JPS5839219A - 3-phase 3-wired circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit breaker for 3 and 13 wires.

The conventional circuit breaker in this building had power supply side and load side terminal devices for each phase at both ends, and a mechanical frame, short circuit sensor, contacts, bimetal, etc. were constructed between these.

By the way, since there is a phase difference of 2/:(π between the currents Iue 181 IT of each phase as shown in Fig. 2, for example, when the current IS of the S phase is maximum, the current between the R phase and the T phase IToIR is in the opposite direction.The same applies to the transient current at the time of short circuit.

However, when the short-circuit sensors are arranged in parallel with each other, when a short-circuit occurs, e.g. lf style ISO
When detecting a short circuit at the maximum value, excitation coil L of the short circuit sensor
As shown in Figure 1, the external magnetic field generated by s (pointed down by the arrow) is in the opposite direction to the external magnetic field generated by other excitation coils (-T e I-u), so they cancel each other out, causing magnetic loss in coils I and s. occurs, and as a result, there is a problem in that the attraction force characteristics of the short circuit sensor are reduced.

Therefore, an object of the present invention is to provide a three-phase, three-wire circuit breaker that reduces magnetic loss by having an FF11 configuration.

An embodiment of this invention is shown in FIGS. 3 and 4. In the figure, 1 is the device stand, 2 is the cover, 3 is the power supply side terminal device,
4 is a fixed contact, 5 is a fixed contact, 6 is a movable contact, 7 is a movable contact, 8 is a copper stranded wire, 9 is a bimetal, 10 is a copper stranded wire, 11 is an excitation coil of short circuit sensor A, 12 is a load(
An electric path is formed between the Ill terminal device and the power supply side terminal device 3 by the above-mentioned elements. In addition, 13 is a frame, ] 4 is a return spring that biases the movable contact 7 to open, 15
is the first link, 16 is the second link, 17 is the third link, 18 is the tri-tub link, 19 is the trip link,
Reference numeral 20 is a trip link rod, 21 is a handle, and 22 is an arc extinguishing device. Further, the short circuit sensor A includes a yoke 23,
a coil tube 24, the coil 11, a fixed iron core 25,
It consists of a plunger 26, an output rod 27, and a return spring 28 for operation setting.

The second configuration is Mizozukuri for the l polar component, and the remaining two
The polar segments are arranged in parallel in a direction perpendicular to the plane of the paper, and each component element is placed in the same position. Among them, especially the excitation coils L'R' ``C of the short circuit sensors A arranged in parallel with each other.
In 'J'''T, the coil L'B in the middle is wound in the opposite direction with respect to the other coils [-'R+L'T.

Explain the operation. Trip link 18 is trip link 1
9 and turn the handle 21 to the right as shown in the figure, the second link 16 pushes down the connecting shaft 29 and the first
By placing the link 15 in the horizontal state, the movable contact 7 is driven to close against the return spring 14, and the second link 1
6 is supported by the frame 13 in an inverted state. This is the on state, and when the handle 21 is pressed to turn it off, the movable contact 7 is opened in the opposite manner to the above.

When the terminal device 3.12 is connected to the 3-phase wiring path, the rated current flows in the internal circuit, but if an overcurrent of several times the rated current flows in the V circuit due to the load, the bimetal 9 will heat up and bend. . In addition, due to an accident, the electric circuit was damaged by approximately 1 times the rated current.
When the short-circuit wL current flows, the bimetal 9 operates 1
At 11, the 1-lunger 26 of the short-circuit sensor A is instantly attracted to the fixed iron core 25. Bimetal 9 and plunger 26
Due to the operation, the tripping link 19 moves in one direction In+,
Triplink 18 is released from Sochi. Therefore, the slit formed in the l lip link 18) 181m
becomes horizontal, the shaft 17a of the third link 17 engaged with the slit 18a is moved by the urging force of the return spring 14, and the third link 17 and the link 15 of WJl are moved to the left, As a result, the movable contact 7 is opened, and the dead center of the second link 6 moves, so the handle 21 is turned to the left! I! 'l L, the connecting shaft 29 is supported in a neutral position by being engaged with a trip indicator (not deliberately omitted) formed on the frame 13. During this time, due to the rotation of the trip link 18, the interlocking rod 20
The leg 20a of is pushed and moves l1jl, and the leg 20b located at the other pole pushes the trip link of the other pole to release the trip link.

In addition, by the operation of the plunger 26, the movable contact 7 is directly forcibly opened by a forced opening rod 26a that is integrated with the first plunger 26.

By the way, in the case of a short circuit accident, the 3-pole excitation coil L'rt
e L's e Among the ducks, the one in the center is wound in the opposite direction to the others, so when the S-phase current ■8 is at its maximum, the R-phase and T-phase city'fk IT9 IR are in opposite directions, so the coil The magnetic poles generated at both ends of the L box L'T are oriented in the same direction, and the external magnetic fields of the coil LK cooperate without canceling each other, reducing magnetic loss. The other coil L'r.

The same relationship holds when L/, □ is maximum. Therefore, the breaking performance of the phase through which the maximum current flows or the breaking performance of the phase that is difficult to protect can be improved.

As described above, the 3-phase 3fflJ (It river fire breaker) of the present invention has the middle excitation coil wound in the opposite direction to the other coils, which reduces the magnetic loss of the coils due to mutual influence on the simple structure. This has the effect of improving the breaking performance.

[Brief explanation of the drawing]

Figure 1 is a wiring diagram for connecting the electric circuit in the 11th short circuit accident in the conventional example.
Fig. 2 is a three-phase current waveform diagram, Fig. 3 is a sectional view of an embodiment of the present invention, and Fig. 4 is a wiring diagram showing the electric circuit at the time of an accident. A...Short circuit sensor, L's v L'Rt T-'T
... Excitation coil (6)

Claims (1)

[Claims] An electromagnetic short-circuit sensor is provided for each line of the three-phase line to detect a short-circuit Y1, and these short-circuit sensors are arranged in parallel with each other, and the excitation coil of the short-circuit sensor located in the middle is connected to the excitation coil of another short-circuit sensor. A 3-phase 3-wire circuit breaker with reverse winding.