CN113872167B - Device and method for preventing malfunction or refusal of protection caused by ground fault in DC system - Google Patents
Device and method for preventing malfunction or refusal of protection caused by ground fault in DC system Download PDFInfo
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- CN113872167B CN113872167B CN202111402914.7A CN202111402914A CN113872167B CN 113872167 B CN113872167 B CN 113872167B CN 202111402914 A CN202111402914 A CN 202111402914A CN 113872167 B CN113872167 B CN 113872167B
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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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for DC systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Emergency Protection Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
本发明公开了一种防止直流系统接地故障引起保护误动或拒动的装置及方法，该装置包括电源、第一控制装置组、合闸线圈、第二控制装置组、跳闸线圈、第一触点开闭逻辑判断单元和第二触点开闭逻辑判断单元；第一触点开闭逻辑判断单元用于第一控制装置组的触点断开或闭合状态的检测和判断；第二触点开闭逻辑判断单元用于第二控制装置组的触点断开或闭合状态的检测和判断。本发明通过在合闸线圈和跳闸线圈靠近直流系统正极一侧新增触点开闭逻辑判断单元，以控制合闸线圈和跳闸线圈在直流系统接地故障下仍能正确不动作或动作，即不会发生保护误动或拒动，从而有效防止由直流系统接地故障引起的保护误动或拒动。
The present invention discloses a device and method for preventing a DC system grounding fault from causing protection malfunction or refusal to operate. The device includes a power supply, a first control device group, a closing coil, a second control device group, a tripping coil, a first contact opening and closing logic judgment unit, and a second contact opening and closing logic judgment unit; the first contact opening and closing logic judgment unit is used for detecting and judging the open or closed state of the contacts of the first control device group; the second contact opening and closing logic judgment unit is used for detecting and judging the open or closed state of the contacts of the second control device group. The present invention adds a contact opening and closing logic judgment unit to the closing coil and the tripping coil close to the positive pole of the DC system to control the closing coil and the tripping coil to still correctly not operate or operate under the DC system grounding fault, that is, no protection malfunction or refusal to operate will occur, thereby effectively preventing protection malfunction or refusal to operate caused by the DC system grounding fault.
Description
Technical Field
The invention relates to the technical field of protection malfunction or refusal caused by a direct current system grounding fault, in particular to a device and a method for preventing protection malfunction or refusal caused by the direct current system grounding fault.
Background
Direct current systems are susceptible to positive or negative grounding, subject to climatic, artificial, natural and environmental factors. When single-point grounding occurs, the system can still work normally, but when two or more positive or negative electrodes are grounded, protection misoperation or refusal operation can be easily caused. Protection malfunction can lead to unexpected power failure and reduce the power supply reliability. And if the protection refuses to operate, the power system faults are expanded, and the safe operation of the system is threatened.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for preventing protection malfunction or refusal caused by a direct current system ground fault, which are characterized in that a contact opening and closing logic judging unit is additionally arranged on one side of a closing coil and a tripping coil close to the positive electrode of the direct current system so as to control the closing coil and the tripping coil to still be correctly inactive or act under the direct current system ground fault, namely, the protection malfunction or refusal is not generated, thereby effectively preventing the protection malfunction or refusal caused by the direct current system ground fault.
The invention provides a device for preventing protection misoperation or refusal operation caused by a direct current system ground fault, which comprises a power supply, a first control device group, a closing coil, a second control device group, a tripping coil, a first contact opening and closing logic judgment unit and a second contact opening and closing logic judgment unit, wherein the first control device group is connected with the power supply;
The first control device group and the closing coil are connected in series between the positive pole and the negative pole of the power supply, and the second control device group and the tripping coil are connected in series between the positive pole and the negative pole of the power supply;
The first contact opening and closing logic judging unit is arranged on one side of the closing coil close to the positive electrode of the power supply, and the second contact opening and closing logic judging unit is arranged on one side of the tripping coil close to the positive electrode of the power supply;
the first contact opening and closing logic judging unit and the second contact opening and closing logic judging unit have the same structure;
The first contact opening and closing logic judging unit is used for detecting and judging the opening or closing state of the contacts of the first control device group so as to control the closing coil to still be correctly inactive or act under the condition of a direct current system grounding fault;
The second contact opening and closing logic judging unit is used for detecting and judging the contact opening or closing state of the second control device group so as to control the tripping coil to still be correctly inactive or act under the condition of the grounding fault of the direct current system.
Preferably, the first contact opening and closing logic judging unit or the second contact opening and closing logic judging unit comprises an information acquisition module, an information conversion module, an information transmission module, a logic judging module and a normally open node executing module;
the information acquisition module is used for acquiring the state value of the opening or closing of the contact of the first control device group or the second control device group in real time and transmitting the acquired state value information to the information conversion module in real time;
The information conversion module is used for converting the state value information received from the information acquisition module into signals required by the information transmission module;
the information transmission module is used for transmitting the signals received from the information conversion module to the logic judgment module in real time;
the logic judgment module is used for performing logical AND operation on the signals transmitted back by the information transmission module;
The normally open node executing module is used for keeping normally open or executing closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil can still be correctly not operated or operated under the condition of the grounding fault of the direct current system.
Preferably, the power supply further comprises a first power switch and a second power switch; the first power switch is connected between the power anode and the first control device group; the second power switch is connected between the closing coil and the negative electrode of the power supply.
Preferably, the first control device group and the second control device group each comprise a plurality of control devices.
The invention also provides a method for preventing the protection malfunction or refusal operation caused by the grounding fault of the direct current system, which is used for the device for preventing the protection malfunction or refusal operation caused by the grounding fault of the direct current system, and comprises the following steps:
the information acquisition module acquires the state value of the opening or closing of the contact of the first control device group or the second control device group in real time, and transmits the acquired state value information to the information conversion module in real time;
The information conversion module converts the state value information received from the information acquisition module into signals required by the information transmission module;
The information transmission module transmits the signals received from the information conversion module to the logic judgment module in real time;
the logic judgment module performs logical AND operation on the signals transmitted back by the information transmission module;
and the normally open node executing module keeps normally open or executes closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil is controlled to still be correctly inactive or act under the condition of the grounding fault of the direct current system.
Preferably, the state value of the contact opening of any one of the first control device group or the second control device group is 0; the state value of contact closure of any one control device in the first control device group or the second control device group is 1.
Preferably, the result calculated by the logic judgment module comprises 1 or 0; if the contacts of the first control device group or the second control device group are in a closed state, the calculated result of the logic judgment module is 1; if only one of the contacts of the first control device group or the second control device group is in an open state, the result calculated by the logic judgment module is 0.
Preferably, the normally open node executing module keeps normally open or executes closing according to the result calculated by the logic judging module, including:
If the result calculated by the logic judging module is 0, keeping the normally open node normally open; if the result calculated by the logic judging module is 1, closing the normally open node.
Preferably, the normally open node executing module is configured to keep normally open or execute closing according to a result calculated by the logic judging module, so as to control the closing coil or the tripping coil to still be able to correctly not act or act under a direct current system ground fault, including:
When the normally open node executing module is kept normally open according to the result calculated by the logic judging module, if the two ends of the first control device group are grounded through a direct current system, the closing coil does not act, namely false operation is avoided;
when the normally open node executing module is kept normally open according to the result calculated by the logic judging module, if the two ends of the second control device group are grounded through a direct current system, the tripping coil does not act, namely false operation is avoided.
Preferably, the normally open node executing module is configured to keep normally open or execute closing according to a result calculated by the logic judging module, so as to control the closing coil or the tripping coil to still be able to correctly not act or act under a direct current system ground fault, and further includes:
when the normally open node executing module executes closing according to the result calculated by the logic judging module, if the first contact opening and closing logic judging module and two ends of the closing coil are grounded through a direct current system, the closing coil acts, namely, the closing coil cannot be refused;
When the normally open node executing module executes closing according to the result calculated by the logic judging module, if the second contact opening and closing logic judging module and two ends of the tripping coil are grounded through a direct current system, the tripping coil acts, namely, the tripping coil cannot be refused.
Due to the adoption of the technical scheme, the invention has the following advantages:
(1) A logic judging function is added to confirm the opening and closing states of the contacts of each control device group, so that the correct action logic required by the grounding underground protection of the direct current system is accurately identified;
(2) The normally open node executing function is added, an executing breakpoint is manufactured, and the action behaviors of the closing coil and the tripping coil are accurately controlled in cooperation with the logic judging function, so that the grounding interference of the direct current system is eliminated, and the action on demand is ensured;
(3) The advantages of special private network and 5G non-delay of the intelligent substation are fully utilized, real-time transmission, calculation, judgment and execution are carried out, and the interference of the grounding of the direct current system on the protection correct action is effectively eliminated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and other drawings may be obtained according to these drawings for those skilled in the art.
FIG. 1 is a schematic diagram of an apparatus for preventing malfunction or rejection caused by a DC system ground fault according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another apparatus for preventing malfunction or rejection caused by a DC system ground fault according to an embodiment of the present invention;
Fig. 3 is a flow chart of a method for preventing malfunction or rejection caused by a ground fault of a dc system according to an embodiment of the invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein it is apparent that the examples described are only some, but not all, of the examples of the present invention. All other embodiments obtained by those skilled in the art are intended to fall within the scope of the embodiments of the present invention.
Referring to fig. 1, the present invention provides an embodiment of a device for preventing malfunction or rejection of protection caused by a ground fault of a dc system, the device including a power source, a first control device group, a closing coil, a second control device group, a trip coil, a first contact opening and closing logic judgment unit, and a second contact opening and closing logic judgment unit;
the first control device group and the switching-on coil are connected in series between the positive electrode and the negative electrode of the power supply, and the second control device group and the tripping coil are connected in series between the positive electrode and the negative electrode of the power supply;
the first contact opening and closing logic judging unit is arranged on the side, close to the positive electrode of the power supply, of the closing coil, and the second contact opening and closing logic judging unit is arranged on the side, close to the positive electrode of the power supply, of the tripping coil;
The first contact opening and closing logic judging unit and the second contact opening and closing logic judging unit have the same structure;
The first contact opening and closing logic judging unit is used for detecting and judging the contact opening or closing state of the first control device group so as to control the closing coil to still be correctly inactive or act under the condition of the grounding fault of the direct current system, namely, protection misoperation or refusal action cannot occur, and therefore protection misoperation or refusal action caused by the grounding fault of the direct current system is effectively prevented;
The second contact opening and closing logic judging unit is used for detecting and judging the contact opening or closing state of the second control device group so as to control the tripping coil to still be correctly inactive or act under the condition of the grounding fault of the direct current system, namely, the protection malfunction or refusal action cannot occur, and therefore the protection malfunction or refusal action caused by the grounding fault of the direct current system is effectively prevented.
In this embodiment, the first contact opening and closing logic determination unit or the second contact opening and closing logic determination unit includes an information acquisition module, an information conversion module, an information transmission module, a logic determination module, and a normally open node execution module;
the information acquisition module is used for acquiring the state value of the opening or closing of the contact of the first control device group or the second control device group in real time and transmitting the acquired state value information to the information conversion module in real time;
the information conversion module is used for converting the state value information received from the information acquisition module into signals required by the information transmission module;
the information transmission module is used for transmitting the signals received from the information conversion module to the logic judgment module in real time;
The logic judgment module is used for performing logical AND operation on the signals transmitted back by the information transmission module;
The normally open node executing module is used for keeping normally open or executing closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil can still be correctly not operated or operated under the condition of the grounding fault of the direct current system, namely, protection misoperation or refusal can not occur.
In this embodiment, the power supply further includes a first power switch and a second power switch; the first power switch is connected between the positive electrode of the power supply and the first control device group; the second power switch is connected between the closing coil and the negative electrode of the power supply.
In this embodiment, the first control device group and the second control device group each include a plurality of control devices.
Referring to fig. 2, the present invention provides an embodiment of a device for preventing protection malfunction or rejection caused by a dc system ground fault, and this embodiment provides a specific structural manner of the first contact switch logic determination unit and the second contact switch logic determination unit in fig. 1. The first contact switch logic judging unit and the second contact switch logic judging unit comprise logic judging units and normally open nodes. When the output result of the logic judging unit is 1, the normally open node is controlled to be closed; and when the output result of the logic judging unit is 0, controlling the normally open node to be kept normally open.
Referring to fig. 3, the present invention further provides an embodiment of a method for preventing protection malfunction or rejection caused by a dc system ground fault, which is used for the device for preventing protection malfunction or rejection caused by a dc system ground fault, and the method includes:
S201: the information acquisition module acquires the state value of the opening or closing of the contact of the first control device group or the second control device group in real time, and transmits the acquired state value information to the information conversion module in real time;
s202: the information conversion module converts the state value information received from the information acquisition module into signals required by the information transmission module;
S203: the information transmission module transmits the signals received from the information conversion module to the logic judgment module in real time;
S204: the logic judgment module performs logical AND operation on the signals transmitted back by the information transmission module;
s205: the normally open node executing module keeps normally open or executes closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil can still be correctly disabled or operated under the condition of the grounding fault of the direct current system.
The embodiment can realize that the control switch-on coil or the tripping coil can still correctly not act or act under the ground fault of the direct current system, namely, the protection misoperation or refusal can not occur.
In the present embodiment, the state value of the contact opening of any one of the first control device group or the second control device group is 0; the state value of the contact closure of any one of the first control device group or the second control device group is 1.
In this embodiment, the result calculated by the logic judgment module includes 1 or 0; if the contacts of the first control device group or the second control device group are in a closed state, the calculated result of the logic judgment module is 1; if only one of the contacts of the first control device group or the second control device group is in an open state, the result calculated by the logic judgment module is 0.
In this embodiment, the normally open node executing module keeps normally open or executes closure according to the result calculated by the logic judging module, including:
If the result calculated by the logic judging module is 0, keeping the normally open node normally open; if the result calculated by the logic judging module is 1, closing the normally open node.
In this embodiment, the normally open node executing module is configured to keep normally open or execute closing according to a result calculated by the logic judging module, so as to control the closing coil or the tripping coil to still be able to correctly not act or act under the ground fault of the dc system, that is, to avoid occurrence of protection malfunction or refusal, including:
When the normally open node execution module is kept normally open according to the result calculated by the logic judgment module, if the direct current system is grounded at two ends of the first control device group, the closing coil does not act, namely false operation is avoided;
When the normally open node executing module is kept normally open according to the result calculated by the logic judging module, if the direct current system is grounded at two ends of the second control device group, the tripping coil does not act, namely false operation is avoided.
In this embodiment, the normally open node executing module is configured to keep normal open or execute closing according to a result calculated by the logic judging module, so as to control the closing coil or the tripping coil to still be able to correctly not act or act under the ground fault of the dc system, that is, to avoid occurrence of protection malfunction or refusal, and further includes:
When the normally open node executing module executes closing according to the result calculated by the logic judging module, if the first contact opening and closing logic judging module and two ends of the closing coil are grounded through a direct current system, the closing coil acts, namely the closing coil cannot be refused;
When the normally open node executing module executes closing according to the result calculated by the logic judging module, if the second contact opening and closing logic judging module and two ends of the tripping coil are grounded through a direct current system, the tripping coil acts, namely, the tripping coil cannot be refused.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The device for preventing the direct current system ground fault from causing the protection malfunction or refusing the operation is characterized by comprising a power supply, a first control device group, a closing coil, a second control device group, a tripping coil, a first contact opening and closing logic judgment unit and a second contact opening and closing logic judgment unit;
The first control device group and the closing coil are connected in series between the positive pole and the negative pole of the power supply, and the second control device group and the tripping coil are connected in series between the positive pole and the negative pole of the power supply;
The first contact opening and closing logic judging unit is arranged on one side of the closing coil close to the positive electrode of the power supply, and the second contact opening and closing logic judging unit is arranged on one side of the tripping coil close to the positive electrode of the power supply;
the first contact opening and closing logic judging unit and the second contact opening and closing logic judging unit have the same structure;
The first contact opening and closing logic judging unit is used for detecting and judging the opening or closing state of the contacts of the first control device group so as to control the closing coil to still be correctly inactive or act under the condition of a direct current system grounding fault;
The second contact opening and closing logic judging unit is used for detecting and judging the contact opening or closing state of the second control device group so as to control the tripping coil to still be correctly inactive or act under the condition of the grounding fault of the direct current system.
2. The apparatus of claim 1, wherein the first contact opening and closing logic determination unit or the second contact opening and closing logic determination unit comprises an information acquisition module, an information conversion module, an information transmission module, a logic determination module, and a normally open node execution module;
the information acquisition module is used for acquiring the state value of the opening or closing of the contact of the first control device group or the second control device group in real time and transmitting the acquired state value information to the information conversion module in real time;
The information conversion module is used for converting the state value information received from the information acquisition module into signals required by the information transmission module;
the information transmission module is used for transmitting the signals received from the information conversion module to the logic judgment module in real time;
the logic judgment module is used for performing logical AND operation on the signals transmitted back by the information transmission module;
The normally open node executing module is used for keeping normally open or executing closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil can still be correctly not operated or operated under the condition of the grounding fault of the direct current system.
3. The apparatus of claim 1, further comprising a first power switch and a second power switch; the first power switch is connected between the power anode and the first control device group; the second power switch is connected between the closing coil and the negative electrode of the power supply.
4. The device of claim 1, wherein the first set of control devices and the second set of control devices each comprise a number of control devices.
5. A method for preventing protection malfunction or rejection caused by a dc system ground fault, for the device for preventing protection malfunction or rejection caused by a dc system ground fault according to any one of claims 1 to 4, the method comprising:
The information acquisition module acquires the state value of the opening or closing of the contact of the first control device group or the second control device group in real time, and transmits the acquired state value information to the information conversion module in real time;
the information conversion module converts the state value information received from the information acquisition module into signals required by the information transmission module;
The information transmission module transmits the signals received from the information conversion module to the logic judgment module in real time;
The logic judgment module performs logical AND operation on the signals transmitted back by the information transmission module;
The normally open node executing module keeps normally open or executes closing according to the result calculated by the logic judging module, so that the closing coil or the tripping coil can still be correctly disabled or operated under the condition of the grounding fault of the direct current system.
6. The method according to claim 5, wherein a state value of contact opening of any one of the first control device group or the second control device group is 0; the state value of contact closure of any one control device in the first control device group or the second control device group is 1.
7. The method of claim 6, wherein the result calculated by the logic determination module comprises 1 or 0; if the contacts of the first control device group or the second control device group are in a closed state, the calculated result of the logic judgment module is 1; if only one of the contacts of the first control device group or the second control device group is in an open state, the result calculated by the logic judgment module is 0.
8. The method of claim 5, wherein the normally open node execution module maintains a normally open or performs a closed state according to a result calculated by the logic determination module, comprising:
If the result calculated by the logic judging module is 0, keeping the normally open node normally open; if the result calculated by the logic judging module is 1, closing the normally open node.
9. The method according to claim 5, wherein the normally open node execution module is configured to keep normally open or execute closing according to a result calculated by the logic determination module, so as to control the closing coil or the trip coil to still be correctly inactive or active under a dc system ground fault, and the method comprises:
When the normally open node executing module is kept normally open according to the result calculated by the logic judging module, if the two ends of the first control device group are grounded through a direct current system, the closing coil does not act, namely false operation is avoided;
when the normally open node executing module is kept normally open according to the result calculated by the logic judging module, if the two ends of the second control device group are grounded through a direct current system, the tripping coil does not act, namely false operation is avoided.
10. The method of claim 5, wherein the normally open node execution module is configured to keep normally open or execute closing according to a result calculated by the logic determination module, so as to control the closing coil or the trip coil to still be correctly inactive or active under a dc system ground fault, and further comprising:
when the normally open node executing module executes closing according to the result calculated by the logic judging module, if the first contact opening and closing logic judging module and two ends of the closing coil are grounded through a direct current system, the closing coil acts, namely, the closing coil cannot be refused;
When the normally open node executing module executes closing according to the result calculated by the logic judging module, if the second contact opening and closing logic judging module and two ends of the tripping coil are grounded through a direct current system, the tripping coil acts, namely, the tripping coil cannot be refused.
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