JPS6242429Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to, for example, an improvement in a high-speed shingle breaker tripping control circuit.

A conventional circuit of this type is shown in FIG. In the figure, 1 is a DC power supply, 2 is a resistor that limits the current of the DC power supply 1, 3 is a main contact of a high-speed disconnector (hereinafter referred to as HP), and 31 is an auxiliary switch that works with the main contact 3 of the HP. , a contact that opens and closes in the same way as the main contact 3 opens and closes (hereinafter referred to as the a-contact), 4 is a capacitor that is charged from the DC power supply 1 through the resistor 2 and the a-contact 31, and 5 is the HP pull Remove coil,
Reference numeral 6 denotes a thyristor that starts energizing and discharges the charge of the capacitor 4 when a tripping signal is received.

Next, the operation will be explained according to FIG.
FIG. 1A shows that the HP main contact 3 is in an open state, and the a contact 31 linked thereto is also in an open state. When a master controller (not shown) is operated to start the electric vehicle, a current interrupter (not shown) is turned on, and subsequently the main contact 3 of the HP is turned on. Therefore, the a-contact 31 connected to the HP main contact 3 is closed, and the capacitor 4 is charged by the DC power source 1 through the resistor 2 and the a-contact 31 as shown in FIG. When an abnormality such as overvoltage or overcurrent is detected in the main circuit, a firing signal is sent from the control circuit (not shown) to the gate of thyristor 6, and thyristor 6 is fired, as shown in Figure 1 C. Then, the discharge current of the capacitor 4 flows to the trip coil 5 of the HP 3, and the HP 3 performs a disconnection operation and returns to the state shown in FIG. 1A.

However, in this circuit, if an abnormality is detected in the main circuit immediately after the HP3 is turned on, the thyristor 6 is not sufficiently charged to excite the tripping coil 5 and disconnect the HP3. Since current flows continuously from the DC power supply 1 through the HP 3, the capacitor 4 cannot be charged forever, and the main circuit may not be protected by the HP 3, which is a disadvantage in that reliability is greatly lacking.

This invention was made in order to eliminate the drawbacks of the conventional ones as mentioned above.The conventional tripping control circuit is linked to the opening and closing of the main contact of the HP or current interrupter, but when the main contact opens and closes, On the other hand, by adding an auxiliary switch contact that closes and opens in reverse, the purpose is to provide a tripping control circuit that can be disconnected immediately after HP is turned on.

An embodiment of this invention will be described below based on the drawings. In FIG. 2, numerals 1 to 6 and 31 are the same as those conventionally used, so their explanation will be omitted. 3
2 is a second contact that is connected in parallel with the a contact 31 which is the first contact, and is an auxiliary switch contact that operates in conjunction with the main contact 3 of the HP, and performs the closing and opening operations opposite to the opening and closing of the main contact 3. (hereinafter referred to as B contact), and both A contact 31 and B contact 32 are in the open state, although it is for a short time during the opening/closing operation.
That is, the a-contact 31 and the b-contact 32 are designed so that their closed states do not overlap.

Next, the operation will be explained with reference to FIG. As shown in FIG. 2A, when the HP main contact 3 is open, the capacitor 4 is charged through the b contact 32. Now, when the main controller (not shown) is operated to turn on the HP, even if some abnormality is detected in the main circuit and the HP must be immediately released, the capacitor 4 is still charged. , as shown in Figure 2B, a tripping signal comes to the gate of the thyristor 6, the thyristor fires, the tripping coil 5 is excited, and the HP is immediately activated.
The main contact 3 then moves to the cutting operation. In this case, even if the gate signal disappears and the charge in the capacitor 4 is discharged from the thyristor 6, which has been fired once, as shown in FIG. There is a need to cut it off. This is shown in Figure 2 D.
Since the main contact 3 of the HP is in the middle of opening, both the a contact 31 and the b contact 32 are open, albeit for a short time, so the above requirements can be met, and the state returns to the state shown in Fig. 2 A, and the capacitor 4 is reconnected. It becomes possible to start charging.

In addition, in the above embodiment, HP is used as an auxiliary switch.
Although the one using the a contact 31 and the b contact 32 interlocking with the main contact 3 is shown,
Contact a and b connected in series with the main contact 3 of the HP, connected to a current interrupter (not shown) that is closed immediately before the main contact 3 of the HP is closed, and opened immediately after the main contact 3 of the HP is opened. Contacts (both not shown) may be used;
The same effects as in the above embodiment are achieved.

As described above, according to this invention, the auxiliary switch, that is, the first
Since the tripping control circuit is formed by connecting the second contact (a contact) and the second contact (b contact) in parallel, it is possible to obtain a tripping control circuit with significantly improved reliability at low cost.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the relationship between the operation of a conventional switch trip circuit and the switch main contact, and Figure 2 is a diagram showing the relationship between the switch trip circuit and the switch main contact according to an embodiment of this invention. FIG. 3 is a diagram showing the relationship between operations. In the figure, 1 is a DC power supply, 2 is a resistor, 3 is the main contact of the high speed shunt breaker, 31 is the first contact, 32 is the second contact, 4 is the capacitor, and 5 is the high speed shunt breaker. The tripping coil 6 is a thyristor.

Claims (1)

[Scope of utility model registration request] Consists of a DC power source, a resistor that limits the current from this DC power source, an auxiliary switch that is linked to the main contact of a high-speed circuit breaker or current circuit breaker, and a capacitor that is charged from the DC power source through the resistor. a first closed circuit, and a second circuit comprising the capacitor, a tripping coil of the high-speed disconnector, and a thyristor connected to discharge the charge stored in the capacitor when a tripping signal is received. In a trip control circuit having a closed circuit,
The auxiliary switch is connected to a first contact that opens when the main contact of the high speed breaker or current breaker is in the open state, and in parallel with the first contact so that the first contact and the closed state do not overlap. A tripping control circuit for a switch, characterized in that the circuit comprises a second contact that is connected to the high speed breaker or current breaker and closes when the main contact of the high speed breaker or current breaker is in an open state.