CN115877261A - Detection circuit and system for disconnection of insulated grounding wire - Google Patents
Detection circuit and system for disconnection of insulated grounding wire Download PDFInfo
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Abstract
The application provides a detection circuit and a detection system for the disconnection of an insulated grounding wire, wherein the circuit comprises an insulated voltage detection module, an alarm detection module and a controller, the insulated voltage detection module is used for being electrically connected with a high-voltage positive terminal of a circuit to be detected, a high-voltage negative terminal of the circuit to be detected and a grounding terminal of the circuit to be detected respectively, and the insulated voltage detection module is used for detecting the insulated voltage of the circuit to be detected; the alarm detection module is respectively electrically connected with the high-voltage positive terminal of the circuit to be detected, the high-voltage negative terminal of the circuit to be detected and the grounding terminal of the circuit to be detected, and is used for detecting whether the circuit to be detected can alarm or not; the controller is respectively electrically connected with the insulation voltage detection module and the alarm detection module, and the controller is used for determining whether the grounding end of the circuit to be detected is disconnected according to the insulation voltage. Thereby the problem that the existing scheme can not detect that the grounding wire is disconnected is solved.
Description
Technical Field
The application relates to a circuit detection technology, in particular to a detection circuit and a detection system for disconnection of an insulated grounding wire.
Background
Any point of a positive bus and a negative bus of the high-voltage direct-current system is grounded, so that insulation resistance is reduced, malfunction of a protective relay is caused, and the high-voltage direct-current system fails. In order to prevent the increase of the ground fault occurrence rate of the hvdc system, the research on the insulation detection method of the hvdc system is also receiving more and more attention. The high-voltage direct current system is detected safely, in real time and accurately, and the method has important significance for ensuring the safety of personnel and the normal work of electrical equipment.
The existing scheme can only detect the disconnection of the positive pole and the negative pole of the bus, but cannot detect the disconnection of the grounding wire.
Disclosure of Invention
The main objective of the present application is to provide a detection circuit and a system for detecting a disconnection of an insulated ground wire, so as to solve the problem that the existing scheme cannot detect the disconnection of the ground wire.
According to one aspect of the embodiment of the invention, the circuit comprises an insulation voltage detection module, an alarm detection module and a controller, wherein the insulation voltage detection module is used for being electrically connected with a high-voltage positive terminal of a circuit to be detected, a high-voltage negative terminal of the circuit to be detected and a grounding terminal of the circuit to be detected respectively; the alarm detection module is electrically connected with the high-voltage positive end of the circuit to be detected, the high-voltage negative end of the circuit to be detected and the grounding end of the circuit to be detected respectively, and is used for detecting whether the circuit to be detected can alarm or not; the controller is respectively electrically connected with the insulation voltage detection module and the alarm detection module, and is used for determining whether the grounding end of the circuit to be detected is disconnected according to the insulation voltage.
Optionally, the insulation voltage detection module includes: the first end of the first relay is electrically connected with the first end of the first resistance module, the second end of the first resistance module, the first end of the fourth resistance module and the first end of the sixth resistance module are respectively electrically connected with the high-voltage negative end of the circuit to be detected, the first end of the second resistance module and the first end of the fifth resistance module are respectively electrically connected with the high-voltage positive end of the circuit to be detected, the second end of the fifth resistance module is electrically connected with the second end of the sixth resistance module, the second end of the fourth resistance module is electrically connected with the first end of the third resistance module, the second end of the first relay, the second end of the third resistance module and the second end of the second resistance module are respectively electrically connected with the grounding end of the circuit to be detected, and the first relay is further electrically connected with the controller.
Optionally, the alarm detection module includes: the first end of the seventh resistance module is electrically connected with the high-voltage positive end of the circuit to be detected, the first end of the eighth resistance module is electrically connected with the high-voltage negative end of the circuit to be detected, the second end of the seventh resistance module is electrically connected with the first end of the second relay, the second end of the eighth resistance module is electrically connected with the first end of the third relay, the second end of the third relay and the second end of the second relay are respectively electrically connected with the grounding end of the circuit to be detected, and the second relay and the third relay are respectively and electrically connected with the controller.
Optionally, the controller is configured to perform the steps of: acquiring the insulation voltage of the circuit to be detected at a first moment to obtain a first insulation voltage; obtaining the insulation voltage of the circuit to be detected at a second moment to obtain a second insulation voltage, wherein the second moment is behind the first moment; and determining whether the grounding end of the circuit to be detected is disconnected or not according to the first insulation voltage and the second insulation voltage.
Optionally, determining whether the ground terminal of the circuit to be detected is disconnected according to the first insulation voltage and the second insulation voltage, including: and under the condition that the first insulation voltage is different from the second insulation voltage, determining that the grounding end of the circuit to be detected is not disconnected.
Optionally, the controller is further configured to perform the steps of: and under the condition that the first insulation voltage is the same as the second insulation voltage, determining that the grounding end of the circuit to be detected is disconnected.
Optionally, the circuit further includes an alarm electrically connected to the controller, and after determining that the ground terminal of the circuit to be tested is disconnected, the controller is further configured to perform the following steps: controlling the second relay to close; and under the condition that the total resistance of the first equivalent resistance module and the seventh resistance module is reduced, controlling the alarm to give an alarm, wherein the first equivalent resistance module is used for representing the resistance of a load of the circuit to be detected from the high-voltage positive electrode end of the circuit to be detected to the grounding end of the circuit to be detected.
Optionally, the circuit further includes an alarm electrically connected to the controller, and after determining that the ground terminal of the circuit to be tested is disconnected, the controller is further configured to perform the following steps; controlling the third relay to close; and under the condition that the total resistance of the second equivalent resistance module and the eighth resistance module is reduced, controlling the alarm to give an alarm, wherein the second equivalent resistance module is used for representing the resistance of the load from the high-voltage negative end of the circuit to be detected to the grounding end of the circuit to be detected.
Optionally, the first time is used to represent a time corresponding to a case where the first relay is open, and the second time is used to represent a time corresponding to a case where the first relay is closed.
According to another aspect of the embodiments of the present invention, a system for detecting a disconnection of an insulated ground wire is further provided, and the system includes any one of the detection circuits for detecting a disconnection of an insulated ground wire.
In the embodiment of the invention, whether the grounding end of the circuit to be detected is disconnected or not is determined by the controller according to the insulation voltage, so that the problem that the grounding wire disconnection cannot be detected by the conventional scheme is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 shows a circuit diagram of a detection circuit for an insulated ground wire being dropped according to an embodiment of the present application;
fig. 2 shows an equivalent circuit diagram of a detection circuit of an insulated ground wire being disconnected according to an embodiment of the application;
fig. 3 shows a circuit diagram of a detection circuit for a dropped insulated ground line of multiple high voltage sources according to an embodiment of the present application.
Wherein the figures include the following reference numerals:
100. an insulation voltage detection module; 200. alarm detection module.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As mentioned in the background art, the existing scheme can only detect the disconnection of the positive electrode and the negative electrode of the bus, but cannot detect the disconnection of the ground wire, and in order to solve the problem that the existing scheme cannot detect the disconnection of the ground wire, a typical embodiment of the present application provides a detection circuit and a detection system for the disconnection of the insulated ground wire.
The application provides a detection circuit for the disconnection of an insulated grounding wire, as shown in figure 1, the circuit comprises an insulated voltage detection module 100, an alarm detection module 200 and a controller, wherein the insulated voltage detection module 100 is used for being electrically connected with a high-voltage positive terminal ZJ of a circuit to be detected, a high-voltage negative terminal FJ of the circuit to be detected and a grounding terminal PE of the circuit to be detected respectively, and the insulated voltage detection module 100 is used for detecting the insulated voltage of the circuit to be detected; the alarm detection module 200 is respectively electrically connected with the high-voltage positive terminal ZJ of the circuit to be detected, the high-voltage negative terminal FJ of the circuit to be detected and the grounding terminal PE of the circuit to be detected, and the alarm detection module 200 is used for detecting whether the circuit to be detected can alarm or not; the controller is electrically connected to the insulation voltage detection module 100 and the alarm detection module 200, and the controller is configured to determine whether the ground terminal PE of the circuit to be tested is disconnected according to the insulation voltage. Fig. 1 does not show the controller, and only shows the insulation voltage detection module 100 and the alarm detection module 200.
In the circuit, whether the grounding end of the circuit to be detected is disconnected or not is determined by the controller according to the insulation voltage, so that the problem that the grounding wire disconnection cannot be detected by the conventional scheme is solved.
If PE does not drop, according to the knowledge of circuity-ohm law, the insulation voltage detection module mentioned in the application can be used for calculating the insulation resistance value. Whether the insulation resistance meets the requirements or not can be judged according to the insulation resistance value and the relevant standard, and if the PE is not disconnected, whether the insulation meets the requirements or not is verified again according to the alarm detection module. If the PE is not disconnected, whether the insulation resistance value meets the requirement can be judged twice according to the insulation voltage detection module and the alarm detection module; and if the insulation voltage detection module and the alarm detection module cannot obtain the insulation resistance value to judge the insulation state of the circuit, the PE is considered to be disconnected.
In one embodiment of the present application, as shown in fig. 1, the insulation voltage detection module 100 includes a first resistor module R5, a first relay K3, a second resistor module R6, a third resistor module R7, a fourth resistor module R8, a fifth resistor module R9 (a fourth resistor module R8, a fifth resistor module R9: a large voltage to be obtained by a circuit based on a voltage collected by a small resistor and obtained by a voltage division principle based on a voltage collected by a small resistor) and a sixth resistor module R10, the first end of the first relay K3 is electrically connected to the first end of the first resistor module R5, the second end of the first resistor module R5, the first end of the fourth resistor module R8, and the first end of the sixth resistor module R10 are electrically connected to a high-voltage negative terminal FJ of the circuit to be tested, the first end of the second resistor module R6 and the first end of the fifth resistor module R9 are electrically connected to a high-voltage positive terminal ZJ of the circuit to be tested, the second terminal ZJ of the circuit to be tested is electrically connected to the sixth resistor module R9, the second terminal of the sixth resistor module R10 is electrically connected to a high-voltage positive terminal ZJ of the circuit to be tested, the second terminal of the circuit to be tested, and the second resistor module R3 are electrically connected to the second terminal R7, and the second terminal of the third resistor module R7 are electrically connected to the ground of the resistor module R3, and the second resistor module R8 are electrically connected to the ground. The power supply end of the first relay is electrically connected with the controller.
In an embodiment of the present application, as shown in fig. 1, the alarm detection module 200 includes a seventh resistor module R3, an eighth resistor module R4, a second relay K1 and a third relay K2, a first end of the seventh resistor module R3 is electrically connected to the high-voltage positive terminal ZJ of the circuit to be detected, a first end of the eighth resistor module R4 is electrically connected to the high-voltage negative terminal FJ of the circuit to be detected, a second end of the seventh resistor module R3 is electrically connected to the first end of the second relay K1, a second end of the eighth resistor module R4 is electrically connected to the first end of the third relay K2, a second end of the third relay K2 and a second end of the second relay K1 are electrically connected to the ground terminal PE of the circuit to be detected, and the second relay K1 and the third relay K2 are also electrically connected to the controller. The power supply end of the second relay and the power supply end of the third relay are electrically connected with the controller respectively.
And the controller controls the K1 to be opened and closed periodically, if the controller can detect the insulation fault periodically, the PE is considered not to be disconnected, otherwise, the PE is disconnected.
Before K3 is closed, U1 is the voltage across R8, i.e. the above-mentioned insulation voltage, and U2 is the voltage across R10.
After K3 is closed, U1 'is the voltage across R8, i.e. the above-mentioned insulation voltage, and U2' is the voltage across R10.
Before K3 is closed, formula one:
(((U2×(R10+R9)/R10)－(U1×(R8+R7)/R8))×((1/R6)+(1/R1)))＝(U1/R8)+(U1×(R7+R8))/(R8×R2)；
after K3 closes, equation two:
(U1'×(R8+R7)/(R5×R8))+(U1'/R8)+(U1'×(R7+R8)/(R8×R2))＝((U2'×(R10+R9)/R10)+(U1'×(R7+R8)/R8))×((1/R6)+(1/R1))；
the formula I and the formula II form a linear equation system of two elements, and the expression can be solved:
R1＝－1/(1/R6－(R7×R10×U1×U1’+R8×R10×U1×U1’)/(R5×R8×R9×U1×U2’－R5×R8×R9×U2×U1’+R5×R8×R10×U1×U2’－R5×R8×R10×U2×U1’))；
R2＝(R5×R8 2 ×R9×U1×U2’－R5×R8 2 ×R9×U2×U1’+R5×R8 2 ×R10×U1×U2’
－ R5×R8 2 ×R10×U2×U1’+R5×R7×R8×R9×U1×U2’ －R5×R7×R8×R9×U2×U1’+R5×R7×R8×R10×U1×U2’ －R5×R7×R8×R10×U2×U1’)/(R8 2 ×R9×U2×U1’－R8 2 ×R10×U1×U1’－R7 2 ×R10×U1×U1’+R8 2 ×R10×U2×U1’－2×R7×R8×R10×U1×U1’－R5×R8×R9×U1×U2’+R5×R8×R9×U2×U1’－R5×R8×R10×U1×U2’+R5×R8×R10×U2×U1’+R7×R8×R9×U2×U1’+R7×R8×R10×U2×U1’)；
and the smaller value of the insulation resistance detected by the positive ground of the bus and the negative ground of the bus is used as the resistance value of the insulation detection of the system. The insulation detection is generally greater than 100 Ω/V, and when the calculated first equivalent resistance R1 and second equivalent resistance R2 shown in fig. 2 cannot satisfy the condition, the controller reports an insulation fault.
When the PE is disconnected, K3 is closed, R5 cannot be connected into the circuit, and the insulation resistance of the circuit cannot be normally calculated when the K3 is opened and closed.
Similarly, K3 is always on or off, i.e., U1= U1'. Therefore, when the switch K3 is detected, U1= U1', the insulation is lost.
Under the condition that the first equivalent resistance R1 and the second equivalent resistance R2 are less than or equal to 100 omega, and U1= U1', the controller reports an insulation fault, namely PE is disconnected.
In an embodiment of the present application, the controller is configured to perform the following steps: acquiring the insulation voltage of the circuit to be detected at a first moment to obtain a first insulation voltage; obtaining the insulation voltage of the circuit to be detected at a second moment to obtain a second insulation voltage, wherein the second moment is positioned behind the first moment; and determining whether the grounding end of the circuit to be detected is disconnected or not according to the first insulation voltage and the second insulation voltage.
In an embodiment of the present application, determining whether the ground terminal of the circuit to be tested is disconnected according to the first insulation voltage and the second insulation voltage includes: and determining that the grounding end of the circuit to be detected is not disconnected under the condition that the first insulation voltage is different from the second insulation voltage. I.e. to indicate that the circuit to be tested is normal.
In an embodiment of the present application, the controller further performs the following steps: and determining that the grounding end of the circuit to be detected is disconnected under the condition that the first insulation voltage is the same as the second insulation voltage. The controller is required to report an insulation fault.
In an embodiment of the present application, the circuit further includes an alarm, the alarm is electrically connected to the controller, and after determining that the ground terminal of the circuit to be tested is disconnected, the controller further executes the following steps: controlling the second relay to be closed; and under the condition that the total resistance of the first equivalent resistance module and the seventh resistance module is reduced, controlling the alarm to give an alarm, wherein the first equivalent resistance module is used for representing the resistance of the load of the circuit to be detected from the high-voltage positive electrode end of the circuit to be detected to the grounding end of the circuit to be detected, and the first equivalent resistance R1 is shown in figure 2.
In an embodiment of the present application, the circuit further includes an alarm, the alarm is electrically connected to the controller, and the controller is further configured to perform the following steps after determining that the ground terminal of the circuit to be tested is disconnected; controlling the third relay to be closed; and under the condition that the total resistance of the second equivalent resistor module and the eighth resistor module is reduced, controlling the alarm to give an alarm, wherein the second equivalent resistor module is used for representing the resistance of the load from the high-voltage negative end of the circuit to be detected to the grounding end of the circuit to be detected, and the second equivalent resistor R2 is shown in fig. 2.
In one embodiment of the present application, the first time is used to indicate a time corresponding to a case where the first relay is open, and the second time is used to indicate a time corresponding to a case where the first relay is closed.
The application also provides a detection system for the disconnection of the insulated grounding wire, and the system comprises any one of the detection circuits for the disconnection of the insulated grounding wire. The controller determines whether the grounding end of the circuit to be detected is disconnected according to the insulation voltage, so that the problem that the grounding wire is disconnected cannot be detected in the conventional scheme is solved.
The application also provides a detection circuit for the disconnection of the insulated grounding wire of the multiple high-voltage sources, as shown in fig. 3, the circuit comprises a third resistor R3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R9, a ninth resistor R9 and a first relay K1, the connection mode is as shown in fig. 3, and details are omitted here, wherein ZJA is a first high-voltage positive terminal of the circuit to be detected, ZJB is a second high-voltage positive terminal of the circuit to be detected, FJ is a high-voltage negative terminal of the circuit to be detected, PE is a grounding terminal of the circuit to be detected, a first equivalent resistor R1 is used for representing the resistance of the load of the circuit to be detected from the first high-voltage positive terminal ZJB of the circuit to be detected to the grounding terminal PE of the circuit to be detected, a second equivalent resistor R2 is used for representing the resistance of the load of the circuit to be detected from the second high-voltage positive terminal ZJB of the circuit to be detected to the grounding terminal of the circuit to be detected, and a third equivalent resistor R4 is used for representing the resistance of the load of the circuit to be detected from the high-voltage positive terminal of the circuit to be detected.
Note: r8, R9 and PE are irrelevant.
1/R 2a ＝(1/R2)+(1/R3)，R 2a Is a fourth equivalent resistance, R 1a ＝R1，R 1a Is a third equivalent resistance, 1/R 4a ＝1/(R6+R7)+(1/R4)，R 4a Is a fifth equivalent resistance.
R 5a Is the resistance between the negative terminal and PE after K1 is closed, PE to the voltage negative terminal before the relay is closed, wherein R3, R5, R6, R7 are known resistors, U pe Is K1 open, the resistance between the negative terminal and PE, U' pe K1 is closed, the resistance between the negative end and the PE, and the insulation resistance R of the circuit to be detected, 1/R =1/R1+1/R2+1/R4. That is, R here satisfies the requirement, and R1, R2, R4 insulation resistance values certainly satisfy the requirement, because R1>R，R2>R，R4>R, the principle that the more and less the resistance. If PE is dropped, then it is 0, so the insulation resistance of the whole circuit will be infinite. For example, the resistance of normal insulation detection (i.e. the first equivalent resistance, the second equivalent resistance and the third equivalent resistance) is 1000 Ω/V, and if 10000 Ω/V is detected, PE is considered to be dropped.
Therefore, in the multi-high voltage source insulation detection circuit, if the voltages from the negative electrode of the voltage source to the PE detected twice are equal, namely U pe ＝U' pe And if the resistance of the insulation detection is infinite, the PE is considered to be disconnected.
It should be noted that the electrical connection may be a direct electrical connection or an indirect electrical connection, where a direct electrical connection means that two devices are directly connected, and an indirect electrical connection means that other devices such as a capacitor and a resistor are connected between a and B that are connected.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.
From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:
1) The detection circuitry that insulating earth connection dropped wire of this application, whether the earthing terminal of confirming above-mentioned circuit of waiting to examine through the controller according to insulation voltage drops and is dropped wire to the problem that current scheme can't detect the earth connection and drop wire has been solved.
2) The detection system for the disconnection of the insulated grounding wire determines whether the grounding end of the circuit to be detected is disconnected or not according to the insulation voltage through the controller, so that the problem that the disconnection of the grounding wire cannot be detected by the existing scheme is solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A detection circuit for detecting disconnection of an insulated grounding wire is characterized by comprising:
the insulation voltage detection module is used for being electrically connected with a high-voltage positive end of a circuit to be detected, a high-voltage negative end of the circuit to be detected and a grounding end of the circuit to be detected respectively, and the insulation voltage detection module is used for detecting the insulation voltage of the circuit to be detected;
the alarm detection module is electrically connected with the high-voltage positive end of the circuit to be detected, the high-voltage negative end of the circuit to be detected and the grounding end of the circuit to be detected respectively, and is used for detecting whether the circuit to be detected can alarm or not;
and the controller is respectively electrically connected with the insulation voltage detection module and the alarm detection module, and is used for determining whether the grounding end of the circuit to be detected is disconnected according to the insulation voltage.
2. The circuit of claim 1, wherein the isolation voltage detection module comprises: the first end of the first relay is electrically connected with the first end of the first resistance module, the second end of the first resistance module, the first end of the fourth resistance module and the first end of the sixth resistance module are respectively electrically connected with the high-voltage negative end of the circuit to be detected, the first end of the second resistance module and the first end of the fifth resistance module are respectively electrically connected with the high-voltage positive end of the circuit to be detected, the second end of the fifth resistance module is electrically connected with the second end of the sixth resistance module, the second end of the fourth resistance module is electrically connected with the first end of the third resistance module, the second end of the first relay, the second end of the third resistance module and the second end of the second resistance module are respectively electrically connected with the grounding end of the circuit to be detected, and the first relay is further electrically connected with the controller.
3. The circuit of claim 2, wherein the alarm detection module comprises: the first end of the seventh resistance module is electrically connected with the high-voltage positive end of the circuit to be detected, the first end of the eighth resistance module is electrically connected with the high-voltage negative end of the circuit to be detected, the second end of the seventh resistance module is electrically connected with the first end of the second relay, the second end of the eighth resistance module is electrically connected with the first end of the third relay, the second end of the third relay and the second end of the second relay are respectively electrically connected with the grounding end of the circuit to be detected, and the second relay and the third relay are respectively and electrically connected with the controller.
4. The circuit of claim 3, wherein the controller is configured to perform the steps of:
acquiring the insulation voltage of the circuit to be detected at a first moment to obtain a first insulation voltage;
obtaining the insulation voltage of the circuit to be detected at a second moment to obtain a second insulation voltage, wherein the second moment is positioned behind the first moment;
and determining whether the grounding end of the circuit to be detected is disconnected or not according to the first insulation voltage and the second insulation voltage.
5. The circuit of claim 4, wherein determining whether the ground terminal of the circuit to be inspected is disconnected according to the first isolation voltage and the second isolation voltage comprises:
and under the condition that the first insulation voltage is different from the second insulation voltage, determining that the grounding end of the circuit to be detected is not disconnected.
6. The circuit of claim 4, wherein the controller is further configured to perform the steps of:
and under the condition that the first insulation voltage is the same as the second insulation voltage, determining that the grounding end of the circuit to be detected is disconnected.
7. The circuit of claim 5, further comprising an alarm electrically connected to the controller, wherein after determining that the ground terminal of the circuit to be tested is disconnected, the controller is further configured to perform the following steps:
controlling the second relay to close;
and under the condition that the total resistance of the first equivalent resistance module and the seventh resistance module is reduced, controlling the alarm to give an alarm, wherein the first equivalent resistance module is used for representing the resistance of the load of the circuit to be detected from the high-voltage positive end of the circuit to be detected to the grounding end of the circuit to be detected.
8. The circuit of claim 5, further comprising an alarm electrically connected to the controller, wherein the controller is further configured to perform the following steps after determining that the ground terminal of the circuit to be tested is disconnected;
controlling the third relay to close;
and under the condition that the total resistance of the second equivalent resistance module and the eighth resistance module is reduced, controlling the alarm to give an alarm, wherein the second equivalent resistance module is used for representing the resistance of the load from the high-voltage negative end of the circuit to be detected to the grounding end of the circuit to be detected.
9. The circuit of any one of claims 4 to 8, wherein the first time is indicative of a time when the first relay is open and the second time is indicative of a time when the first relay is closed.
10. A system for detecting a disconnection of an insulated grounding wire, comprising the circuit for detecting a disconnection of an insulated grounding wire according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211377690.3A CN115877261A (en) | 2022-11-04 | 2022-11-04 | Detection circuit and system for disconnection of insulated grounding wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211377690.3A CN115877261A (en) | 2022-11-04 | 2022-11-04 | Detection circuit and system for disconnection of insulated grounding wire |
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| Publication Number | Publication Date |
|---|---|
| CN115877261A true CN115877261A (en) | 2023-03-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211377690.3A Withdrawn CN115877261A (en) | 2022-11-04 | 2022-11-04 | Detection circuit and system for disconnection of insulated grounding wire |
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| Country | Link |
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| CN (1) | CN115877261A (en) |
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Application publication date: 20230331 |