Portable tester for steel rail potential limiting device

Abstract

The utility model provides a portable tester for a steel rail potential limiting device. The portable tester comprises an input terminal, an output terminal, a power supply module, a change-over switch and a display module. And the input terminal and the output terminal are connected with a steel rail potential limiting device to be measured. And the power supply module is externally connected with a power supply and is converted into direct-current adjustable voltage to be output. And the change-over switch is arranged between the power supply module and the output terminal. The display module comprises a voltmeter, a switching-on indicating lamp and a timer, the voltmeter is connected with the output terminal in parallel, the switching-on indicating lamp is connected with the input terminal, and the timer is connected with the change-over switch. The portable tester provided by the utility model is light and portable, can be operated by a single person, and greatly improves the equipment test efficiency.

Description

Technical Field

[0001] The utility model relates to the field of electrical testing, in particular to a portable tester for a rail potential limiting device. Background Art

[0002] In urban rail transit, the rails are not completely insulated from the ground, so part of the load current will flow through metal facilities such as the rails and roadbeds. Due to the leakage resistance between the rails and the ground, when the train is running or a short circuit occurs in the system, a potential difference will be generated, which may bring serious safety hazards. In order to ensure the safety of passengers and staff, the rail transit power supply system is specially equipped with a rail potential limiting device. When this device detects that the rail voltage to the ground exceeds the set safety value, it will quickly short-circuit the rail to the ground to avoid potential risks.

[0003] According to the "Shanghai Metro Relay Protection Equipment Preventive Test Procedure", a preventive test of the rail potential limiting device is required every year. During the test, the construction personnel will use a special PW30AE relay protection tester to calibrate the voltage sampling points inside the equipment. They will add a DC voltage between the negative terminal and the ground terminal of the sampling point to verify whether the device can operate normally at the set first-order setting value of 90V and the second-order setting value of 150V.

[0004] However, although the PW30AE relay protection tester is powerful and weighs about 22 kilograms, it mainly uses the DC voltage addition function in the setting value verification of the rail potential limiting device, and many other functions are not fully utilized. In addition, since the power supply equipment room is usually located in a specific location of the station, such as outside the end door close to the track area or the mezzanine of the station hall, such a special geographical location makes it extremely difficult to carry the heavy tester. Construction workers often need to spend a lot of manpower and time to move the tester to the workplace, which undoubtedly reduces the efficiency of equipment testing.

[0005] In summary, in the preventive test of rail potential limiting device, the traditional test instruments not only have low functional utilization, but also are bulky and difficult to carry, which brings many inconveniences to the construction process and greatly reduces the efficiency of equipment testing. Utility Model Content

[0006] The utility model aims to provide a portable tester for a rail potential limiting device, which is lightweight and portable and can be operated by one person, thereby improving the efficiency of equipment testing.

[0007] In order to achieve the above object, the utility model provides a portable tester for a rail potential limiting device, comprising:

[0008] Input terminals and output terminals, wherein the input terminals and the output terminals are connected to a rail potential limiting device to be measured;

[0009] A power module, which is connected to an external power source and converts it into a DC adjustable voltage output;

[0010] A conversion switch, wherein the conversion switch is arranged between the power module and the output terminal;

[0011] The display module includes a voltmeter, a closing indicator light and a timer. The voltmeter is connected in parallel with the output terminal, the closing indicator light is connected with the input terminal, and the timer is connected with the conversion switch.

[0012] In one embodiment, the input terminal is connected to an auxiliary relay in the rail potential limiting device to be measured, and the auxiliary relay operates synchronously when the rail potential limiting device is opened and closed.

[0013] In one embodiment, the portable tester of the rail potential limiting device also includes an intermediate relay, which is also connected to the auxiliary relay. The intermediate relay is connected to the closing indicator light, and the timer is set between the transfer switch and the intermediate relay.

[0014] In one embodiment, the intermediate relay includes a connected coil and a normally open contact, the coil of the intermediate relay is connected to the power module, the coil of the intermediate relay is connected to the auxiliary relay, and the normally open contact of the intermediate relay is connected to the closing indicator light.

[0015] In one embodiment, the input terminal and the intermediate relay are connected to the normally open contact R33 and the normally closed contact R34 of the auxiliary relay K56 in the rail potential limiting device to be measured.

[0016] In one embodiment, the power module comprises:

[0017] A power interface, the power interface is connected to an external power source;

[0018] A power switch connected to the power interface;

[0019] A voltage conversion module, wherein the voltage conversion module is connected to the power switch;

[0020] The stepless rotary knob switch is connected to the voltage conversion module, and the stepless rotary knob switch is connected to the conversion switch.

[0021] In one embodiment, the portable tester for the rail potential limiting device further comprises a housing having a first side and a second side adjacent to each other;

[0022] The power interface and the power switch are arranged on the first side of the shell, the voltage conversion module is arranged inside the shell, and the input terminal, the output terminal, the stepless knob switch, the conversion switch, and the display module are all arranged on the second side of the shell.

[0023] In one embodiment, the housing is made of ABS plastic.

[0024] In one embodiment, the portable test meter weighs less than 1 kilogram.

[0025] In one embodiment, the output terminal and the input terminal are connected to the potential limiting device of the rail to be measured through clamp-type wiring terminals.

[0026] The portable tester for the rail potential limiting device proposed by the utility model has the following beneficial effects:

[0027] (1) The portable tester is lightweight and portable and can be carried by one person.

[0028] (2) The portable tester can achieve a precisely adjustable DC output voltage of 0 to 220 V, meeting the requirement of adding first- and second-order set value action voltages to the device under test.

[0029] (3) The portable tester realizes feedback of the closing and opening status of the device under test by connecting to the auxiliary contacts of the partial closing circuit in the device under test.

[0030] (4) The portable tester can measure the operating time of the device under test after reaching the set voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of a portable tester for a rail potential limiting device according to an embodiment of the utility model;

[0032] Figure 2 It is a schematic diagram of a voltage conversion or output circuit of a rail potential limiting device according to an embodiment of the utility model;

[0033] Figure 3 It is a schematic diagram of some of the opening and closing circuits in the rail potential limiting device to be tested;

[0034] Figure 4 The figure is a schematic diagram of a control circuit of a rail potential limiting device according to an embodiment of the utility model.

[0035] Reference numerals

[0036] Portable tester 1, input terminal 11, output terminal 12, voltmeter 13, timer 14, closing indicator light 15, transfer switch 16, stepless knob switch 17. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0038] The utility model provides a portable tester 1 for a rail potential limiting device, comprising: an input terminal 11, an output terminal 12, a display module, a power module, and a conversion switch 16, wherein the display module comprises a voltmeter 13, a closing indicator light 15, and a timer 14, see Figure 1 .

[0039] The input terminal 11 and the output terminal 12 are connected to the rail potential limiting device to be tested (hereinafter referred to as the device to be tested), and the portable tester 1 outputs voltage to the device to be tested through the output terminal 12 to complete the preventive test of the rail potential limiting device, and the state signal of the device to be tested is introduced into the portable tester 1 through the input terminal 11. In this embodiment, the input terminal 11 is connected to the auxiliary relay K56 of the opening and closing circuit in the rail potential limiting device, and the auxiliary relay K56 acts synchronously when the rail potential limiting device is opened and closed.

[0040] The power module is connected to an external power source and converted into a DC adjustable voltage output. In this embodiment, the power module is connected to an external 220V AC power. In a specific embodiment, the power module includes: a power interface, a power switch, a voltage conversion module and a stepless knob switch 17. Among them, the power interface is connected to an external power source to provide power for the tester 1. The power switch is connected to the power interface to control the on and off of the power supply to ensure safe use. The voltage conversion module is connected to the power switch to convert the AC power obtained from the outside into DC power to meet the needs of the tester 1 and the device to be tested. The stepless knob switch 17 is connected to the voltage conversion module to adjust the size of the output DC voltage. The stepless knob switch 17 allows the user to continuously adjust the size of the output DC voltage to adapt to different test requirements. In this embodiment, a DC 0-220V adjustable voltage output can be achieved through the stepless knob switch. Specifically, the power interface is connected to 220V AC power. When the power switch is turned on, the 220V AC power is converted into DC voltage by the voltage conversion module, and the 0-220V adjustable DC voltage output is realized through the stepless knob switch 17, so as to add a DC voltage to the negative terminal of the voltage sampling point inside the device to be tested and to the ground terminal, see Figure 2 .

[0041] The conversion switch 16 is arranged between the power module and the output terminal 12, and the conversion switch 16 is used to control whether the voltage output by the power module is transmitted to the output terminal 12, and then applied to the rail potential limiting device to be tested.

[0042] The voltmeter 13 is connected in parallel to the output terminal 12 to measure the output value of the DC adjustable voltage in the power module. The closing indicator light 15 is connected to the input terminal 11. When the device under test responds normally to the test voltage output by the power module and closes, the closing signal will be transmitted to the inside of the tester through the input terminal 11, triggering the closing indicator light to light up. This connection method ensures that the indicator light can accurately reflect the status of the device under test and provide intuitive visual feedback. The timer 14 is connected to the conversion switch 16. While controlling the voltage addition, the conversion switch 16 is also responsible for triggering the start of the timer 14. Once the conversion switch 16 is closed, the timer 14 starts timing and records the time from the application of voltage to the closing of the rail potential limiting device under test.

[0043] Furthermore, the portable tester 1 of the rail potential limiting device further comprises an intermediate relay K1, which is also connected to the auxiliary relay K56, and is connected to the closing indicator light 15, and the timer 14 is arranged between the conversion switch 16 and the intermediate relay K1. The intermediate relay K1 is used to feedback the opening and closing status of the rail potential limiting device.

[0044] Further, the intermediate relay K1 includes a connected coil and a normally open contact, the coil is connected to the auxiliary relay K56, and the normally open contact of the intermediate relay K1 is connected to the closing indicator light 15. In addition, the coil of the intermediate relay is connected to the power module so that K1 can be activated by the current provided by the power module when needed. Specifically, the transmission process of the opening and closing signal in the auxiliary relay K56 is as follows: when the potential limiting device of the rail to be tested performs the opening and closing action, the contact state (normally open or normally closed) of the auxiliary relay K56 will change, and these changes are transmitted to the portable tester 1 through the input terminal 11 connected to the contact of the auxiliary relay K56. The auxiliary relay K56 state signal received by the portable tester 1 through the input terminal 11 is further transmitted to the intermediate relay K1. If the signal meets the action condition of the intermediate relay K1 (for example, the normally open contact of K56 is closed), the coil of the intermediate relay K1 will be energized. When the coil of the intermediate relay K1 is energized, its normally open contact closes, thereby forming a path so that current can flow through the closing indicator light to light up the closing indicator light. In this way, the state of the closing indicator light reflects the state change of K56, that is, it reflects the opening and closing conditions of the rail potential limiting device. In summary, the input terminal 11 serves as the signal input to transmit the state change of the auxiliary relay K56 to the portable tester 1. The intermediate relay K1 serves as a signal processing and control element to control the state of the closing indicator light according to the received signal. In this way, the portable tester 1 can monitor and feedback the operation of the rail potential limiting device.

[0045] like Figure 3As shown, the input terminal 11 is connected to the normally open contact R33 and the normally closed contact R34 of the auxiliary relay K56 in the rail potential limiting device to be tested. Specifically, the opening and closing conditions of the rail potential limiting device are fed back through the changes in the normally open contact R33 and the normally closed contact R34 of the auxiliary relay K56, and are reflected by the closing indicator light 15. When the normally open contact R33 of the auxiliary relay K56 is closed, the coil of the intermediate relay K1 is energized, so that the normally open contact of the intermediate relay K1 is closed to light up the closing indicator light 15. In a specific embodiment, Figure 4 As shown in the figure, a voltage exceeding the set value is added to the voltage sampling point inside the rail potential limiting device. If the device to be tested (such as Figure 4 If NK11 in the circuit breaker is normal, the circuit breaker will be closed and its normally open contact K0 will be closed, so that the coil of the intermediate relay K1 will be energized, driving the normally open contact of the intermediate relay K1 to close, and the closing indicator light 15 will light up.

[0046] Furthermore, the portable tester for the rail potential limiting device also includes a housing having a first surface and a second surface adjacent to each other. The power interface and the power switch are arranged on the first surface of the housing, the voltage conversion module is arranged inside the housing, and the input terminal 11, the output terminal 12, the stepless knob switch 17, the conversion switch 16, and the display module are all arranged on the second surface of the housing. In this embodiment, the housing is preferably made of ABS plastic. The properties of ABS plastic, such as good insulation, low density, and good heat resistance, meet the requirements of electrical insulation and heat resistance, and are competent for various functional verification tasks in the preventive test of the rail potential limiting device.

[0047] Furthermore, the weight of the portable tester is less than 1 kg. Since the portable tester is a lightweight test instrument designed for preventive testing of rail potential limiting devices, its weight is less than 1 kg, meeting the portability requirement. In this embodiment, the portable tester preferably weighs 0.75 kg, and the dimensions of the portable tester are 265 mm long × 185 mm wide × 95 mm high. The portable tester achieves the purpose of being lightweight and portable, and can be carried by one person.

[0048] Furthermore, the output terminals and the input terminals are connected to the rail potential limiting device to be tested through clamp-type terminal blocks, meeting the requirements for adapting to MF series and T series rail potential limiting devices.

[0049] The portable tester of the rail potential limiting device of the first embodiment of the utility model shows excellent use effect, which is specifically reflected in the following aspects:

[0050] First of all, the portable tester has an excellent voltage output function. The tester can be powered by an AC 220V power supply and output a precise and adjustable voltage of 0-220V through a voltage conversion module, a stepless knob switch, and a digital voltmeter. This function is adapted to the clamp-type terminal block and can perfectly match various types of equipment in the entire road network. In order to verify the stability and accuracy of the voltage output, we connected a multimeter to the output terminal of the tester. The results showed that the DC voltage output by the instrument was continuous, stable, and adjustable. The display of the panel voltmeter was consistent with the voltage measured by the multimeter (error ≤1%), which fully proved the normality of the voltage output function.

[0051] Secondly, the portable tester has signal monitoring function and action time measurement function. By connecting the input terminal of the tester to the normally open or normally closed contact of the auxiliary relay of the rail potential limiting device's closing and opening circuit, the tester can monitor the action state of the equipment in real time, including the change of normally open and normally closed state. These state changes will be fed back to the intermediate relay of the portable tester in time, so as to control the closing indicator light to display the corresponding state. In addition, by controlling the opening and closing of the conversion switch, a constant voltage greater than the set value can be output to the equipment, and the built-in timer can be used to accurately record the instantaneous action time of the equipment. In a specific embodiment, the timer displays 1.24 seconds.

[0052] Finally, the portable tester also has a setting value verification function. By adding the first and second order setting value action voltages to the negative terminal and the ground terminal of the voltage sampling point inside the rail potential limiting device, and using the intermediate relay, closing indicator light and voltmeter inside the tester, we can accurately determine the voltage addition value and the action of the rail potential limiting device. After testing, the rail potential limiting device can operate according to the preset first and second stage setting values, and successfully complete the closing, opening and locking operations, thereby verifying the effectiveness of the setting value verification function.

[0053] In summary, this portable tester performs well in the application of rail potential limiting device. It not only has accurate voltage output function, but also can effectively monitor equipment signals, measure action time and verify setting values, providing strong guarantee for the safe and stable operation of the railway system.

[0054] In short, the portable tester for rail potential limiting device proposed in the utility model has the following beneficial effects:

[0055] (1) The portable tester is lightweight and portable and can be carried by one person.

[0056] (2) The portable tester can achieve a precisely adjustable DC output voltage of 0 to 220 V, meeting the requirement of adding first- and second-order set value action voltages to the device under test.

[0057] (3) The portable tester realizes feedback of the closing and opening status of the device under test by connecting to the auxiliary contacts of the partial closing circuit in the device under test.

[0058] (4) The portable tester can measure the operating time of the device under test after reaching the set voltage.

[0059] It should be noted that, unless otherwise clearly specified and limited, the words "set", "connected", "connection" and other similar words used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0060] The above-mentioned embodiments are only further explanations of the utility model, and are not intended to limit the utility model in other forms. The utility model may also have other various embodiments. Without departing from the spirit and essence of the utility model, those skilled in the art may make various corresponding modifications and changes according to the utility model, but these corresponding modifications and changes shall fall within the protection scope of the utility model.

Claims

1. A portable tester for a rail potential limiting device, characterized in that: include: Input terminals and output terminals, wherein the input terminals and the output terminals are connected to a rail potential limiting device to be measured; A power module, which is connected to an external power source and converts it into a DC adjustable voltage output; A conversion switch, wherein the conversion switch is arranged between the power module and the output terminal; The display module includes a voltmeter, a closing indicator light and a timer. The voltmeter is connected in parallel with the output terminal, the closing indicator light is connected with the input terminal, and the timer is connected with the conversion switch.

2. The portable tester for rail potential limiting device according to claim 1, characterized in that: The input terminal is connected to an auxiliary relay in the rail potential limiting device to be measured, and the auxiliary relay acts synchronously when the rail potential limiting device is opened and closed.

3. The portable tester for rail potential limiting device according to claim 2, characterized in that: The portable tester of the rail potential limiting device also includes an intermediate relay, which is also connected to the auxiliary relay. The intermediate relay is connected to the closing indicator light, and the timer is set between the conversion switch and the intermediate relay.

4. The portable tester for rail potential limiting device according to claim 3, characterized in that: The intermediate relay comprises a connected coil and a normally open contact, the coil of the intermediate relay is connected to the power module, the coil of the intermediate relay is connected to the auxiliary relay, and the normally open contact of the intermediate relay is connected to the closing indicator light.

5. The portable tester for rail potential limiting device according to claim 3, characterized in that: The input terminal and the intermediate relay are connected to the normally open contact R33 and the normally closed contact R34 of the auxiliary relay K56 in the rail potential limiting device to be measured.

6. The portable tester for rail potential limiting device according to claim 1, characterized in that: The power module comprises: A power interface, the power interface is connected to an external power source; A power switch connected to the power interface; A voltage conversion module, wherein the voltage conversion module is connected to the power switch; The stepless rotary knob switch is connected to the voltage conversion module, and the stepless rotary knob switch is connected to the conversion switch.

7. The portable tester for rail potential limiting device according to claim 6, characterized in that: The portable tester for the rail potential limiting device also includes a housing having a first side and a second side adjacent to each other; The power interface and the power switch are arranged on the first side of the shell, the voltage conversion module is arranged inside the shell, and the input terminal, the output terminal, the stepless knob switch, the conversion switch, and the display module are all arranged on the second side of the shell.

8. The portable tester for rail potential limiting device according to claim 7, characterized in that: The shell is made of ABS plastic.

9. The portable tester for rail potential limiting device according to claim 1, characterized in that: The portable tester weighs less than 1 kg.

10. The portable tester for rail potential limiting device according to claim 1, characterized in that: The output terminal and the input terminal are connected to the potential limiting device of the rail to be tested through clamp-type wiring terminals.

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