CN212229071U - Instrument aging testing cabinet - Google Patents
Instrument aging testing cabinet Download PDFInfo
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- CN212229071U CN212229071U CN202020758602.4U CN202020758602U CN212229071U CN 212229071 U CN212229071 U CN 212229071U CN 202020758602 U CN202020758602 U CN 202020758602U CN 212229071 U CN212229071 U CN 212229071U
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- 238000012360 testing method Methods 0.000 title claims abstract description 72
- 230000032683 aging Effects 0.000 title claims abstract description 22
- 230000009466 transformation Effects 0.000 claims abstract description 13
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
The utility model relates to an instrument aging test cabinet, which is provided with a power supply switching circuit; the power supply switching circuit comprises a power supply input end, a voltage transformation unit, a switching unit and a power supply output end, wherein the power supply output end is used for being connected with the instrument to be tested so as to provide a variable voltage test environment for the instrument to be tested. The instrument aging test cabinet of the utility model can stably output three power supply voltages to the instrument to be tested, and broaden the test range, thereby obtaining reliable test results; in addition, the power supply switching circuit realizes the electrical interlocking of the three-way contactor by introducing the intermediate relay, ensures the power supply safety of the power supply switching circuit and prevents the instrument to be tested from being damaged in the testing process.
Description
Technical Field
The utility model relates to an instrument observes and controls technical field, more specifically, relates to an instrument aging testing cabinet.
Background
The instrument aging test cabinet is used for testing whether the instrument has faults when the instrument leaves a factory, so that the reliability of the instrument is relatively improved after the instrument enters the market.
Because the working voltages of the meters are greatly different in a range taking global mains supply as a reference, in order to intelligently simulate the working state of the meters under the environment suitable for various mains supply changes and voltage fluctuations, and even provide a more extreme test environment, the meter aging test cabinet is generally required to have a variable voltage test environment.
The existing instrument aging test cabinet cannot provide an intelligent variable voltage test environment, so that the test result of the instrument aging test cabinet does not have high reliability.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned technical problem, provide an instrument aging testing cabinet, it can stably provide the transformer voltage test environment to improve instrument aging testing's reliability.
In order to achieve the above purpose, the technical scheme of the utility model is that: an instrument aging test cabinet is provided with a power supply switching circuit, wherein a power supply output end of the power supply switching circuit is connected with an instrument to be tested so as to provide a variable voltage test environment;
the power supply switching circuit includes:
the power supply input end is used for accessing a first test voltage;
the input end of the voltage transformation unit is coupled with the power supply input end, and the voltage transformation unit respectively outputs a second test voltage and a third test voltage through a first output end and a second output end; the first test voltage is greater than the second test voltage and less than the third test voltage;
the switching unit comprises a time relay, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay, a fifth intermediate relay, a first contactor, a second contactor and a third contactor; the time relay is provided with a first time sequence switch and a second time sequence switch which are switched on according to a preset time sequence; a coil of the first intermediate relay, a normally closed contact of the second intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fourth intermediate relay to form a first branch circuit; a coil of the second intermediate relay, a normally closed contact of the first intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fifth intermediate relay to form a second branch; a coil of the third intermediate relay, the normally closed contact of the first intermediate relay, the normally closed contact of the second intermediate relay, the normally closed contact of the fourth intermediate relay and the normally closed contact of the fifth intermediate relay are connected in series to form a third branch; the first time sequence switch and the second time sequence switch are respectively connected with the first branch circuit and the second branch circuit in series and are connected with the power supply input end, and the third branch circuit is also connected with the power supply input end; the coils of the first contactor, the second contactor and the third contactor are respectively connected with the power supply input end through the normally open contacts of the first intermediate relay, the second intermediate relay and the third intermediate relay;
and the power supply output end is respectively connected with the first output end, the second output end and the power supply input end through the normally open contacts of the first contactor, the second contactor and the third contactor.
In one embodiment: and the coil of the time relay is connected with the power supply input end.
In one embodiment: the power supply device also comprises a power supply indicator light which is connected with the power supply input end.
In one embodiment: the voltage transformation unit is a double-output transformer.
In one embodiment: the power supply system also comprises an output voltmeter which is connected in parallel with the power supply output end.
In one embodiment: the power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through the first manual switch.
In one embodiment: the switching unit is connected with the power supply input end through a second manual switch.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the instrument aging test cabinet provided by the embodiment of the utility model is provided with a power supply switching circuit, can stably output three power supply voltages to the instrument to be tested, and widens the test range, thereby obtaining reliable test results;
(2) the utility model discloses instrument aging testing cabinet, power supply switching circuit are through introducing fourth auxiliary relay and fifth auxiliary relay, and locate the coil return circuit of third auxiliary relay with its normally closed contact, make the electric interlocking that has realized three routes auxiliary relay under the condition that time relay only has two way outputs, thereby realize the electric interlocking of three routes contactor with lower cost, guaranteed power supply switching circuit's power supply safety, prevent to damage the instrument to be measured in the test process;
(3) the instrument aging test cabinet provided by the embodiment of the utility model is provided with the power indicator lamp connected with the power supply input end, and can prompt the power supply state of the instrument to the operator;
(4) the utility model discloses instrument aging testing cabinet, output voltmeter connect in parallel in the power supply output to can show the real-time supply voltage of the instrument that awaits measuring.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a circuit diagram of a power supply switching circuit of an instrument aging test cabinet according to an embodiment of the present invention.
Detailed Description
The technical solution 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. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence. In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, if the term "electrically connected" is used, it is meant to include both direct electrical connection and indirect electrical connection.
Referring to fig. 1, an embodiment of the utility model provides an instrument aging testing cabinet has power supply switching circuit, and its power supply output end is used for connecting the instrument that awaits measuring to provide the transformer voltage test environment.
Specifically, the power supply switching circuit includes: the power supply system comprises a power supply input end, a voltage transformation unit, a switching unit and a power supply output end.
The power supply input end is connected with a first test voltage, in the embodiment, the power supply input end comprises a live wire end and a zero wire end, and the first test voltage is 220V.
The input end of the voltage transformation unit is coupled with the power supply input end and is provided with a first output end and a second output end so as to output a second test voltage and a third test voltage respectively through the first output end and the second output end. In this embodiment, the voltage transformation unit is a dual-output transformer, the second test voltage is 90V, and the third test voltage is 280V, that is, the first test voltage is greater than the second test voltage and less than the third test voltage.
The switching unit includes a first contactor KM1, a second contactor KM2, a third contactor KM3, a time relay, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, and a fifth intermediate relay KA 5. The coils of the contactors are respectively arranged on the normally open contact circuits of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3, so that the normally open contacts of the contactors are selectively closed or opened under the conduction condition of the circuits.
The power supply output end is respectively connected with the first output end, the second output end and the power supply input end through normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3, so that switching control of output voltage is realized.
In order to prevent the normally open contacts of the first contactor KM1, the second contactor KM2 and the third contactor KM3 from being closed at the same time, the power supply safety during testing is ensured, and the instrument is prevented from being damaged during the testing process. In this embodiment, the coils of the first contactor KM1, the second contactor KM2 and the third contactor KM3 are respectively connected to the power supply input end through the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA 3.
In a specific circuit structure, the time relay is provided with a first time sequence switch AL1 and a second time sequence switch AL2 which are switched to be closed according to a preset time sequence, and a coil of the time relay is connected with the power supply input end. In this embodiment, the time relay is integrated in an intelligent instrument controller, and the model of the intelligent instrument controller is AI-716P.
The coil of the first intermediate relay KA1, the normally closed contact of the second intermediate relay KA2 and the normally closed contact of the third intermediate relay KA3 are connected in series and then connected with the coil of the fourth intermediate relay KA4 in parallel to form a first branch circuit.
And a coil of the second intermediate relay KA2, a normally closed contact of the first intermediate relay KA1 and a normally closed contact of the third intermediate relay KA3 are connected in series and then are connected with a coil of the fifth intermediate relay KA5 in parallel to form a second branch.
The coil of the third intermediate relay KA3, the normally closed contact of the first intermediate relay KA1, the normally closed contact of the second intermediate relay KA2, the normally closed contact of the fourth intermediate relay KA4 and the normally closed contact of the fifth intermediate relay KA5 are connected in series to form a third branch.
The first timing switch AL1 and the second timing switch AL2 are connected in series with the first branch and the second branch, respectively, and are connected to the power supply input terminal, and the third branch is also connected to the power supply input terminal.
Therefore, the embodiment of the utility model provides an its theory of operation of instrument aging testing cabinet is as follows:
after the instrument to be tested is connected to the power supply output end, the working voltage of the instrument is controlled by the output voltage of the power supply switching circuit. Because the coil of the time relay is connected to the power supply input end, the time relay switches and closes the first timing switch AL1 and the second timing switch AL2 according to the preset timing after being electrified.
When the first timing switch AL1 is closed, the coils of the first intermediate relay KA1 and the fourth intermediate relay KA4 are electrified, the normally open contact of the first intermediate relay KA1 is closed, the coil of the first contactor KM1 is electrified, the normally open contact of the coil is closed, and the output end outputs 90V to supply power for the instrument. Simultaneously, first intermediate relay KA1 and fourth intermediate relay KA 4's normally closed contact disconnection, make second intermediate relay KA2 and third intermediate relay KA 3's coil can not the circular telegram, first intermediate relay KA1 has been prevented, second intermediate relay KA2 and third intermediate relay KA 3's normally open contact is closed simultaneously, first contactor KM1 like this, second contactor KM2, third contactor KM 3's coil can not be circular telegram simultaneously, its normally open contact just can not be closed simultaneously yet, power supply safety when having guaranteed the test.
Based on the same principle, when the second timing switch AL2 is closed, the coils of the second intermediate relay KA2 and the fifth intermediate relay KA5 are electrified, the normally open contact of the second intermediate relay KA2 is closed, the coil of the second contactor KM2 is electrified, the normally open contact is closed, and the output end of the second contactor KM2 outputs 280V to supply power to the instrument. Meanwhile, the normally closed contacts of the second intermediate relay KA2 and the fifth intermediate relay KA5 are disconnected, so that the coils of the first intermediate relay KA1 and the third intermediate relay KA3 cannot be electrified, the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3 are prevented from being closed at the same time, and power supply safety during testing is guaranteed.
When the first timing switch AL1 and the second timing switch AL2 are both off, the coils of the first intermediate relay KA1, the second intermediate relay KA2, the fourth intermediate relay KA4 and the fifth intermediate relay KA5 are not electrified, so that the normally closed contacts of the third branch are all closed, the coil of the third intermediate relay KA3 is electrified, the normally open contact of the third intermediate relay is closed, and the output end of the output end. Meanwhile, the normally closed contact of the third intermediate relay KA3 is disconnected, so that the coils of the first intermediate relay KA1 and the second intermediate relay KA2 cannot be electrified, the normally open contacts of the first intermediate relay KA1, the second intermediate relay KA2 and the third intermediate relay KA3 are prevented from being closed simultaneously, and the power supply safety during testing is also guaranteed.
The utility model discloses an introduce fourth auxiliary relay KA4 and fifth auxiliary relay KA5 to locate third auxiliary relay KA 3's coil return circuit with its normally closed contact, make the electric interlocking that has realized three routes auxiliary relay under the condition that time relay only has two way outputs, thereby realized the electric interlocking of three routes contactor with lower cost, guaranteed power supply switching circuit's power supply safety, prevent to damage the instrument at the test procedure.
In addition, in this embodiment, in one working cycle of the time relay, the first timing switch AL1 and the second timing switch AL2 are configured as follows: the sequence of both open, first timing switch AL1 closed, both open, second timing switch AL2 closed, both open cycles. Therefore, the test cabinet circularly switches according to the sequence of the power supply voltage of 220V-90V-220V-280V-220V and supplies power to the instrument to be tested.
In a preferred embodiment, the meter testing aging cabinet further comprises a power indicator lamp, an output voltmeter, a first manual switch QS and a second manual switch SB 1.
The power supply indicator light is connected with the power supply input end to prompt the power supply state. The output voltmeter is connected in parallel to the power supply output end to display the real-time power supply voltage of the instrument to be tested.
The power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through a first manual switch QS. The switching unit is connected to the supply input via a second manual switch SB 1. The first manual switch QS is a knife switch, and the second manual switch SB1 is a button switch, so that an operation interface is provided for a test operator, and the electricity safety is ensured.
The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.
Claims (7)
1. The utility model provides an instrument aging testing cabinet which characterized in that: the instrument aging test cabinet is provided with a power supply switching circuit, and the power supply output end of the power supply switching circuit is connected with an instrument to be tested so as to provide a variable voltage test environment;
the power supply switching circuit includes:
the power supply input end is used for accessing a first test voltage;
the input end of the voltage transformation unit is coupled with the power supply input end, and the voltage transformation unit respectively outputs a second test voltage and a third test voltage through a first output end and a second output end; the first test voltage is greater than the second test voltage and less than the third test voltage;
the switching unit comprises a time relay, a first intermediate relay, a second intermediate relay, a third intermediate relay, a fourth intermediate relay, a fifth intermediate relay, a first contactor, a second contactor and a third contactor; the time relay is provided with a first time sequence switch and a second time sequence switch which are switched on according to a preset time sequence; a coil of the first intermediate relay, a normally closed contact of the second intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fourth intermediate relay to form a first branch circuit; a coil of the second intermediate relay, a normally closed contact of the first intermediate relay and a normally closed contact of the third intermediate relay are connected in series and then connected in parallel with a coil of the fifth intermediate relay to form a second branch; a coil of the third intermediate relay, the normally closed contact of the first intermediate relay, the normally closed contact of the second intermediate relay, the normally closed contact of the fourth intermediate relay and the normally closed contact of the fifth intermediate relay are connected in series to form a third branch; the first time sequence switch and the second time sequence switch are respectively connected with the first branch circuit and the second branch circuit in series and are connected with the power supply input end, and the third branch circuit is also connected with the power supply input end; the coils of the first contactor, the second contactor and the third contactor are respectively connected with the power supply input end through the normally open contacts of the first intermediate relay, the second intermediate relay and the third intermediate relay;
and the power supply output end is respectively connected with the first output end, the second output end and the power supply input end through the normally open contacts of the first contactor, the second contactor and the third contactor.
2. The meter burn-in test cabinet of claim 1, wherein: and the coil of the time relay is connected with the power supply input end.
3. The meter burn-in test cabinet of claim 1, wherein: the power supply device also comprises a power supply indicator light which is connected with the power supply input end.
4. The meter burn-in test cabinet of claim 1, wherein: the voltage transformation unit is a double-output transformer.
5. The meter burn-in test cabinet of claim 1, wherein: the power supply system also comprises an output voltmeter which is connected in parallel with the power supply output end.
6. The meter burn-in test cabinet of claim 1, wherein: the power supply input end is connected with the voltage transformation unit, the switching unit and the power supply output end through the first manual switch.
7. The meter burn-in test cabinet of claim 1, wherein: the switching unit is connected with the power supply input end through a second manual switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020758602.4U CN212229071U (en) | 2020-05-09 | 2020-05-09 | Instrument aging testing cabinet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020758602.4U CN212229071U (en) | 2020-05-09 | 2020-05-09 | Instrument aging testing cabinet |
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| CN212229071U true CN212229071U (en) | 2020-12-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047926A (en) * | 2022-05-30 | 2022-09-13 | 上海飞奥燃气设备有限公司 | Automatic testing system and method for reliability of electric edge environment |
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- 2020-05-09 CN CN202020758602.4U patent/CN212229071U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115047926A (en) * | 2022-05-30 | 2022-09-13 | 上海飞奥燃气设备有限公司 | Automatic testing system and method for reliability of electric edge environment |
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