CN205070271U - During reaching, puts isolated wheelbarrow formula metal enclosed switchgear - Google Patents

Abstract

The utility model relates to the technical field of electric equipment, and discloses an isolated handcart, comprising: a vehicle frame, a rotating mechanism installed in the vehicle frame and a handle outside the vehicle frame, the handle drives the rotating mechanism to rotate, and further includes: The baffle plate and the locking electromagnet installed on the vehicle frame, the baffle plate is movably installed on the vehicle frame, and is located between the rotating mechanism and the locking electromagnet, one end of the baffle plate Hold the rotating mechanism, and the other end cooperates with the locking electromagnet to lock or release the rotating mechanism. Also disclosed is a central metal-enclosed switchgear. The isolation handcart of the utility model is equipped with a locking electromagnet, which locks or releases the rotating mechanism through the locking electromagnet, thereby avoiding the safety hazard caused by the isolation handcart being accidentally pushed into or pushed out of the lifting cabinet when the bus tie circuit breaker is closed. question.

Description

Isolation handcart and central metal-enclosed switchgear

technical field

The utility model relates to the field of electrical equipment, in particular to an isolated handcart and a central metal-enclosed switchgear.

Background technique

With the significant improvement of the design and manufacturing level of KYN28 armored central metal-enclosed switchgear (abbreviation: central cabinet), the central cabinet has been widely used in the field of power supply and distribution. However, in the power supply scheme using the central cabinet, there is often a configuration scheme of bus-connector cabinet + lifting cabinet. The design of the isolation handcart in the lifting cabinet has no special arc extinguishing device, and generally cannot be used to switch on or cut off the load current. If the circuit breaker QF in the bus tie cabinet (referred to as: bus tie circuit breaker QF) is in the closing state, the isolation handcart in the lifting cabinet (referred to as: isolation handcart) is pushed into or pushed out of the lifting cabinet (isolation handcart push Entering or pushing out the lifting cabinet is achieved by turning the handle outside the chassis of the isolated handcart, and a set of worm-based rotating mechanisms in the rotating chassis, that is, pushing the isolated handcart into or pushing out the lifting cabinet through the rotation of the worm) is equal to Closing or opening of the isolated handcart with load will cause a three-phase arc short-circuit accident, and may also endanger the personal safety of the operator due to the severe arc generated by misoperation. In severe cases, the isolated handcart cabinet may even explode, causing damage to equipment, more personal harm.

Utility model content

The utility model proposes an isolation handcart, which solves the safety problem caused by the inability to lock the rotation mechanism of the isolation trolley in the prior art, so that the isolation trolley is pushed in or pushed out by mistake.

An isolated handcart of the utility model comprises: a frame, a rotating mechanism installed in the frame and a handle outside the frame, the handle drives the rotating mechanism to rotate, and also includes: The baffle plate and the locking electromagnet, the baffle plate is movably installed on the vehicle frame, and is located between the rotating mechanism and the locking electromagnet, one end of the baffle plate bears against the rotating mechanism, and the other One end cooperates with the locking electromagnet to lock or release the rotating mechanism.

Wherein, the locking electromagnet includes an iron core and a lock tongue, the iron core is electrically connected to the bus circuit breaker, the lock tongue is magnetically connected to the iron core, and the other end of the baffle cooperates with the lock tongue to lock Hold or release the swivel mechanism.

The utility model also provides a middle-mounted metal-enclosed switchgear, including: a bus connection cabinet and a lifting cabinet, and also includes: the above-mentioned isolation handcart, and the lifting cabinet includes a DC control power supply and a two-pole DC circuit breaker. The positive pole of the DC control power supply, the positive pole of the DC circuit breaker, the auxiliary contact of the bus tie circuit breaker in the bus tie cabinet, the locking electromagnet of the isolated handcart, the negative pole of the DC circuit breaker and the negative pole of the DC control power supply are connected in series in sequence into an electrical locking circuit.

Wherein, the auxiliary contacts of the bus-tie circuit breaker in the bus-tie cabinet are introduced into the lifting cabinet through connecting wires.

The isolation handcart of the utility model is equipped with a locking electromagnet, which locks or releases the rotating mechanism through the locking electromagnet, thereby avoiding the safety hazard caused by the isolation handcart being accidentally pushed into or pushed out of the lifting cabinet when the bus tie circuit breaker is closed. question.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a kind of isolating handcart structure schematic diagram of the utility model embodiment;

Fig. 2 is the enlarged side view of the locking electromagnet locking the rotating mechanism in the dotted curve frame of Fig. 1;

Fig. 3 is the enlarged side view of the locking electromagnet in the dotted curve frame of Fig. 1 and unclamping the rotating mechanism;

Fig. 4 is a schematic diagram of the electrical connection between the locking electromagnet and the auxiliary contact of the bus tie circuit breaker.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. 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.

As shown in FIG. 1 , the isolated handcart of this embodiment includes: a vehicle frame 1 , a rotating mechanism 2 installed in the vehicle frame 1 and a handle 3 outside the vehicle frame 1 , and the handle 3 drives the rotating mechanism 2 to rotate. The rotating mechanism 2 is a set of rotating mechanisms based on worms, and is usually installed on the chassis of the frame 1 of the isolation handcart. It also includes: a baffle plate 4 and a locking electromagnet 5 installed on the vehicle frame 1, the baffle plate 4 is movably installed on the vehicle frame 1, and is located between the rotating mechanism 2 and the locking electromagnet 5 . One end of the baffle plate 4 bears against the rotating mechanism 2 , and the other end cooperates with the locking electromagnet 5 to lock or release the rotating mechanism 2 .

The isolation handcart of this embodiment is equipped with a locking electromagnet 5, which locks or releases the rotating mechanism 2 through the locking electromagnet 5, thereby avoiding that the isolation handcart is accidentally pushed into or pushed out of the lifting cabinet when the bus tie circuit breaker is closed. lead to safety problems.

The locking electromagnet 5 includes an iron core 51 and a lock tongue 52 , the iron core 51 is electrically connected to the bus circuit breaker, and the lock tongue 52 is magnetically connected to the iron core 51 . The other end of the baffle plate 4 cooperates with the locking tongue 52 to lock or release the rotating mechanism 2 .

As shown in Figure 2, the locking electromagnet 5 is in the locked state. At this time, the locking electromagnet 5 is de-energized, and the iron core 51 cannot attract the dead bolt 52, and the dead bolt 52 stretches out, resisting the baffle plate 4, and the baffle plate 4 The other end blocks the rotating mechanism 2, so that the rotating mechanism cannot rotate, thereby locking the pushing or pushing of the isolation handcart. As shown in Figure 3, the locking electromagnet 5 is in the unlocked state. At this time, the locking electromagnet 5 is energized, and the iron core 51 attracts the locking tongue 52 to retract. Since the baffle plate 4 is movably installed on the vehicle frame 1, The baffle plate 1 can move left and right, and when the rotating mechanism 2 rotates, the baffle plate 4 is pushed away and rotates freely to push or release the isolation car.

The utility model also provides a middle-mounted metal-enclosed switchgear, including: a bus coupling cabinet and a lifting cabinet, and also includes: the above-mentioned isolation handcart. As shown in Figure 4, the lifting cabinet includes a DC control power supply ±KM and a two-pole DC circuit breaker ZK. Positive pole +KM of DC control power supply, positive pole of DC circuit breaker ZK, auxiliary contact QF of bus tie circuit breaker in bus tie cabinet, locking electromagnet 5 of isolated handcart, negative pole of DC circuit breaker ZK and negative pole of DC control power supply -KM, connected in series in turn to form an electrical locking circuit.

Since the auxiliary contact QF of the bus tie circuit breaker is located in the bus tie cabinet, in this embodiment, the auxiliary contact QF of the bus tie circuit breaker in the bus tie cabinet is introduced into the lifting cabinet through connecting wires to facilitate connection.

The interlock logic of the bus coupler cabinet and the lifting cabinet is shown in Table 1 below:

Table 1 Interlock logic table of bus coupler cabinet and lifting cabinet

Opening and closing state of circuit breaker in bus tie cabinet Lifting cabinet isolation handcart position status circuit breaker open Allow isolated handcarts to enter and exit circuit breaker closed Prohibit the entry and exit of isolated handcarts

That is, when the bus tie circuit breaker is in the opening state, the auxiliary contact QF of the bus tie circuit breaker is closed, and the locking electromagnet on the isolation handcart is electrically unlocked (the iron core in Figure 3 sucks up the lock tongue), shake the handle, and rotate When the mechanism rotates, the baffle is pushed open, and the isolation handcart is pushed in or out. Conversely, when the bus tie circuit breaker is in the closing state, the auxiliary contact QF of the bus tie circuit breaker is opened, the locking electromagnet on the isolation handcart is de-energized, and the iron core cannot be closed (the iron core cannot be closed by the lock tongue in Figure 2) , the lock tongue clamps the rotating mechanism on the chassis of the isolated handcart through the baffle, and the rotating mechanism in the isolated handcart cannot rotate at this time, so that the isolated handcart cannot be pushed in or out.

The design of adding a locking electromagnet to the isolating handcart of the lifting cabinet is to achieve the purpose of safe operation through the mutual interlocking of the isolating handcart and the bus tie circuit breaker. "Irregular operation" caused by normal operating force. In this case, the highly reliable interlock can fully prevent or stop the operator's possible "informal operation". It can ensure the correctness of the operating procedure itself, as well as the safe operation of the power grid, ensure equipment and personal safety, and prevent misoperation with load.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (3)

1. an isolation handcart, comprise: vehicle frame, be arranged on the rotating mechanism in described vehicle frame and the handle outside vehicle frame, described handle drives rotating mechanism rotates, it is characterized in that, also comprise: be arranged on the baffle plate on described vehicle frame and latching electromagnet, described baffle plate is arranged on described vehicle frame movably, and between described rotating mechanism and latching electromagnet, described rotating mechanism is withstood in one end of described baffle plate, the other end coordinates to pin with described latching electromagnet or unclamps described rotating mechanism, described latching electromagnet comprises iron core and dead bolt, described iron core electric connecting busbar circuit breaker, described dead bolt magnetic connects described iron core, the other end of described baffle plate coordinates to pin with described dead bolt or unclamps described rotating mechanism.

2. a middle metal enclosed switchgear, comprise: mother cabinet and lifting cabinet, it is characterized in that, also comprise: isolate handcart as claimed in claim 1, DC control supply, the two poles of the earth DC circuit breaker is comprised in described lifting cabinet, the negative pole of the auxiliary contact of the bus in the positive pole of described DC control supply, the positive pole of DC circuit breaker, mother cabinet, the described latching electromagnet of isolation handcart, the negative pole of DC circuit breaker and DC control supply, is connected into electric blocking loop successively.

3. middle metal enclosed switchgear as claimed in claim 2, is characterized in that, the auxiliary contact of the bus in described mother cabinet are introduced in described lifting cabinet by connecting wire.