CN211086548U - Distributed grounding line selection device based on main machine and sub machine - Google Patents
Distributed grounding line selection device based on main machine and sub machine Download PDFInfo
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- CN211086548U CN211086548U CN201921424379.3U CN201921424379U CN211086548U CN 211086548 U CN211086548 U CN 211086548U CN 201921424379 U CN201921424379 U CN 201921424379U CN 211086548 U CN211086548 U CN 211086548U
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Abstract
The utility model discloses a distributed ground connection route selection device based on main parasite aircraft, including a host computer and a plurality of parasite aircraft, realize wireless communication through the L oRa module of main, parasite aircraft between main, the parasite aircraft, zero sequence voltage transformer is used for measuring generating line zero sequence voltage, and current transformer is used for gathering circuit three phase current, the utility model discloses can cooperate current line protection device to realize the warning or the tripping operation function of ground connection circuit in the distribution network, the utility model has the advantages of installation and wiring are simple, do not influence current transformer substation's protect function configuration, are applicable to the quick and low-cost transformation of the transformer substation that has already put into use and has not configured ground connection route selection device, have wide application market.
Description
Technical Field
The utility model relates to a distributing type ground connection route selection device based on owner's submachine belongs to distribution network relay protection technical field.
Background
The 10-66 kV power supply system in China generally adopts an operation mode that a neutral point is not directly grounded (low-current grounding), when a single-phase ground fault occurs, because a short circuit loop with low impedance is not formed, the steady-state current of the ground fault is small, the secondary side current is generally less than 1 ampere, and the arc can be automatically extinguished under most conditions. However, in order to prevent interphase short circuit caused by insulation breakdown and prevent the expansion of accidents, when a single-phase ground fault occurs in the system, it is required to accurately select the fault line and quickly cut the fault line.
At present, the centralized grounding line selection device is mainly applied to an electric power system, voltage and current signals of a plurality of lines can be collected at the same time, the line with a single-phase grounding short-circuit fault is identified according to a line selection method of transient signals or steady-state signals, and the line selection accuracy can reach over 90%. However, the line selection device is not matched with the line protection measurement and control device, and the line selection device does not have a time delay tripping function, so that it is difficult to cut off a fault line in time after correct line selection.
Aiming at a transformer substation which is built in operation in the early stage but is not provided with a grounding line selection device, if a centralized grounding line selection device is added, the transformation cost is high and the problem of coordination with protection exists; if the existing line protection device is modified and upgraded to integrate the distributed grounding line selection function, on one hand, the problem of high modification cost also exists, on the other hand, the configuration of the existing protection function can be influenced, the modification and upgrading difficulty is high, and meanwhile, the distributed grounding line selection function enables the lines to be completely independent in judgment, so that the advantages of comprehensive judgment and high line selection accuracy of a centralized line selection device are lost.
SUMMERY OF THE UTILITY MODEL
For solving prior art's not enough, the utility model discloses a distributed ground connection route selection device based on main parasite aircraft has solved no undercurrent ground connection route selection configuration function and has reformed transform with high costs, reform transform the big scheduling problem of the degree of difficulty to having come into operation, not being equipped with ground connection route selection device and not involving in the short time on a large scale transformation substation.
In order to achieve the aim, the utility model adopts the following technical scheme that the distributed grounding line selection device based on the main sub machine comprises a main machine and a plurality of sub machines and is characterized in that the main machine comprises a zero sequence voltage transformer, a main machine A/D module, a main machine CPU and a main machine L oRa module which are sequentially connected, each sub machine comprises a current transformer, a sub machine A/D module, a sub machine CPU, a sub machine L oRa module, a signal indicator lamp and a signal output relay, the output of the current transformer is connected with the sub machine A/D module, the sub machine L oRa module, the signal indicator lamp and the signal output relay are respectively connected with the sub machine CPU, wireless communication is achieved between the main machine and the sub machine through the sub machine L oRa modules, the zero sequence voltage transformer is used for measuring bus zero sequence voltage, and the current transformer is used for collecting three-phase current.
The distributed grounding line selection device based on the main machine and the sub machine is characterized in that the main machine further comprises a communication interface connected with a CPU of the main machine, and the communication interface is an Ethernet communication interface and is used for uploading fault information to a remote system.
The distributed grounding line selection device based on the master machine and the slave machine is characterized in that three current transformers are used for respectively collecting three-phase current of a line.
The distributed grounding line selection device based on the master machine and the slave machine is characterized in that two signal output relays are provided and are respectively used for outputting a fault alarm and a fault tripping signal.
The distributed grounding line selection device based on the main machine and the sub machine is characterized in that the number of the signal indicator lamps is three, and the signal indicator lamps are respectively used for indicating normal operation, fault alarm and fault tripping signals.
The distributed grounding line selection device based on the main machine and the sub machine is characterized in that the main machine is installed at a PT interval nearby and used for collecting bus zero sequence voltage.
The distributed grounding line selection device based on the main sub-machine is characterized in that the sub-machine is arranged at intervals of each line and collects three-phase currents of the lines.
The utility model discloses an essential electric current of single interval ground connection route selection device and voltage transformer, AD sampling module, CPU module, signal indicator, signal output relay etc. combine together with current L oRa wireless communication module, have realized that ground connection route selection device is simplified, the modularization, low cost, do not influence the current protect function configuration of transformer substation and through the cooperation improvement beneficial effect such as whole route selection rate of accuracy of wireless communication between the host computer, have wide application market.
Drawings
Fig. 1 is a schematic diagram of a hardware component of a host according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the hardware components of the handset according to an embodiment of the present invention;
fig. 3 is a schematic view of a non-invasive access or installation manner of a handset according to an embodiment of the present invention;
fig. 4 is a topology diagram of wireless communication between the master and slave devices according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in figures 1 and 2, the distributed grounding line selection device based on the main machine and the sub machine comprises a main machine and a plurality of sub machines, wherein the main machine comprises a zero sequence voltage transformer, a main machine A/D module, a main machine CPU and a main machine L oRa module which are sequentially connected, each sub machine comprises a current transformer, a sub machine A/D module, a sub machine CPU, a sub machine L oRa module, a signal indicator lamp and a signal output relay, the output of the current transformer is connected with the sub machine A/D module, and the sub machine A/D module, the sub machine L oRa module, the signal indicator lamp and the signal output relay are respectively connected with the sub machine CPU;
the main machine is arranged at the PT interval, and the zero sequence voltage transformer is used for measuring the zero sequence voltage of the bus;
the submachine is installed at a line protection device nearby, and the current transformer is used for collecting three-phase current of a line.
The host computer also comprises a communication interface connected with the CPU of the host computer, wherein the communication interface is an Ethernet communication interface and is used for uploading the fault information to a remote system. The host also includes a debug interface connected to the host CPU.
The number of the current transformers is three, and the three current transformers respectively collect three-phase current of the line.
And the two signal output relays are respectively used for outputting a fault alarm and a fault tripping signal.
The signal indicator lamps are three and are respectively used for indicating normal operation, fault warning and fault tripping signals.
The host is installed in the PT interval nearby. The sub-machines are installed at intervals of each line nearby, three-phase currents of the lines are collected, the number of the sub-machines is consistent with the number of the intervals of the lines in the power distribution network system, and one sub-machine is arranged at each line interval.
The host computer A/D module is used for converting the acquired bus zero sequence voltage into a digital signal;
the sub-machine A/D module is used for converting the acquired three-phase current of the line into a digital signal;
as shown in fig. 3, the sub-unit is connected to the three-phase current of the line in a non-invasive connection manner, and the cable of the three-phase current is directly clamped without changing the existing connection wire, so that the current signal is acquired.
The sub-machine CPU judges whether a ground fault occurs according to the obtained line three-phase current data, and transmits a primary judgment result to the main machine CPU through an L oRa module for confirmation, the main machine CPU further confirms the ground fault by combining the received sub-machine judgment result with the collected bus voltage data characteristics, and feeds back the confirmed result to the sub-machine CPU through a L oRa module, the sub-machine CPU outputs the judgment result (outputs a fault alarm and a fault trip signal) through a signal output relay according to the confirmation result fed back by the main machine, and simultaneously realizes corresponding indication through a signal indicator lamp (the fault alarm output lights an alarm indicator lamp, and the fault trip lights a trip indicator lamp).
The device has the following use process:
the utility model discloses be applied to in 10~66kV voltage class's distribution network system, wherein the host computer of this device is installed in the PT interval of system nearby, a plurality of submachine of this device are installed respectively in each circuit interval of system, for example, can install in the protection device department of each circuit nearby, the schematic diagram refers to figure 4. when single-phase ground fault takes place for a certain line in the system, can produce transient state zero sequence current and zero sequence voltage of certain size in every circuit of this system, zero sequence CT in this device submachine becomes the signal that submachine AD sampling module can directly gather, submachine AD sampling module transmits the sampling data for submachine CPU module and carries out the operation and judgement processing, CPU confirms whether single-phase ground fault has taken place for this circuit according to transient state zero sequence current's data characteristic, in addition, a plurality of submachine of this device all can realize wireless communication between L oRa module and the host computer through the zero sequence CT, the submachine transmits this spaced ground information for the host computer, zero sequence PT in the host computer transmits the collected busbar voltage information for the host computer CPU module after the host computer AD sampling, CPU confirms the grounding information that the submachine transmits according to the busbar voltage information that the corresponding bus-line is confirmed, can improve through the effective rate of communication after the submachine.
After confirmation and feedback between the master and slave machines, if the line is judged to have single-phase grounding fault, the slave machines send single-phase grounding alarm indication through the signal indicating lamp.
If the device is matched with a line protection measurement and control device for use, a corresponding signal output relay can be connected with the input of the line protection measurement and control device, and line grounding information is transmitted to the line protection measurement and control device; after the short-time ground fault or the ground fault is effectively processed, the warning indicator lamp can be remotely reset in a remote control mode.
The utility model can independently realize fault detection and alarm indication, and can also cooperate with a line protection measurement and control device to realize the processing of fault lines; when the line protection and monitoring device is matched with the line protection and monitoring device, the functions including but not limited to tripping on a fault line can be realized, and the function of resetting a fault alarm can also be realized by connecting a remote control outlet of the line protection and monitoring device to a signal input of a submachine.
The utility model has the advantages of installation and wiring are simple, do not influence current transformer substation protect function configuration, are applicable to the quick and low-cost transformation of transformer substation that has come into use and not dispose ground connection route selection device, have wide application market.
To sum up, the utility model has the advantages of the wiring is simple, use cost is low, do not influence current transformer substation protect function configuration, synthesize other circuit data information and improve the route selection rate of accuracy, be applicable to the low-cost transformation of the transformer substation that has come into use and not dispose ground connection route selection device, have wide application market.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.
Claims (7)
1. A distributed grounding line selection device based on a master machine and a slave machine comprises a master machine and a plurality of slave machines and is characterized in that the master machine comprises a zero sequence voltage transformer, a master machine A/D module, a master machine CPU and a master machine L oRa module which are sequentially connected, the slave machine comprises a current transformer, a slave machine A/D module, a slave machine CPU, a slave machine L oRa module, a signal indicator lamp and a signal output relay, the output of the current transformer is connected with the slave machine A/D module, the slave machine L oRa module, the signal indicator lamp and the signal output relay are respectively connected with the slave machine CPU, the master machine and the slave machine realize wireless communication through the master machine L oRa module and the slave machine module, the zero sequence voltage transformer is used for measuring bus zero sequence voltage, and the current transformer is used for collecting three.
2. The distributed grounding line selection device based on the main machine and the sub machine as claimed in claim 1, wherein the main machine further comprises a communication interface connected with a CPU of the main machine, and the communication interface is an ethernet communication interface for uploading fault information to a remote system.
3. The distributed grounding line selection device based on the master and slave machines as claimed in claim 1, wherein the number of the current transformers is three, and the current transformers collect three phase currents of a line respectively.
4. The distributed grounding line selection device based on the master and slave machines as claimed in claim 1, wherein there are two signal output relays for outputting fault alarm and fault trip signal respectively.
5. The distributed grounding line selection device based on the master and slave machines as claimed in claim 1, wherein the number of the signal indicator lamps is three, and the signal indicator lamps are respectively used for indicating normal operation, fault alarm and fault tripping signals.
6. The distributed grounding line selection device based on the master machine and the slave machine as claimed in claim 1, wherein the master machine is installed nearby in a PT interval and collects zero sequence voltage of a bus.
7. The distributed grounding line selection device based on the main line and the sub lines as claimed in claim 1, wherein the sub lines are installed nearby at intervals of each line and collect three-phase currents of the lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424379.3U CN211086548U (en) | 2019-08-29 | 2019-08-29 | Distributed grounding line selection device based on main machine and sub machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921424379.3U CN211086548U (en) | 2019-08-29 | 2019-08-29 | Distributed grounding line selection device based on main machine and sub machine |
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| Publication Number | Publication Date |
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| CN211086548U true CN211086548U (en) | 2020-07-24 |
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| CN201921424379.3U Active CN211086548U (en) | 2019-08-29 | 2019-08-29 | Distributed grounding line selection device based on main machine and sub machine |
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