CN210016170U - A kind of upper and lower isolation switch protection cabinet - Google Patents

Abstract

The utility model proposes an upper and lower isolating switch protection cabinet, which includes a cabinet assembly, a circuit breaker handcart, a primary static contact, a contact box, an upper isolating switch, an assembly of a main busbar and a branch busbar, a busbar bushing, a handcart type Multifunctional protection device, continuity bus, lower isolating switch, transformer, fixed grounding bus assembly, sensor, insulating plate and aviation socket. Quickly absorb overvoltage and protect the safety of other equipment. The handcart-type multi-function protection device effectively protects the circuit breaker in the parallel cabinet of the circuit breaker handcart to ensure the effective breaking effect of the large capacity of the circuit breaker handcart. Set the upper isolation switch and the lower isolation switch before and after the circuit breaker, establish a reliable insulation gap, and separate the equipment or lines that need to be repaired from the power supply with an obvious disconnection point to ensure the safety of maintenance personnel and equipment. The setting of insulating plates and aviation sockets plays a role in establishing reliable insulation. The structure is simple, the operation is convenient, and the utility model has practical application value.

Description

A kind of upper and lower isolation switch protection cabinet

technical field

The utility model belongs to the technical fields of photovoltaic power generation, state grid power distribution and industrial power consumption, in particular to an upper and lower isolation switch protection cabinet.

Background technique

The quick breaking capability of the fault short-circuit current is one of the most important performances of the circuit breaker. After the contacts of the circuit breaker are separated, an arc is generated between the contacts. When the arc current crosses zero, a transient recovery voltage will appear at both ends of the contacts. The rise rate and amplitude of the recovery voltage are the most important factors that affect whether the circuit breaker can be interrupted, because the success of the arc extinguishing of the circuit breaker mainly depends on the rise rate and amplitude of the transient recovery voltage. With the continuous expansion of the transmission capacity of the power system, the short-circuit current level of the power grid continues to increase. When the maximum short-circuit current exceeds the rated short-circuit breaking current of the circuit breaker, the circuit breaker will fail to break the short-circuit fault due to the failure of arc extinguishing. Under normal circumstances, the three-phase short circuit is the most serious, and the short-circuit current may reach tens of thousands or even hundreds of thousands of amperes. The heat and force generated by such a large current will cause damage to electrical equipment, such as the burning of the stator winding of the generator and the explosion of the transformer. and many more.

Utility model content

The purpose of the utility model is to provide an upper and lower isolation switch protection cabinet, which damps and suppresses the rise rate and amplitude of the transient recovery voltage of the vacuum circuit breaker, and realizes the functions of commutation, energy dissipation, magnetic and arc extinguishing.

To achieve the above object, the utility model provides the following technical solutions:

An upper and lower isolating switch protection cabinet, comprising a cabinet assembly, a circuit breaker handcart, a primary static contact, a contact box, an upper isolating switch, an assembly of a main busbar and a branch busbar, a busbar bushing, a handcart-type multifunctional protection device, Conductive busbar, lower isolating switch, transformer, fixed grounding busbar assembly, sensor, insulating plate and aviation socket; the cabinet assembly is the main part of the structure, the circuit breaker handcart, primary static contact, contact box, The upper isolating switch, main busbar and branch busbar assembly, busbar bushing, handcart-type multifunctional protection device, conducting busbar, lower isolating switch, transformer, fixed grounding busbar assembly, sensor and insulating plate are installed in the cabinet assembly Inside, the main busbar and the branch busbar are assembled and connected to the upper isolation switch, the upper isolation switch is connected to the primary static contact, and then connected to the circuit breaker handcart, conduction bus, lower isolation switch, transformer, The assembly of the fixed ground bus and the connection of the sensors form a complete current and voltage path. The handcart-type multifunctional protection device is connected in parallel with the circuit breaker handcart. The contact box is installed on the primary static contact and the circuit breaker. The connection place of the handcart, the busbar sleeve is installed at the assembly of the main busbar and the branch busbar, the insulating plate is arranged between the handcart-type multi-function protection device and other devices, and the handcart-type multi-function protection device is installed. The functional protection device is enclosed, and the insulating plate is connected to the aviation socket.

According to one aspect of the present invention, the circuit breaker handcart and the handcart-type multifunctional protection device can be moved electrically, respectively, so as to be connected or separated from the primary static contact.

According to one aspect of the present invention, the upper isolating switch and the lower isolating switch can be closed or opened to connect or disconnect the circuit.

According to one aspect of the present invention, the assembly of the main busbar and the branch busbar is longitudinally arranged from top to bottom.

According to an aspect of the present invention, a sensor is also installed on the line between the upper isolating switch and the primary static contact.

Owing to adopting the above-mentioned scheme, the beneficial effects of the present utility model are:

The utility model is an upper and lower isolation switch protection cabinet designed for the actual needs of photovoltaic power generation, state grid power distribution, and industrial electricity industries, and has a simple structure and convenient operation. Quickly absorb overvoltage and protect the safety of other equipment. Both the handcart-type multifunctional protection device and the circuit breaker handcart can be pushed out. To ensure the effect of large-capacity and effective breaking of the circuit breaker handcart. Since the busbar supplies power from above through the cabinet, a set of upper isolating switches is set in front of the circuit breaker to isolate the power supply, and a set of lower isolating switches is set behind the circuit breaker to isolate the load from the load to establish a reliable insulation gap, which will require maintenance. The equipment or line and the power supply are separated by obvious disconnection points to ensure the safety of maintenance personnel and equipment. The setting of the insulating plate and the aviation socket plays a role in establishing reliable insulation for the handcart-type multi-function protection device to ensure the safety of maintenance personnel and equipment. It provides effective support for commutation, energy dissipation, magnetization, and arc extinguishing in photovoltaic power generation, state grid power distribution, and industrial power industries, and has practical application value.

Description of drawings

Figure 1 is a front view of the present invention.

Figure 2 is a side view of the present invention.

Fig. 3 is the protection scheme diagram of the present utility model.

Description of reference numerals: cabinet assembly 1, circuit breaker handcart 2, primary static contact 3, contact box 4, upper isolating switch 5, main busbar and branch busbar assembly 6, busbar bushing 7, handcart-type multi-function Protection device 8 , conduction bus 9 , lower isolating switch 10 , transformer 11 , fixed ground bus assembly 12 , sensor 13 , insulating plate 14 , aviation socket 15 .

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in Figures 1 and 2, the upper and lower isolation switch protection cabinet of the present invention is composed of cabinet assembly 1, circuit breaker handcart 2, primary static contact 3, contact box 4, upper isolation switch 5, main busbar Assembly with branch busbar 6, busbar bushing 7, handcart-type multifunctional protection device 8, conducting busbar 9, lower isolating switch 10, transformer 11, fixed grounding busbar assembly 12, sensor 13, insulating plate 14, aviation socket 15 composition.

Referring to Figure 1 and Figure 2, the action of the present utility model is related as follows: the cabinet assembly 1 is the main part of the cabinet, and the interior of the cabinet assembly 1 is mainly connected by the main busbar and the branch busbar assembly 6. The disconnector 5 is then connected to a static The contact 3 and the circuit breaker trolley 2 are then connected with the conduction bus 9, the lower isolating switch 10, the transformer 11, the fixed grounding bus assembly 12, and the sensor 13 to form a complete current and voltage path, and the trolley-type multi-functional The protection device 8 is connected in parallel with the circuit breaker trolley 2. Both the trolley-type multifunctional protection device 8 and the circuit breaker trolley 2 can be pushed out. The contact box 4 is used to protect the primary static contact 3 and the circuit breaker trolley 2. It is set according to the insulation level requirements of the connection. The busbar bushing 7 is set to protect the insulation level requirements of the main busbar and the branch busbar assembly 6. The insulating plate 14 is set between the handcart-type multifunctional protection device 8 and other devices. Type multifunctional protection device 8 is enclosed, and the insulating plate 14 is connected to the aviation socket 15. FIG. 3 is a protection scheme diagram of the present invention, showing the structure of the present invention.

Referring to Figures 1 and 2, the protection principle of the present invention is as follows: the cabinet is arranged side by side with other busbar cabinets, so when various overvoltage rises occur on the entire busbar, 6 pairs of primary static contacts are assembled through the main busbar and the branch busbar The head 3 and the circuit breaker handcart 2 form a complete current and voltage path with the conduction busbar 9, the transformer 11, the fixed grounding busbar assembly 12, and the sensor 13, which are directly absorbed by the handcart-type multifunctional protection device 8 and pass through. The conducting bus 9 , the transformer 11 , and the fixed ground bus assembly 12 enter the ground, which reflects the function of the present invention to quickly absorb overvoltage and protect the safety of other equipment. At the same time, the handcart-type multifunctional protection device 8 effectively protects the circuit breakers in the parallel cabinets of the circuit breaker handcart 2, ensuring the effect of the large capacity of the circuit breaker handcart 2 to effectively break. Since the main busbar and the branch busbar assembly 6 are powered downward through the cabinet from above, a set of upper isolating switches 5 are set in front of the circuit breaker to isolate the power supply, and a set of lower isolating switches 10 are set behind the circuit breaker to isolate the load from the load. A reliable insulation gap separates the equipment or lines that need to be repaired and the power supply with an obvious disconnection point to ensure the safety of maintenance personnel and equipment. The arrangement of the insulating plate 14 and the aviation socket 15 plays a role in establishing reliable insulation for the handcart-type multifunctional protection device 8 to ensure the safety of maintenance personnel and equipment.

The above description of the embodiments is for the convenience of those skilled in the art to understand and apply the present patent. It will be apparent to those skilled in the art that various modifications to these embodiments can be readily made, and the generic principles described herein can be applied to other embodiments without inventive step. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention without departing from the scope of the present invention should all fall within the protection scope of the present invention.

Claims (5)

1. The utility model provides an upper and lower isolator protection cabinet which characterized in that: the device comprises a cabinet body assembly, a circuit breaker handcart, a primary static contact, a contact box, an upper isolating switch, a main bus and branch bus assembly, a bus sleeve, a handcart type multifunctional protection device, a conducting bus, a lower isolating switch, a mutual inductor, a fixed grounding bus assembly, a sensor, an insulating plate and an aviation socket; the cabinet body assembly is a main body part framework, the breaker handcart, a primary static contact, a contact box, an upper isolating switch, a main bus and a branch bus assembly, a bus sleeve, a handcart type multifunctional protection device, a conduction bus, a lower isolating switch, a mutual inductor, a fixed grounding bus assembly, a sensor and an insulation board are installed inside the cabinet body assembly, the main bus and the branch bus assembly are connected with the upper isolating switch, the upper isolating switch is connected with the primary static contact and then connected with the breaker handcart, the conduction bus, the lower isolating switch, the mutual inductor, the fixed grounding bus assembly and the sensor to form a complete current-voltage circuit, the handcart type multifunctional protection device is connected with the breaker handcart in parallel, the contact box is installed at the connection part of the primary static contact and the breaker handcart, the bus sleeve is installed at the main bus and branch bus assembly part, the insulating board sets up between handcart-type multi-functional protection device and other devices, will handcart-type multi-functional protection device encloses, and the insulating board is connected the aviation socket.

2. The upper and lower isolating switch protection cabinet according to claim 1, characterized in that: the circuit breaker handcart and the handcart type multifunctional protection device can be electrically moved respectively, so that the circuit breaker handcart and the handcart type multifunctional protection device can be connected with or separated from the primary static contact.

3. The upper and lower isolating switch protection cabinet according to claim 1, characterized in that: the upper isolating switch and the lower isolating switch can be closed or opened, so that the circuit is switched on or off.

4. The upper and lower isolating switch protection cabinet according to claim 1, characterized in that: the main bus bar and the branch bus bar are assembled and longitudinally arranged from top to bottom.

5. The upper and lower isolating switch protection cabinet according to claim 1, characterized in that: and a sensor is also arranged on a circuit between the upper isolating switch and the primary static contact.

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