CN215575335U - Lightning arrester direct current reference voltage testing arrangement - Google Patents
Lightning arrester direct current reference voltage testing arrangement Download PDFInfo
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- CN215575335U CN215575335U CN202121655077.4U CN202121655077U CN215575335U CN 215575335 U CN215575335 U CN 215575335U CN 202121655077 U CN202121655077 U CN 202121655077U CN 215575335 U CN215575335 U CN 215575335U
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Abstract
The utility model provides a direct-current reference voltage testing device for an arrester, which comprises an alternating-current power supply control box, a testing chamber, a high-voltage direct-current generator and a capacitor, wherein the testing chamber is used for accommodating the arrester to be tested, a temperature adjusting device and a humidity adjusting device are arranged in the testing chamber, and a temperature and humidity sensor is also arranged in the testing chamber; the alternating current power supply control box comprises an alternating current power supply, a rectifying circuit, an inverter circuit and a step-up transformer which are sequentially connected, the step-up transformer is connected with a high-voltage direct current generator, the high-voltage direct current generator is connected with a capacitor, the capacitor is connected with a lightning arrester to be tested, and the output voltage of the step-up transformer is adjustable; the method has higher accuracy for testing the direct current reference voltage of the lightning arrester, effectively reduces errors caused by complex environment and non-standard operation, and improves the testing efficiency of the direct current reference voltage of the lightning arrester.
Description
Technical Field
The utility model belongs to the technical field of testing devices, and particularly relates to a lightning arrester direct-current reference voltage testing device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The rail transit plays an increasingly important role in social economy, and as the zinc oxide lightning arrester has the advantages of good nonlinearity, good protection selectivity, large current capacity, simple structure, high reliability and the like, the zinc oxide lightning arrester can quickly act to prevent equipment from being interfered when suffering from operation overvoltage and lightning overvoltage, and most of rail transit vehicles adopt a mode of mounting the zinc oxide lightning arrester on the roof to prevent the threat caused by the fact that lightning waves invade a high-voltage system of a motor train unit.
According to the certainty method of the insulation fit, the insulation level of the protected equipment of the high-voltage system of the rail transit vehicle is mainly selected according to the protection level of the vehicle-mounted lightning arrester. The vehicle-mounted lightning arrester is used as an element for restraining split-phase overvoltage and lightning overvoltage transmitted by a contact network, and the overvoltage can be limited in a short time by utilizing the good nonlinear volt-ampere characteristic of the valve plate. Because the currently adopted vehicle-mounted zinc oxide arrester mostly has no gap, the zinc oxide piezoresistor bears power frequency voltage for a long time, current always flows through the valve plate during the operation, in addition, the train is influenced by factors such as frequent vibration, rainy and snowy bad weather, split-phase overvoltage, lightning overvoltage impact and the like for a long time during the operation process, the vehicle-mounted arrester can be affected with damp and aging under the combined action of electric heat, vibration and humidity, so that the resistive leakage current component flowing through the vehicle-mounted arrester is continuously increased and the power loss is intensified, the temperature of the zinc oxide valve plate of the vehicle-mounted arrester is increased until thermal breakdown occurs, the vehicle-mounted arrester is deteriorated and disabled, and the safe operation of the train is influenced. The direct current reference voltage of the arrester is a main criterion of aging and deterioration of the arrester, and the arrester with aging and deterioration faults can be found in time by measuring the direct current reference voltage of the arrester in routine maintenance, so that the occurrence of safety accidents of the arrester is avoided, and the safe and stable running of a train is ensured.
The traditional lightning arrester direct current reference voltage testing method is complicated, the measurement precision is low, the direct current reference voltage testing method can be influenced by external environment factors, results obtained by different pressurizing methods are often different, and the testing result is not accurate.
Disclosure of Invention
The lightning arrester direct current reference voltage testing device has high accuracy for testing the lightning arrester direct current reference voltage, effectively reduces errors caused by complex environment and non-standard operation, and improves the lightning arrester direct current reference voltage testing efficiency.
According to some embodiments, the utility model adopts the following technical scheme:
the utility model provides a lightning arrester direct current reference voltage testing arrangement, includes alternating current power supply control box, test chamber, high voltage direct current generator and condenser, wherein:
the testing chamber is used for accommodating the lightning arrester to be tested, a temperature adjusting device and a humidity adjusting device are arranged in the testing chamber, and a temperature and humidity sensor is further arranged in the testing chamber;
the high-voltage direct-current power supply control box comprises an alternating-current power supply, a rectifying circuit, an inverter circuit and a step-up transformer which are sequentially connected, wherein the step-up transformer is connected with a high-voltage direct-current generator, the high-voltage direct-current generator is connected with a capacitor, the capacitor is connected with a lightning arrester to be detected, and the output voltage of the step-up transformer is adjustable.
Through above-mentioned technical scheme, can control the environment humiture of the arrester that awaits measuring, guarantee when confirming arrester direct current reference voltage, keep test environment uniformity as far as, reduce the influence of environment humiture, and can adjust the pressure range, guarantee the standardization of test procedure.
In an alternative embodiment, the testing chamber comprises a housing, the housing is provided with a through hole for accommodating the connecting wire, and an opening, and the opening is provided with an openable cover body. So as to facilitate the installation or placement of the temperature adjusting device, the humidity adjusting device, the temperature and humidity sensor and the lightning arrester to be tested.
As an alternative embodiment, the capacitor is connected to the high-voltage side of the lightning arrester to be tested by a connecting line.
In an alternative embodiment, the boosting transformer and the high voltage dc generator, and the high voltage dc generator and the capacitor are connected by a connecting line.
By way of further limitation, the connecting lines are all shielded cables.
As an alternative embodiment, an adjustable switch is arranged outside the alternating current power supply control box, and the adjustable switch is used for adjusting the output voltage of the boosting transformer.
In an alternative embodiment, the rectification circuit and the inverter circuit are both bridge circuits.
In an alternative embodiment, the high-voltage dc generator is further connected to a discharge element.
As an alternative embodiment, the step-up transformer is connected with a voltage detection module and a current detection module, and a display unit is arranged on the alternating current power supply control box to display the detection values of the voltage detection module and the current detection module.
In an alternative embodiment, an alarm is arranged in the test chamber and used for giving an alarm when the temperature/humidity detection value of the temperature and humidity sensor exceeds a set value.
As an alternative embodiment, a controller is arranged in the test chamber, and the controller is connected with a temperature adjusting device, a humidity adjusting device and a temperature and humidity sensor.
Compared with the prior art, the utility model has the beneficial effects that:
the temperature and humidity control device can control the environment temperature and humidity of the lightning arrester to be tested, ensures that the consistency of the test environment is kept as much as possible when the direct current reference voltage of the lightning arrester is determined, reduces the influence of the environment temperature and humidity, can accurately control the temperature and humidity in the control box through the temperature and humidity sensor, and can give an alarm through the timing audio alarm device when the temperature and humidity are too high.
The utility model can gradually adjust the pressurization amplitude, ensures the normalization of the test process, has higher accuracy for the test of the lightning arrester direct current reference voltage, effectively reduces the errors caused by complex environment and non-standard operation, and improves the test efficiency of the lightning arrester direct current reference voltage.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
Fig. 1 is a structural diagram of a lightning arrester direct current reference voltage testing device of the utility model;
fig. 2 is a schematic diagram of a lightning arrester dc reference voltage testing device of the utility model;
FIG. 3(a) is a schematic diagram of a rectifier circuit of the present invention;
FIG. 3(b) is a structural view of an inverter circuit of the present invention;
FIG. 4 is a schematic diagram of the temperature and humidity control logic of the present invention;
wherein: 1. the device comprises a discharge rod, 2, a test chamber, 3, a temperature and humidity sensor, 4, a temperature alarm lamp, 5, a humidity alarm lamp, 6, a lightning arrester to be tested, 7, a capacitor, 8, a high-voltage direct-current generator, 9, an alternating-current power supply control box, 10, a first adjusting button, 11 and a second adjusting button.
The specific implementation mode is as follows:
the utility model is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As shown in fig. 1, a lightning arrester dc reference voltage testing device includes an ac power control box 9, a testing chamber 2, a high voltage dc generator 8 and a capacitor 7, wherein:
the testing chamber 2 is used for accommodating a lightning arrester 6 to be tested, a temperature adjusting device and a humidity adjusting device are arranged in the testing chamber 2, and a temperature and humidity sensor 3 is further arranged in the testing chamber;
the alternating current power supply control box 9 comprises an alternating current power supply, a rectifying circuit, an inverter circuit and a step-up transformer which are sequentially connected, the step-up transformer is connected with a high-voltage direct current generator 8, the high-voltage direct current generator 8 is connected with a capacitor 7, the capacitor 7 is connected with a lightning arrester to be tested, and the output voltage of the step-up transformer is adjustable.
As shown in fig. 2, the AC power supply control box 9 (AC 220 control box in the present embodiment), the high voltage dc generator 8 are connected to the AC220 control box and the capacitor 7; the capacitor 7 is connected with the high-voltage direct-current generator 8 and the high-voltage end of the lightning arrester test article, so that the direct-current voltage fluctuation is reduced; the voltage and current display device is arranged on a display screen of the AC220 control box.
The temperature and humidity sensor 3 is connected with the controller. The controller is connected with a temperature alarm lamp 4 and a humidity alarm lamp 5.
In this embodiment, the AC220 control box, the high voltage dc generator 8, the capacitor 7, and the lightning arrester connection cable are all shielded cables.
The test chamber comprises a shell, wherein a through hole used for accommodating the connecting wire and an opening are formed in the shell, and an openable cover body is arranged on the opening. So as to place the lightning arrester to be tested.
Before the test, the controller is adjusted to select the required temperature and humidity, then a power switch of an alternating current power supply control box 9 is turned on, a 'high-voltage on' button is pressed, a first adjusting button 10 is rotated to carry out rough adjustment, an adjusting knob is uniformly boosted, leakage current is strictly monitored during boosting, when 1mA is reached, a second adjusting button 11 is rotated to carry out fine adjustment, a fine adjusting knob is slowly adjusted to stop boosting when the leakage current reaches 1mA, a voltage value under 1mA is read after reading of an ammeter is stable, and a leakage current value under the voltage is read by pressing a '0.75 DC1 mA' button.
Turning the knob of the voltage regulator to zero position, pressing the high voltage off button to turn off the power switch of the instrument, and pulling the power knife switch. The discharge rod 1 is connected to the discharge of the test object and, if necessary, to objects that are not grounded. When the temperature and the humidity in the control box exceed the current threshold value, the temperature alarm lamp 4 or the humidity alarm lamp 5 starts to alarm.
In this embodiment, the rectifying circuit is a circuit as shown in FIG. 3(a), and a DC voltage U is setdConstant, the circuit works in SPWM mode. u. ofN(t)，LNThe polarities (directions) of the voltage and the current in the branch circuits can be as follows: VI1，VI3Conducting the current from VI1Flow direction VI3At this time, the voltage and the current are both positive; VD1，VD3Conducting current from VD3Flow direction VD1At this time, the voltage is positive and the current is negative; VI2，VI4Conducting the current from VI2Flow direction VI4At this time, the voltage and the current are both negative; VD2，VD4Conducting current from VD4Flow direction VD2At this time, the voltage is negative and the current is positive.
Inverter circuit in the circuit shown in FIG. 3(b), when switch VI is on1，VI3Conduction, VI2，VI4At disconnection, u0Is positive; when switch VI2，VI4Conduction, VI1，VI3At disconnection, u0Is negative. Inverter output voltage u0Is alternating current. The frequency of the output alternating current can be changed by changing the switching frequency of the two groups of switches. When the load is of resistive-inductive nature, switch VI is assumed2，VI4Before conduction, the load voltage and current are both positive, so when switch VI is turned on2，VI4Conduction, VI1，VI 3When switched off, the polarity of the load voltage immediately becomes negative. Due to the inductance in the load, the current cannot change immediately and still maintain the original direction. At this time, the load current will passVD2DC power supply and VD3And circulating, feeding back the stored energy in the load to the power supply, reducing the load current, and reversing and gradually increasing the load current after the load current is zero.
As shown in fig. 4, in the testing process, when the dc reference voltage temperature and humidity control of the lightning arrester is performed, the temperature (humidity) is initialized, the current temperature (humidity) and the set temperature (humidity) are sent to be displayed, and if the current temperature (humidity) is less than the set temperature (humidity), the heater (humidity) works at this time, and the temperature initialization operation is repeated; when the current temperature (humidity) is equal to the set temperature (humidity), the measurement test is started. If the current temperature (humidity) is higher than the upper limit of the set temperature (humidity), alarming and turning on a red (yellow) lamp; if the current temperature (humidity) is less than the upper limit of the set temperature (humidity), the cooling (dehumidifying) function is started, and the operation is repeated.
This embodiment passes through the humiture in temperature and humidity sensor 3 can accurate control box, but also can report to the police through regularly audible alarm device when the humiture is too high.
The problems of non-standardization and environmental interference in the lightning arrester direct current reference voltage test are solved through the constructed direct current reference voltage test device and the standardized pressurization process; the method has higher accuracy for testing the direct current reference voltage of the lightning arrester, effectively reduces errors caused by complex environment and non-standard operation, and improves the testing efficiency of the direct current reference voltage of the lightning arrester.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. The utility model provides a lightning arrester direct current reference voltage testing arrangement which characterized by: including alternating current power supply control box, test chamber, high voltage direct current generator and condenser, wherein:
the testing chamber is used for accommodating the lightning arrester to be tested, a temperature adjusting device and a humidity adjusting device are arranged in the testing chamber, and a temperature and humidity sensor is further arranged in the testing chamber;
the high-voltage direct-current power supply control box comprises an alternating-current power supply, a rectifying circuit, an inverter circuit and a step-up transformer which are sequentially connected, wherein the step-up transformer is connected with a high-voltage direct-current generator, the high-voltage direct-current generator is connected with a capacitor, the capacitor is connected with a lightning arrester to be detected, and the output voltage of the step-up transformer is adjustable.
2. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the testing chamber comprises a shell, wherein a through hole used for accommodating the connecting wire and an opening are formed in the shell, and an openable cover body is arranged on the opening.
3. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: and the capacitor is connected with the high-voltage side of the lightning arrester to be tested through a connecting wire.
4. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the boosting transformer is connected with the high-voltage direct-current generator, and the high-voltage direct-current generator is connected with the capacitor through connecting wires.
5. The lightning arrester direct current reference voltage testing device according to claim 3 or 4, characterized in that: the connecting lines are all shielded cables.
6. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: an adjustable switch is arranged outside the alternating current power supply control box and used for adjusting the output voltage of the boosting transformer.
7. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the rectification circuit and the inverter circuit are both bridge circuits.
8. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the high-voltage direct current generator is also connected with a discharge element.
9. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the step-up transformer is connected with a voltage detection module and a current detection module, and a display unit is arranged on the alternating current power supply control box to display the detection values of the voltage detection module and the current detection module.
10. The lightning arrester direct-current reference voltage testing device according to claim 1, characterized in that: the temperature/humidity detection value of the temperature and humidity sensor exceeds a set value;
or, a controller is arranged in the test chamber, and the controller is connected with a temperature adjusting device, a humidity adjusting device and a temperature and humidity sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121655077.4U CN215575335U (en) | 2021-07-20 | 2021-07-20 | Lightning arrester direct current reference voltage testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121655077.4U CN215575335U (en) | 2021-07-20 | 2021-07-20 | Lightning arrester direct current reference voltage testing arrangement |
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| Publication Number | Publication Date |
|---|---|
| CN215575335U true CN215575335U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121655077.4U Active CN215575335U (en) | 2021-07-20 | 2021-07-20 | Lightning arrester direct current reference voltage testing arrangement |
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2021
- 2021-07-20 CN CN202121655077.4U patent/CN215575335U/en active Active
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