CN203894379U - Comprehensive test stand for detecting performances of mine low-voltage feeder switch - Google Patents

Abstract

The utility model discloses a comprehensive test bench for detecting the performance of a mine-used low-voltage feed switch, which includes a voltage device, a current device, a resistance device, a panel button and an electric stopwatch; the voltage device includes a plug-in voltage regulator and a test voltage generating device , wherein, the voltage regulating circuit of the plug-in voltage regulator is independent; one end of the plug-in voltage regulator is connected to the panel button, and the other end is provided with a plug-in voltage output line connected to the mine low-voltage feed switch. The mine low-voltage feed switch is used for detection, and the electric stopwatch is directly connected to the mine low-voltage feed switch through the intermediate relay to ensure the accuracy of the measured switch action value. In addition, the utility model can complete the detection of protection performance parameters such as overvoltage, undervoltage, overload, short circuit, phase failure and leakage of mine low-voltage feeder switch, with accurate data and stable performance, which saves the inspection and maintenance of coal mine maintenance personnel to the greatest extent. time, reduce the labor intensity of maintenance personnel, and improve maintenance efficiency.

Description

A comprehensive test bench for detecting the performance of mine low-voltage feeder switch

technical field

The utility model relates to a comprehensive test bench for detecting the performance of a mine-used low-voltage feed switch. the

Background technique

Coal mine safety has always been a matter of close concern to the state. In recent years, the state has continuously put forward higher safety and efficient production requirements for coal mining enterprises, and coal mining enterprises' awareness of safety production is also increasing. Coal mine underground power supply system plays an important role in coal mine safety production. Mine-used low-voltage feeder switch is a key link in coal mine power distribution system, and its performance directly affects the safety and production efficiency of coal mine underground. Therefore, it is of great significance to ensure the normal operation of underground electromechanical equipment to quickly and accurately analyze and deal with switch faults. the

Explosion-proof switches are mainly used in various places that require safe explosion-proof and reliable breaking, especially in the machinery and equipment of the manufacturing plant and the power supply of the system where explosive and flammable gases may exist. The underground environment of my country's coal mines is harsh, and there are a lot of flammable and explosive gases such as gas and carbon monoxide and coal dust around. Therefore, explosion-proof switches are often used underground in coal mines. Load is also the type of electrical equipment that is used the most and has the most failures in the mine site. According to the on-site investigation of low-voltage feeder switches, in coal mine production, low-voltage integrated protectors often fail to work normally, abnormal displays, power supply modules are damaged, trips without faults, trips with false faults, and failure to transmit power normally. In long-term operation, there may also be abnormal protection performance such as overvoltage, undervoltage, overload, short circuit, phase failure, and leakage. However, for the fault detection of low-voltage feeder switches used in mines, at present, most of the instruments and tools used in the on-site mechanical and electrical maintenance workshops of coal mines are not targeted. Carry out maintenance based on experience or return it directly to the manufacturer. the

In addition, at present, domestic high-voltage and low-voltage switchgear products are showing a trend of diversification and diversification. In the case of product diversification and diversification, many manufacturers have developed relevant testing instrument platforms based on their own mine-used low-voltage feeder switches. However, different manufacturers and different models of mine low-voltage feeder switches inevitably have different configurations, which makes this testing equipment incompatible with various types of mine low-voltage feeder switches for detection. With the improvement of science and technology, the types of mine low-voltage feeder switches are increasing day by day, and more and more types of explosion-proof switches purchased by coal mine enterprises will also be increasingly diverse, and the incompatibility of testing equipment will greatly increase the cost of testing. According to the research on the use types of mine low-voltage feeder switches at the coal mine site, the types of mine-used low-voltage feeder switches can be divided into two categories: one type of plug-in switch needs external power supply, and the other type of switch plug-in is powered by its own switch. the

Utility model content

Aiming at the above-mentioned defects in the performance detection equipment of mine low-voltage feed switch in the prior art, the utility model proposes a comprehensive test bench for detecting the performance of mine low-voltage feed switch, which has good compatibility and can test multiple A type of mine low-voltage feeder switch. the

In order to achieve the above object, the utility model adopts the following technical solutions:

A comprehensive test bench for detecting the performance of mine-used low-voltage feeder switches, including a voltage device, a current device, a resistance device, a panel button and an electric stopwatch; the voltage device includes a plug-in voltage regulator and a test voltage generating device, wherein the plug-in regulator The voltage regulating circuit of the voltage regulator is independent; one end of the plug-in voltage regulator is connected to the panel button, and the other end is provided with a plug-in voltage output line connected to the mine low-voltage feed switch, and a plug-in voltmeter is provided on the plug-in voltage output line; the test voltage The generating device includes a test voltage regulator and a three-phase transformer. The three-phase transformer is located behind the test voltage regulator. One end of the test voltage regulator is connected to the panel button, and the other end is connected to the three-phase transformer. The test voltage output line connected to the mine-used low-voltage feeder switch is provided with a test voltmeter on the test voltage output line. the

Further, the current device includes a current voltage regulator and a current generator. The current generator is arranged behind the current voltage regulator. One end of the current voltage regulator is connected to the panel button, and the other end is connected to the current generator. There is a test current output line connected to the mine low-voltage feeder switch, and a test ammeter is provided on the test current output line. the

Further, a step-down transformer is provided in front of the current voltage regulator, one end of the step-down transformer is connected to the panel button, and the other end is connected to the current voltage regulator. the

Further, the resistance device includes a dynamic resistance and a static resistance; one end of the dynamic resistance is connected with the panel button, and the other end is provided with a dynamic resistance output line connected with the mine low-voltage feed switch; one end of the static resistance is connected with the panel button, and the other end is provided with a There is a static resistance output line connected with the mine low-voltage feed switch, and an ohmmeter is arranged on the static resistance output line. the

Further, the electric stopwatch is directly connected to the mine-used low-voltage feed switch through an intermediate relay. the

The utility model has the following beneficial technical effects:

The utility model can quickly and accurately analyze the failure of the low-voltage feed switch, and complete the detection of protection performance parameters such as overvoltage, undervoltage, overload, short circuit, phase failure and leakage of the mine low-voltage feed switch, and can be compatible with the detection Various types of mine-used low-voltage feeder switches save the maintenance time of coal mine maintenance personnel to the greatest extent, reduce the labor intensity of maintenance personnel, and improve maintenance efficiency. The utility model brings great convenience to the on-site detection of the mine-used low-voltage feed switch. the

Description of drawings

Fig. 1 is the system structural diagram of comprehensive test bench in the utility model;

Figure 2 is a sectional view of the comprehensive test bench in Figure 1;

in,

A1-power indicator, A2-plug-in voltage indicator, A3-test voltage indicator, A4-test current indicator, A5-test resistance indicator, A6-1K resistor;

B1-start, B2-insert voltage setting, B3-voltage output, B4-small range current regulation, B5-resistance setting, B6-stopwatch reset;

C1-stop, C2-insert voltage output, C3-voltage stop, C4-current output, C5-resistance output, C6-analog grounding;

D1-emergency stop, D2-insert pressure stop, D3-standby, D4-current stop, D5-resistor disconnection, D6-standby;

E1-power supply voltmeter, E2-test voltmeter, E3-test ammeter, E4-plug-in voltmeter, E5-ohmmeter, E6-electric stopwatch, E7-plug-in voltage regulator, E8-test voltage regulator, E9-three Phase transformer, E10-current generator, E11-current voltage regulator, E12-resistance box. the

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

As shown in Figure 1, the comprehensive test bench used to test the performance of mine-used low-voltage feeder switches includes voltage devices, current devices, resistance devices, panel buttons and electric stopwatches. the

The voltage device includes a plug-in voltage regulator and a test voltage generating device. The voltage regulating circuit of the plug-in voltage regulator is independent, and whether the plug-in power supply is selected according to the type of the switch to be tested; one end of the plug-in voltage regulator is connected to the panel button, and the other end is provided with a The plug-in voltage output line connected to the mine-used low-voltage feeder switch is provided with a plug-in voltmeter V1 on the plug-in voltage output line; the test voltage generating device includes a test voltage regulator and a three-phase transformer, and the three-phase transformer is set at the test voltage regulator. At the rear, one end of the test voltage regulator is connected to the panel button, and the other end is connected to the three-phase transformer. The three-phase transformer is provided with a test voltage output line connected to the mine low-voltage feed switch. Voltmeter V2. the

The current device includes a current voltage regulator and a current generator. The current generator is located behind the current voltage regulator. One end of the current voltage regulator is connected to the panel button, and the other end is connected to the current generator. The test current output line connected to the mine-used low-voltage feeder switch is provided with a test ammeter A on the test current output line. the

Introduce a 220V to 110V step-down transformer in front of the current regulator for selection, and change the current regulation dial to two scale values of 0-1000A and 0-2000A to ensure that the detection of switches with different rated currents is at different current values with sufficient precision. Connect one end of the step-down transformer to the panel button and the other end to the current regulator. the

Resistance devices include dynamic resistance and static resistance. The static resistance is generated by the adjustment of the resistance box, and the 1K dynamic resistance is the simulated human body resistance during the dynamic leakage protection performance test. One end of the dynamic resistor is connected to the panel button, and the other end is provided with a dynamic resistance output line connected to the mine low-voltage feed switch; one end of the static resistor is connected to the panel button, and the other end is provided with a static resistor connected to the mine low-voltage feed switch The output line is provided with an ohmmeter Ω on the static resistance output line. the

The resistance signal acquisition circuit of the static resistance adopts a relay interlocking design to prevent the resistance value of the resistance box from being charged. the

Specifically, the above-mentioned plug-in voltage regulator, test voltage regulator, current voltage regulator, dynamic resistance and static resistance are connected to the panel buttons through the intermediate relay, and are all controlled by the panel buttons, which are used to generate and detect low-voltage power feed for mining Voltage, current and resistance signals required for switching. the

In addition, the output lines of the above-mentioned plug-in voltage regulator, test voltage regulator, current voltage regulator, dynamic resistance and static resistance are all connected to the mine-used low-voltage feeder switch through the switchboard. the

The electric stopwatch is directly connected to the mine low-voltage feed switch through the intermediate relay, which can quickly respond to the closing and opening signals of the mine low-voltage feed switch, and accurately measure the switch opening time. the

System test and detection can be generally divided into three categories: voltage test, current test and leakage test. Among them, the voltage test detection includes the detection of the undervoltage and overvoltage performance of the mine low-voltage feeder switch, the current test detection includes the detection of the short circuit, overload and phase failure performance of the switch, and the leakage test detection includes the leakage lock and dynamic leakage performance of the switch detection. the

Table 1 is the corresponding diagram of the output terminal row at the bottom right of the comprehensive test bench in the utility model:

Table 1

connect device circuit wire number row number Connect to KA15, connect the right port to the low-proof switch shell K015 1 the the 2 the the 3 Connect to 1K resistor, connect the right port to the low-proof switch terminal 1K resistor 4 the the 5 the the 6 the the 7 Connect to the upper terminal block 64, and connect the right port to the shell of the low-proof switch FG 8 V- of KA14, the right port is connected to the remote relay V- 9 KA14 coil, the right port is connected to the remote relay K014 10

Table 2 is the corresponding diagram of the output terminal block below the comprehensive test bench in the utility model:

Table 2

connect device circuit wire number row number Connect to QF1, the lower port connects to the power supply A 1 Connect to QF1, the lower port connects to the power supply B 2 Connect to the lower port of QF1 and connect to the power supply C 3 Connect to QF1, the lower port connects to the power supply N 4 Connect to the output of KM2, and connect the lower port to the input of the test voltage regulator U002 5 Connect to the output of KM2, and connect the lower port to the input of the test voltage regulator V002 6 Connect to the output of KM2, and connect the lower port to the input of the test voltage regulator W002 7 Connect to KM3 output, the lower port connector voltage regulator input U006 8 Connect to KM3 output, the lower port connector voltage regulator input U007 9 Connect to the input of KM4, and the output of the voltage regulator of the lower port connector U008 10 Connect to KM4 input, the lower port connector voltage regulator output U009 11 Connect to KM4 output, power supply output of the lower port connector U010 12 Connect to KM4 output, power supply output of the lower port connector U011 13 Connect to the output of KM5, and connect the lower port to the input of the current generator U014 14 Connect to the output of KM5, and connect the lower port to the input of the current generator U015 15 Connect to the upper terminal block 55, and connect the lower port to the output of the test voltage regulator U003 16 Connect to the upper terminal block 56, and connect the lower port to the output of the test voltage regulator V003 17 Connect to the upper terminal block 57, and connect the lower port to the output of the test voltage regulator W003 18 Connect to KA10 normally open contact, connect the lower port to the external low-proof switch terminal KM014 19 the the 20

The specific detection process of voltage test, current test and leakage test is described below in combination with Table 1, Table 2 and Figure 2:

If the switch plug-in needs external power supply, connect the No. The rated voltage of the switch plug-in is adjusted by the plug-in voltage regulator, and the switch plug-in can be powered by pressing the "plug-in voltage output" button C2; if the switch plug-in can supply power by itself, the above operations are not required. the

Before the start-up of the test bench, terminals No. 9 and No. 10 on the lower right side of the switchboard are connected to a pair of normally open contacts of the control relay of the mine-used low-voltage feed switch through cables; start the power supply and conduct voltage, current and leakage detection tests. the

1. Voltage test detection

Connect the three high-voltage output cables from the three-phase transformer to the three terminals on the input side of the mine-used low-voltage feeder switch, select the overvoltage/undervoltage test to be performed, and refer to the national standard GB8286-2005 According to the relevant regulations on overvoltage/undervoltage of electric switches, calculate the standard value of overvoltage/undervoltage under the corresponding voltage level. Press the "voltage output" button B3 of the test bench to adjust the test voltage regulator according to the standard value. Press the test bench "voltage stop" button C3 and "stopwatch reset" button B6 in turn to stop the adjustment. Press the "voltage output" button B3 again to conduct a voltage detection test. After the switch performs the corresponding action, compare the switch opening time measured by the electric stopwatch with the standard action value to judge the overvoltage/undervoltage protection performance of the switch. After the test is completed, return the test voltage regulator to zero, and press the "voltage stop" button C3 and the "stopwatch reset" button B6 on the test bench in turn to end the voltage test operation. After the discharge of the three-phase transformer is completed, remove the three high-voltage output cables from the three-phase transformer from the three terminals on the input side of the mine-used low-voltage feed switch. In addition, in the voltage test and detection, all types of switches do not need to be plugged in for power supply. the

2. Current test detection

In the short-circuit/overload test, the cables from the current generator are wrapped around the three current transformers on the low-voltage side of the mine-used low-voltage feed switch, and the two cables at the far end are short-circuited; On the corresponding two current transformers on the low-voltage side of the low-voltage feed switch, the two cables at the far end are short-circuited. Determine whether the switch plug-in needs external power supply according to the selected switch model. Refer to the GB8286-2005 national standard on the short-circuit/overload performance of low-voltage feeder switches, calculate the reference current value of the short-circuit/overload test according to the rated current value of the switch, and select the appropriate current regulation range according to the reference current value, and the default value of the test bench is 0 ~2000A current regulation range, click the "small range current regulation" button B4 to select the range of 0 ~ 1000A, so that the current regulation is more accurate. Press the "current output" button C4 to adjust the current generator according to the reference current value, press the test bench "current stop" button D4 and "stopwatch reset" button B6 in turn to stop the adjustment. Press the "Current Output" button C4 again to carry out related tests. After the switch performs corresponding actions, compare the switch opening time measured by the electric stopwatch with the standard action value to judge the short circuit/overload/phase failure protection performance of the switch. After the test is completed, return the current generator to zero, press the "current stop" button D4, and remove the test circuit after the discharge of the current generator is completed. the

3. Leakage test detection

Determine whether the switch plug-in needs external power supply according to the selected switch model. the

(1) During the static leakage, connect the No. 12 and No. 13 power lines of the terminal block below the switchboard to the plug-in power supply of the mine low-voltage feed switch, and connect the No. 19 line of terminal blocks under the switchboard to the input of the mine low-voltage feed switch through cables. Connect any one of the three terminals on the line side, and connect terminal block No. 8 on the lower right side of the switchboard to the shell of the mine low-voltage feed switch (the ground wire of the mine low-voltage feed switch) through a cable. During the leakage lockout test, press the "resistance setting" button B5, and adjust the resistance box according to the standard action value of the leakage lockout of the mine low-voltage feeder switch stipulated in the national standard; press the "resistance output" button C5 to test, and check the mine Check whether the low-voltage feeder switch has the word "lockout", and after the switch performs the corresponding action, compare the switch opening time measured by the electric stopwatch with the standard action value to judge the static leakage protection performance of the switch. After the test is completed, press the "Resistor Disconnect" button D5 and the "Stopwatch Reset" button B6 to end the leakage lockout test. After a period of time, connect the No. cable removed. the

(2) Dynamic leakage Connect the three high-voltage output cables from the three-phase transformer to the three terminals on the input side of the mine low-voltage feeder switch; On any one of the three terminals on the input side of the feed switch, the terminal block No. 1 on the lower right side of the switchboard is connected to the shell of the mine low-voltage feed switch (the ground wire of the mine low-voltage feed switch) through a cable, press Press the "1K resistance" button A6 to conduct a dynamic leakage test; after the switch performs the corresponding action, compare the switch opening time measured by the electric stopwatch with the standard action value to judge the dynamic leakage protection performance of the switch, and press the "stopwatch reset" Press button B6 to end the dynamic leakage test. After the test is completed, remove the test circuit. the

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that any person skilled in the art can make all Equivalent substitutions or obvious deformation forms all fall within the essential scope of this specification and should be protected by the utility model. the

Claims (5)

1. A comprehensive test bench for detecting the performance of mine low-voltage feeder switches, including voltage devices, current devices, resistance devices, panel buttons and electric stopwatches; it is characterized in that the voltage devices include plug-in voltage regulators and test voltage generators The device, wherein the voltage regulating circuit of the plug-in voltage regulator is independent; one end of the plug-in voltage regulator is connected to the panel button, and the other end is provided with a plug-in voltage output line connected to the mine low-voltage feed switch, and the plug-in voltage output line is provided with Plug-in voltmeter; the test voltage generating device includes a test voltage regulator and a three-phase transformer. The three-phase transformer is located behind the test voltage regulator. The phase transformer is provided with a test voltage output line connected to the mine-used low-voltage feed switch, and a test voltmeter is provided on the test voltage output line. 2. A kind of comprehensive test bench for detecting mine-used low-voltage feeder switch performance according to claim 1, it is characterized in that the current device comprises a current regulator and a current generator, and the current generator is located at the current regulator One end of the current regulator is connected to the panel button, and the other end is connected to the current generator. The current generator is equipped with a test current output line connected to the mine low-voltage feed switch. Set the test current output line on the test current output line. There is a test ammeter. 3. A kind of comprehensive test bench for detecting mine-used low-voltage feeder switch performance according to claim 2, it is characterized in that, the front of current voltage regulator is provided with step-down transformer, and one end of step-down transformer is connected to panel The other end is connected to the current regulator. 4. A kind of comprehensive test bench for detecting mine low-voltage feeder switch performance according to claim 1, it is characterized in that, resistance device comprises dynamic resistance and static resistance; One end of dynamic resistance is connected with panel button, and the other end There is a dynamic resistance output line connected to the mine low-voltage feed switch; one end of the static resistance is connected to the panel button, and the other end is provided with a static resistance output line connected to the mine low-voltage feed switch. There is an ohmmeter. 5. A kind of comprehensive test bench for detecting the performance of the mine low-voltage feed switch according to claim 1, wherein the electric stopwatch is directly connected to the mine low-voltage feed switch through an intermediate relay.