CN118980843A - A high and low temperature error measurement and partial discharge test device for mutual inductor - Google Patents
A high and low temperature error measurement and partial discharge test device for mutual inductor Download PDFInfo
- Publication number
- CN118980843A CN118980843A CN202411465592.4A CN202411465592A CN118980843A CN 118980843 A CN118980843 A CN 118980843A CN 202411465592 A CN202411465592 A CN 202411465592A CN 118980843 A CN118980843 A CN 118980843A
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- transformer
- partial discharge
- shielding box
- low temperature
- error measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
-
- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Power Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
本发明提供了一种互感器的高低温误差测量及局放试验装置，包括屏蔽箱、供电互感器、标准互感器、温控风机、局部放电检测探头；屏蔽箱内为电磁屏蔽的容置空间，供电互感器和标准互感器设置于屏蔽箱外，供电互感器的一次绕组与标准互感器的一次绕组连接，标准互感器的一次绕组与导电杆连接，导电杆通过高压引入孔引入屏蔽箱内，末端设置均压球；温控风机设置于屏蔽箱外，通过风道与风孔连通；受测互感器的一次绕组与均压环连接；屏蔽箱内设置线缆管道，线缆管道为电磁屏蔽材料制成，一端与线缆管道孔连通，控制端设置于屏蔽箱外，与标准互感器连接，并通过线缆管道与局部放电检测探头、被试互感器连接。
The invention provides a high and low temperature error measurement and partial discharge test device of a transformer, comprising a shielding box, a power supply transformer, a standard transformer, a temperature control fan, and a partial discharge detection probe; the shielding box is an accommodating space for electromagnetic shielding, the power supply transformer and the standard transformer are arranged outside the shielding box, the primary winding of the power supply transformer is connected to the primary winding of the standard transformer, the primary winding of the standard transformer is connected to a conductive rod, the conductive rod is introduced into the shielding box through a high-voltage introduction hole, and a voltage-equalizing ball is arranged at the end; the temperature control fan is arranged outside the shielding box and is connected to the wind hole through an air duct; the primary winding of the tested transformer is connected to a voltage-equalizing ring; a cable conduit is arranged in the shielding box, the cable conduit is made of electromagnetic shielding material, one end of the cable conduit is connected to the cable conduit hole, the control end is arranged outside the shielding box, connected to the standard transformer, and connected to the partial discharge detection probe and the tested transformer through the cable conduit.
Description
Technical Field
The invention belongs to the technical field of transformer testing, and particularly relates to a high-low temperature error measurement and partial discharge test device of a transformer.
Background
The metering device consisting of the 10 kV-35 kV metering transformer and the electric energy meter is used for an electric energy metering scene, and the accuracy of the metering device is directly related to whether trade settlement of power generation, power distribution, power supply and power utilization parties is fair and fair. In particular, such transformers are widely used in distribution networks, the metering performance of which affects the trade settlement of the electric quantity between the network and the users, and the reliability of operation of which is directly related to the electricity safety of the network.
The transformer for 10 kV-35 kV measurement has the characteristics of wide application range, large purchase quantity, various models and the like, but the current transformer used in a power distribution network circuit has uneven quality, higher failure rate and frequent phenomena of explosion or combustion and the like. In order to solve the problem, not only the running transformer needs to be strictly detected, but also the full-performance detection of the transformer needs to be carried out before network entry.
At present, a plurality of manufacturers participating in bidding of the transformer for 10 kV-35 kV metering at home have uneven technical capability and quality level, and the workload of sampling all-performance detection of products of various manufacturers is huge. The existing partial discharge and limit temperature error test equipment is dispersed, the construction cost is high, the occupied area is large, the test efficiency is low, and a plurality of inconveniences are brought to the full-performance detection work of the transformer. For partial discharge testing, it is generally necessary to construct a special room for partial discharge testing having electromagnetic shielding performance, and transfer the transformer to be tested into the special room for testing. And after the test is finished, if the high-low temperature error test is needed, the transformer is transferred into a high-low temperature test box for test.
In order to ensure the accuracy of detection and improve the efficiency, it is necessary to construct a set of full-performance detection equipment for the measuring transformer, which has high integration level, high test efficiency and high automation degree, so as to comprehensively detect the measuring performance and the insulating performance of the transformer, improve the test efficiency and reduce the labor intensity.
Disclosure of Invention
Based on the above-mentioned drawbacks and deficiencies of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, or to provide a high and low temperature error measurement and partial discharge test device for a transformer meeting one or more of the above-mentioned needs.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides a high-low temperature error measurement and partial discharge test device of a transformer,
The device comprises a shielding box, a power supply transformer, a standard transformer, a temperature control fan, a control end and a partial discharge detection probe;
The shielding box is internally provided with an electromagnetic shielding accommodating space, and the wall of the shielding box is provided with a high-pressure leading-in hole, a wind hole and a cable pipeline hole; the power supply transformer and the standard transformer are arranged outside the shielding box, the secondary winding of the power supply transformer is connected with a power supply, the primary winding of the power supply transformer is connected with the primary winding of the standard transformer, the primary winding of the standard transformer is connected with the conducting rod, the conducting rod is introduced into the shielding box through the high-voltage introducing hole, and the tail end of the conducting rod is provided with a voltage equalizing ball;
the temperature control fan is arranged outside the shielding box and communicated with the air hole through an air channel, and the air channel is made of electromagnetic shielding materials;
the partial discharge detection probe and the tested transformer are arranged in the shielding box, and a primary winding of the tested transformer is connected with the voltage equalizing ball;
the cable pipeline is arranged in the shielding box, is made of electromagnetic shielding materials, one end of the cable pipeline is communicated with the cable pipeline hole, and the control end of the cable pipeline is arranged outside the shielding box and connected with the standard transformer and the partial discharge detection probe and the tested transformer through the cable pipeline.
As a preferred embodiment, a partition plate is arranged in the shielding box, the accommodating space in the shielding box is partitioned into a pipeline layer and a test layer by the partition plate, and the cable pipeline is arranged on the pipeline layer and is communicated to the test layer through the partition plate.
As a preferred embodiment, the air duct and the cable duct are configured as multi-section bends, reducing electromagnetic radiation entering the shielding cage through the air duct and the cable duct.
As a preferred embodiment, the length to diameter ratio of the cable duct is greater than 30:1.
As a preferred embodiment, the conducting rod is sleeved with an insulating sleeve, and sulfur hexafluoride gas is injected into the insulating sleeve.
As a preferred embodiment, the standard transformer is sleeved in the GIL pipeline, and the GIL pipeline is fixedly connected with the shielding box through a flange.
As a preferred embodiment, the air duct is provided with an insulating layer.
As a preferred embodiment, the shielding box is provided with a box door.
As a preferred embodiment, the door is made of an electromagnetic shielding material.
Compared with the prior art, the invention has the beneficial effects that:
The high-low temperature error measurement and partial discharge test device of the transformer leads the high-voltage power to the standard transformer through the power supply transformer, and leads the high-voltage power to the box body through the conductive rod, and supplies power without partial discharge to the tested transformer in the box body, thereby eliminating the influence of other partial discharge except the tested transformer in the shielding box, leading the high-voltage end through the conductive rod, surrounding the wiring part by using the cable pipeline, reducing background noise leaked into the shielding box from the outside, and improving the monitoring precision of the partial discharge test. Meanwhile, when the measured transformer performs high and low temperature error measurement, the device directly creates a high and low temperature environment in the box body, and uses the standard transformer as the comparison of error measurement, so that the measured transformer does not need to be moved between an electromagnetic shielding room special for partial discharge measurement and a room for high and low temperature measurement when two kinds of measurement are performed.
Drawings
Fig. 1 is a schematic structural diagram of a high-low temperature error measurement and partial discharge test device of a transformer according to an embodiment of the present invention;
FIG. 2 is a schematic view of the top of a shielding cage according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of a shielding cage according to an embodiment of the present invention;
fig. 4 is a schematic view of a shield can of an embodiment of the present invention divided by a partition.
Reference numerals:
1-shielding box, 101-box door, 102-high voltage leading-in hole, 103-cable pipeline hole, 104-baffle, 105-wind hole, 2-power supply transformer, 3-standard transformer, 4-temperature control fan, 401-wind channel, 5-control end, 6-GIL pipeline, 601-flange, 7-conducting rod, 701-voltage equalizing ball, 8-cable pipeline, 9-partial discharge detection probe and 10-tested transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following description is provided with reference to the accompanying drawings to assist in the understanding of the exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details that aid in understanding, but they are to be considered exemplary only. Accordingly, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. Moreover, a detailed description of functions and configurations well known in the art will be omitted for the sake of clarity and conciseness of the present specification.
The invention relates to a high-low temperature error measurement and partial discharge test device of a transformer, which is shown in fig. 1 and 2, and comprises a shielding box 1, a power supply transformer 2, a standard transformer 3, a temperature control fan 4 for adjusting the temperature in the shielding box and a control end 5 for supplying power to each component, controlling and receiving test results. The standard transformer 3 is a transformer which is tested, has no partial discharge and has an error within a standard range.
The box body of the shielding box 1 is made of electromagnetic shielding materials, so that the accommodating space inside the box body is electromagnetically shielded outside the box body, and the box door 101 which is also made of the electromagnetic shielding materials is arranged on the front surface of the shielding box, so that the equipment in the box can be conveniently placed and installed.
Referring to fig. 3 for a schematic structural diagram of the top of the shielding case 1, a GIL pipe 6 is disposed above the shielding case 1, and the GIL pipe 6 is fixedly connected to the top wall of the shielding case 1 from outside, and a flange 601 is used as a connecting member. A circular hole is opened in the top wall of the shield case 1 as a high-pressure introduction hole 102 provided at the center of the flange 601. The power supply transformer 2 and the standard transformer 3 are disposed in the GIL tube 6, fixed inside the GIL tube, and the primary winding portion of the power supply transformer 2 and the primary winding portion of the standard transformer 3 are connected inside the GIL tube using conductive cables.
The secondary winding part of the power supply transformer 2 exposes a power interface outside the GIL tube 6 and is electrically connected with the control end 5, and the control end 5 supplies power to the secondary winding of the power supply transformer 2, so that high voltage is generated on the primary winding of the power supply transformer 2 in a mutual inductance mode.
In the standard transformer 3, the primary winding portion thereof is electrically connected to the primary winding portion of the power supply transformer 2 and to the conductive rod 7, and the conductive rod 7 protrudes downward through the high voltage introduction hole 102 to the inside of the shield case 1. Inside the shielding box 1, the ends of the conducting rods 7 are provided with voltage equalizing balls 701.
The structure leads the high voltage on the primary winding of the power supply transformer into the shielding case 1 through the standard transformer 3 and the conducting rod 7 under the electromagnetic shielding state in the shielding case 1, and the voltage-sharing ball 701 at the tail end of the conducting rod 7 is used as a high voltage leading-out point for the tested transformer 10 arranged in the shielding case 1 to be connected with the high voltage.
The high voltage led to the standard transformer 3 through the power supply transformer 2 and led to the voltage equalizing ball 701 through the standard transformer 3 and the conducting rod 7 does not generate partial discharge, so that the partial discharge generated by directly leading the high voltage of the power supply into the shielding box 1 is prevented from interfering with the partial discharge test of the tested transformer 10.
The insulating sleeve is sleeved on the conducting rod 7, sulfur hexafluoride gas is injected into the insulating sleeve, the rod body part of the conducting rod 7 is electrically insulated, and the voltage equalizing ball 701 is exposed at the tail end of the insulating sleeve to supply power to the tested transformer 10 arranged in the shielding box 1.
Referring to fig. 2, the cable tube 8 is disposed inside the shielding case 1, a circular hole is formed at the bottom of the sidewall of the shielding case 1 as a cable tube hole 103, the cable tube 8 is communicated with the outside of the case through the cable tube hole 103, and the cable tube 8 is made of an electromagnetic shielding material.
The partial discharge monitoring probe 9 is arranged inside the shielding case 1 and is placed towards the transformer to be tested. The wiring of the partial discharge monitoring probe 9 extends into the cable duct 8, extends out of the box through the cable duct 8 and the cable duct hole 103, and the wiring of the tested transformer also extends out through the cable duct 8 and the cable duct hole 103.
The cable duct 8 with electromagnetic shielding performance is installed behind the cable duct hole 103 in the above structure, so that a small amount of background noise entering through the cable duct hole 103 is shielded by the duct wall of the cable duct 8, and further, the background noise leaking into the shielding case 1 along with the wiring of the equipment in the case is reduced.
In order to improve electromagnetic shielding performance and further reduce background noise leaking into the shielding box 1 through the cable duct 8, the device of the embodiment performs multi-section bending on the cable duct 8, and the length-to-diameter ratio of the cable duct 8 is greater than 30:1, thereby the background noise entering through the cable duct hole 103 is better shielded by the duct wall of the cable duct 8, and the electromagnetic shielding performance of the whole shielding box 1 is further improved.
Referring to fig. 2 and 4, in this embodiment, a transverse partition board 104 is further disposed in the shielding case 1, the partition board 104 divides the shielding case into an upper layer and a lower layer, the upper layer is a test layer for placing the partial discharge monitoring probe 9 and the tested transformer 10, and the lower layer is a pipeline layer for accommodating the cable pipeline 8. The partition 104 is provided with an opening to allow the cable duct 7 to pass through from the duct layer to the test layer, the box door 101 is provided on the side wall of the test layer, and the cable duct hole 103 is provided on the side wall of the duct layer. The partition 104 is also made of electromagnetic shielding material, separates the tested transformer 10 and the cable duct hole 103 into a test layer and a duct layer, and reduces the influence of background noise entering through the cable duct hole 103 on partial discharge monitoring. After the structural design, the electromagnetic shielding effect of the box body should reach the level of 150kHz-1.6MHz more than or equal to 60dB, and the background noise is less than 5.0pC.
The temperature control fan 4 is arranged outside the shielding box 1 and is communicated with the shielding box 1 through an air duct 401. The air duct 401 is made of an electromagnetic shielding material, reducing background noise entering the shielding box 1. The side of the shielding box 1 is provided with an air hole 105, the tail end of the air duct 401 is communicated with the air hole 105, and the temperature control fan 4 blows cold and hot air into the shielding box 1 through the air duct 401 to control the temperature in the shielding box 1.
The air duct 401 is also wrapped with an insulating layer, so that heat dissipation with the outside is reduced, and the temperature control performance of the temperature control fan 4 on the shielding box 1 is improved.
In this embodiment, the air duct 401 is further bent in multiple sections, so that background noise leaking into the shielding case 1 through the air duct 401 and the air hole 105 is better shielded, and the overall electromagnetic shielding performance of the shielding case 1 is further improved.
The control end 5 is connected with the power supply transformer 2, the standard transformer 3 and the temperature control fan 4 and is connected with the partial discharge monitoring probe 9 and the tested transformer 10 through the wiring arranged on the cable pipeline 8, so that power and control signals are provided for the power supply transformer 2, the standard transformer 3 and the temperature control fan 4, and monitoring signals returned by the standard transformer 3, the partial discharge monitoring probe 9 and the tested transformer 10 are received.
When the tested transformer 10 is subjected to partial discharge test, the device of the embodiment provides power for the power supply transformer 2 through the control end 5, the power supply transformer 2 is connected with the standard transformer 3 through high voltage generated by mutual inductance, and the power supply transformer 2 is introduced into the shielding box 1 along with the conducting rod 7, so that a high voltage access point without partial discharge is formed on the voltage equalizing ball 701. The tested transformer 10 is connected with the voltage equalizing ball 701, the high-voltage power supply of the tested transformer 10 is connected, and partial discharge is not generated in the shielding box 1 in the connection process.
In the working engineering of the tested transformer 10, the partial discharge detection probe 9 monitors partial discharge signals around the tested transformer 10 and sends the monitoring signals to the control end 5 through wiring.
When the high-low temperature error measurement is carried out on the tested transformer 10, the device of the embodiment sends a control signal to the temperature control fan 4 through the control end 5, and the temperature control fan 4 controls the temperature in the shielding box 1, so that the temperature is changed between-40 ℃ and +70 ℃ according to the test requirement. The tested transformer 10 is connected to a power supply from the voltage equalizing ball 701, so that the same high-voltage power supply is introduced into the primary winding parts of the standard transformer 3 and the tested transformer 10, parameter signals of the working states of the standard transformer 3 and the tested transformer 10 are sent to the control end 5, the control end 5 respectively collects the parameter signals on the secondary windings of the standard transformer 3 and the tested transformer 10, and the parameter signals of the standard transformer 3 and the tested transformer 10 are compared to measure the error of the tested transformer 10.
When the device of the embodiment is used for carrying out partial discharge test on the tested transformer, a power supply is led to the standard transformer through the power supply transformer and then led into the box body through the conducting rod, and partial discharge-free power supply is carried out on the tested transformer in the box body, so that the accuracy of partial discharge test is improved; and when the measured transformer performs high and low temperature error measurement, a high and low temperature environment is directly created in the shielding box, and then a standard transformer is used as the comparison of error measurement, so that the measured transformer does not need to be moved between an electromagnetic shielding room special for partial discharge measurement and a room for high and low temperature measurement when two kinds of measurement are performed.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411465592.4A CN118980843A (en) | 2024-10-21 | 2024-10-21 | A high and low temperature error measurement and partial discharge test device for mutual inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411465592.4A CN118980843A (en) | 2024-10-21 | 2024-10-21 | A high and low temperature error measurement and partial discharge test device for mutual inductor |
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| CN118980843A true CN118980843A (en) | 2024-11-19 |
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