CN112332370A - Transformer protection method and device, relay protector and power supply system - Google Patents
Transformer protection method and device, relay protector and power supply system Download PDFInfo
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- CN112332370A CN112332370A CN202011263269.0A CN202011263269A CN112332370A CN 112332370 A CN112332370 A CN 112332370A CN 202011263269 A CN202011263269 A CN 202011263269A CN 112332370 A CN112332370 A CN 112332370A
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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
- 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
- H02H3/006—Calibration or setting of parameters
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Abstract
The invention provides a transformer protection method, a device, relay protectors and a power supply system, which are applied to the technical field of power supply and distribution, the method provides a preset corresponding relation between a topological structure of the power supply system and a protective current setting value, any relay protector determines a target protective current setting value corresponding to the current topological structure of the power supply system based on the preset corresponding relation after acquiring topological structure information of the power supply system, and also acquires incoming line side current of a transformer in a power supply subsystem and arc light detection signals of arc light sensors in the power supply subsystem, and when the incoming line side current is more than or equal to the target protective current setting value and the arc light detection signals represent that arc light is detected, the connection between the transformer in the power supply subsystem and a power supply network is disconnected, the scheme considers both protection sensitivity and protection stability, the transformer protection method can solve the problems existing in the transformer protection method in the prior art.
Description
Technical Field
The invention belongs to the technical field of power supply and distribution, and particularly relates to a transformer protection method and device, a relay protector and a power supply system.
Background
In order to ensure the power supply safety, most transformers in a power supply system realize overcurrent protection based on a relay protector. Specifically, the relay protector collects incoming line side current of the transformer, compares the obtained incoming line side current with a preset protective current setting value, and executes a preset protection action under the condition that the incoming line side current is greater than or equal to the protective current setting value.
In order to avoid the influence on power supply stability caused by misoperation of the relay protector due to load fluctuation or measurement errors in the running process of the transformer, the preset protective current setting value of the relay protector is large, for example, 1.5-2 times of rated current of the transformer is adopted.
The existing transformer protection method can have the following problems when being applied to transformer protection, particularly to protection of special multi-winding transformers: when the special multi-winding transformer runs under light load, particularly for a redundant power supply system provided with a plurality of special multi-winding transformers and loaded at the same time, the primary side current of the special multi-winding transformer is not changed greatly, so that the special multi-winding transformer cannot trigger a relay protector to execute preset protection action although in a fault running state, and further fault amplification is caused; if the protection current setting value is set too low, although the sensitivity of protection can be improved, the protection stability is easily affected. For example, for a redundant power supply system provided with two special multi-winding transformers, when one special multi-winding transformer is out of operation, all loads of the redundant power supply system are borne by the rest special multi-winding transformers in the system, and accordingly, the power supply current of the special multi-winding transformer can be rapidly increased, and a relay protector with a small setting value of the protection current can be triggered by mistake, so that the power failure of the whole redundant power supply system is caused.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a transformer protection method, apparatus, relay protector and power supply system, which flexibly adjust a protection current setting value based on the topology change of a power supply network, thereby improving the protection sensitivity, and simultaneously, assist with arc light detection, and consider the power supply stability, and can effectively solve the problems existing in the transformer protection method in the prior art, and the specific scheme is as follows:
in a first aspect, the present invention provides a transformer protection method applied to a power supply system, the power supply system including at least one power supply subsystem, the power supply subsystem including a transformer, at least one arc sensor for collecting arc light of the transformer, and a relay protector, the method being applied to any one of the relay protectors, the method including:
acquiring topological structure information of the power supply system, incoming line side current of a transformer in the power supply subsystem and arc light detection signals of an arc light sensor in the power supply subsystem;
wherein the topology information characterizes a power supply network topology change of the power supply system;
determining the current topological structure of the power supply system according to the topological structure information;
determining a target protection current setting value corresponding to the current topological structure based on a preset corresponding relation between the topological structure of the power supply system and the protection current setting value;
and if the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light, disconnecting the transformer in the power supply subsystem from the power supply network.
Optionally, the transformer protection method provided in the first aspect of the present invention further includes:
acquiring a standard protection current setting value;
the standard protection current setting value is larger than any one of the protection current setting values included in the preset corresponding relation and the primary side rated current of the transformer in the power supply subsystem;
and if the current on the wire inlet side is greater than or equal to the standard protection current setting value, disconnecting the transformer in the power supply subsystem from the power supply network.
Optionally, if power supply system includes two or more power supply subsystem, just each transformer in the power supply system passes through the inlet wire circuit breaker and is connected with power supply network, acquire power supply system's topological structure information, include:
and acquiring real-time position information of the incoming line circuit breakers of other power supply subsystems except the power supply subsystem in the power supply system.
Optionally, if the power supply system includes one power supply subsystem, the obtaining the topology information of the power supply system includes:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
Optionally, the obtaining the topology information of the power supply system further includes:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
Optionally, the obtaining the topology information of the power supply system includes:
and acquiring topological structure information of the power supply system provided by an upper control system.
Optionally, the disconnecting the transformer in the power supply subsystem from the power supply network includes:
sending a tripping signal to a target incoming line breaker to trip the target incoming line breaker;
the target incoming line breaker is an incoming line breaker which is connected between the incoming line side of a transformer in the power supply subsystem and a power supply network in series.
In a second aspect, the present invention provides a transformer protection device, comprising:
the first acquisition unit is used for acquiring topological structure information of the power supply system, incoming line side current of a transformer in the power supply subsystem and arc light detection signals of an arc light sensor in the power supply subsystem;
wherein the topology information characterizes a power supply network topology change of the power supply system;
the first determining unit is used for determining the current topological structure of the power supply system according to the topological structure information;
the second determining unit is used for determining a target protection current setting value corresponding to the current topological structure based on a preset corresponding relation between the topological structure of the power supply system and the protection current setting value;
and the first control unit is used for disconnecting the transformer in the power supply subsystem from the power supply network if the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light.
In a third aspect, the present invention provides a relay protector, comprising: an actuator and a controller, wherein,
the control end of the execution mechanism is connected with the controller and executes preset actions according to control signals of the controller;
the controller comprises a memory and a processor; the memory stores a program adapted to be executed by the processor to implement the transformer protection method according to any one of the first aspect of the present invention.
In a fourth aspect, the present invention provides a power supply system comprising: at least one power supply subsystem comprising a transformer, at least one arc sensor, an incoming line breaker, and a relay protector according to any of the third aspects of the invention, wherein,
the inlet wire side of the transformer is connected with a power supply network through the inlet wire breaker;
each arc light sensor is arranged at a preset position on the outgoing line side of the transformer and used for carrying out arc light detection on each preset position;
the relay protector is in communication connection with each arc light detector in the power supply subsystem, the incoming line circuit breaker in the power supply subsystem and relay protectors in other power supply subsystems except the power supply subsystem.
The transformer protection method provided by the invention provides a preset corresponding relation between the topological structure of the power supply system and the protection current setting value, the protection current setting value corresponding to the topological structure of the power supply system can be automatically adjusted according to the preset corresponding relation, based on the preset corresponding relation, any relay protector in the power supply system can determine a target protection current setting value corresponding to the current topological structure of the power supply system based on the preset corresponding relation after acquiring the topological structure information of the power supply system, meanwhile, the relay protector can also acquire the incoming line side current of the transformer in the power supply subsystem to which the relay protector belongs and the arc light detection signal of the arc light sensor in the power supply subsystem to which the relay protector belongs, and the transformer in the power supply subsystem is disconnected from the power supply network under the condition that the incoming line side current is more than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light, the protection of the corresponding transformer is improved.
In the scheme, any relay protector in the power supply system can adjust the adopted protective current setting value according to the change of the topological structure of the power supply system, namely the actually adopted protective current setting value can be reduced under the condition of low load or load of each transformer so as to improve the sensitivity of protection, meanwhile, the auxiliary protection method is combined with arc light detection for assistance, the protection can be carried out under the condition that the current on the incoming line side is greater than or equal to the target protective current setting value and the arc light detection signal represents and detects the arc light, and the protection stability is considered, so that the problems of the transformer protection method in the prior art can be effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a transformer protection method according to an embodiment of the present invention;
fig. 2 is a flowchart of another transformer protection method according to an embodiment of the present invention;
fig. 3 is a block diagram of a transformer protection device according to an embodiment of the present invention;
fig. 4 is a block diagram of another transformer protection device according to an embodiment of the present invention;
fig. 5 is a block diagram of a power supply system according to an embodiment of the present invention;
fig. 6 is a block diagram of another power supply system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The transformer protection methods provided in the following embodiments of the present invention may be applied to a power supply system, where the power supply system includes at least one power supply subsystem, and the specific number of the power supply subsystems is not specifically limited in the present invention, and may be set according to actual power supply requirements, and will not be described herein again. For any power supply subsystem, including a transformer, at least one arc light sensor for collecting the arc light of the transformer, and a relay protector for performing overcurrent protection on the transformer, of course, other components in the prior art, such as a low-voltage power distribution part of a power electronic transformation part, an electric energy metering device, etc., may also be included in the power supply subsystem.
Optionally, the arc light sensor in any power supply subsystem can be flexibly arranged according to actual protection requirements, in various embodiments of the invention, the arc light sensor is mainly used for detecting arc light generated by the corresponding transformer in the operation process, especially for collecting arc light of a space within the secondary winding of the transformer and/or the extension range of the secondary side outgoing line thereof, specifically, the arc light sensor can be arranged on the secondary winding of the transformer and a place where the secondary winding is electrically connected externally, such as a connecting terminal led out from the secondary winding, a conductive bus between the secondary winding and a low-voltage cabinet, and the like. Of course, the arc sensor can also be arranged at other positions which are possible to have faults and generate arc light during the operation of the transformer and influence the normal operation of the transformer, and the arc sensor also belongs to the protection scope of the invention without exceeding the core idea scope of the invention.
In practical application, overcurrent protection is mainly performed on a transformer in a power supply system through a relay protector, so that as an optional specific implementation manner, the transformer protection method provided by each embodiment of the invention is applied to each relay protector of each power supply subsystem of the power supply system. Of course, the present invention may also be applied to other controllers capable of running a control program to control the electrical connection between the transformer and the power supply network, and in some cases, the controller may also be implemented by a server on the network side.
Based on the above, referring to fig. 1, fig. 1 is a flowchart of a transformer protection method provided in an embodiment of the present invention, where the flowchart may include:
s100, acquiring topological structure information of a power supply system, incoming line side current of a transformer in the power supply subsystem and arc light detection signals of an arc light sensor in the power supply subsystem.
In this embodiment, the topology information of the power supply system is mainly used for characterizing the topology change of the power supply network of the power supply system. For example, the power supply system is provided with three power supply subsystems, and the three power supply subsystems are defined as a first topological structure when in normal on-load operation; when one of the power supply subsystems quits operation due to a certain reason, the power supply subsystem quitting operation does not have electrical connection for the whole power supply system, and in this case, the power supply network of the power supply system can be defined as a topology structure II, and so on, and details are not repeated.
It is emphasized that, for a power supply system comprising only one power supply subsystem, which comprises only one transformer therein, in this application scenario, the change in the topology of the power supply network of the power supply system is mainly caused by the change in the connection condition between the transformer and the load. For example, for some special applications, the secondary side of the multi-winding transformer may be divided equally into a plurality of groups, and under a normal operation condition, all windings are loaded simultaneously, for example, if a certain group of loads is cut off due to a fault (the loads corresponding to a plurality of windings are cut off), the transformer is in a load imbalance state, and it can be considered that the topology structure of the power supply system changes. In a broad sense, for a split transformer with a large number of secondary windings, a change in the connection relationship between any one secondary winding and the corresponding load can be regarded as a change in the topology of the power supply network of the power supply system.
As mentioned above, each power supply subsystem is provided with a transformer, each transformer is correspondingly provided with a relay protector, and the relay protectors and the power supply subsystems are in one-to-one correspondence. The transformer protection method provided by the embodiment of the invention is applied to each relay protector in a power supply system, and when the transformer protection method is clarified, the 'belonging power supply subsystem' refers to the power supply subsystem corresponding to the relay to which the transformer protection method provided by the embodiment is applied, and the subsequent content is not repeatedly explained.
Based on the above, the following describes a method for acquiring topology information of a power supply network according to the present invention:
optionally, when the power supply system includes two or more power supply subsystems, and the transformer in each power supply subsystem is connected to the power supply network through the incoming line breaker, any power supply subsystem is disconnected from the power supply network, so that the change of the topology structure of the power supply network is caused, and the change can be represented by the real-time position information of the incoming line breaker. When any one or more power supply subsystems in the power supply system quit operation, the load power originally shared by the power supply subsystems quit operation naturally needs to be shared by the power supply subsystems still in a normal operation state in the power supply system, so that the power load born by the power supply subsystems in the normal operation state is increased, on the basis, for the relay protector of any power supply subsystem which does not quit operation in the power supply system, the relay protector cares about the operation conditions of other power supply subsystems except the power supply subsystem which belongs to the power supply system, and the change of the operation conditions can be visually represented by the real-time position information of the incoming line breaker which is used for connecting the transformer and the power supply network in the power supply subsystem, so that as an optional implementation mode, the real-time position information of the incoming line breaker of other power supply subsystems except the power supply subsystem in the power supply system can be obtained, namely, the real-time position information of the incoming line breaker is used as the topological structure information of the power supply system.
It is conceivable for any power supply subsystem to be characterized as being normally connected to the power supply network when the line breaker is in the closed state, and conversely to be characterized as being disconnected from the power supply network when the line breaker is in the open state.
Optionally, if the power supply system includes only one power supply subsystem, the topology of the power supply network described in this embodiment changes, and more specifically, the change of the connection relationship between the secondary winding of the transformer, especially the special multi-winding transformer, and the load. Therefore, in such an application scenario, the topology structure information of the power supply system is obtained, and specifically, the connection information between the transformer in the power supply subsystem and the outlet side load can be obtained. Of course, for the aforementioned power supply system including multiple power supply subsystems, on the basis of obtaining the real-time position information of the incoming line circuit breakers of other power supply subsystems in the power supply system and other power supply subsystems except the power supply subsystem, the connection information between the transformer in the power supply subsystem and the outgoing line side load may also be obtained at the same time.
Optionally, whether the power supply system specifically includes one power supply subsystem or includes a plurality of power supply subsystems, the topology information of the power supply system may also be provided by an upper control system of the power supply system. In practical applications, the upper-level control system described in this embodiment may have various options, for example, the upper-level control system may be a controller that is provided in a power supply system and is used for regulating and controlling the overall power supply condition of the power supply system; of course, the power supply system may be a control device or a control system that is responsible for a wider power supply schedule in a higher-level power transmission and distribution system, or the like. Of course, any upper-layer control system capable of providing the above topology information to each relay protector in the power supply system is optional, and the upper-layer control system also belongs to the protection scope of the present invention without exceeding the scope of the core idea of the present invention.
And S110, determining the current topological structure of the power supply system according to the topological structure information.
After the topological structure information of the power supply system is obtained, the current topological structure of the power supply system can be determined according to the obtained topological structure information.
The method comprises the following steps that the previous example is used, three power supply subsystems are arranged in a power supply system, and the three power supply subsystems are defined as a first topological structure when the three power supply subsystems normally run in a loading mode; and acquiring topological structure information to acquire that an incoming line breaker in another power supply subsystem in the power supply system is at a breaking position, and judging that the corresponding power supply subsystem is out of operation.
S120, determining a target protection current setting value corresponding to the current topological structure based on a preset corresponding relation between the topological structure of the power supply system and the protection current setting value.
As one of the keys for solving the foregoing technical problems, an embodiment of the present invention provides a preset corresponding relationship, where a corresponding relationship between a topology structure of a power supply system and a protection current setting value of a relay protector is recorded in the preset corresponding relationship, that is, a protection current setting value corresponding to a topology structure of any power supply system can be uniquely determined according to the preset corresponding relationship.
The following describes setting of the preset correspondence relationship based on a specific application scenario.
For a power supply system provided with only one special multi-winding transformer comprising a plurality of secondary windings, the fault of some secondary windings of the special multi-winding transformer does not necessarily cause the excessive current (relative to the commonly used overcurrent threshold value) of the outgoing line of the primary winding of the special multi-winding transformer.
Taking a special multi-winding transformer as an example, the impedance value that can be designed by a large number of secondary windings may be limited due to the phase shift requirement, the impedance value interval of some windings is small, and the impedance value may be large, thereby limiting the magnitude of the fault current of the primary winding, and the fault current of the primary winding may also be limited by the special multi-winding transformer structure of the plurality of secondary windings. Further, the cable impedance of the secondary winding also limits the magnitude of the primary side fault current to some extent.
The problem caused by this practical situation is that when some secondary windings of the special multi-winding transformer have faults, the fault current reflected on the primary winding is relatively small, and the relay protector general overcurrent protection method in the prior art cannot identify the faults, so that the special multi-winding transformer may be in a fault operation state for a long time.
In addition, for a power supply system comprising a plurality of power supply subsystems, such as a 2N-type redundant system, a multi-redundant system or a distributed redundant system, in most cases, each special multi-winding transformer in the system is in a low-load operation state, the secondary side current of the low-load operation special multi-winding transformer is very low, and the primary side current after the fault is also lower, and may even be lower than the rated current value of the primary winding.
For the practical application scenario, in the prior art, a relay protector adopts a protection method of a single setting current value (for example, 1.5-2 times of the rated current of the primary side of the special multi-winding transformer), the fault current of the primary side of the special multi-winding transformer is difficult to reach the setting current value set by the relay protector, and naturally, no method is available for effectively protecting the special multi-winding transformer.
Based on this, in the preset corresponding relationship provided in the embodiment of the present invention, a plurality of protection current setting values are set for the power supply system, and one protection current setting value corresponds to one topology structure of the power supply system. For example, for a dual-redundancy power supply system, when both power supply subsystems operate, a first topological structure is corresponding to, and a first protection current setting value corresponding to the first topological structure is correspondingly set; when one power supply subsystem operates, corresponding to the second topological structure, and correspondingly setting a second protection current setting value corresponding to the second topological structure.
More importantly, aiming at the condition that the primary side fault current is small, a plurality of protection current setting values can be set through the preset corresponding relation provided by the invention, and the protection current setting values are set to be small values, for example, the protection current setting values are set to be current values smaller than the rated current of the primary side winding of the special multi-winding transformer.
And providing a plurality of selectable protective current setting values through a preset corresponding relation, and flexibly adjusting the currently used protective current setting value in each relay protector when the power supply network topological structure of the power supply system changes, namely determining a target protective current setting value corresponding to the current topological structure of the power supply network according to the preset corresponding relation.
It should be noted that, the specific selection of each protection current setting value in the preset corresponding relationship can be flexibly set according to the actual protection requirement, the capacity of the special multi-winding transformer, the load condition and other information, and the specific value of each protection current setting value is not limited in the invention.
And S130, judging whether the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents the detected arc light, if so, executing S140.
The sensitivity of the relay protector can be effectively improved through the preset corresponding relation, particularly under the condition that each protection current setting value in the preset corresponding relation is set to be small, but another problem is generated at the same time, namely the influence of fluctuating current, if the current fluctuation occurs under the condition that the target protection current setting value is small, the relay protector is likely to malfunction and power supply is cut off wrongly. Although the sensitivity of the overcurrent protection is improved, the power supply stability is lowered.
In order to avoid the problem, in the protection method provided by the embodiment of the invention, an arc light detection signal is further introduced, and whether the transformer in the belonging power supply subsystem actually fails is judged through the arc light detection signal fed back by the arc light detector, that is, only when the current on the incoming line side of the transformer in the belonging power supply subsystem is greater than or equal to a target protection current setting value and the arc light detection signal represents that the arc light is detected, the subsequent step is executed, so that the connection between the transformer in the belonging power supply subsystem and the power supply network is disconnected, and the overcurrent protection of the transformer is realized.
Therefore, in the protection method provided by the invention, for any relay protector in the power supply system, the change of the power supply network topological structure of the power supply system only can directly influence the selection of the target protection current setting value, and can not directly cause whether the relay protector acts or not, the action of the relay protector is determined by the target protection current setting value and the arc light detection signal, and the error action of the relay protector can be effectively avoided by reflecting the arc light detection signal, so that the power supply stability is improved.
And S140, disconnecting the transformer in the power supply subsystem from the power supply network.
Based on the above, under the condition that the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light, the connection between the transformer in the power supply subsystem and the power supply network is disconnected.
Optionally, under the condition that the transformer is connected to the power supply network through the incoming line breaker, the relay protector sends a trip signal to the target incoming line breaker, and controls the target incoming line breaker to trip, so as to disconnect the corresponding transformer from the power supply network. The target incoming line breaker is an incoming line breaker which is connected between the incoming line side of a transformer in the power supply subsystem and the power supply network in series.
In summary, according to the transformer protection method provided by the present invention, any relay protector in the power supply system can adjust the adopted protection current setting value according to the change of the topology structure of the power supply system, that is, the actually adopted protection current setting value can be reduced under the condition of low load or load of each transformer, so as to improve the protection sensitivity, and at the same time, the method is assisted by combining arc light detection, so that protection can be performed only when the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents the detected arc light, and the power supply stability is considered, thereby effectively solving the problems of the transformer protection method in the prior art.
Optionally, referring to fig. 2, fig. 2 is another transformer protection method provided in an embodiment of the present invention, and on the basis of the embodiment shown in fig. 1, the transformer protection method provided in this embodiment further includes:
s200, obtaining a standard protection current setting value;
the standard protection current setting value provided by the embodiment of the invention is larger than any protection current setting value included in the preset corresponding relation, and more importantly, the standard protection current setting value is larger than or far larger than the primary side rated current of the transformer in the power supply subsystem under the normal condition.
Optionally, in practical application, the standard protection current setting value may be directly selected from a protection current setting value of 1.5-2 times of rated current set by a relay protector in the prior art, or may be selected from any other low value, but the selection at this time is actually a balance/trade-off between protection sensitivity and protection stability.
And S210, judging whether the current of the incoming line side of the transformer is greater than or equal to the standard protection current setting value, and if so, executing S140.
Under the condition that an arc light detection signal representing the detected arc light is not obtained, if the on-side current of the transformer in the power supply subsystem is greater than or equal to the standard protection current setting value, S140 can be directly executed, the connection between the transformer in the power supply subsystem and the power supply network is disconnected, and the protection of the transformer is realized.
In summary, the transformer protection method provided in this embodiment may be regarded as a combination of the transformer protection method provided in the embodiment shown in fig. 1 and a transformer protection method in the prior art, so that a larger protection current setting value set in the prior art is still usable, and meanwhile, a more effective protection measure may be further provided for the transformer.
It is conceivable that, in practical applications, the secondary winding of the transformer fails, but the failure current of the primary winding is not changed sufficiently, and most of the failure current of the primary winding occurs in a redundant power supply system provided with a plurality of special multi-winding transformers, so that the transformer protection method provided by each of the above embodiments of the present invention has a significant application effect on improving the power supply stability of the redundant power supply system provided with a plurality of special multi-winding transformers.
In the following, the transformer protection device provided by the embodiment of the present invention is introduced, and the transformer protection device described below may be regarded as a functional module architecture that needs to be set in the central device to implement the transformer protection method provided by the embodiment of the present invention; the following description may be cross-referenced with the above.
Optionally, referring to fig. 3, fig. 3 is a block diagram of a transformer protection device according to an embodiment of the present invention, where the transformer protection device includes:
the first obtaining unit 10 is configured to obtain topological structure information of the power supply system, incoming line side current of a transformer in the power supply subsystem to which the power supply system belongs, and an arc light detection signal of an arc light sensor in the power supply subsystem to which the power supply system belongs;
wherein the topology information characterizes a power supply network topology change of the power supply system;
a first determining unit 20, configured to determine a current topology of the power supply system according to the topology information;
a second determining unit 30, configured to determine, based on a preset correspondence between a topological structure of the power supply system and a protection current setting value, a target protection current setting value corresponding to the current topological structure;
and the first control unit 40 is used for disconnecting the transformer in the power supply subsystem from the power supply network if the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light.
Optionally, if the power supply system includes two or more power supply subsystems, and each transformer in the power supply system is connected to the power supply network through the incoming line breaker, the first obtaining unit 10 is configured to obtain topology structure information of the power supply system, and specifically includes:
and acquiring real-time position information of the incoming line circuit breakers of other power supply subsystems except the power supply subsystem in the power supply system.
Optionally, if the power supply system includes one power supply subsystem, the first obtaining unit 10 is configured to, when obtaining the topology information of the power supply system, specifically include:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
Optionally, the first obtaining unit 10 is configured to, when obtaining the topology structure information of the power supply system, further include:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
Optionally, the first obtaining unit 10 is configured to, when obtaining the topology structure information of the power supply system, specifically include:
and acquiring topological structure information of the power supply system provided by an upper control system.
Optionally, the first control unit 40, when disconnecting the transformer in the power supply subsystem from the power supply network, specifically includes:
sending a tripping signal to a target incoming line breaker to trip the target incoming line breaker;
the target incoming line breaker is an incoming line breaker which is connected between the incoming line side of a transformer in the power supply subsystem and a power supply network in series.
Optionally, referring to fig. 4, fig. 4 is a block diagram of another transformer protection device according to an embodiment of the present invention, and on the basis of the device shown in fig. 3, the device further includes:
a second obtaining unit 50, configured to obtain a standard protection current setting value;
the standard protection current setting value is larger than any one of the protection current setting values included in the preset corresponding relation and the primary side rated current of the transformer in the power supply subsystem;
and the second control unit 60 is configured to disconnect a transformer in the power supply subsystem from the power supply network if the incoming line side current is greater than or equal to the standard protection current setting value.
Optionally, an embodiment of the present invention further provides a relay protector, including: an actuator and a controller, wherein,
the control end of the execution mechanism is connected with the controller and executes preset actions according to control signals of the controller;
the controller comprises a memory and a processor; the memory stores a program suitable for the processor to execute, so as to implement the transformer protection method provided by any one of the above embodiments of the present invention.
Alternatively, referring to fig. 5 and 6, fig. 5 and 6 respectively show an alternative configuration of the power supply system (redundant power supply system) provided by the embodiment of the present invention. The power supply system provided by the embodiment of the invention comprises: at least one power supply subsystem comprising a transformer (shown in fig. 5 and 6 as a special multi-winding transformer), at least one arc sensor, an incoming line breaker, and a relay protector as provided in any of the above embodiments, wherein,
the inlet wire side of the transformer is connected with a power supply network through the inlet wire breaker;
each arc light sensor is arranged at a preset position on the outgoing line side of the transformer and used for carrying out arc light detection on each preset position;
the relay protector is in communication connection with each arc light detector in the power supply subsystem, the incoming line circuit breaker in the power supply subsystem and relay protectors in other power supply subsystems except the power supply subsystem.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A transformer protection method applied to a power supply system including at least one power supply subsystem including a transformer, at least one arc sensor for collecting arc light of the transformer, and a relay protector, the method being applied to any one of the relay protectors, the method comprising:
acquiring topological structure information of the power supply system, incoming line side current of a transformer in the power supply subsystem and arc light detection signals of an arc light sensor in the power supply subsystem;
wherein the topology information characterizes a power supply network topology change of the power supply system;
determining the current topological structure of the power supply system according to the topological structure information;
determining a target protection current setting value corresponding to the current topological structure based on a preset corresponding relation between the topological structure of the power supply system and the protection current setting value;
and if the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light, disconnecting the transformer in the power supply subsystem from the power supply network.
2. The transformer protection method of claim 1, further comprising:
acquiring a standard protection current setting value;
the standard protection current setting value is larger than any one of the protection current setting values included in the preset corresponding relation and the primary side rated current of the transformer in the power supply subsystem;
and if the current on the wire inlet side is greater than or equal to the standard protection current setting value, disconnecting the transformer in the power supply subsystem from the power supply network.
3. The transformer protection method according to claim 1, wherein if the power supply system includes two or more power supply subsystems and each transformer in the power supply system is connected to a power supply network through an incoming breaker, the obtaining the topology information of the power supply system includes:
and acquiring real-time position information of the incoming line circuit breakers of other power supply subsystems except the power supply subsystem in the power supply system.
4. The transformer protection method according to claim 1, wherein if the power supply system includes one of the power supply subsystems, the obtaining topology information of the power supply system includes:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
5. The transformer protection method according to claim 3, wherein the obtaining topology information of the power supply system further comprises:
and acquiring the connection information of a transformer and a load at the outgoing line side in the power supply subsystem.
6. The transformer protection method according to claim 1, wherein the obtaining topology information of the power supply system comprises:
and acquiring topological structure information of the power supply system provided by an upper control system.
7. The transformer protection method of claim 3, wherein disconnecting the transformer within the power supply subsystem from the power supply network comprises:
sending a tripping signal to a target incoming line breaker to trip the target incoming line breaker;
the target incoming line breaker is an incoming line breaker which is connected between the incoming line side of a transformer in the power supply subsystem and a power supply network in series.
8. A transformer protection device, comprising:
the first acquisition unit is used for acquiring topological structure information of the power supply system, incoming line side current of a transformer in the power supply subsystem and arc light detection signals of an arc light sensor in the power supply subsystem;
wherein the topology information characterizes a power supply network topology change of the power supply system;
the first determining unit is used for determining the current topological structure of the power supply system according to the topological structure information;
the second determining unit is used for determining a target protection current setting value corresponding to the current topological structure based on a preset corresponding relation between the topological structure of the power supply system and the protection current setting value;
and the first control unit is used for disconnecting the transformer in the power supply subsystem from the power supply network if the current on the incoming line side is greater than or equal to the target protection current setting value and the arc light detection signal represents and detects the arc light.
9. A relay protector, comprising: an actuator and a controller, wherein,
the control end of the execution mechanism is connected with the controller and executes preset actions according to control signals of the controller;
the controller comprises a memory and a processor; the memory stores a program adapted to be executed by the processor to implement the transformer protection method of any one of claims 1 to 7.
10. A power supply system, comprising: at least one power supply subsystem comprising a transformer, at least one arc sensor, an incoming line breaker, and the relay protector provided in claim 9, wherein,
the inlet wire side of the transformer is connected with a power supply network through the inlet wire breaker;
each arc light sensor is arranged at a preset position on the outgoing line side of the transformer and used for carrying out arc light detection on each preset position;
the relay protector is in communication connection with each arc light detector in the power supply subsystem, the incoming line circuit breaker in the power supply subsystem and relay protectors in other power supply subsystems except the power supply subsystem.
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| CN202011263269.0A CN112332370A (en) | 2020-11-12 | 2020-11-12 | Transformer protection method and device, relay protector and power supply system |
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| CN202011263269.0A CN112332370A (en) | 2020-11-12 | 2020-11-12 | Transformer protection method and device, relay protector and power supply system |
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