CN105490249A - Linkage protection device for transformer neutral point DC blocking equipment and method thereof - Google Patents
Linkage protection device for transformer neutral point DC blocking equipment and method thereof Download PDFInfo
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- CN105490249A CN105490249A CN201610030525.9A CN201610030525A CN105490249A CN 105490249 A CN105490249 A CN 105490249A CN 201610030525 A CN201610030525 A CN 201610030525A CN 105490249 A CN105490249 A CN 105490249A
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- straight equipment
- neutral point
- master controller
- equipment
- straight
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a linkage protection device for transformer neutral point DC blocking equipment and a method thereof. The linkage protection device comprises the components of an access bus which is connected with N sets of DC blocking equipment, wherein N is a positive integer which is larger than or equal with 2; a main controller which is used for monitoring state information of each set of DC blocking equipment and transmitting an instruction for triggering already acted DC blocking equipment to make a corresponding transformer neutral point be grounded when a condition that the states of the DC blocking equipment are not totally same is determined according to the state information of each set of DC blocking equipment; and a data conversion module which is connected with the access bus and the main controller and is used for converting data in the access bus to the data that are readable by the main controller and converting the instruction that is transmitted by the main controller for transmitting to the access bus. When a fault or power failure of certain DC blocking equipment occurs and the DC blocking equipment cannot operate, other sets of DC blocking equipment in normal operation can be shunted, and all transformers directly perform grounded operation, thereby sharing a DC current and preventing bearing of an overlarge DC current by a certain transformer. Furthermore the plurality of sets of equipment share one linkage protection device, thereby realizing cost saving.
Description
Technical field
The present invention relates to tranformer protection field, particularly relate to a kind of for transformer neutral point every the linked protector of straight equipment and method.
Background technology
High voltage direct current transmission (highvoltagedirectcurrenttransmission, HVDC) system because its power transmission distance, transmission capacity are large, control the feature such as flexible and obtain and apply more and more widely, but the electric network composition of AC and DC mixed running make between AC and DC system influence each other also all the more obvious.When DC transmission system one pole ground connection or bipolar unbalanced operation, direct current will inject the earth by earth electrode, in ground, direct current invades AC system by transformer neutral point earth connection, has an impact to AC system, and wherein impact is the most significantly exactly cause transformer DC magnetic bias existing.
In order to the impact suppressing direct current transportation to run transformer, transformer neutral point has been installed additional every straight equipment in increasing transformer station or power plant at present, when direct current exceedes limit value, every straight device action, transformer neutral point, by the ground connection such as electric capacity or series resistor, plays the effect of isolated DC electric current.
But, there are multiple stage neutral grounded transformer in many power plant or transformer station, if when direct current increases, there is a certain transformer neutral point cannot the situation of action every straight equipment fault or equipment dead electricity, now this transformer assume responsibility for separately all direct currents, share without other transformers, direct current may exceed design of transformer limit value, even causes the damage of transformer.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provide a kind of for transformer neutral point every the linked protector of straight equipment and method.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of for the linked protector of transformer neutral point every straight equipment, comprising:
Access bus, connect N platform every straight equipment, the described ground connection being used for controlling when neutral point direct current exceedes protection limit value corresponding transformer neutral point every straight equipment disconnect and timing the state information of self is sent to access bus, N be more than or equal to 2 positive integer;
Master controller, for monitoring each state information every straight equipment, is judging when straight equipment state is not quite identical according to each state information every straight equipment, and what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment;
Data switch module, connects described access bus and master controller, and for the data in access bus are converted to master controller identifiable design data, and the instruction transformation assigned by master controller is sent to access bus.
Of the present invention for transformer neutral point in the linked protector of straight equipment, described state information comprises neutral point direct current and the grounding switch state every straight equipment, and grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection;
The controlling corresponding transformer neutral point ground connection every straight equipment and comprise of described transmission instruction triggers action: master controller judge to receive default delay time in each when the grounding switch state of straight equipment is not quite identical, check every neutral point direct current corresponding to straight equipment: if master controller judges that neutral point direct current is less than protection limit value, the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state; If neutral point direct current is more than or equal to protection limit value, the grounding switch every straight equipment that master controller sends instruction triggers not operating enters open mode; if each is not quite identical every the grounding switch state of straight equipment after default delay time, then the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state.
Of the present invention for transformer neutral point in the linked protector of straight equipment; described linked protector also comprises the alarm module be connected with described master controller, and described alarm module is used for starting under the control at master controller when straight equipment state is not quite identical reporting to the police.
Of the present invention for transformer neutral point in the linked protector of straight equipment; described linked protector also comprises the man-machine interactively module be connected with described master controller, and described man-machine interactively module is for the inquiry of data and to the Long-distance Control every straight equipment.
Of the present invention for transformer neutral point in the linked protector of straight equipment; described linked protector also comprises the liquid crystal display be connected with described master controller, and described liquid crystal display is for receiving and showing the data of master controller and the information of man-machine interactively module input.
Of the present invention for transformer neutral point in the linked protector of straight equipment, described access bus is RS485 bus.
The invention also discloses a kind of for the interlock guard method of transformer neutral point every straight equipment, realize based on described linked protector, described method comprises:
S1, every the timing of straight equipment, the state information of self is sent to access bus, master controller to be sent to the state information in access bus every straight equipment by data switch module real-time reception;
S2, master controller are by each state information every straight equipment of described access monitoring bus, judge when straight equipment state is not quite identical according to each state information every straight equipment, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment.
Of the present invention for transformer neutral point in the interlock guard method of straight equipment, described state information comprises neutral point direct current and the grounding switch state every straight equipment; Grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection;
Described step S2 comprises:
S21, master controller judge to receive in default delay time each when the grounding switch state of straight equipment is not quite identical, enter step S22;
S22, master controller are checked every neutral point direct current corresponding to straight equipment, if neutral point direct current is less than protection limit value, performs step S23 and terminate, if neutral point direct current is more than or equal to protection limit value, performs step S24 and terminate;
The grounding switch every straight equipment that S23, master controller send instruction triggers action enters closure state;
The grounding switch every straight equipment that S24, master controller send instruction triggers not operating enters open mode, if each is not quite identical every the grounding switch state of straight equipment after default delay time, then the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state.
Of the present invention for transformer neutral point in the interlock guard method of straight equipment, in described step S2, master controller when straight equipment state is not quite identical also control alarm module start report to the police.
Of the present invention for transformer neutral point in the interlock guard method of straight equipment, described method also comprises: carry out data query by described man-machine interactively module and perform Long-distance Control to every straight equipment.
Implement of the present invention for transformer neutral point every the linked protector of straight equipment and method, there is following beneficial effect: the present invention is by access bus and master controller, realize multiple stage every the interlock of straight equipment and protection, not quite identical every straight equipment state once discovery, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment, therefore when certain every straight equipment break down or dead electricity cannot action time, can all the other regular events of tripping every straight equipment, make all directly ground connection operation of all transformers, jointly share direct current, excessive neutral point direct current is born to avoid a certain transformer, and multiple stage unit shares a linked protector, save equipment cost, further, master controller monitor in real time each transformer direct current state, and can remote control function be realized in conjunction with liquid crystal display, man-machine interactively module.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is of the present invention for the structural representation of transformer neutral point every the linked protector of straight equipment;
Fig. 2 is of the present invention for the flow chart of transformer neutral point every the linked protector of straight equipment.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
With reference to figure 1, be of the present invention for the structural representation of transformer neutral point every the linked protector of straight equipment;
Linked protector of the present invention, comprising: access bus, data switch module, master controller, preferably, also comprise alarm module, man-machine interactively module, liquid crystal display.Wherein:
Access bus, connect N platform every straight equipment, the described ground connection being used for controlling when neutral point direct current exceedes protection limit value corresponding transformer neutral point every straight equipment disconnect and timing the state information of self is sent to access bus, N be more than or equal to 2 positive integer;
Wherein, state information comprises: neutral point direct current and the grounding switch state every straight equipment, and grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection.
Preferably, RS485 bus can be adopted as the bus of transfer of data, realize this linked protector and receive each status data uploaded every straight equipment and linked protector assigns action command to each every straight equipment.RS485 agreement can realize the point-to-point information transmission of multiple equipment by the mode of a bus, Address Recognition, saves the usage quantity of data wire and lays difficulty.
Data switch module, connects described access bus and master controller, and for the data in access bus are converted to master controller identifiable design data, and the instruction transformation assigned by master controller is sent to access bus.According to RS485 bus, then data switch module can select supporting RS485 transmission/reception module.
Master controller, for monitoring each state information every straight equipment, is judging when straight equipment state is not quite identical according to each state information every straight equipment, and what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment.
Master controller is the control assembly of whole device, can be equipped with special program software practical function by common industrial computer.Also can passing through PLC, carrying out practical function by carrying out programming to PLC.
The present invention is by access bus and master controller, realize N platform every the interlock of straight equipment and protection, not quite identical every straight equipment state once discovery, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment, therefore when certain every straight equipment break down or dead electricity cannot action time, can all the other regular events of tripping every straight equipment, make all directly ground connection operation of all transformers, jointly share direct current, bear excessive neutral point direct current to avoid a certain transformer; And multiple stage unit shares a linked protector, save equipment cost.
Concrete, master controller judge to receive in default delay time each when the grounding switch state of straight equipment is not quite identical, can judge every straight equipment state not quite identical, so master controller is checked every neutral point direct current corresponding to straight equipment: if master controller judges that neutral point direct current is less than protection limit value, misoperation is there is in what represent action every straight equipment, then the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state, to make transformer neutral point ground connection, if neutral point direct current is more than or equal to protection limit value, represent not operating and occur refused action every straight equipment, the grounding switch every straight equipment that then master controller sends instruction triggers not operating enters open mode, disconnect to make the ground connection of transformer neutral point, centering point is protected, if each is not quite identical every the grounding switch state of straight equipment after default delay time, then represent still there is part every the grounding switch state of straight equipment not according to the instruction action of master controller, then the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state, to ensure all transformer neutral point ground connection, and then jointly share the impact of neutral point direct current.
Wherein, default delay time considers that data transmission and reception can exist certain time delay.Such as default delay time can be set to 5s, but not limit, specifically can arrange according to actual conditions.
Alarm module, is connected with described master controller, and described alarm module is used for starting under the control at master controller when straight equipment state is not quite identical reporting to the police.Such as warning lamp and buzzer warning, when master controller judge every straight equipment break down or power down time send sound and light alarm, remind run or patrol officer's system in there is fault.
Man-machine interactively module, is connected with described master controller, such as keyboard, mouse, and described man-machine interactively module is for the inquiry of data and to the Long-distance Control every straight equipment.
Liquid crystal display, is connected with described master controller, and described liquid crystal display is for receiving and showing the data of master controller and the information of man-machine interactively module input.
The direct current state of each transformer monitored in real time by master controller, and can remote control function be realized in conjunction with liquid crystal display, man-machine interactively module, such as: during for meeting special requirement as debugging, hotline maintenance, certain can be forced in a certain state every straight equipment by this device, as when transformer power transmission, to force in grounding switch make position every straight equipment, when avoiding power transmission, current imbalance causes transformer to trip, and stablely after power transmission cancels forced signal again.
With reference to figure 2, accordingly, the invention also discloses a kind of for the interlock guard method of transformer neutral point every straight equipment, realize based on described linked protector, described method comprises:
S1, every the timing of straight equipment, the state information of self is sent to access bus, master controller to be sent to the state information in access bus every straight equipment by data switch module real-time reception;
S2, master controller are by each state information every straight equipment of described access monitoring bus, judge when straight equipment state is not quite identical according to each state information every straight equipment, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment.
Wherein, described state information comprises neutral point direct current and the grounding switch state every straight equipment; Grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection;
Preferably, in described step S2, also control alarm module at master controller when straight equipment state is not quite identical and start warning.
Described step S2 comprises:
S21, master controller judge to receive in default delay time each when the grounding switch state of straight equipment is not quite identical, enter step S22;
S22, master controller are checked every neutral point direct current corresponding to straight equipment, if neutral point direct current is less than protection limit value, performs step S23 and terminate, if neutral point direct current is more than or equal to protection limit value, performs step S24 and terminate;
The grounding switch every straight equipment that S23, master controller send instruction triggers action enters closure state;
The grounding switch every straight equipment that S24, master controller send instruction triggers not operating enters open mode, if each is not quite identical every the grounding switch state of straight equipment after default delay time, then the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state.
Described method also comprises: carry out data query by described man-machine interactively module and perform Long-distance Control to every straight equipment.
Operation principle of the present invention is introduced in detail below with concrete example:
Equal 4 for N, every platform transformer is equipped with one separately every straight equipment, eachly state information is uploaded on linked protector by RS485 bus every straight equipment.If when straight device action, then the grounding switch state of its correspondence is open mode, if when straight equipment is not operating, then the grounding switch state of its correspondence is closure state.
If master controller is open mode monitoring certain the grounding switch state every straight equipment sometime, after the default delay time of then time delay 5s, judge whether every the grounding switch state of straight equipment be closure state, if also the grounding switch state of remaining 2 is closure state, then can judge that each is not quite identical every straight equipment state, have 2 actions, 2 not operating.But now and uncertain be the appearance misoperation of 2 actions, or the appearance refused action that 2 are not operating.So next the current value of neutral point direct current checked by master controller, carry out the judgement of fault type according to neutral point direct current.
If current value is less than the protection limit value every straight equipment, what then judge 2 actions belongs to misoperation in fact every straight equipment, master controller sends instruction to 2 every straight equipment, the grounding switch every straight equipment triggering action enters closure state, and is reported to the police by alarm module and shown the information done every straight equipment malfunction by liquid crystal display;
If current value is greater than the protection limit value every straight equipment, then judge that not operating 2 occur refused action every straight equipment, linked protector sends instruction to not operating 2 every straight equipment, trigger its grounding switch and enter open mode, and reported to the police by alarm module and show the information every straight equipment refused action by liquid crystal display; If after the default delay time of 5s, still have 1 not operating every straight equipment, namely the grounding switch state uploaded every straight equipment is still had to be closure state, then send instructions to 3 of other regular events every straight equipment, trigger its grounding switch and enter closure state, make the direct ground connection of all transformer neutral points, shared direct current.
In sum, implement of the present invention for transformer neutral point every the linked protector of straight equipment and method, there is following beneficial effect: the present invention is by access bus and master controller, realize N platform every the interlock of straight equipment and protection, not quite identical every straight equipment state once discovery, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment, therefore when certain every straight equipment break down or dead electricity cannot action time, can all the other regular events of tripping every straight equipment, make all directly ground connection operation of all transformers, jointly share direct current, excessive neutral point direct current is born to avoid a certain transformer, and multiple stage unit shares a linked protector, save equipment cost, further, master controller monitor in real time each transformer direct current state, and can remote control function be realized in conjunction with liquid crystal display, man-machine interactively module.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (11)
1., for the linked protector of transformer neutral point every straight equipment, it is characterized in that, comprising:
Access bus, connect N platform every straight equipment, the described ground connection being used for controlling when neutral point direct current exceedes protection limit value corresponding transformer neutral point every straight equipment disconnect and timing the state information of self is sent to described access bus, N be more than or equal to 2 positive integer;
Master controller, for monitoring each state information every straight equipment, is judging when straight equipment state is not quite identical according to each state information every straight equipment, and what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment;
Data switch module, connects described access bus and described master controller, for the data in described access bus are converted to described master controller identifiable design data, and the instruction transformation that described master controller is assigned is sent to described access bus.
2. according to claim 1 for the linked protector of transformer neutral point every straight equipment, it is characterized in that, described state information comprises neutral point direct current and the grounding switch state every straight equipment, and described grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection;
The controlling corresponding transformer neutral point ground connection every straight equipment and comprise of described transmission instruction triggers action: described master controller judge to receive default delay time in each when the grounding switch state of straight equipment is not quite identical, check every neutral point direct current corresponding to straight equipment: if described master controller judges that described neutral point direct current is less than protection limit value, the grounding switch every straight equipment of master controller transmission instruction triggers action enters closure state; If described neutral point direct current is more than or equal to protection limit value, the grounding switch every straight equipment that master controller sends instruction triggers not operating enters open mode; if each is not quite identical every the grounding switch state of straight equipment after default delay time, then the grounding switch every straight equipment of described master controller transmission instruction triggers action enters closure state.
3. according to claim 1 for the linked protector of transformer neutral point every straight equipment; it is characterized in that; described linked protector also comprises the alarm module be connected with described master controller, and described alarm module was used under the control of described master controller, starting warning when straight equipment state is not quite identical.
4. according to claim 1 for the linked protector of transformer neutral point every straight equipment; it is characterized in that; described linked protector also comprises the man-machine interactively module be connected with described master controller, and described man-machine interactively module is for the inquiry of data and to the Long-distance Control every straight equipment.
5. according to claim 4 for the linked protector of transformer neutral point every straight equipment; it is characterized in that; described linked protector also comprises the liquid crystal display be connected with described master controller, and described liquid crystal display is for receiving and showing the data of described master controller and the information of described man-machine interactively module input.
6. according to claim 1ly it is characterized in that for the linked protector of transformer neutral point every straight equipment, described access bus is RS485 bus.
7. for the interlock guard method of transformer neutral point every straight equipment, it is characterized in that, realize based on linked protector according to claim 1, described method comprises:
S1, every the timing of straight equipment, the state information of self is sent to access bus, master controller to be sent to the state information in access bus every straight equipment by data switch module real-time reception;
S2, master controller are by each state information every straight equipment of described access monitoring bus, judge when straight equipment state is not quite identical according to each state information every straight equipment, what send instruction triggers action controls corresponding transformer neutral point ground connection every straight equipment.
8. according to claim 7ly it is characterized in that for the interlock guard method of transformer neutral point every straight equipment, described state information comprises neutral point direct current and the grounding switch state every straight equipment; Described grounding switch state comprises the closure state of control transformer neutral ground and the open mode of control transformer neutral ground disconnection;
Described step S2 comprises:
S21, described master controller judge to receive in default delay time each when the grounding switch state of straight equipment is not quite identical, enter step S22;
S22, described master controller are checked every neutral point direct current corresponding to straight equipment, if described neutral point direct current is less than protection limit value, performs step S23 and terminate, if described neutral point direct current is more than or equal to protection limit value, performs step S24 and terminate;
The grounding switch every straight equipment that S23, described master controller send instruction triggers action enters closure state;
The grounding switch every straight equipment that S24, described master controller send instruction triggers not operating enters open mode, if each is not quite identical every the grounding switch state of straight equipment after default delay time, then the grounding switch every straight equipment of described master controller transmission instruction triggers action enters closure state.
9. according to claim 7ly to it is characterized in that for the interlock guard method of transformer neutral point every straight equipment, in described step S2, also control alarm module at described master controller when straight equipment state is not quite identical and start and report to the police.
10. according to claim 7 for the interlock guard method of transformer neutral point every straight equipment, it is characterized in that, described method also comprises: carry out data query by man-machine interactively module and perform Long-distance Control to every straight equipment.
11. is according to claim 10 for the interlock guard method of transformer neutral point every straight equipment, and it is characterized in that, described method also comprises: liquid crystal display receives and shows the data of described master controller and the information of described man-machine interactively module input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610030525.9A CN105490249B (en) | 2016-01-18 | 2016-01-18 | Linked protector and method for transformer neutral point blocking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610030525.9A CN105490249B (en) | 2016-01-18 | 2016-01-18 | Linked protector and method for transformer neutral point blocking device |
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| Publication Number | Publication Date |
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| CN105490249A true CN105490249A (en) | 2016-04-13 |
| CN105490249B CN105490249B (en) | 2018-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610030525.9A Active CN105490249B (en) | 2016-01-18 | 2016-01-18 | Linked protector and method for transformer neutral point blocking device |
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| CN (1) | CN105490249B (en) |
Cited By (3)
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| CN110994552A (en) * | 2019-12-05 | 2020-04-10 | 华中科技大学 | Autonomous switching method of neutral point ground current suppression device of transformer |
| CN112653183A (en) * | 2020-12-07 | 2021-04-13 | 苏州热工研究院有限公司 | Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid |
| US11923129B2 (en) | 2021-02-08 | 2024-03-05 | Techhold Llc | Control system for transformer protection system |
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| CN110994552A (en) * | 2019-12-05 | 2020-04-10 | 华中科技大学 | Autonomous switching method of neutral point ground current suppression device of transformer |
| CN112653183A (en) * | 2020-12-07 | 2021-04-13 | 苏州热工研究院有限公司 | Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid |
| CN112653183B (en) * | 2020-12-07 | 2023-07-28 | 苏州热工研究院有限公司 | Centralized switching control system and method for multiple transformer blocking devices of power plant or power grid |
| US11923129B2 (en) | 2021-02-08 | 2024-03-05 | Techhold Llc | Control system for transformer protection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105490249B (en) | 2018-03-23 |
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