CN215419567U - Safe power supply system - Google Patents
Safe power supply system Download PDFInfo
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- CN215419567U CN215419567U CN202121199864.2U CN202121199864U CN215419567U CN 215419567 U CN215419567 U CN 215419567U CN 202121199864 U CN202121199864 U CN 202121199864U CN 215419567 U CN215419567 U CN 215419567U
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Abstract
The utility model discloses and provides a safe power supply system which can warn and automatically handle in real time when capacity expansion and load expansion, electric leakage, electric shock and electric accidents occur and can effectively prevent the expansion and the severity of the accidents. The utility model comprises a power transformer, a power transmission line and a load, wherein the neutral point of the power transformer is not grounded, the load is electrically connected with the power transformer through the power transmission line, the power transmission line comprises a phase line, a zero line and a ground line, the phase line and the zero line are both connected with the power transformer, the utility model also comprises a zero line and ground line insulation resistance detection module and a circuit breaker connected with a control module of the zero line and ground line insulation resistance detection module, two detection ends of the zero line and ground line insulation resistance detection module are respectively connected with the zero line and the ground line, and the circuit breaker is arranged on the power transmission line; when the zero line and ground wire insulation resistance detection module detects that the insulation resistance between the zero line and the ground wire is smaller than a safety value, the circuit breaker can be driven to act immediately or in a delayed mode. The utility model is applied to the technical field of power supply systems.
Description
Technical Field
The utility model relates to a power supply grid, in particular to a safe power supply system.
Background
Today, with continuous progress of science and technology, efforts to improve, ensure and optimize the power grid system are responsible for every related person.
Careful analysis and research can find that the existing power supply system has the following defects:
at present, the common forms of power supply of the power grid are divided into three types, namely three T commonly known in the industry: in general, the IT system, the TT system and the TN system have good ground wire contact, all the systems are safe, and dangerous conditions can occur only when the ground wire contact is poor. When using a TN-S system: when the ground wire is in poor contact, the equipment is in failure, the current may flow back to the zero line through the human body and the ground wire, and if the internal resistance of the human body is 2k, the current passing through the human body is 110mA, which is enough to be fatal, so the general leakage switch is set at 30mA or below to ensure the personal safety, but the above system still has the following problems: problem 1: when the TN-S system is used, because the leakage current cannot be controlled, when the leakage occurs, the TN-S system needs to be tripped immediately, time cannot be provided for an operator to remove faults, and large-area power failure easily affects life and production. Problem 2: the problems of system moisture, aging or damage exist, and the occurrence of false triggering is easily aggravated. In summary, the existing power supply system has certain safety and economical efficiency under the condition that the power supply distance is not very long. However, if the transmission line is long and the load is increased, the safety of the power supply system with complicated leakage may be reduced due to the lack of the detection and disposal device. The improvement and completeness of existing power supply systems therefore places technical demands on the skilled person.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a safe power supply system which can warn and automatically handle in real time when capacity expansion and load expansion, electric leakage, electric shock and electric accidents occur, can effectively prevent the expansion and the severity of the accidents and ensure the personal and property safety.
The technical scheme adopted by the utility model is as follows: a safe power supply system comprises a power transformer, a power transmission line and a load, wherein a neutral point of the power transformer is not grounded, the load is electrically connected with the power transformer through the power transmission line, the power transmission line comprises a phase line, a zero line and a ground line, the phase line and the zero line are both connected with the power transformer, the safe power supply system also comprises a zero line and ground line insulation resistance detection module and a circuit breaker connected with a control module of the zero line and ground line insulation resistance detection module, two detection ends of the zero line and ground line insulation resistance detection module are respectively connected with the zero line and the ground line, and the circuit breaker is arranged on the power transmission line; when the zero line and ground wire insulation resistance detection module detects that the insulation resistance between the zero line and the ground wire is smaller than a safety value, the circuit breaker can be immediately or in delayed time driven to act, and the connection between the corresponding power transmission line and the power transformer is cut off.
Further, the safety power supply system further comprises a warning device, the warning device is connected with a control module of the zero line ground wire insulation resistance detection module, and when the zero line ground wire insulation resistance detection module detects that the insulation resistance between the zero line and the ground wire is smaller than a safety value, the zero line ground wire insulation resistance detection module controls the warning device to give out a warning.
Further, when the zero line ground wire insulation resistance detection module detects that the zero line ground wire insulation resistance is smaller than 30K omega, the warning device gives an alarm, and when the zero line ground wire insulation resistance detection module detects that the zero line ground wire insulation resistance is smaller than 6K omega, the warning device gives an alarm and the circuit breaker cuts off the circuit.
Furthermore, the warning device is a sound and light alarm device.
Further, the safety power supply system also comprises a leakage switch with a time delay tripping function, wherein the leakage switch with the time delay tripping function comprises a photoacoustic alarm connected with the leakage switch controller with the time delay tripping function; the load is connected in parallel with the power transmission line on the bus through the power transmission line on the branch line, and the electric leakage switch with the time delay tripping function is arranged on the power transmission line on the branch line; when the leakage switch with the time delay tripping function detects that the leakage exceeds the standard on the branch line where the leakage switch is positioned, the connection between the load on the branch line and the power transmission line on the bus is cut off instantly or in a time delay manner, and meanwhile, the photoacoustic alarm gives an alarm.
Further, when the leakage current detected by the leakage switch with the time delay tripping function is 3 mA-12 mA, only the audible and visual alarm prompt of the photoacoustic alarm is given, and when the alarm time of the photoacoustic alarm exceeds the set time, the tripping response is given; when the leakage switch with the time delay tripping function detects that the leakage current exceeds 12mA, tripping and power off are immediately carried out.
Further, a safe power supply system still includes zero line lead-out wire and 20K omega-31K omega's high impedance, the one end of zero line lead-out wire with the zero line electricity is connected, the other end of zero line lead-out wire with the one end electricity of high impedance is connected, the other end of high impedance with the ground wire electricity is connected, zero line lead-out wire is provided with current limiting device, current limiting device detects to flow through when the electric current of zero line lead-out wire surpasses 12mA, current limiting device cuts off and corresponds transmission line with power transformer's connection.
The utility model has the beneficial effects that: the safe power supply system comprises a power transformer, a power transmission line and a load, wherein a neutral point of the power transformer is not grounded, the load is electrically connected with the power transformer through the power transmission line, the power transmission line comprises a phase line, a zero line and a ground line, the phase line and the zero line are both connected with the power transformer, the safe power supply system also comprises a zero line and ground line insulation resistance detection module and a circuit breaker connected with a control module of the zero line and ground line insulation resistance detection module, two detection ends of the zero line and ground line insulation resistance detection module are respectively connected with the zero line and the ground line, and the circuit breaker is arranged on the power transmission line; when the zero line and ground wire insulation resistance detection module detects that the insulation resistance between the zero line and the ground wire is smaller than a safety value, the circuit breaker can be immediately or in delayed time driven to act, and the connection between the corresponding power transmission line and the power transformer is cut off. In addition, when the leakage current detected by the leakage switch with the time delay tripping function is 3 mA-12 mA, only the audible and visual alarm prompt of the photoacoustic alarm is given, and when the alarm time of the photoacoustic alarm exceeds the set time, the tripping response is given; when the leakage switch with the time delay tripping function detects that the leakage current exceeds 12mA, tripping and power off are immediately carried out. Therefore, the utility model can warn and automatically deal with the power supply system in real time when the power supply system has capacity expansion and load expansion, moist leakage, electric shock and electrical accidents, can effectively prevent the expansion and the severity of the accidents, and ensures the personal and property safety, thereby being a safe power supply system.
Drawings
Fig. 1 is a schematic diagram of the circuit connection principle of the present invention.
Detailed Description
As shown in fig. 1, a safety power supply system includes a power transformer 1, a power transmission line 2, a load 3, a neutral point of the power transformer 1 is not grounded, the load 3 is electrically connected with the power transformer 1 through the power transmission line 2, the power transmission line 2 includes a phase line L, a zero line N, a ground line G, the phase line L and the zero line N are both connected with the power transformer 1, the safety power supply system further includes a zero line and ground line insulation resistance detection module 4 and a circuit breaker 5 connected with a control module of the zero line and ground line insulation resistance detection module 4, two detection ends of the zero line and ground line insulation resistance detection module 4 are respectively connected with the zero line N and the ground line G, and the circuit breaker 5 is disposed on the power transmission line 2; when the zero line and ground wire insulation resistance detection module 4 detects that the insulation resistance between the zero line N and the ground wire G is smaller than a safety value, the circuit breaker 5 can be driven to act instantly or in a delayed mode, and connection between the corresponding power transmission line 2 and the power transformer 1 is cut off.
The safety power supply system further comprises a warning device 6, the warning device 6 is connected with a control module of the zero line ground wire insulation resistance detection module 4, and when the zero line ground wire insulation resistance detection module 4 detects that insulation resistance between the zero line N and the ground wire G is smaller than a safety value, the zero line ground wire insulation resistance detection module 4 controls the warning device 6 to give out warning.
When the zero line ground wire insulation resistance detection module 4 detects that the zero line ground wire insulation resistance is less than 30K omega, the warning device 6 gives an alarm, and when the zero line ground wire insulation resistance detection module 4 detects that the zero line ground wire insulation resistance is less than 6K omega, the warning device 6 gives an alarm and the circuit breaker 5 cuts off the circuit.
The warning device 6 is a sound and light alarm device.
The safety power supply system also comprises a residual current switch 7 with a time delay tripping function, wherein the residual current switch 7 with the time delay tripping function comprises a photoacoustic alarm 8 connected with a controller of the residual current switch 7 with the time delay tripping function; the load 3 is connected in parallel with the power transmission line 2 on the bus through the power transmission line 2 on the branch line, and the electric leakage switch 7 with the time delay tripping function is arranged on the power transmission line 2 on the branch line; when the leakage switch 7 with the time delay tripping function detects that the leakage exceeds the standard on the branch line where the leakage switch is located, the connection between the load 3 on the branch line and the power transmission line 2 on the bus is cut off instantly or in a time delay manner, and meanwhile, the photoacoustic alarm 8 gives an alarm.
When the leakage current detected by the leakage switch 7 with the time delay tripping function is 3 mA-12 mA, only the audible and visual alarm prompt of the photoacoustic alarm 8 is given, and when the alarm time of the photoacoustic alarm 8 exceeds the set time, the tripping response is given; when the leakage switch 7 with the time delay tripping function detects that the leakage current exceeds 12mA, tripping and power off are immediately carried out.
The safe power supply system further comprises a zero line outgoing line 9 and a high impedance z of 20K omega-31K omega, one end of the zero line outgoing line 9 is electrically connected with the zero line N, the other end of the zero line outgoing line 9 is electrically connected with one end of the high impedance z, the other end of the high impedance z is electrically connected with the ground wire G, the zero line outgoing line 9 is provided with a current limiting device ELCB-1, and when the current limiting device ELCB-1 detects that the current flowing through the zero line outgoing line 9 exceeds 12mA, the current limiting device ELCB-1 cuts off the connection between the corresponding power transmission line 2 and the power transformer 1.
In the embodiment, because the leakage switch comprises zero line ground wire insulation resistance detection and a circuit breaker or a delayed tripping function, a 31K omega current limiting device is connected between the zero line ground wire, if an electrical fault occurs, the current is limited to 7.3mA, the leakage switch is absolutely safe for a human body, meanwhile, a 5 mA-12 mA leakage switch with a delayed tripping function can be triggered, an audible and visual alarm is given, and the leakage switch trips after a specified time, if the leakage current exceeds 12mA, the delayed tripping function leakage switch can trip instantly, a worker can timely handle slight faults within the delay time, so that the safety power supply system is prevented from large-area sudden power failure, the safety and the economical efficiency are improved, a more convenient and reliable power supply system is provided for the work and life of people, and personal injury and property loss caused by the problem of the power supply system can be greatly reduced.
The system makes the following targeted improvement on the problems of the existing power supply system:
1. an IT wiring mode is adopted, and zero line at the primary end of the transformer is not grounded, so that return-to-zero current is prevented; the problem that the ground leakage current of the TN system cannot be controlled is solved, and the danger of partial electric fire and human electric shock is prevented.
2. A current limiting device of 31k omega is added between the zero line and the ground wire, so that the electric shock current value passing through a human body is limited to be less than 12mA, the safety is ensured, and the danger of the TN system caused by the failure of a leakage switch is solved.
3. The zero line and ground wire insulation resistance detection device gives an audible and visual alarm when the detected insulation value is lower than 30K omega, and triggers the delay leakage switch when the insulation value is lower than 6K omega to give an alarm and delay tripping, thereby solving the problem of short circuit between the zero line and the ground wire in an IT system led out by the zero line.
4. The leakage switch with the time delay function is introduced, when the leakage of a loop per se exceeds 3mA, the leakage switch gives an alarm and delays the power off, the influence of error triggering of the TN system is solved, and if the leakage value exceeds 12mA, the TN system can be immediately tripped.
5. The leakage switch with the time delay function has the function of immediate tripping when the leakage current is 12mA, and solves the problem that the leakage switch still can perform tripping protection when the zero line and the ground wire are seriously short-circuited in an IT system with the zero line led out.
6. A30 mA residual current switch which is immediately tripped by a main switch can also be introduced to be used as a final defense line.
7. A danger early warning device is introduced, when the leakage of a loop per se exceeds 5mA, the danger early warning device sends out a warning and delay power-off signal, and meanwhile, if the leakage value exceeds 12mA, the danger early warning device can immediately trip.
8. The danger early warning device is provided with a self-checking system, and self-checking is carried out within 24 hours or within a specified time, so that risks caused by failure of the danger early warning device or poor contact of a ground wire are avoided. The power supply system after the improvement has the following innovations:
1. the new system provides multiple protection, and is much safer than the prior system which only relies on one leakage switch;
2. the high current limiting device limits the electric shock current passing through the human body, and ensures the personal safety under the condition of most electric leakage;
3. the electric leakage delay tripping function enables an operator to have enough time to process electric leakage accidents, reduces the influence of power failure on life and production, and is more humanized;
4. the insulation resistance detection function of the zero line and the ground wire enables an IT system led out by the zero line to be more easily and widely popularized;
5. a current type leakage switch is used in the IT system, so that the problem that an IMD (in-mold decoration) in the IT system cannot identify a leakage position is solved.
In conclusion, the utility model aims to develop an IT system which is safer to use.
Claims (7)
1. The utility model provides a safe power supply system, includes power transformer (1), transmission line (2), load (3), the neutral point of power transformer (1) is ungrounded, load (3) pass through transmission line (2) with power transformer (1) electricity is connected, transmission line (2) include phase line (L), zero line (N), ground wire (G), phase line (L) with zero line (N) all with power transformer (1) is connected, its characterized in that: the safety power supply system further comprises a zero line ground wire insulation resistance detection module (4) and a circuit breaker (5) connected with the control module of the zero line ground wire insulation resistance detection module (4), two detection ends of the zero line ground wire insulation resistance detection module (4) are respectively connected with the zero line (N) and the ground wire (G), and the circuit breaker (5) is arranged on the power transmission line (2); when the zero line and ground wire insulation resistance detection module (4) detects that the insulation resistance between the zero line (N) and the ground wire (G) is smaller than a safety value, the circuit breaker (5) can be driven to act instantly or in a delayed mode, and connection between the corresponding power transmission line (2) and the power transformer (1) is cut off.
2. A safety power supply system as claimed in claim 1, wherein: the safety power supply system further comprises a warning device (6), wherein the warning device (6) is connected with a control module of the zero line ground wire insulation resistance detection module (4), when the zero line ground wire insulation resistance detection module (4) detects that insulation resistance between the zero line (N) and the ground wire (G) is smaller than a safety value, the zero line ground wire insulation resistance detection module (4) controls the warning device (6) to give out warning.
3. A safety power supply system as claimed in claim 2, wherein: when the zero line ground wire insulation resistance detection module (4) detects that the zero line ground wire insulation resistance is less than 30K omega, the warning device (6) gives an alarm, and when the zero line ground wire insulation resistance detection module (4) detects that the zero line ground wire insulation resistance is less than 6K omega, the warning device (6) gives an alarm and the circuit breaker (5) cuts off the circuit.
4. A safety power supply system as claimed in claim 2 or 3, wherein: the warning device (6) is a sound-light alarm device.
5. A safety power supply system as claimed in claim 1, wherein: the safety power supply system also comprises a residual current switch (7) with a time delay tripping function, wherein the residual current switch (7) with the time delay tripping function comprises a photoacoustic alarm (8) connected with the controller of the residual current switch (7) with the time delay tripping function; the load (3) is connected with the power transmission line (2) on the bus in parallel through the power transmission line (2) on the branch line, and the electric leakage switch (7) with the time delay tripping function is arranged on the power transmission line (2) on the branch line; when the leakage switch (7) with the time delay tripping function detects that the leakage exceeds the standard on the branch line where the leakage switch is located, the connection between the load (3) on the branch line and the power transmission line (2) on the bus is cut off instantly or in a time delay manner, and meanwhile, the photoacoustic alarm (8) gives an alarm.
6. A safety power supply system according to claim 5, wherein: when the leakage current detected by the leakage switch (7) with the time delay tripping function is 3 mA-12 mA, only the audible and visual alarm prompt of the photoacoustic alarm (8) is carried out, and when the alarm time of the photoacoustic alarm (8) exceeds the set time, the tripping response is carried out; when the leakage switch (7) with the time delay tripping function detects that the leakage current exceeds 12mA, tripping and power off are immediately carried out.
7. A safety power supply system as claimed in claim 1, wherein: the safety power supply system further comprises a zero line outgoing line (9) and a high impedance (z) of 20K omega-31K omega, one end of the zero line outgoing line (9) is electrically connected with a zero line (N), the other end of the zero line outgoing line (9) is electrically connected with one end of a high impedance (z), the other end of the high impedance (z) is electrically connected with a ground wire (G), the zero line outgoing line (9) is provided with a current limiting device (ELCB-1), the current limiting device (ELCB-1) detects that the current of the zero line outgoing line (9) exceeds 12mA, and the current limiting device (ELCB-1) cuts off the corresponding power transmission line (2) and the power transformer (1) to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121199864.2U CN215419567U (en) | 2021-06-01 | 2021-06-01 | Safe power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121199864.2U CN215419567U (en) | 2021-06-01 | 2021-06-01 | Safe power supply system |
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| Publication Number | Publication Date |
|---|---|
| CN215419567U true CN215419567U (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121199864.2U Active CN215419567U (en) | 2021-06-01 | 2021-06-01 | Safe power supply system |
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| CN (1) | CN215419567U (en) |
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- 2021-06-01 CN CN202121199864.2U patent/CN215419567U/en active Active
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