CN201956664U - High-voltage grid protective device - Google Patents
High-voltage grid protective device Download PDFInfo
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- CN201956664U CN201956664U CN201020675312XU CN201020675312U CN201956664U CN 201956664 U CN201956664 U CN 201956664U CN 201020675312X U CN201020675312X U CN 201020675312XU CN 201020675312 U CN201020675312 U CN 201020675312U CN 201956664 U CN201956664 U CN 201956664U
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Abstract
The utility model discloses a high-voltage grid protective device, which belongs to high-voltage grid protection technology and comprises a terminal board, an input-output board and a CPU (central processing unit) board. The terminal board is used for acquiring voltages, currents and insulation resistance signals of a high-voltage grid and converting the acquired signals into weak current signals. The input-output board is used for acquiring the weak current signals converted by the terminal board, converting the acquired weak current signals into digital signals and outputting pre-disposed protection signals when the acquired weak current signals exceeds a preset value. The CPU board is used for receiving the pre-disposed protection signals transmitted by an upper computer and transmitting the signals to the input-output board. An embodiment of the high-voltage grid protective device can be used for taking corresponding protection measures according to indication of users, and high in reliability.
Description
Technical field
The utility model belongs to the high-voltage fence resist technology, particularly a kind of high-voltage fence protective device.
Background technology
The high-voltage fence protective device is mainly used in that the isolated neutral of rated voltage 10kV and following electric pressure is joined, in the power transformation system.It mainly realizes the control of three-phase alternating current isolated neutral electric power system, protection and measurement be can be used as distribution master switch, switch-dividing, or as the usefulness that directly starts high-voltage motor.
The control core that current high-voltage fence protective device commonly used generally adopts discrete component or common single-chip microcomputer to form, its system realizes complicated, poor reliability, low precision, non-programmable, communication interface disunity can't be formed monitor network.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of high-voltage fence protective device, to improve the reliability of high-voltage fence protective device.
In order to solve the problems of the technologies described above, the utility model discloses a kind of high-voltage fence protective device, comprising:
Terminal board is gathered voltage, electric current and the insulation resistance signal of high-voltage fence, and is weak electric signal with the conversion of signals that collects;
Input/output board is gathered the weak electric signal after described terminal board is changed, and the weak electric signal of being gathered is converted to digital signal, and when the weak electric signal of being gathered surpasses set point, exports pre-configured guard signal;
CPU board, the pre-configured guard signal that the reception host computer issues also sends to described input/output board.
Preferably, in the said apparatus, described CPU board comprises:
Receiver module receives the configuration parameter that host computer issues, and described configuration parameter comprises set point and pre-configured guard signal;
Last transmission module is uploaded the weak electric signal that described input/output board collects to host computer.
Preferably, described set point comprises following one or more set points:
Overvoltage set point, under-voltage set point, decompression set point, overload set point.
Preferably, in the said apparatus, described input/output board comprises:
Conditioning and acquisition module nurse one's health the weak electric signal after the described terminal board conversion for satisfying analog-to-digital signal and sampling;
Analog-to-digital conversion module is a digital signal with the electrical signal conversion of described conditioning and acquisition module sampling;
The protection processing module when weak electric signal of gathering at described conditioning and acquisition module surpasses set point, is exported pre-configured guard signal.
Preferably, described protection processing module comprises:
Detection module detects the weak electric signal that described conditioning and acquisition module gather and whether surpasses set point;
First processing module, when described detection module detected in the weak electric signal of being gathered current signal value and surpasses the overload set point, first guard signal of output configured in advance was given the switchgear that is used for cutoff high electrical network major loop.
Preferably, described protection processing module also comprises:
Second processing module, when described detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the overvoltage set point, second guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
Preferably, described protection processing module also comprises:
The 3rd processing module, when described detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the decompression set point, the 3rd guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
Preferably, described protection processing module also comprises:
The manages module everywhere, and when described detection module detected that voltage signal values surpasses under-voltage set point in the weak electric signal of being gathered, the 4th guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
Preferably, in the said apparatus, described protection processing module also comprises:
The 5th processing module, the signal in the working site take place when unusual, and the five guarantees of output configured in advance are protected signal and given and be used to improve the equipment of working site.
Preferably, in the said apparatus, described terminal board comprises:
Voltage input channel module is converted to the weak current signal with the voltage signal of the collection high-voltage fence that collected, and the weak current signal transition after will changing again is that light current is pressed signal;
Electric current input channel module changes the current signal of the high-voltage fence that collects into light current and presses signal;
Insulation resistance monitors channel module, the AC current signal of A cross streams voltage in the high-voltage fence after by insulation resistance is converted into light current presses signal.
Embodiment of the present utility model is based on the PLC programmable logic controller (PLC); combine the actual demand of Allocation transformer system; adopt instrument transformer to isolate and once survey signal; therefore; have that antijamming capability is strong, Installation and Debugging convenient, able to programme, move advantage accurately; simultaneously, embodiment of the present utility model can carry out corresponding protection operation (as short circuit and earth leakage protective operation) according to user's indication, so the reliability height.In the preferred embodiment, adopt to have the RS485 communication interface, therefore, can realize networking and Long-distance Control, simultaneously can external text display as man-machine interface.
Description of drawings
Fig. 1 is a present embodiment mesohigh electric network protection apparatus structure schematic diagram;
Fig. 2 is the conditioning of the voltage input channel on a terminal board equivalent circuit diagram in the device shown in Figure 1;
Fig. 3 is the conditioning of the current channel on a terminal board equivalent circuit diagram in the device shown in Figure 1;
Fig. 4 is that insulation resistance on the terminal board monitors passage conditioning equivalent circuit diagram in the device shown in Figure 1;
Fig. 5 is the analog input channel equivalent circuit diagram on the IO plate in the device shown in Figure 1.
Embodiment
Below in conjunction with drawings and the specific embodiments the utility model is described in further details.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
Because the reliability of existing high-voltage fence protective device is lower, therefore, the utility model applicant considers provides a kind of high-voltage fence protective device, comprising: terminal board, gather voltage, electric current and the insulation resistance signal of high-voltage fence, and be weak electric signal the conversion of signals that collects; Input/output board is gathered the weak electric signal after described terminal board is changed, and the weak electric signal of being gathered is converted to digital signal, and when the weak electric signal of being gathered surpasses set point, exports pre-configured guard signal; And CPU board, the pre-configured guard signal that the reception host computer issues also sends to described input/output board.Thereby the various scenes at high-voltage fence can be carried out the corresponding protection operation according to user's indication, thereby improve the reliability of high-voltage fence protective device.
Based on above-mentioned thought; it is a kind of based on PLC (Programmable logicController that the utility model provides; programmable logic controller (PLC)) high-voltage fence protective device; applicable to the isolated neutral that exchanges 47～53Hz, rated voltage 10kV and following electric pressure join with the power transformation system in, it also can be built in each serial flame-proof mine high voltage distribution installation under some scene.Particularly, the high-voltage fence protective device in the present embodiment as shown in Figure 1, comprises terminal board, IO (input and output) plate, CPU board and power panel.
Terminal board is gathered voltage, electric current and the insulation resistance signal of high-voltage fence, and is weak electric signal with voltage, electric current and the insulation resistance conversion of signals of the high-voltage fence gathered;
Wherein, the voltage of the high-voltage fence that terminal board is gathered, electric current and insulation resistance signal comprise: three-phase voltage signal, A and C protective current, A and C mutually measure electric current mutually, zero-sequence current, residual voltage signal and insulation resistance.
Terminal board is that the process of weak electric signal is as follows with voltage, electric current and the insulation resistance conversion of signals of gathering:
By big voltage or the weak electric signal of big electric current (promptly collecting voltage, electric current and the insulation resistance of high-voltage fence) signal transition that voltage or current transformer are imported primary side, pass to the I/O plate again for supplying digital circuit to sample.This shows that forceful electric power light current that terminal board is realized is isolated, prevent that external high pressure, big electric current from entering other parts of this device (as the IO plate etc.) and burning out this device, improved the reliability of this device.And terminal board also can improve the precision of the signal of telecommunication of being gathered.Wherein, terminal board can be the dead terminal daughter board.
In the present embodiment, terminal board comprises that voltage input channel module, electric current input channel module and insulation resistance monitor channel module;
Wherein, the equivalent electric circuit that voltage input channel module is adopted as shown in Figure 2, its primary side series resistance is pressed the signal (voltage signal of the high-voltage fence that promptly collects with the forceful electric power of input, comprise three-phase voltage signal and residual voltage signal) change the weak current signal into, the weak current signal transition after secondary side will change by parallel resistance again is a voltage signal.
The equivalent electric circuit that the current channel module is adopted as shown in Figure 3; its primary side is input as the heavy current signal (current signal of the high-voltage fence that promptly collects; comprise that protective current, A and C measure electric current and zero-sequence current to A mutually mutually with C), after instrument transformer is isolated, be that light current is pressed signal by parallel resistance with the heavy current signal transition again.
The equivalent electric circuit of insulation resistance supervision channel module as shown in Figure 4, external insulation resistance between JS and the COM end, UAIN holds the external A cross streams voltage that collects, so just insulation resistance can be converted into associated AC current signal, instrument transformer secondary side parallel resistance again is converted into light current pressure signal with this AC current signal.
IO (input and output) plate, the weak electric signal after the conversion of collection terminal daughter board is converted to digital signal with the weak electric signal that is collected, and when the weak electric signal of being gathered surpasses set point, then exports pre-configured guard signal;
Wherein, the weak electric signal after the conversion of IO plate collection terminal daughter board, the voltage input channel module, electric current input channel module and the insulation resistance that are on the collection terminal daughter board monitor the weak electric signal that channel module is exported.The IO plate is again according to each configuration parameter that CPU board issued and the weak electric signal that collects; carry out the corresponding protection operation; sampled value (the weak electric signal value that promptly collects) and set point in the received configuration parameter can be compared; if sampled value surpasses set point; then export pre-configured guard signal (being the guard signal that CPU board issues); in the present embodiment, promptly by 8 road DO and one road AO output protection signal.
Particularly, in the present embodiment, the IO plate comprises conditioning and acquisition module, analog-to-digital conversion module and protection processing module at least.Wherein:
Conditioning and acquisition module nurse one's health the weak electric signal after the terminal board conversion for satisfying analog-to-digital signal and sampling;
The conditioning of present embodiment and acquisition module can be made of some circuit shown in Figure 5, and its input is the ac voltage signal after the terminal board conditioning.For can Direct Sampling, the mode that this circuit adopts reference voltage REF that signal is raised, by selecting suitable resistance value R1 and R2 to be lifted on the no-voltage with the ac voltage signal that guarantees terminal board output, by selecting suitable R 3 and R4, make it to satisfy the requirement of AD sampling again to the signal convergent-divergent.
Analog-to-digital conversion module is a digital signal with the electrical signal conversion of nursing one's health and acquisition module is sampled;
The protection processing module when the weak electric signal of nursing one's health and acquisition module is gathered surpasses set point, is exported pre-configured guard signal;
And above-mentioned protection processing module can comprise detection module, and whether the weak electric signal that detection conditioning and acquisition module are gathered surpasses set point;
And first processing module; when detection module detects in the weak electric signal of being gathered current signal value and surpasses the overload set point; first guard signal of output configured in advance is given the switchgear that is used for cutoff high electrical network major loop; like this; this switchgear can reach the effect of protection high-voltage fence according to guard signal cutoff high electrical network major loop.
On the basis of the above, the protection processing module can also comprise:
Second processing module, when detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the overvoltage set point, second guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence;
The 3rd processing module, when detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the decompression set point, the 3rd guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence;
And the manage module everywhere, and when detection module detected that voltage signal values surpasses under-voltage set point in the weak electric signal of being gathered, the 4th guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
In the present embodiment, analog-to-digital conversion module on the IO plate and protection processing module are integrated among the DSP (digital signal processor, Digital Signal Processing).Specifically adopted TI Company DSP chip TMS320LF2407A; its AD sampled signal to conditioning and acquisition module input is carried out the AD conversion; and with signal value after the AD conversion and the set point comparison that receives from CPU element the configuration parameter; signal value after the AD conversion surpasses set point; then execute protection operation; after promptly determining scene, by 8 road DO and pre-configured first guard signal, second guard signal, the 3rd guard signal or the 4th guard signal of one road AO output according to comparative result.Pass through the SPI communication between this dsp chip and the CPU board.Certainly in other scenes, analog-to-digital conversion module can adopt different devices or chip to realize respectively with the protection processing module, perhaps analog-to-digital conversion module and protection processing module is integrated in other control chips, for example MCU etc.
In other preferred versions; the protection processing module is managed module everywhere to carry out the various protections operations except comprising above-mentioned detection module, first processing module, second processing module, the 3rd processing module and the; can also comprise the 5th processing module; signal in the working site takes place when unusual, and the five guarantees of output configured in advance are protected signal and given and be used to improve the equipment of working site.Wherein, the signal of working site comprises operational environment signal (as temperature, air pressure and the humidity etc. of operational environment) and the output signal of other equipment that can exert an influence to high-voltage web system (as voltage output, hold residual quantity output etc.).For example, when the temperature anomaly of working site, export five guarantees and protect signal and give external equipment, this external equipment can be lowered the temperature according to guard signal and be waited protection to operate.Be the DSP that present embodiment adopts, can gather the operational environment of this device by input of 10 road DI digital quantities and 2 road AI analog quantity input signals.
CPU board, receive the configuration parameter (as each set point and pre-configured guard signal) that host computer issues and send to as described in input/output board, and the digital signal after the conversion of IO plate is uploaded to host computer to show.
CPU can comprise receiver module and last transmission module, wherein:
Receiver module; receive the configuration parameter that host computer issues; configuration parameter comprises set point and pre-configured guard signal (first guard signal of for example above being mentioned, second guard signal, the 3rd guard signal, the 4th guard signal and five guarantees are protected signal etc.), and the set point in the configuration parameter comprise following one or more:
Overvoltage set point, under-voltage set point, decompression set point, overload set point.
Last transmission module is uploaded the weak electric signal that the IO plate collects to host computer.
In the present embodiment, CPU board adopts Infineon (former Siemens semiconductor) 16Bits single-chip microcomputer SAF-C164CI-LM; It provides RS232 communication link, and the following dress passage of system monitor and user application can be provided; Support the visit of CPU board to outside serial device, and the standard of support ModBus agreement; In concrete the application if can also add the CPU module of the LM of Hollysys series of PLC series when needing to gather more voltage and current signal by the expansion mouth on the CPU board; Gather the more voltage of multiple spot number when needs, can also extend out other expansion module of Hollysys when electric current and switching value signal and count to increase the voltage and current signal collection; Realize telecommunication if can add the LM of Hollysys series of PLC respective communication module when needing fieldbus or ethernet communication.
Power panel mainly with the 24V direct current of input, carries out protective treatment and is converted to+the 5V direct current, delivers to the IO plate and uses.
The electrical network high pressure protector that the foregoing description proposed has overvoltage, under-voltage, decompression, overload, short circuit, electric leakage, insulation/loop monitor protection etc., can simulate electric leakage and insulation fault and test.And energy measurement and calculating three-phase voltage, A and C phase current, residual voltage and electric current, meritorious and reactive power, power factor equivalence, signals collecting adopts instrument transformer and once surveys isolation, also carry simultaneously 10 road DI (source leak digital input, digital input signals), 2 road voltage-type AI, 1 road voltage-type AO and 8 road normally opened relay type DO, and spare interface can external display system.
The above is a preferred embodiments of the present invention only, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a high-voltage fence protective device is characterized in that, this device comprises:
Terminal board is gathered voltage, electric current and the insulation resistance signal of high-voltage fence, and is weak electric signal with the conversion of signals that collects;
Input/output board is gathered the weak electric signal after described terminal board is changed, and the weak electric signal of being gathered is converted to digital signal, and when the weak electric signal of being gathered surpasses set point, exports pre-configured guard signal;
CPU board, the pre-configured guard signal that the reception host computer issues also sends to described input/output board.
2. device as claimed in claim 1 is characterized in that, described CPU board comprises:
Receiver module receives the configuration parameter that host computer issues, and described configuration parameter comprises set point and pre-configured guard signal;
Last transmission module is uploaded the weak electric signal that described input/output board collects to host computer.
3. device as claimed in claim 1 or 2 is characterized in that, described input/output board comprises:
Conditioning and acquisition module nurse one's health the weak electric signal after the described terminal board conversion for satisfying analog-to-digital signal and sampling;
Analog-to-digital conversion module is a digital signal with the electrical signal conversion of described conditioning and acquisition module sampling;
The protection processing module when weak electric signal of gathering at described conditioning and acquisition module surpasses set point, is exported pre-configured guard signal.
4. device as claimed in claim 3 is characterized in that, described protection processing module comprises:
Detection module detects the weak electric signal that described conditioning and acquisition module gather and whether surpasses set point;
First processing module, when described detection module detected in the weak electric signal of being gathered current signal value and surpasses the overload set point, first guard signal of output configured in advance was given the switchgear that is used for cutoff high electrical network major loop.
5. device as claimed in claim 4 is characterized in that, described protection processing module also comprises:
Second processing module, when described detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the overvoltage set point, second guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
6. device as claimed in claim 5 is characterized in that, described protection processing module also comprises:
The 3rd processing module, when described detection module detected in the weak electric signal of being gathered voltage signal values and surpasses the decompression set point, the 3rd guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
7. device as claimed in claim 6 is characterized in that, described protection processing module also comprises:
The manages module everywhere, and when described detection module detected that voltage signal values surpasses under-voltage set point in the weak electric signal of being gathered, the 4th guard signal of output configured in advance was given the equipment that is used for controlling this phase voltage of high-voltage fence.
8. as each described device of claim 4 to 7, it is characterized in that described protection processing module also comprises:
The 5th processing module, the signal in the working site take place when unusual, and the five guarantees of output configured in advance are protected signal and given and be used to improve the equipment of working site.
9. device as claimed in claim 8 is characterized in that, described terminal board comprises:
Voltage input channel module is converted to the weak current signal with the voltage signal of the collection high-voltage fence that collected, and the weak current signal transition after will changing again is that light current is pressed signal;
Electric current input channel module changes the current signal of the high-voltage fence that collects into light current and presses signal;
Insulation resistance monitors channel module, the AC current signal of A cross streams voltage in the high-voltage fence after by insulation resistance is converted into light current presses signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020675312XU CN201956664U (en) | 2010-12-13 | 2010-12-13 | High-voltage grid protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020675312XU CN201956664U (en) | 2010-12-13 | 2010-12-13 | High-voltage grid protective device |
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| Publication Number | Publication Date |
|---|---|
| CN201956664U true CN201956664U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020675312XU Expired - Lifetime CN201956664U (en) | 2010-12-13 | 2010-12-13 | High-voltage grid protective device |
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| CN (1) | CN201956664U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793554A (en) * | 2015-04-10 | 2015-07-22 | 国家电网公司 | Large-current monitoring system |
-
2010
- 2010-12-13 CN CN201020675312XU patent/CN201956664U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793554A (en) * | 2015-04-10 | 2015-07-22 | 国家电网公司 | Large-current monitoring system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100176, No. 3, building 21, prosperous street, Beijing economic and Technological Development Zone, Beijing, four or five Patentee after: Beijing Helishi Intelligent Technology Co Ltd Address before: 100176, No. 3, building 21, prosperous street, Beijing economic and Technological Development Zone, Beijing, four or five Patentee before: Beijing HollySys Automation Co., Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 100176, No. 1, building 2, No. 5 middle Sheng Road, Beijing economic and Technological Development Zone, 1510-1515 Patentee after: Beijing Helishi Intelligent Technology Co Ltd Address before: 100176, No. 3, building 21, prosperous street, Beijing economic and Technological Development Zone, Beijing, four or five Patentee before: Beijing Helishi Intelligent Technology Co Ltd |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |