JPS6115661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current leakage circuit and a circuit breaker that interrupts a circuit when a current leakage accident occurs in the circuit.

Generally, to detect earth leakage or disconnection, an input terminal is installed on one side of the device, and an output terminal is installed on the other side (both terminals may be collected on one side), and a break section is installed between the two terminals. A zero-phase current transformer is placed between the wire break and the output terminal, and the current transformer detects unbalance between the detection wires due to current leakage and increases this as its secondary output. The output of the amplifier is used to drive an electromagnet device, and the drive of the electromagnet device opens the sheath section.

By the way, an amplifier sends the secondary output of a current transformer to a switching element that is equipped with a control end such as a thyristor or a latching relay and has a memory function, and closes the element, thereby eliminating the need for detection line breaks or breaks. The power source connected between the amplifier and the output terminal is used as the output of the amplifier to drive the electromagnet device.

This is because the secondary output of the current transformer is so small that it is practically impossible to directly amplify it to produce an output. Therefore, it may be more appropriate to call it a switching circuit rather than an amplifier.

Now, when performing earth leakage or disconnection in such a configuration, a load may be connected to the input terminal and a power source may be connected to the output terminal due to incorrect wiring. If this wiring is incorrect, the voltage to the amplifier will not be cut off even if the shield is opened due to an electrical leakage accident. Therefore, if the parts of the amplifier had a low tolerance, there was a risk of the amplifier being destroyed.

Therefore, a system was developed in which the power cut switch of the amplifier was linked to the drive of the handle, but this introduced a new problem.

That is, when measuring the insulation of the electrical circuit with the handle still in place, the insulation becomes 0 due to the amplifier, making it impossible to measure. This is especially true in the case of apartment buildings, where insulation measurements cannot be made at the lead-in point.

The present invention has been achieved in view of the above points, and includes:
In other words, a relay is inserted on the input side and the output side centering on the shingle break, and a relay contact is provided on the power supply of the amplifier, so that the input and output terminals can be connected in either direction. It is also intended to be able to measure the insulation of electrical circuits.

The present invention will be explained below based on a drawing showing an embodiment of the present invention. 1 is a beam and a disconnector body, 2a and 2b are input terminals, and 3a and 3b are output terminals, each of which is equipped on one side of the vessel body 1. ing. Of course, they may be gathered to one side. 4a, 4b are two detection lines connected between both terminals 2a, 3a, 5a, 5b are two detection lines 4a,
4b is a beam section that opens and closes by manual operation of the handle; 6 is a zero-phase current transformer located between the beam sections 5a, 5b and the output terminals 3a, 3b; 7 is a current transformer. Detection wires 4a, 4b in the event of electrical leakage on the secondary side of 6
An unbalanced current flows between them, and the current transformer 6 detects this and induces a secondary output on the secondary side 7. Reference numeral 8 denotes an amplifier, which is equipped with a control terminal such as a thyristor or a latching relay, and is composed of a switching element having a memory function, and when the switching element is closed by the secondary output of the current transformer 6, the detection line 4a is closed. , 4b as power supplies, the electromagnet device 10 is driven by the output of the amplifier 8. For this reason, it may be more appropriate to call it a switching circuit rather than an amplifier 8, but in this industry it is called an amplifier. The power supply circuit 9 of this amplifier 8 is connected to the cutout portions 5a, 5b and the output terminal 3.
It is taken out from the detection lines 4a and 4b so as to be between the lines a and 3b. Therefore, this electromagnet device 10 and the sheath cut portions 5a, 5b are interlocked, and the electromagnet device 10
When driven, the sheath cut portions 5a and 5b are opened. 11 is a relay, 12 is a capacitor, and the broken parts 5a, 5b
Detection lines 4a, 4b are connected between the input terminals 2a, 2b and
inserted in between. 13 is a relay, and 14 is a capacitor, which connects the cutout portions 5a, 5b and the output terminals 3a, 3.
b and is inserted between the detection lines 4a and 4b. Therefore, the contacts 11a, 1 of each relay 11, 13
3a is inserted in series with the power supply circuit 9 of the amplifier 8. X is a lead-in switch, and Y is a branch switch.

Next, to describe the connection between the drop-in switch Branch switch Y on terminals 3a and 3b
are connected.

In this state, the power supply side relay 11 is turned on and the contact 11
a is also turned on, but since the bow breakers 5a and 5b are not inserted, the load side relay 13 is not turned on and the contact 13a is turned on.
is also off. Therefore, the power supply to the amplifier 8 is cut off.

When inserting the sheath sections 5a and 5b from the above state,
The load side relay 13 is also turned on, and the contact 13a is also turned on. If a leakage occurs in this state, it will reach the secondary output 7 of the current transformer 6, the amplifier 8, and the electromagnet 10, and the sheath sections 5a and 5b will be opened. Due to the opening, the load side relay 13 also opens and the power supply to the amplifier 8 is cut off.

Next, input/output terminals 2a, 2b, 3a, 3 in the figure
If b is exchanged, output terminals 3a and 3
If the relay 13 on the b side is inserted, the disconnection parts 5a and 5b
is open, and relay 11 of input terminals 2a and 2b
Since it is open, the power supply to the amplifier 8 is cut off, and the situation is the same as above.

Therefore, there is no directionality in the power supply side and load side connections.

Next, describing the insulation measurement, the sheath section 5a, 5b
When the load side relay 13 is opened and the load side insulation is measured with the amplifier 8 turned off, the amplifier 8 is disconnected. Therefore, a true measurement value of the electric circuit can be obtained. Of course, it is the same even if the direction of the above-mentioned terminals is reversed.

In addition, when installing an earth leakage switch or disconnector in the main unit of each unit in a group housing such as an apartment, and attaching a lead-in switch , each relay 11,
13 is opened, the amplifier 8 is separated and the retractable switch
Subsequent insulation measurements can be performed all at once.

Incidentally, the capacitors 12 and 14 are designed to be charged with an insulation DC current during insulation measurement, and not to be passed to the relays 11 and 13 after a certain period of time.

The present invention provides capacitors 12 and 14 on the input side and the output side around the comb and cut portions 5a and 5b as described above.
Since the relays 11 and 13 are inserted through the power supply circuit 9 of the amplifier 8, and the relay contacts 11a and 13a are provided in the power supply circuit 9 of the amplifier 8, if the sheath sections 5a and 5b are open, one of the relays is always open. The contacts are also off, cutting off the power supply to the amplifier 8, and there is an effect that there is no directionality of connection between the power supply side and the load side of the disconnector.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the earth leakage circuit breaker of the present invention. 2a, 2b...Input terminal, 3a, 3b...Output terminal, 4a, 4b...Detection line, 5a, 5b...Shrink section, 6...Current transformer, 8...Amplifier, 9... ...Power circuit, 11, 13...Relay, 11a, 13a
... Contact, 12, 14 ... Capacitor.

Claims (1)

[Claims] 1. An input/output terminal, 2 detection lines connected between these input/output terminals, a sheath section provided on these 2 detection lines that opens and closes by manual operation of the handle, and this sheath section and output terminal. a zero-phase current transformer that is interposed between the two detection lines and detects an unbalanced current between the two detection lines;
An amplifier that amplifies the secondary output of the current transformer and uses the output to open the sheath section, and between the input terminal and the sheath section, and between the sheath section and the output terminal. An earth leakage device characterized in that it consists of a relay inserted through a capacitor between the two lines, and contacts of each of the relays inserted into the power supply circuit of the amplifier drawn out from the output terminal side. Shiya disconnector.