CN107834512B - Power SF6 main transformer non-electric quantity protection device and protection method - Google Patents
Power SF6 main transformer non-electric quantity protection device and protection method Download PDFInfo
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- CN107834512B CN107834512B CN201711307430.8A CN201711307430A CN107834512B CN 107834512 B CN107834512 B CN 107834512B CN 201711307430 A CN201711307430 A CN 201711307430A CN 107834512 B CN107834512 B CN 107834512B
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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
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/045—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a thermal radiation sensor
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- Protection Of Transformers (AREA)
Abstract
The application relates to an electric SF 6 A main transformer non-electric quantity protection device and a protection method. Including SF 6 Main transformer body, high voltage circuit breaker, thermal imaging temperature sensing unit, microprocessor, DA converter, AD converter, image display, SF 6 Main transformer body includes main transformer winding, iron core and SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 A gas; the high-voltage circuit breaker is arranged on SF 6 The primary high-voltage electric side of the main transformer body comprises a moving contact, a fixed contact and a tripping coil loop of a circuit breaker, and the high-voltage circuit breaker is separated by the insertion contact and separation of the moving contact and the fixed contact to realize the connection or disconnection of SF 6 A primary power supply of the main transformer body; the thermal imaging temperature sensing unit comprises a sensor arranged on SF 6 Sensor outside main transformer body and extending into SF 6 Main transformer body and installed in SF 6 A plurality of infrared thermal imaging temperature sensing probes and optical fibers on the inner wall of the main transformer body. The application protects the safety of staff and the main transformer and the safe operation of a large power grid.
Description
Technical Field
The application relates to an electric SF 6 A main transformer non-electric quantity protection device and a protection method.
Background
In the conventional main transformer operation, the electric quantity is mostly measured and protected by the change of the electric quantity and the magnetic quantity, and when the main transformer is operated by presetting an electric and magnetic protection setting value programWhen the electric quantity is up to a preset setting value, the electric quantity protection plays a role in protecting the main transformer, preventing the accident from expanding and protecting the safety of personnel and equipment, and the traditional main transformer also uses a temperature measuring probe to charge transformer oil or SF (sulfur hexafluoride) in the main transformer 6 The gas is measured to estimate the real temperature of the main transformer winding, and a non-electric quantity auxiliary protection mode is performed. The above is the protection mode of the existing main transformer electric quantity and non-electric quantity, and the defects and disadvantages of the protection mode are as follows:
traditional electric quantity protection mode: the electric quantity changes such as current, voltage, impedance, capacitive reactance, inductive reactance and the like have electric quantity change ranges in normal operation or abnormal operation, but the defects such as poor contact, loose joint or oxidization and the like which cause heating are detected by measuring contact resistance and the like after power failure, which cannot be measured in electrified operation, and the main transformer in electrified operation is often difficult to detect the heating defects in the traditional electric quantity protection mode.
Traditional non-electricity protection mode: because the main transformer has high voltage in operation, the traditional main transformer temperature measuring probe cannot be directly contacted with the main transformer winding to measure, and only the temperature measuring probe can be used for filling transformer oil or SF (sulfur hexafluoride) into the main transformer 6 The gas is measured to estimate the true temperature of the main transformer winding, which has serious hysteresis and inaccuracy.
Disclosure of Invention
The application aims to provide an electric SF 6 The main transformer non-electric quantity protection device and the protection method protect the safety of workers and the main transformer and the safety operation of a large power grid.
In order to achieve the above purpose, the technical scheme of the application is as follows: electric SF 6 Main transformer non-electric quantity protection device comprising SF 6 Main transformer body, high voltage circuit breaker, thermal imaging temperature sensing unit, microprocessor, DA converter, AD converter, image display, SF 6 Main transformer body includes main transformer winding, iron core and SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 A gas; the high-voltage circuit breaker is installedAt SF 6 The primary high-voltage electric side of the main transformer body comprises a moving contact, a fixed contact and a tripping coil loop of a circuit breaker, and the high-voltage circuit breaker is separated by the insertion contact and separation of the moving contact and the fixed contact to realize the connection or disconnection of SF 6 A primary power supply of the main transformer body; the thermal imaging temperature sensing unit comprises a sensor arranged on SF 6 Sensor outside main transformer body and extending into SF 6 Main transformer body and installed in SF 6 A plurality of infrared thermal imaging temperature sensing probes and optical fibers on the inner wall of the main transformer body; the infrared thermal imaging temperature sensing probe can carry out non-contact thermal imaging temperature measurement on the main transformer winding, and transmits temperature measurement signals to the sensor and an image display arranged in a remote control room through optical fibers, the sensor amplifies the thermal imaging temperature signals and then transmits the amplified thermal imaging temperature signals to the AD converter, the AD converter converts the transmitted thermal imaging temperature measurement electric signals into digital signals and then transmits the digital signals to the microprocessor, the microprocessor processes the digital signals and then transmits the digital signals to the DA converter, and the DA converter can convert the digital signals transmitted by the microprocessor into electric signals matched with a tripping loop of the circuit breaker and transmits the electric signals to the tripping loop of the circuit breaker to execute instructions sent by the microprocessor; the image display can observe SF at any time 6 The main transformer is internally provided with heating thermal imaging conditions so as to facilitate the observation of operators at any time.
In one embodiment of the application, the microprocessor can be based on SF 6 When serious heating defect endangering safe operation occurs to main transformer winding of main transformer body, SF is automatically controlled 6 The main transformer body acts on the tripping coil of the incoming side circuit breaker to cut off the incoming power supply, thereby avoiding SF 6 The main transformer body is further damaged, even the danger of burning explosion is avoided, and serious accidents of power grid accident expansion are also prevented; the microprocessor is preset with a tripping temperature protection setting value and is also preset with a device for penetrating SF according to infrared rays 6 Program for correcting different reflectivity and attenuation between gas and penetrating air, and program for correcting and compensating tripping temperature under different main transformer operating loads and different environment temperatures so as to achieve SF (sulfur hexafluoride) 6 Accurate temperature sensing of the main transformer winding of the main transformer body ensures accurate action, and avoids the condition that the heating degree is not reachedEndangering SF 6 False tripping operation during main transformer body is more completely eradicated when SF is endangered 6 When the main transformer body and the power grid safely run, the severe heating defect is overcome, the tripping accident of the circuit breaker cannot be controlled rapidly, and the safety of workers and power grid equipment is guaranteed powerfully.
The application also provides a power SF based on the power SF 6 The protection method of the main transformer non-electric quantity protection device comprises the following steps,
1）SF 6 the internal winding of the main transformer body heats up due to the action of current and magnetic field in electrified operation, and SF needs to be filled through the internal winding 6 The gas is cooled to ensure the operation safety;
2) According to SF 6 The running condition of main transformer body is that the programmed tripping temperature protection setting value is set in the microprocessor in advance, and the microprocessor should also penetrate SF according to the infrared ray 6 Programming procedure for correcting for different reflectivities and attenuations between gaseous medium and penetrating air medium, and for different SF 6 The main transformer is used for running load and correcting and compensating programming programs for tripping temperature under different environment temperatures;
3) At SF 6 Before the main transformer body is put into operation, the electric power SF is started 6 A main transformer non-electric quantity protection device;
4) Infrared thermal imaging temperature sensing probe pair SF 6 Performing online continuous infrared scanning temperature sensing on the effective range of a main transformer winding in the main transformer body;
5）SF 6 the main transformer body normally operates, the winding temperature value of the main transformer body does not exceed a preset tripping temperature protection setting value, and the microprocessor does not send out instructions;
6) When SF is 6 When the temperature of the main transformer winding in the main transformer body reaches a preset tripping temperature protection setting value, the microprocessor sends a tripping instruction signal to control the tripping coil of the circuit breaker to act, so that the moving contact of the circuit breaker is quickly separated from the fixed contact, and the SF is cut off 6 SF (sulfur hexafluoride) for serious heating fault of incoming side power supply of main transformer body 6 The main transformer body is forcedly isolated from the power grid, so that not only can the working personnel and the main transformer be protectedSafety and safe operation of a large power grid can be protected.
Compared with the prior art, the application has the following beneficial effects: the application is based on SF 6 The principle that no matter what kind of faults occur in the main transformer internal winding, the temperature rise temperature is higher than that in the normal running condition at the fault point of the main transformer internal winding, the accurate SF6 main transformer winding fault point temperature change condition can be captured on line and timely through the non-contact infrared sensing temperature of non-electric quantity, and the infrared sensing temperature probe keeps a non-contact safety distance with the winding and the iron core part with high-voltage electricity in the main transformer due to the SF of infrared rays 6 The gas medium has good penetration rate and small attenuation, so that the continuous and accurate temperature sensing work can be completed by transmitting and receiving infrared temperature sensing signals through the infrared temperature sensing probe, meanwhile, the application is provided with a tripping temperature protection setting value in advance, and the designed microprocessor is also programmed with a function of penetrating SF according to infrared rays 6 Procedure for correcting different reflectivity and attenuation between gas and penetrating air, and procedure for correcting and compensating tripping temperature under different main transformer operation loads and different environmental temperatures, etc., when SF is implemented 6 When the internal heating temperature of the main transformer exceeds the tripping protection setting value, the microprocessor gives out instructions to automatically control SF 6 The main transformer incoming side high-voltage circuit breaker is tripped by the action of the opening coil, and the incoming side power supply is cut off, so that the safety of the power grid personnel and equipment is powerfully ensured.
Drawings
FIG. 1 is a power SF of an embodiment of the present application 6 And the working principle diagram of the normal operation of the non-electric quantity protection device for heating the internal winding of the main transformer.
FIG. 2 is a power SF of an embodiment of the present application 6 When serious heating faults occur in the internal windings of the main transformer, the non-electric quantity protection device accurately cuts off the power supply of the circuit breaker at the incoming side, and a protection working principle diagram is carried out.
FIG. 3 is an SF of an embodiment of the present application 6 The internal heating fault temperature of the main transformer does not reach the protection setting value, the microprocessor does not execute instructions, DJ1 is not closed, and the trip coil loop wiring diagram is formed when the trip coil does not act.
FIG. 4 is an SF of an embodiment of the present application 6 The main transformer has serious heating fault, the temperature exceeds the protection setting value, the microprocessor sends out executing command, DJ1 is closed, and the tripping coil is in tripping action.
FIG. 5 is a power SF of an embodiment of the present application 6 A principle block diagram of a secondary protection loop of a main transformer non-electric quantity protection device.
In the figure: 1-an infrared thermal imaging temperature sensing probe; 2-optical fiber; a 3-AD converter; 4-an image display; 5-a microprocessor; a 6-DA converter; 7-SF 6 A main transformer body; 8-main transformer sleeve; 9-main transformer windings; 10-high voltage incoming line; 11-high voltage outgoing line; 12-main transformer incoming side circuit breaker; 13-a breaker static contact; 14-a breaker moving contact; 15-high voltage bushing lead; 16-breaker trip coil; 17-SF 6 And (3) gas.
Detailed Description
The technical scheme of the application is specifically described below with reference to fig. 1 to 5.
The application relates to an electric SF 6 Main transformer non-electric quantity protection device comprising SF 6 Main transformer body, high voltage circuit breaker, thermal imaging temperature sensing unit, microprocessor, DA converter, AD converter, image display, SF 6 Main transformer body includes main transformer winding, iron core and SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 A gas; the high-voltage circuit breaker is arranged on SF 6 The primary high-voltage electric side of the main transformer body comprises a moving contact, a fixed contact and a tripping coil loop of a circuit breaker, and the high-voltage circuit breaker is separated by the insertion contact and separation of the moving contact and the fixed contact to realize the connection or disconnection of SF 6 A primary power supply of the main transformer body; the thermal imaging temperature sensing unit comprises a sensor arranged on SF 6 Sensor outside main transformer body and extending into SF 6 Main transformer body and installed in SF 6 A plurality of infrared thermal imaging temperature sensing probes and optical fibers on the inner wall of the main transformer body; the infrared thermal imaging temperature sensing probe can carry out non-contact thermal imaging temperature measurement on the main transformer winding, and transmits temperature measurement signals to the sensor and the image display arranged in the remote control room through optical fibers, the sensor amplifies the thermal imaging temperature signals and then transmits the amplified thermal imaging temperature signals to the AD converter, and the AD converter transmits the thermal imaging temperature signalsAfter being converted into digital signals, the digital signals are transmitted to a microprocessor, the digital signals are processed by the microprocessor and then transmitted to a DA converter, the DA converter can convert the digital signals transmitted by the microprocessor into electric signals matched with a tripping loop of the circuit breaker and transmit the electric signals to the tripping loop of the circuit breaker, and the instruction sent by the microprocessor is executed; the image display can observe SF at any time 6 The main transformer is internally provided with heating thermal imaging conditions so as to facilitate the observation of operators at any time. The microprocessor can be based on SF 6 When serious heating defect endangering safe operation occurs to main transformer winding of main transformer body, SF is automatically controlled 6 The main transformer body acts on the tripping coil of the incoming side circuit breaker to cut off the incoming power supply, thereby avoiding SF 6 The main transformer body is further damaged, even the danger of burning explosion is avoided, and serious accidents of power grid accident expansion are also prevented; the microprocessor is preset with a tripping temperature protection setting value and is also preset with a device for penetrating SF according to infrared rays 6 Program for correcting different reflectivity and attenuation between gas and penetrating air, and program for correcting and compensating tripping temperature under different main transformer operating loads and different environment temperatures so as to achieve SF (sulfur hexafluoride) 6 Accurate temperature sensing of the main transformer winding of the main transformer body ensures accurate action, and avoids the damage of SF caused by the fact that the heating degree is not reached 6 False tripping operation during main transformer body is more completely eradicated when SF is endangered 6 When the main transformer body and the power grid safely run, the severe heating defect is overcome, the tripping accident of the circuit breaker cannot be controlled rapidly, and the safety of workers and power grid equipment is guaranteed powerfully.
The application also provides a power SF based on the power SF 6 The protection method of the main transformer non-electric quantity protection device comprises the following steps,
1）SF 6 the internal winding of the main transformer body heats up due to the action of current and magnetic field in electrified operation, and SF needs to be filled through the internal winding 6 The gas is cooled to ensure the operation safety;
2) According to SF 6 The running condition of main transformer body is that the programmed tripping temperature protection setting value is set in the microprocessor in advance, and the microprocessor is located at the positionThe processor should also penetrate SF according to infrared ray 6 Programming procedure for correcting for different reflectivities and attenuations between gaseous medium and penetrating air medium, and for different SF 6 The main transformer is used for running load and correcting and compensating programming programs for tripping temperature under different environment temperatures;
4) At SF 6 Before the main transformer body is put into operation, the electric power SF is started 6 A main transformer non-electric quantity protection device;
4) Infrared thermal imaging temperature sensing probe pair SF 6 Performing online continuous infrared scanning temperature sensing on the effective range of a main transformer winding in the main transformer body;
5）SF 6 the main transformer body normally operates, the winding temperature value of the main transformer body does not exceed a preset tripping temperature protection setting value, and the microprocessor does not send out instructions;
6) When SF is 6 When the temperature of the main transformer winding in the main transformer body reaches a preset tripping temperature protection setting value, the microprocessor sends a tripping instruction signal to control the tripping coil of the circuit breaker to act, so that the moving contact of the circuit breaker is quickly separated from the fixed contact, and the SF is cut off 6 SF (sulfur hexafluoride) for serious heating fault of incoming side power supply of main transformer body 6 The main transformer body is forcedly isolated from the power grid, so that the safety of workers and the main transformer can be protected, and the safe operation of a large power grid can be protected.
The following are specific examples of the present application.
Electric SF 6 Main transformer non-electric quantity protection device includes: SF (sulfur hexafluoride) 6 Main transformer body, high-voltage circuit breaker and SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 Gas, SF 6 The winding and the iron core in the main transformer body also comprise a thermal imaging temperature sensing system, a microprocessor, a real-time image display and the like which are arranged at the background of the remote control room. SF (sulfur hexafluoride) 6 The windings in the main transformer generate heat due to the action of current and magnetic field, the larger the current is, the stronger the magnetic flux is, the more serious the heat is, when overload and overvoltage occur, or the contact of internal parts is poor, abnormal heat defect can be generated, when serious overheat defect occurs, if the breaker cannot be rapidly opened, the power supply is cut off, the SF is seriously damaged 6 Main transformer and even cause the risk of burning and explosion, SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 The gas serves the insulating and cooling functions. Because high voltage exists in the main transformer, a temperature measurement probe which is generally in direct contact is difficult to directly contact with a winding and an iron core for temperature measurement, and the traditional main transformer winding and the iron core temperature measurement can only be used for indirectly measuring the temperature, such as the oil temperature and SF (sulfur hexafluoride) of the filling in the main transformer body 6 The temperature of the winding is estimated by the gas temperature, which has serious hysteresis and inaccuracy, and the infrared thermal imaging temperature sensing probe keeps a certain safety distance with the winding and the iron core part with high voltage in the main transformer, and the on-line accurate thermal imaging temperature measurement can be completed by non-contact infrared thermal imaging temperature sensing, and the infrared energy is in SF 6 The gas medium has good penetration rate and small attenuation, but the main transformer is not used for filling oil, the infrared ray has poor penetration rate and large attenuation in the liquid medium of the transformer oil in the main transformer, so the application applies the infrared temperature non-electric quantity protection mode and can only be suitable for filling SF 6 The main transformer of the gaseous medium is not applicable to the main transformer of the oil-filled medium.
High-voltage circuit breaker, high-voltage circuit breaker installs at SF 6 The primary high-voltage electric side of the main transformer comprises a moving contact, a fixed contact and a tripping coil, and the high-voltage circuit breaker is separated by the insertion contact and the separation of the moving contact and the fixed contact to realize the connection or disconnection of SF 6 The primary power supply of the main transformer, the high-voltage circuit breaker can be opened according to the normal operation procedure, and the SF is seriously endangered 6 When the main transformer has a heating fault, the microprocessor controls the tripping coil to act, so that the moving contact and the fixed contact which are switched on originally are separated quickly, the circuit breaker trips, the power supply is cut off, and the SF with serious heating defect can occur 6 The main transformer is isolated outside the electrified power grid, so that further expansion of accidents is prevented.
Thermal imaging temperature sensing system, thermal imaging temperature sensing system is including installing at SF 6 The sensor outside the main transformer body, a plurality of small-sized infrared thermal imaging temperature sensing probes which extend into the main transformer body and are arranged on the inner wall of the main transformer body, optical fibers for transmitting signals, an AD signal converter, a DA signal converter, a real-time image display and the like. Small infrared thermal imagingThe temperature sensing probe can be used for SF 6 The method comprises the steps that non-contact accurate thermal imaging temperature measurement is carried out on windings in a main transformer, on-line temperature measurement signals are transmitted to a sensor arranged outside the main transformer body and a real-time image display arranged in a remote control room through optical fibers, the sensor amplifies the thermal imaging temperature signals and then transmits the thermal imaging temperature signals to an AD signal converter, the AD signal converter converts the transmitted thermal imaging temperature measurement electric signals into digital signals and then transmits the digital signals to a microprocessor, the microprocessor transmits the digital signals after programming to a DA signal converter, the DA signal converter can convert the digital signals transmitted by the microprocessor into electric signals matched with a tripping circuit of a circuit breaker and transmit the electric signals to the tripping circuit of the circuit breaker, and instructions sent by the microprocessor are executed. The real-time image display installed in the remote control room can observe the internal heating thermal imaging condition of the SF6 main transformer at any time, so that operators can observe at any time. The output end of the small infrared temperature sensing probe is electrically connected with the input end of the sensor and the input end of the real-time image display, the output end of the sensor is electrically connected with the input end of the AD converter, the output end of the AD converter is electrically connected with the input end of the microprocessor, the output end of the microprocessor is electrically connected with the input end of the DA converter, and the output end of the DA converter is electrically connected with the tripping circuit of the high-voltage circuit breaker.
The microprocessor can automatically control the tripping coil of the SF6 main transformer electric side circuit breaker to act according to the serious heating defect of the SF6 main transformer winding, cut off the electric power supply, avoid the further damage of the SF6 main transformer, even the danger of burning explosion, and prevent the serious accident of the expansion of the electric network accident. The microprocessor is preset with a tripping temperature protection setting value, and is also programmed with a value for penetrating SF according to infrared rays 6 Program for correcting different reflectivity and attenuation between gas and penetrating air, program for correcting and compensating tripping temperature under different main transformer running loads and different environment temperatures, and the like, so as to achieve SF (sulfur hexafluoride) 6 Accurate temperature sensing of the main transformer winding ensures accurate action, avoids false tripping action when the heating degree does not reach the risk of SF6 main transformer, and more avoids serious heating which endangers SF6 main transformer and safe operation of a power gridIn case of defects, the severe accident of tripping of the circuit breaker cannot be controlled rapidly, and the safety of workers and power grid equipment is guaranteed powerfully.
The control method of the device is as follows:
1）SF 6 the main transformer 7 generates heat due to current and magnetic field in electrified operation, and SF is charged through its internal winding 9 6 The gas 17 is cooled to ensure operation safety;
2) According to SF 6 The running condition of the main transformer 7 is that a programmed tripping temperature protection setting value is set in the microprocessor 5 in advance, and the microprocessor also needs to penetrate SF according to infrared rays 6 Programming to correct for differential reflectivity and attenuation between gaseous 17 medium and penetrating air medium, and for different SF 6 The main transformer 7 runs load, corrects and compensates programming programs for tripping temperature under different environment temperatures, and the like;
3) At SF 6 Before the main transformer 17 is put into operation, the power SF is started 6 A main transformer non-electric quantity protection device;
4) SF pair of small-sized infrared thermal imaging temperature sensing probe 1 6 Performing online continuous infrared scanning temperature sensing on the effective range of the internal winding 9 of the main transformer 7;
5）SF 6 the main transformer 7 operates normally, the temperature value of the winding 9 does not exceed the preset tripping temperature protection setting value, and the microprocessor 5 does not send out instructions;
6) When SF is 6 When the temperature of the internal winding 9 of the main transformer 7 reaches a preset trip temperature protection setting value, the microprocessor 5 sends a trip instruction signal to control the trip coil 16 of the breaker 12 to act, so that the moving contact 14 of the breaker is rapidly separated from the fixed contact 13, and the SF is cut off 6 SF of the serious heating fault is generated by the power supply of the main transformer 7 on the incoming side 6 The main transformer 7 is forcedly isolated from the power grid, so that the safety of workers and the main transformer is protected, and the safe operation of a large power grid is also protected.
The above is a preferred embodiment of the present application, and all changes made according to the technical solution of the present application belong to the protection scope of the present application when the generated functional effects do not exceed the scope of the technical solution of the present application.
Claims (1)
1. Electric SF 6 The protection method of the main transformer non-electric quantity protection device is characterized by comprising the following steps of: the electric power SF 6 Main transformer non-electric quantity protection device comprising SF 6 Main transformer body, high voltage circuit breaker, thermal imaging temperature sensing unit, microprocessor, DA converter, AD converter, image display, SF 6 Main transformer body includes main transformer winding, iron core and SF 6 SF (sulfur hexafluoride) filled in main transformer body 6 A gas; the high-voltage circuit breaker is arranged on SF 6 The primary high-voltage electric side of the main transformer body comprises a moving contact, a fixed contact and a tripping coil loop of a circuit breaker, and the high-voltage circuit breaker is separated by the insertion contact and separation of the moving contact and the fixed contact to realize the connection or disconnection of SF 6 A primary power supply of the main transformer body; the thermal imaging temperature sensing unit comprises a sensor arranged on SF 6 Sensor outside main transformer body and extending into SF 6 Main transformer body and installed in SF 6 A plurality of infrared thermal imaging temperature sensing probes and optical fibers on the inner wall of the main transformer body; the infrared thermal imaging temperature sensing probe can carry out non-contact thermal imaging temperature measurement on the main transformer winding, and transmits temperature measurement signals to the sensor and an image display arranged in a remote control room through optical fibers, the sensor amplifies the thermal imaging temperature signals and then transmits the amplified thermal imaging temperature signals to the AD converter, the AD converter converts the transmitted thermal imaging temperature measurement electric signals into digital signals and then transmits the digital signals to the microprocessor, the microprocessor processes the digital signals and then transmits the digital signals to the DA converter, and the DA converter can convert the digital signals transmitted by the microprocessor into electric signals matched with a tripping loop of the circuit breaker and transmits the electric signals to the tripping loop of the circuit breaker to execute instructions sent by the microprocessor; the image display can observe SF at any time 6 The internal heating thermal imaging condition of the main transformer is convenient for operators to observe at any time; the microprocessor can be based on SF 6 When serious heating defect endangering safe operation occurs to main transformer winding of main transformer body, SF is automatically controlled 6 The main transformer body acts on the tripping coil of the incoming side circuit breaker to cut off the incoming power supply, thereby avoiding SF 6 The main transformer body is further damaged and even the risk of burning explosion is preventedSerious accidents of power grid accident expansion are avoided; the microprocessor is preset with a tripping temperature protection setting value and is also preset with a device for penetrating SF according to infrared rays 6 Program for correcting different reflectivity and attenuation between gas and penetrating air, and program for correcting and compensating tripping temperature under different main transformer operating loads and different environment temperatures so as to achieve SF (sulfur hexafluoride) 6 Accurate temperature sensing of the main transformer winding of the main transformer body ensures accurate action, and avoids the damage of SF caused by the fact that the heating degree is not reached 6 False tripping operation during main transformer body is more completely eradicated when SF is endangered 6 When the main transformer body and the power grid run safely, severe heating defects are caused, the tripping accident of the circuit breaker cannot be controlled rapidly, and the safety of workers and power grid equipment is guaranteed powerfully;
the electric power SF 6 The protection method of the main transformer non-electric quantity protection device comprises the following steps,
1）SF 6 the internal winding of the main transformer body heats up due to the action of current and magnetic field in electrified operation, and SF needs to be filled through the internal winding 6 The gas is cooled to ensure the operation safety;
2) According to SF 6 The running condition of main transformer body is that the programmed tripping temperature protection setting value is set in the microprocessor in advance, and the microprocessor should also penetrate SF according to the infrared ray 6 Programming procedure for correcting for different reflectivities and attenuations between gaseous medium and penetrating air medium, and for different SF 6 The main transformer is used for running load and correcting and compensating programming programs for tripping temperature under different environment temperatures;
3) At SF 6 Before the main transformer body is put into operation, the electric power SF is started 6 A main transformer non-electric quantity protection device;
4) Infrared thermal imaging temperature sensing probe pair SF 6 Performing online continuous infrared scanning temperature sensing on the effective range of a main transformer winding in the main transformer body;
5）SF 6 the main transformer body normally operates, the winding temperature value of the main transformer body does not exceed a preset tripping temperature protection setting value, and the microprocessor does not send out instructions;
6) When SF is 6 When the temperature of the main transformer winding in the main transformer body reaches a preset tripping temperature protection setting value, the microprocessor sends a tripping instruction signal to control the tripping coil of the circuit breaker to act, so that the moving contact of the circuit breaker is quickly separated from the fixed contact, and the SF is cut off 6 SF (sulfur hexafluoride) for serious heating fault of incoming side power supply of main transformer body 6 The main transformer body is forcedly isolated from the power grid, so that the safety of workers and the main transformer can be protected, and the safe operation of a large power grid can be protected.
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| CN201711307430.8A CN107834512B (en) | 2017-12-11 | 2017-12-11 | Power SF6 main transformer non-electric quantity protection device and protection method |
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| CN201711307430.8A CN107834512B (en) | 2017-12-11 | 2017-12-11 | Power SF6 main transformer non-electric quantity protection device and protection method |
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| CN107834512B true CN107834512B (en) | 2023-09-15 |
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| CN106992497A (en) * | 2017-05-27 | 2017-07-28 | 国网福建省电力有限公司 | A kind of intelligent protection device of main transformer internal discharge failure and guard method |
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| WO2016105551A1 (en) * | 2014-12-25 | 2016-06-30 | Tomimbang Wendell E | Apparatus, system and method for total protection from electrical faults |
| CN204464956U (en) * | 2015-04-03 | 2015-07-08 | 国家电网公司 | A kind of infrared optical fiber automatic trip protective device of dry-type transformer hot stall |
| CN105529684A (en) * | 2016-02-19 | 2016-04-27 | 国网福建省电力有限公司 | Infrared thermosensitive protection apparatus for substation high-voltage equipment and operating method |
| CN105633910A (en) * | 2016-02-19 | 2016-06-01 | 国网福建省电力有限公司 | Intelligent non-electricity protection device for power high-voltage switch cabinet and control method |
| CN106644138A (en) * | 2016-11-08 | 2017-05-10 | 四川瑞霆电力科技有限公司 | Circuit breaker moving contact passive wireless acquisition device and temperature measurement monitoring system |
| CN106992497A (en) * | 2017-05-27 | 2017-07-28 | 国网福建省电力有限公司 | A kind of intelligent protection device of main transformer internal discharge failure and guard method |
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