CN205911655U - Lock -up control return circuit - Google Patents

Abstract

The utility model provides a locking control circuit, which controls the power-on and power-off of the first locking small busbar by setting the first locking small busbar and moving the position auxiliary contact through the busbar grounding handcart, so as to control the power in each switch cabinet The power on and off of the first handcart locking device ensures that the busbar grounding handcart locks the handcarts in each switch cabinet during maintenance. Extended auxiliary contacts are provided to each switch cabinet without resetting the relay, which simplifies the wiring and avoids the defect that the resetting relay is easily affected by multiple power failures, meets the requirements of preventing electrical misoperation, and saves a lot of controls at the same time cables, improving the safety and economy of the locking control loop.

Description

a locked control loop

technical field

The utility model relates to the technical field of electric equipment, in particular to a locking control loop.

Background technique

The busbar grounding handcart is generally installed in the voltage transformer cabinet (PT cabinet), and the voltage transformer cabinet (PT cabinet) is equipped with auxiliary contacts and secondary wiring of the voltage transformer handcart and the busbar grounding handcart. Pull out the busbar grounding handcart from the voltage transformer cabinet (PT cabinet) during normal operation, push the voltage transformer handcart into it for metering or measurement work; pull out the voltage transformer handcart during maintenance, and put the busbar grounding handcart The cart is pushed into the potential transformer cabinet (PT cabinet) to ground the busbar reliably, which improves the work efficiency during maintenance.

It can be seen that the busbar grounding handcart is an indispensable safety device to ensure the safety of personnel during the maintenance of high-voltage power distribution equipment. It is safe and reliable, ensuring that there will be no misoperations such as operating the grounding switch with electricity or transmitting power when the grounding switch is closed. At present, the bus live indicator is often used to block the bus grounding handcart to prevent the grounding knife switch from being closed when the bus is live; on the other hand, the auxiliary contact of the bus grounding handcart is used to block other handcarts to prevent the grounding wire from closing. But the above-mentioned scheme has the following defects: (1) when the charged display breaks down, it may cause the grounding switch to be closed under the live situation of the busbar; The bus is not charged, it is safe to close the grounding switch at this time, but once the bus is restored to power, it is often easy to ignore the fact that the grounding switch has been grounded, resulting in accidents; (3) because the switchgear on a section of the bus is relatively There are many, but the auxiliary contacts of the bus grounding handcart itself are limited, it is necessary to provide extended auxiliary contacts to other switch cabinets on the bus through the reset relay, and connect other handcarts in series to the auxiliary contacts of the bus grounding handcart. In the closed control loop formed. However, expanding the auxiliary contacts through the reset relay is easily affected by the power failure of multiple power sources, and does not meet the requirements for preventing electrical misoperations. At the same time, a large number of cables are required for wiring, which is poor in safety and economy.

Utility model content

The technical problem to be solved by the utility model is that the locking control circuit in the prior art needs to expand the auxiliary contacts through the reset relay, and the wiring is too many and does not meet the requirements of preventing electrical misoperation, and the safety and economy are poor.

Another technical problem to be solved by the utility model is that the locking control circuit in the prior art needs to lock the busbar grounding handcart through the live display, which has potential safety hazards.

For this reason, the utility model embodiment provides following technical scheme:

The utility model provides a locking control circuit, comprising: a control small busbar, a first locking small busbar, at least two busbar grounding handcart removal position auxiliary contacts and a plurality of first handcart locking devices;

The positive pole line of the control small busbar is connected to the positive power supply, and the negative pole line is connected to the negative power supply;

The positive and negative lines of the first locking small bus are respectively connected to the positive and negative lines of the control small bus through the corresponding auxiliary contacts of the bus grounding handcart removed from the position;

The busbar grounding handcart moves away the position auxiliary contact, which is set in the voltage transformer cabinet (PT cabinet) on the small control bus, and when the busbar grounding handcart pulls out the voltage transformer cabinet (PT cabinet) closure;

The first handcart locking device is distributed in other switch cabinets on the control small busbar except the voltage transformer cabinet (PT cabinet), and the two ends of each of the first handcart locking devices are respectively connected to The positive pole line and the negative pole line of the first locking small busbar are connected, and the handcart of the switch cabinet where it is located is locked when the power is cut off.

The locking control circuit described in the utility model includes 4 busbar grounding handcart removal position auxiliary contacts, and after every two busbar grounding handcart removal position auxiliary contacts are connected in parallel, they are connected to the positive electrodes of the control small busbars respectively line and the positive line of the first blocking small bus, and the negative line of the control small bus and the negative line of the first blocking small bus.

In the locking control circuit described in the utility model, the first handcart locking device includes a first handcart locking electromagnet, which is installed in the cabinet door of its corresponding switch cabinet, and each of the first handcart locking electromagnets When the power is off, the handcart corresponding to the switch cabinet is locked.

In the locking control circuit described in the utility model, the first locking small bus bar is arranged on the top of the switch cabinet and the voltage transformer cabinet (PT cabinet).

In the locking control circuit described in the utility model, the switch cabinet includes at least one of an incoming line cabinet, a line outgoing line cabinet, a grounding transformer outgoing line cabinet, a capacitor outgoing line cabinet, a segmented lifting cabinet and a segmented cabinet.

The locking control circuit described in the utility model also includes: a second locking small busbar, a plurality of auxiliary contacts for other handcart test positions and a second locking device;

Each of the other handcart test position auxiliary contacts corresponds to a handcart in the switch cabinet, and when the corresponding handcart is in the working position, the other handcart test position auxiliary contacts are disconnected;

The second locking device is arranged in the voltage transformer cabinet (PT cabinet), and locks the busbar grounding handcart when the power is off;

The auxiliary contacts of the other handcart test positions and the second locking device are connected in series to the second locking small busbar, and when all the other handcart test position auxiliary contacts are closed, the control small busbar, the other A closed circuit is formed among the auxiliary contact of the test position of the handcart, the second locking device and the second locking small busbar, and current flows through the second locking device.

In the locking control circuit described in the utility model, the second locking device includes a second handcart locking electromagnet, which is installed in the cabinet door of the voltage transformer cabinet (PT cabinet), and the second handcart is locked When the electromagnet is powered off, the busbar grounding handcart is locked.

In the locking control circuit described in the utility model, the second locking small bus bar is arranged on the top of the switch cabinet and the voltage transformer cabinet (PT cabinet).

The locking control circuit described in the utility model also includes a bus charging indicator installed on the voltage transformer cabinet (PT cabinet) and connected in series with the second locking device.

The locking control circuit described in the utility model also includes a first power switch device and a second power switch device;

The first power switch device is used to turn on or cut off the power supply of the control small busbar to the auxiliary contact of the removed position of the busbar grounding handcart;

The second power switch device is used to turn on or cut off the power supply from the control small bus to the second locking small bus.

The technical scheme of the utility model has the following advantages:

The utility model provides a locking control circuit, which controls the power-on and power-off of the first locking small busbar by setting the first locking small busbar and moving the position auxiliary contact through the busbar grounding handcart, so as to control the power in each switch cabinet The power on and off of the first handcart locking device ensures that the busbar grounding handcart locks the handcarts in each switch cabinet during maintenance. Extended auxiliary contacts are provided to each switch cabinet without resetting the relay, which simplifies the wiring and avoids the defect that the resetting relay is easily affected by multiple power failures, meets the requirements of preventing electrical misoperation, and saves a lot of controls at the same time cables, improving the safety and economy of the locking control loop.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is a schematic circuit diagram of a specific example of the locking control loop in the embodiment of the present invention.

Reference signs:

1-Control small busbar; 2-First locking small busbar; 3-Auxiliary contact at busbar grounding handcart removal position; 4-First handcart locking device; 5-Second locking small busbar; 6-Other handcart test positions Auxiliary contact; 7-second locking device; 8-charged display; 9-first power switch device; 10-second power switch device.

detailed description

The technical solutions of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, or it can be the internal communication of two components, it can be wireless connection, or it can be wired connection. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

The embodiment of the utility model provides a locking control circuit, as shown in Figure 1, including: a control small bus 1, a first locking small bus 2, at least two bus grounding handcart removal position auxiliary contacts 3 and a plurality of first First-hand car locking device4.

Control small busbar 1, its positive pole line is connected to positive power supply, and its negative pole line is connected to negative power supply.

The positive and negative lines of the first locking small busbar 2 are respectively connected to the positive and negative pole lines of the control small busbar 1 through the corresponding busbar grounding handcart removed position auxiliary contact 3.

Auxiliary contact 3 is set in the voltage transformer cabinet (PT cabinet) on the control small bus 1 when the busbar grounding trolley is removed from the position, and is closed when the busbar grounding trolley is pulled out of the voltage transformer cabinet (PT cabinet).

The first handcart locking device 4 is distributed in switch cabinets other than the voltage transformer cabinet (PT cabinet) on the control small busbar 1, and the two ends of each first handcart locking device 4 are respectively connected to the first locking small busbar 2, the positive and negative wires are connected, and the handcart of the switch cabinet where it is located is locked when the power is cut off.

Specifically, during normal operation, the busbar grounding handcart is pulled out from the voltage transformer cabinet (PT cabinet) on the control small busbar 1 (the busbar to be overhauled), and the auxiliary contact 3 at the position where the busbar grounding handcart is removed is closed The positive line of the control small bus 1 is electrically connected to the positive line of the first blocking small bus 2, the negative line of the control small bus 1 is electrically connected to the negative line of the first blocking small bus 2, and the first blocking small bus 2 is powered on. Because the two ends of the first handcart locking device 4 are respectively connected to the positive and negative pole lines of the first locking small busbar 2, at this moment, current flows through each first handcart locking device, and each switch cabinet is unlocked, and each switch The handcart in the cabinet can enter the working position for normal use; during maintenance, the busbar grounding handcart is pushed into the voltage transformer. At this time, the busbar grounding handcart moves away from the position and the auxiliary contact 3 is disconnected, and the first locking small busbar 2 is powered off, so that The first handcart locking device 4 corresponding to each switchgear is also powered off, and the handcart in the switchgear is locked so that the handcart cannot enter the working position for normal use, ensuring that there will be no misoperations such as power transmission when the grounding switch is closed.

The locking control circuit in this embodiment controls the power-on and power-off of the first locking small busbar by setting the first locking small busbar and moving the position auxiliary contact through the busbar grounding trolley, so as to control the first locking busbar in each switch cabinet. The power on and off of the handcart locking device ensures that the busbar grounding handcart locks the handcarts in each switch cabinet during maintenance. Extended auxiliary contacts are provided to each switch cabinet without resetting the relay, which simplifies the wiring and avoids the defect that the resetting relay is easily affected by multiple power failures, meets the requirements of preventing electrical misoperation, and saves a lot of controls at the same time cables, improving the safety and economy of the locking control loop.

Preferably, the locking control loop in this embodiment includes 4 auxiliary contacts 3 for removing the position of the bus grounding handcart, and after every two auxiliary contacts 3 for removing the position of the bus grounding handcart are connected in parallel, they are then respectively connected to control the small busbars 1 and the positive line of the first blocking small bus 2, and the negative line of the control small bus 1 and the negative line of the first blocking small bus 2. Specifically, by adding auxiliary contacts connected in parallel to the removed position of the busbar grounded trolley, even if one of the auxiliary contacts of the removed position of the busbar grounded trolley is damaged, the auxiliary contact of the removed position of the busbar grounded trolley connected in parallel with it will effectively control the first locking The power-on and power-off of the small busbar 2 improves the stability of the locking control of the busbar grounding handcart.

Preferably, in the locking control circuit in this embodiment, the first handcart locking device 4 includes a first handcart locking electromagnet, which is installed in the cabinet door of its corresponding switch cabinet, and each first handcart locking electromagnet is switched off. When the power is turned on, the handcart corresponding to the switch cabinet is locked. Specifically, when the first locking small busbar 2 is powered off, the first handcart locking electromagnets of each switchgear are powered off, and the handcarts of the corresponding switchgears are locked, so that the handcarts cannot enter the working position for normal use, ensuring Electrical locking of busbar grounding handcarts to each switchgear handcart.

Preferably, in the locking control circuit in this embodiment, the first locking small busbar 2 is arranged on the top of the switch cabinet and the potential transformer cabinet (PT cabinet). Easy wiring.

Preferably, in the locking control loop in this embodiment, the switch cabinet includes at least one of an incoming line cabinet, a line outgoing line cabinet, a grounding substation outgoing line cabinet, a capacitor outgoing line cabinet, a segmented lifting cabinet, and a segmented cabinet. Maintenance is safe, efficient and convenient, ensuring the stable operation of the power grid and power grid equipment.

Preferably, the locking control loop in this embodiment further includes: a second locking small busbar 5 , a plurality of other auxiliary contacts 6 for handcart test positions, and a second locking device 7 .

Each auxiliary contact 6 of the test position of the other handcart corresponds to a handcart in the switch cabinet, and when the corresponding handcart is in the working position, the auxiliary contact 6 of the test position of the other handcart is disconnected.

The second locking device 7 is arranged in the voltage transformer cabinet (PT cabinet), and locks the busbar grounding trolley when the power is cut off.

The auxiliary contact 6 of other handcart test positions and the second locking device 7 are connected in series to the second locking small bus 5, and when all the other handcart test position auxiliary contacts 6 are closed, the small bus 1 and other handcart test position auxiliary contacts are controlled. A closed loop is formed between the contact point 6 , the second locking device 7 and the second locking small busbar 5 , and a current flows through the second locking device 7 .

Specifically, during normal operation, the handcart in the switch cabinet is in the working position, and the corresponding auxiliary contact 6 of other handcart test positions is disconnected, because the auxiliary contact 6 of other handcart test positions and the second locking device 7 are connected in series For the second locking small busbar 5, once the auxiliary contact 6 of some other handcart test position is disconnected, control the small busbar 1, other handcart test position auxiliary contact 6, the second locking device 7 and the second locking small busbar 5. A closed loop cannot be formed, that is, the second locking device 7 is powered off, and the bus grounding handcart is electrically blocked; during the test and maintenance, the handcart in the switch cabinet is out of the working position, and the corresponding auxiliary contact 6 of other handcart test positions is closed. As shown in Figure 1, the current returns from the positive line of the control small bus 1 to the negative line of the control small bus 1 through the auxiliary contacts SW1, SW3, SW2 and the second locking device 7 of other handcart test positions, forming a closed loop. When current flows through the second locking device 7, the busbar grounding handcart is electrically unlocked, and can be normally pushed into the working position to reliably ground the busbar. Make sure that there will be no misoperation such as live operation and grounding switch.

The locking control loop in this embodiment can be formed by the first control line 1, the second locking small busbar 5, the auxiliary contacts of other handcart test positions corresponding to each switch cabinet, and the second locking device 7 even if the charged display fails. The series circuit provides the locking of the busbar grounding handcart, avoiding the potential safety hazard caused by the damage of the charged display.

Preferably, in the locking control circuit in this embodiment, the second locking device 7 includes the second handcart locking electromagnet, which is installed in the cabinet door of the voltage transformer cabinet (PT cabinet), and the second handcart locking electromagnet is disconnected. When the power is on, the busbar grounding handcart is locked and cannot enter the working position, so as to ensure that there will be no misoperation of the live grounding switch.

Preferably, in the locking control loop in this embodiment, the second locking small busbar 5 is arranged on the top of the switch cabinet and the potential transformer cabinet (PT cabinet). Easy wiring.

Preferably, the locking control loop in this embodiment further includes a bus live indicator 8 installed on a potential transformer cabinet (PT cabinet) and connected in series with the second locking device 7 . When the busbar where the switchgear is located is charged, the two contacts in the busbar charging indicator 8 are disconnected, which can further ensure the control of the small busbar 1, the auxiliary contact 6 of other handcart test positions, the second locking device 7 and the second locking small busbar 5 It will not be able to form a closed loop between them, so that the busbar grounding handcart is locked, which effectively prevents misoperations such as live operation of the grounding switch.

Preferably, the locking control loop in this embodiment further includes a first power switch device 9 and a second power switch device 10 .

The first power switch device 9 is used to turn on or cut off the power supply for controlling the small busbar 1 to the auxiliary contact 3 at the removal position of the busbar grounding trolley.

The second power switch device 10 is used for turning on or cutting off the power supply from the control small bus 1 to the second locking small bus 5 .

Specifically, as shown in Figure 1, the first power switch device 9 includes switches QF1 and QF2. When the switches QF1 and QF2 are closed, the small busbar 1 is controlled to move away from the busbar grounding trolley and the position auxiliary contacts YW1, YW2, and YW3 It is electrically connected with YW4. When the switches QF1 and QF2 are disconnected, even if the busbar grounding handcart is pulled out of the voltage transformer cabinet (PT cabinet), the auxiliary contacts YW1, YW2, YW3 and YW4 are closed when the busbar grounding handcart moves away. Blocking the small busbar 2 will not be powered on, so that the busbar grounding handcart can be connected or cut out according to the demand. The second power switch device 10 includes switches QF3 and QF4. When QF3 and QF4 are disconnected, even other handcarts The auxiliary contacts SW1, SW2, SW3 and SW4 of the vehicle test position are fully closed, and a closed loop cannot be formed between the control small bus 1, the auxiliary contact 6 of other handcart test positions, the second locking device 7, and the second locking small bus 5. No current will flow through the second locking device 7, and only when the switches QF3 and QF4 are closed, can a closed loop be formed, so that the switchgear handcart locking protection can be connected or cut out according to requirements. The switches in the first power switch device 9 and the second power switch device 10 can be two air switches or two knife switches, preferably, they can also be double-pole single-throw switches, which can further simplify wiring.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the scope of protection of the utility model.

Claims (10)

1. A locking control loop, characterized in that it includes: a control small busbar (1), a first locking small busbar (2), at least two busbar grounding handcart removal position auxiliary contacts (3) and a plurality of first Handcart locking device (4); The control small busbar (1), its positive pole line is connected to the positive power supply, and its negative pole line is connected to the negative power supply; The positive pole line and negative pole line of the first locking small busbar (2) are moved away from the position auxiliary contact (3) and the positive pole line and negative pole line of the control small busbar (1) through the corresponding grounding trolley of the busbar respectively. connect; The auxiliary contact (3) is removed from the position of the busbar grounding trolley, and is installed in the voltage transformer cabinet (PT cabinet) on the control small busbar (1), and the voltage transformer is pulled out from the busbar grounding trolley When the cabinet (PT cabinet) is closed; The first handcart locking device (4) is distributed in other switch cabinets on the control small busbar (1) except the voltage transformer cabinet (PT cabinet), each of the first handcart locks Both ends of the device (4) are respectively connected to the positive and negative lines of the first locking small busbar (2), and lock the handcart of the switch cabinet where it is located when the power is cut off. 2. The locking control circuit according to claim 1, characterized in that it includes 4 auxiliary contacts (3) for removing the position of the bus grounding handcart, and every two auxiliary contacts (3) for removing the position of the bus grounding handcart are connected in parallel After the connection, respectively connect the positive line of the control small bus (1) and the positive line of the first blocking small bus (2), and the negative line of the control small bus (1) and the first blocking Negative wire of the small busbar (2). 3. The locking control circuit according to claim 1, characterized in that, the first handcart locking device (4) comprises a first handcart locking electromagnet installed in the cabinet door of its corresponding switch cabinet, and every When the first handcart locking electromagnet is powered off, the handcart corresponding to the switch cabinet is locked. 4. The locking control circuit according to claim 1, characterized in that, the first locking small busbar (2) is arranged on the top of the switch cabinet and the voltage transformer cabinet (PT cabinet). 5. The locking control circuit according to claim 1, wherein the switch cabinet includes at least one of an incoming line cabinet, a line outgoing line cabinet, a grounding transformer outgoing line cabinet, a capacitor outgoing line cabinet, a segmented lifting cabinet and a segmented cabinet A sort of. 6. The locking control circuit according to any one of claims 1-5, characterized in that it also includes: a second locking small busbar (5), a plurality of other handcart test position auxiliary contacts (6) and a second locking device (7); Each of the other handcart test position auxiliary contacts (6) corresponds to a handcart in the switch cabinet, and when the corresponding handcart is in the working position, the other handcart test position auxiliary contacts (6) are disconnected ; The second locking device (7) is arranged in the voltage transformer cabinet (PT cabinet), and locks the busbar grounding handcart when the power is off; The other handcart test position auxiliary contacts (6) and the second locking device (7) are connected in series to the second locking small busbar (5), and all other handcart test position auxiliary contacts (6) When closed, a closed loop is formed between the control small busbar (1), the auxiliary contact point (6) of the other handcart test position, the second locking device (7) and the second locking small busbar (5), A current flows through the second blocking means (7). 7. The locking control circuit according to claim 6, characterized in that, the second locking device (7) comprises a second handcart locking electromagnet installed on the cabinet door of the voltage transformer cabinet (PT cabinet) and when the second handcart locking electromagnet is de-energized, the bus bar grounding handcart is locked. 8. The locking control circuit according to claim 6, characterized in that, the second locking small busbar (5) is arranged on the top of the switch cabinet and the voltage transformer cabinet (PT cabinet). 9. The locking control circuit according to claim 6, characterized in that, it also includes a bus charging indicator (8), installed on the voltage transformer cabinet (PT cabinet), and connected with the second locking device (7 ) connected in series. 10. The locking control loop according to any one of claims 7-9, further comprising a first power switch device (9) and a second power switch device (10); The first power switch device (9) is used to turn on or cut off the power supply of the control small busbar (1) to the auxiliary contact (3) of the removed position of the busbar grounding handcart; The second power switch device (10) is used for turning on or cutting off the power supply from the control small bus (1) to the second locking small bus (5).