CN213717355U - 35kV high-voltage spacing structure for combined box transformer substation - Google Patents

Abstract

The utility model discloses a 35kV high pressure interval structure for making up formula case becomes in, a serial communication port, including whole combination box, two parts around the combination box divide into, the top of back box be equipped with and tie in side outgoing line terminal 1, the bottom of back box is equipped with transformer incoming line cable chamber 2, the upper portion left side of preceding box be equipped with arrester discharge recorder installation room 3, the upper portion right side of preceding box is equipped with instrument room 4, the lower part left side of preceding box is equipped with auxiliary switch installation room 6, the lower part right side of preceding box is equipped with secondary terminal row room 5. The utility model relates to a brand-new structure, satisfying under the electrical design requirement prerequisite, with vacuum circuit breaker, isolator, current transformer, earthing switch, test electric sensor, arrester mounted position optimal design among the high-voltage system, realize advancing, being qualified for the next round of competitions at a box, and have independent functional unit.

Description

35kV high-voltage spacing structure for combined box transformer substation

Technical Field

The utility model relates to a 35kV high pressure interval structure for among wind-powered electricity generation field engineering combination formula case becomes belongs to electrical equipment technical field.

Background

The national wind power investment is increased, the single machine capacity reaches 2.5MW and 3.2MW, the 35kV high-voltage interval of the combined box transformer of the wind power plant engineering is formed by combining a vacuum circuit breaker, a disconnecting switch, a grounding switch, a current transformer, a lightning arrester and a lightning arrester discharge recorder, the rated current of the circuit breaker is 630A, and the cut-off current is 31.5 kA.

The main scheme for configuring the 35kV high-voltage interval of the conventional wind power plant engineering combined box transformer substation is as follows: a 35kV load switch, wherein a main switch adopts an NFZR7-40.5D/63-31.5 combined electrical apparatus; a removable 35kV switch cabinet, such as a KYN61-40.5 circuit breaker scheme; a fixed 35kV switch cabinet, such as an XGN17-40.5 circuit breaker scheme, is shown in a primary system diagram, namely a diagram I, a diagram II and a diagram III.

As shown in fig. 1, the scheme of the load switch:

the advantages are that: the main switch adopts a 35kV combined electrical apparatus, the appearance size is small, the frame is formed by connecting angle steels, and the equipment cost is low;

the disadvantages are as follows: the device is suitable for a single machine with the capacity of below 1.6MW, the fuse is used for cutting off the fault current, the operation and the maintenance are complex, the requirement of distribution network automation is not met, and the market is gradually withdrawn.

As shown in fig. 2, the withdrawable circuit breaker solution:

the advantages are that: by adopting the scheme of the circuit breaker, the requirement of one-time wiring can be met; is assembled by aluminum-coated zinc plates, and has beautiful appearance and compact structure.

The disadvantages are as follows: the safe distance between the high-voltage live conductors in the cabinet and the ground does not meet the requirement of more than or equal to 300mm, an auxiliary edge partition board is required to meet the insulation requirement, and the requirement of eighteen measures of national grid is not met; a large amount of composite insulating materials are adopted in the cabinet, and the contact box is easy to generate condensation phenomenon.

As shown in fig. 3, the fixed circuit breaker solution:

the advantages are that: by adopting the scheme of the circuit breaker, the requirement of one-time wiring can be met; with the welded structure, the frame can bear the impact of self-operation and external electric force on the frame.

The disadvantages are as follows: the size is large, and the size of a single unit is 1900 multiplied by 3200 multiplied by 3100, so that the size of the combined box transformer is influenced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the problem of 35kV high-voltage interval structure commonality in current wind-powered electricity generation field engineering combination formula case becomes.

In order to solve the technical problem, the technical scheme of the utility model a 35kV high-pressure interval structure for in combination formula case becomes is provided, a serial communication port, including whole combination box, combination box divide into front and back two parts, the top of back box be equipped with and be incorporated into the power networks side outgoing line terminal 1, the bottom of back box is equipped with transformer incoming line cable chamber 2, the upper portion left side of preceding box be equipped with arrester discharge recorder installation room 3, the upper portion right side of preceding box is equipped with instrument room 4, the lower part left side of preceding box is equipped with auxiliary switch installation room 6, the lower part right side of preceding box is equipped with secondary terminal row room 5.

Preferably, the frame of the whole combined box body is high in front and low in back.

Preferably, a cable terminal in the transformer inlet cable chamber is connected with the boosting transformer, the boosting transformer connects the grounding switch, the current transformer, the vacuum circuit breaker and the isolating switch into a complete loop through a copper bus, the copper bus penetrates through an isolating switch sleeve to be connected with a cable on the side of a power grid, and meanwhile, a lightning arrester is connected in parallel on the side of the power grid.

The utility model relates to a brand-new structure, satisfying under the electrical design requirement prerequisite, with vacuum circuit breaker, isolator, current transformer, earthing switch, test electric sensor, arrester mounted position optimal design among the high-voltage system, realize advancing, being qualified for the next round of competitions at a box, and have independent functional unit. The structure is divided into a lightning arrester discharge recorder installation chamber, an auxiliary switch installation chamber, an instrument chamber and a secondary terminal row chamber when seen from the front of the cabinet, and is divided into a grid-connected side outgoing line terminal, a transformer incoming line cable chamber and a high-front and low-back framework when seen from the front side.

Drawings

Fig. 1 is a schematic structural view of a conventional load switch;

fig. 2 is a structural view of a conventional withdrawable circuit breaker;

fig. 3 is a block diagram of a conventional fixed circuit breaker;

fig. 4 is a front view of the present invention;

fig. 5 is a side view of the present invention;

fig. 6 is a circuit diagram of the present invention.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

As shown in fig. 4, 5 and 6, a 35kV high voltage spacing structure for use in a combined box transformer is characterized by comprising a whole combined box body, wherein the combined box body is divided into a front part and a rear part, a frame of the whole combined box body is high in the front and low in the rear, a grid-connected side outgoing line terminal 1 is arranged at the top of the rear box body, a transformer incoming line cable chamber 2 is arranged at the bottom of the rear box body, a lightning arrester discharge recorder installation chamber 3 is arranged at the left side of the upper part of the front box body, an instrument chamber 4 is arranged at the right side of the upper part of the front box body, an auxiliary switch installation chamber 6 is arranged at the left side of the lower part of the front box body, a secondary terminal row chamber 5 is arranged at the right side of the lower part of the front box; from bottom to top, the grounding switch, the current transformer, the vacuum circuit breaker and the isolating switch are connected into a complete loop by a copper bus; in the bus chamber, the copper bus passes through the isolating switch sleeve and is connected with the cable on the power grid side, and the lightning arrester is connected in parallel on the power grid side.

Breaker room and transformer inlet wire cable chamber 2 are equipped with prevent that mistake mechanical program lock 205JS is one set, the operation of opening the door: the door of the breaker room is opened first, the direct-pulling lock on the door of the breaker room is locked, then the key is taken out, and the network door lock of the incoming cable room 2 is opened by the key. Door closing operation: the transformer incoming cable chamber 2 is closed firstly, the internet access door lock of the transformer incoming cable chamber 2 door is locked, the key is taken out, the direct-pull lock on the door of the circuit breaker chamber is opened, and then the circuit breaker door is closed.

Claims (3)

1. The utility model provides a 35kV high voltage interval structure for making up formula case becomes in, its characterized in that, including whole combination box, two parts around the combination box divide into, the top of back box be equipped with and become incorporated into the power networks side outgoing line terminal (1), the bottom of back box is equipped with transformer incoming line cable room (2), the upper portion left side of preceding box be equipped with arrester discharge recorder installation room (3), the upper portion right side of preceding box is equipped with instrument room (4), the lower part left side of preceding box is equipped with auxiliary switch installation room (6), the lower part right side of preceding box is equipped with secondary terminal row room (5).

2. The 35kV high-voltage spacing structure for the combined box transformer substation as claimed in claim 1, wherein the frame of the whole combined box body is high in front and low in back.

3. The 35kV high-voltage spacing structure for the combined box transformer as claimed in claim 1, wherein a cable terminal in the transformer incoming cable chamber (2) is connected with a step-up transformer, the step-up transformer connects a grounding switch, a current transformer, a vacuum circuit breaker and a disconnecting switch into a complete loop through a copper bus, the copper bus passes through a bushing of the disconnecting switch and is connected with a cable on the side of a power grid, and a lightning arrester is connected in parallel on the side of the power grid.

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