CN219535416U - Switch cabinet with improved electromagnetic locking state monitoring of isolation handcart - Google Patents

Abstract

The isolation handcart is also provided with a blocking loop monitoring module, a blocking fault alarming module and a fault alarming output module; the locking loop monitoring module is formed by connecting a bus-tie circuit breaking auxiliary point of a bus-tie circuit breaker, an electromagnetic locking monitoring contact of a locking electromagnet with a power terminal in a time relay in series; the locking fault alarm module consists of a switch state display and a fault alarm terminal in the time relay which are connected in series; the fault alarm output module includes an alarm output terminal in the time relay. By utilizing and developing auxiliary contacts of the bus-tie breaker and the latching electromagnet to configure a time relay and a switch state display instrument, the operation state of the latching electromagnet is monitored simply and effectively, and whether the latching electromagnet is burnt out due to faults or not is monitored.

Description

Switch cabinet with improved electromagnetic locking state monitoring of isolation handcart

Technical Field

The utility model belongs to the technical field of handcart circuit breaker monitoring control in a handcart control cabinet, and particularly relates to an innovative and improved technology for handcart switch cabinet locking auxiliary isolation handcart electromagnetic locking state monitoring.

Background

Isolation trolleys are arranged in the handcart switch cabinet electrical equipment or the handcart control cabinet. It has three positions in the switchgear: operation/test/disconnection.

The isolating handcart, i.e. handcart circuit breaker, is an extremely promising electrical switching device in the low-voltage and medium-voltage fields, and the isolating handcart is a main component in a withdrawable switch cabinet, and the main components on the handcart generally comprise primary electrical equipment such as a circuit breaker, a transformer and the like. The breaker body and the frame are fixed on the chassis trolley to form the breaker handcart. Because the handcart cabinet has good interchangeability, the reliability of the equipment system can be greatly improved. The specific working principle is as follows: after the circuit breaker handcart is pushed to a working position, an operating mechanism drives a switch-on through an insulating pull rod and other devices, current is introduced through an upper plum blossom contact, and flows through an upper wire outlet seat, an upper contact arm and a movable and static contact of an indoor cavity, and is fed out to a circuit or equipment through a lower contact arm and a lower plum blossom contact.

The isolating handcart is an isolating switch with a drawable part arranged in the middle of the switch cabinet, a conductive rod or a copper bar is arranged between the upper contact and the lower contact, and a visible port of the isolating handcart and a main loop is realized through the plum blossom contact, so that the isolating effect is achieved. The isolation handcart has the advantages that the working principle and the function of the isolation handcart are similar to those of an isolation switch, the incoming line is provided with an obvious disconnection point when overhauling, misoperation prevention is achieved, the isolation handcart is provided with electric and mechanical locking, the locking electromagnet is electrified when the main loop is electrified, and the handcart cannot shake out, so that misoperation prevention is achieved. Under the condition that the switch is disconnected, the guide rail can be pulled out of the switch cabinet by hand after being paved, so that maintenance or replacement can be performed.

In the use process, according to regulations, all high-voltage electric equipment which is possibly caused to be misoperation should be provided with an error prevention device and a corresponding error prevention electric locking loop. For a cabinet-type switch cabinet in an isolating switch handcart, the requirement of five prevention means that:

(1) preventing the pulling and pushing of the handcart by load.

(2) Preventing the switch from being closed by mistake with the ground knife.

(3) Preventing the electrified ground engaging knife from being mistakenly engaged.

(4) Preventing false entry into the charging interval.

(5) Preventing the load from being pulled by mistake and the isolation handcart from being closed by mistake.

In the prior art, a handcart room and an isolation handcart are arranged in a cabinet body, and as shown in figure 1, a small bus power module and a locking power protection module are arranged in a switch cabinet; the isolation handcart is provided with a handcart locking loop module. The small bus power supply module comprises a small bus power supply positive terminal and a small bus power supply negative terminal; the locking power supply protection module comprises a miniature circuit breaker; the handcart locking loop module is connected with a bus circuit breaker and a locking electromagnet in series.

However, when the bus-tie breaker is not put into operation and is in a test position for opening, the locking electromagnet QS on the isolation handcart is electrified for a long time, and even the blocking electromagnet QS can be burnt out due to the long-time electrification, and the isolation handcart or the isolation switch cannot be operated with load due to the five-prevention requirement of the switch cabinet, so that the chassis of the isolation handcart cannot be accurately retracted to the test position from the working position, and the equipment maintenance is affected.

The improvement technical scheme of the monitoring and optimizing of the isolation handcart is less in disclosure and cannot be used for solving the problems. As disclosed in chinese patent application 201910671838.6, an intelligent circuit breaker handcart comprises an upper contact arm connected with an upper outlet seat, a lower contact arm connected with a lower outlet seat, a vacuum arc-extinguishing chamber connected between the upper outlet seat and the lower outlet seat, a monitoring system, and a contact arm measuring ring device; the monitoring system is used for monitoring the vacuum degree of the vacuum arc-extinguishing chamber, and the contact arm measuring annular device is used for monitoring current and temperature information of the contact arm. The device is used for solving the problems that in the prior art, the vacuum degree monitoring operation of a vacuum arc-extinguishing chamber in a high-voltage vacuum circuit breaker is complex and difficult to monitor in real time, the monitoring mode of a contact arm is single, and a temperature measurement result cannot be linked with the current.

Disclosure of Invention

Aiming at the problems and the technical requirements, the inventor provides a switch cabinet with improved electromagnetic locking state monitoring of an isolation handcart, and the switch cabinet can simply realize the required monitoring function.

The technical scheme of the utility model is as follows: the isolation handcart is arranged in a handcart room in the switch cabinet body, and the instrument door is arranged on a cabinet door outside the handcart room. The switch cabinet is internally provided with: a small bus power supply module and a locking power supply protection module; the isolation handcart is provided with a handcart locking loop module; the small bus power supply module comprises a small bus power supply positive terminal and a small bus power supply negative terminal; the locking power supply protection module comprises a miniature circuit breaker; the handcart locking loop module comprises a female circuit breaker and a locking electromagnet which are connected in series. The bus-tie circuit breaker is provided with a bus-tie circuit breaking contact and a bus-tie circuit breaking auxiliary point; the locking electromagnet is provided with an electromagnetic locking contact and an electromagnetic locking monitoring contact; the time relay comprises three pairs of terminals including a power terminal, a fault alarm terminal and an alarm output terminal. The isolation handcart is also provided with a locking loop monitoring module, a locking fault alarm module and a fault alarm output module; the locking loop monitoring module, the locking fault alarming module and the fault alarming output module are respectively connected with the female circuit breaker and the locking electromagnet in parallel. The locking loop monitoring module is formed by connecting a bus-tie circuit breaking auxiliary point of a bus-tie circuit breaker, an electromagnetic locking monitoring contact of a locking electromagnet and a power terminal in a time relay in series; the locking fault alarm module is formed by connecting a switch state display and a fault alarm terminal in the time relay in series; the fault alarm output module includes an alarm output terminal in the time relay.

In particular, a locking alarm lamp and a state display panel are arranged on the switch state display. The switch state display instrument is arranged on the instrument door.

In particular, the time relay is connected with the secondary voltage terminal; specifically, an alarm output terminal on the time relay is connected with the secondary voltage terminal.

In particular, two ends of a series connection circuit of the bus-bar circuit breaker and the locking electromagnet are respectively connected with a small bus power supply positive terminal and a small bus power supply negative terminal through the miniature circuit breaker.

The utility model has the advantages and effects that:

the time relay and the switch state display are configured by utilizing and developing auxiliary contacts of the bus-tie breaker and the latching electromagnet, so that the running state of the latching electromagnet is effectively monitored, and whether the latching electromagnet is burnt out due to faults or not is monitored. The automatic monitoring is real-time on-line, accurate, simple and stable, the monitoring mode is single, and the complex addition of components or linkage structure is not involved; the improved cost is low, the efficiency is high, the safety and the reliability are high, the service life is long, and the installation and maintenance workload is small.

Drawings

Fig. 1 is a schematic diagram of a circuit structure of a circuit breaker handcart in the prior art.

Fig. 2 is a schematic diagram of a circuit breaker handcart in embodiment 1 of the present utility model.

Fig. 3 is a schematic diagram of a switch status display according to embodiment 1 of the present utility model.

The reference numerals include:

the device comprises a 1-busbar power module, a 2-locking power protection module, a 3-handcart locking loop module, a 4-bus circuit breaker, a 5-miniature circuit breaker, a 6-locking electromagnet, a 7-switch state display, an 8-time relay and a 9-secondary voltage terminal;

41-bus-tie breaking contact and 42-bus-tie breaking auxiliary point;

61-electromagnetic latch contacts, 62-electromagnetic latch monitor contacts;

71-locking alarm lamp and 72-state display panel;

8A1, 8 A2-power terminals; 815. 818-a fault alert terminal; 825. 828-alarm output terminal;

101-positive terminal of the small bus power supply and 102-negative terminal of the small bus power supply.

The system comprises an A-locking loop monitoring module, a B-closed circuit fault alarm module and a C-locking fault alarm output module;

Detailed Description

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly attached, detachably attached, or integrally attached.

The principle of the utility model is that in order to monitor the operation state of the locking electromagnet 6, whether the locking electromagnet 6 is burnt out and fails due to long-term electrification is accurately judged in time, and besides the original common locking electromagnet is replaced by the locking electromagnet with the monitoring contact, a monitoring module is innovatively arranged around the working condition of the locking electromagnet 6 on the basis of the operation state of the locking circuit of the circuit breaker handcart. Of course, such improvements, while improving and enriching the handling functions and convenience, may correspondingly increase the complexity of existing systems, and therefore, the present utility model accomplishes the improvement based on the complexity system robustness requirements as succinctly as possible.

In the utility model, the isolation handcart is arranged in a handcart room in a switch cabinet body, and the instrument door is arranged on a cabinet door outside the handcart room.

In the utility model, a switch cabinet is internally provided with: a small bus power supply module 1 and a locking power supply protection module 2; the isolation handcart is provided with a handcart locking loop module 3; the small bus power supply module 1 comprises a small bus power supply positive terminal 101 and a small bus power supply negative terminal 102; the locking power protection module 2 comprises a miniature circuit breaker 5; the handcart locking circuit module 3 is connected with a bus-bar circuit breaker 4 and a locking electromagnet 6 in series.

The utility model is further described below with reference to the drawings and examples.

Example 1: the QF bus-tie breaker 4 is provided with a bus-tie breaking contact 41 and a bus-tie breaking auxiliary point 42; the A0 latching electromagnet 6 is provided with an electromagnetic latching contact 61 and an electromagnetic latching monitoring contact 62; KT time relay 8 includes three pairs of power terminals 8A1-8A2, fault alert terminals 815-818h and alert output terminals 825-828.

As shown in fig. 2, the isolation handcart is also provided with a locking loop monitoring module A, a locking fault alarm module B and a fault alarm output module C; the locking loop monitoring module A, the locking fault warning module B and the fault warning output module C are respectively connected with the female circuit breaker 4 and the locking electromagnet 6 in parallel.

The locking loop monitoring module A is formed by connecting a bus-tie circuit breaking auxiliary point 42 of the bus-tie circuit breaker 4, an electromagnetic locking monitoring contact 62 of the locking electromagnet 6 and power supply terminals 8A1 and 8A2 in the time relay 8 in series; the locking fault alarm module B is formed by connecting fault alarm terminals 815 and 818 in the switch state display 7 and the time relay 8 in series; the fault alert output module C includes alert output terminals 825, 828 in the time relay 8.

As shown in fig. 3, the ZSQ switch state indicator 7 is provided with a lock alarm lamp 71 and a state display panel 72.

In the foregoing, two ends of the series connection circuit of the bus-bar circuit breaker 4 and the latching electromagnet 6 are respectively connected with the positive terminal 101 of the +km small bus power supply and the negative terminal 102 of the-KM small bus power supply through the ZK miniature circuit breaker 5.

In the foregoing, ZSQ switch state indicator 7 is mounted on the instrument door.

In the foregoing, the KT time relay 8 is connected to the secondary voltage terminal 9; specifically, alarm output terminals 825, 828 on KT time relay 8 are connected to secondary voltage terminal 9.

In the embodiment of the utility model, a monitoring and alarming function module is arranged in an auxiliary way on the basis of an original circuit breaker loop, and the circuit breaker comprises a locking loop monitoring module A, a locking fault alarming module B and a fault alarming output module C; the locking circuit monitoring module A is formed by connecting a female connection circuit breaking auxiliary point 42 of the female connection circuit breaker 4, an electromagnetic locking monitoring contact 62 of the locking electromagnet 6 and power supply terminals 8A1 and 8A2 in the time relay 8; the locking fault alarm module B is formed by connecting fault alarm terminals 815 and 818 in the switch state display 7 and the time relay 8; the fault alarm output module C is composed of a secondary voltage terminal 9 and alarm output terminals 825, 828 in the time relay 8 connected.

In the embodiment of the utility model, the working power supplies of the small bus power supply positive electrode terminal 101 and the small bus power supply negative electrode terminal 102 are DC220V.

In the embodiment of the utility model, preferably, the QF bus-tie breaker 4 is HVX; the miniature circuit breaker 5 selects iC65N DC2P C A; the A0 latching electromagnet 6 is a DC220V 5SA522021/B product, and the product is provided with a latching monitoring contact 62, so that a monitoring loop can be supported; the KT time relay 8 is selected from an ABB CT series 3-300S 220-240VAC multifunctional time relay CT-ERS.21S AC/DC24V-240V 0.05s-300h 2C/O; ZSQ the switch state display 7 is a DC220V SHB 92-3 switch state display; the XT secondary voltage terminal 9 is UK-4N.

The embodiment of the utility model works:

1) When the Y0 latching electromagnet 6 is in a normal state:

a. when the QF bus bar breaker 4 is opened, that is, the bus bar breaking contact 41 is closed, the bus bar breaking auxiliary point 42 in the locking loop monitoring module a is closed, the electromagnetic locking contact 61 in the Y0 locking electromagnet 6 is electrically attracted, and the isolation handcart can be normally rocked into and out of operation, at this time, the electromagnetic locking monitoring contact 62 is switched from normally closed to normally open due to the fact that the Y0 isolation handcart locking electromagnet 6 is electrically connected. While at the same time. The locking monitoring loop in the locking loop monitoring module A is disconnected, and the KT time relay 8 is unpowered; ZSQ the status display panel 71 in the switch status display 7 blocks the alarm lamp from extinguishing.

b. When the QF bus-tie breaker 4 is switched on, namely the bus-tie breaking contact 41 is opened, the bus-tie breaking auxiliary point 42 in the locking loop monitoring module A is opened, the Y0 locking electromagnet 6 is not powered, namely the electromagnetic locking contact 61 is opened, and the isolation handcart cannot swing in and out; at this time, the bus bar disconnection assisting point 42 in the latch circuit monitor module a is opened, the electromagnetic latch monitor contact 62 is closed, the latch circuit monitor is opened, and the KT time relay 8 is unpowered. ZSQ the status display panel 71 in the switch status display 7 blocks the alarm lamp from extinguishing.

2) When the Y0 latching electromagnet 6 burns out and fails due to long-time electrification:

a. when the QF busbar breaker 4 is opened, that is, the busbar breaking contact 41 is closed, the busbar breaking auxiliary point 42 in the locking loop monitoring module a is closed, and the Y0 locking electromagnet 6 is burnt out and cannot be attracted, so that the isolation handcart cannot be operated. At this time, the busbar disconnection auxiliary point 42 in the lock monitoring circuit is closed, and the Y0 lock electromagnet 6 cannot be attracted, that is, the electromagnetic lock contact 61 is opened and cannot be attracted, but at this time, the electromagnetic lock monitoring contact 62 is closed, the lock monitoring circuit is closed, and the KT time relay 8 is energized. Further, as the KT time relay 8 has a time delay function, when the KT time relay 8 is powered on for a set time, the 815-818 fault alarm terminals are turned on, the locking fault alarm loop of the closed circuit fault alarm module B is turned on, and the locking alarm lamp 71 on the panel of the ZSQ switch state display 7 is normally on. In the KT time relay 8, 825-828 alarm output terminals are connected, the loop of the closed-circuit fault alarm module B is connected, and the background can receive the blocking fault alarm in time. Further, when the background receives the locking fault alarm, the operator on duty can be timely reminded to repair the locking loop of the isolation handcart, or the related accessories of the Y0 locking electromagnet 6 are replaced, so that the power running stability is improved.

The present utility model is not necessarily limited to the above embodiments, which are used to further explain the technical solution of the present utility model in detail. It is also possible for a person of ordinary skill to easily make several simple deductions or alternatives without going through the inventive work, without departing from the general idea of the utility model and that these all fall within the scope of protection defined by the claims submitted by the present utility model.

Claims (6)

1. The switch cabinet is characterized in that an electromagnetic locking state of an isolation handcart is monitored and improved, the isolation handcart is arranged in a handcart room in a switch cabinet body, and an instrument door is arranged on a cabinet door outside the handcart room; the switch cabinet is internally provided with: a small bus power supply module (1) and a locking power supply protection module (2); the isolation handcart is provided with a handcart locking loop module (3); the small bus power supply module (1) comprises a small bus power supply positive terminal (101) and a small bus power supply negative terminal (102); the locking power supply protection module (2) comprises a miniature circuit breaker (5); the handcart locking loop module (3) comprises a female circuit breaker (4) and a locking electromagnet (6) which are connected in series; the circuit breaker is characterized in that a bus-tie circuit breaker contact (41) and a bus-tie circuit breaker auxiliary point (42) are arranged on the bus-tie circuit breaker (4); an electromagnetic locking contact (61) and an electromagnetic locking monitoring contact (62) are arranged on the locking electromagnet (6); the time relay (8) comprises three pairs of terminals including power supply terminals (8A 1) - (8A 2), fault alarm terminals (815) - (818) and alarm output terminals (825) - (828); the isolation handcart is also provided with a locking loop monitoring module (A), a locking fault alarm module (B) and a fault alarm output module (C); the locking loop monitoring module (A), the locking fault alarming module (B) and the fault alarming output module (C) are respectively connected in parallel with the bus-tie circuit breaker (4) and the locking electromagnet (6); the locking loop monitoring module (A) is formed by connecting a bus-tie circuit breaking auxiliary point (42) of a bus-tie circuit breaker (4), an electromagnetic locking monitoring contact (62) of a locking electromagnet (6) and power supply terminals (8A 1) and (8A 2) in a time relay (8) in series; the locking fault alarm module (B) is formed by connecting fault alarm terminals (815) and (818) in a switch state display (7) and a time relay (8) in series; the fault alert output module (C) includes alert output terminals (825), (828) in the time relay (8).

2. The switch cabinet with improved electromagnetic locking state monitoring of the isolation handcart according to claim 1, wherein a locking alarm lamp (71) and a state display panel (72) are arranged on the switch state display (7).

3. The switch cabinet with improved electromagnetic latch-up status monitoring for isolation carts according to claim 1, wherein a time relay (8) is connected to the secondary voltage terminal (9).

4. The switch cabinet with improved electromagnetic locking state monitoring of the isolation handcart according to claim 1, wherein two ends of a series connection circuit of a bus bar breaker (4) and a locking electromagnet (6) are respectively connected with a small bus bar power supply positive terminal (101) and a-KM small bus bar power supply negative terminal (102) through a ZK miniature breaker (5).

5. The switch cabinet with improved electromagnetic latch-up status monitoring for isolation carts according to claim 2, wherein the switch status display (7) is mounted on the instrument door.

6. A switch cabinet with improved electromagnetic latch-up status monitoring for isolation carts according to claim 3, characterised in that the alarm output terminals (825), (828) on the time relay (8) are connected to the secondary voltage terminal (9).