JPS6237311Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a control circuit for an insulator breaker, and in particular, an insulator breaker in which a tripping operation circuit is controlled by two power sources. related to the control circuit.

[Technical background of the invention and its problems] Due to the severity and importance of its responsibilities, the circuit breaker generally has two control circuits, each with its own trigger. A method is used to excite the removed coil. In addition, this breaker is equipped with a gas pressure relay that detects the gas pressure of SF ₆ gas, which is the arc extinguishing fluid, and activates the tripping coil only when the gas pressure is within a specified value. There is. For this reason, the gas shutoff switch is provided with a trip operation circuit and a pressure value monitoring contact amplification circuit that is linked to the gas pressure relay.

Conventionally, a circuit as shown in FIG. 1A has been generally used as a tripping circuit for such a disconnector. That is, this conventional control circuit includes a first series of power supplies P1, N1 and a second series of power supplies P2, N2. In the first series power supply, the breaker tripping coil TC1 is connected to the gas pressure relay PS.
It is connected in series with the b contact 1 of the contact amplifying auxiliary relay X. Moreover, the tripping coil TC2 and the b contact 2 of the auxiliary relay X for contact amplification of the gas pressure relay PS are connected to the power source of the second series, as in the first series. These first series and second series power supplies are provided with contacts S1 and S2 of the breaker auxiliary switch in series with the tripping coils TC1 and TC2, respectively. On the other hand, as an example, a gas pressure relay is installed between the power supplies P1 and N1 of the first series.
PS is connected, and an auxiliary relay X for contact amplification is provided in series with this gas pressure relay PS. The contact amplifying auxiliary relay X of the gas pressure relay PS is provided with a tripping lock value alarm contact 3 that interlocks with the b contacts 1 and 2 thereof.

In this conventional circuit breaker control circuit, trip coils TC1 and TC2 are normally operated by opening and closing contacts S1 and S2 of the shield breaker auxiliary switch, thereby causing the circuit breaker to disconnect. Have the students perform the opening and closing operations of the vessel. In this case, the b contacts 1 and 2 of the contact amplification auxiliary relay You won't be disappointed. Next, when the gas pressure of the SF ₆ gas, which is the arc-extinguishing fluid, is outside the specified value, the gas pressure relay PS senses the abnormality in the gas pressure, and the gas pressure relay PS is turned ON. Then, the contact amplification auxiliary relay OFF, and it becomes impossible to operate the shield breaker despite operating the contacts S1 and S2 of the shield breaker auxiliary switch.
The breaker becomes locked. At the same time, contact 3 for tripping lock value alarm, which is interlocked with b contacts 1 and 2 of contact amplification auxiliary relay X, is turned on and an alarm is issued.

Conventional control circuits for such conventional power switches have the advantage of being simple and inexpensive because only one gas pressure relay PS is required, but the gas pressure relay is only connected to one system of power supply. Because it is
If the power supply for that series (the first series in the diagram) is out of power, the gas pressure relay becomes inoperable, and the gas pressure value at the breaker cannot be monitored. There was a risk that the arc would not be extinguished sufficiently when the arc was cut off because the device would be tripped.

In order to improve this, as shown in Figure 1B,
It is conceivable to connect a gas pressure relay PS to each power supply system and make the contact amplification circuit into two systems. However, as shown in Figure 1B, providing the pressure relay PS on both the power supply sides of the first and second series requires two pressure relays that are expensive and have a complicated structure, which reduces the overall control circuit. This method has the drawbacks of increasing complexity and equipment costs.

[Purpose of the invention] The present invention was proposed in order to solve the drawbacks of the conventional control circuit for gas relays and disconnectors as described above.The purpose of the invention is to use one pressure relay, Furthermore, even if one of the two power supplies fails, the tripping operations of both series can be locked, making it highly reliable, simple in structure, and economical. An object of the present invention is to provide a control circuit for a shattered breaker having a breaker.

[Summary of the invention] The control circuit for the gas pressure switch of the invention connects an auxiliary relay for power failure detection to one of the two power supply circuits, and also connects one gas pressure relay and the auxiliary relay connected in series to this. The auxiliary relay for contact amplification is connected in parallel to the power supplies of the first series and the second series via the make contact and the break contact of the auxiliary relay for power failure detection, and the power supply of one series In the event of a power outage, it is detected by the auxiliary relay for power outage detection, and by switching its make contact and break contact, the gas pressure relay and its contact amplification auxiliary relay are connected to the system in which the power outage occurred. It is designed to switch from the power supply to the power supply of the normal series.

[Embodiment of the invention] Next, an embodiment of the invention will be explained in detail based on FIG. 2. Note that the same parts as those of the conventional control circuit shown in FIG. 1 will be described with the same reference numerals.

Between the power supplies P1 and N1 of the first series, there is an auxiliary relay Y for power failure detection that detects a power failure of the first series power supply.
is connected. On the other hand, one gas pressure relay
PS has an auxiliary relay X for contact amplification in series with this.
are connected to these gas pressure relays PS
and contact amplification auxiliary relay X are first series power supply P
1, N1 and the second series power supplies P2, N2, respectively. In this case, the make contact Ym and the break contact Yb of the power failure detection auxiliary relay Y are inserted between the gas pressure relay PS and the first and second series power supplies. In other words, the make contact of the auxiliary relay Y for power failure detection
Ym is inserted on the side of the power supplies P1 and N1 of the first series, while break contact Yb is inserted on the side of the power supplies P2 and N2 of the second series.

In addition to such a contact amplifier circuit for pressure monitoring, the control circuit of this embodiment is provided with a tripping operation circuit as in the conventional control circuit. That is, the power supplies P1 and N1 of the first series and P of the second series
2 and N2, the tripping coils TC1 and TC2 of the gas shield breaker, the contacts S1 and S2 of the shield breaker auxiliary switch, and the b contact 1 of the contact amplifying relay X of the gas pressure relay PS, respectively. 2 are connected in series. Further, the contact amplification relay X of the gas pressure relay PS is provided with a tripping lock value alarm contact 3 that interlocks with the b contacts 1 and 2 thereof.

The control circuit of this embodiment has the above-mentioned configuration, and its operation will be explained next.

First, when the voltage of the first series power supply is present, the power failure detection auxiliary relay Y connected to it is energized, so its make contact Ym is in the ON state. Therefore, the gas pressure relay PS connected to this make contact Ym and its contact amplifying auxiliary relay X are connected to the first series of power supplies P1 and N1. In this state, if the gas pressure relay PS detects an abnormality in the pressure of SF ₆ gas, which is the arc extinguishing fluid, the gas pressure relay is turned on, and the contact amplification auxiliary relay X is energized accordingly. the result,
b contacts 1 and 2 of contact amplification auxiliary relay X are OFF
Therefore, tripping coils TC1 and TC2 become locked.

On the other hand, when the first series power supply fails, the power failure detection auxiliary relay Y connected thereto is demagnetized, its make contact Ym is turned OFF, and its break contact Yb is turned ON. As a result, the gas pressure relay PS and its contact amplification auxiliary relay If there is an abnormality in the pressure value, this gas pressure relay PS is activated and locks the trip coils TC1 and TC2. In addition, as the tripping coils TC1 and TC2 are locked due to the excitation of the contact amplifying auxiliary relay X, the tripping lock value alarm contact 3 is also turned ON and an alarm is issued.

The present invention is not limited to the embodiment shown in FIG. 2, and as the pressure relay PS, a pressure relay for operation pneumatic pressure, hydraulic pressure, etc. can be used in addition to the one for detecting the gas pressure of the arc-extinguishing fluid. Also, the third
As shown in the figure, auxiliary relays X1 and X2 for contact amplification are connected in series to a pressure relay PS for arc-extinguishing fluid and a pressure relay PSA for operation air pressure, etc., respectively, and these pressure relays PS and PSA are used to detect the power failure. It is also possible to connect the first series of power supplies P1, N1 and the second series of power supplies P2, N2 in parallel via the make contact Ym and break contact Yb of the auxiliary relay Y. And these contact amplification auxiliary relays X1,
By connecting the b contact of X2 in series to each of the first and second series tripping coils TC1 and TC2, the tripping coils TC1 and TC2 can be locked even if there is an abnormality in the pressure of either one. It is also possible to set it as a state.

[Effects of the invention] As shown in the above embodiments, according to the invention, the number of expensive pressure relays can be limited to one, and even if one of the two power supplies is out of power, the other If there is a power source in the series, pressure values can be monitored, and the tripping coil can be locked in the event of an abnormality. As a result, it is possible to obtain a control circuit for a breaker with a simple circuit configuration and excellent safety.

[Brief explanation of the drawing]

1A and 1B are circuit diagrams showing an example of a conventional control circuit for a breaker, FIG. 2 is a circuit diagram showing an embodiment of a control circuit for a breaker according to the present invention, and FIG. FIG. 2 is a circuit diagram showing another embodiment of the present invention. P1, N1...First series power supply, P2, N2...
...Second series power supply, TC1, TC2...Trip coil, PS...Gas pressure relay, PSA...Pressure relay for operation air pressure, etc., X, X1, X2...Auxiliary relay for contact amplification, Y... Auxiliary relay for power failure detection,
Ym...Make contact, Yb...Break contact.

Claims (1)

[Claims for Utility Model Registration] (1) A pressure relay that connects the tripping circuit of a power supply circuit to two power supply circuits, and detects abnormal pressure of the fluid used in the power supply circuit. In the control circuit of the circuit breaker, the auxiliary relay for contact amplification is connected in series with the auxiliary relay for contact amplification, and the contact of the auxiliary relay for contact amplification is connected in series to the coils of the two series of tripping circuits, respectively. An auxiliary relay for power failure detection is connected to one of the power supplies of the series, and one end of the make contact of this auxiliary relay for power failure detection is connected to the power supply side of the series to which the auxiliary relay for power failure detection is connected, and one end of the break contact is connected to one end of the make contact of the auxiliary relay for power failure detection. is connected to the power supply of the other series, and the other end of the make contact and the other end of the break contact are connected in series to the pressure relay and the auxiliary relay for contact amplification thereof. control circuit. (2) Multiple sets of pressure relays and auxiliary relays for contact amplification connected in series are provided, and these multiple sets of pressure relays and the auxiliary relays for contact amplification are connected to the make contact and break of the auxiliary relay for power failure detection. A control circuit for a shield breaker according to claim 1, which is connected in parallel to the other end of the contact. (3) A control circuit for a heat breaker according to claim 1 or 2, which uses a pressure relay that detects pressure abnormalities in an arc-extinguishing medium.