CN218868096U - Power cabinet system of electric locomotive overhaul warehouse - Google Patents

Abstract

The utility model is suitable for an electric locomotive warehouse low-voltage test technical field provides an electric locomotive overhauls storehouse power cabinet system, insert to three current transformer of three-phase line including the one-to-one, still include reverse order contactor, positive order contactor, comparison relay and control module, further still include three routes voltage transformer. The three-way current sensor collects and converts the detected analog quantity, calculates the sum of the current values and compares and judges the current values, further determines whether the steering is correct, automatically converts the phase sequence of the steering error, locks the contactor which is correctly steered to continuously work, does not need manual intervention, omits the complex processes of manual power off, check confirmation and call response, greatly improves the work efficiency and greatly reduces the safety risk.

Description

Power cabinet system of electric locomotive overhaul warehouse

Technical Field

The utility model belongs to the technical field of the low-voltage test in the electric locomotive storehouse, especially, relate to an electric locomotive overhauls storehouse power cabinet system.

Background

Aiming at the low-voltage test of an electric locomotive in a garage, a power cabinet for a three-phase 380V garage is used for supplying power to an auxiliary motor of the locomotive, the U, V and W three-phase splitting mode and the wiring specification of a power supply of an auxiliary circuit of the locomotive are inconsistent with those of a three-phase power supply for a ground garage, the auxiliary motor of the locomotive has 50% of reversal probability, the phase sequence of the auxiliary circuit of the locomotive and the steering of the auxiliary motor of the locomotive need to be manually checked after power is supplied, the phase sequence needs to be manually reversed after power is cut off under the reverse condition, then the test is supplied with power again, the whole process needs to be checked, confirmed and called for responding for multiple times, the working efficiency is low, and greater safety risk exists.

In the fields of industrial and commercial power supply and civil power utilization, a power supply phase sequence protection device is provided, and only protective turn-off of a power supply can be realized, but automatic switching of a phase sequence cannot be realized. In the field of operation and maintenance of railway rolling stocks, the low-pressure test mode is still adopted at present.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, an object of the utility model is to provide an electric locomotive overhauls storehouse switch board system has solved the technical problem that current mode work efficiency is low, there is great safety risk.

The utility model adopts the following technical scheme:

the electric locomotive overhauls storehouse power cabinet system includes that the one-to-one inserts to three current transformer of three-phase line, still includes reverse sequence contactor, positive sequence contactor, comparison relay and control module, the three-phase line is connected to the socket for the storehouse through the reverse sequence switch of reverse sequence contactor is reverse, the three-phase line is connected to the socket for the storehouse through the positive switch forward of positive sequence contactor, the coil of reverse sequence contactor, positive sequence contactor inserts to one of them looks circuit through two sets of interlock switches of comparison contactor respectively, this circuit is the working circuit, control module inserts the working circuit equally, access to working power supply after the comparison switch of comparison relay and the coil connection of comparison contactor, control module is including analog-to-digital converter, adder and the comparator that connects in order, the output control of comparator the comparison switch of comparison relay.

Furthermore, a three-phase automatic air circuit breaker is connected to the three-phase line.

Furthermore, a fuse is connected to the working line.

Furthermore, three voltage transformers are connected to the three-phase line, a monitoring module is connected between the working line and the central point, and the three voltage transformers are connected to the monitoring module.

Furthermore, a cabinet door interlocking protection travel switch is connected to the working circuit.

The utility model has the advantages that: the utility model discloses a set up three current transformer and reverse order contactor, the positive order contactor, comparison relay, control module etc, control module includes analog to digital converter, adder and comparator, three routes current data through gathering three-phase line, then calculate through the adder, and compare with the value according to the comparator, the break-make of relevant contactor of control and controller, the switching phase sequence of socket for the storehouse has been realized, need not manual intervention, save loaded down with trivial details manual power failure, the inspection is confirmed and is called the answer process, not only can improve the work efficiency greatly, and the safety risk has greatly been reduced.

Drawings

Fig. 1 is a schematic diagram of a power cabinet system of an electric locomotive overhaul warehouse provided by an embodiment of the invention;

fig. 2 is a schematic diagram of a control module according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to explain the technical solution of the present invention, the following description is made by using specific examples.

As shown in fig. 1 and 2, the power supply cabinet system for an electric locomotive overhaul warehouse provided in this embodiment includes three current transformers that are connected to three-phase lines in a one-to-one correspondence manner, and in the illustration, the three-phase lines are respectively marked as L1, L2, and L3, current values output by the three current transformers are HL1, HL2, and HL3, the system further includes a reverse-sequence contactor, a forward-sequence contactor, a comparison relay, and a control module, in the illustration, a forward switch of the forward-sequence contactor is marked as KM1, a coil is marked as KJ1, a reverse switch of the reverse-sequence contactor is marked as KM2, a coil is marked as KJ2, a coil of the comparison contactor is marked as KJ3, two sets of interlock switches are respectively marked as KM3 and KM3', and a comparison switch of the comparison relay is marked as KM4.

The three-phase line is reversely connected to the socket for the warehouse through a reverse switch KM2 of the reverse contactor, three-phase contacts of the socket for the warehouse are respectively U, V and W, the three-phase line is positively connected to the socket for the warehouse through a forward switch KM1 of the positive contactor, coils of the reverse contactor and coils of the positive contactor are respectively connected to one phase line through two groups of interlocking switches of the comparison contactor, the line is a working line, and the illustrated working line is L1. The control module is also connected to the working circuit, a comparison switch KM4 of the comparison relay and a coil KJ3 of the comparison contactor are connected and then connected to a working power supply, and the working power supply is 24V. The control module comprises an analog-to-digital converter, an adder and a comparator which are connected in sequence, and the output end of the comparator controls a comparison switch of the comparison relay.

Taking a direct current electric locomotive as an example, when a low-voltage test is carried out in a maintenance warehouse, the specific process mode of the system is as follows:

three-phase AC output power line of power cabinet system three-phase line is connected with the socket for the storehouse of locomotive through positive sequence and reverse sequence contactor to with the socket for the storehouse of arbitrary traction fan individual connection storehouse of locomotive, the power cabinet is self-checking earlier, for example carry out overvoltage under-voltage detection earlier, then start the power cabinet through remote switch, under the default condition, interlock switch KM3 acquiescence switches on, KM3' breaks off, coil KJ1 switches on, the forward switch KM1 of positive sequence contactor inserts three-phase AC power supply, the socket for the storehouse is electrified. The three current transformers carry out overcurrent (phase failure) detection, after the traction fan is started and stably works for 2 seconds, the analog-to-digital converter collects three paths of current data, then the sum of the three paths of current values is calculated through the adder, the sum is compared with a normal parameter value in a system through the comparator, and if the sum is within the range, the working state of the positive-sequence contactor is kept unchanged.

As an optimal mode, the power cabinet is provided with a touch screen and a voice prompt module, prompts can be performed on the touch screen, and corresponding voice prompt information is sent out at the same time, so that the locomotive can perform subsequent low-voltage tests. If the sum of the current values is lower than the normal parameter values in the system, which indicates that the traction fan rotates reversely, the comparison switch KM4 of the comparison relay is controlled to be switched on, the coil KJ3 is electrified, the interlocking switch KM3 is switched off, the positive sequence contactor is switched off, the switch KM3' is switched on, the coil KJ2 is electrified, the reverse switch KM2 is switched on, namely, the positive contactor is connected to a three-phase alternating current power supply, current data acquisition and comparison are carried out in the same mode, and once the set conditions are met, the working state of the contactor is kept to work continuously. Therefore, the circuit system can automatically detect the steering of the traction fan, automatically complete the phase sequence switching without manual intervention, save the complex manual power-off, check confirmation and call response processes, greatly improve the work efficiency and greatly reduce the safety risk. The implementation manner of controlling the comparison switch of the comparison relay by the output end of the comparator can be, for example: the 24V working power supply is connected to the ground through the electromagnetic switch and the coil of the comparison relay, when the sum of current values is smaller than a normal parameter value, a switching value signal is output, the electromagnetic switch is switched on, the coil of the comparison relay is electrified, and the comparison switch of the comparison relay is switched on.

Furthermore, three voltage transformers can be connected to the three-phase line, the three voltages are DA1, DA2 and DA3, a monitoring module is connected between the working line and the central point, and the three voltage transformers are connected to the monitoring module. During the operation of the power cabinet, overvoltage and undervoltage detection, overcurrent (open-phase) detection and the like can be carried out, if the external main power supply has power failure, the system is indicated to keep in a quit state until the low-voltage test process is finished.

The power cabinet of the embodiment is provided with the touch display screen with the voice output, and the output phase sequence of the three-phase alternating-current power supply is controlled by driving the switching positive-sequence contactor and the switching negative-sequence contactor. Various detection and monitoring parameters in the working process of the intelligent power cabinet are displayed on a screen, and corresponding voice prompts exist in the working process. An automatic change-over switch and a manual change-over switch can be arranged on the panel of the cabinet, and two operation options can ensure emergency use under the condition of failure. Corresponding protection parameters may be set for different types of locomotives.

In addition, a three-phase automatic air circuit breaker SQ is connected to the three-phase line, and a fuse FU is connected to the working line, so that the working safety is guaranteed. The last access of working line has cabinet door interlocking protection travel switch (not shown in the figure), and the maintenance auto-power-off that opens the door prevents that the electrified maloperation of equipment from leading to the electric shock accident.

The control principle of the power cabinet is based on different characteristics of the turbofan used by the traction fan of the electric locomotive in forward rotation and reverse rotation to carry out intelligent control. When the turbofan rotates forwards, the driving motor works under the full-load working condition, and the load current is the rated current; when the turbofan rotates reversely, the output wind direction is unchanged, but the wind pressure is very low, the driven three-phase alternating current asynchronous motor is close to the no-load working condition, and the working current is no-load current. The rated current of the three-phase alternating current asynchronous motor is greatly different from the no-load current, the current sensor is used for collecting and converting the detected analog quantity, the current value is calculated and compared and judged, whether the steering is correct or not is further determined, the phase sequence of the steering error is automatically converted, and the contactor which is correctly steered is locked to continuously work. In addition, each phase circuit of the three-phase alternating current power supply is provided with a current sensor and a voltage sensor, the analog quantities are collected in real time, and the industrial personal computer monitors in real time to provide comprehensive and reliable overload, short circuit, phase failure, undervoltage and overvoltage protection for the locomotive and the power supply cabinet. The whole process does not need manual intervention, and complex manual power-off, check confirmation and call response processes are omitted, so that the working efficiency can be greatly improved, and the safety risk is greatly reduced.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The utility model provides an electric locomotive overhauls storehouse power cabinet system, its characterized in that, the power cabinet system includes that the one-to-one inserts to three current transformer of three-phase line, still includes reverse sequence contactor, positive sequence contactor, comparison relay and control module, the three-phase line is connected to the socket for the storehouse through the reverse sequence switch of reverse sequence contactor is backward, the three-phase line is connected to the socket for the storehouse through the forward switch forward of positive sequence contactor, the coil of reverse sequence contactor, positive sequence contactor inserts to one of them looks circuit through two sets of interlock switches of comparison contactor respectively, and this circuit is the working line, control module inserts the working line equally, access to working power supply in order after the comparison switch of comparison relay and the coil connection of comparison contactor, control module includes analog-to-digital converter, adder and the comparator that connect, the output control of comparator the comparison switch of comparison relay.

2. The electric locomotive service depot power cabinet system of claim 1, wherein a three-phase automatic air circuit breaker is further connected to the three-phase line.

3. The electric locomotive service depot power cabinet system of claim 2, wherein a fuse is connected to the working line.

4. The electric locomotive service bay power cabinet system of claim 3, wherein a three-way voltage transformer is further coupled to the three-phase line, a monitoring module is further coupled between the working line and the central point, and the three-way voltage transformer is coupled to the monitoring module.

5. The electric locomotive overhaul depot power cabinet system of claim 3, wherein a cabinet door interlocking protection travel switch is connected to the working line.

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