CN114400623B - Low-voltage side fault removal protection system and method under direct current power loss of transformer substation - Google Patents
Low-voltage side fault removal protection system and method under direct current power loss of transformer substation Download PDFInfo
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- CN114400623B CN114400623B CN202210071207.2A CN202210071207A CN114400623B CN 114400623 B CN114400623 B CN 114400623B CN 202210071207 A CN202210071207 A CN 202210071207A CN 114400623 B CN114400623 B CN 114400623B
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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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
Abstract
The invention discloses a low-voltage side fault removal protection system and a low-voltage side fault removal protection method under direct current power loss of a transformer substation in the technical field of relay protection devices of the transformer substation, which are applied to a low-voltage fault direct current voltage loss protection device configured by the transformer substation at the current side, and comprise the following steps: detecting whether the low-voltage side of the transformer substation on the side has a fault or not; collecting switching values and analog values when the direct-current power supply fails to be in voltage loss in response to the low-voltage side of the substation on the side; judging the fault and the direct current power loss of the substation on the side based on the switching values and the analog values to obtain a judgment result; and sending the judgment result of the substation on the side to the step-down fault direct-current voltage loss protection device of the substation on the opposite side through the optical fiber channel, wherein the step-down fault direct-current voltage loss protection device of the substation on the opposite side performs on-off control on a circuit breaker communicated with the substation on the side according to the judgment result. The invention can isolate the fault transformer substation, eliminates the fault development and expands, has wide applicability and higher practicability and can be widely applied to the transformer substation.
Description
Technical Field
The invention relates to a low-voltage side fault removal protection system and method under direct current power loss of a transformer substation, and belongs to the technical field of relay protection devices of transformer substations.
Background
The direct-current power supply in the transformer substation is an indispensable power supply for the work of numerous equipment such as relay protection, communication and circuit breakers of the whole transformer substation, if direct-current power failure of the whole transformer substation causes direct current power loss, the relay protection equipment, the communication equipment, circuit breaker switches and other equipment in the transformer substation cannot operate, the operation state of the transformer substation becomes a black box, the middle-high voltage transformer substation is unattended at present, therefore, the operation condition of the transformer substation cannot be acquired, the control cannot be performed, and meanwhile, primary equipment operates in an unprotected state.
The direct-current power supply of a transformer substation is taken from the low-voltage side of the transformer substation, the direct-current power supply fault loss is caused by the fault of the low-voltage side of the transformer substation, the direct-current power supply of the whole transformer substation is lost due to the fault of the low-voltage side of the transformer substation, at the moment, the relay protection loses the power supply and cannot operate, the fault of the transformer substation cannot be removed by action of local protection, meanwhile, due to the fact that along with the enhancement of a power system, the short-circuit current of the power system is large, a high-resistance transformer is adopted in the system for limiting the short-circuit current, the fault current sensed by the transformer substation is small when the low-voltage side of the transformer fails, the connecting line of the fault station cannot be removed by action of remote backup protection of the side station, the fault persists, the fault further develops to cause serious accidents, the direct-current power loss of the transformer substation in the current engineering causes the ignition and explosion of the transformer, and great influence and threat are caused to the power grid.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides the low-voltage side fault removal protection system and the low-voltage side fault removal protection method under the condition of direct current power loss of the transformer substation, can isolate the fault transformer substation, eliminate the fault development and expand, has wide applicability and higher practicability, and can be widely applied to the transformer substation.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a method for protecting against a low-voltage side fault in case of a dc loss of a substation, which is applied to a low-voltage side fault dc loss protection device configured in a substation on the same side, and includes:
detecting whether the low-voltage side of the transformer substation on the side has a fault or not;
collecting switching values and analog values when the direct-current power supply fails to be in voltage loss in response to the low-voltage side of the substation on the side;
judging the fault and the direct current power loss of the substation on the side based on the switching values and the analog values to obtain a judgment result;
and transmitting the judgment result of the substation on the side to the step-down fault direct-current voltage loss protection device of the substation on the opposite side through an optical fiber channel, wherein the step-down fault direct-current voltage loss protection device of the substation on the opposite side performs on-off control on a circuit breaker communicated with the substation on the side according to the judgment result.
Further, the switching values and the analog values include: the transformer protection device comprises a differential protection action output signal of the transformer protection device, channel interrupt signals of the transformer substation at the side and the transformer substation at the opposite side of the transformer substation low-fault direct current voltage loss protection device, and output analog quantity and two-way direct current power supply input signals of current transformers at the high-voltage side and the low-voltage side of the transformer.
Further, the judgment conditions for judging the fault and the direct current power loss of the substation on the side based on the switching values and the analog values are as follows:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity, wherein the high-voltage side current is larger than the setting current by a current transformer;
and (2) carrying out a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
and when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, judging that direct current is lost due to a fault, and sending a fault direct current loss signal to the transformer-down fault direct current loss protection device of the opposite side transformer substation by the transformer-down fault direct current loss protection device of the local side transformer substation.
Further, the step-down fault direct current voltage loss protection device of the side transformer substation performs on-off control on the circuit breaker of the side transformer substation according to the judgment result, and the step-down fault direct current voltage loss protection device comprises: and when the transformer-reducing fault direct-current voltage-loss protection device of the opposite side transformer substation receives the fault direct-current voltage-loss signal and the channel interrupt signals of the transformer-reducing fault direct-current voltage-loss protection device of the current side transformer substation and the transformer-reducing fault direct-current voltage-loss protection device of the opposite side transformer substation, tripping off a circuit breaker communicated with the transformer substation on the side for fault isolation.
In a second aspect, the present invention provides a low-voltage side fault removal protection system under a dc power loss of a transformer substation, including: the transformer substation comprises a low-voltage fault direct-current voltage-loss protection device, a transformer, a high-voltage side current transformer, a low-voltage side current transformer and a breaker, wherein the substation on the current side and the substation on the opposite side are connected through the breaker;
the transformer-reduction fault direct-current voltage loss protection device configured on the local side transformer substation detects whether the low-voltage side of the local side transformer substation has fault direct-current power supply voltage loss or not, collects each switching value and analog quantity when the low-voltage side of the local side transformer substation has the fault direct-current power supply voltage loss, and judges the fault and direct-current power loss of the local side transformer substation based on each switching value and analog quantity to obtain a judgment result; the judgment result of the substation on the side is sent to a low-voltage-changing fault direct-current voltage-loss protection device of the substation on the opposite side through an optical fiber channel;
and the low-transformer fault direct current voltage loss protection device arranged at the opposite side transformer substation controls the breaker communicated with the transformer substation at the side to be switched on or switched off according to the judgment result.
Further, the switching values and the analog values include: the differential protection action output signal of the transformer protection device, the channel interrupt signal of the transformer substation at the side and the transformer substation at the opposite side become the low fault direct current no-voltage protection device, the output analog quantity of the current transformers at the high voltage side and the low voltage side of the transformer and the two-way direct current power supply input signal.
Further, the judgment conditions for judging the fault and the direct current power loss of the substation on the side based on the switching values and the analog values are as follows:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity, wherein the high-voltage side current is larger than the setting current by a current transformer;
and a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
and when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, the direct-current power loss caused by the fault is judged, and the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the side sends a fault direct-current voltage-loss signal to the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the opposite side.
Further, when the transformer substation low-fault direct-current voltage-loss protection device of the opposite side transformer substation receives the fault direct-current voltage-loss signal and the channel interrupt signals of the transformer substation of the side transformer substation and the transformer substation low-fault direct-current voltage-loss protection device of the opposite side transformer substation, the breaker communicated with the transformer substation of the side is tripped for fault isolation.
Compared with the prior art, the invention has the following beneficial effects:
the scheme provides a protection design scheme for preventing low-voltage side faults under the condition of direct current power loss of a transformer substation from being removed, the scheme is characterized in that a step-down fault direct current voltage loss protection device is configured in the transformer substation, the characteristic that the step-down fault direct current voltage loss protection device can keep hundreds of milliseconds after power failure is utilized, when the low-voltage side of the transformer substation breaks down, the step-down fault direct current voltage loss protection device outputs signals through collecting differential protection actions of the transformer protection device, line channel interrupt signals, transformer high-voltage side and low-voltage side current analog quantities and a two-section direct current power supply switching-in signal, faults and direct current power loss are judged, a judgment result is sent to an opposite-side transformer substation through an optical fiber channel, the opposite-side transformer substation is disconnected from a fault line after receiving the fault signals, the fault transformer substation is isolated, fault development is eliminated and expanded, and the scheme has wide applicability and high practicability and can be widely applied to the transformer substation.
Drawings
Fig. 1 is a schematic configuration diagram of a protection scheme apparatus according to a first embodiment of the present invention;
fig. 2 is a logic diagram for determining a fault of the low-fault dc/dc voltage loss protection device according to an embodiment of the present invention;
fig. 3 is a logic diagram of the trip of the low-fault dc-to-dc voltage loss protection device according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
a low-voltage side fault removal protection method under direct current power loss of a transformer substation comprises the following steps:
s1: referring to fig. 1, a low-fault dc voltage loss protection device is configured in both the local substation and the opposite substation;
s2: when this side transformer substation low pressure side broke down DC power supply and lose voltage, utilize the step-down trouble DC voltage loss protection device to fall and can keep hundreds of milliseconds's characteristic after the electricity, step-down trouble DC voltage loss protection device carries out each switching value and analog acquisition, includes: acquiring a differential protection action output signal of a transformer protection device, a channel interrupt signal of a corresponding line protection device (namely a transformer substation at the side and a transformer substation at the opposite side become low fault direct current no-voltage protection device), and an output analog quantity and a two-way direct current power supply input signal of a current transformer at the high-voltage side and the low-voltage side of the transformer;
s3: referring to fig. 2, the step-down fault dc/dc voltage loss protection device performs local substation fault and dc/dc power loss determination based on the protection action signal, the channel interrupt signal, the current analog quantity and the two-way dc power supply input signal to obtain a determination result of the local substation, where the determination condition is:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity by a current transformer, wherein the high-voltage side current is larger than a setting current;
and a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, the direct-current power loss caused by the fault is judged, and at the moment, the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the side sends a fault direct-current voltage-loss signal to the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the opposite side;
s4: referring to fig. 3, the determination result of the substation on the local side is sent to the dc voltage loss protection device for the substation on the opposite side through the optical fiber channel, for example, when the dc voltage loss protection device for the substation on the opposite side receives the dc voltage loss signal and the channel interrupt signal of the dc voltage loss protection device for the substation on the local side and the substation on the opposite side, the breaker in communication with the substation on the local side is tripped, the fault is isolated, and the further development of the fault is eliminated. The scheme has wide applicability and higher practicability and can be widely applied to the transformer substation.
Example two:
the embodiment of the invention also provides a system for protecting the fault removal of the low-voltage side of the substation in the case of direct current power loss, which can realize the method for protecting the fault removal of the low-voltage side of the substation in the case of direct current power loss in the embodiment, and the method comprises the following steps that: the transformer substation comprises a low-voltage fault direct current voltage loss protection device, a transformer, a high-voltage side current transformer, a low-voltage side current transformer and a circuit breaker, wherein the local side transformer substation and the opposite side transformer substation are connected through the circuit breaker;
the transformer-reducing fault direct-current voltage loss protection device configured in the transformer substation on the side detects whether the low-voltage side of the transformer substation on the side has fault direct-current power supply voltage loss, and collects switching values and analog quantities when responding to the fault direct-current power supply voltage loss of the low-voltage side of the transformer substation on the side, wherein the switching values and the analog quantities comprise: differential protection action output signals of the transformer protection device, channel interrupt signals of the transformer substation at the side and the transformer substation at the opposite side become low fault direct current voltage loss protection device, and output analog quantity and two-way direct current power supply input signals of current transformers at the high voltage side and the low voltage side of the transformer; the fault and the dc loss of the local substation are determined based on the switching values and the analog values to obtain determination results, and it should be noted that the conditions for determining the fault and the dc loss of the local substation based on the switching values and the analog values are as follows:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity, wherein the high-voltage side current is larger than the setting current by a current transformer;
and a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
and when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, the direct-current power loss caused by the fault is judged, and the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the side sends a fault direct-current voltage-loss signal to the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the opposite side. And then, the judgment result of the substation on the side is sent to the transformer-reducing fault direct-current voltage-loss protection device of the substation on the opposite side through the optical fiber channel, wherein when the transformer-reducing fault direct-current voltage-loss protection device of the substation on the opposite side receives a fault direct-current voltage-loss signal and channel interruption signals of the transformer-reducing fault direct-current voltage-loss protection device of the substation on the side and the transformer-reducing fault direct-current voltage-loss protection device of the substation on the opposite side, the breaker communicated with the transformer substation on the side is tripped for fault isolation, and the transformer-reducing fault direct-current voltage-loss protection device arranged in the transformer substation on the opposite side performs on-off control on the breaker communicated with the transformer substation on the side according to the judgment result.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A low-voltage side fault removal protection method under direct current power loss of a transformer substation is characterized in that a low-voltage fault direct current voltage loss protection device applied to configuration of the transformer substation on the current side comprises the following steps:
detecting whether the low-voltage side of the transformer substation on the side has a fault or not;
collecting switching values and analog values when the direct-current power supply fails to be in voltage loss in response to the low-voltage side of the substation on the side;
judging the fault and the direct current power loss of the substation on the side based on the switching values and the analog values to obtain a judgment result;
the judgment result of the substation on the side is sent to a low-fault direct-current voltage-loss protection device of the substation on the opposite side through an optical fiber channel, wherein the low-fault direct-current voltage-loss protection device of the substation on the opposite side performs on-off control on a circuit breaker communicated with the substation on the side according to the judgment result;
each switching value and analog value comprises: differential protection action output signals of the transformer protection device, channel interrupt signals of the transformer substation at the side and the transformer substation at the opposite side become low fault direct current voltage loss protection device, and output analog quantity and two-way direct current power supply input signals of current transformers at the high voltage side and the low voltage side of the transformer;
the judgment conditions for judging the fault and the direct current power loss of the transformer substation on the side of the transformer substation based on the switching values and the analog values are as follows:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity, wherein the high-voltage side current is larger than the setting current by a current transformer;
and a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
and when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, judging that direct current is lost due to a fault, and sending a fault direct current loss signal to the transformer-down fault direct current loss protection device of the opposite side transformer substation by the transformer-down fault direct current loss protection device of the local side transformer substation.
2. The method for protecting the fault removal of the low-voltage side under the direct-current power loss of the transformer substation according to claim 1, wherein the step-down fault direct-current voltage loss protection device of the transformer substation on the opposite side performs on-off control on a breaker of the transformer substation on the side according to the judgment result, and the method comprises the following steps of: and when the transformer substation low-fault direct-current voltage-loss protection device of the opposite side transformer substation receives the fault direct-current voltage-loss signal and the channel interrupt signals of the transformer substation of the side and the transformer substation low-fault direct-current voltage-loss protection device of the opposite side transformer substation, tripping off a breaker communicated with the transformer substation of the side for fault isolation.
3. The utility model provides a low pressure side fault excision protection system under transformer substation's direct current loses the electricity, characterized by disposes respectively in this side transformer substation and offside transformer substation: the transformer substation comprises a low-voltage fault direct current voltage loss protection device, a transformer, a high-voltage side current transformer, a low-voltage side current transformer and a circuit breaker, wherein the local side transformer substation and the opposite side transformer substation are connected through the circuit breaker;
the transformer-reduction fault direct-current voltage loss protection device configured in the local substation detects whether the low-voltage side of the local substation has fault direct-current power supply voltage loss or not, collects each switching value and analog quantity when the low-voltage side of the local substation has the fault direct-current power supply voltage loss, and judges the fault and direct-current power loss of the local substation based on each switching value and analog quantity to obtain a judgment result; the judgment result of the substation on the side is sent to a low-voltage-changing fault direct-current voltage-loss protection device of the substation on the opposite side through an optical fiber channel;
the step-down fault direct-current voltage loss protection device arranged on the opposite side transformer substation performs on-off control on a circuit breaker communicated with the side transformer substation according to the judgment result;
each switching value and analog value comprises: differential protection action output signals of the transformer protection device, channel interrupt signals of the transformer substation at the side and the transformer substation at the opposite side become low fault direct current voltage loss protection device, and output analog quantity and two-way direct current power supply input signals of current transformers at the high voltage side and the low voltage side of the transformer;
the judgment conditions for judging the fault and the direct current power loss of the transformer substation on the side of the transformer substation based on the switching values and the analog values are as follows:
the first condition is as follows: receiving a differential protection action output signal of a transformer protection device, and outputting analog quantity, wherein the high-voltage side current is larger than the setting current by a current transformer;
and a second condition: the current transformer outputs analog quantity, and the current of the medium and low voltage side is larger than the setting current;
and when the condition I or the condition II is met and the two-way direct-current power supply switching-in signal disappears, the direct-current power loss caused by the fault is judged, and the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the side sends a fault direct-current voltage-loss signal to the low-voltage-changing fault direct-current voltage-loss protection device in the substation on the opposite side.
4. The system for fault removal on the low-voltage side under the direct-current power loss of the transformer substation according to claim 3, wherein when the low-voltage fault direct-current voltage loss protection device of the opposite-side transformer substation receives a fault direct-current power loss signal and channel interruption signals of the low-voltage fault direct-current voltage loss protection devices of the transformer substation on the side and the transformer substation on the opposite side, a breaker communicated with the transformer substation on the side is tripped for fault isolation.
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| US7345863B2 (en) * | 2005-07-14 | 2008-03-18 | Schweitzer Engineering Laboratories, Inc. | Apparatus and method for identifying a loss of a current transformer signal in a power system |
| CN104079066B (en) * | 2013-10-30 | 2015-07-08 | 中国南方电网有限责任公司 | Method for judging disappearance of secondary direct-current power supply of far-end transformer substation |
| CN104977546B (en) * | 2015-06-29 | 2018-01-16 | 广东电网有限责任公司江门供电局 | A kind of Secondary Direct Electrical Resources towards transformer station lose method of discrimination |
| CN105048420A (en) * | 2015-08-28 | 2015-11-11 | 南京南瑞继保电气有限公司 | Secondary direct current power failure protection method for substation |
| CN110165642B (en) * | 2019-06-26 | 2021-12-21 | 广东电网有限责任公司 | Wide area protection method, device and equipment for dealing with direct current voltage loss of adjacent transformer substations |
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