CN110829583A - Power supply switching monitoring device of main transformer cooler - Google Patents
Power supply switching monitoring device of main transformer cooler Download PDFInfo
- Publication number
- CN110829583A CN110829583A CN201911190628.1A CN201911190628A CN110829583A CN 110829583 A CN110829583 A CN 110829583A CN 201911190628 A CN201911190628 A CN 201911190628A CN 110829583 A CN110829583 A CN 110829583A
- Authority
- CN
- China
- Prior art keywords
- submodule
- alternating current
- contactor
- current contactor
- main transformer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- 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
- G01R31/40—Testing power supplies
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The application relates to a power supply switching monitoring device of a main transformer cooler, which comprises a dual-power switching device and control equipment, wherein the dual-power switching device comprises a first alternating current contactor and a second alternating current contactor; the input end of the first alternating current contactor is connected with a first input power supply, and the output end of the first alternating current contactor is connected with a main transformer cooler; the input end of the second alternating current contactor is connected with a second input power supply, and the output end of the second alternating current contactor is connected with a main transformer cooler; the dual-power switching device also comprises a first relay connected in series with a control loop of the first alternating-current contactor, and a second relay connected in series with a control loop of the second alternating-current contactor; the control equipment is respectively connected with the first relay and the second relay; and the control equipment generates corresponding fault alarm information according to the acquired voltage and current data. The device of this application has simplified the switching monitoring work flow of main transformer cooler power, has reduced the fortune dimension cost, and has improved dual supply switching monitoring reliability.
Description
Technical Field
The application relates to the technical field of electric power systems, in particular to a power supply switching monitoring device for a main transformer cooler.
Background
In the power system, the transformer always plays the roles of changing the voltage grade and transmitting alternating current electric energy. Just so, the transformer can produce no-load loss and load loss when the operation, and these two kinds of losses will be converted into heat energy, make the transformer temperature rise, if not in time dispel the heat and go out, too high temperature will cause transformer efficiency to reduce, insulation damage, life reduce. At present, forced oil circulation air cooling is required to be adopted for a large main transformer, convection of upper hot oil and lower cold oil in the transformer is accelerated, the upper hot oil and the lower cold oil flow back to an oil tank after being cooled by a cooler, the transformer is enabled to operate within an allowable temperature rise range, and safe operation of the main transformer is guaranteed. However, in actual operation and maintenance, the design of the control loop of the cooler still has certain defects, and if a certain element fails to cause the cooler to be automatically switched to the standby power supply, a main transformer trip accident can be caused. Therefore, whether the switching of the main transformer cooler power supply is reliable or not directly influences whether the cooler can work normally or not, and indirectly influences whether the transformer can run safely or not.
In the implementation process, the inventor finds that at least the following problems exist in the conventional technology: with the increase of the number of transformer substations and the reduction of personnel, the per-capita workload is increased sharply, two operators, vehicles and the cost of road time are needed for the traditional switching monitoring of the power supply of the main transformer cooler, complex processes such as plan dispatching, work ticket handling, operation instruction execution and the like are involved in the work flow, the operation and maintenance cost is high, and the switching reliability is low.
Disclosure of Invention
Based on this, it is necessary that the traditional problem of switching monitoring work flow to main transformer cooler power is complicated, and the operation and maintenance cost is high, and switches the low reliability, provides a main transformer cooler power and switches monitoring devices.
In order to achieve the above object, an embodiment of the present invention provides a main transformer cooler power supply switching monitoring device, including:
the double-power switching device comprises a first alternating current contactor and a second alternating current contactor; the normally closed contact of the first alternating current contactor is connected in series with a coil loop of the second alternating current contactor, the input end of the first alternating current contactor is connected with a first input power supply, and the output end of the first alternating current contactor is used for being connected with a main transformer cooler; the normally closed contact of the second alternating current contactor is connected in series with the coil loop of the first alternating current contactor, the input end of the second alternating current contactor is connected with a second input power supply, and the output end of the second alternating current contactor is used for being connected with a main transformer cooler; the dual-power switching device also comprises a first relay connected in series between the normally closed contact of the first alternating-current contactor and the coil loop of the second alternating-current contactor, and a second relay connected in series between the normally closed contact of the second alternating-current contactor and the coil loop of the first alternating-current contactor;
the control equipment is respectively connected with the first relay and the second relay; the control equipment generates corresponding fault warning information according to the collected first input voltage of the first alternating current contactor, the collected first input current of the first alternating current contactor, the collected second input voltage of the second alternating current contactor, the collected second input current of the second alternating current contactor and the collected input voltage of the main transformer cooler.
In one embodiment, the control device comprises a processing chip and an acquisition module connected with the processing chip;
the first voltage acquisition port of the acquisition module is connected with the input end of the first alternating current contactor, the second voltage acquisition port is connected with the input end of the second alternating current contactor, the third voltage acquisition port is connected with the input end of the main transformer cooler, the first current acquisition port is connected with the input end of the first alternating current contactor, and the second current acquisition port is connected with the input end of the second alternating current contactor.
In one embodiment, the collecting module comprises a first voltage collecting module, a second voltage collecting module, a third voltage collecting module, a first current collecting module and a second current collecting module which are respectively connected with the processing chip;
the first voltage acquisition module is connected with the input end of the first alternating current contactor; the second voltage acquisition module is connected with the input end of the second alternating current contactor; the third voltage acquisition module is connected with the input end of the main transformer cooler; the first current acquisition module is connected with the input end of the first alternating current contactor; the second current acquisition module is connected with the input end of the second alternating current contactor.
In one embodiment, the first voltage acquisition module comprises a first resistance voltage division submodule, a first isolation amplification submodule, a first operational amplification submodule and a first sampling submodule which are connected in sequence; the first resistance voltage division submodule is connected with the input end of the first alternating current contactor; the first sampling submodule is connected with the processing chip;
the second voltage acquisition module comprises a second resistance voltage division submodule, a second isolation amplification submodule, a second operational amplification submodule and a second sampling submodule which are connected in sequence; the second resistance voltage division submodule is connected with the input end of the second alternating current contactor; the second sampling submodule is connected with the processing chip;
the third voltage acquisition module comprises a third resistance voltage division submodule, a third isolation amplification submodule, a third operational amplification submodule and a third sampling submodule which are connected in sequence; the third resistance voltage division submodule is connected with the input end of the main transformer cooler; and the third sampling submodule is connected with the processing chip.
In one embodiment, the first current collection module comprises a first primary amplification submodule, a first secondary amplification submodule and a fourth sampling submodule connected with the processing chip; the input end of the first primary amplification submodule is connected with the input end of the first alternating current contactor, the first output end of the first primary amplification submodule is used for being connected with the fourth sampling submodule, and the second output end of the first primary amplification submodule is connected with the input end of the first secondary amplification submodule; the output end of the first secondary amplification submodule is used for being connected with the fourth sampling submodule;
the second current acquisition module comprises a second primary amplification submodule, a second secondary amplification submodule and a fifth sampling submodule connected with the processing chip; the input end of the second primary amplification submodule is connected with the input end of the second alternating current contactor, the first output end of the second primary amplification submodule is used for connecting the fifth sampling submodule, and the second output end of the second primary amplification submodule is connected with the input end of the second secondary amplification submodule; and the output end of the second-stage amplification submodule is used for connecting the fifth sampling submodule.
In one embodiment, the control device further comprises a touch screen and an alarm module which are respectively connected with the processing chip.
In one embodiment, the main transformer cooler power switching monitoring device further comprises a current generating loop connected to an input end of the main transformer cooler.
In one embodiment, the main transformer cooler power switching monitoring device further comprises a third relay connected in series with the current generating circuit.
In one embodiment, the third relay is a normally open relay.
In one embodiment, the first relay is a normally closed relay; the second relay is a normally closed relay.
One of the above technical solutions has the following advantages and beneficial effects:
in each embodiment of the above-mentioned power switching monitoring device for the main transformer cooler, the normally closed contact of the first ac contactor is connected in series with the coil loop of the second ac contactor, the input end is connected to the first input power supply, and the output end is used for connecting the main transformer cooler; the normally closed contact of the second alternating current contactor is connected in series with the coil loop of the first alternating current contactor, the input end of the second alternating current contactor is connected with a second input power supply, and the output end of the second alternating current contactor is used for being connected with a main transformer cooler; the first relay is connected between the normally closed contact of the first alternating current contactor and the coil loop of the second alternating current contactor in series, and the second relay is connected between the normally closed contact of the second alternating current contactor and the coil loop of the first alternating current contactor in series; the control equipment is respectively connected with the first relay and the second relay; the control equipment generates corresponding fault warning information according to the collected first input voltage of the first alternating current contactor, the collected first input current of the first alternating current contactor, the collected second input voltage of the second alternating current contactor, the collected second input current of the second alternating current contactor and the collected input voltage of the main transformer cooler. This application can monitor the quality of two way input power, to voltage abnormity, lack looks scheduling problem automatic control switching power supply, realizes the real time monitoring to the power supply of main change cooler, to dual power supply switching device performance quality, device maintenance cycle suggestion etc. has that measurement accuracy is high, stability, characteristics that the interference killing feature is strong, has simplified the switching monitoring work flow of main change cooler power, has reduced the fortune dimension cost, and has improved dual power supply switching monitoring reliability.
Drawings
FIG. 1 is a schematic diagram of a first configuration of a power switching monitoring device for a main transformer cooler in one embodiment;
FIG. 2 is a second schematic diagram of an embodiment of a main transformer cooler power switching monitoring apparatus;
FIG. 3 is a schematic diagram of a voltage acquisition module according to an embodiment;
FIG. 4 is a schematic diagram of the electrical circuit of the voltage acquisition module in one embodiment;
FIG. 5 is a schematic structural diagram of a current collection module in one embodiment;
FIG. 6 is a schematic diagram of the electrical circuit of the current collection module in one embodiment;
FIG. 7 is a schematic diagram of a third configuration of a power switching monitoring device for a main transformer cooler in one embodiment;
FIG. 8 is a fourth schematic diagram of an embodiment of a power switching monitoring apparatus for a main transformer cooler;
FIG. 9 is a fifth schematic diagram of an embodiment of a power switching monitoring device of a main transformer cooler.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve the problems of complicated work flow, high operation and maintenance cost and low switching reliability of the conventional switching monitoring of the main transformer cooler power supply, in an embodiment, as shown in fig. 2, a main transformer cooler power supply switching monitoring device is provided, which includes:
a dual power switching device 110, the dual power switching device 110 including a first ac contactor 112 and a second ac contactor 114; the normally closed contact of the first ac contactor 112 is connected in series to the coil loop of the second ac contactor 114, the input end is connected to the first input power supply 130, and the output end is used for connecting the main transformer cooler 150; the normally closed contact of the second ac contactor 114 is connected in series to the coil loop of the first ac contactor 112, the input end is connected to the second input power supply 140, and the output end is used for connecting the main transformer cooler 150; the dual power supply switching device 110 further includes a first relay 116 connected in series between the normally closed contact of the first ac contactor 112 and the coil circuit of the second ac contactor 114, and a second relay 118 connected in series between the normally closed contact of the second ac contactor 114 and the coil circuit of the first ac contactor 112;
the control device 120, the control device 120 is respectively connected with the first relay 116 and the second relay 118; the control device 120 generates corresponding fault warning information according to the collected first input voltage of the first ac contactor 112, the first input current of the first ac contactor 112, the second input voltage of the second ac contactor 114, the second input current of the second ac contactor 114, and the input voltage of the main transformer cooler 150.
The dual power switching device 110 can be used to switch the power supply channels of the first input power 130 and the second input power 140; for example, when the first input power source 130 is powered off, the dual power source switching device 110 can switch the power supply channel of the first input power source 130 to the power supply channel of the second input power source 140 in time, so as to supply power to the load timely and uninterruptedly. The first ac contactor 112 refers to an electric appliance that uses a coil to flow ac current to generate a magnetic field in industrial electricity, so that contacts are closed to control a load. Alternatively, the first ac contactor 112 may be an electromagnetic ac contactor or a vacuum ac contactor. The second ac contactor 114 refers to an electric appliance that uses a coil to flow ac current to generate a magnetic field in industrial electricity, so that contacts are closed to control a load. Alternatively, the second ac contactor 114 may be an electromagnetic ac contactor or a vacuum ac contactor. It should be noted that the first ac contactor 112 may include a normally closed contact (i.e., a normally closed contact) and a normally open contact (i.e., a normally open contact); the second ac contactor 114 may include a normally closed contact (i.e., a normally closed contact) and a normally open contact (i.e., a normally open contact). The normally open contact refers to the state that the main contact of the alternating current contactor is in disconnection, the normally open contact is disconnected, and after the main contact is closed, the normally open contact is closed and is commonly used for realizing the self-locking function of the contactor. The normally closed contact refers to a state that a main contact of the alternating current contactor is in an open state, the normally closed contact is closed, and after the main contact is closed, the normally closed contact is opened and is commonly used for realizing an interlocking lock function of the contactor.
The first input power source 130 refers to a three-phase input power source; the second input power 140 refers to a three-phase input power. The main transformer cooler 150 refers to a cooler for a main transformer. Coolers are a class of heat exchange devices that cool a fluid. For example, water, air or oil as a coolant to remove heat. The first relay 116 is an electric control device that generates a predetermined step change in a controlled amount in an electric output circuit when a change in an input amount (excitation amount) meets a predetermined requirement. The second relay 118 is an electric control device that generates a predetermined step change in the controlled amount in the electric output circuit when a change in the input amount (excitation amount) meets a predetermined requirement. The control device 120 refers to a device having functions of data processing, data transmission, and the like.
The first input voltage refers to an ac voltage transmitted from the first input power source 130 to the first ac contactor 112. The first input current refers to an alternating current transmitted by the first input power source 130 to the first ac contactor 112. The second input voltage refers to an ac voltage transmitted from the second input power source 140 to the second ac contactor 114. The second input current refers to an alternating current transmitted by the second input power source 140 to the second ac contactor 114. The input voltage to the main transformer cooler 150 refers to the ac voltage that powers the main transformer cooler. The alarm mode of the fault alarm information can be, but is not limited to, an acoustic alarm, a light alarm and a text prompt alarm. In one example, the fault warning information may be a dual power switching device fault warning information, an input power source fault warning information, an auxiliary contact fault information of a dual power switching device, and the like.
Specifically, the first ac contactor 112 and the second ac contactor 114 each use a normally closed contact of the other to form a control loop, thereby realizing an interlock automatic switching function. When the dual power switching device is operated, one of 2 input power supplies is used as a standby power supply, for example, the main power supply of the first input power supply 130, and the second input power supply 140 is a standby power supply; the power-on loop is a main loop, and the power-on loop is a standby loop. A normally closed contact of the first ac contactor 113 and a coil circuit of the second ac contactor 114 are connected in series through a first relay 116; the second relay 118 is connected in series between the normally closed contact of the second ac contactor 114 and the coil loop of the first ac contactor 112, that is, two relays (the first relay 116 and the second relay 118) are respectively connected in series to enter the control loops of the first ac contactor 112 and the second ac contactor 114, and whether the dual power switching device 110 generates a fault or not and can analyze the type of the specifically generated fault is judged by the control device 120 according to the collected first input voltage, the second input voltage, the first input current, the second input current and the input voltage of the main transformer cooler, so as to generate corresponding fault alarm information, thereby realizing an automatic switching test of the dual power switching device and a fault detection alarm of the dual power switching device.
In the embodiment of the power switching monitoring device of the main transformer cooler, the normally closed contact of the first ac contactor is connected in series with the coil loop of the second ac contactor, the input end of the first ac contactor is connected to the first input power supply, and the output end of the first ac contactor is used for connecting the main transformer cooler; the normally closed contact of the second alternating current contactor is connected in series with the coil loop of the first alternating current contactor, the input end of the second alternating current contactor is connected with a second input power supply, and the output end of the second alternating current contactor is used for being connected with a main transformer cooler; the first relay is connected between the normally closed contact of the first alternating current contactor and the coil loop of the second alternating current contactor in series, and the second relay is connected between the normally closed contact of the second alternating current contactor and the coil loop of the first alternating current contactor in series; the control equipment is respectively connected with the first relay and the second relay; the control equipment generates corresponding fault warning information according to the collected first input voltage of the first alternating current contactor, the collected first input current of the first alternating current contactor, the collected second input voltage of the second alternating current contactor, the collected second input current of the second alternating current contactor and the collected input voltage of the main transformer cooler. By monitoring the quality of two paths of input power supplies, the switching power supply is automatically controlled aiming at the problems of abnormal voltage, phase failure and the like, the real-time monitoring of the power supply of the main transformer cooler is realized, and the characteristics of high measurement precision, high stability and strong anti-interference performance are realized for the performance quality of the double-power switching device, the maintenance and overhaul period prompt of the device and the like, so that the switching monitoring working flow of the main transformer cooler power supply is simplified, the operation and maintenance cost is reduced, and the reliability of double-power switching monitoring is improved.
In a specific embodiment, the first relay is a normally closed relay; the second relay is a normally closed relay.
Specifically, normally closed relays are selected by the first relay and the second relay respectively, so that the situation that an interlocking loop of the dual-power switching device is not affected when the device is powered down or fails can be guaranteed, and the first relay or the second relay is controlled to be disconnected through the control equipment when a test is needed.
In one embodiment, as shown in fig. 2, there is provided a main transformer cooler power switching monitoring device, which includes a dual power switching device 210 and a control apparatus 220; the dual power switching device 210 includes a first ac contactor 212 and a second ac contactor 214; dual power supply switching device 210 also includes a first relay 216 and a second relay 218; the control device 220 includes a processing chip 222 and an acquisition module 224 coupled to the processing chip 222.
The first voltage collecting port of the collecting module 224 is connected to the input terminal of the first ac contactor 212, the second voltage collecting port is connected to the input terminal of the second ac contactor 214, the third voltage collecting port is connected to the input terminal of the main transformer cooler 250, the first current collecting port is connected to the input terminal of the first ac contactor 212, and the second current collecting port is connected to the input terminal of the second ac contactor 214.
The processing chip 222 may be, but is not limited to, a single chip (e.g., 51-series processing chips), a DSP processing chip, and an ARM processing chip. The acquisition module 224 may include at least one voltage acquisition sub-module and at least one current acquisition sub-module. The acquisition module 224 may be used to acquire a first input voltage of the first ac contactor 212, a first input current of the first ac contactor 212, a second input voltage of the second ac contactor 214, a second input current of the second ac contactor 214, and an input voltage of the main transformer cooler 250.
Specifically, the first voltage collecting port, the second voltage collecting port, the third voltage collecting port, the first current collecting port and the second current collecting port are set based on the collecting module 224. And then 3-path alternating voltage and 2-path alternating current can be collected, and corresponding first input power supply 230 fault alarm information, second input power supply 240 fault alarm information and/or contactor fault alarm information can be generated according to the collected voltage and current data. Wherein, each circuit of alternating voltage sampling respectively adopts three-phase voltage, and then the processing chip 222 judges whether the power supply has undervoltage and open-phase fault according to each voltage; the processing chip 222 can also automatically switch the power supply of the main transformer cooler in a timed manner.
In the embodiment, the fault alarm can be sent out by monitoring the faults such as open phase, undervoltage and the like, background monitoring is realized, the field condition is mastered in time, time is won for field fault rescue work, and the efficiency is improved; the intelligent power grid operation mode replaces manual daily regular test switching work, and power grid intelligent operation is achieved.
In a specific embodiment, as shown in fig. 2, the collection module 224 includes a first voltage collection module 272, a second voltage collection module 274, a third voltage collection module 276, a first current collection module 278, and a second current collection module 282, which are respectively connected to the processing chip.
The first voltage collecting module 272 is connected to the input end of the first ac contactor 212; the second voltage collecting module 274 is connected to the input end of the second ac contactor 214; the third voltage acquisition module 276 is connected with the input end of the main transformer cooler 250; the first current collection module 278 is connected to an input of the first ac contactor 212; the second current collecting module 282 is connected to an input terminal of the second ac contactor 214.
The first voltage collecting module 272 may be, but is not limited to, a voltage transformer or a hall voltage sensor. The second voltage acquisition module 274 may be, but is not limited to, a voltage transformer or a hall voltage sensor. The third voltage acquisition module 276 can be, but is not limited to, a voltage transformer or a hall voltage sensor. The first current collection module 278 may be, but is not limited to, an electromagnetic current transformer or an electronic current transformer. The second current collection module 282 may be, but is not limited to, an electromagnetic current transformer or an electronic current transformer.
It should be noted that the first voltage collection module 272, the second voltage collection module 274, the third voltage collection module 276, the first current collection module 278, and the second current collection module 282 may respectively include an AD (digital-to-analog) converter.
Specifically, based on the first voltage collecting module 272 being connected to the input terminal of the first ac contactor 212, the first voltage collecting module 272 may collect a first input voltage and transmit the collected first input voltage to the processing chip 222; the second voltage collecting module 274 is connected to the input end of the second ac contactor 214, and then the second voltage collecting module 274 can collect the second input voltage and transmit the collected second input voltage to the processing chip 222; the third voltage acquisition module 276 is connected to the input end of the main transformer cooler 250, and further the third voltage acquisition module 276 can acquire the input voltage of the main transformer cooler 250 and transmit the acquired input voltage of the main transformer cooler 250 to the processing chip 222; the first current collecting module 278 is connected to the input end of the first ac contactor 212, and the first current collecting module 278 can collect the first input current and transmit the collected first input current to the processing chip 222; the second current collecting module 282 is connected to the input terminal of the second ac contactor 214, and the second current collecting module 282 can collect the first input current and transmit the collected first input current to the processing chip 222. The processing chip 222 can generate corresponding first input power failure warning information, second input power failure warning information and/or contactor failure warning information according to the collected voltage and current data, so that corresponding failure warning is sent by monitoring the voltage and current data, the field condition is timely mastered, time is won for field failure rescue work, and the dual-power switching monitoring reliability is improved.
In a specific embodiment, as shown in fig. 3, the first voltage acquisition module 310 includes a first resistance voltage-dividing submodule 312, a first isolation amplifier submodule 314, a first operational amplifier submodule 316, and a first sampling submodule 318, which are connected in sequence; the first resistance voltage-dividing submodule 312 is connected to an input end of the first ac contactor; the first sampling submodule 318 is coupled to the processing chip.
Specifically, the first resistive voltage divider submodule 312 may be configured to perform resistive voltage division on the input voltage transmitted from the first input power source to the first ac contactor, and proportionally reduce the voltage to a voltage in the order of millivolts. The first isolation amplifying submodule 314 may be configured to perform isolation amplification on the divided voltage signal output by the first resistance voltage dividing submodule 312. The first operational amplifier submodule 316 may be configured to perform equal-scale operational amplification on the isolated and amplified voltage signal, and further may collect the equal-scale operational amplified voltage signal through the first sampling submodule 318, and transmit the sampled voltage signal to the processing chip.
In one example, the first isolation amplifier sub-module may include an isolation amplifier; the first sampling submodule may include an AD converter.
In a specific embodiment, as shown in fig. 3, the second voltage collecting module 320 includes a second resistance voltage dividing submodule 322, a second isolation amplifying submodule 324, a second operational amplifying submodule 326 and a second sampling submodule 328, which are connected in sequence; the second resistance voltage-dividing submodule 322 is connected with the input end of the second alternating current contactor; the second sampling submodule 328 is connected to the processing chip.
Specifically, the second resistance voltage divider submodule 322 may be configured to perform resistance voltage division on the input voltage transmitted from the second input power source to the second ac contactor, and proportionally reduce the voltage to a voltage in the order of millivolts. The second isolation amplifying submodule 324 may be configured to perform isolation amplification on the divided voltage signal output by the second resistance voltage dividing submodule 322. The second operational amplifier submodule 326 may be configured to perform equal-scale operational amplification on the isolated and amplified voltage signal, and further may collect the equal-scale operational amplified voltage signal through the second sampling submodule 328, and transmit the sampled voltage signal to the processing chip.
In one example, the second isolation amplifier sub-module may include an isolation amplifier; the second sampling submodule may include an AD converter.
In a specific embodiment, as shown in fig. 3, the third voltage collecting module 330 includes a third resistance voltage dividing submodule 332, a third isolation amplifying submodule 334, a third operational amplifying submodule 336 and a third sampling submodule 338 which are connected in sequence; the third resistance voltage division submodule 332 is connected with the input end of the main transformer cooler; the third sampling submodule 338 is connected to the processing chip.
Specifically, the third resistive voltage divider submodule 332 may be configured to resistively divide the input voltage to the main transformer cooler to reduce the voltage to a millivolt level. The third isolation amplifying submodule 334 may be configured to perform isolation amplification on the divided voltage signal output by the third resistance voltage dividing submodule 332. The third operational amplifier submodule 336 may be configured to perform equal-scale operational amplification on the isolated and amplified voltage signal, and further may collect the equal-scale operational amplified voltage signal through the third sampling submodule 338, and transmit the sampled voltage signal to the processing chip.
In one example, the third isolated amplification sub-module may include an isolated amplifier; the third sampling submodule may include an AD converter.
In one example, as shown in fig. 4, a schematic circuit diagram of a voltage acquisition module (a first voltage acquisition module, a second voltage acquisition module, or a third voltage acquisition module) is provided, which can sample 3 phase voltage quantities, and can accurately determine the input quality of a first input voltage and a second input voltage, and the output quality of an input voltage of a main transformer cooler; the quality of the double alternating current power supply can be judged through the input quality, a basis is provided for automatic switching of the device, and the main transformer cooler is ensured not to have a phase-lack fault; the switching reliability of the dual-power switching device can be judged through the output quality, and the fault is timely alarmed and repaired.
In one embodiment, as shown in fig. 5, the first current collection module 510 includes a first primary amplification sub-module 512, a first secondary amplification sub-module 514, and a fourth sampling sub-module 516 connected to the processing chip; the input end of the first primary amplification submodule 512 is connected with the input end of the first alternating current contactor, the first output end of the first primary amplification submodule 512 is used for being connected with the fourth sampling submodule 516, and the second output end of the first primary amplification submodule is connected with the input end of the first secondary amplification submodule 514; the output of the first secondary amplification sub-module 514 is connected to a fourth sampling sub-module 516.
The first primary amplification submodule 512 includes 2 output ports (a first output terminal and a second output terminal), and the first primary amplification submodule 512 is configured to amplify an input current signal transmitted from the first input power source to the first ac contactor; and the amplified current signals can be generated through the first output terminal and the second output terminal, respectively, and then the fourth sampling sub-module 516 can collect the current signals transmitted by the first output terminal of the first primary amplification sub-module 512. The current signal after the first-stage amplification processing can also be transmitted to the first secondary amplification submodule 514 through a second output end, and the first secondary amplification submodule 514 can be used for performing second-stage amplification processing on the received current signal; and the amplified current signal is transmitted to a fourth sampling submodule, and then the fourth sampling submodule can acquire the transmitted current signal of the first secondary amplification submodule, so that wide-range high-precision current sampling is realized.
In one example, the first primary amplification sub-module may include a voltage follower amplifier.
In one example, the first current collection module may further include a first filtering module connected between the input of the first ac contactor and the first primary amplification sub-module.
In a specific embodiment, as shown in fig. 5, the second current collecting module 520 includes a second primary amplifying submodule 522, a second secondary amplifying submodule 524, and a fifth sampling submodule 526 connected to the processing chip; the input end of the second first-stage amplification submodule 522 is connected with the input end of the second alternating-current contactor, the first output end of the second first-stage amplification submodule 522 is used for being connected with the fifth sampling submodule 526, and the second output end of the second first-stage amplification submodule is connected with the input end of the second-stage amplification submodule 524; the output of the second stage amplification submodule 524 is connected to a fifth sampling submodule 526.
The second-stage amplification submodule 522 includes 2 output ports (a first output port and a second output port), and the second-stage amplification submodule 522 is configured to amplify an input current signal, which is transmitted from the second input power source to the second ac contactor; and the amplified current signals may be generated through the first output terminal and the second output terminal, respectively, and then the fifth sampling submodule 526 may collect the current signals transmitted by the first output terminal of the second-stage amplification submodule 522. The current signal after the first-stage amplification can also be transmitted to a second-stage amplification submodule 524 through a second output end, and the second-stage amplification submodule 524 can be used for performing second-stage amplification processing on the received current signal; and the amplified current signal is transmitted to the fifth sampling submodule 526, and then the fifth sampling submodule 526 can acquire the current signal transmitted by the second-stage amplification submodule 624, so that wide-range high-precision current sampling is realized.
In one example, the second stage amplification sub-module may include a voltage follower amplifier.
In one example, the second current collection module may further include a second filtering module connected between the input of the second ac contactor and the second one-stage amplifier sub-module.
In one example, as shown in fig. 6, a schematic circuit diagram of a current acquisition module (a first current acquisition module or a second current acquisition module) is provided. The current signals are filtered, then pass through a first-stage amplifier, are divided into two paths and are respectively subjected to voltage following amplification, one path of signals are subjected to following amplification and then sampled, and the other path of signals are subjected to second-stage amplification and then sampled; the reverse input end of the amplifier is used as signal input, and the forward input end of the operational amplifier is designed with a high voltage level. For example, the design target accurately samples 1-200A current, and the end AD1 or the end AD2 is selected in a range self-adaptive mode to perform AD conversion, so that wide-range high-precision current sampling is achieved. The measuring precision is improved by setting two-pole amplification self-adaptive gear selection test current.
In one embodiment, as shown in FIG. 7, a main transformer cooler power switching monitoring device is provided. The device comprises a dual power supply switching device 710 and a control device 720; the dual power switching device 710 includes a first ac contactor 712 and a second ac contactor 714; dual power supply switching device 710 also includes a first relay 716 and a second relay 718; the control device 720 includes a processing chip 722 and an acquisition module 724 coupled to the processing chip 722. The control device 720 further includes a touch screen 726 and an alarm module 728 respectively connected to the processing chip 722.
The touch screen 726 may be, but is not limited to, a resistive touch screen, a capacitive touch screen, an infrared touch screen, or the like; touch screen 726 may be used to perform man-machine switching functions of the device. The alert module 728 may be a flashing light and/or a buzzer.
Specifically, the control device 720 determines whether the dual power switching device 710 has a fault and can analyze a specific fault type generated according to the collected first input voltage, second input voltage, first input current, second input current and input voltage of the main transformer cooler, so as to generate corresponding fault alarm information, transmit the generated fault alarm information to the touch screen 726, and display the fault alarm information in real time through the touch screen 726; meanwhile, the departure alarm module 728 generates a fault alarm, so that an automatic switching test of the dual power switching device 710 is realized, and a fault detection alarm of the dual power switching device 710 is given.
In one example, the control device further comprises a 485 communication module. The 485 communication module can be used for transmitting measurement information such as first input voltage, second input voltage, third input voltage, first input current, second input current, fault information and the like.
In one embodiment, as shown in fig. 8, a main transformer cooler power switching monitoring device is provided. The device comprises a dual power switching device 810 and a control device 820; dual power supply switching device 810 includes a first ac contactor 812 and a second ac contactor 814; the dual power switching device 810 also includes a first relay 816 and a second relay 818. The main transformer cooler power switching monitoring device further comprises a current generation loop 860 connected to an input end of the main transformer cooler.
The current generating circuit 860 may be used to collect the current at the input of the main transformer cooler. Further, the current generating circuit 830 may be configured to collect a working single-phase current of the main transformer cooler, and the control device 820 may perform corresponding fault alarm according to the working single-phase current of the main transformer cooler.
In a specific embodiment, as shown in fig. 8, the main transformer cooler power switching monitoring device further comprises a third relay 870 connected in series with the current generating circuit 860.
The third relay finger 870 is an electric control device that generates a predetermined step change in the controlled amount in the electric output circuit when the change in the input amount (excitation amount) meets a predetermined requirement.
In a specific embodiment, the third relay is a normally open relay. The third relay is through selecting normally open relay, just puts into when necessary and carries out current acquisition, avoids increasing unnecessary load for main power supply circuit, has improved dual supply switching monitoring reliability.
In one example, as shown in fig. 9, a main transformer cooler power switching monitoring device is provided. The first alternating current contactor KM1 and the second alternating current contactor KM2 respectively use the normally closed contacts of the opposite sides to form a control loop, and the interlocking automatic switching function is realized. Two normally closed relays (a first relay KU1 and a second relay KU2) are selected and connected in series to enter a control loop of a first alternating current contactor KM1 and a second alternating current contactor KM2 respectively, control equipment samples a first input voltage V1, a second input voltage V2, a first input current I1, a second input current I2 and an input voltage V3 of a main transformer cooler respectively, and a current generation loop R and a normally open relay (a third relay KU3) are designed.
Specifically, the control apparatus can design the timing switching time, which can be tested under normal conditions of V1, V2 and V3 by sampling V1, V2 and V3. If some power supply of the V1 and the V2 is abnormal, the test is forbidden and power supply input fault information is generated; if V3 is abnormal, generating failure information of the dual power supply switching device, and switching to a standby loop to operate to ensure normal work of the load. The equipment normally runs with KU1 and KU2 not acting, so as to ensure the control main loop to be smooth; during the test, firstly, a relay (a first relay or a second relay) of the operation loop is disconnected for 1s, and then the operation loop is reset; and after the standby power supply is tested to be normally put into use, the control relay (the second relay or the first relay) of the standby power supply control loop is disconnected, and the standby power supply control loop is reset after being disconnected for 1 s. And judging whether the double power supplies are switched to the secondary side through V3, if the V3 is abnormal, generating abnormal alarm information of the double power supply switching device. When both I1 and I2 are 0, the current generation circuit is switched on for judgment.
It should be noted that when detecting that V3 is abnormal, a switching failure message of the dual power switching device is generated, and emergency maintenance is required; when current exists in both I1 and I2, the auxiliary contact of the dual-power switching device is failed, and the dual-power switching device needs to be repaired.
In the embodiment, the quality of the power supply is input through the monitoring device, the switching power supply is automatically controlled to monitor in real time aiming at the problems of voltage abnormity, phase failure and the like, and the performance quality of the dual-power switching device, the maintenance and overhaul period of the device and the like are prompted. The method has the characteristics of high measurement precision, high stability and high anti-interference performance, simplifies the switching monitoring working process of the main transformer cooler power supply, reduces the operation and maintenance cost, and improves the dual-power switching monitoring reliability.
It should be noted that, the first ac contactor and the second ac contactor are designed with mechanical buttons to control on and off, and the mechanical buttons can be used for setting a main loop and a standby loop on site, and can also be used for checking whether the actions are normal during testing.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a main transformer cooler power switching monitoring devices which characterized in that includes:
a dual power switching device comprising a first AC contactor and a second AC contactor; the normally closed contact of the first alternating current contactor is connected in series with a coil loop of the second alternating current contactor, the input end of the first alternating current contactor is connected with a first input power supply, and the output end of the first alternating current contactor is used for being connected with a main transformer cooler; the normally closed contact of the second alternating current contactor is connected in series with the coil loop of the first alternating current contactor, the input end of the second alternating current contactor is connected with a second input power supply, and the output end of the second alternating current contactor is used for being connected with the main transformer cooler; the dual-power switching device also comprises a first relay connected in series between the normally closed contact of the first alternating-current contactor and the coil loop of the second alternating-current contactor, and a second relay connected in series between the normally closed contact of the second alternating-current contactor and the coil loop of the first alternating-current contactor;
the control equipment is respectively connected with the first relay and the second relay; and the control equipment generates corresponding fault warning information according to the collected first input voltage of the first alternating current contactor, the collected first input current of the first alternating current contactor, the collected second input voltage of the second alternating current contactor, the collected second input current of the second alternating current contactor and the collected input voltage of the main transformer cooler.
2. The main transformer cooler power switching monitoring device of claim 1, wherein the control equipment comprises a processing chip and an acquisition module connected to the processing chip;
the first voltage acquisition port of the acquisition module is connected with the input end of the first alternating current contactor, the second voltage acquisition port is connected with the input end of the second alternating current contactor, the third voltage acquisition port is connected with the input end of the main transformer cooler, the first current acquisition port is connected with the input end of the first alternating current contactor, and the second current acquisition port is connected with the input end of the second alternating current contactor.
3. The power switching monitoring device of a main transformer cooler of claim 2, wherein the collection module comprises a first voltage collection module, a second voltage collection module, a third voltage collection module, a first current collection module and a second current collection module respectively connected to the processing chip;
the first voltage acquisition module is connected with the input end of the first alternating current contactor; the second voltage acquisition module is connected with the input end of the second alternating current contactor; the third voltage acquisition module is connected with the input end of the main transformer cooler; the first current acquisition module is connected with the input end of the first alternating current contactor; and the second current acquisition module is connected with the input end of the second alternating current contactor.
4. The main transformer cooler power switching monitoring device of claim 3, wherein the first voltage acquisition module comprises a first resistance voltage division submodule, a first isolation amplification submodule, a first operational amplification submodule and a first sampling submodule which are connected in sequence; the first resistance voltage division submodule is connected with the input end of the first alternating current contactor; the first sampling submodule is connected with the processing chip;
the second voltage acquisition module comprises a second resistance voltage division submodule, a second isolation amplification submodule, a second operational amplification submodule and a second sampling submodule which are connected in sequence; the second resistance voltage division submodule is connected with the input end of the second alternating current contactor; the second sampling submodule is connected with the processing chip;
the third voltage acquisition module comprises a third resistance voltage division submodule, a third isolation amplification submodule, a third operational amplification submodule and a third sampling submodule which are connected in sequence; the third resistance voltage division submodule is connected with the input end of the main transformer cooler; and the third sampling submodule is connected with the processing chip.
5. The main transformer cooler power switching monitoring device of claim 3, wherein the first current collection module comprises a first primary amplification submodule, a first secondary amplification submodule, and a fourth sampling submodule connected to the processing chip; the input end of the first primary amplification submodule is connected with the input end of the first alternating current contactor, the first output end of the first primary amplification submodule is used for being connected with the fourth sampling submodule, and the second output end of the first primary amplification submodule is connected with the input end of the first secondary amplification submodule; the output end of the first secondary amplification submodule is used for being connected with the fourth sampling submodule;
the second current acquisition module comprises a second primary amplification submodule, a second secondary amplification submodule and a fifth sampling submodule connected with the processing chip; the input end of the second primary amplification sub-module is connected with the input end of the second alternating current contactor, the first output end of the second primary amplification sub-module is used for being connected with the fifth sampling sub-module, and the second output end of the second primary amplification sub-module is connected with the input end of the second secondary amplification sub-module; and the output end of the second-stage amplification submodule is used for connecting the fifth sampling submodule.
6. The main transformer cooler power switching monitoring device of claim 2, wherein the control device further comprises a touch screen and an alarm module respectively connected to the processing chip.
7. The main transformer cooler power switching monitoring device of claim 1, further comprising a current generating loop connected to an input of the main transformer cooler.
8. The main transformer cooler power switching monitoring device of claim 7, further comprising a third relay connected in series with the current generating circuit.
9. The main transformer cooler power switching monitoring device of claim 8, wherein the third relay is a normally open relay.
10. The main transformer cooler power switching monitoring device of any one of claims 1 to 9, wherein the first relay is a normally closed relay; the second relay is a normally closed relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911190628.1A CN110829583A (en) | 2019-11-28 | 2019-11-28 | Power supply switching monitoring device of main transformer cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911190628.1A CN110829583A (en) | 2019-11-28 | 2019-11-28 | Power supply switching monitoring device of main transformer cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110829583A true CN110829583A (en) | 2020-02-21 |
Family
ID=69542704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911190628.1A Pending CN110829583A (en) | 2019-11-28 | 2019-11-28 | Power supply switching monitoring device of main transformer cooler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110829583A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204668A (en) * | 2022-01-28 | 2022-03-18 | 浙江机电职业技术学院 | Transformer substation environment monitoring device |
| TWI811154B (en) * | 2022-11-11 | 2023-08-01 | 群光電能科技股份有限公司 | Rack with heat-dissipation system, power supply system for rack with heat-dissipation system, and power control system of rack heat-dissipation system |
-
2019
- 2019-11-28 CN CN201911190628.1A patent/CN110829583A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204668A (en) * | 2022-01-28 | 2022-03-18 | 浙江机电职业技术学院 | Transformer substation environment monitoring device |
| TWI811154B (en) * | 2022-11-11 | 2023-08-01 | 群光電能科技股份有限公司 | Rack with heat-dissipation system, power supply system for rack with heat-dissipation system, and power control system of rack heat-dissipation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101980418B (en) | System for detecting secondary wiring of relay protection system in transformer substation on line | |
| CN109490686B (en) | Phase failure detection method and system for power transmission and transformation equipment of nuclear power plant | |
| CN104967220A (en) | Transformer substation monitoring system | |
| CN101764432B (en) | Intelligent operation box with action connection point self-checking function | |
| CN104330275B (en) | A kind of accident analysis of converter valve cooling system and diagnostic device and its implementation | |
| CN110829583A (en) | Power supply switching monitoring device of main transformer cooler | |
| CN103809058A (en) | Power supply and distribution intelligent detection system for ship | |
| CN204481478U (en) | A kind of device detecting group's alternating current filter running status | |
| CN105094039B (en) | Converter transformer cooler control cabinet intelligent control scheme man-machine interface building method | |
| CN210839063U (en) | Power supply switching monitoring device of main transformer cooler | |
| CN214622949U (en) | Testing arrangement suitable for direct current breaker with electronic control board | |
| CN112103040A (en) | Cooling monitoring system and method for transformer | |
| CN111722041A (en) | Intelligent detection method and system for low-voltage distribution board | |
| CN111596206A (en) | F-C switch opening and closing performance online evaluation method | |
| CN202949204U (en) | Intelligent fault detecting and elimination system of circuit breaker | |
| CN212063867U (en) | Intelligent motor control cabinet | |
| CN101350515A (en) | Amalgamation system for prewarning healthiness and protecting relay of large-sized asynchronous motor | |
| CN109307822A (en) | Fault detection circuit, battery roasting plant and fault detection method | |
| CN210775698U (en) | Quick detection device of electric interlocking trouble of transformer substation | |
| CN206756997U (en) | A kind of intelligence takes control breaker device for testing functions | |
| CN217639981U (en) | Power distribution room power platform monitoring system | |
| CN115032491B (en) | Non-electric quantity protection test method for transformer | |
| CN220896325U (en) | Voltage parallel monitoring device | |
| CN218974443U (en) | Current detection module | |
| CN204424870U (en) | A kind of three-phase four-wire power entangles phase protection device automatically |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200922 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Applicant before: GUANGZHOU POWER SUPPLY Co.,Ltd. |