10kV circuit breaker closing and locking loop

Abstract

The utility model relates to a 10kV circuit breaker closing and locking loop, and belongs to the field of high-voltage circuit breaker control. According to the utility model, a normally open micro contact S2 of a closing locking coil Y1 is connected to an alarm loop through an impact relay CJ, and the alarm loop is also connected in parallel with a sound release button TA. According to the utility model, the normally open micro contact of the closing and locking coil with improved wiring is connected to the closing loop, and the alarm electric whistle loop is additionally arranged, so that electrical personnel can timely and accurately find out circuit faults caused by burning of the closing and locking coil and timely replace the closing and locking coil, and the sound equipment is removed by additionally arranging the sound equipment removing button, so that the safety of the circuit is improved. And long-time sounding of the electric whistle is avoided.

Description

Technical Field

[0001] The utility model belongs to the field of high-voltage circuit breaker control, and in particular relates to a closing and locking circuit of a 10kV circuit breaker. Background Art

[0002] In the prior art, the conventional wiring of the 10kV circuit breaker closing lockout circuit is as follows: Figure 1 As shown, it includes the trolley working contact S9, the trolley test contact S8, the micro-movement normally open contact S2 of the closing lock coil, the closing lock coil Y1, the closing coil HQ, the closing switch KK on the switch cabinet, the local closing button HA, and the remote-local control switch SA; the remote-local control switch SA includes two linkage contacts, one of which is connected to the closing KK on the switch cabinet, and the other is connected to the local closing HA. The closing KK on the switch cabinet is connected, and the other contact is connected to the local closing HA. The micro-movement normally open contact S2 of the closing lock coil engages the closing coil HQ , the closing switch KK on the switch cabinet is connected in parallel with the local closing switch HA and then connected to the positive pole of the power supply; the trolley working contact S9 and the trolley test contact S8 are connected in parallel and then connected to the closing lock coil Y1 to form a closing lock circuit; when the closing lock coil is always in the energized and attracted state, long-term power-on will cause the coil to burn out, and the staff cannot know that the closing lock coil is burned out in time. They can only wait until the next closing. Because the closing switch cannot work normally, it takes a lot of time and various fault troubleshooting to find out that the closing lock coil is burned out, resulting in long power outage time and low maintenance efficiency. Utility Model Content

[0003] The utility model aims to provide a 10kV circuit breaker closing lockout circuit in view of the deficiencies in the prior art.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a 10kV circuit breaker closing lockout circuit, including a closing lockout relay; the closing lockout relay coil is connected to a first switch and a second switch, and the first switch and the second switch are connected in parallel; the normally open contact of the closing lockout relay is connected to a third switch and a fourth switch, and the third switch and the fourth switch are connected in parallel; the normally closed contact of the closing lockout relay is connected to an impact relay, and the impact relay is connected to an alarm device.

[0005] In order to promptly detect the burning of the closing lockout coil, the normally closed contact of the closing lockout relay is connected to the impact relay, and the impact relay is connected to the alarm device. When the coil burns out and causes power failure, the normally closed micro-contact of the closing lockout relay is connected. At this time, the alarm circuit is connected, and the electrical personnel can replace the closing lockout coil to ensure smooth closing of the circuit breaker and timely power supply.

[0006] Furthermore, in order to prevent the alarm device from working all the time, an alarm release button is added. The alarm release button is connected in parallel with the alarm device. When the alarm device is working, the electrical personnel can press the alarm release button to stop the alarm device from working.

[0007] Furthermore, the alarm device may be an alarm electric whistle.

[0008] Furthermore, the impact relay includes a first relay, a second relay, a third relay, a mutual inductance coil, a first protective resistor, and a second protective resistor; the normally open contact of the first relay is connected to the alarm device, the coil of the first relay is connected to the normally open contact of the third relay, one end of the coil of the second relay is connected to the first protective resistor, and the other end is connected to the alarm release button, the primary side of the mutual inductance coil engages the normally closed contact of the gate locking relay, one end of the third relay coil is connected to the normally closed contact of the second relay, and the other end is connected to the second protective resistor; one end of the secondary side of the mutual inductance coil is connected between the normally closed contacts of the third relay coil and the second relay, and the other end is connected between the third relay coil and the second protective resistor; the branch where the first relay coil is located and the branch where the third relay coil is located are connected in parallel.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] (1) By connecting the normally closed contacts of the closing lockout relay to an alarm device, electrical personnel can promptly and accurately detect circuit faults caused by the burning of the closing lockout coil and replace the closing lockout coil in a timely manner.

[0011] (2) By adding an alarm release button to the alarm device, the alarm device is prevented from working all the time.

[0012] (3) It avoids the situation that when the circuit breaker trolley switches between the test position and the working position, the closing lock coil loses power in a short period of time, causing the micro-motion normally open contact to close, which will cause harm to the closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the wiring diagram of the conventional closing and locking circuit before modification;

[0014] Figure 2 This is the wiring diagram after the closing and locking circuit is modified;

[0015] Figure 3 This is the internal circuit schematic of the impact relay.

[0016] Among them, SA, remote-local control switch; KK, closing switch on the high-voltage circuit breaker switch cabinet; HA, local closing button of the high-voltage circuit breaker; S9, trolley working contact; S8, trolley test contact; S2, micro-normally open contact of the closing lock coil; Y1, closing lock coil; HQ, closing coil; FM, alarm whistle; TA, alarm release button; CJ, impact relay; ZJ, output relay and its normally open contact; FJ, reset relay and its normally closed contact; BL, excitation coil; GHJ, reed relay; Rf2, protective resistor. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0018] Figure 1 This is a wiring diagram of a closing lockout circuit before modification provided by this embodiment. The conventional wiring of the closing circuit of a 10kV circuit breaker is used. The micro-contact S2 (normally open point) of the lockout coil Y1 is connected in series in the closing circuit. The function of the closing lockout is to prevent the circuit breaker trolley from causing harm to the closing circuit when it is between the test position and the working position. Figure 1 It can be seen that the closing lock coil is always in the energized state, and the coil burns out from time to time. Of course, if the closing lock coil burns out, the closing lock coil can be replaced to keep the original closing circuit unchanged. However, the staff is not aware of the burning of the closing lock coil. It is necessary to wait until the next time when the closing fails to close, and through various troubleshooting, it may take a lot of time to find out that the closing lock coil Y1 is burned out, resulting in a long power outage.

[0019] Since the usage of 10kV circuit breakers is very large, power supply failures caused by the burning of the closing lock coil often occur. In order to detect the burning of the closing lock coil in time, the normally closed micro-contact S2 of the closing lock coil Y1 (connected after the coil loses power) is connected to the alarm circuit, and the fault bell is used to notify the electrical personnel to replace the closing lock coil Y1, which saves a lot of troubleshooting time and allows the planned replacement of the burned closing lock coil to ensure reliable power supply. The improved wiring diagram is as follows Figure 2, including trolley working contact S9 (i.e. the first switch), trolley test contact S8 (i.e. the second switch), closing lock coil micro-open contact S2, closing lock coil Y1, closing coil HQ, closing contact KK on the switch cabinet (i.e. the third switch), local closing contact HA (i.e. the fourth switch), remote-local control switch SA; the remote-local control switch SA includes two linkage contacts, one of which is connected to the closing KK on the switch cabinet, and the other is connected to the local closing HA. The closing switch KK is connected, and the other contact is connected to the local closing switch HA. The micro-moving normally open contact S2 of the closing lock coil engages the closing coil HQ. The closing switch KK on the switch cabinet is connected in parallel with the local closing switch HA and then connected to the positive pole of the power supply; the trolley working contact S9 and the trolley test contact S8 are connected in parallel and then connected to the closing lock coil Y1 to form a closing lock coil circuit. When the closing lock coil fails, the micro-moving contact of the closing lock coil (normally closed at this time) is connected to the impact relay, and the alarm device FM (i.e., the alarm electric whistle) is started to notify the electrical personnel. To avoid the long sound of the electric whistle, the electrical personnel can press the alarm release button TA to stop the electric whistle from sounding. Next, the burned closing lock coil is replaced through a plan. Ensure smooth closing of the circuit breaker and timely power supply.

[0020] Figure 3 : is the internal wiring diagram of the impact relay of the utility model. In this embodiment, the output relay ZJ (i.e., the first relay), the reset relay FJ (i.e., the second relay), the reed relay GHJ (i.e., the third relay), as shown in FIG. Figure 3 As shown, the working principle of impact relay CJ: BL primary coil is connected to the DC signal circuit. When the auxiliary contact S2 (normally closed) of the circuit breaker closing lock coil Y1 is connected due to the loss of power to Y1, current will flow through the BL primary coil, and there will be an induced potential in the secondary winding of BL. This potential will generate current in the reed relay GHJ, and its normally open contact GHJ will close, starting the output relay ZJ. The normally open contact of ZJ will close and turn on the electric whistle. Press the sound release button TA, and after the reset relay FJ is connected to the DC voltage, its normally closed contact FJ will open, causing the relay GHJ to lose power, the normally open contact of the relay GHJ will open, the output relay ZJ will lose power, and the normally open contact of the output relay ZJ will open, cutting off the electric whistle.

[0021] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

Claims

1. A 10kV circuit breaker closing lockout circuit, comprising a closing lockout relay; a closing lockout relay coil is connected to a first switch and a second switch, and the first switch and the second switch are connected in parallel; a normally open contact of the closing lockout relay is connected to a third switch and a fourth switch, and the third switch and the fourth switch are connected in parallel; characterized in that: The normally closed contact of the closing and locking relay is connected to the impact relay, and the impact relay is connected to the alarm device.

2. The 10kV circuit breaker closing lockout circuit according to claim 1, characterized in that: It also includes an alarm release button, which is connected in parallel with the alarm device.

3. The 10kV circuit breaker closing lockout circuit according to claim 1, characterized in that: The alarm device is an alarm electric whistle.

4. The 10kV circuit breaker closing lockout circuit according to claim 1, characterized in that: The impact relay includes a first relay, a second relay, a third relay, a mutual inductance coil, a first protective resistor, and a second protective resistor; the normally open contact of the first relay is connected to the alarm device, the coil of the first relay is connected to the normally open contact of the third relay, one end of the coil of the second relay is connected to the first protective resistor, and the other end is connected to the alarm release button, the primary side of the mutual inductance coil engages the normally closed contact of the gate locking relay, one end of the third relay coil is connected to the normally closed contact of the second relay, and the other end is connected to the second protective resistor; one end of the secondary side of the mutual inductance coil is connected between the third relay coil and the normally closed contact of the second relay, and the other end is connected between the third relay coil and the second protective resistor; the branch where the first relay coil is located and the branch where the third relay coil is located are connected in parallel.

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