CN219657794U - Insulation detection device of direct current system - Google Patents
Insulation detection device of direct current system Download PDFInfo
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- CN219657794U CN219657794U CN202320207407.6U CN202320207407U CN219657794U CN 219657794 U CN219657794 U CN 219657794U CN 202320207407 U CN202320207407 U CN 202320207407U CN 219657794 U CN219657794 U CN 219657794U
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- current voltage
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- 238000009413 insulation Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides an insulation detection device of a direct current system, which comprises a first direct current voltage detector for monitoring the voltage to ground of a positive bus, a second direct current voltage detector for monitoring the voltage to ground of a negative bus, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay and an alarm, wherein: the first direct current voltage detector is electrically connected with coils of the first intermediate relay and the second intermediate relay respectively; the second direct-current voltage detector is respectively and electrically connected with coils of the third intermediate relay and the fourth intermediate relay so as to respectively control the coils of the third intermediate relay and the fourth intermediate relay to be electrified or powered off according to the grounding voltage of the negative bus; one end of the alarm is connected with the zero line, and the other end of the alarm is connected with the live line through normally open contacts of the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively. The device provided by the utility model effectively solves the problems of missing report and poor stability.
Description
Technical Field
The utility model relates to the technical field of insulation detection of direct current systems, in particular to an insulation detection device of a direct current system.
Background
The direct current system is extremely important in the whole power grid, and the direct current system normally provides a reliable direct current power supply for control signals, relay protection, automatic devices and switching-on and switching-off operation loops, and if the direct current system is in poor insulation, protection misoperation or refusal operation can be caused, and when serious, the direct current system is possibly short-circuited, so that a power supply hub cannot maintain continuous and stable operation of the power system. Therefore, in the prior art, a set of insulation monitoring device is installed for the dc system to monitor the insulation condition of the dc system, so as to monitor the working condition of the dc system.
However, the insulation monitoring device in the prior art has the defects of missing report, poor stability and the like, and cannot accurately and effectively monitor the working condition of the direct current system.
Disclosure of Invention
The utility model provides an insulation detection device for a direct current system, which aims at the problems existing in the prior art.
The utility model provides an insulation detection device of a direct current system, which comprises a first direct current voltage detector for monitoring the grounding voltage of a positive bus, a second direct current voltage detector for monitoring the grounding voltage of a negative bus, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay and an alarm, wherein:
the first direct current voltage detector is respectively and electrically connected with coils of the first intermediate relay and the second intermediate relay so as to respectively control the coils of the first intermediate relay and the second intermediate relay to be electrified or powered off according to the voltage of the positive bus to the ground;
the second direct-current voltage detector is respectively and electrically connected with coils of the third intermediate relay and the fourth intermediate relay so as to respectively control the coils of the third intermediate relay and the fourth intermediate relay to be electrified or powered off according to the grounding voltage of the negative bus;
one end of the alarm is connected with the zero line, and the other end of the alarm is connected with the live line through normally open contacts of the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively.
Further, one end of the first intermediate relay coil is connected with a first terminal of the first direct-current voltage detector, and the other end of the first intermediate relay coil is connected with a zero-line connecting terminal of the first direct-current voltage detector;
one end of a coil of the second intermediate relay is connected with a second terminal of the first direct-current voltage detector, and the other end of the coil of the second intermediate relay is connected with a zero-line wiring terminal of the first direct-current voltage detector;
one end of a coil of the third intermediate relay is connected with a first terminal of the second direct-current voltage detector, and the other end of the coil of the third intermediate relay is connected with a zero-line connecting terminal of the second direct-current voltage detector;
one end of a coil of the fourth intermediate relay is connected with a second terminal of the second direct-current voltage detector, and the other end of the coil of the fourth intermediate relay is connected with a zero-line connecting terminal of the second direct-current voltage detector;
further, the first terminal and the second terminal of the first direct current voltage detector are connected with the third terminal of the first direct current voltage detector through the first switch and the second switch respectively, and the third terminal of the first direct current voltage detector is also connected with the live wire wiring terminal of the first direct current voltage detector.
Further, the first terminal and the second terminal of the second direct current voltage detector are connected with the third terminal of the second direct current voltage detector through a third switch and a fourth switch respectively, and the third terminal of the second direct current voltage detector is also connected with the live wire wiring terminal of the second direct current voltage detector.
Further, the alarm is an audible and visual alarm.
Further, RS485 serial interfaces are arranged on the first direct-current voltage detector and the second direct-current voltage detector.
Further, the device also comprises a fuse, one end of the fuse is connected with the live wire, and the other end of the fuse is connected with the alarm through normally open contacts of the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively.
According to the insulation detection device for the direct current system, the direct current voltage detectors are additionally arranged on the positive electrode and the negative electrode of the direct current system respectively, the voltage of the bus of the direct current system to the ground is accurately monitored, when the voltage detected is higher or lower than the allowable range value set by a user, one group of direct current voltage detectors outputs a high report, the other group of direct current voltage detectors outputs a low report, the function of simultaneous alarm of the high report and the low report is achieved, the function of redundancy design of alarm output is achieved, and therefore the problems of missing report and poor stability are effectively solved.
Drawings
For a clearer description of embodiments of the utility model or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a DC system insulation detection device according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a DC system insulation detection device according to another embodiment of the present utility model;
1-a first direct current voltage detector, 2-a second direct current voltage detector and 3-an alarm.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In one embodiment of the present utility model, as shown in fig. 1, the present utility model provides a dc system insulation detection device, which includes a first dc voltage detector 1 for monitoring a positive bus voltage to ground, a second dc voltage detector 2 for monitoring a negative bus voltage to ground, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, and an alarm 3, wherein:
the first direct current voltage detector 1 is electrically connected with coils of the first intermediate relay KA1 and the second intermediate relay KA2 respectively so as to control the coils of the first intermediate relay KA1 and the second intermediate relay KA2 to be electrified or powered off respectively according to the voltage of the positive bus to the ground; the second direct-current voltage detector 2 is respectively and electrically connected with coils of the third intermediate relay KA3 and the fourth intermediate relay KA4 so as to respectively control the coils of the third intermediate relay KA3 and the fourth intermediate relay KA3 to be electrified or powered off according to the grounding voltage of the negative bus;
one end of the alarm 3 is connected with a zero line, and the other end of the alarm is connected with a live line through normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3 and the fourth intermediate relay KA4 respectively.
Specifically, the first direct-current voltage detector 1 and the second direct-current voltage detector 2 are provided with a voltage detection circuit and a controller, and the controller controls the power-on and power-off of the coils. The voltage detection circuit can be implemented by adopting a voltage detection circuit in the prior art, and the utility model is not limited to the voltage detection circuit.
The working process of the insulation detection device of the direct current system provided by the utility model is as follows: the first direct current voltage detector 1 detects the voltage to the ground of the positive bus and compares the voltage value with a preset highest voltage threshold value and a preset lowest voltage threshold value, if the voltage value is larger than the preset highest voltage threshold value, the coil of the first intermediate relay KA1 is controlled to be electrified, and if the voltage value is smaller than the preset lowest voltage threshold value, the coil of the second intermediate relay KA2 is controlled to be electrified; the second direct current voltage detector 2 detects the voltage to the ground of the negative bus and compares the voltage value with a preset highest voltage threshold value and a preset lowest voltage threshold value, if the voltage value is larger than the preset highest voltage threshold value, the coil of the third intermediate relay KA3 is controlled to be electrified, and if the voltage value is smaller than the preset highest voltage threshold value, the coil of the fourth intermediate relay KA4 is controlled to be electrified; after the coils of the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3 or the fourth intermediate relay KA4 are electrified, normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3 or the fourth intermediate relay KA4 are closed, and an alarm is electrified to alarm, so that insulation abnormality of a direct current system of a worker is reminded.
Because the direct current system is an insulating system, the insulation resistance of the positive electrode and the negative electrode to the ground is equal during normal, the voltages of the positive electrode and the negative electrode to the ground are balanced, when a point of grounding occurs, the voltages of the positive electrode and the negative electrode to the ground are changed, the voltages of the ground electrode are reduced, and the voltages of the non-ground electrode are increased.
Further, one end of a coil of the first intermediate relay KA1 is connected with a first terminal of the first direct current voltage detector 1, and the other end of the coil of the first intermediate relay KA1 is connected with a zero line connecting terminal of the first direct current voltage detector;
one end of a coil of the second intermediate relay KA2 is connected with a second terminal of the first direct-current voltage detector 1, and the other end of the coil of the second intermediate relay KA2 is connected with a zero-line connecting terminal of the first direct-current voltage detector 1;
one end of a coil of the third intermediate relay KA3 is connected with a first terminal of the second direct-current voltage detector 2, and the other end of the coil of the third intermediate relay KA3 is connected with a zero line connecting terminal of the second direct-current voltage detector 2;
one end of a coil of the fourth intermediate relay KA4 is connected with a second terminal of the second direct-current voltage detector 2, and the other end of the coil of the fourth intermediate relay KA4 is connected with a zero line connecting terminal of the second direct-current voltage detector 2;
further, the first terminal and the second terminal of the first direct current voltage detector 1 are connected with the third terminal of the first direct current voltage detector 1 through the first switch AH1 and the second switch AL2 respectively, and the third terminal of the first direct current voltage detector is also connected with the live wire wiring terminal of the first direct current voltage detector.
Further, the first terminal and the second terminal of the second dc voltage detector 2 are connected to the third terminal of the second dc voltage detector 2 through the third switch AH3 and the fourth switch AL4, respectively, and the third terminal of the second dc voltage detector 2 is also connected to the live wire connection terminal of the second dc voltage detector 2.
Further, in yet another embodiment of the present utility model, the alarm is an audible and visual alarm. Therefore, the alarm device can effectively alarm staff, and achieves a better alarm effect.
Further, in still another embodiment of the present utility model, RS485 serial interfaces are provided on the first dc voltage detector 1 and the second dc voltage detector 2. The first direct-current voltage detector and the second direct-current voltage detector can realize data communication with the upper computer terminal equipment through the RS485 serial interface, and then detected voltage data are sent to the upper computer terminal equipment, so that the running stability of a direct-current system is improved.
Further, in still another embodiment of the present utility model, the device further includes a fuse FU, one end of the fuse 4 is connected to the live wire, and the other end is connected to the alarm 3 through normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2, the third intermediate relay KA3, and the fourth intermediate relay KA4, respectively.
The present utility model has been further described with the aid of specific embodiments, but it should be understood that the detailed description herein should not be construed to limit the spirit and scope of the utility model. Various modifications to the above described embodiments will be apparent to those skilled in the art from a reading of the present specification, which are within the scope of the utility model.
Claims (7)
1. The utility model provides a direct current system insulation detection device, its characterized in that, the device includes the first direct current voltage detector of monitoring positive pole busbar earth voltage, monitors second direct current voltage detector, first intermediate relay, second intermediate relay, third intermediate relay, fourth intermediate relay and the alarm of negative pole busbar earth voltage, wherein:
the first direct current voltage detector is respectively and electrically connected with coils of the first intermediate relay and the second intermediate relay so as to respectively control the coils of the first intermediate relay and the second intermediate relay to be electrified or powered off according to the voltage of the positive bus to the ground;
the second direct-current voltage detector is respectively and electrically connected with coils of the third intermediate relay and the fourth intermediate relay so as to respectively control the coils of the third intermediate relay and the fourth intermediate relay to be electrified or powered off according to the grounding voltage of the negative bus;
and one end of the alarm is connected with the zero line, and the other end of the alarm is connected with the live line through normally open contacts of the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively.
2. The direct current system insulation detection device according to claim 1, wherein one end of the first intermediate relay coil is connected with a first terminal of the first direct current voltage detector, and the other end is connected with a zero line connection terminal of the first direct current voltage detector;
one end of a coil of the second intermediate relay is connected with a second terminal of the first direct-current voltage detector, and the other end of the coil of the second intermediate relay is connected with a zero-line wiring terminal of the first direct-current voltage detector;
one end of a coil of the third intermediate relay is connected with a first terminal of the second direct-current voltage detector, and the other end of the coil of the third intermediate relay is connected with a zero-line connecting terminal of the second direct-current voltage detector;
one end of a coil of the fourth intermediate relay is connected with a second terminal of the second direct-current voltage detector, and the other end of the coil of the fourth intermediate relay is connected with a zero-line connecting terminal of the second direct-current voltage detector.
3. The insulation detection device of a direct current system according to claim 2, wherein the first terminal and the second terminal of the first direct current voltage detector are respectively connected with the third terminal of the first direct current voltage detector through a first switch and a second switch, and the third terminal of the first direct current voltage detector is also connected with a live wire connection terminal of the first direct current voltage detector.
4. The insulation detection device of a direct current system according to claim 2, wherein the first terminal and the second terminal of the second direct current voltage detector are respectively connected with the third terminal of the second direct current voltage detector through a third switch and a fourth switch, and the third terminal of the second direct current voltage detector is also connected with a live wire connection terminal of the second direct current voltage detector.
5. The direct current system insulation detection device according to claim 1, wherein the alarm is an audible and visual alarm.
6. The insulation detection device of a direct current system according to claim 1, wherein the first direct current voltage detector and the second direct current voltage detector are provided with an RS485 serial interface.
7. The direct current system insulation detection device according to claim 1, further comprising a fuse, wherein one end of the fuse is connected with a live wire, and the other end of the fuse is connected with the alarm through normally open contacts of the first intermediate relay, the second intermediate relay, the third intermediate relay and the fourth intermediate relay respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320207407.6U CN219657794U (en) | 2023-02-14 | 2023-02-14 | Insulation detection device of direct current system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320207407.6U CN219657794U (en) | 2023-02-14 | 2023-02-14 | Insulation detection device of direct current system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219657794U true CN219657794U (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320207407.6U Active CN219657794U (en) | 2023-02-14 | 2023-02-14 | Insulation detection device of direct current system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219657794U (en) |
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2023
- 2023-02-14 CN CN202320207407.6U patent/CN219657794U/en active Active
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