CN212063247U - High-power PT handcart - Google Patents

Abstract

The utility model belongs to the technical field of electrical switching equipment and specifically relates to a high-power PT handcart, including automobile body, contact arm, arrester, fuse, voltage transformer and harmonic elimination ware, the automobile body upper end is equipped with three contact arm, three arrester and three fuse, and contact arm and arrester are all installed on the automobile body, and the arrester free end is connected with the contact arm bottom that corresponds and the fuse upper end that corresponds respectively, and on the automobile body was located to three voltage transformer finished product font, and each voltage transformer primary end links to each other with the fuse lower extreme that corresponds respectively, and each voltage transformer secondary end draws forth the secondary end copper bar respectively and crosses in a bit, and the automobile body lower part is located to the harmonic elimination ware, just the crossing point of secondary end copper bar with the harmonic elimination ware links to each other. The utility model discloses can satisfy the great consumer operation requirement of secondary load, and small, simple to operate to have and prevent overvoltage, prevent functions such as secondary resonance.

Description

High-power PT handcart

Technical Field

The utility model belongs to the technical field of the electrical switching equipment and specifically relates to a high-power PT handcart.

Background

The PT handcart is a draw-out handcart functional unit, is suitable for a middle-set type medium-voltage switch cabinet, and is usually matched with power equipment such as a vacuum circuit breaker and the like in a neutral point non-effective grounding system. The PT handcart is generally provided with devices such as a voltage transformer, but for electric equipment with large secondary load, the PT handcart generally needs to be matched with the voltage transformer with large capacity, but the large-capacity voltage transformer is often too large in size, so that the automobile body is used under the condition of overlarge influence, and for electric equipment with large secondary load, the PT handcart is required to be considered to prevent overvoltage, secondary harmonic and other problems so as to ensure the operation safety.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-power PT handcart, voltage transformer are article font and arrange, can satisfy the great consumer operation requirement of secondary load, and small, simple to operate to have and prevent overvoltage, prevent functions such as secondary resonance.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides a high-power PT handcart, includes the automobile body, touches arm, arrester, fuse, voltage transformer and harmonic elimination ware, the automobile body upper end is equipped with three arm, three arrester and three fuse of touching, touches arm and arrester and all installs on the automobile body, and the arrester free end is connected with the corresponding arm bottom of touching and the fuse upper end that corresponds respectively, and three voltage transformer finished product font is located on the automobile body, and each voltage transformer's primary end links to each other with the fuse lower extreme that corresponds respectively, and each voltage transformer's secondary end draws the secondary end copper bar respectively and crosses in a bit, and the automobile body lower part is located to the harmonic elimination ware, just the intersection point of secondary end copper bar with the harmonic elimination ware links to each other.

The contact arm is installed on the vehicle body through a post insulator, and a contact which is meshed with a fixed contact in the switch cabinet is arranged at the free end of the contact arm.

The lightning arrester free end is connected with the corresponding contact arm through a connecting copper bar, and the lightning arrester free end is provided with a fuse clip connected with the upper end of the corresponding fuse.

The primary ends of the voltage transformers positioned on the upper side are connected with the corresponding lower ends of the fuses through the middle copper bars, and the primary ends of the two voltage transformers positioned on the lower side are connected with the corresponding lower ends of the fuses through the side copper bars respectively.

The side copper bar is supported and installed on the vehicle body through the insulator, and an insulating cover is arranged on the fuse connected with the side copper bar.

The automobile body includes chassis and insulating curb plate, touch arm, arrester, fuse, voltage transformer and harmonic elimination ware and all locate in the space that chassis and both sides insulating curb plate enclose to be synthetic.

And travelling wheels are arranged on two sides of the chassis.

The utility model discloses an advantage does with positive effect:

1. the utility model discloses a three voltage transformer is article font and arranges, can satisfy the great consumer operation requirement of secondary load, and the volume ratio is less and simple to operate.

2. The utility model discloses fuse and arrester are connected to each phase voltage mutual-inductor primary end, and the harmonic elimination ware is connected to the secondary end, not only can the switching voltage, provides the electric energy for secondary control, measurement return circuit, still has the overvoltage of preventing, prevents functions such as secondary resonance, guarantees operation safety.

Drawings

Figure 1 is a front view of the present invention,

figure 2 is a left side view of the present invention of figure 1,

figure 3 is an enlarged view at a in figure 2,

fig. 4 is a schematic view of the body frame of fig. 1.

Wherein, 1 is the automobile body, 101 is the chassis, 102 is insulating curb plate, 2 is for touching the arm, 201 is post insulator, 3 is the harmonic elimination ware, 4 is voltage transformer, 5 is the side copper bar, 6 is the insulator, 7 is the insulating boot, 8 is the arrester, 9 is the fuse, 10 is the secondary end copper bar, 11 is the connection copper bar, 12 is middle copper bar.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

As shown in figures 1-4, the utility model comprises a car body 1, a contact arm 2, a lightning arrester 8, a fuse 9, a voltage transformer 4 and a resonance eliminator 3, wherein the upper end of the car body 1 is provided with three contact arms 2, three lightning arresters 8 and three fuses 9, wherein the contact arms 2 are respectively installed on the car body 1 through post insulators 201, the lightning arrester 8 is directly installed on the car body 1, the free end is connected with the bottom end of the corresponding contact arm 2 through a connecting copper bar 11, the free end of the lightning arrester 8 is also provided with a fuse clip connected with the upper end of the corresponding fuse 9, the fuse clip is a commercially available product in the prior art, the three voltage transformers 4 are arranged on the car body 1 in a shape like Chinese character, wherein the primary end of the voltage transformer 4 positioned at the upper side is connected with the lower end of the corresponding fuse 9 through a middle copper bar 12, the primary ends of the two voltage transformers 4 positioned at the lower side are respectively connected, the secondary ends of the voltage transformers 4 are respectively led out of a secondary end copper bar 10 and are intersected at one point, the resonance eliminator 3 is arranged on the lower portion of the vehicle body 1, the intersection point of the secondary end copper bar 10 is connected with the resonance eliminator 3, and the resonance eliminator 3 is connected with the output end.

As shown in fig. 2 to 3, a contact is disposed at a free end of the contact arm 2 for engaging with a fixed contact in a switch cabinet, and the contact is a tulip contact in this embodiment, which is a known technology in the art.

As shown in fig. 1-2, the side copper bars 5 are supported and installed on the vehicle body 1 through a plurality of insulators 6, and in addition, the fuses 9 connected with the side copper bars 5 are respectively provided with an insulating cover 7. The post insulator 201 and the insulator 6 are well known in the art and are commercially available.

As shown in fig. 4, the vehicle body 1 includes a chassis 101 and insulating side plates 102, the contact arm 2, the lightning arrester 8, the fuse 9, the voltage transformer 4 and the resonance eliminator 3 are all disposed in a space enclosed by the chassis 101 and the insulating side plates 102 on two sides, and traveling wheels are disposed on two sides of the chassis 101. The lightning arrester 8, the fuse 9, the voltage transformer 4 and the resonance eliminator 3 are all known in the art.

The utility model discloses a theory of operation does:

the utility model discloses to touch arm 2, arrester 8, fuse 9, voltage transformer 4 and harmonic elimination ware 3 are integrated on an automobile body 1, when communication cable or equipment move under normal operating voltage, touch arm 2 contact and the interior static contact interlock of cubical switchboard, static contact conduction in the terminal box is once through in the cabinet to touch arm 2 contact to primary current, and through touching arm 2, arrester 8 and fuse 9 carry to voltage transformer 4's primary end, voltage transformer 4 converts the high tension electricity to and exports sampling signal and for synthesizing the guarantor power supply through the secondary after the low tension electricity.

The utility model provides a three voltage transformer 4 is article font setting under the circumstances of guaranteeing safe air distance, is applicable to the cubical switchboard that uses the air as insulating medium simply, satisfies alternate and relative ground's minimum air gap, can realize high-power output, satisfies the great consumer operation requirement of secondary load to it is small, the installation is nimble.

Additionally the utility model discloses normal during operation, arrester 8 can not produce the effect, regards as open circuit to ground, in case high voltage appears and when endangering being insulated by protection equipment, arrester 8 acts with high voltage impulse current direction earth immediately to the limiting voltage amplitude protects communication cable and equipment insulation. When the overvoltage disappears, the lightning arrester 8 is rapidly restored to the original state, so that the communication line works normally. When a short circuit occurs, a large current is generated in the circuit instantly, a fuse wire of a fuse 9 is rapidly fused before equipment is not damaged, so that the purpose of cutting off the circuit is achieved, the resonance eliminator 3 is essentially a high-capacity nonlinear resistor, plays roles in damping and current limiting, and can achieve a good effect of limiting ferromagnetic resonance of a voltage transformer, if a neutral point of a 6-35 kV power grid is not grounded, a TV primary winding connected with Y0 on a bus becomes a unique metallic channel of the power grid to the ground, the power grid ground capacitance has a charging and discharging transition process through the TV primary winding, tests show that a power frequency half-wave inrush current with the highest amplitude often reaching several amperes passes through a TV, the current can fuse a high-voltage TV fuse, and after the resonance eliminator 3 is installed, the inrush current is effectively inhibited, and the high-voltage fuse is not fused due to the inrush current.

The utility model discloses the permission stops in operation, experiment, maintenance position, must not stop in other positions. Push away to experimental position after the maintenance, carry out the transmission test, but experimental good rear drop-in operation works as the utility model discloses when pushing in the cabinet, should keep pushing perpendicularly slowly.

Claims (7)

1. The utility model provides a high-power PT handcart which characterized in that: comprises a vehicle body (1), a contact arm (2), a lightning arrester (8), a fuse (9), a voltage transformer (4) and a resonance eliminator (3), the upper end of the vehicle body (1) is provided with three contact arms (2), three arresters (8) and three fuses (9), the contact arms (2) and the arresters (8) are both arranged on the vehicle body (1), the free end of the lightning arrester (8) is respectively connected with the bottom end of the corresponding contact arm (2) and the upper end of the corresponding fuse (9), the three voltage transformers (4) are arranged on the vehicle body (1) in a shape like a Chinese character 'ji', and the primary end of each voltage transformer (4) is respectively connected with the lower end of the corresponding fuse (9), the secondary end of each voltage transformer (4) is respectively led out of a secondary end copper bar (10) and is converged at one point, the resonance eliminator (3) is arranged at the lower part of the vehicle body (1), and the intersection point of the secondary end copper bar (10) is connected with the resonance eliminator (3).

2. The high power PT hand truck of claim 1, wherein: the contact arm (2) is installed on the vehicle body (1) through a post insulator (201), and a contact which is occluded with a static contact in the switch cabinet is arranged at the free end of the contact arm (2).

3. The high power PT hand truck of claim 1, wherein: the lightning arrester (8) free end is connected with the corresponding contact arm (2) through a connecting copper bar (11), and the lightning arrester (8) free end is provided with a fuse clip to be connected with the corresponding fuse (9) upper end.

4. The high power PT hand truck of claim 1, wherein: the primary ends of the voltage transformers (4) positioned on the upper side are connected with the lower ends of the corresponding fuses (9) through the middle copper bar (12), and the primary ends of the two voltage transformers (4) positioned on the lower side are connected with the lower ends of the corresponding fuses (9) through the side copper bars (5) respectively.

5. The high-power PT handcart of claim 4, characterized in that: the side copper bar (5) is supported and installed on the vehicle body (1) through the insulator (6), and an insulating cover (7) is arranged on the fuse (9) connected with the side copper bar (5).

6. The high power PT hand truck of claim 1, wherein: the vehicle body (1) comprises a chassis (101) and insulating side plates (102), and the contact arm (2), the lightning arrester (8), the fuse (9), the voltage transformer (4) and the resonance eliminator (3) are all arranged in a space enclosed by the chassis (101) and the insulating side plates (102) on the two sides.

7. The high power PT handcart of claim 6, characterized in that: and travelling wheels are arranged on two sides of the chassis (101).

Images