Simulation method for detecting stability of liquid level relay

Abstract

The application provides a kind of liquid level relay stability simulation detection method, uses simulation detection device to carry out detection, simulation detection device includes simulation oil tank and alarm, simulation oil tank includes box, upper cover and oil pump, box is equipped with oil;The oil pump has two oil outlets, and the oil pump is pumped out from the lower part of the box, and discharged from the upper part of the box.The application uses alarm circuit to screen the liquid level relay with unstable quality, and eliminates the false alarm action during online operation.Adjust the liquid level of oil in the oil tank, so that the float ball always remains in the upper limit position, only one person is needed during the operation process, after installing the liquid level relay, connecting the plug, turning on the power supply of the oil pump and the alarm, according to the reaction of the alarm, the quality stability of the detected liquid level relay can be judged, and the detection is reliable and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, more particularly, to a simulation detection method for stability of a liquid level relay. BACKGROUND

[0002] The oil tank of a traction transformer of a train is filled with transformer oil, and a liquid level relay detects the oil surface height. The liquid level relay has three control gears, namely high position, low position and low-low position. When the oil surface height is at the high position, the relay will act to cut off the power supply, when the oil surface height is at the low position, an alarm signal is sent, and when the oil surface height is at the low-low position, the main circuit is cut off. The contact of the liquid level relay may be mis-closed due to quality problems when the oil surface in the oil tank is still at the high position, which causes the train to send a false alarm, and the train driver cannot determine whether it is a normal alarm at the low position or a false alarm at the high position. If it is a normal alarm at the low position, the train driver thinks it is a false alarm at the high position and does not handle it, and the liquid level continues to decrease to the low-low position, and the main power supply of the train is immediately cut off, which causes a major accident. Therefore, the train operation has high requirements on all aspects, and false alarm action is not allowed during online operation, and strict inspection must be performed before the liquid level relay is installed on the train. At present, there are two detection methods:

[0003] 1) Static detection: without disassembling the magnetic shielding cover of the liquid level relay, single-person operation is performed, the liquid level relay is vertically placed and inverted, the gravity is used to make the float ball stop at the upper limit position (high position) or the lower limit position (low-low position) of the core column, and then a multimeter is used to measure the on-off state of the contact connected with the core column.

[0004] 2) Random dynamic detection: the magnetic shielding cover of the liquid level relay is disassembled, two persons cooperate, one person holds the liquid level relay upside down and moves the float ball by hand, and the other person uses a multimeter to measure the on-off state of the contact connected with the core column.

[0005] The above two methods have the following disadvantages: the first detection method can only detect the on-off state of the contact in the static state, and the measurement by the multimeter requires close cooperation of both hands and eyes, and the labor intensity is very large; the second detection method requires two-person operation, one person holds the liquid level relay upside down and moves the float ball to rotate and shake, and the action needs to be extremely careful, otherwise the float ball will be separated from the upper limit position and the contact will be triggered, and the movement is random and greatly different from the actual running state; the other person uses a multimeter to measure, the needle needs to be always pressed, and the eyes need to be always observed.

[0006] At present, there is a lack of a reliable and efficient way to screen out liquid level relays with unstable quality before the liquid level relays are installed on the train. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a simulation detection method for the stability of a liquid level relay, which simulates the working conditions of the shaking and rotating movement of the float ball of the liquid level relay during online operation, screens the liquid level relay with unstable quality by using an alarm circuit, and eliminates the false alarm action during online operation.

[0008] The present application provides a simulation detection method for the stability of a liquid level relay, which uses a simulation detection device for detection, and the simulation detection device comprises a simulation oil tank and an alarm, the simulation oil tank comprises a tank body, an upper cover plate and an oil pump, and the tank body is filled with oil; the oil pump has two oil outlets, and the oil pump draws oil from the lower part of the tank body and discharges the oil from the upper part of the tank body; and the method comprises the following steps:

[0009] S1: remove the magnetic shielding cover of the liquid level relay, and install the liquid level relay on the simulation oil tank;

[0010] S2: pour oil into the tank body;

[0011] S3: observe the liquid level of the oil in the tank body, and make the float ball always keep at the upper limit position;

[0012] S4: stop pouring oil into the tank body;

[0013] S5: turn on the power supply of the oil pump, adjust the two oil outlets, make the oil flow staggered on both sides of the float ball, make the float ball shake, rotate and keep the maximum inclination, and simulate the working conditions of the liquid level relay during online operation of the equipment;

[0014] S6: electrically connect the alarm with the quick socket of the liquid level relay;

[0015] S7: turn on the power supply of the alarm, and observe and record the state of the alarm;

[0016] S8: if there is no alarm signal of the alarm during the detection of the liquid level relay, the liquid level relay is qualified;

[0017] S9: if there is an alarm signal of the alarm during the detection of the liquid level relay, the liquid level relay is abnormal, and the operator records the abnormal information.

[0018] The simulation detection method and simulation detection device for the stability of the liquid level relay are applied to the oil tank of a train traction transformer, and only one set of simulation detection device is needed to simulate the working condition of the liquid level relay during the on-line operation of the transformer. The two sides of the float ball are respectively provided with oil outlets, the heights of the two oil outlets are different, and the two oil outlets staggeredly flush the float ball during oil discharge, so that the float ball is always kept in a floating state and shakes and rotates to simulate the working condition of the liquid level relay during the on-line operation of the transformer. The box body is used for storing transformer oil, and the oil surface can be adjusted by increasing or decreasing the transformer oil to keep at a certain height, so as to generate sufficient buoyancy on the float ball of the liquid level relay installed on the upper cover plate, so that the float ball is always kept at the upper limit position. The alarm is connected to the quick socket of the liquid level relay, and the alarm gives an alarm when the liquid level relay is mis-closed at the upper limit position.

[0019] Further, in step S8, the manual test button on the liquid level relay is pressed again under the condition that the alarm has no alarm signal, to test whether the liquid level relay gives a signal when the float ball is away from the upper limit position, so as to ensure that the test is in a normal working state.

[0020] The liquid level relay comprises a socket, a float ball and a manual test button, wherein the manual test button is used to test whether a signal is given when the float ball is away from the upper limit position, the manual test button is pressed, the contact of the liquid level relay is closed, and a signal is outputted, which is used to detect whether the signal outputted by the detection equipment is normal.

[0021] Further, in step S4, the two oil outlets staggeredly flush the float ball, so that the rotating speed of the float ball is 1-2 revolutions per minute. The rotating speed of the float ball is 1-2 revolutions per minute, too fast speed will form a vortex near the float ball 2, and the float ball 2 is pulled down from the upper limit position, and too slow speed has no detection efficiency. Through many times of test and summary, the rotating speed of the float ball 2 is 1-2 revolutions per minute, which meets the detection requirement.

[0022] Further, the oil outlet of the oil pump is a three-way joint in communication with the outlet of the oil pump and bamboo joints in communication with two joints of the three-way joint, and the two bamboo joints are respectively arranged on the two sides of the float ball. In step S5, the bamboo joints are manually adjusted to change the position and angle of the oil outlet, so as to adjust the angle and position of the oil flow flushing the float ball, and the oil flow is staggeredly flushed on the two sides of the float ball. For the same type of liquid level relay, only the bamboo joints need to be adjusted during the first detection.

[0023] The bamboo joint has a certain rigidity and can be deformed at will under stress, so as to adjust the position and angle of the oil outlet to adjust the angle and position of the oil flow flushing the float ball. The oil outlet can also be a pipeline made of other materials which has a certain rigidity and is easy to deform under stress; or the oil outlet can be a structure which has a large rigidity and is not easy to deform, but has an auxiliary device to change the position and angle of the oil outlet.

[0024] Further, the oil pump is installed on the tank, and when detecting, the vibration of the oil pump makes the tank vibrate, so as to simulate the working condition of the liquid level relay in actual operation.

[0025] Further, the alarm is provided with a relay and an alarm element, and when the quality of the liquid level relay is unstable and the contact of the liquid level relay is closed by mistake, the relay contact responds, the alarm circuit is powered on, and the alarm element has an alarm signal.

[0026] Further, the alarm is connected with the socket of the liquid level relay through a plug, and the alarm comprises a self-locking circuit, when the quality of the liquid level relay is unstable and the contact of the liquid level relay is closed by mistake, the alarm is turned on, at this time, whether the contact of the liquid level relay is still closed or not, the circuit of the alarm is kept powered on, which is convenient for the tester to record.

[0027] After the alarm captures the action signal of the contact of the liquid level relay, the alarm signal is converted into a continuous audible and light alarm signal to remind the operator to record, and the alarm signal can also be other alarm modes, such as a buzzer and an indicator light.

[0028] Preferably, the alarm element is an audible and light alarm element.

[0029] Further, in step S1, the upper part of the simulated oil tank is provided with an upper cover plate, and the liquid level relay is fixedly installed on the upper cover plate.

[0030] The present application has the following beneficial effects:

[0031] The liquid level relay stability simulation detection method can be used for detecting the liquid level relay in a traction transformer oil tank, the alarm circuit is used for screening the liquid level relay with unstable quality, and the false alarm action in online operation is eliminated. The liquid level of the oil in the oil tank is adjusted, so that the float ball is always kept at the upper limit position, only one person is needed in the operation process, after the liquid level relay is installed, the plug is connected, the power supply of the oil pump and the alarm is turned on, according to the reaction of the alarm, the quality stability of the detected liquid level relay can be judged, and the detection is reliable and efficient. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings accompanying the specification of this application form a part of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and its description serve to explain the application without limiting the application in any way. In the drawings:

[0033] Figure 1 is a schematic view of a liquid level relay simulation detection device liquid level relay, a simulated oil tank and an oil pump installation structure.

[0034] Figure 2It is the analog detection device alarm structure schematic view of liquid level relay.

[0035] 1 - box, 2 - float ball, 3 - quick socket, 4 - bamboo joint pipe, 5 - tee joint, 6 - oil outlet pipe, 7 - oil pump, 8 - quick plug, 9 - alarm device, KA1 - coil, KA11 - contact, KA12 - contact, SB - reset button, HA - alarm element. DETAILED DESCRIPTION

[0036] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways limited and covered by the claims.

[0037] Example 1

[0038] An analog detection device of liquid level relay is provided, as shown in Figure 1 and Figure 2 , comprising an analog oil tank and an alarm, the analog oil tank comprising a box 1, an upper cover plate and an oil pump 7, the liquid level relay being installed on the upper cover plate, the upper cover plate being provided with a positioning structure for installing and positioning the liquid level relay; the box 1 is placed with oil, and the height of the oil surface keeps the float ball 2 of the liquid level relay always at the upper limit position; the oil pump 7 has an oil inlet pipe and an oil outlet pipe 6, the oil inlet pipe being communicated with the box 1 and located at the lower part of the box 1; the oil outlet pipe 6 is communicated with the box 1 and located at the upper part of the box 1; the oil outlet pipe 6 is connected with two bamboo joint pipes 4 through a tee joint 5, the tee joint 5 being fixed with the oil tank, and the oil outlet ports of the two bamboo joint pipes 4 being respectively placed at the two sides of the float ball 2; the heights of the oil outlet ports of the two bamboo joint pipes 4 are different, so that when the oil is discharged, the two oil outlet ports stagger to flush the float ball 2; the quick socket 3 of the liquid level relay is connected with the alarm (including a quick plug 8 and an alarm device 9), and when the liquid level relay appears false closure at the upper limit position, the alarm gives an alarm.

[0039] As shown in Figure 1 , the quick socket 3 of the liquid level relay is located above the upper cover plate, and the float ball 2 is located below the upper cover plate and immersed in the oil.

[0040] The oil pump 7 is installed on the box 1.

[0041] The analog detection device of the liquid level relay in the embodiment is used for detecting the normally open liquid level relay. The alarm device comprises a quick plug and an alarm device. The alarm device comprises a power supply, a reset button SB, an alarm element HA and an intermediate relay. The intermediate relay comprises a coil KA1 and two normally open contacts, i.e. a contact KA11 (contact one) and a contact KA12 (contact two). One end of the reset button SB is connected to the positive pole of the power supply, and the other end is connected to two branches. One branch is connected to the liquid level relay, the coil KA1 in sequence through the quick plug 8, the quick socket 3 and one end of the coil KA1, and the other end of the coil KA1 is connected to the negative pole of the power supply. The contact one KA11 is connected in parallel with the liquid level relay for self-locking. The other branch is that one end of the contact two KA12 is connected to the reset button SB, and the other end is connected to the alarm element HA. The other end of the alarm element HA is connected to the negative pole of the power supply.

[0042] The alarm element HA is an audible and visual alarm element.

[0043] The positioning structure on the upper cover plate is a groove which is matched with the mounting plate part of the liquid level relay.

[0044] The analog detection device of the liquid level relay in the embodiment is used for detecting the liquid level relay in the oil tank of the traction transformer, and excluding the liquid level relay with unstable quality and false alarm action. The tank 1 is used for storing transformer oil. The upper cover plate is provided with a groove which is beneficial to the installation of the liquid level relay. Figure 1 As shown in the figure, the oil pump 7 is connected to the tank 1 through an oil pipe for circulating and flushing the floating ball 2 in the tank 1. The tee joint 5 is fixed on the tank 1. The bamboo joint pipe 4 is connected to the oil outlet of the oil pump 7 through the tee joint 5 and the oil pipe. The plug of the alarm device is a quick plug 8 which can be quickly connected to and disconnected from the quick socket 3 of the liquid level relay. The alarm device can capture the signal of the contact of the liquid level relay and emit a continuous audible and visual alarm signal. If the quality of the liquid level relay is unstable, the contact of the liquid level relay is closed by mistake. The coil KA1 of the alarm device is electrified, and the two normally open contacts are closed. One contact KA11 is self-locked. At this time, whether the contact of the liquid level relay is still closed or not, the coil KA1 remains electrified, the contact KA11 and the contact KA12 are always closed, and the other contact KA12 is connected to make the audible and visual alarm element HA emit an alarm to remind the operator that the liquid level relay is abnormal. The operator can record the abnormal information, press the reset button SB to reset the alarm and remove the current liquid level relay. If it is necessary to continue the detection, it is only necessary to reinstall the liquid level relay to be detected.

[0045] Embodiment 2

[0046] A method for simulating and detecting the stability of the liquid level relay of the traction transformer by using the analog detection device of the liquid level relay in the embodiment, comprising the following steps:

[0047] S1: remove the magnetic shield cover of the liquid level relay, and install the liquid level relay to the simulation oil tank; fix the installation plate of the liquid level relay in the groove of the upper cover plate;

[0048] S2: pour oil into the tank body 1 of the simulation oil tank;

[0049] S3: observe the liquid level of the oil in the tank body 1, and make the float ball 2 always keep in the upper limit position;

[0050] S4: stop pouring oil into the tank body 1;

[0051] S5: turn on the power supply of the oil pump 7, manually adjust the bamboo joint pipe 4 to change the position and angle of the oil outlet, adjust the angle and position of the oil flow to flush the float ball 2, make the oil flow flush the float ball 2 alternately on both sides, make the float ball 2 float, swing and rotate, make the rotation speed of the float ball 2 be 1-2 turns per minute, and make the float ball 2 keep the maximum inclination, simulate the working condition of the liquid level relay when the equipment is running online;

[0052] S6: electrically connect the quick plug 8 of the alarm with the quick socket 3 of the liquid level relay;

[0053] S7: turn on the power supply of the alarm, and observe and record the state of the alarm;

[0054] S8: if there is no alarm signal of the alarm during the detection of the liquid level relay, press the manual test button on the liquid level relay again to test whether the liquid level relay sends a signal when the float ball 2 leaves the upper limit position, and ensure that the test is in the normal working state, then the liquid level relay is qualified;

[0055] S9: if there is an alarm signal of the alarm during the detection of the liquid level relay, the liquid level relay is abnormal, and the operator records the abnormal information; press the reset button SB, the alarm circuit is disconnected, and the alarm stops alarming.

[0056] The simulation detection of the embodiment is embodied in three aspects: 1, simulating the oil tank of the traction transformer; 2, simulating the actual working condition of the float ball 2 floating, swinging and rotating when the traction transformer is running; 3, simulating the actual working condition of the oil tank vibration when the traction transformer is running. Through the simulation detection device, the float ball 2 can be kept floating at the upper limit position; by adjusting the position of the bamboo joint pipe 4, the state of the float ball 2 swinging and rotating is changed; the rotating speed of the float ball is 1-2 revolutions per minute, too fast speed will form a vortex near the float ball 2, and pull the float ball 2 down from the upper limit position, too slow has no detection efficiency, the technical personnel summarizes through many times of test, the rotating speed of the float ball 2 is 1-2 revolutions per minute, which meets the detection requirements. The quick socket 3 is connected with the quick plug 8 of the alarm, which can ensure that the two are quickly connected and disconnected and the signal transmission is not wrong; through the alarm, the abnormal signal of the liquid level relay can be captured and continuous alarm can be sent; only the position of the bamboo joint pipe 4 needs to be adjusted when detecting for the first time, and the subsequent operation process only needs to install the liquid level relay, connect the quick plug 8, connect the oil pump 7 and the alarm power supply, the operation intensity is reduced, the operation efficiency is improved, the reliability is enhanced, and the unstable liquid level relay is strictly excluded.

[0057] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A method for simulating detection of stability of a liquid level relay, characterized by, The detection is performed by using a simulation detection device, which comprises a simulation oil tank and an alarm, and the simulation oil tank comprises a tank body, an upper cover plate and an oil pump, and the tank body is filled with oil; the upper part of the simulation oil tank is provided with the upper cover plate, a liquid level relay is fixedly installed on the upper cover plate, the quick socket of the liquid level relay is located above the upper cover plate, and a floating ball is located below the upper cover plate and immersed in the oil; the oil pump draws oil out from the lower part of the tank body and discharges the oil from the upper part of the tank body, and the oil pump has two oil outlets; and the method comprises the following steps: S1: remove the magnetic shielding cover of the liquid level relay, and install the liquid level relay on the upper cover plate of the simulation oil tank; S2: pour oil into the tank body; S3: observe the liquid level of the oil in the tank body, and make the floating ball always keep at the upper limit position; S4: stop pouring oil into the tank body; S5: turn on the power supply of the oil pump, adjust the two oil outlets, make the oil flow staggered on both sides of the floating ball, make the floating ball swing and rotate, and make the floating ball keep the maximum inclination, and simulate the working condition of the liquid level relay during online operation of the equipment; S6: electrically connect the alarm with the quick socket of the liquid level relay; S7: turn on the power supply of the alarm, and observe and record the state of the alarm; S8: if there is no alarm signal of the alarm during the detection of the liquid level relay, the liquid level relay is qualified; S9: if there is an alarm signal of the alarm during the detection of the liquid level relay, the liquid level relay is abnormal, and the operator records the abnormal information.

2. The method of claim 1, wherein In step S8, under the condition that there is no alarm signal of the alarm, the manual test button on the liquid level relay is pressed again to test whether the liquid level relay sends a signal when the floating ball leaves the upper limit position, so as to ensure that the test is in a normal working state.

3. The method of claim 1, wherein the method further comprises: In step S4, the two oil outlets staggeredly wash the floating ball, and the rotating speed of the floating ball is 1-2 revolutions per minute.

4. The method of claim 1, wherein The two oil outlets are respectively connected with angle adjusting mechanisms, and in step S5, the angle adjusting mechanisms are adjusted to change the positions and angles of the oil outlets, adjust the angles and positions of the oil flow washing the floating ball, and make the oil flow staggered on both sides of the floating ball.

5. The method of claim 4, wherein the method further comprises: The oil outlet of the oil pump is a three-way joint communicated with the outlet of the oil pump and bamboo joints communicated with two joints in the three-way joint, and the two bamboo joints are respectively arranged on both sides of the floating ball, and in step S5, the bamboo joints are manually adjusted to change the positions and angles of the oil outlets, adjust the angles and positions of the oil flow washing the floating ball, and make the oil flow staggered on both sides of the floating ball; for the liquid level relays of the same type, only the bamboo joints need to be adjusted during the first detection.

6. The method of claim 1, wherein The oil pump is installed on the tank body, and during the detection, the vibration of the oil pump makes the simulation oil tank vibrate, so as to simulate the actual working condition of the liquid level relay.

7. The method of claim 1, wherein The alarm is provided with a relay and an alarm element, and in step S9, when the quality of the liquid level relay is unstable and the contact of the liquid level relay appears misoperation closure, the alarm circuit is electrified, and the alarm element has an alarm signal.

8. The method of claim 7, wherein the method further comprises: The alarm is connected with the socket of the liquid level relay through a plug, and the alarm comprises a self-locking circuit, when the quality of the liquid level relay is unstable and the contact of the liquid level relay appears misoperation closure, the alarm is turned on, at this time, whether the contact of the liquid level relay is still closed or not, the circuit of the alarm remains electrified, which is convenient for the tester to record.

9. The method of claim 8, wherein the method further comprises: The alarm element is an audible and visual alarm element, and during the detection, the alarm signal of the audible and visual alarm element is observed and listened to.

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