CN109239502B - Surge protector testing arrangement - Google Patents
Surge protector testing arrangement Download PDFInfo
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- CN109239502B CN109239502B CN201811388048.9A CN201811388048A CN109239502B CN 109239502 B CN109239502 B CN 109239502B CN 201811388048 A CN201811388048 A CN 201811388048A CN 109239502 B CN109239502 B CN 109239502B
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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
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Abstract
The invention discloses a surge protector testing device which comprises a voltage regulating module, a rectifying module, a filtering module, a testing switch module, a display module and a direct current surge protector, wherein the input end of the voltage regulating module is connected to an alternating current power supply, and the output end of the voltage regulating module, the rectifying module, the filtering module and the testing switch module are sequentially connected; the test switch module comprises a first positive output end and a first negative output end, the first positive output end of the test switch module is connected with the power input end of the direct current surge protector, and the grounding end of the direct current surge protector is connected with the first negative output end of the test switch module through the display module. The embodiment of the invention tests the direct current surge protector by providing the direct current short-circuit current, and can comprehensively observe the test process and the test result of the direct current surge protector, thereby improving the reliability of the test of the direct current surge protector.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a surge protector testing device.
Background
The surge protector (Surge Protective Device, SPD), also called lightning protector, is an electronic device that provides safety protection for various electronic equipment, instrumentation and communication lines. When a peak current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the surge protector can conduct shunt in a very short time, so that damage of the surge to other equipment in the loop is avoided. The decoupler and voltage limiting element in the SPD are the most central two components, the reliability and safety of their operation directly affect the protective performance and capabilities of the SPD and even the overall lightning protection system.
Because the SPD inevitably has short circuit fault in the use process, in addition, the core element piezoresistor of the voltage limiting type SPD can be aged, and in order to prevent accidents such as fire and the like caused by short circuit current or overload current flowing through the SPD under the failure or damage low-resistance mode of the SPD, a disconnector is adopted to disconnect the SPD from a power supply system when the SPD has short circuit failure, so that the thermal protection function and the overcurrent protection function are realized.
In GB18802.1-2012, IEC61643-1, U L1449 and other standard standards, the short-circuit current tolerance capability is a test for the safety breaking capability of a disengager of an SPD. The voltage limiting element in the SPD is generally short-circuited by a copper bar before the test is carried out, and the SPD is effectively and permanently disconnected under certain short-circuit current, so that sparks and even explosions cannot occur. The current mode for testing the direct current surge protector is the same as the mode for testing the alternating current surge protector, and a certain alternating current short-circuit current is provided for testing, and because in the alternating current circuit, the electric arc disappears when the alternating current passes through zero instantaneously, the testing process and the testing result of the direct current surge protector cannot be comprehensively observed, and the testing reliability of the direct current surge protector is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the surge protector testing device which can comprehensively observe the testing process and the testing result of the direct current surge protector, thereby improving the reliability of the direct current surge protector test.
In order to solve the technical problems, the invention provides a surge protector testing device, which comprises a voltage regulating module, a rectifying module, a filtering module, a testing switch module, a display module and a surge protector, wherein the input end of the voltage regulating module is connected to an alternating current power supply, and the output end of the voltage regulating module, the rectifying module, the filtering module and the testing switch module are sequentially connected;
the test switch module comprises a first positive output end and a first negative output end, the first positive output end of the test switch module is connected with the power input end of the surge protector, and the grounding end of the surge protector is connected with the first negative output end of the test switch module through the display module.
Further, the surge protector testing device further comprises an overload protection module, wherein the input end of the overload protection module is connected to the alternating current power supply, and the output end of the overload protection module is connected with the input end of the voltage regulating module.
Further, the voltage regulating module further comprises N voltage regulating transformers, the input end of the voltage regulating module comprises a first input end and a second input end, and the output end of the voltage regulating module comprises a first output end and a second output end;
the primary windings of the N voltage regulating transformers are connected in parallel and then connected with the first input end and the second input end of the voltage regulating module in a bridging mode, and the secondary windings of the N voltage regulating transformers are connected in series and then connected with the first output end and the second output end of the voltage regulating module in a bridging mode.
Further, n=8.
Further, the test switch module further comprises a second positive output end and a second negative output end, and the second positive output end and the second negative output end of the test switch module are respectively and correspondingly connected with the first output end and the second output end of the voltage regulating module.
Further, the rectifying module is a bridge rectifying circuit, the bridge rectifying circuit comprises a positive input end, a negative input end, a positive output end and a negative output end, and the positive input end and the negative input end of the bridge rectifying circuit are respectively and correspondingly connected with the first output end and the second output end of the voltage regulating module.
Further, the filtering module comprises a first capacitor, a first end of the first capacitor is connected with the positive output end of the bridge rectifier circuit, and a second end of the first capacitor is connected with the negative output end of the bridge rectifier circuit.
Further, the filtering module further comprises a second capacitor, and the second capacitor is connected with the first capacitor in parallel.
Further, the test switch module further comprises a positive input end, a negative input end and a linkage switch, wherein the positive input end of the test switch module is connected with the first end of the first capacitor, and the negative input end of the test switch module is connected with the second end of the first capacitor;
the linkage switch comprises a first movable contact, a second movable contact, a first fixed contact, a second fixed contact, a third fixed contact and a fourth fixed contact, wherein the first movable contact is the positive input end of the test switch module, the second movable contact is the negative input end of the test switch module, the first fixed contact is the first positive output end of the test switch module, the second fixed contact is the first negative output end of the test switch module, the third fixed contact is the second positive output end of the test switch module, and the fourth fixed contact is the second negative output end of the test switch module.
Further, the display module comprises an ammeter and a shunt;
the first end of the current divider is connected with the grounding end of the surge protector, the second end of the current divider is connected with the first negative output end of the test switch module, and the ammeter is connected with the current divider in parallel.
When the surge protector testing device is used for testing, the first positive output end and the first negative output end of the testing switch module are conducted, the alternating current voltage received by the input end of the testing switch module is regulated through the voltage regulating module to obtain alternating current testing voltage meeting the required voltage value, the alternating current testing voltage is sent to the rectifying module for rectifying treatment, the rectifying module sends the rectified direct current testing voltage to the filtering module, the filtering module carries out filtering treatment on the direct current testing voltage, and more gentle direct current testing current is provided for the direct current surge protector through the testing switch module, the display module carries out real-time monitoring and display on the current flowing through the direct current surge protector, and the direct current surge protector is tested through the provision of direct current short-circuit current, so that the testing process and the testing result of the direct current surge protector can be comprehensively observed, and the testing reliability of the direct current surge protector is improved.
Drawings
FIG. 1 is a circuit block diagram of a surge protector testing device provided by the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a surge protector testing device provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a circuit block diagram of a surge protector testing device provided by the invention is shown.
The embodiment of the invention provides a surge protector testing device which comprises a voltage regulating module 1, a rectifying module 2, a filtering module 3, a testing switch module 4, a display module 6 and a direct current surge protector 5, wherein the input end of the voltage regulating module 1 is connected to an alternating current power supply, and the output end of the voltage regulating module 1, the rectifying module 2, the filtering module 3 and the testing switch module 4 are sequentially connected;
the test switch module 4 comprises a first positive output end v1+ and a first negative output end V1-, the first positive output end v1+ of the test switch module 4 is connected with the power input end VI of the dc surge protector 5, and the ground end G of the dc surge protector 5 is connected with the first negative output end V1-of the test switch module 4 through the display module 6.
In a specific implementation, the first positive output end v1+ and the first negative output end V1-of the on-test switch module 4 are turned on, the ac voltage received by the input end of the on-test switch module is regulated by the voltage regulating module 1 to obtain an ac test voltage meeting a required voltage value, the ac test voltage is sent to the rectifying module 2 to be rectified, the rectifying module 2 sends the rectified dc test voltage to the filtering module 3, the filtering module 3 carries out filtering processing on the dc test voltage, and provides a more gentle dc test current for the dc surge protector 5 by the test switch module 4, the display module carries out real-time monitoring and display on the current flowing through the dc surge protector 5, and the test process and the test result of the dc surge protector 5 can be comprehensively observed by providing a dc short-circuit current, so that the reliability of the test of the dc surge protector 5 is improved.
It should be noted that, after the voltage regulating module 1 transforms the input alternating current, the rectification module 2 and the filtering module 3 are used for rectifying and filtering the input alternating current, and finally, high-voltage high-current direct current is output, so as to simulate and test whether the SPD detacher can complete safe detachment when encountering abnormal high-voltage high-current faults, and fire and explosion cannot be caused.
Further, the surge protector testing device further comprises an overload protection module 7, wherein the input end of the overload protection module 7 is connected to the alternating current power supply, and the output end of the overload protection module 7 is connected with the input end of the voltage regulating module 1.
When the dc arc is generated by the tripping of the disconnector of the dc surge protector 5 and the dc arc is serious and cannot be disconnected for a long time, the overload protection module 7 trips, and the circuit is cut off to prevent the accident from expanding. Wherein the overload protection module 7 may be a circuit breaker.
Further, the test switch module 4 further includes a second positive output terminal v2+ and a second negative output terminal V2-, and the second positive output terminal v2+ and the second negative output terminal V2 of the test switch module 4 are connected with the first output terminal VT1 and the second output terminal VT2 of the voltage regulating module 1 in a one-to-one correspondence.
When the common ac surge protector needs to be tested, the first positive output terminal v1+ and the first negative output terminal V1-of the test switch module 4 are turned off, and the second positive output terminal v2+ and the second negative output terminal V2-of the test switch module 4 are turned on, so that the test mode of the ac surge protector is switched to, and the test of the ac surge protector and the dc surge protector can be simultaneously realized through one surge protector device, thereby reducing the cost.
Referring to fig. 2, a schematic circuit diagram of an embodiment of a surge protector testing device provided by the present invention is shown. As shown in fig. 1 and 2, the voltage regulating module 1 further includes 8 voltage regulating transformers (T1-T8), the input end of the voltage regulating module 1 includes a first input end Vi1 and a second input end Vi2, and the output end of the voltage regulating module 1 includes a first output end VT1 and a second output end VT2;
the primary windings of the 8 voltage regulating transformers are connected in parallel and then connected across the first input end Vi1 and the second input end Vi2 of the voltage regulating module 1, and the secondary windings of the 8 voltage regulating transformers are connected in series and then connected across the first output end VT1 and the second output end VT2 of the voltage regulating module 1.
It should be noted that if a voltage-regulating transformer is adopted, the requirement of the production process of the voltage-regulating transformer is very high and the cost is very high if the high power is required to be maintained even if the voltage-regulating transformer is used, 8 voltage-regulating transformers are adopted to regulate the alternating voltage so as to obtain the alternating test voltage meeting the required voltage value, and the requirement of the production process of the voltage-regulating transformer is reduced, thereby reducing the cost.
Further, the rectifying module 2 is a bridge rectifying circuit, and the bridge rectifying circuit includes a positive input end, a negative input end, a positive output end and a negative output end, where the positive input end and the negative input end of the bridge rectifying circuit are connected with the first output end VT1 and the second output end VT2 of the voltage regulating module 1 in a one-to-one correspondence. The bridge rectifier circuit is formed by butting four diodes (D1, D2, D3 and D4) in pairs, and converts alternating current into direct current by rectifying the bridge rectifier circuit through unidirectional conductivity of the diodes.
Further, the filtering module 3 includes a first capacitor C1, a first end of the first capacitor C1 is connected to the positive output end of the bridge rectifier circuit, and a second end of the first capacitor C1 is connected to the negative output end of the bridge rectifier circuit.
Further, the filtering module 3 further includes a second capacitor C2, and the second capacitor C2 is connected in parallel with the first capacitor C1.
It should be noted that, the capacitor with a single large capacity and high withstand voltage is relatively large in volume and relatively expensive, and the first capacitor C1 and the second capacitor C2 are connected in parallel to increase the capacitance, so that the cost and the volume are reduced.
Further, the test switch module 4 further includes a positive input terminal vk+, a negative input terminal VK-, and a linkage switch SW, the positive input terminal vk+ of the test switch module 4 is connected to the first end of the first capacitor C1, and the negative input terminal VK-of the test switch module 4 is connected to the second end of the first capacitor C1;
the linkage switch SW includes a first movable contact K1, a second movable contact K2, a first stationary contact J1, a second stationary contact J2, a third stationary contact J3 and a fourth stationary contact J4, where the first movable contact K1 is a positive input end vk+ of the test switch module 4, the second movable contact K2 is a negative input end VK-of the test switch module 4, the first stationary contact J1 is a first positive output end v1+ of the test switch module 4, the second stationary contact J2 is a first negative output end V1-of the test switch module 4, the third stationary contact J3 is a second positive output end v2+ of the test switch module 4, and the fourth stationary contact J4 is a second negative output end V2-of the test switch module 4.
Further, the display module 6 includes an ammeter a and a shunt RW;
the first end of the current divider RW is connected to the ground terminal G of the dc surge protector 5, the second end of the current divider RW is connected to the first negative output terminal V1-of the test switch module 4, and the ammeter a is connected in parallel to the current divider RW. The magnitude of the output current is monitored and displayed in real time by adopting an ammeter A.
When the surge protector testing device is used for testing, the first positive output end and the first negative output end of the testing switch module are conducted, the alternating current voltage received by the input end of the testing switch module is regulated through the voltage regulating module to obtain alternating current testing voltage meeting the required voltage value, the alternating current testing voltage is sent to the rectifying module for rectifying treatment, the rectifying module sends the rectified direct current testing voltage to the filtering module, the filtering module carries out filtering treatment on the direct current testing voltage, and more gentle direct current testing current is provided for the direct current surge protector through the testing switch module, the display module carries out real-time monitoring and display on the current flowing through the direct current surge protector, and the direct current surge protector is tested through the provision of direct current short-circuit current, so that the testing process and the testing result of the direct current surge protector can be comprehensively observed, and the testing reliability of the direct current surge protector is improved.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (7)
1. The surge protector testing device is characterized by comprising a voltage regulating module, a rectifying module, a filtering module, a testing switch module, a display module and a direct current surge protector, wherein the input end of the voltage regulating module is connected to an alternating current power supply, and the output end of the voltage regulating module, the rectifying module, the filtering module and the testing switch module are sequentially connected;
the test switch module comprises a first positive output end and a first negative output end, the first positive output end of the test switch module is connected with the power input end of the direct current surge protector, and the grounding end of the direct current surge protector is connected with the first negative output end of the test switch module through the display module;
the surge protector testing device further comprises an overload protection module, wherein the input end of the overload protection module is connected to the alternating current power supply, and the output end of the overload protection module is connected with the input end of the voltage regulation module;
the voltage regulating module further comprises N voltage regulating transformers, the input end of the voltage regulating module comprises a first input end and a second input end, and the output end of the voltage regulating module comprises a first output end and a second output end;
primary windings of the N voltage regulating transformers are connected in parallel and then connected across the first input end and the second input end of the voltage regulating module, and secondary windings of the N voltage regulating transformers are connected in series and then connected across the first output end and the second output end of the voltage regulating module;
the test switch module further comprises a second positive output end and a second negative output end, and the second positive output end and the second negative output end of the test switch module are respectively and correspondingly connected with the first output end and the second output end of the voltage regulating module.
2. The surge protector test device of claim 1, wherein N = 8.
3. The surge protector testing device of claim 1, wherein the rectifying module is a bridge rectifying circuit, the bridge rectifying circuit comprises a positive input end, a negative input end, a positive output end and a negative output end, and the positive input end and the negative input end of the bridge rectifying circuit are respectively and correspondingly connected with the first output end and the second output end of the voltage regulating module.
4. The surge protector testing device of claim 3, wherein the filter module comprises a first capacitor, a first end of the first capacitor being connected to the positive output of the bridge rectifier circuit, and a second end of the first capacitor being connected to the negative output of the bridge rectifier circuit.
5. The surge protector testing device of claim 4, wherein the filter module further comprises a second capacitor connected in parallel with the first capacitor.
6. The surge protector testing device of claim 5, wherein the test switch module further comprises a positive input, a negative input, and a ganged switch, the positive input of the test switch module being connected to a first end of the first capacitor, the negative input of the test switch module being connected to a second end of the first capacitor;
the linkage switch comprises a first movable contact, a second movable contact, a first fixed contact, a second fixed contact, a third fixed contact and a fourth fixed contact, wherein the first movable contact is the positive input end of the test switch module, the second movable contact is the negative input end of the test switch module, the first fixed contact is the first positive output end of the test switch module, the second fixed contact is the first negative output end of the test switch module, the third fixed contact is the second positive output end of the test switch module, and the fourth fixed contact is the second negative output end of the test switch module.
7. The surge protector testing device of claim 1, wherein the display module comprises an ammeter and a shunt;
the first end of the current divider is connected with the grounding end of the direct current surge protector, the second end of the current divider is connected with the first negative output end of the test switch module, and the ammeter is connected with the current divider in parallel.
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| CN201811388048.9A CN109239502B (en) | 2018-11-21 | 2018-11-21 | Surge protector testing arrangement |
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| CN109239502B true CN109239502B (en) | 2023-09-08 |
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