CN112485556A - CVT fault detection method and system based on transformer substation monitoring system and storage medium - Google Patents
CVT fault detection method and system based on transformer substation monitoring system and storage medium Download PDFInfo
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Abstract
The invention discloses a CVT fault detection method based on a transformer substation monitoring system, which comprises the following steps: acquiring real-time operation data of CVT equipment; judging whether the CVT equipment is abnormal or not based on the real-time operation data; and if the CVT equipment is abnormal, sending CVT warning information to the transformer substation monitoring system. A fault detection system and a storage medium are also disclosed. The fault detection method provided by the invention realizes online monitoring and real-time fault early warning of the CVT equipment, can discover various possible faults of the CVT as early as possible, avoids the faulty operation of the CVT equipment, adopts response measures in time to avoid equipment accidents, and ensures safe and stable operation of a transformer substation. Need not to increase professional fault diagnosis or data acquisition device in addition, investment cost is very little, and operation maintenance is also comparatively simple and convenient.
Description
Technical Field
The invention relates to a CVT fault detection method, a CVT fault detection system and a storage medium based on a transformer substation monitoring system, and belongs to the technical field of power system dispatching automation.
Background
Capacitor Voltage Transformers (CVTs) are widely applied to 35-750 kV power systems in our country, and the higher the Voltage level is, the higher the utilization rate of the CVT is. In a transformer substation (including booster stations of power plants, wind power plants, photovoltaic power stations and the like), a CVT is not only used on a line outlet in a large quantity, but also is often installed on a bus to replace an electromagnetic voltage transformer, and the CVT can be divided into two types according to different wiring modes: the CVT (three-phase CVT for short) in a three-phase wiring mode is used for equipment such as line voltage variation in a 500kV line, 220kV and below bus or line transformer wiring mode; a CVT (single-phase CVT) of a single-phase connection mode is used for equipment such as 500kV buses, 220kV and below lines, bypass buses and the like.
However, due to the restriction of factors such as process level and design and manufacturing experience, the components of the CVT of the substation are broken down, which not only affects the measurement accuracy of the CVT, but also is more likely to cause serious accidents such as explosion and fire, which may seriously affect the safe and stable operation of the power grid.
Therefore, a detection method suitable for the substation CVT fault needs to be designed to early warn the CVT fault in advance and reduce potential safety hazards caused by the CVT fault.
Disclosure of Invention
The invention aims to overcome the defect that potential safety hazards are easily caused when a CVT (continuously variable transmission) of a transformer substation breaks down in the prior art, and provides a CVT fault detection method based on a transformer substation monitoring system, which has the following technical scheme:
a CVT fault detection method based on a transformer substation monitoring system comprises the following steps:
acquiring real-time operation data of CVT equipment;
judging whether the CVT equipment is abnormal or not based on the real-time operation data;
and if the CVT equipment is abnormal, sending CVT warning information to the transformer substation monitoring system.
Further, according to claim 1, a CVT fault detection method based on substation monitoring systemIf the CVT equipment is a three-phase CVT, the real-time operation data comprises the voltage state of the three-phase CVT and the open delta voltage 3U0Phase U of A phase voltageaPhase U of B phase voltagebC phase voltage UcUpper limit value U of current phase voltageupLower limit value Ulow。
Preferably, if the A-phase voltage UaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has pressure, otherwise, the three-phase CVT has no pressure, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT has voltage, if the voltage is 3U, the three-phase CVT is open-delta voltage0Greater than the opening triangular voltage 3U0The setting value of (3) is USET2, the open-delta voltage of the three-phase CVT is 3U0Abnormal, sending open triangular voltage 3U to the monitoring system0Abnormal alarm information; otherwise, the three-phase CVT open delta voltage is 3U0And if the current running data is normal, updating the real-time running data of the three-phase CVT equipment.
Further, if the CVT device is a single-phase CVT, the real-time operation data includes a voltage state of the single-phase CVT and a voltage value U of the CVTlPhase voltage U of A phase of three-phase CVT (constant voltage transformer) with same name bus of single-phase CVTaAnd the upper limit value U of the current phase voltage of the three-phase CVT with the same name bus of the single-phase CVTupLower limit value Ulow。
Preferably, the CVT voltage value UlIf the ratio of the single-phase CVT to the rated voltage value is larger than the USET1, the single-phase CVT has voltage, otherwise, the single-phase CVT has no voltage, and the real-time operation data of the single-phase CVT equipment is updated;
calculating the voltage U of the single-phase CVT when the single-phase CVT has the voltage and the single-phase CVT is in the closed position with the bus interrupterlA-phase voltage U of three-phase CVT (continuously variable transmission) with same name bus of single-phase CVTaAbsolute difference value DeltaU betweenal；
To Ua、UlComparing to obtain UaAnd UlIs smaller value of Ualmin；
If Δ UalAnd UalminIs greater than the unbalance constant Kb2And if the voltage of the single-phase CVT equipment is not balanced, transmitting the U of the single-phase CVT to the monitoring systemlUnbalanced alarm signalAnd if not, the voltage of the single-phase CVT equipment is balanced, and the real-time operation data of the single-phase CVT equipment is updated.
CVT fault detection system based on transformer substation monitoring system comprises
A monitoring data acquisition module: the system comprises a monitoring system, a central processing unit (CVT) and a control unit, wherein the monitoring system is used for acquiring real-time operation data of the CVT collected by the monitoring system of the transformer substation;
the monitoring data abnormity judgment module: the CVT device is used for judging whether the CVT device is abnormal or not based on the real-time operation data;
the alarm information sending module: and the alarm information is sent to the transformer substation monitoring system.
A CVT fault detection system based on a transformer substation monitoring system comprises a storage medium and a processor;
storage medium: for storing instructions;
a processor: for operating in accordance with instructions to perform the steps of the aforementioned method.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the aforementioned method.
Compared with the prior art, the invention has the following beneficial effects:
the fault detection method provided by the invention realizes online monitoring and real-time fault early warning of the CVT equipment, can discover various possible faults of the CVT as soon as possible, such as partial capacitor damage or insulation abnormity and the like, avoids faulty operation of the CVT equipment, adopts countermeasures in time to avoid equipment accidents, and ensures safe and stable operation of a transformer substation. Need not to increase professional fault diagnosis or data acquisition device in addition, investment cost is very little, and operation maintenance is also comparatively simple and convenient.
Drawings
FIG. 1 is a flow chart of a CVT fault detection method of the present invention;
FIG. 2 is a schematic structural diagram of a CVT fault detection system based on a substation monitoring system according to the present invention;
FIG. 3 is an open delta voltage 3U for a three-phase CVT0A flow chart of a method of detecting an anomaly;
FIG. 4 is a flow chart of a method of detecting phase voltage amplitude imbalance of a three-phase CVT;
FIG. 5 is a flow chart of a method of detecting voltage imbalance in a single-phase CVT;
FIG. 6 is a flow chart of a method for detecting an out-of-limit phase voltage amplitude for a three-phase CVT;
FIG. 7 is a flow chart of a method for detecting voltage amplitude violations of a single-phase CVT.
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.
Interpretation of terms
CVT, English full name Capacitive Voltage Transformer, Chinese definition is a Capacitive Voltage Transformer.
Example 1
As shown in fig. 1, a CVT fault detection method based on a substation monitoring system includes the following steps:
acquiring real-time operation data of CVT equipment;
judging whether the CVT equipment is abnormal or not based on the real-time operation data;
if the CVT equipment is abnormal, CVT warning information is sent to a transformer substation monitoring system;
and if the CVT equipment has no abnormality, continuing to execute the steps. Specifically, after the fault detection in the period is finished, a new cycle of fault detection is started after a certain time (configurable, generally, several seconds or several tens of seconds) is waited.
In this embodiment, different types of CVT devices have different failure warning criteria, and if the three-phase CVT device detects the open-delta voltage 3U, the three-phase CVT device detects the open-delta voltage0Abnormal or phase voltage magnitude imbalance (i.e., U)a、Ub、UcA certain phase voltage unbalance exists in the three-phase voltage) or the amplitude of the phase voltage is out of limit (namely U)a、Ub、UcThree-phase voltage at least one phase voltage amplitude out of limit) and the like. And the single-phase CVT device detects the voltage unbalance or the voltage amplitude is largerAt least one of the two types of abnormity is a state abnormity.
In the embodiment, a corresponding data model is established for each CVT device of the transformer substation; the data stored in the data model includes: type of CVT device, rated voltage UeThe remote signaling and remote measuring data related to the real-time point number and the limit value of various voltages, the remote signaling point number of various alarms and the like. The real-time point numbers of the various voltages refer to specific real-time voltages such as Ua、UlRecording address of transformer substation monitoring system, through which U can be reada、UlEtc. current real-time data. The alarm remote signaling point signals are that the alarm signals of the CVT are used as the remote signaling of the transformer substation monitoring system: if the remote signaling is 0, the alarm-free state is achieved; if the remote signaling is 1, the remote signaling is in an alarm occurrence state correspondingly; if the remote signaling state is changed from 0 to 1, the alarm is generated; if the remote signaling state changes from 1 to 0, the alarm is removed.
As shown in fig. 2, the current real-time operation data of each CVT device collected by the substation monitoring system, including various voltages and relevant breaker states, is written into the data model of the CVT.
In this embodiment, specifically, if the CVT device is a three-phase CVT, the real-time operation data includes a voltage state of the three-phase CVT and an open-delta voltage 3U0Phase U of A phase voltageaPhase U of B phase voltagebC phase voltage UcUpper limit value U of current phase voltageupLower limit value Ulow。
As shown in fig. 3, in the present embodiment, the open delta voltage 3U is preferably detected0Judging whether the three-phase CVT has voltage or not, and if the voltage of the A-phase voltage U is abnormal, judging whether the three-phase CVT has voltage or notaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the three-phase CVT is greater than the USET1, the three-phase CVT has pressure;
otherwise, the three-phase CVT has no voltage, and real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT has voltage, if the voltage is 3U, the three-phase CVT is open-delta voltage0Greater than the opening triangular voltage 3U0The setting value of (3) is USET2, the open-delta voltage of the three-phase CVT is 3U0Abnormal, send opening three to the monitoring systemAngular voltage 3U0Abnormal alarm information, otherwise, three-phase CVT open delta voltage 3U0And if the current running data is normal, updating the real-time running data of the three-phase CVT equipment. In this embodiment, the voltage of the three-phase CVT with voltage and the rated voltage U are determinedeThe value of the ratio USET1 is 0.3. Open delta voltage 3U0The setting value of the USET2 is 1.5V.
As shown in fig. 4, in the present embodiment, it is preferable that the a-phase voltage U be the phase voltage UaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has pressure, otherwise, the three-phase CVT has no pressure, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT has voltage, the voltage U is based on the voltage U of the three-phase voltage AaPhase U of B phase voltagebC phase voltage UcAnd (3) calculating:
phase-to-phase voltage difference delta U between A phase and B phaseab，ΔUab＝|Ua-UbI, i.e. UaAnd UbTaking the absolute value of the difference;
phase-to-phase voltage difference delta U between phase B and phase Cbc，ΔUbc＝|Ub-UcI, i.e. UbAnd UcTaking the absolute value of the difference;
phase-to-phase voltage difference delta U between C phase and A phaseca，ΔUca＝|Uc-UaI, i.e. UcAnd UaTaking the absolute value of the difference;
phase voltage U of A phaseaVoltage U with phase BbThe smaller value between is Uabmin；
Phase U of B voltagebVoltage U with C phasecThe smaller value between is Ubcmin；
C phase voltage UcVoltage U with A phaseaThe smaller value between is Ucamin；
If it is
A, B the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if it is
B, C the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if it is
C, A the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if A, B two-phase voltage is unbalanced and C, A two-phase voltage is unbalanced, the A-phase voltage U is equal to the A-phase voltageaFor voltage unbalance phase, sending U to monitoring systemaUnbalanced alarm information;
if B, C two-phase voltage is unbalanced and A, B two-phase voltage is unbalanced, the B-phase voltage U is equal to the U-phase voltagebIs a voltage unbalance phase; sending U to monitoring systembUnbalanced alarm information;
if C, A two-phase voltage is unbalanced and B, C two-phase voltage is unbalanced, the C-phase voltage U is equal to the U-phase voltagecIs a voltage unbalance phase; sending U to monitoring systemcUnbalanced alarm information;
otherwise, the three-phase CVT has no voltage unbalance phase, and real-time operation data of the three-phase CVT equipment is updated. Three-phase voltage unbalance constant value K in the embodimentb1The value is 0.03.
As shown in fig. 6, in the present embodiment, it is preferable that the a-phase voltage U be the phase voltage UaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has voltage, otherwise, the three-phase CVT has no voltage, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT is stressed,
if U isa>UupOr Ua<UlowIf the A phase voltage of the three-phase CVT is out of limit, sending out A phase voltage out-of-limit alarm information to the monitoring system;
if U isb>UupOr Ub<UlowIf the B phase voltage of the three-phase CVT is out of limit, sending out B phase voltage out-of-limit alarm information to a monitoring system;
if U isc>UupOr Uc<UlowIf the C-phase voltage of the three-phase CVT is out of limit, sending out C-phase voltage out-of-limit alarm information to the monitoring system;
if U isa∈[Ulow,Uup]And U isb∈[Ulow,Uup]And U isc∈[Ulow,Uup]And updating real-time operation data of the three-phase CVT equipment and judging whether the voltage state of the three-phase CVT is in a voltage state again.
As shown in fig. 5, in this embodiment, specifically, if the CVT device is a single-phase CVT, the real-time operation data includes a voltage state of the single-phase CVT and a voltage value U of the CVTlPhase voltage U of A phase of three-phase CVT (constant voltage transformer) with same name bus of single-phase CVTaAnd the upper limit value U of the current phase voltage of the three-phase CVT with the same name bus of the single-phase CVTupLower limit value Ulow。
In the present embodiment, specifically, CVT voltage value UlIf the ratio of the single-phase CVT to the rated voltage value is larger than the USET1, the single-phase CVT has voltage, otherwise, the single-phase CVT has no voltage, and the real-time operation data of the single-phase CVT equipment is updated;
calculating the voltage U of the single-phase CVT when the single-phase CVT has the voltage and the single-phase CVT is in the closed position with the bus interrupterlA-phase voltage U of three-phase CVT (continuously variable transmission) with same name bus of single-phase CVTaAbsolute difference value DeltaU betweenal(ii) a In this embodiment, whether the bus interrupter is in the on-position state is remote signaling data obtained from the substation monitoring system.
To Ua、UlComparing to obtain UaAnd UlIs smaller value of Ualmin；
If Δ UalAnd UalminIs greater than the unbalance constant Kb2And if the voltage of the single-phase CVT equipment is not balanced, transmitting the U of the single-phase CVT to the monitoring systemlUnbalanced alarm information; otherwise, the voltage of the single-phase CVT equipment is balanced, and the real-time operation data of the single-phase CVT equipment is updated. In the present embodiment, the fixed value K of the unbalance of the single-phase voltageb2The value was 0.02.
As shown in fig. 7, in the present embodiment, specifically, the single-phase CVT voltage valueUlIf the ratio of the voltage to the rated voltage value is greater than the USET1, the single-phase CVT has voltage, otherwise, the single-phase CVT has no voltage, and the real-time operation data of the single-phase CVT equipment is updated;
when the single-phase CVT has the voltage and the single-phase CVT is in the on position with the bus interrupter, if the voltage value U of the single-phase CVT is equal to the voltage value U of the single-phase CVTlGreater than UupOr less than UlowIf the voltage of the single-phase CVT exceeds the limit, the U of the single-phase CVT is sent to the monitoring systemlVoltage out-of-limit warning information;
if single-phase CVT voltage value UI∈[Ulow,Uup]And if the voltage of the single-phase CVT is not out of limit, updating the real-time operation data of the single-phase CVT equipment.
CVT fault detection system based on transformer substation monitoring system comprises
A monitoring data acquisition module: the system comprises a monitoring system, a central processing unit (CVT) and a control unit, wherein the monitoring system is used for acquiring real-time operation data of the CVT collected by the monitoring system of the transformer substation; in this embodiment, including setting up a plurality of measurement and control devices (not shown in the figure) in the transformer substation, be connected with each CVT equipment for gather the real-time operating data (relevant telemetering measurement, telesignalling secondary voltage data) of each CVT equipment, a plurality of measurement and control devices and transformer substation monitoring system communication connection, transformer substation monitoring system obtains practice operating data and saves practice operating data in transformer substation monitoring system's real-time database.
The monitoring data abnormity judgment module: the CVT device is used for judging whether the CVT device is abnormal or not based on the real-time operation data; in this embodiment, the monitoring data abnormality determination module is a data model shown in fig. 2, the controller controls the data model to read the latest real-time operation data in the substation monitoring system, the controller executes the fault diagnosis step of the three-phase CVT device or the single CVT device in the foregoing method based on the latest real-time operation data, the controller performs a series of data processing, analysis and logical determination on the data, communicates with the substation monitoring system, acquires data from the substation monitoring system, determines whether a fault abnormality exists, and sends a determination result to the substation monitoring system. The data model is internally judged based on the methods listed in fig. 1, 3-7, described earlier. The data model of the controller periodically (second level) inspects all CVT equipment, and is fast and efficient.
The alarm information sending module: and the alarm information is sent to the transformer substation monitoring system. And the data model sends each analysis result and abnormal fault alarm information to the substation monitoring system. The transformer substation monitoring system further comprises a human-computer interface for displaying warning information, and the human-computer interface reminds workers (namely transformer substation managers) to pay attention to the warning information, so that equipment accidents are avoided, and online monitoring and real-time fault early warning of the CVT are achieved.
The transformer substation monitoring system has the functions of providing a data source and displaying an analysis result.
A CVT fault detection system based on a transformer substation monitoring system comprises a storage medium and a processor;
storage medium: for storing instructions;
a processor: for operating in accordance with instructions to perform the steps of the aforementioned method.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the aforementioned method.
The fault detection method provided by the invention realizes online monitoring and real-time fault early warning of the CVT equipment, can discover various possible faults of the CVT as soon as possible, such as partial capacitor damage or insulation abnormity and the like, avoids faulty operation of the CVT equipment, adopts countermeasures in time to avoid equipment accidents, and ensures safe and stable operation of a transformer substation. Need not to increase professional fault diagnosis or data acquisition device in addition, investment cost is very little, and operation maintenance is also comparatively simple and convenient.
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 (11)
1. A CVT fault detection method based on a transformer substation monitoring system is characterized by comprising the following steps:
acquiring real-time operation data of CVT equipment;
judging whether the CVT equipment is abnormal or not based on the real-time operation data;
and if the CVT equipment is abnormal, sending CVT warning information to the transformer substation monitoring system.
2. The CVT fault detection method based on the substation monitoring system according to claim 1, wherein if the CVT device is a three-phase CVT, the real-time operation data includes a voltage state of the three-phase CVT and an open delta voltage of 3U0Phase U of A phase voltageaPhase U of B phase voltagebC phase voltage UcUpper limit value U of current phase voltageupLower limit value Ulow。
3. The CVT fault detection method based on the substation monitoring system according to claim 2, characterized in that if the A-phase voltage is U-phase voltageaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has pressure, otherwise, the three-phase CVT has no pressure, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT has voltage, if the open delta voltage is 3U0Greater than the opening triangular voltage 3U0The setting value of (3) is USET2, the open delta voltage of the three-phase CVT is 3U0Abnormal, sending open triangular voltage 3U to the monitoring system0Abnormal alarm information;
otherwise, the three-phase CVT open delta voltage is 3U0And if the current running data is normal, updating the real-time running data of the three-phase CVT equipment.
4. The CVT fault detection method based on the substation monitoring system according to claim 2, characterized in that if the A-phase voltage is U-phase voltageaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has voltage, otherwise, the three-phase CVT has no voltage, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT is in voltage, based on the voltage stateThree-phase voltage A phase voltage UaPhase U of B phase voltagebC phase voltage UcAnd (3) calculating:
phase-to-phase voltage difference delta U between A phase and B phaseab，ΔUab＝|Ua-UbI, i.e. UaAnd UbTaking the absolute value of the difference;
phase-to-phase voltage difference delta U between phase B and phase Cbc，ΔUbc＝|Ub-UcI, i.e. UbAnd UcTaking the absolute value of the difference;
phase-to-phase voltage difference delta U between C phase and A phaseca，ΔUca＝|Uc-UaI, i.e. UcAnd UaTaking the absolute value of the difference;
phase voltage U of A phaseaVoltage U with phase BbThe smaller value between is Uabmin；
Phase U of B voltagebVoltage U with C phasecThe smaller value between is Ubcmin；
C phase voltage UcVoltage U with A phaseaThe smaller value between is Ucamin；
If it is
A, B the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if it is
B, C the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if it is
C, A the two-phase voltage is unbalanced, where Kb1Setting the unbalance of the three-phase voltage;
if A, B two-phase voltage is unbalanced and C, A two-phase voltage is unbalanced, the A-phase voltage U is equal to the A-phase voltageaFor voltage unbalance phases, sending U to the monitoring systemaUnbalance ofThe alarm information of (1);
if B, C two-phase voltage is unbalanced and A, B two-phase voltage is unbalanced, the B-phase voltage U is equal to the U-phase voltagebIs a voltage unbalance phase; sending U to the monitoring systembUnbalanced alarm information;
if C, A two-phase voltage is unbalanced and B, C two-phase voltage is unbalanced, the C-phase voltage U is equal to the U-phase voltagecIs a voltage unbalance phase; sending U to the monitoring systemcUnbalanced alarm information;
otherwise, the three-phase CVT has no voltage unbalance phase, and real-time operation data of the three-phase CVT equipment is updated.
5. The CVT fault detection method based on the substation monitoring system according to claim 2, characterized in that if the A-phase voltage is U-phase voltageaRated voltage U of phase voltage of A phaseeIf the ratio of the three-phase CVT to the USET1 is greater than the USET1, the three-phase CVT has voltage, otherwise, the three-phase CVT has no voltage, and the real-time operation data of the three-phase CVT equipment is updated;
when the voltage state of the three-phase CVT is stressed,
if U isa>UupOr Ua<UlowIf the A phase voltage of the three-phase CVT is out of limit, sending out A phase voltage out-of-limit alarm information to the monitoring system;
if U isb>UupOr Ub<UlowIf the B phase voltage of the three-phase CVT is out of limit, sending out B phase voltage out-of-limit alarm information to the monitoring system;
if U isc>UupOr Uc<UlowIf the C-phase voltage of the three-phase CVT is out of limit, sending out C-phase voltage out-of-limit alarm information to the monitoring system;
if U isa∈[Ulow,Uup]And U isb∈[Ulow,Uup]And U isc∈[Ulow,Uup]And updating real-time operation data of the three-phase CVT equipment, and judging whether the voltage state of the three-phase CVT is in voltage again.
6. The CVT fault detection method based on the substation monitoring system according to claim 1, wherein if the CVT device is a single-phase CVT, the real-time operation data includes a voltage state of the single-phase CVT and a voltage value U of the CVTlPhase voltage U of A phase of three-phase CVT (constant voltage transformer) with same name bus of single-phase CVTaAnd the upper limit value U of the current phase voltage of the three-phase CVT with the same name bus of the single-phase CVTupLower limit value Ulow。
7. The CVT fault detection method based on substation monitoring system according to claim 6, characterized in that the CVT voltage value U islTo rated voltage value UeIf the ratio of the voltage to the voltage of the single-phase CVT is larger than the USET1, the single-phase CVT has voltage, otherwise, the single-phase CVT has no voltage, and the real-time operation data of the single-phase CVT equipment is updated;
calculating the single-phase CVT voltage U when the single-phase CVT has a voltage and the single-phase CVT is in a closed position with a bus interrupterlphase-A voltage U of three-phase CVT with same-name bus of single-phase CVTaAbsolute difference value DeltaU betweenal；
To Ua、UlComparing to obtain UaAnd UlIs smaller value of Ualmin；
If Δ UalAnd UalminIs greater than the unbalance constant Kb2If the voltage of the single-phase CVT equipment is unbalanced, sending the U of the single-phase CVT to the monitoring systemlUnbalanced alarm information;
otherwise, the voltage of the single-phase CVT equipment is balanced, and the real-time operation data of the single-phase CVT equipment is updated.
8. The CVT fault detection method based on substation monitoring system according to claim 6, characterized in that the single-phase CVT voltage value UlTo rated voltage value UeIf the ratio of the voltage to the voltage of the single-phase CVT is larger than the USET1, the single-phase CVT has voltage, otherwise, the single-phase CVT has no voltage, and the real-time operation data of the single-phase CVT equipment is updated;
when the single-phase CVT has voltage and the single-phase CVT is arranged between the busWhen the circuit breaker is in the closed position, if the single-phase CVT voltage value U islGreater than UupOr less than UlowIf the voltage of the single-phase CVT exceeds the limit, the monitoring system sends the U of the single-phase CVTlVoltage out-of-limit warning information;
if the single-phase CVT voltage value UI∈[Ulow,Uup]And if the voltage of the single-phase CVT is not out of limit, updating the real-time operation data of the single-phase CVT equipment.
9. A CVT fault detection system based on a transformer substation monitoring system is characterized by comprising
A monitoring data acquisition module: the system comprises a monitoring system, a central processing unit (CVT) and a control unit, wherein the monitoring system is used for acquiring real-time operation data of the CVT collected by the monitoring system of the transformer substation;
the monitoring data abnormity judgment module: the CVT device is used for judging whether the CVT device is abnormal or not based on the real-time operation data;
the alarm information sending module: and the monitoring system is used for sending alarm information to the transformer substation monitoring system.
10. A CVT fault detection system based on a transformer substation monitoring system is characterized by comprising a storage medium and a processor;
the storage medium: for storing instructions;
the processor: for operating in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 7.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 7.
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