CN107167759B - Comparison standard device for on-site self-checking of standard voltage transformer and checking method - Google Patents
Comparison standard device for on-site self-checking of standard voltage transformer and checking method Download PDFInfo
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- CN107167759B CN107167759B CN201710597898.9A CN201710597898A CN107167759B CN 107167759 B CN107167759 B CN 107167759B CN 201710597898 A CN201710597898 A CN 201710597898A CN 107167759 B CN107167759 B CN 107167759B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims description 53
- 230000005540 biological transmission Effects 0.000 claims description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 35
- 238000012795 verification Methods 0.000 claims description 29
- 239000002131 composite material Substances 0.000 claims description 21
- 239000012212 insulator Substances 0.000 claims description 21
- 238000004804 winding Methods 0.000 claims description 20
- 230000006698 induction Effects 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 8
- 239000008358 core component Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 2
- 238000002955 isolation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 230000001939 inductive effect Effects 0.000 description 10
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The embodiment of the invention discloses a standard voltage transformer on-site self-checking comparison standard device and a checking method. According to the embodiment of the invention, the isolation switch is controlled to further control the cut-in and cut-out of the comparison standard device in the mutual inductor self-checking system, so that the standard voltage mutual inductor in the mutual inductor checking system can be directly used as a tested to check and check.
Description
Technical Field
The invention relates to the field of ultrahigh voltage transformer verification, in particular to a comparison standard device for field self-verification of a standard voltage transformer and a verification method.
Background
As shown in fig. 1, the wiring schematic diagram of the voltage transformer is used for performing field error verification on the voltage transformer according to the JJG1021-2007 "power transformer" verification procedure, and the voltage transformer error verification system comprises a voltage regulator 01, a voltage booster 02, a standard voltage transformer calibrator 05 and a voltage load box, and when the transformer error is verified on site, the wiring is performed according to the schematic diagram shown in fig. 1, and the transformer error verification is performed according to the relevant regulations in the verification procedure.
However, when the error of the voltage transformer is checked on site, the error data of the tested transformer may be out of tolerance, which may be the cause of the checking system or the cause of the tested transformer itself, and at this time, the checking system is checked to determine whether the error data is out of tolerance caused by the cause of the checking system itself. The fault checking process of the checking system is very complicated, and a great deal of manpower, material resources and financial resources are wasted while the test process is delayed.
In addition, the equipment capacity adopted in the field error calibration of the ultrahigh voltage and extra-high voltage transformer is large, the equipment with large capacity is large in size and heavy in weight, the field operation difficulty is extremely high, and the fault investigation efficiency can be greatly improved if the possibility of faults of the voltage transformer test equipment can be rapidly eliminated.
Disclosure of Invention
In order to overcome the problems in the related art, the following technical scheme is disclosed:
in a first aspect, an embodiment of the present invention provides a standard voltage transformer field self-checking comparison standard device, including a test power supply, an iron core assembly, a test power supply connection module and an isolating switch, wherein the test power supply is electrically connected with the test power supply connection module, the isolating switch is electrically connected with a switch control power supply, and the test power supply connection module is fixedly connected with the iron core assembly after the isolating switch is closed,
the isolating switch comprises a transmission motor, a transmission rod, a composite insulator, a first voltage-equalizing ball, a second voltage-equalizing ball and a third conductive rod, one end of the transmission rod is rotationally connected with the transmission motor, the other end of the transmission rod is connected with the composite insulator, and the other end of the composite insulator is connected with the third conductive rod;
the test power supply connection module comprises a four-port connection pipe, wherein the four-port connection pipe comprises a first port, a second port, a third port and a fourth port, the first port and the second port are perpendicular to each other, and the third port and the fourth port are communicated along the same extending direction; the third port is the third conducting rod connecting port, and the fourth port is the iron core component connecting port.
Optionally, a third conducting rod is arranged in the four-port connecting pipe along the extending direction of the third port and the fourth port, and one end of the third conducting rod close to the third port is connected with the transmission rod through the composite insulator; and a first equalizing ball is arranged at one end of the third conducting rod close to the fourth port.
Optionally, the iron core assembly includes a primary winding, a secondary winding and an iron core, and a high-voltage end of the primary winding is provided with a second voltage equalizing ball in contact connection with the first voltage equalizing ball.
Optionally, a first conducting rod is arranged in the first through hole, and the first conducting rod is electrically connected with a high-voltage output end of a primary winding of the booster in the transformer verification system; the second conducting rod is arranged in the second port and is electrically connected with a high-voltage outlet end of the transformer checking system, and the first conducting rod, the second conducting rod and the third conducting rod are in contact connection through the four-port connecting piece.
Optionally, the transmission motor is provided with two inductive switches for controlling the transmission direction and transmission distance of the transmission motor, wherein the two inductive switches are spaced by a preset distance.
Optionally, two aluminum sheets corresponding to the inductive switches are arranged on the transmission rod, wherein the distance between the two aluminum sheets is equal to the distance between the two inductive switches.
Optionally, the switch control power supply further comprises a control panel, and the switch control power supply is electrically connected with the isolating switch through an electric connector on the control panel.
Optionally, the control panel is further provided with a power control switch, a power lamp, a closing switch, a closing indicator lamp, a separating switch and a separating indicator lamp, wherein the power control switch, the closing switch and the separating switch are used for controlling the mutual inductor to be switched in and out of the comparison standard device in the self-checking system.
Optionally, the power control switch is a switch with a lamp and a lock; the closing switch and the opening switch are self-resetting switches.
In a second aspect, an embodiment of the present invention provides a method for checking a comparison standard for field self-checking of a standard voltage transformer, including:
checking whether the output of a test power supply in the transformer checking system returns to zero or not and whether a power supply switch is disconnected or not;
if the output is returned to zero and the power supply switch is disconnected, the comparison standard device is connected;
if the output is not zeroed and/or the power supply switch is not disconnected, connecting the comparison standard device after zeroing the output and/or disconnecting the power supply switch;
connecting an external control power supply and connecting an external power supply control switch;
switching on a closing switch to enable a high-voltage end of a primary winding of an iron core component of the comparison standard device to be connected with a high-voltage output end of the transformer verification system;
switching off an external power supply control switch, switching on a power supply switch of the transformer verification system, adjusting the input of the test power supply, slowly boosting to 20% of the primary rated voltage of the standard voltage transformer, and recording test data;
continuously and slowly boosting to 50% of the primary rated voltage of the standard voltage transformer, and recording test data;
regulating the output of the test power supply, slowly reducing the voltage to zero, and switching off the power supply switch;
switching on an external power supply control switch and a switching-on and switching-off switch to disconnect a primary high-voltage end of the iron core assembly from a high-voltage output end of the transformer verification system;
and switching off a power control switch, and comparing the test data with verification data before delivery of a standard voltage transformer in the transformer verification system.
The standard voltage transformer on-site self-checking comparison standard device provided by the embodiment of the invention comprises a test power supply, an iron core assembly, a test power supply connecting module and an isolating switch, wherein the test power supply is electrically connected with the test power supply connecting module, the isolating switch is electrically connected with a switch control power supply, and after the isolating switch is closed, the test power supply connecting module is fixedly connected with the iron core assembly. According to the embodiment of the invention, the isolation switch is controlled to further control the cut-in and cut-out of the comparison standard device in the mutual inductor self-checking system, so that the standard voltage mutual inductor in the mutual inductor checking system can be directly used as a tested to check and check.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a voltage transformer error checking system;
fig. 2 is a schematic structural diagram of a comparison standard device for field self-checking of a standard voltage transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an isolating switch according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a four-port connection pipe according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a standard voltage transformer field self-checking system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the wiring of a comparison standard for on-site self-checking of a standard voltage transformer according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a field self-checking method for a standard voltage transformer according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 2, a schematic structural diagram of a standard voltage transformer on-site self-checking comparison standard provided by the embodiment of the invention is shown in fig. 2, and the standard voltage transformer on-site self-checking comparison standard provided by the embodiment of the invention comprises: test power supply 30, core assembly 50, test power connection module 40, and isolation switch 20.
The test power supply 30 is electrically connected with the test power supply connection module 40, the isolating switch 20 is electrically connected with the switch control power supply 10, after the power supply is connected, the connection and disconnection of the iron core assembly 50 and the test power supply connection module are controlled through controlling the isolating switch 20, the primary winding high-voltage end of the iron core assembly 50 is cut into the transformer self-checking system and is connected with the booster primary winding high-voltage end of the transformer self-checking system, and after the standard voltage transformer in the transformer self-checking system is used as a tested, the transformer self-checking system is formed by comparing the standard. After the core assembly 50 cuts out the transformer self-checking system, the standard voltage transformer self-checking test is ended.
Wherein,
referring to fig. 3, a schematic structural diagram of an isolating switch according to an embodiment of the present invention is shown in fig. 3, and an isolating switch 20 according to an embodiment of the present invention includes a driving motor 21, a driving rod 22, a composite insulator 23, a first equalizing ball 24, a second equalizing ball 25, and a third conductive rod 26.
The two ends of the transmission rod 22 are respectively connected with the transmission motor 21 and the composite insulator 23, the transmission motor 21 is rotationally connected with one end of the transmission rod 22 through a gear, and the other end of the transmission rod 22 is connected with the composite insulator 23. The transmission motor 21 can drive the transmission rod 22 to rotate when rotating, the transmission rod 22 is connected with the composite insulator 23, and when the transmission rod 22 rotates under the drive of the transmission motor 23, the composite insulator 23 also rotates along with the transmission rod, so that the composite insulator 23 transversely moves. The other end of the composite insulator 23 is connected with a third conducting rod 26, the tail end of the third conducting rod 26 is connected with a first equalizing ball 24, the transverse movement of the composite insulator 23 drives the third conducting rod 26 to transversely move, and finally the second equalizing ball 25 connected with the high-voltage end of the primary winding of the iron core assembly is separated and combined. The purpose of comparing the cut-in and cut-out transformer verification system of the standard device is achieved.
The 1min power frequency withstand voltage of the composite insulator 23 is 1.8 times of the primary rated voltage of a standard voltage transformer in a transformer verification system, and the damage of components caused by overhigh voltage of the isolating switch 20 in the test process can be avoided.
The test power connection module 40 includes a four-port connection pipe, see fig. 4, which is a schematic structural diagram of a four-port connection pipe provided in an embodiment of the present invention, as shown in fig. 4, the four-port connection pipe provided in an embodiment of the present invention includes a first port 41 and a second port 42 that are perpendicular to each other, and a third port 43 and a fourth port 44 that are through along the same extending direction.
The first port 41 and the second port 42 are perpendicular to the third port 43 and the fourth port 43; the inner surfaces of the third port 43 and the fourth port 44 are smooth and have no burrs, the third port 43 is connected with the composite insulator 23, and the fourth port 44 is connected with the iron core assembly 50. The test power connection module 40 is connected with the isolating switch 20, and the isolating switch 20 is controlled to control the connection and disconnection of the iron core assembly 50 and the test power connection module 40.
A third conducting rod 26 is arranged in the four-port connecting pipe along the extending direction of the third port 43 and the fourth port 44, and one end of the third conducting rod 26 close to the third port 43 is connected with the transmission rod 22 through the composite insulator 23; a first pressure equalizing ball 24 is provided at one end of the third conductive rod 26 adjacent to the fourth port 44.
The iron core assembly 50 comprises a primary winding, a secondary winding and an iron core, wherein a second voltage equalizing ball 25 in contact connection with the first voltage equalizing ball 24 is arranged at the high-voltage end of the primary winding, the iron core assembly 50 and a standard voltage transformer in a transformer verification system share an air chamber and a sleeve, and SF6 gas is adopted as an insulating medium in the air chamber.
A first conducting rod 411 is arranged in the first through hole 41, and the first conducting rod 411 is electrically connected with a high-voltage output end of a primary winding of the booster in the transformer verification system; second conducting rod 421 is arranged in second port 42, second conducting rod 421 is electrically connected with the high-voltage output end of the transformer checking system, first conducting rod 411, second conducting rod 421 and third conducting rod 26 are in contact connection through a four-port connecting pipe, and connecting threads for fixing the conducting rods are arranged on the inner surfaces of first port 41 and second port 42.
In order to control the rotation of the driving motor 21, two induction switches are provided on the driving motor 21 for controlling the driving direction and the driving distance of the driving motor 21, wherein the two induction switches are spaced apart by a predetermined distance. Opposite to the induction switch, the transmission rod 22 is provided with two aluminum sheets corresponding to the induction switch, wherein the distance between the two aluminum sheets is equal to the distance between the two induction switches.
The standard voltage transformer on-site self-checking comparison standard provided by the embodiment of the invention further comprises a control panel, and the switch control power supply 10 is electrically connected with the isolating switch 20 through an electric connector on the control panel.
The control panel is also provided with a power control switch, a power lamp, a closing switch, a closing indicator lamp, a separating switch and a separating switch indicator lamp, wherein the power control switch, the closing switch and the separating switch are used for controlling the mutual inductor to be switched in and out of the comparison standard device in the self-checking system. The power supply control switch is a switch with a lamp and a lock; the closing switch and the opening switch are self-resetting switches.
The isolating switch 20 is connected to control a power supply, the closing switch is pressed, the closing indicator lamp is on, the transmission motor 21 rotates, the composite insulator 23 and the third conducting rod 26 are driven to move towards the high-voltage end of the primary winding in the direction of the iron core assembly 50 through the gear and the transmission rod 22 in the transmission motor 21, the iron core assembly 50 is cut into a transformer self-checking system, the standard transformer is compared with the standard transformer serving as a standard transformer of the transformer self-checking system, the original standard voltage transformer is the most tested voltage transformer, and the error of the original standard voltage transformer is measured through the measuring method recommended by JJG314-2010 voltage transformer for measurement, if error data and data measured in a laboratory are compared to meet the requirement of error variation, namely error data out of tolerance caused by the self cause of the voltage transformer error checking system is eliminated.
When the aluminum sheet far away from the transformer checking system is switched by the control circuit of the isolating switch 20 when the inductive switch close to the iron core assembly 50 is closed, the transmission motor 21 stops rotating, when the separating switch is pressed down, the separating switch indicator lights are on, the transmission motor 21 rotates, the composite insulator 23 and the third conducting rod 26 are driven to move towards the direction far away from the high-voltage end of the primary winding of the iron core assembly by the gear and the transmission rod 22, the iron core assembly 50 is disconnected with the transformer self-checking system, when the aluminum sheet close to the iron core assembly 50 is switched again by the control circuit of the isolating switch 20 when the inductive switch far away from the transformer checking system is closed, the transmission motor 21 stops rotating, and therefore connection and disconnection of the iron core assembly 50 and the transformer self-checking system are achieved by controlling the isolating switch 20.
The inductive switch can comprise an infrared inductive switch, and a buffer area is generally formed in a common limit switch, but the position and the force requirements of the comparison standard device cut-in and cut-out loop provided by the embodiment of the invention on the transmission rod 22 to drive the conductive rod to be connected with the comparison standard high-voltage output end are very high, and the use requirements can be met by adopting the infrared inductive switch because the infrared inductive switch reacts rapidly.
Referring to fig. 5, a wiring schematic diagram of a field self-checking system for a standard voltage transformer provided by the embodiment of the invention is shown, and fig. 6 is a wiring schematic diagram of a field self-checking comparison standard for a standard voltage transformer provided by the embodiment of the invention, as shown in fig. 5 and fig. 6, when a tested voltage transformer is checked on a test field and an error out-of-tolerance condition of the tested voltage transformer occurs, the field self-checking comparison standard for the standard voltage transformer provided by the embodiment of the invention is used for eliminating faults.
The standard voltage transformer on-site self-checking comparison standard device provided by the embodiment of the invention comprises a test power supply, an iron core assembly, a test power supply connecting module and an isolating switch, wherein the test power supply is electrically connected with the test power supply connecting module, the isolating switch is electrically connected with a switch control power supply, and after the isolating switch is closed, the test power supply connecting module is fixedly connected with the iron core assembly. According to the embodiment of the invention, the isolation switch is controlled to further control the cut-in and cut-out of the comparison standard device in the mutual inductor self-checking system, so that the standard voltage mutual inductor in the mutual inductor checking system can be directly used as a tested to check and check.
Referring to fig. 7, a flow chart of a standard voltage transformer field self-checking method provided by the embodiment of the invention is shown in fig. 7, and the standard voltage transformer field self-checking method provided by the embodiment of the invention includes:
s10: and checking whether the output of the test power supply in the transformer checking system returns to zero and whether the power supply switch is disconnected.
If the output is zeroed and the power switch is off, then step S20 is performed: and connecting wires to the comparison standard device.
If the output is not zeroed and/or the power supply switch is not opened, step S11 is performed: and (3) returning the output end and/or switching off the power supply switch, and then executing step S20: and connecting wires to the comparison standard device.
S30: connecting an external control power supply and connecting an external power supply control switch;
s40: and switching on a closing switch to enable the high-voltage end of the primary winding of the iron core component of the comparison standard device to be connected with the high-voltage output end of the transformer verification system.
S50: and switching off an external power supply control switch, switching on the power supply switch, regulating the output of the test power supply, slowly boosting to 20% of the primary rated voltage of the standard voltage transformer, and recording test data.
S60: and continuously and slowly boosting to 50% of the primary rated voltage of the standard voltage transformer, and recording test data.
S70: and regulating the output of the test power supply, slowly reducing the voltage to zero, and switching off the power supply switch.
S80, an external power supply control switch is connected, and a brake separating switch is connected, so that the primary high-voltage end of the iron core assembly is disconnected with the high-voltage output end of the transformer checking system.
S90: and switching off a power control switch, and comparing the test data with verification data before delivery of a standard voltage transformer in the transformer verification system.
The on-site self-checking method for the standard voltage transformer provided by the embodiment of the invention is used for the on-site self-checking comparison standard device for the standard voltage transformer provided by the embodiment of the invention. According to the on-site self-checking method for the standard voltage transformer, provided by the embodiment of the invention, the isolation switch is controlled to control the cut-in and cut-out of the comparison standard transformer in the transformer self-checking system, so that the standard voltage transformer in the transformer checking system can be directly used as a tested to carry out checking and checking.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (5)
1. The utility model provides a standard voltage transformer on-the-spot is from calibration and is used standard ware, its characterized in that includes test power supply (30), iron core subassembly (50), test power supply connection module (40) and isolator (20), test power supply (30) with test power supply connection module (40) electricity is connected, isolator (20) electricity is connected switch control power supply (10), after isolator (20) are closed, test power supply connection module (40) with iron core subassembly (50) fixed connection, wherein,
the isolating switch (20) comprises a transmission motor (21), a transmission rod (22), a composite insulator (23), a first voltage-equalizing ball (24), a second voltage-equalizing ball (25) and a third conducting rod (26), one end of the transmission rod (22) is rotationally connected with the transmission motor (21), the other end of the transmission rod (22) is connected with the composite insulator (23), and the other end of the composite insulator (23) is connected with the third conducting rod (26);
the iron core assembly (50) comprises a primary winding, a secondary winding and an iron core, and a second voltage equalizing ball (25) in contact connection with the first voltage equalizing ball (24) is arranged at the high-voltage end of the primary winding;
the transmission motor (21) is provided with two induction switches for controlling the transmission direction and transmission distance of the transmission motor (21), wherein the two induction switches are spaced by a preset distance;
two aluminum sheets corresponding to the induction switches are arranged on the transmission rod (22), wherein the distance between the two aluminum sheets is equal to the distance between the two induction switches;
the test power supply connection module (40) comprises a four-port connection pipe, wherein the four-port connection pipe comprises a first port (41) and a second port (42) which are perpendicular to each other, a third port (43) and a fourth port (44) which are communicated in the same extending direction, and the first port (41) and the second port (42) are perpendicular to the third port (43) and the fourth port (44); the third port (43) is a connection port of the third conducting rod (26), and the fourth port (44) is a connection port of the iron core assembly (50);
a first conducting rod (411) is arranged in the first through hole (41), and the first conducting rod (411) is electrically connected with a high-voltage output end of a primary winding of the booster in the transformer verification system; a second conducting rod (421) is arranged in the second port (42), the second conducting rod (421) is electrically connected with a high-voltage outlet end of the transformer verification system, and the first conducting rod (411), the second conducting rod (421) and the third conducting rod (26) are in contact connection through the four-port connecting piece;
a third conducting rod (26) is arranged in the four-port connecting pipe along the extending direction of the third port (43) and the fourth port (44), and one end of the third conducting rod (26) close to the third port (43) is connected with the transmission rod (22) through the composite insulator (23); a first equalizing ball (24) is arranged at one end of the third conducting rod (26) close to the fourth port (44).
2. The standard voltage transformer field self-verification comparison standard according to claim 1, further comprising a control panel, wherein the switch control power supply (10) is electrically connected to the isolating switch (20) through an electrical connector on the control panel.
3. The comparison standard for the on-site self-calibration of the standard voltage transformer according to claim 2, wherein the control panel is further provided with a power control switch, a power lamp, a closing switch, a closing indicator lamp, a separating switch and a separating indicator lamp, and the power control switch, the closing switch and the separating switch are used for controlling the switching-in and switching-out of the comparison standard in the transformer self-calibration system.
4. The standard voltage transformer field self-checking comparison standard according to claim 3, wherein the power control switch is a switch with a lamp and a lock; the closing switch and the opening switch are self-resetting switches.
5. A method for checking a standard voltage transformer on-site self-checking comparison standard, which is used for the standard voltage transformer on-site self-checking comparison standard according to any one of claims 1 to 4, and is characterized by comprising the following steps:
checking whether the output of a test power supply in the transformer checking system returns to zero or not and whether a power supply switch is disconnected or not;
if the output is returned to zero and the power supply switch is disconnected, the comparison standard device is connected;
if the output is not zeroed and/or the power supply switch is not disconnected, connecting the comparison standard device after zeroing the output and/or disconnecting the power supply switch;
connecting an external control power supply and connecting an external power supply control switch;
switching on a closing switch to enable a high-voltage end of a primary winding of an iron core component of the comparison standard device to be connected with a high-voltage output end of the transformer verification system;
switching off an external power supply control switch, switching on a power supply switch of the transformer verification system, adjusting the input of the test power supply, slowly boosting to 20% of the primary rated voltage of the standard voltage transformer, and recording test data;
continuously and slowly boosting to 50% of the primary rated voltage of the standard voltage transformer, and recording test data;
regulating the output of the test power supply, slowly reducing the voltage to zero, and switching off the power supply switch;
switching on an external power supply control switch and a switching-on and switching-off switch to disconnect a primary high-voltage end of the iron core assembly from a high-voltage output end of the transformer verification system;
and switching off a power control switch, and comparing the test data with verification data before delivery of a standard voltage transformer in the transformer verification system.
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| CN201710597898.9A CN107167759B (en) | 2017-07-20 | 2017-07-20 | Comparison standard device for on-site self-checking of standard voltage transformer and checking method |
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| CN201710597898.9A CN107167759B (en) | 2017-07-20 | 2017-07-20 | Comparison standard device for on-site self-checking of standard voltage transformer and checking method |
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| CN107167759B true CN107167759B (en) | 2024-02-06 |
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