Portable voltage type release verification device

Abstract

The utility model relates to the field of electrical equipment verification, and particularly discloses a portable voltage type release verification device, which comprises a power supply unit, a test voltage unit, a voltage processing unit, a DSP control unit and a sampling unit, and is characterized in that the power supply unit, the test voltage unit, the voltage processing unit, a load terminal and the sampling unit are electrically connected in sequence; the DSP control unit is electrically connected with the test unit and the sampling unit respectively, test voltage is generated through the test voltage unit and transmitted to the load unit, one end of the load unit is connected with a secondary circuit of a current protection sensor of the tripper, and the sampling unit and the DSP control unit are used for collecting action voltage and action time of a tripping mechanism of the tripper. Compared with a traditional current type tripper verification device which adopts a mode of inputting large setting current to the tripper to enable the tripping mechanism to act, the current type tripper verification device provided by the utility model has the advantages of small damage to electronic elements of a secondary circuit of the tripper, capability of testing for a long time and multiple times, and higher safety.

Description

Technical Field

[0001] The utility model belongs to the field of electrical equipment calibration, and particularly relates to a portable voltage type release calibration device. Background Art

[0002] The trip unit is an important protection unit for electrical equipment such as high and low voltage circuit breakers and low voltage circuit breakers. It is connected to the mechanical structure of the circuit breaker and circuit breaker to release the holding mechanism and automatically disconnect the circuit breaker or circuit breaker. Its working principle is to detect the working current or voltage in the switch circuit of the circuit breaker or circuit breaker. When the trip unit detects that the working current or voltage in the switch circuit of the equipment is abnormal, the tripping mechanism of the trip unit starts to work, causing the circuit breaker or circuit breaker to trip, thereby protecting the line.

[0003] Therefore, the calibration of the release is an important part of the electrical test of electrical equipment such as high and low voltage circuit breakers and low voltage circuit breakers. According to the different structures and working principles, the current releases mainly include electromagnetic releases, pressure loss releases and electronic releases. Among them, except for the pressure loss release, the aforementioned releases all determine whether to trip the circuit breaker by detecting the current. Therefore, the current calibration equipment for the release is mainly a current type release test device, which passes a set current through the signal input end of the release. The set current is collected by the current transformer inside the release and processed by the analog quantity acquisition unit and converted into a digital signal for processing by the single chip microcomputer or comparator, and the output control signal drives the release mechanism to work, so that the circuit breaker or circuit breaker trips, and the test device then records the tripping current and tripping time. However, since the set current value output by the current type release test device is relatively large (generally 3 to 20A), the circuits and electronic components in the secondary circuit inside the release are mostly small-power components. If a set current higher than the normal working current is passed for a long time, the circuits and electronic components in the secondary circuit unit of the release will heat up, causing premature aging of components, affecting the service life of the release, and even burning these electronic components, causing the release to fail to work normally, and lose the protection function of the switch circuit of the circuit breaker or circuit breaker, so that the circuit breaker or circuit breaker cannot trip normally, endangering the safe operation of the line.

[0004] In view of this, the utility model proposes a portable voltage type trip unit test device, which directly inputs a set voltage on the secondary side of the current transformer of the trip unit, and the analog quantity acquisition unit of the trip unit directly collects the voltage for processing by a single chip microcomputer or a comparator, and outputs a control signal to drive the trip mechanism to operate, so that the circuit breaker or circuit breaker trips. Compared with the large set current input of the traditional current type trip unit test device, the current generated by the secondary circuit of the trip unit is smaller, which causes less damage to the electronic components inside the trip unit and has higher safety. Utility Model Content

[0005] The utility model aims to provide a portable voltage type release calibration device to solve the problem in the prior art that a current type release test device uses a relatively large set current to calibrate the release, which causes heating of the circuit and electronic components in the secondary circuit unit of the release, resulting in premature aging of components, affecting the service life of the release, and even burning out these electronic components, making the release unable to work.

[0006] To achieve the above purpose, the utility model provides a portable voltage type release calibration device, comprising:

[0007] Power supply unit;

[0008] A test voltage unit, wherein an input terminal of the test voltage unit is electrically connected to an output terminal of the power supply unit;

[0009] a voltage processing unit, wherein an input end of the voltage processing unit is electrically connected to an output end of the test voltage unit, and an output end of the voltage processing unit is electrically connected to a load terminal;

[0010] A DSP control unit and a sampling unit, wherein the input end of the sampling unit is electrically connected to the load terminal, the output end of the sampling unit is electrically connected to the DSP control unit, and the DSP control unit is electrically connected to an input end of the test voltage unit.

[0011] Preferably, in the above technical solution, the voltage processing unit includes a low-pass filter and a boost circuit, the input end of the low-pass filter is electrically connected to the output end of the test voltage unit, the output end of the low-pass filter is electrically connected to the input end of the boost circuit, and the output end of the boost circuit is electrically connected to the load terminal.

[0012] Preferably, in the above technical solution, the boost circuit includes a boost transformer and a resistance module, the resistance module is connected in series between the primary side of the boost transformer and the output end of the low-pass filter, and the secondary side of the boost transformer is electrically connected to the load terminal.

[0013] Preferably, in the above technical solution, the boost circuit also includes a switching switch and a first rectifier circuit, the secondary side of the boost transformer is electrically connected to the load terminal through the first switch loop of the switching switch, the input end of the first rectifier circuit is electrically connected to the second switch loop of the switching switch, and the output end of the first rectifier circuit is electrically connected to the load terminal.

[0014] Preferably, in the above technical solution, the sampling unit is a high-speed ADC module.

[0015] Preferably, in the above technical solution, it also includes a touch display screen and a key module, and the touch display screen and the key module are electrically connected to the DSP control unit respectively.

[0016] Preferably, in the above technical solution, the power supply unit includes an input switch and a second rectifier circuit, the input end of the input switch is connected to the AC power, the output end of the input switch is electrically connected to the input end of the second rectifier circuit, and the output end of the second rectifier circuit is electrically connected to an input end of the test voltage unit.

[0017] Compared with the existing technology, the utility model has the following beneficial effects:

[0018] 1. The utility model outputs the test voltage to the load terminal through the test voltage unit, and the other end of the load terminal is connected to the secondary terminal of the current transformer of the tripper, which is directly collected by the analog quantity acquisition unit of the tripper for processing by the single chip microcomputer or comparator inside the tripper, and the output control signal drives the tripping mechanism to work, so that the circuit breaker or circuit breaker trips, and the tripping mechanism action time and action voltage of the tripper are collected through the sampling unit. The current generated by the secondary circuit of the tripper is small, which causes less damage to the electronic components inside the tripper and has higher safety.

[0019] 2. The voltage processing unit of the utility model includes a low-pass filter and a boost circuit, which is electrically connected to the test voltage unit through the low-pass filter to achieve filtering of the output voltage of the test voltage unit, and is electrically connected to the low-pass filter through the boost circuit to increase the output voltage of the filtered test voltage. On the basis of ensuring a sufficiently large test voltage, the hardware structure of the device power supply unit and the test voltage unit is simplified, and the hardware cost of the device is reduced.

[0020] 3. The voltage processing unit of the utility model also includes a switching switch and a first rectifier circuit. The output AC voltage signal of the test voltage unit is rectified into a DC test voltage signal by the first rectifier circuit. The switching switch selects the output of the AC and DC voltage signals, so that the utility model can not only calibrate the AC type release, but also the DC type release. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall electrical principle structure of the utility model.

[0022] Figure 2 This is a schematic diagram of the electrical principle structure of the voltage processing unit of the utility model.

[0023] Figure 3 This is a schematic diagram of the electrical principle structure of the power supply unit of the utility model.

[0024] In the figure: 100—DSP control unit, 101—touch display screen, 102—button module, 103—power supply unit, 104—test voltage unit, 105—voltage processing unit, 106—load terminal, 107—sampling unit, 108—low-pass filter, 109—boost circuit, 110—resistance module, 111—first rectifier circuit, 112—second rectifier circuit, K1—switching switch, K2—input switch, T—boost transformer. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0026] refer to Figure 1 In this embodiment, a portable voltage type release verification device includes a power supply unit 103, a test voltage unit 104, a voltage processing unit 105, a DSP control unit 100, a sampling unit 107 and a load terminal 106, an input end of the test voltage unit 104 is electrically connected to the output end of the power supply unit 103, an input end of the voltage processing unit 105 is electrically connected to the output end of the test voltage unit 104, an output end of the voltage processing unit 105 is electrically connected to the load terminal 106, an input end of the sampling unit 107 is electrically connected to the load terminal 106, and an output end of the sampling unit 107 is electrically connected to the load terminal 106. The DSP control unit 100 is electrically connected, and the DSP control unit 100 is electrically connected to an input end of the test voltage unit 104. In the present embodiment, the chip model selected by the DSP control unit 100 may be TMS320VC549PGE, and the ADC chip model selected by the sampling unit 107 may be a 32-bit high-speed ADC of F280049PZQR. The test voltage unit 104 may be composed of a full-bridge inverter circuit composed of four MOS tubes. The switching frequency of the full-bridge inverter circuit is driven by the DSP control unit 100, thereby realizing the adjustment of the output test voltage.

[0027] Continue to refer Figure 1 The portable voltage type release verification device of the present embodiment further includes a touch screen 101 and a key module 102 , and the touch screen 101 and the key module 102 are electrically connected to the DSP control unit 100 respectively.

[0028] refer to Figure 2The voltage processing unit 105 includes a low-pass filter 108 and a boost circuit 109. The input end of the low-pass filter 108 is electrically connected to the output end of the test voltage unit 104, the output end of the low-pass filter 108 is electrically connected to the input end of the boost circuit 109, and the output end of the boost circuit 109 is electrically connected to the load terminal 106. The boost circuit 109 includes a resistance module 110, a boost transformer T, a switch K1 and a first rectifier circuit 111. The resistance module 110 is connected in series between the primary side of the boost transformer T and the output end of the low-pass filter 108, the secondary side of the boost transformer T and the first switch loop of the switch K1 are electrically connected to the load terminal 106, the input end of the first rectifier circuit 111 is electrically connected to the second switch loop of the switch K1, and the output end of the first rectifier circuit 111 is electrically connected to the load terminal 106. In this embodiment, the resistance module 110 is formed by connecting a plurality of resistors in series with an analog switch. The resistance module 110 is connected in series with the primary circuit of the boost transformer T. The output voltage of the test voltage unit 104 is assumed to be U1, and the secondary output voltage of the boost transformer T is assumed to be U2. U2=U1*N2 / N1, wherein N2 / N1 is the ratio of the number of turns of the secondary and primary coils of the boost transformer T. Since the resistance module 110 is connected in series with the primary circuit of the boost transformer T, according to Ohm's law, the resistance module 110 generates a voltage U3. Therefore, the secondary output voltage U2 of the boost transformer T is U2=(U1+U3)*N2 / N1. Therefore, the voltage of U2 is increased, thereby improving the output voltage capability of the device. Meanwhile, the hardware structure of the device power supply unit 103 and the test voltage unit 104 is simplified, thereby reducing the hardware cost of the device. The output AC voltage signal of the test voltage unit is rectified into a DC test voltage signal by the first rectifier circuit, and the switch is used to select the output of the AC and DC voltage signals, so that the utility model can not only calibrate the AC type release, but also the DC type release.

[0029] refer to Figure 3 The power supply unit 103 includes an input switch K2 and a second rectifier circuit 112, the input end of the input switch K2 is connected to the mains, the output end of the input switch K2 is electrically connected to the input end of the second rectifier circuit 112, and the output end of the second rectifier circuit 112 is electrically connected to an input end of the test voltage unit 104. In this embodiment, the second rectifier circuit is a full-bridge rectifier circuit composed of four diodes, which is used to rectify the AC mains into the DC power required for the device to work.

[0030] During the test, one end of the load terminal 106 is connected to the secondary side circuit terminal of the release to be tested. The user selects the content to be adjusted and the size of the output voltage by inputting operations on the touch display screen 101 and the key module 102. After receiving the input of the touch display screen 101 and the key module 102, the DSP control unit 100 sends a driving instruction to the test voltage unit 104, and the test voltage unit 104 outputs a test voltage. The test voltage is filtered and boosted by the low-pass filter 108, the series resistor 110 and the step-up transformer T of the voltage processing unit 105 in turn, and then output to the load terminal 106 by the switching switch K1 of the voltage processing unit 105. When the release to be tested is an AC type, the first switch circuit of the switching switch K1 is closed, and the boost circuit 109 outputs an AC test voltage with a size of 50 to 1500 mV. When the release to be tested is a DC type, the second switch circuit of the switching switch K1 is closed, and the test voltage is converted into a DC voltage by the first rectifier circuit 111 and input to the load terminal 106. The tripping mechanism action time, action voltage and resistance of the secondary circuit of the tripper are collected by the collection unit 107 and the DSP control unit 100 and displayed on the touch screen 101. The user can also convert the action voltage into action current according to Ohm's law based on test requirements.

[0031] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A portable voltage type release calibration device, characterized in that: include: Power supply unit; A test voltage unit, wherein an input terminal of the test voltage unit is electrically connected to an output terminal of the power supply unit; a voltage processing unit, wherein an input end of the voltage processing unit is electrically connected to an output end of the test voltage unit, and an output end of the voltage processing unit is electrically connected to a load terminal; A DSP control unit and a sampling unit, wherein the input end of the sampling unit is electrically connected to the load terminal, the output end of the sampling unit is electrically connected to the DSP control unit, and the DSP control unit is electrically connected to an input end of the test voltage unit.

2. A portable voltage type release test device according to claim 1, characterized in that: The voltage processing unit includes a low-pass filter and a boost circuit, the input end of the low-pass filter is electrically connected to the output end of the test voltage unit, the output end of the low-pass filter is electrically connected to the input end of the boost circuit, and the output end of the boost circuit is electrically connected to the load terminal.

3. A portable voltage type release test device according to claim 2, characterized in that: The boost circuit includes a boost transformer and a resistance module, wherein the resistance module is connected in series between the primary side of the boost transformer and the output end of the low-pass filter, and the secondary side of the boost transformer is electrically connected to the load terminal.

4. A portable voltage type release test device according to claim 3, characterized in that: The boost circuit also includes a switching switch and a first rectifier circuit. The secondary side of the boost transformer is electrically connected to the load terminal through the first switch loop of the switching switch. The input end of the first rectifier circuit is electrically connected to the second switch loop of the switching switch. The output end of the first rectifier circuit is electrically connected to the load terminal.

5. A portable voltage type release test device according to claim 1, characterized in that: The sampling unit is a high-speed ADC module.

6. A portable voltage type release test device according to claim 1, characterized in that: It also includes a touch display screen and a key module, and the touch display screen and the key module are electrically connected to the DSP control unit respectively.

7. A portable voltage type release test device according to claim 1, characterized in that: The power supply unit includes an input switch and a second rectifier circuit, the input end of the input switch is connected to the mains, the output end of the input switch is electrically connected to the input end of the second rectifier circuit, and the output end of the second rectifier circuit is electrically connected to an input end of the test voltage unit.

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