and the other end connected to the grounding point under test. The signal acquisition unit can provide different signals for the continuity of the ground wire at the grounding point under test.

[0005] Furthermore, the first voltage divider unit is located near the live wire, the signal acquisition unit is located near the neutral wire, and the second voltage divider unit is located between the first voltage divider unit and the signal acquisition unit.

[0006] Furthermore, the first voltage divider unit is a first resistor, the second voltage divider unit is a second resistor, the signal acquisition unit is a light-emitting diode (LED), the LED is off when the ground wire of the grounding point under test is connected, and the LED is on when the ground wire of the grounding point under test is disconnected.

[0007] Furthermore, the resistance of the first resistor is 220k ohms, and the resistance of the second resistor is one-tenth of that of the first resistor.

[0008] Furthermore, the signal acquisition unit can also be selected to use an optocoupler, a current transformer, or a resistor, and the signal acquisition unit can output different signals when the grounding state of the measured grounding point is on or off.

[0009] The beneficial effects of this utility model are as follows:

[0010] 1. The principle is simple and effective, and the cost is extremely low. Only a few components (two resistors and one light-emitting diode) are needed to monitor the continuity and disconnection of the grounding.

[0011] 2. Simple structure, few parts, reliable operation, and low failure rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a structure for monitoring the on / off state of grounding as described in a specific embodiment of this utility model;

[0013] Figure 2 This is a schematic diagram of a structure for monitoring the on / off state of grounding as described in a specific embodiment of this utility model (composed of resistor R1, resistor R2 and light-emitting diode);

[0014] In the diagram: 1-First voltage divider unit, 2-Second voltage divider unit, 3-Signal acquisition unit, 4-Test circuit, 5-Grounding point under test. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] A structure for monitoring the continuity of grounding status (see...) Figure 1 The system includes a first voltage divider unit 1, a second voltage divider unit 2, and a signal acquisition unit 3 connected in series between the neutral wire and the live wire. It also includes a test line 4 with one end connected between the first voltage divider unit 1 and the second voltage divider unit 2 and the other end connected to the grounding point 5 under test. The signal acquisition unit 3 can provide different signals depending on the continuity of the ground wire at the grounding point 5 under test.

[0017] The first voltage divider unit 1 is located near the live wire, the signal acquisition unit 3 is located near the neutral wire, and the second voltage divider unit 2 is located between the first voltage divider unit 1 and the signal acquisition unit 3.

[0018] One form of this utility model (see...) Figure 2 The following is a breakdown of the voltage divider unit: the first voltage divider unit 1 is the first resistor (R1), the second voltage divider unit 2 is the second resistor (R2), and the signal acquisition unit 3 is a light-emitting diode (LED). When the ground wire of the grounding point 5 under test is connected, the LED is off; when the ground wire of the grounding point 5 under test is disconnected, the LED lights up. When the ground wire of the grounding point 5 under test is disconnected from the ground grid, the positive half-wave of the current flows from R1 to R2 and LED, and then to the N line, thus lighting up the LED. When the ground wire of the grounding point 5 under test is connected to the ground grid, R2 and LED are "short-circuited" by the ground wire, thus turning off the LED.

[0019] The first resistor (R1) has a resistance of approximately 220kΩ, and the second resistor (R2) has a resistance of approximately one-tenth that of the first resistor (R1). This ensures that when current flows from R1, R2, and the LED circuit, the current is approximately 1mA, enough to light the LED without wasting current. When R2 has a resistance of approximately 22kΩ, the voltage divider between it and R1 outputs approximately 22V, which is lower than the safe voltage of 36V. Furthermore, when the grounding circuit is connected, it effectively breaks the current in this circuit, causing the LED to turn off. Therefore, when the LED is lit, the grounding is broken; when the LED is off, the grounding is connected, achieving the purpose of detecting grounding continuity and disconnection. The resistance values ​​of the first resistor (R1) and the second resistor (R2) can also be selected and combined with other resistance values ​​according to actual needs and technical effects.

[0020] This invention can be further expanded so that the signal acquisition unit 3 can also be selected to use components such as optocouplers, transformers or resistors. When the grounding state of the grounding point 5 under test is on or off, the signal acquisition unit 3 can output different signals for secondary development.

[0021] The device described in this utility model is not limited to the embodiments described in the specific implementation. Other implementation methods derived by those skilled in the art based on the technical solution of this utility model also fall within the scope of technical innovation of this utility model.

Claims

1. A structure for monitoring the continuity of grounding status, characterized in that: It includes a first voltage divider unit (1), a second voltage divider unit (2), and a signal acquisition unit (3) connected in series between the neutral wire and the live wire. It also includes a test circuit (4) with one end connected between the first voltage divider unit (1) and the second voltage divider unit (2) and the other end connected to the grounding point (5) under test. The signal acquisition unit (3) can provide different signals for the continuity of the ground wire at the grounding point (5) under test.

2. The structure for monitoring the continuity of grounding status as described in claim 1, characterized in that: The first voltage divider unit (1) is close to the live wire, the signal acquisition unit (3) is close to the neutral wire, and the second voltage divider unit (2) is located between the first voltage divider unit (1) and the signal acquisition unit (3).

3. The structure for monitoring the continuity of grounding status as described in claim 2, characterized in that: The first voltage divider unit (1) is a first resistor, the second voltage divider unit (2) is a second resistor, the signal acquisition unit (3) is a light-emitting diode, the light-emitting diode is off when the ground wire of the grounding point (5) under test is connected, and the light-emitting diode is lit when the ground wire of the grounding point (5) under test is disconnected.

4. The structure for monitoring the continuity of grounding status as described in claim 3, characterized in that: The first resistor has a resistance of 220k ohms, and the second resistor has a resistance of one-tenth that of the first resistor.

5. The structure for monitoring the continuity of grounding status as described in claim 4, characterized in that: The signal acquisition unit (3) can also be selected to use an optocoupler, a transformer or a resistor. The signal acquisition unit (3) can output different signals when the grounding state of the grounding point (5) under test is on or off.

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