CN212031587U - Reactor running state on-line monitoring system in power capacitor complete equipment - Google Patents
Reactor running state on-line monitoring system in power capacitor complete equipment Download PDFInfo
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- CN212031587U CN212031587U CN201922329718.6U CN201922329718U CN212031587U CN 212031587 U CN212031587 U CN 212031587U CN 201922329718 U CN201922329718 U CN 201922329718U CN 212031587 U CN212031587 U CN 212031587U
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Abstract
The utility model relates to an on-line monitoring system for the running state of a reactor in a power capacitor complete device, belonging to the technical field of on-line monitoring of transformer substation equipment; the system comprises a voltage acquisition module, a current acquisition module, a signal processing module and a logic analysis module, wherein the input end of the voltage acquisition module is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete device and the secondary side of a discharge coil of the power capacitor; the defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Description
Technical Field
The utility model relates to a reactor running state on-line monitoring system among power capacitor integrated equipment belongs to substation equipment on-line monitoring technical field.
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 power capacitor complete sets are most economical in quantity, and 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 reactor with a certain reactance rate is often input into a power capacitor complete set, wherein a dry type hollow series reactor (hereinafter referred to as a reactor) is widely applied to a power capacitor complete set due to the advantages of good linearity, small loss, low noise, high mechanical strength, convenience in maintenance and the like.
Due to reasons such as design, manufacture, operation, maintenance and use environment, the reactor often has certain faults, wherein turn-to-turn short circuit faults account for the first of all fault types. When the reactor has turn-to-turn short circuit fault, the short circuit turns form a closed loop under the action of electromagnetic induction, and after the closed loop is coupled with other normal coils, a large short circuit current can be generated in the short circuit turns. The temperature of the coil near the short-circuit position will rise sharply under the effect of the short-circuit current, which accelerates the aging of the insulating material near the short-circuit turn, and then expands to multi-turn short-circuit fault. The vicious circle enables the short-circuit fault to be continuously developed, and finally, the accident that the reactor is burnt out due to fire can be caused.
The power factor angle of the reactor is an important index for marking the basic performance and the state of the reactor, can reflect the quality of manufacturing process and raw materials and the state and the level of safe operation, and is particularly important for monitoring the operation state of the reactor. In the prior art, when the reactor is tested, the power-off measurement is needed, and because the reactor is not in a working state after the power-off, the obtained result cannot reflect the running state of the reactor, the reliability of the obtained measurement result is poor, and the hidden danger of the fault is greatly increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the on-line monitoring system for the running state of the reactor in the power capacitor complete device is provided, the defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Reactor running state on-line monitoring system among power capacitor integrated equipment, including voltage acquisition module, current acquisition module, signal processing module, logic analysis module, power capacitor integrated equipment transformer substation's generating line's voltage transformer's secondary side and power capacitor discharge coil's secondary side are connected to voltage acquisition module input, and power capacitor integrated equipment outlet switch cabinet's current transformer's secondary side is connected to current acquisition module, and current acquisition module and voltage acquisition module's output links to each other with signal processing module's input, and signal processing module's output links to each other with logic analysis module's input.
The method comprises the steps that firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil are obtained through a voltage acquisition module at the secondary side of a bus voltage transformer of a transformer substation where a power capacitor complete device is located, meanwhile, a current signal I of the secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device is obtained through a current acquisition module, a signal processing module processes parameters acquired by the current acquisition module and the voltage acquisition module and sends the parameters into a logic analysis module, and the logic analysis module further operates current signals and voltage signals sent by the voltage acquisition module and the current acquisition module. And the logic analysis module calculates the change rate of the power factor angle, judges the running state of the reactor according to the change rate of the power factor angle of the reactor, and sends out an alarm signal or sends out a tripping command to a breaker in a switch cabinet if the change rate of the power factor angle is more than 10 percent, otherwise, the power capacitor complete device continues to run without other operations.
Preferably, the device further comprises an audible and visual alarm module, and the output end of the logic analysis module is connected with the audible and visual alarm module.
Preferably, the voltage acquisition module is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a substation where the power capacitor complete set is located and a secondary side voltage signal Uc of a power capacitor discharge coil, and the current acquisition module is used for acquiring a current signal I in an operation loop of the power capacitor complete set.
Preferably, the voltage acquisition module comprises a first voltage acquisition unit and a second voltage acquisition unit, the input end of the first voltage acquisition unit is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete device, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete device is located; the input end of the second voltage acquisition unit is connected with the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
Preferably, the logic analysis module comprises an operating voltage calculation unit, a phase calculation unit for a voltage signal, a phase calculation unit for a current signal, a power factor angle calculation unit, the input end of the operation voltage calculation unit is connected with the output end of the signal processing module, the output end of the operation voltage calculation unit is connected with the input end of the phase calculation unit of the voltage signal, the output end of the phase calculation unit of the voltage signal is connected with the input end of the power factor angle calculation unit, the input end of the phase calculation unit of the current signal is connected with the output end of the signal processing module, the output end of the phase calculation unit of the current signal is connected with the input end of the power factor angle calculation unit, the output end of the power factor angle calculation unit is connected with the input end of the power factor angle change rate calculation unit, the output end of the power factor angle change.
Compared with the prior art, the utility model discloses following beneficial effect has:
reactor running state on-line monitoring system among power capacitor integrated equipment under the condition that does not increase reactor terminal voltage transformer, realizes the real-time supervision to reactor power factor angle, through its situation of change of comparison, can master the actual insulating state of reactor, whether have turn-to-turn short circuit etc. send the warning immediately when the reactor breaks down, remind fortune dimension personnel carry out subsequent inspection or change to the reactor state. The defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Compared with the existing detection system, the reactor is in normal operation, the conventional measurement method needs to measure the reactor in the power failure state of the power capacitor complete device, 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 system is used for measuring the power capacitor complete equipment under the actual operation condition, the operation state of the power capacitor complete equipment can be truly reflected, the power factor angle of the three-phase reactor can be monitored on line, the reliability and the comparability of the measurement result are higher, and the defects of the equipment which cannot be discovered under low voltage can be discovered. If the power factor angle change rate is obviously increased, an alarm signal is sent immediately or a tripping command is sent to a circuit breaker in a switch cabinet of the power factor angle change rate, the device is quitted from running, and accidents of the power capacitor complete device are prevented. The defect of poor reliability in the power interruption detection in the prior art is overcome, and the working safety of the dry-type hollow series reactor and the power capacitor complete device is greatly improved.
Drawings
FIG. 1 is a structural diagram of an online monitoring system for the running state of a reactor in a power capacitor complete plant of the present invention;
FIG. 2 is the utility model discloses reactor running state on-line monitoring system work flow chart among power capacitor integrated equipment.
Wherein: 1. a voltage acquisition module; 101. a first voltage acquisition unit; 102. a second voltage acquisition unit; 2. a current collection module; 3. a signal processing module; 4. a logic analysis module; 401. an operating voltage calculation unit; 402. a phase calculation unit of the voltage signal; 403. a phase calculation unit of the current signal; 404. a power factor angle calculation unit; 405. a power factor angle change rate calculation unit; 406. a comparison unit; 5. and a sound and light alarm module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, reactor running state on-line monitoring system among power capacitor integrated equipment, including voltage acquisition module 1, current acquisition module 2, signal processing module 3, logic analysis module 4, power capacitor integrated equipment transformer substation's generating line's secondary side and power capacitor discharge coil's secondary side are connected to voltage acquisition module 1 input, power capacitor integrated equipment outlet switch cabinet's current transformer's secondary side is connected to current acquisition module 2, current acquisition module 2 and voltage acquisition module 1's output link to each other with signal processing module 3's input, signal processing module 3's output links to each other with logic analysis module 4's input.
Firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil are obtained through a voltage acquisition module 1, and meanwhile, a current signal I of a secondary side of a current transformer of a power capacitor complete equipment outgoing line switch cabinet is obtained through a current acquisition module 2, a signal processing module 3 processes parameters acquired by the current acquisition module 2 and the voltage acquisition module 1 and sends the parameters into a logic analysis module 4, and the logic analysis module 4 further operates current signals and voltage signals sent by the voltage acquisition module 1 and the current acquisition module 2. The logic analysis module 4 calculates the power factor angle change rate and judges the running state of the reactor according to the power factor angle change rate of the reactor, if the power factor angle change rate is larger than 10%, an alarm signal is sent out, or a tripping command is sent out to a breaker in a switch cabinet of the power factor angle change rate, otherwise, other operations are not executed, and the power capacitor complete device continues to run.
Wherein, reactor running state on-line monitoring system among power capacitor integrated equipment still includes audible-visual annunciator module 5, and audible-visual annunciator module 5 is connected to logic analysis module 4's output
The voltage acquisition module 1 is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a transformer substation where the power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil, and the current acquisition module 2 is used for acquiring a current signal I in an operation loop of the power capacitor complete device.
The voltage acquisition module 1 comprises a first voltage acquisition unit 101 and a second voltage acquisition unit 102, wherein the input end of the first voltage acquisition unit 101 is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete device, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete device is located; the input end of the second voltage acquisition unit 102 is connected to the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
Wherein, the logic analysis module 4 comprises an operation voltage calculation unit 401, a voltage signal phase calculation unit 402, a current signal phase calculation unit 403, a power factor angle calculation unit 404, a power factor angle change rate calculation unit 405, and a comparison unit 406, wherein the input end of the operation voltage calculation unit 401 is connected with the output end of the signal processing module 3, the output end is connected with the input end of the voltage signal phase calculation unit 402, the output end of the voltage signal phase calculation unit 402 is connected with the input end of the power factor angle calculation unit 404, the input end of the current signal phase calculation unit 403 is connected with the output end of the signal processing module 3, the output end is connected with the input end of the power factor angle calculation unit 404, the output end of the power factor angle calculation unit 404 is connected with the input end of the power factor angle change rate calculation unit 405, the output end of the power, the output end of the comparison unit 406 is connected with the sound and light alarm module 5.
Here, the signal processing module 3 processes the parameters acquired by the current acquisition module 2 and sends the parameters to the phase calculation unit 403 of the current signal, and the signal processing module 3 processes the parameters acquired by the voltage acquisition module 1 and sends the parameters to the operating voltage calculation unit 401.
The working process and the working principle are as follows:
when the on-line monitoring system for the running state of the reactor in the power capacitor complete device is used for monitoring the working state of the reactor, firstly, a voltage signal U and a secondary side voltage Uc of a power capacitor discharge coil of a transformer substation bus voltage transformer where the power capacitor complete device is located are obtained through a voltage acquisition module 1, meanwhile, a current signal I of a secondary side of a power capacitor complete device outgoing line switch cabinet current transformer is obtained through a current acquisition module 2, a signal processing module 3 processes parameters acquired by the current acquisition module 2 and the voltage acquisition module 1 and sends the parameters into a logic analysis module 4, and the logic analysis module 4 further operates current signals and voltage signals sent by the voltage acquisition module 1 and the current acquisition module 2.
In the logic analysis module 4, a voltage calculation unit 401 calculates a phase calculation unit 402 of an input voltage signal of an operating voltage U1 of the reactor according to Ul-Uc-U; the phase calculation unit 402 of the voltage signal calculates the voltage phase phi U1 of the reactor, and the phase calculation unit 403 of the current signal calculates the current phase phi I of the reactor; the power factor angle calculation unit 404 calculates a power factor angle Φ of the reactor from Φ ═ Φ U1- Φ I; the power factor angle change rate calculation unit 405 obtains a power factor angle change rate by comparing the power factor angle phi with a rated value of the reactor power factor angle; the comparison unit 406 judges the operation state of the reactor according to the change rate of the power factor angle of the reactor, and if the change rate of the power factor angle is greater than 10%, the acousto-optic alarm module 5 is driven to perform acousto-optic alarm, otherwise, other operations are not executed, and the power capacitor complete device continues to operate.
As shown in FIG. 2, the working method of the reactor operation state on-line monitoring system in the power capacitor complete device of the present invention comprises the following steps:
step S1, start;
step S2, acquiring data: obtaining a phase phi U1 of a voltage signal of the reactor and a phase phi I of a current signal of a secondary side of a current transformer of the power capacitor complete equipment outlet switch cabinet;
step S3, calculating a power factor angle change rate: calculating the change rate of the power factor angle of the reactor and the rated value of the power factor angle of the reactor according to the acquired data;
step S4, determining the operating state: and judging the running state of the dry type hollow series reactor in the power capacitor complete device according to the power factor angle change rate.
Wherein, step S4 includes:
step S401, if the power factor angle change rate is larger than 10%, the working state of the reactor is in an abnormal state, step S402 is executed, otherwise step S403 is executed;
step S402, alarming;
in step S403, the power capacitor plant continues to operate.
Here, the alarm in step S402 may be an alarm signal and/or a trip command to a circuit breaker in a switch cabinet thereof, and the trip command is issued to exit the device.
Wherein, step S2 includes:
step S201, obtaining a secondary side voltage signal U of a bus voltage transformer of a transformer substation where a power capacitor complete device is located and a secondary side voltage signal Uc of a power capacitor discharge coil;
step S202, calculating the operating voltage U1 of the reactor according to the Ul-Uc-U;
step S203, calculating the phase phi U1 of the reactor operation voltage signal;
step S204, obtaining a current signal I of a secondary side of a current transformer of an outgoing line switch cabinet of the power capacitor complete device;
and S205, calculating the phase phi I of the secondary side current signal of the outgoing line switch cabinet current transformer of the power capacitor complete device.
Wherein, step S3 includes:
step S301, calculating a power factor angle phi of the reactor according to the phi is equal to phi U1-phi I;
and step S302, obtaining the power factor angle change rate by the ratio of the power factor angle phi to the rated value of the reactor power factor angle.
Wherein, the alarm mode in step S402 is an audible and visual alarm.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited thereto, and all the equivalent modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a reactor running state on-line monitoring system among power capacitor integrated equipment, a serial communication port, including voltage acquisition module (1), current acquisition module (2), signal processing module (3), logic analysis module (4), power capacitor integrated equipment transformer substation bus's voltage transformer's secondary side and power capacitor discharge coil's secondary side are connected to voltage acquisition module (1) input, power capacitor integrated equipment outlet switch cabinet's current transformer's secondary side is connected in current acquisition module (2), the output of current acquisition module (2) and voltage acquisition module (1) links to each other with the input of signal processing module (3), the output of signal processing module (3) links to each other with the input of logic analysis module (4).
2. The system for monitoring the running state of the reactor in the power capacitor complete set device in the claim 1, characterized by further comprising an audible and visual alarm module (5), wherein the output end of the logic analysis module (4) is connected with the audible and visual alarm module (5).
3. The system for monitoring the running state of the reactor in the power capacitor complete equipment according to the claim 1 or 2, characterized in that the voltage acquisition module (1) is used for acquiring a secondary side voltage signal U of a bus voltage transformer of a transformer substation where the power capacitor complete equipment is located and a secondary side voltage signal Uc of a discharge coil of the power capacitor, and the current acquisition module (2) is used for acquiring a current signal I in a running loop of the power capacitor complete equipment.
4. The system for monitoring the running state of the reactor in the power capacitor complete equipment according to claim 3, wherein the voltage acquisition module (1) comprises a first voltage acquisition unit (101) and a second voltage acquisition unit (102), the input end of the first voltage acquisition unit (101) is connected with the secondary side of a voltage transformer of a substation bus of the power capacitor complete equipment, and the acquisition module is used for acquiring a secondary side voltage signal U of the voltage transformer of the substation bus where the power capacitor complete equipment is located; the input end of the second voltage acquisition unit (102) is connected with the secondary side of the power capacitor discharge coil and is used for acquiring a secondary side voltage signal Uc of the power capacitor discharge coil.
5. The system for online monitoring of the running state of the reactor in the power capacitor complete set device according to claim 4, characterized in that the logic analysis module (4) comprises a running voltage calculation unit (401), a phase calculation unit (402) of a voltage signal, a phase calculation unit (403) of a current signal, a power factor angle calculation unit (404), a power factor angle change rate calculation unit (405) and a comparison unit (406), wherein the input end of the running voltage calculation unit (401) is connected with the output end of the signal processing module (3), the output end of the running voltage calculation unit (401) is connected with the input end of the phase calculation unit (402) of the voltage signal, the output end of the phase calculation unit (402) of the voltage signal is connected with the input end of the power factor angle calculation unit (404), the input end of the phase calculation unit (403) of the current signal is connected with the output end of the signal processing module (, the output end of the power factor angle calculation unit (404) is connected with the input end of the power factor angle change rate calculation unit (405), the output end of the power factor angle change rate calculation unit (405) is connected with the input end of the comparison unit (406), and the output end of the comparison unit (406) is connected with the acousto-optic alarm module (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112666415A (en) * | 2020-12-18 | 2021-04-16 | 安徽链众电气科技有限公司 | Power capacitor on-line monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112666415A (en) * | 2020-12-18 | 2021-04-16 | 安徽链众电气科技有限公司 | Power capacitor on-line monitoring device |
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