CN-121984240-A - Automatic isolator of linkage formula neutral point

CN121984240ACN 121984240 ACN121984240 ACN 121984240ACN-121984240-A

Abstract

The invention discloses a linkage type neutral point automatic isolating switch which comprises a protecting module, a power supply module, a main control module and a signal acquisition module, wherein the protecting module comprises an installing part and a shell part, the installing part is installed at the top end and the inside of the shell part, the power supply module is driven by utilizing the secondary side voltage of a voltage transformer and is configured with a standby power supply unit based on a passive driving principle, an external power supply is not needed, the main control module is located in the protecting module, the signal acquisition module is located on the side wall of the main control module, the signal acquisition module realizes accurate control through double signal acquisition feedback, and realizes automatic switching between PT neutral point grounding and isolation through linkage of an electric control isolating switch and a bistable spring driving switch of an STM32 main control module and an executing module, so that the traditional manual disconnection and PT connection operation is replaced.

Inventors

WU CONGCONG
JIANG TAO
YANG JIANLI
LIN YIZE
LONG YUNFEI
SUN PENG
LAN TIANBAO
HU HAI
CHEN XIANG
JI YONGSHENG
LU YUCHU

Assignees

贵州电网有限责任公司

Dates

Publication Date: 20260505
Application Date: 20251225

Claims (10)

1. A linkage neutral point automatic isolating switch is characterized by comprising, A protection module (1) comprising a mounting member (11) and a housing member (12), the mounting member (11) being mounted on top of and inside the housing member (12); the power supply module (2) is driven by utilizing the secondary side voltage of the voltage transformer based on a passive driving principle, and is provided with a standby power supply unit without an external power supply; The main control module (3), the said main control module (3) locates at the inside of the protective module (1); The signal acquisition module (4), the signal acquisition module (4) is located on the side wall of the main control module (3), and the signal acquisition module (4) realizes accurate control through dual signal acquisition feedback; The execution module (5) can rapidly switch the state of the switch, and is matched with the time delay reset function of the main control module (3) to realize rapid isolation during faults and automatic reset after fault elimination; the device is installed in a serial mode, and the structure of the existing voltage transformer and feeder terminal unit is not required to be modified.
2. The linkage neutral point automatic disconnecting switch of claim 1, wherein the mounting piece (11) comprises a fixed disc (111) and a mounting back plate (112), the fixed disc (111) is made of Q235 steel plates, the surface of the fixed disc is galvanized, and the mounting back plate (112) is made of stainless steel and is detachably connected with the shell piece (12) through bolts.
3. The automatic isolating switch for the linkage neutral point according to claim 2, wherein the outer shell (12) comprises a stainless steel box body (121) and a toughened glass transparent observation window (122), and the toughened glass transparent observation window (122) is embedded in the front surface of the stainless steel box body (121).
4. The automatic isolating switch for the neutral point of the linkage type according to claim 3, wherein a handle (123) is arranged on the front surface of the stainless steel box body (121), and an isolating switch operation indicator lamp (124) is arranged at the top end of the toughened glass transparent observation window (122).
5. The automatic isolating switch of a linkage neutral point according to claim 4, wherein the power supply module (2) comprises a monocrystalline silicon solar panel (21) and a lithium battery pack (22), the monocrystalline silicon solar panel (21) is installed at the top of a stainless steel box body (121), the lithium battery pack (22) is installed at the inner bottom of the stainless steel box body (121), and the lithium battery pack (22) is electrically connected with the monocrystalline silicon solar panel (21) and the main control module (3) to form a standby power supply loop.
6. The automatic isolating switch of a linkage neutral point according to claim 5, wherein the main control module (3) comprises a main control module (31) and a delay relay module (32), the main control module (31) integrates signal processing, logic judgment and control output functions, and the delay relay module (32) has a rated voltage of 12V.
7. The automatic isolating switch of a linkage neutral point according to claim 6, wherein the signal acquisition module (4) comprises a Hall sensing module (41) and a waterproof aviation plug (42), the Hall sensing module (41) is used for acquiring a direct current signal of a direct current test feeder, the aviation plug (42) is connected to a voltage acquisition port of a feeder terminal unit to acquire a PT secondary side voltage signal, and the two signals are electrically connected with the main control module (31).
8. The linkage neutral point automatic isolating switch of claim 7, wherein the executing module (5) comprises a bistable spring driving switch (51), an electric control isolating switch (52) and a red copper wiring copper bar (53), the electric control isolating switch (52) is connected in series with a PT neutral point grounding loop, switching is achieved through switching on and switching off of a relay module (32), and the bistable spring driving switch (51) is used for resetting and closing.
9. The automatic isolating switch as in claim 8, wherein the isolating switch operation indicator light (124) is mounted on the front surface of the stainless steel box body (121), the red indication of the open state and the green indication of the closed state are electrically connected with the main control module (31), and the handle (123) is made of engineering plastic material and is arranged on the side wall of the front surface of the stainless steel box body (121).
10. The linkage neutral point automatic disconnecting switch of claim 9 wherein said executing module (5) comprises a protecting module (55) arranged on the inner wall of said stainless steel box (121); The protection module (55) comprises a fuse (551) and a relay (552) which are arranged in the stainless steel box body (121), the fuse (551) is connected in series with a power supply loop, and the relay (552) is used for PT secondary side voltage acquisition and control instruction execution.

Description

Automatic isolator of linkage formula neutral point Technical Field The invention relates to the field of isolating switches, in particular to a linkage type neutral point automatic isolating switch. Background In the daily operation and maintenance of distribution network lines, fault processing and preventive tests are key links for guaranteeing power supply reliability, and the grounding and isolation operation of neutral points of voltage transformers (PT) directly affect fault detection efficiency, equipment operation safety and power supply recovery speed. At present, the disconnection and multiplexing operation of the PT neutral point and the line is generally finished in the industry by adopting a traditional manual mode. After the fault occurs, operation and maintenance personnel need to be arranged to arrive at the site to manually disconnect PT and the line, and after the fault is detected, the operation and maintenance personnel need to manually return to the site to restore the ground, so that the whole flow has complex operation and delayed response. Statistics data show that under the traditional manual operation mode, single fault investigation takes 30 minutes on average, so that the power failure time of the distribution network is greatly prolonged, and the electricity consumption experience and the power supply reliability of a user are seriously affected. Meanwhile, the standardization of manual operation depends on personnel experience and skill level, the operation error rate is higher, the problems of PT secondary side open circuit, grounding failure and the like are easily caused, PT equipment is damaged, and equipment maintenance cost and operation and maintenance risks are increased. In the distribution network fault investigation process, a direct current signal is sent by means of a direct current test feeder to locate a fault point, but a PT neutral point is directly grounded to form a signal bypass, so that the signal of the direct current test feeder is attenuated or distorted, the fault position cannot be accurately judged, the rush repair progress is obviously hindered, and the power failure time is further prolonged. The traditional operation is not supported by a standardized automatic device, the operation quality and the response speed are completely dependent on the professional ability, responsibility center and arrival time of operation and maintenance personnel, potential problems of nonstandard operation, untimely response and the like exist, and the stability and consistency of the operation and maintenance of the distribution network are difficult to ensure. The existing part of improved operating devices can be installed in an adaptive mode only by greatly modifying the structures of original PT and Feeder Terminal Units (FTUs), so that construction difficulty and modification cost are increased, operation stability of original equipment can be possibly affected, and popularization of the improved operating devices in practical engineering application is limited. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to overcome the defects of low efficiency, large potential safety hazard, interference fault positioning and poor suitability of the traditional PT neutral point grounding and isolation manual operation. The technical problem is solved by the following technical scheme that the invention provides a linkage neutral point automatic isolating switch which comprises a protection module, wherein the protection module comprises a mounting piece and a shell piece, and the mounting piece is mounted at the top end and inside the shell piece; The power supply module is driven by utilizing the secondary side voltage of the voltage transformer based on a passive driving principle and is provided with a standby power supply unit without an external power supply; The main control module is positioned in the protection module; The signal acquisition module is positioned on the side wall of the main control module and realizes accurate control through dual signal acquisition feedback; the execution module can rapidly switch the state of the switch and is matched with the time delay reset function of the main control module to realize rapid isolation during faults and automatic reset after the faults are removed; the device is installed in a serial mode, and the structure of the existing voltage transformer and feeder terminal unit is not required to be modified. In an optimal mode of the linkage type neutral point automatic isolating switch, the mounting piece comprises a fixed disc and a mounting back plate, the fixed disc is made of Q235 steel plates and galvanized on the surface, and the mounting back plate is made of stainless steel and is detachably connected with the shell piece through bolts. In one preferable mode of the linkage neutral point automatic disconnecting switch, the shell piece comprises a stainless steel box b