CN211296176U - Single-phase earth fault detection line selection protection device of transfer station low current grounding system - Google Patents
Single-phase earth fault detection line selection protection device of transfer station low current grounding system Download PDFInfo
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- CN211296176U CN211296176U CN202020269253.XU CN202020269253U CN211296176U CN 211296176 U CN211296176 U CN 211296176U CN 202020269253 U CN202020269253 U CN 202020269253U CN 211296176 U CN211296176 U CN 211296176U
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Abstract
The utility model discloses a change and supply single-phase earth fault of station undercurrent ground system to detect line selection protection device, including setting up signal detection collection module on the power supply branch road, the surveillance center who is connected with the generating line, signal detection collection module and surveillance center data connection, the surveillance center is including monitoring line selection module, line protection module, control server, data connection between control server and monitoring line selection module, line protection module, the signal detection collection module accomplishes operation data management, logic judgement and line selection protect function. The utility model discloses can in time monitor short-term nature and permanent single-phase earth fault to judge and fall to the ground fault loop and implement interim protection, do benefit to and get into in advance before the power system tripping operation has a power failure and overhaul, reduce equipment and cause great damage risk, avoid the risk that equipment facility accident shut down and cause.
Description
Technical Field
The utility model belongs to the technical field of power equipment, concretely relates to transfer and supply station undercurrent grounding system single-phase earth fault detection route selection protection device.
Background
The power supply station system of Yuxi Dahongshan mining company Limited is a neutral point ungrounded system, the adopted system power comprehensive protection device can only monitor the unbalance of three-phase voltage, can not directly judge a single-phase grounding fault loop, and a fault loop to be cut and eliminated can only judge the fault loop by a circuit pulling method, namely, the power supply loop of the system is cut one by one to judge the fault loop, so that time and labor are wasted, and the production operation is partially or even completely interrupted; if the fault loop cannot be determined in time and the fault is eliminated, the production and electricity safety is threatened greatly. The short-circuit fault of the equipment of the small-current grounding power system is generally a short-time single-phase grounding fault after insulation aging, gradually develops into a single-phase permanent grounding fault, and finally develops into inter-phase short-circuit fault tripping power failure. The existing single-phase earth fault detection generally detects a single-phase permanent ground fault, but cannot detect and judge a short-time single-phase earth fault, so that the fault is changed from small to large.
Therefore, the key point for solving the problems is to research and develop a single-phase earth fault detection line selection protection device of the transfer station low-current earth system, which can detect a single-phase permanent ground fault, detect a short-time single-phase earth fault and perform line protection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can detect single-phase permanent fault that falls to the ground, can detect single-phase earth fault in short-term again to take measures in advance, troubleshooting reduces the commentaries on classics that maintenance cost and loss supply station undercurrent earthing system single-phase earth fault and detects the route selection protection device valve.
The utility model aims at realizing like this, including setting up the signal detection collection module on the power supply branch road, with the surveillance center of bus connection, signal detection collection module and surveillance center data connection, the surveillance center is including monitoring route selection module, line protection module, control server, data connection between control server and monitoring route selection module, line protection module, the signal detection collection module accomplishes operation data management, logic judgement and route selection protect function, special signal injection, ground fault discrimination function are accomplished to monitoring route selection module, line protection module accomplishes line protection function according to control server's logic judgement, signal detection collection module accomplishes special signal acquisition and transmits to control server's function.
The utility model discloses following technological effect has:
the short-circuit fault of the equipment of the small-current grounding power system is generally a short-time single-phase grounding fault after insulation aging, gradually develops into a single-phase permanent grounding fault, and finally develops into inter-phase short-circuit fault tripping power failure. After reforming transform original system, short-term and permanent single-phase earth fault (promptly before tripping operation has a power failure, less to the production influence) can in time be monitored to this device, and judge the fault return circuit that falls to the ground, reduce single-phase earth fault to electric power system's harm through arc suppression coil and vacuum contactor mutually supporting action simultaneously, carry out interim protection to the system, be favorable to getting into in advance before electric power system tripping operation has a power failure and overhaul, reduce equipment and cause great damage risk, reduce safe power consumption risk, in time adjust production through backstage alarm information, the power supply operation, avoid production to be forced to shut down, avoid the risk that equipment facilities accident shut down and cause.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a control schematic block diagram of the present invention;
in the figure: the system comprises a power supply bus 1, a power supply branch 2, a signal detection and acquisition module 3, a three-phase voltage monitoring module 4, a line protection module 5, a line monitoring and selection module 6, a vacuum contactor 7, an arc suppression coil 8, a high-voltage silicon controlled rectifier 9, a voltage transformer 10, an isolation switch 11, a grounding transformer 12 and a fuse 13.
Detailed Description
The following description of the present invention is provided with reference to the accompanying drawings, which are not intended to limit the present invention in any way, and any alterations or replacements made based on the teachings of the present invention are all within the protection scope of the present invention.
As shown in the accompanying drawings 1-2 the utility model discloses a set up signal detection collection module 3 on the power supply branch road, with the monitor center of generating line connection, signal detection collection module 3 and monitor center data connection, the monitor center is including monitoring route selection module 6, line protection module 5, control server carries out data interchange with monitoring route selection module 6, line protection module 5, between the signal detection collection module 3, accomplishes operation data management, logic judgement and route selection protect function, special signal injection, ground fault discrimination function are accomplished to monitoring route selection module 6, line protection function is accomplished according to control server's logic judgement to line protection module 5, signal detection collection module 3 accomplishes special signal acquisition and transmits to control server's function.
The monitoring line selection module 6 comprises a signal injection device, and the signal injection device is used for injecting special signals into the line.
The line protection module 5 comprises a vacuum contactor 7 and an arc suppression coil 8, the vacuum contactor 7 is used for bypassing transient and high-frequency grounding capacitance current, and the arc suppression coil 8 is used for transient inductance current.
The signal detection and acquisition module 3 comprises a zero sequence current transformer and a line selection signal collector, wherein the zero sequence current transformer is used for detecting pulse controllable zero sequence current signals in the branch circuits, and the line selection signal collector is used for converting the pulse controllable zero sequence current signals detected by the zero sequence current transformer into digital signals and sending the digital signals to the control server.
The monitoring center comprises an alarm device, the alarm device is electrically connected with the control server, and the alarm device is used for giving an alarm.
The monitoring center comprises an information input and output device.
The information input and output device includes a monitor screen.
The special signal is a zero sequence current signal.
The utility model discloses theory of operation and working process: when the three-phase voltage monitoring module 4 detects unbalanced three-phase voltage, namely when a single-phase earth fault occurs in a system with a neutral point not directly earthed, the control server rapidly controls the on and off of the high-voltage silicon controlled rectifier of the monitoring line selection module 6 to form a pulse controllable zero-sequence current signal (the system becomes a system with a neutral point earthed with a large resistance within a short time (10 ms), the system earth short-circuit current is large enough to be effectively detected by a zero-sequence current transformer, but can not cause the tripping of a loop), the pulse controllable zero-sequence current signal flows through each branch, a zero-sequence current transformer (zero-sequence CT) of the signal detection and acquisition module 3 on each branch acquires a signal, the signal is converted into a digital signal by a line selection signal acquisition device and then transmitted to the control server, and the fault loop is judged by the control server line selection, and displays and issues an alarm on a monitor screen connected to the control server. Then, according to the property of the single-phase earth fault judged by the control server, corresponding different protection modes are adopted, and arc suppression coils and contact arc suppression are matched with each other to realize mutual protection. If the fault is transient ground fault and arc grounding fault, after the line selection judgment is completed, the vacuum contactor 7 and the pulse type arc suppression coil 8 are started to work quickly, the vacuum contactor is used for bypassing transient and high-frequency grounding capacitance current, the pulse type arc suppression coil is used for transient inductance current, when the pulse type arc suppression coil compensates the grounding capacitance current, the vacuum contactor is cut off, and the pulse type arc suppression coil is withdrawn after the fault is eliminated. If the fault is a permanent single-phase earth fault, the vacuum contactor is started to work quickly after the line selection judgment is finished, the vacuum contactor is used for directly bypassing the earth capacitance current, the safety of a fault branch, particularly a cable branch, is protected, and the normal state is recovered after a technician overhauls and eliminates the branch fault, so that the safe operation of the system is facilitated.
Claims (7)
1. The utility model provides a single-phase earth fault detection route selection protection device of little current grounding system of switching power supply station, including setting up signal detection collection module (3) on the power supply branch road, the surveillance center who is connected with the generating line, characterized by: the monitoring system is characterized in that the signal detection and acquisition module (3) is in data connection with the monitoring center, the monitoring center comprises a monitoring line selection module (6), a line protection module (5) and a control server, data exchange is carried out between the control server and the monitoring line selection module (6), the line protection module (5) and the signal detection and acquisition module (3), the functions of operation data management, logic judgment and line selection protection are completed, the monitoring line selection module (6) completes the functions of special signal injection and ground fault judgment, the line protection module (5) completes the function of line protection according to the logic judgment of the control server, and the signal detection and acquisition module (3) completes the functions of special signal acquisition and transmission to the control server.
2. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the monitoring line selection module (6) comprises a signal injection device, and the signal injection device is used for injecting special signals into a line.
3. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the circuit protection module (5) comprises a vacuum contactor (7) and an arc suppression coil (8), wherein the vacuum contactor (7) is used for grounding capacitance current, and the arc suppression coil (8) is used for transient inductance current.
4. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the signal detection and acquisition module (3) comprises a zero sequence current transformer and a line selection signal collector, wherein the zero sequence current transformer is used for detecting pulse controllable zero sequence current signals in the branch circuits, and the line selection signal collector is used for converting the pulse controllable zero sequence current signals detected by the zero sequence current transformer into digital signals and sending the digital signals to the control server.
5. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the monitoring center comprises an alarm device, the alarm device is electrically connected with the control server, and the alarm device is used for giving an alarm.
6. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the special signal is a zero sequence current signal.
7. The power transfer station low-current grounding system single-phase grounding fault detection line selection protection device as claimed in claim 1, wherein: the monitoring center comprises an information input and output device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020269253.XU CN211296176U (en) | 2020-03-07 | 2020-03-07 | Single-phase earth fault detection line selection protection device of transfer station low current grounding system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020269253.XU CN211296176U (en) | 2020-03-07 | 2020-03-07 | Single-phase earth fault detection line selection protection device of transfer station low current grounding system |
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| CN211296176U true CN211296176U (en) | 2020-08-18 |
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| CN202020269253.XU Active CN211296176U (en) | 2020-03-07 | 2020-03-07 | Single-phase earth fault detection line selection protection device of transfer station low current grounding system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725823A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase non-effective grounding power supply system |
-
2020
- 2020-03-07 CN CN202020269253.XU patent/CN211296176U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725823A (en) * | 2020-12-12 | 2021-11-30 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase non-effective grounding power supply system |
| CN113725823B (en) * | 2020-12-12 | 2023-04-25 | 保定钰鑫电气科技有限公司 | Method for processing interphase short circuit of three-phase non-effective grounding power supply system |
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