JPS6159043B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a test device for electric leakage and disconnection.

In general, the circuit shown in FIG. 1 is known as an electric leakage circuit or disconnection circuit.

That is, in Fig. 1, when a current leakage occurs or a current leakage occurs in the load L connected to the disconnector A, the zero-phase current transformer 1 detects an unbalanced current, induces a leakage output voltage in the secondary winding 2, and The induced voltage is switched by the switching device 3 (it may be amplified if the output is very small), current flows through the tripping electromagnet 4, and the electromagnetic force generated in the tripping electromagnet 4 causes the wire to break (contact). 8,
9 to open the electrical circuit.

Therefore, it is necessary to check whether the earth leakage detection functions of the zero-phase current transformer 1, secondary winding 2, width increaser, switching device 3, etc. are normal. Test confirmation switch 6 installed in
When you press , the test current limited by resistor 5 is applied to wire 7.
flows through. This current is detected by the zero-phase current transformer 1 and a voltage is induced, which is amplified and switched to the switching device 3.
The tripping electromagnet 4 is activated by the operation of , and the insulation parts (contacts) 8 and 9 are opened to open the electric circuit. It can be confirmed that the leakage detection function of the switching device 3 is normal.

By the way, this test confirmation is generally recommended to be carried out once or twice a month considering the role of current leakage and disconnector A to protect against electric shock, but it is recommended that this test be carried out once or twice a month. Equipment L
In this case, the disadvantage is that there are many cases in which the electric circuit is interrupted even temporarily during test confirmation.

The present invention has been made in view of the above-mentioned points, that is, the functions of the zero-phase current transformer 1, the secondary winding 2, the width increaser, the switching device 3, etc. can be changed without interrupting the electrical circuit. The purpose of this is to confirm whether the system is normal or not.

Hereinafter, the present invention will be explained based on the drawings showing examples of the present invention. FIG. 2 is a block diagram of the present invention and shows the circuit state before test confirmation, and FIG. 3 is a circuit diagram showing the state during test confirmation. Note that the same numbers as in the conventional example are used in the figures. A is the current leakage or disconnection switch, L is the load connected to the current leakage or disconnection switch, I is the zero-phase current transformer, 2 is the secondary winding wound around the zero-phase current transformer, and 3 is the secondary winding wound around the zero-phase current transformer. An amplifier and a switching device for detecting leakage by the zero-phase current transformer 1, inducing a leakage output voltage in the secondary winding 2, and switching the induced voltage; 4 is a tripping electromagnet; 6 is a test switch at one end; is wired 7 through a zero-phase current transformer 1, and the other end is wired 7 to an amplifying and switching device 3 via a resistor 5. 8 and 9 are cross sections (contact points) that interlock with the tripping electromagnet 4; 10
operates the test switch 6 and a normally closed switch connected in series with one end of the tripping electromagnet 4. A resistor 11 and a light emitting element 12 such as a light emitting diode or a neon lamp are connected in series and connected in parallel to both ends of the switch 10.

Next, the operation of the earth leakage and disconnection circuit according to the present invention will be explained with reference to FIG. Then, a voltage is induced in the secondary winding 2 and switched by the amplifying and switching device 3.

At this time, the current flowing through the tripping electromagnet 4 is interlocked to open the switch, so it is limited to a small value by the resistor 11, and its attractive force is small, making it impossible to open the broken part (contact). Resistance 11 so that there is no
Since the value of is determined, the light emitting element emits light, but the power supply voltage continues to be supplied to the load L.

As described above, the present invention has the feature of detecting current leakage by checking whether or not the current leakage detection function of the zero-phase current transformer 1, secondary winding 2, width increaser, switching device 3, etc. is normal or not based on the presence or absence of light emission from the light emitting element 12. This has the effect of making it possible to obtain test equipment for disconnectors and disconnectors.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a circuit diagram of the present invention, and FIG. 3 is a malfunction circuit diagram. A...Earth leakage or disconnection, L...Load, 1...Zero-phase current transformer, 2...Secondary winding, 3...Width increase, switching device, 4...Tripping electromagnet, 5... resistance, 6
...Test switch, 7...Wiring, 8,9...Contact, 10...Normally closed switch, 11...Resistance, 12
...Light emitting element.

Claims (1)

[Claims] 1 Mechanically converts the secondary output of the zero-phase current transformer generated by the leakage current flowing between the detection lines, and this mechanical operation opens the shear break provided in the detection line. In the event of an earth leakage or disconnection, the test switch for the condensed leakage circuit that produces a secondary output in the zero-phase current transformer is linked with a switch connected in series with one end of the tripping electromagnet. and a resistor and a light emitting element are connected in parallel to both ends of the switch on the tripping electromagnet side.