CN112327076A - Method for diagnosing running state of series dry type reactor based on tan delta difference - Google Patents
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- G—PHYSICS
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
A method for diagnosing the running state of a series dry-type reactor based on a tan delta difference value belongs to the technical field of online monitoring of transformer substation equipment. The method is characterized in that: the method comprises the following steps: step a to step c: obtaining a secondary side voltage signal of a power capacitor discharge coil, a current signal of a secondary side of an outgoing line switch cabinet and a capacitance value; d, judging whether the working state of the capacitor is in an abnormal state or not; e, audible and visual alarm and a tripping instruction are sent out; f-h, obtaining a bus voltage value of the transformer substation, the running voltage of the series dry type reactor and a tan delta value; step i, judging whether the working state of the series dry-type reactor is in an abnormal state; and j, sound and light alarm. And step k, continuously operating the series dry-type reactor. By the method for diagnosing the running state of the series dry type reactor based on the tan delta difference, the running state of the reactor is monitored on line, and the working safety of the reactor and a power capacitor is greatly improved.
Description
Technical Field
A method for diagnosing the running state of a series dry-type reactor based on a tan delta difference value belongs to the technical field of online monitoring of transformer substation equipment.
Background
With the increase of inductive load of the power system, the reactive power demand of the system is higher and higher. In reactive power compensation devices in China, the most power capacitors are the most economical, and the reactive power compensation devices play a good role in the aspects of safe and stable operation of a power system, improvement of electric energy quality, reduction of network loss, improvement of power transmission and distribution capacity and the like.
In order to suppress the amplification of higher harmonics of a power grid caused by the input of a power capacitor and limit the switching-on inrush current of the capacitor, a series connection dry-type reactor with a certain reactance rate is often input into the power capacitor, wherein a dry type hollow series connection dry-type reactor (hereinafter referred to as a series connection dry-type reactor) is widely applied to the power capacitor due to the advantages of good linearity, small loss, low noise, high mechanical strength, convenience in maintenance and the like.
Due to the reasons of design, manufacture, operation, maintenance, use environment and the like, a certain fault often occurs to the series dry type electric reactor, the voltage of the series dry type electric reactor can reflect the safe operation state and level of the series dry type electric reactor, in the prior art, the series dry type electric reactor needs to be subjected to power-off measurement when being tested, and the series dry type electric reactor is not in a working state after being subjected to power-off, so that the obtained measurement result cannot reflect the operation state of the series dry type electric reactor, the reliability of the obtained measurement result is poor, and the hidden danger of the fault is greatly increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, realizes online monitoring of the running state of the reactor, overcomes the defect of poor reliability in the prior art when the electric detection is interrupted, and greatly improves the working safety of the reactor and the power capacitor.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for diagnosing the running state of the series dry type reactor based on the tan delta difference comprises a running state diagnosis system, and is characterized in that: the method comprises the following steps:
step a, measuring a secondary side voltage signal of a power capacitor discharge coil through an operation state diagnosis system;
b, measuring by using an operation state diagnosis system to obtain a current signal of a secondary side of a current transformer of the power capacitor outgoing line switch cabinet;
step c, calculating the capacitance value of the power capacitor through the operation state diagnosis system;
d, judging whether the working state of the capacitor is in an abnormal state or not by the running state diagnosis system, executing the step e if the working state of the capacitor is in the abnormal state, and executing the step f if the working state of the capacitor is not in the abnormal state;
e, the running state diagnosis system performs audible and visual alarm on the power capacitor and sends a tripping command, and then the operation is finished;
step f, the running state diagnosis system measures to obtain a bus voltage value of the transformer substation;
step g, the running state diagnosis system calculates to obtain the running voltage of the series dry-type reactor;
step h, the running state diagnosis system calculates to obtain the tan delta value of the series dry-type reactor;
step i, the running state diagnosis system judges whether the working state of the series dry type reactor is in an abnormal state, if the working state of the series dry type reactor is in the abnormal state, step j is executed, and if the working state of the series dry type reactor is not in the abnormal state, step k is executed;
j, performing sound-light alarm on the series dry-type reactor by the running state diagnosis system, and then ending;
and step k, continuously operating the series dry-type reactor.
Preferably, the operation state diagnosis system includes: the device comprises a current acquisition module, a voltage acquisition module, a signal processing module, a logic analysis module and an audible and visual alarm module. The output ends of the current acquisition module and the voltage acquisition module are simultaneously connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the logic analysis module, and the output end of the logic analysis module is connected with the sound-light alarm module.
Preferably, the current acquisition module is connected with the secondary side of a current transformer of the power capacitor outgoing line switch cabinet; the voltage acquisition unit is connected with the secondary side of a voltage transformer arranged on a bus of the power capacitor transformer substation and the secondary side of a discharge coil of the power capacitor.
Preferably, in the step d, the criterion for determining whether the working state of the capacitor is in the abnormal state is as follows: and whether the deviation of the capacitance value of the capacitor from the rated value is more than 10%, and if the deviation of the capacitance value C of the capacitor from the rated value is more than 10%, the working state of the capacitor is in an abnormal state.
Preferably, in the step i, the criterion for determining whether the operating state of the series dry type reactor is in an abnormal state is as follows: and whether the deviation of the tan delta value of the series dry type reactor from the rated value is larger than 10% or not, and if the deviation of the tan delta value of the series dry type reactor from the rated value is larger than 10%, the series dry type reactor is in an abnormal state.
Preferably, in step c, the capacitance value of the power capacitor is calculated by the following formula:
wherein, UcIs the secondary side voltage signal of the discharge coil of the power capacitor, and I is the current signal of the power capacitor.
Preferably, in the step h, the calculation formula of the series dry-type reactor tan δ value is as follows:
wherein, U1And I is a current signal of the power capacitor for the operation voltage of the series dry type reactor.
Compared with the prior art, the invention has the beneficial effects that:
by the method for diagnosing the running state of the series dry type reactor based on the tan delta difference, the running state of the reactor is monitored on line, the defect of poor reliability in the prior art when the power is interrupted for detection is overcome, and the working safety of the reactor and a power capacitor is greatly improved.
Compared with the existing detection method, the operation state diagnosis method of the series dry-type reactor based on the tan delta difference has the advantages that the reactor is in normal operation, the conventional measurement method needs to measure the reactor in the power failure state of the power capacitor, the applied measurement voltage is generally low, no load current passes through a reactor loop, no heating phenomenon exists, and the actual operation state of the reactor is difficult to reflect. The device and the method are used for measuring the power capacitor under the actual operation condition, the operation state of the power capacitor can be truly reflected, the tan delta value of the three-phase reactor can be monitored on line, the reliability and the comparability of the measurement result are higher, and some equipment defects which cannot be found under low voltage can be found. If the tan delta value exceeds the specified value of the regulation, or the change rate is obviously increased, an alarm signal is immediately sent, or a tripping instruction is sent to a breaker in a switch cabinet of the switch cabinet, the device is quitted from running, and the accident of the power capacitor is prevented.
By setting the parameter measuring unit, the real-time monitoring of the tan delta value of the reactor is realized under the condition that the voltage transformer at the end of the reactor is not increased, the actual insulation state of the reactor, whether turn-to-turn short circuit exists or not and the like can be mastered by comparing the change conditions of the tan delta value and the delta value, an alarm is immediately sent when the reactor breaks down, and operation and maintenance personnel are reminded to perform subsequent inspection or replacement on the state of the reactor.
Drawings
Fig. 1 is a flowchart of a method for diagnosing an operating state of a series dry type reactor based on a tan δ difference.
Fig. 2 is a schematic block diagram of a system for diagnosing an operating state of a series dry type reactor based on a tan δ difference.
Detailed Description
FIGS. 1-2 illustrate preferred embodiments of the present invention, and the present invention will be further described with reference to FIGS. 1-2.
As shown in fig. 1, a method for diagnosing an operation state of a series dry type reactor based on a tan δ difference includes the steps of:
starting a method for diagnosing the running state of the series dry type reactor based on the tan delta difference;
In the series dry reactor operating condition diagnosing method based on the tan δ difference, an operating condition diagnosing system that measures and processes an operating parameter of a power capacitor is provided. As shown in fig. 2, the operation state diagnosis system includes: the device comprises a current acquisition module, a voltage acquisition module, a signal processing module, a logic analysis module and an audible and visual alarm module. The output ends of the current acquisition module and the voltage acquisition module are simultaneously connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the logic analysis module, and the output end of the logic analysis module is connected with the sound-light alarm module.
The voltage acquisition module is connected with the secondary side of a voltage transformer of a power capacitor substation bus and the secondary side of a power capacitor discharge coil and is respectively used for acquiring a voltage signal of the secondary side of the voltage transformer of the substation bus and a voltage signal of the secondary side of the power capacitor discharge coil; the current acquisition unit is connected with the secondary side of a current transformer of the power capacitor outgoing line switch cabinet and used for acquiring current signals in a power capacitor operation loop. The signal processing module is used for processing the parameters acquired by the current acquisition module and the voltage acquisition module and sending the parameters to the logic analysis module, the logic analysis module further operates the current signals and the voltage signals sent by the voltage acquisition module and the current acquisition module, and if an alarm needs to be given, the logic analysis module drives the sound-light alarm module to give a sound-light alarm. The logic analysis module can be realized by a common singlechip and a common PLC in the field.
In the step, a secondary side voltage signal U of the discharge coil of the power capacitor is obtained through a voltage acquisition unitc。
and obtaining a current signal I of the secondary side of the current transformer of the power capacitor outgoing line switch cabinet through the current acquisition module.
the logic analysis module calculates the capacitance value C of the power capacitor according to the following formula:
wherein, UcI is the secondary side voltage signal of the power capacitor discharge coil obtained in step 1002, and I is the current signal of the power capacitor obtained in step 1003.
the logic analysis unit judges whether the working state of the capacitor is in an abnormal state according to the following judgment criteria: whether the deviation of the capacitance value C of the capacitor from the rated value is larger than 10%, if the deviation of the capacitance value C of the capacitor from the rated value is larger than 10%, the working state of the capacitor is in an abnormal state, step 1006 is executed, and if the deviation of the capacitance value C of the capacitor from the rated value is not in the abnormal state, step 1007 is executed;
and the logic analysis module performs sound-light alarm on the power capacitor through the sound-light alarm module and sends a tripping instruction, and then finishes executing the method for diagnosing the running state of the series dry type reactor based on the tan delta difference.
and obtaining a bus voltage value U of the transformer substation through the voltage acquisition module.
The logic analysis module calculates and obtains the operation voltage U of the series dry type reactor in the power capacitor complete equipment according to the following formula1：
U1＝Uc-U formula (2)
Wherein, UcAnd U is the voltage signal U of the substation bus, which is the voltage signal of the secondary side of the power capacitor discharge coil obtained in step 1002.
the logic analysis module calculates the tan delta value of the series dry type reactor in the power capacitor complete equipment according to the following formula (3), wherein the tan delta value is the dielectric loss factor of the power capacitor,
wherein, U1I is the current signal of the power capacitor obtained in step 1003 for the series dry reactor operating voltage calculated in step 1008. Re denotes the real part of the complex number and Im denotes the imaginary part of the complex number.
the logic analysis unit judges whether the working state of the series dry-type reactor is in an abnormal state or not according to the following judgment basis: and (4) judging whether the deviation of the tan delta value of the series dry type reactor and the rated value is more than 10%, if so, judging that the working state of the series dry type reactor is in an abnormal state, executing step 1011, and if not, executing step 1012.
the logic analysis unit drives the acousto-optic alarm module to carry out acousto-optic alarm on the series dry type electric reactor, and then the execution of the method for diagnosing the running state of the series dry type electric reactor based on the tan delta difference is finished;
and the series dry-type reactor is in a normal working state, the logic analysis unit does not execute other operations, and the power capacitor continues to operate.
The working process and the working principle are as follows:
when the operating state of the series dry type reactor is monitored by using the tan delta difference-based operating state diagnosis method for the series dry type reactor, firstly, a voltage acquisition module in a parameter acquisition unit acquires a secondary side acquisition voltage signal U of a transformer substation bus voltage transformer where a power capacitor is located and a secondary side voltage U of a discharge coil of the power capacitorcMeanwhile, a current signal I of a secondary side of a current transformer of the power capacitor outgoing line switch cabinet is obtained through the current acquisition module, parameters acquired by the current acquisition module and the voltage acquisition module are processed and sent to the logic analysis module through the signal processing module in the parameter acquisition unit, and the current signal and the voltage signal sent by the voltage acquisition module and the current acquisition module are further operated through the logic analysis module.
The logic analysis module firstly calculates the capacitance value C of the capacitor, compares the capacitance value C with a rated value and judges whether the capacitor is in an abnormal state, if the deviation between the capacitance value C of the capacitor and the rated value is more than 10%, the working state of the capacitor is in the abnormal state, and at the moment, the logic analysis module drives the acousto-optic alarm module to carry out acousto-optic alarm on the power capacitor and send out a tripping command.
If the power capacitor is not in an abnormal state, the logic analysis module obtains a bus voltage value U of the transformer substation according to the voltage acquisition module, and then the logic analysis module calculates to obtain the operating voltage U of the series dry-type reactor in the power capacitor complete equipmentlAnd tan delta value for the series dry reactor. And finally, the logic analysis module calculates and obtains a tan delta value of the series dry-type electric reactor to be compared with a rated value, if the deviation between the tan delta value of the series dry-type electric reactor and the rated value is larger than 10%, the series dry-type electric reactor is in an abnormal operation state, the logic analysis unit drives the acousto-optic alarm module to carry out acousto-optic alarm on the series dry-type electric reactor, when the series dry-type electric reactor is not in the abnormal state, the series dry-type electric reactor is in a normal working state, the logic analysis unit does not execute other operations, and the power capacitor continues to operate.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (7)
1. A method for diagnosing the running state of a series dry type reactor based on a tan delta difference value comprises a running state diagnosis system, and is characterized in that: the method comprises the following steps:
step a, measuring a secondary side voltage signal of a power capacitor discharge coil through an operation state diagnosis system;
b, measuring by using an operation state diagnosis system to obtain a current signal of a secondary side of a current transformer of the power capacitor outgoing line switch cabinet;
step c, calculating the capacitance value of the power capacitor through the operation state diagnosis system;
d, judging whether the working state of the capacitor is in an abnormal state or not by the running state diagnosis system, executing the step e if the working state of the capacitor is in the abnormal state, and executing the step f if the working state of the capacitor is not in the abnormal state;
e, the running state diagnosis system performs audible and visual alarm on the power capacitor and sends a tripping command, and then the operation is finished;
step f, the running state diagnosis system measures to obtain a bus voltage value of the transformer substation;
step g, the running state diagnosis system calculates to obtain the running voltage of the series dry-type reactor;
step h, the running state diagnosis system calculates to obtain the tan delta value of the series dry-type reactor;
step i, the running state diagnosis system judges whether the working state of the series dry type reactor is in an abnormal state, if the working state of the series dry type reactor is in the abnormal state, step j is executed, and if the working state of the series dry type reactor is not in the abnormal state, step k is executed;
j, performing sound-light alarm on the series dry-type reactor by the running state diagnosis system, and then ending;
and step k, continuously operating the series dry-type reactor.
2. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 1, characterized in that: the operating condition diagnosing system includes: the device comprises a current acquisition module, a voltage acquisition module, a signal processing module, a logic analysis module and an audible and visual alarm module. The output ends of the current acquisition module and the voltage acquisition module are simultaneously connected with the input end of the signal processing module, the output end of the signal processing module is connected with the input end of the logic analysis module, and the output end of the logic analysis module is connected with the sound-light alarm module.
3. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 2, characterized in that: the current acquisition module is connected with the secondary side of a current transformer of the power capacitor outgoing line switch cabinet; the voltage acquisition unit is connected with the secondary side of a voltage transformer arranged on a bus of the power capacitor transformer substation and the secondary side of a discharge coil of the power capacitor.
4. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 1, characterized in that: in the step d, the judgment basis of whether the working state of the capacitor is in the abnormal state is as follows: and whether the deviation of the capacitance value of the capacitor from the rated value is more than 10%, and if the deviation of the capacitance value C of the capacitor from the rated value is more than 10%, the working state of the capacitor is in an abnormal state.
5. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 1, characterized in that: in the step i, the criterion for judging whether the working state of the series dry-type reactor is in an abnormal state is as follows: and whether the deviation of the tan delta value of the series dry type reactor from the rated value is larger than 10% or not, and if the deviation of the tan delta value of the series dry type reactor from the rated value is larger than 10%, the series dry type reactor is in an abnormal state.
6. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 1, characterized in that: in step c, the capacitance value of the power capacitor is calculated by the following formula:
wherein, UcIs the secondary side voltage signal of the discharge coil of the power capacitor, and I is the current signal of the power capacitor.
7. The method for diagnosing an operating state of a series dry reactor based on a tan δ difference according to claim 1, characterized in that: in the step h, the calculation formula of the tan δ value of the series dry-type reactor is as follows:
wherein, U1And I is a current signal of the power capacitor for the operation voltage of the series dry type reactor.
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Application publication date: 20210205 |