CN207380210U - Breaker leakage current detection circuit - Google Patents

Abstract

The utility model is related to a kind of breaker leakage current detection circuits, including nominal operation module and detection module, the nominal operation module includes forming the working power of major loop, major loop switch, breaker and load meter after being sequentially connected in series, the detection module includes the test power supply of series connection, test switch and Leakage Current Detector, and the concatermer of the test power supply, test switch and Leakage Current Detector is in parallel with the breaker to form test loop.The utility model embodiment is by using the operational module mode in parallel with detection module, wherein breaker is connected with test module enables Leakage Current Detector intuitively to obtain leakage current of the breaker under most low hold voltage, detection circuit is simple for structure, Leakage Current Detector wherein in detection module can reach test the required accuracy using conventional on the market ammeter or universal meter, can effectively reduce testing cost.

Description

Breaker leakage current detection circuit

Technical field

The utility model is related to detection circuit technical field, more particularly to a kind of breaker leakage current detection circuit.

Background technology

Breaker is the electric current for referring to close, carry and cut-off under normal loop condition and can close, when defined Interior carrying and the switching device for cut-offfing the electric current under abnormal loop condition.

It needs to be detected the most low hold voltage of breaker in the production process of breaker, and to breaker most The detection of low hold voltage, can be in existing detection method usually using the leakage current parameter of breaker as criterion It is leaked by connecting precision resistance in circuit loop with detecting the voltage at precision resistance both ends so as to reach indirect detection breaker The purpose of electric current, but such detection method has the rated power of precision resistance and the measurement accuracy of voltmeter higher want It asks, improves testing cost；On the other hand, circuit can also be formed with breaker by using large power supply and load meter Mode, after breaker actuation, by large power supply voltage drop down to the most low hold voltage of breaker, by observing load meter Current indication on display screen is leakage current of the breaker under most low hold voltage, and the method is although simple and easy to do, still Need to use the large power supply and load meter for the condition of disclosure satisfy that, and the precision of existing large power supply can not expire on the market Sufficient test request adds testing cost, it is necessary to purchase specific high-precision high-power power supply and load meter.

Utility model content

The technical problems to be solved in the utility model is, for shortcoming of the prior art, to provide a kind of breaker Leakage current detection circuit.

The utility model solves the technological means that technical problem uses and is to provide a kind of breaker leakage current detection circuit, wraps Include nominal operation module and detection module, the nominal operation module include being formed after being sequentially connected in series the working power of major loop, Major loop switch, breaker and load meter, the detection module include the test power supply of series connection, test switch and leakage current test Instrument, the concatermer of the test power supply, test switch and Leakage Current Detector is in parallel with the breaker to form test loop.

Further, the Leakage Current Detector is using any one in following：Ammeter, universal meter and testing current Instrument.

Further, the test power supply uses Agilent DC power supply.

Further, the load meter is provided with display screen.

Further, the working power uses D.C. regulated power supply.

Using above-mentioned technical proposal, the utility model at least has the advantages that：The utility model will be by that will test It is in parallel with the breaker after power supply, test switch and Leakage Current Detector series connection to be formed at test loop and the test switch In off-state, and working power, major loop switch, breaker and load meter connect and to form major loop, and major loop switch is in Closure state, working power apply action current to breaker, and breaker is made to open protective effect so as to disconnect, major loop is opened Pass opens and is closed test switch at once, and working power is no longer tested power supply for breaker application voltage and applied most to breaker Low hold voltage, the reading for observing the Leakage Current Detector in detection module can obtain breaker under most low hold voltage Leakage current.The circuit structure of the utility model is simple and practicable, and the Leakage Current Detector use wherein in detection module is normal on the market The ammeter or universal meter of rule can reach test the required accuracy, can effectively reduce testing cost.

Description of the drawings

Fig. 1 is the structure diagram of the utility model breaker leakage current detection circuit.

Fig. 2 is the electrical block diagram of the utility model breaker leakage current detection circuit.

The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.

Specific embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work All other embodiments obtained shall fall within the protection scope of the present invention.

Referring to Fig. 1, the utility model provides a kind of technical solution：A kind of breaker leakage current detection circuit, including volume Determine operational module 1 and detection module 2.

The nominal operation module 1 includes the working power Q1 being formed into a loop after series connection, major loop switch K1, breaker A1 With load meter A2, the detection module 2 includes the test power supply Q2 of series connection, test switch K2 and Leakage Current Detector A3, described Test the concatermer formation test loop in parallel with the breaker A1 of power supply Q2, test switch K2 and Leakage Current Detector A3.

In the specific implementation, as shown in Fig. 2, the working power Q1 uses D.C. regulated power supply and the working power Q1 Anode be electrically connected with the input terminal of breaker A1, the output terminal of the breaker A1 passes sequentially through load meter A2 and major loop is opened Close the cathode composition major loop that K1 is connected to working power Q1；And the anode of the test power supply Q2 in detection module 2 passes through test Switch K2 is connected to the input terminal of breaker A1, and the cathode of the test power supply Q2 is connected to open circuit by Leakage Current Detector A3 The output terminal of device A1 is to form test loop, wherein Agilent DC power supply may be employed to improve test in the test power supply Q2 Precision.

In one alternate embodiment, it is disconnected to detect that ammeter or universal meter may be employed in the Leakage Current Detector A3 The leakage current of road device A1, it is, of course, also possible to using miscellaneous equipment, such as：Current tester or clamp meter, so as to reach to disconnected The purpose that the leakage current of road device A1 is detected.

The present embodiment by will test power supply Q2, test switch K2 and Leakage Current Detector A3 series connection after with the breaker A1 parallel connections and the test switch K2 and are off, and working power Q1, major loop switch K1, breaker A1 and load meter A2 connects to form major loop, and major loop switch K1 is in closure state, and working power Q1 applies action current to breaker A1, makes Breaker A1 opens protective effect and disconnects, and major loop switch K1 is opened and is closed test switch K2, working power Q1 at once No longer power supply Q2 is tested for breaker A1 application voltages and apply most low hold voltage to breaker A1, observe in detection module 2 Leakage Current Detector A3 reading i.e. can obtain leakage currents of the breaker A1 under most low hold voltage.The electricity of the utility model Line structure is simple and practicable, and the Leakage Current Detector A3 wherein in detection module 2 is using conventional on the market ammeter or general-purpose Table can reach test the required accuracy, can effectively reduce testing cost.

In one alternate embodiment, the load meter A2 is provided with display screen.User can be by load meter A2 Display screen directly observes the size of current in major loop, when breaker A1 opens protective effect and disconnects, on load meter A2 The current value of display screen is reduced to preset voltage value or so by the rated operational current moment of breaker A1, is closed test immediately and opens It closes K2 and disconnects major loop switch K1, only test power supply Q2 applies most low hold voltage, Ran Houzai to breaker A1 at this time Leakage currents of the breaker A1 under most low hold voltage can obtain by the reading for observing leakage current tester A3.It is described default Voltage value can be 2.5V or 3.0V, can be set in the specific implementation according to the specification of the breaker A1 of different model The preset voltage value is put, herein, the concrete numerical value of the preset voltage value is not specifically limited.By being set in load meter A2 Display screen is equipped with so that user directly observes the situation of change of electric current in major loop so as to avoid maloperation, improves measuring accuracy.

The operation principle and practical approach of the utility model breaker leakage current detection circuit are as follows：

The anode of working power Q1 is connected with the input terminal of breaker A1, the output terminal and load meter of the breaker A1 The cathode that the positive terminal connection of A2 and the negative pole end of load meter A2 are connected to working power Q1 forms major loop, and the major loop is opened K1 is closed to be connected on the circuit between the anode of working power Q1 and breaker A1.

The anode for testing power supply Q2 is connected to the input terminal of breaker A1 again, and the cathode for testing power supply Q2 then leads to successively It crosses leakage current tester A3 and test switch K2 and is connected to the output terminal of breaker A1, test power supply Q2, test switch K2, electric leakage Current test instrument A3 and breaker A1 forms test loop.

In normal operation, major loop switch K1 is closed and tests switch K2 and disconnect, and working power Q1 is to disconnected at this time Road device A1 applies rated operational voltage, and user can observe the size of current in major loop by the display screen on load meter A2.

When breaker A1 opens protective effect so as to disconnect, current value that the display screen on load meter A2 is shown is by moment Preset voltage value or so is reduced, be at this time immediately closed test switch K2 and disconnects major loop switch K1, test power supply Q2 is to disconnected Road device A1 applies most low hold voltage and working power Q1, and then interrupt voltage is supplied.Whether observation breaker A1 can keep 1 minute And pass through and read the reading of leakage current tester A3 and can obtain leakage currents of the breaker A1 under most low hold voltage.

The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention, Every equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is directly or indirectly transported Used in other related technical areas, it is equally included in the patent within the scope of the utility model.

Claims (5)

1. a kind of breaker leakage current detection circuit, including nominal operation module and detection module, it is characterised in that：It is described specified Operational module includes working power, major loop switch, breaker and the load meter of formation major loop after series connection, the detection module Test power supply including series connection, test switch and Leakage Current Detector, the test power supply, test switch and Leakage Current Detector Concatermer it is in parallel with the breaker formed test loop.

2. breaker leakage current detection circuit according to claim 1, it is characterised in that：The Leakage Current Detector uses Any one in below：Ammeter, universal meter and current tester.

3. breaker leakage current detection circuit according to claim 1, it is characterised in that：The test power supply is prompt using peace Human relations DC power supply.

4. breaker leakage current detection circuit according to claim 1, it is characterised in that：

The load meter is provided with display screen.

5. breaker leakage current detection circuit according to claim 1, it is characterised in that：The working power uses direct current Regulated power supply.