Drawer loop test system

Abstract

The utility model relates to a drawer loop test system, which comprises a primary loop and a secondary loop, and is characterized in that the drawer loop test system comprises a primary loop control unit which is connected with the primary loop in a pluggable manner and is used for controlling the action of the primary loop; the secondary loop control unit is connected with the secondary loop in a pluggable manner and is used for controlling the action of the secondary loop; and the controller is electrically connected with the primary loop control unit and the secondary loop control unit and is used for sending control signals to the primary loop control unit and the secondary loop control unit. The device has the advantages that the primary loop control unit connected with the primary loop in a pluggable manner and the secondary loop control unit connected with the secondary loop in a pluggable manner are arranged, so that manual wiring is not needed, and the test dismounting efficiency is improved; moreover, control signals can be sent to the primary loop control unit and the secondary loop control unit through the controller, thereby facilitating the test of the drawer loop, improving the test efficiency, and reducing the labor cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to test system technical field especially relates to a drawer circuit test system. BACKGROUND

[0002] In the low voltage distribution cabinet, its low voltage distribution circuit is roughly divided into fixed circuit and drawer circuit two, wherein the drawer circuit quantity is most, and the drawer circuit is generally configured with microcomputer protection relay, according to test regulation, regularly needs to carry out relay protection test to drawer circuit.

[0003] The current test method is to pull out the drawer, and carries out relay protection test to the drawer circuit offline, according to test project (test project has several, generally 5~8 items) first wiring, then uses test instrument to debug, again removes test wiring, sequentially completes all test projects, but the existing test method has great wiring workload, and test time is long, and much manual is consumed, and the working efficiency is low. For this, the prior art needs further improvement. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that the utility model wants to solve is in view of the prior art, provide a kind of drawer circuit test system that can improve test efficiency.

[0005] The technical scheme that the utility model solves above-mentioned technical problem adopts: a kind of drawer circuit test system, and the drawer circuit includes primary circuit and secondary circuit, and it is characterized in that the drawer circuit test system includes:

[0006] Primary circuit control unit, with the primary circuit plug-in connection described above, for controlling the primary circuit action;

[0007] Secondary circuit control unit, with the secondary circuit plug-in connection described above, for controlling the secondary circuit action;

[0008] Controller, with the primary circuit control unit and secondary circuit control unit electric connection, for sending control signal to primary circuit control unit and secondary circuit control unit.

[0009] In order to realize the phase test of primary circuit, the controller is further electrically connected with current analog signal output unit, and the primary circuit control unit includes three relays, is first relay, second relay and third relay respectively, each relay includes coil and the double contact of action after coil energization, the coil of three relays is connected with power supply through corresponding first switch, and the double contact of three relays is connected on the phase of three-phase electricity of primary circuit respectively at one end of current analog signal output unit, and the double contact of three relays is connected on the phase of three-phase electricity of primary circuit respectively at the other end, and each first switch is electrically connected with the controller.

[0010] In order to realize the phase polarity test of the primary circuit, the primary circuit control unit further comprises a fourth relay, a fifth relay, a sixth relay and a ninth relay, each of which comprises a coil and double contacts which act after the coil is energized, the coils of the fourth relay, the fifth relay, the sixth relay and the ninth relay are connected with the power supply through corresponding second switches, the two contacts at one end of the double contacts of the fourth relay are connected, the two contacts at the other end of the double contacts of the fourth relay are connected with the second contact in the other end of the double contacts of the second relay and the second contact in the other end of the double contacts of the third relay respectively, the double contacts at one end of the fifth relay and the sixth relay are connected on the current analog signal output unit, the two contacts at the other end of the double contacts of the fifth relay are connected with the first contact in the other end of the double contacts of the second relay and the first contact in the other end of the double contacts of the first relay respectively, the two contacts at the other end of the double contacts of the sixth relay are connected with the first contact in the other end of the double contacts of the third relay and the first contact in the other end of the double contacts of the second relay respectively, the two contacts at one end of the double contacts of the ninth relay are connected, the two contacts at the other end of the double contacts of the ninth relay are connected with the second contact in the other end of the double contacts of the first relay and the second contact in the other end of the double contacts of the second relay respectively, and each second switch is electrically connected with the controller.

[0011] In order to realize the current analog quantity test of the primary circuit, the primary circuit control unit further comprises a seventh relay and an eighth relay, each of which comprises a coil and double contacts which act after the coil is energized, the coils of the seventh relay and the eighth relay are connected with the power supply through corresponding third switches, the double contacts at one end of the seventh relay are connected on the current analog signal output unit, the two contacts at the other end of the double contacts of the seventh relay are connected with the first contact in the other end of the double contacts of the first relay and the second contact in the other end of the double contacts of the third relay respectively, the two contacts at one end of the double contacts of the eighth relay are connected with the first contact in the other end of the double contacts of the second relay and the first contact in the other end of the double contacts of the third relay respectively, the two contacts at the other end of the double contacts of the eighth relay are connected, and each third switch is electrically connected with the controller.

[0012] Preferably, the controller is further electrically connected with a touch screen capable of human-computer interaction.

[0013] Preferably, the secondary circuit control unit comprises a control switch electrically connected with the controller, the secondary circuit comprises a contactor, the contactor has a coil and three contacts which act after the coil is energized, one end of the control switch is connected with the power supply, the other end of the control switch is electrically connected with the coil of the contactor, and the three contacts of the contactor are arranged on each phase of the three-phase power supply.

[0014] Preferably, the drawer circuit further comprises a protection unit arranged in the secondary circuit, and the controller is further electrically connected with the protection unit to control the protection unit to act.

[0015] In order to reduce the disconnection work, a first connector terminal for the primary circuit and a second connector terminal for the secondary circuit are further arranged, the first connector terminal is further electrically connected with the primary circuit control unit, and the second connector terminal is electrically connected with the secondary circuit control unit.

[0016] Preferably, the test system comprises a shell with an opening, an inner cavity for placing the drawer circuit through the opening is arranged in the shell, and the first connector terminal and the second connector terminal are arranged in the shell and partially exposed in the inner cavity.

[0017] Compared with the prior art, the test system has the following advantages: on the one hand, the primary circuit control unit connected with the primary circuit in a plug-in manner and the secondary circuit control unit connected with the secondary circuit in a plug-in manner are arranged, so that manual wiring is not needed, and the test disassembly efficiency is improved; on the other hand, the controller is electrically connected with the primary circuit control unit and the secondary circuit control unit, so that the controller can send control signals to the primary circuit control unit and the secondary circuit control unit, and the test on the drawer circuit is facilitated, the test efficiency is improved, and the labor cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A control block diagram of the drawer circuit test system in the embodiment of the utility model;

[0019] Figure 2 A specific circuit diagram of Figure 1 ;

[0020] Figure 3 An enlarged view of A in Figure 2 ;

[0021] Figure 4 A principle block diagram of the drawer circuit test system in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be described in further detail below with reference to the embodiment of the drawings.

[0023] The drawer circuit in the embodiment includes a primary circuit 1 and a secondary circuit 2. The specific circuits of the primary circuit 1 and the secondary circuit 2 are as shown in Figure 2 The drawer circuit in the embodiment can refer to the disclosure in https: / / www.zhihu.com / question / 614542478 / answer / 3140186333, and details are not described here.

[0024] As shown in Figure 1 and Figure 2 The drawer circuit test system in the embodiment includes a primary circuit control unit 3, a secondary circuit control unit 4, a controller 5, and a touch screen 7 capable of human-computer interaction. The primary circuit control unit 3 is plug-in connected with the primary circuit 1 and is used to control the action of the primary circuit 1. The secondary circuit control unit 4 is plug-in connected with the secondary circuit 2 and is used to control the action of the secondary circuit 2. The controller 5 is electrically connected with the primary circuit control unit 3 and the secondary circuit control unit 4 and is used to send control signals to the primary circuit control unit 3 and the secondary circuit control unit 4. The controller 5 is also electrically connected with the touch screen 7.

[0025] Specifically, the test system includes a first connector terminal (not shown in the figure) for the primary circuit 1 and a second connector terminal (not shown in the figure) for the secondary circuit 2. The first connector terminal is also electrically connected with the primary circuit control unit 3, and the second connector terminal is electrically connected with the secondary circuit control unit 4. The first connector terminal and the second connector terminal in the embodiment both adopt conventional connector terminals in the prior art, and details are not described here. In addition, the test system includes a shell with an opening (not shown in the figure). An inner cavity for placing the drawer circuit through the opening is formed in the shell. The first connector terminal and the second connector terminal are arranged in the shell and partially exposed in the inner cavity.

[0026] The controller 5 in the embodiment is also electrically connected with a current analog signal output unit 6. The primary circuit control unit 3 includes nine relays, i.e., a first relay KM1, a second relay KM2, a third relay KM3, a fourth relay KM4, a fifth relay KM5, a sixth relay KM6, a seventh relay KM7, an eighth relay KM8, and a ninth relay KM9. Each relay includes a coil and double contacts that act after the coil is powered on.

[0027] As shown in Figure 3As shown, the coils of the first relay KM1, the second relay KM2 and the third relay KM3 are all connected to the power supply through the corresponding first switches. One end of the double contacts of the first relay KM1, the second relay KM2 and the third relay KM3 is connected to the current simulation signal output unit 6. The other ends of the double contacts of the first relay KM1, the second relay KM2 and the third relay KM3 are respectively connected to each phase of the three-phase power of the primary circuit 1. Each first switch is electrically connected to the controller 5. Figure 2 As shown, the first switches connected to the coil of the first relay KM1 , the coil of the second relay KM2 , and the coil of the third relay KM3 are K1 , K2 , and K3 , respectively.

[0028] like Figure 3 As shown, in addition, the coils of the fourth relay KM4, the fifth relay KM5, the sixth relay KM6 and the ninth relay KM9 are all connected to the power supply through the corresponding second switch, the two contacts at one end of the double contact of the fourth relay KM4 are connected, and the two contacts at the other end of the double contact of the fourth relay KM4 are respectively connected to the second contact at the other end of the double contact of the second relay KM2 and the second contact at the other end of the double contact of the third relay KM3, one end of the double contact of the fifth relay KM5 and the sixth relay KM6 are both connected to the current simulation signal output unit 6, and the two contacts at the other end of the double contact of the fifth relay KM5 are respectively connected to the second contact at the other end of the double contact of the second relay KM2. The first contact of the other end of the double contact of the relay KM2 is connected to the first contact of the other end of the double contact of the first relay KM1, the two contacts of the other end of the double contact of the sixth relay KM6 are respectively connected to the first contact of the other end of the double contact of the third relay KM3 and the first contact of the other end of the double contact of the second relay KM2, the two contacts of one end of the double contact of the ninth relay KM9 are connected, the two contacts of the other end of the double contact of the ninth relay KM9 are respectively connected to the second contact of the other end of the double contact of the first relay KM1 and the second contact of the other end of the double contact of the second relay KM2, and each second switch is electrically connected to the controller 5. Figure 2 As shown, the second switches connected to the coil of the fourth relay KM4, the coil of the fifth relay KM5, the coil of the sixth relay KM6 and the coil of the ninth relay KM9 are K4, K5, K6 and K9 respectively.

[0029] like Figure 3As shown, the coils of the seventh relay KM7 and the eighth relay KM8 are connected to the power supply through corresponding third switches, one end of the double contacts of the seventh relay KM7 is connected to the current analog signal output unit 6, the other end of the double contacts of the seventh relay KM7 is connected to the first contact in the other end of the double contacts of the first relay KM1 and the second contact in the other end of the double contacts of the third relay KM3, the two contacts of the other end of the double contacts of the eighth relay KM8 are connected to the first contact in the other end of the double contacts of the second relay KM2 and the first contact in the other end of the double contacts of the third relay KM3, the two contacts of the other end of the double contacts of the eighth relay KM8 are connected, and each third switch is electrically connected to the controller 5. Figure 2 As shown, the third switches connected to the coils of the seventh relay KM7 and the eighth relay KM8 are K7 and K8 respectively.

[0030] The secondary circuit control unit 4 includes a control switch KA electrically connected to the controller 5, the secondary circuit 2 includes a contactor KM having a coil and three contacts that act after the coil is energized, one end of the control switch KA is connected to the power supply, the other end of the control switch KA is electrically connected to the coil of the contactor KM, and the three contacts of the contactor KM are arranged on each phase of the three-phase power of the primary circuit 1. Figure 2 As shown, the control switch KA in the embodiment is connected in series between the port 105 and the port 119 in the secondary circuit 2, since the coil of the contactor KM is also connected in series on the line where the port 105 and the port 119 of the secondary circuit 2 are located, the controller 5 can adjust the opening and closing of the control switch KA, and the coil of the contactor KM can be energized after the control switch KA is closed, thereby closing the contacts of the contactor KM located on the primary circuit 1.

[0031] The drawer circuit also includes a protection unit (the protection unit can be set as needed, such as overvoltage, undervoltage protection, and / or overcurrent protection, and / or ground protection) located in the secondary circuit 2, and the controller 5 is also electrically connected to the protection unit for controlling the action of the protection unit. Figure 4 As shown, the controller 5 of the drawer circuit test system in the embodiment uses a high-level DSP in an embedded computer, and the embedded computer is operated through a liquid crystal operation interface, Figure 4 The single-phase current amplification in Figure 2 The current analog signal output unit 6 in Figure 4 The intelligent isolation in Figure 2 The switches K1, K2, K3, K4, K5, K6, K7, K8, and K9 in Figure 4 The high-precision D / A in Figure 4the output acquisition system in the current analog signal output unit 6, and Figure 2 the acquisition system for comparing the actual output with the theoretical output of the switches K1, K2, K3, K4, K5, K6, K7, K8 and K9, to verify the output results of the current analog signal output unit 6 and the switches K1, K2, K3, K4, K5, K6, K7, K8 and K9.

[0032] The drawer circuit test system in the embodiment can perform the following eight tests:

[0033] Test 1, phase comparison test

[0034] Test method: push the drawer circuit to be tested into the inner cavity of the shell through the opening, make the primary circuit 1 of the drawer circuit to be tested inserted with the first connector terminal, make the secondary circuit 2 of the drawer circuit to be tested inserted with the second connector terminal, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested.

[0035] Step 1: close the 220V power switch, so that the secondary circuit of the drawer circuit to be tested is powered;

[0036] Step 2: press the contactor closing button of the touch screen 7 of the man-machine interaction, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0037] Step 3:

[0038] Compare phase A, select phase comparison on the man-machine operation interface, select to apply 20% CT rated current, press the test button, the controller triggers K3 in the primary circuit control unit to close, makes the third relay KM3 attracted, after the attraction, the controller slowly applies A-phase current according to the set current multiple, checks whether the current displayed on the comprehensive protector display of the drawer circuit is A-phase current; the comprehensive protector of the above drawer circuit is the prior art known to those skilled in the art, and will not be expanded here.

[0039] Compare phase B, select phase comparison on the man-machine operation interface, select to apply 20% CT rated current, press the test button, the controller triggers K2 in the primary circuit control unit to close, makes the second relay KM2 attracted, after the attraction, the controller slowly applies B-phase current according to the set current multiple, checks whether the current displayed on the comprehensive protector display of the drawer circuit is B-phase current.

[0040] Check C phase, select phase check in the man-machine interface, select 20% CT rated current, press the test button, the controller triggers K1 in the primary circuit control unit to close, makes the first relay KM1 attract, and the controller slowly applies C phase current according to the set current multiple after the attraction, checks whether the current displayed by the comprehensive protector of the drawer circuit is C phase current.

[0041] Test 2, polarity test

[0042] Test method: similarly, push the drawer circuit to be tested into the inner cavity of the shell, make the primary circuit 1 of the drawer circuit to be tested and the first connector terminal be connected, make the secondary circuit 2 of the drawer circuit to be tested and the second connector terminal be connected, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested;

[0043] Step 1: turn on the 220V power supply, and make the secondary circuit of the drawer circuit to be tested get electricity;

[0044] Step 2: press the contactor closing button of the man-machine interface, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0045] Step 3:

[0046] Check AB phase, select polarity test in the man-machine interface, select 20% CT rated current, press the test button, the controller triggers K5 and K9 in the primary circuit control unit to close, makes the fifth relay KM5 and the ninth relay KM9 attract, and the controller slowly applies A and B phase current according to the set current multiple after the attraction, checks whether the current displayed by the comprehensive protector of the drawer circuit is 0, if not, check whether the comprehensive protector wiring is correct;

[0047] Check BC phase, select polarity test in the man-machine interface, select 20% CT rated current, press the test button, the controller triggers K6 and K4 in the primary circuit control unit to close, makes the sixth relay KM6 and the fourth relay KM4 attract, and the controller slowly applies B and C phase current according to the set current multiple after the attraction, checks whether the current displayed by the comprehensive protector of the drawer circuit is 0, if not, check whether the comprehensive protector wiring is correct.

[0048] Test 3, analog quantity test

[0049] Test method: similarly, push the drawer circuit to be tested into the inner cavity of the shell, make the primary circuit 1 of the drawer circuit to be tested and the first connector terminal be connected, make the secondary circuit 2 of the drawer circuit to be tested and the second connector terminal be connected, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested;

[0050] Step 1: Turn on the 220V power switch to make the secondary circuit of the drawer circuit under test get electricity;

[0051] Step 2: Press the contactor closing button on the human-computer interface, and the controller triggers the control switch KA in the secondary circuit control unit to close, thereby attracting the contactor KM in the secondary circuit;

[0052] Step 3:

[0053] Select the analog quantity test on the human-computer interface, select 20%, 40%, 60%, 80%, and 100% of the CT rated current respectively, press the test button, the controller triggers K7, K8, and K9 in the primary circuit control unit to close, thereby attracting the seventh relay KM7, the eighth relay KM8, and the ninth relay KM9. After attraction, the controller slowly applies the A-phase, B-phase, and C-phase currents according to the set current multiple, and checks whether the A-phase, B-phase, and C-phase currents displayed on the display of the comprehensive protector of the drawer circuit are consistent with the applied current values.

[0054] Test 4, thermal overload protection test

[0055] Thermal overload protection can prevent the motor from being damaged due to thermal overload. When the thermal overload protection is put into alarm / trip (All), the thermal overload function starts and calculates the thermal accumulation. When the thermal accumulation reaches the thermal overload pre-warning temperature limit / start value, an alarm signal / trip command is issued, and the protection action is on the contact;

[0056] Test method: Similarly, push the drawer circuit under test into the inner cavity of the shell, make the primary circuit 1 of the drawer circuit under test inserted with the first connector terminal, make the secondary circuit 2 of the drawer circuit under test inserted with the second connector terminal, and then turn on the circuit breaker QF in the primary circuit of the drawer circuit under test;

[0057] Step 1: Turn on the 220V power switch to make the secondary circuit of the drawer circuit under test get electricity;

[0058] Step 2: Press the contactor closing button on the human-computer interface, and the controller triggers the control switch KA in the secondary circuit control unit to close, thereby attracting the contactor KM in the secondary circuit;

[0059] Step 3: Select the thermal overload protection on the human-machine interface, select the current multiple to be applied, press the test button, the controller triggers K7, K8 and K9 in the primary circuit control unit to close, so that the seventh relay KM7, the eighth relay KM8 and the ninth relay KM9 are attracted, after being attracted, the controller slowly applies the current at the set current multiple, and uses the on-off input to monitor the output contact R1 of the comprehensive protector of the drawer circuit, which is mainly used for the protection control output in the drawer circuit, the output contact R1 is closed to stop the current output after the protection action, and the action current value and the action time of the test are displayed on the touch screen;

[0060] Step 4: Manually reset the output contact R1 of the comprehensive protector of the drawer circuit.

[0061] Test 5, locked-rotor protection test

[0062] Locked-rotor protection is to prevent the motor from burning out due to sudden current rise caused by rotor jamming during operation, and the locked-rotor protection is only put into operation after the motor starts. When the locked-rotor protection is put into alarm / trip, the locked-rotor protection alarm function is started when the motor operating current reaches or exceeds the “locked-rotor protection alarm value”, and immediately acts on the contact, at which time the human-machine interface displays the alarm information, and when the motor operating current reaches or exceeds the “locked-rotor protection trip value”, the locked-rotor protection trip function is started, and a trip command is issued when the set delay time ends, and acts on the contact, at which time the human-machine interface displays the alarm information;

[0063] Test method: Similarly, push the drawer circuit to be tested into the inner cavity of the shell, make the primary circuit 1 of the drawer circuit to be tested inserted with the first connector terminal, make the secondary circuit 2 of the drawer circuit to be tested inserted with the second connector terminal, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested;

[0064] Step 1: Turn on the 220V power supply, so that the secondary circuit of the drawer circuit to be tested is powered;

[0065] Step 2: Press the contactor closing button on the human-machine interface, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0066] Step 3: Select the locked-rotor protection on the human-machine interface, select the current multiple to be applied, press the test button, the controller triggers K7, K8 and K9 in the primary circuit control unit to close, so that the seventh relay KM7, the eighth relay KM8 and the ninth relay KM9 are attracted, after being attracted, the controller slowly applies the current at the set current multiple, and uses the on-off input to monitor the output contact R1 of the comprehensive protector of the drawer circuit, which is mainly used for the protection control output in the drawer circuit, the output contact R1 is closed to stop the current output after the protection action, and the action current value and the action time of the test are displayed on the touch screen;

[0067] Step 4: Manually reset the output contact R1 of the comprehensive protector of the drawer circuit.

[0068] Test 6, Time-out protection test

[0069] The time-out protection is to prevent the motor from being damaged due to overheating caused by the starting time exceeding the normal starting time, and it can also master and eliminate the abnormal changes of the load starting conditions. The starting time-out protection can be selected to trip or alarm, and each contact is respectively operated, at which time the man-machine operation interface displays the alarm information.

[0070] Test method: The drawer circuit to be tested is also pushed into the inner cavity of the shell, the primary circuit 1 of the drawer circuit to be tested is inserted with the first plug-in terminal, the secondary circuit 2 of the drawer circuit to be tested is inserted with the second plug-in terminal, and then the circuit breaker QF in the primary circuit of the drawer circuit to be tested is closed;

[0071] Step 1: Turn on the 220V power supply switch, so that the secondary circuit of the drawer circuit to be tested is powered on;

[0072] Step 2: Press the contactor closing button of the man-machine operation interface, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0073] Step 3: Select the time-out protection on the man-machine operation interface, select the applied current multiple, press the test button, the controller triggers K7, K8 and K9 in the primary circuit control unit to close, the seventh relay KM7, the eighth relay KM8 and the ninth relay KM9 are attracted, after being attracted, the controller slowly increases the current at the set current multiple, and uses the switch quantity input to monitor the output contact R1 of the comprehensive protector of the drawer circuit, the output contact R1 is closed after the protection action, the current output is stopped, and the action current value and the action time of the test are displayed on the touch screen;

[0074] Step 4: Manually reset the output contact R1 of the comprehensive protector of the drawer circuit.

[0075] Test 7, Single-phase ground protection test

[0076] Single-phase grounding protection is a method of judging based on zero sequence filter principle by calculating zero sequence current through detecting vector sum of three-phase current of motor. Single-phase grounding protection can be selected during motor starting process, and the latching time set during motor starting is detected when motor starts, and zero sequence current is detected after the protection latching time. When single-phase grounding protection is put into alarm / trip, single-phase grounding protection alarm function is started when zero sequence current reaches or exceeds "single-phase grounding protection alarm value", and immediately acts on contact point, at which time the man-machine operation interface displays alarm information; when single-phase grounding protection trip function is started when zero sequence current reaches or exceeds "single-phase grounding protection trip value", and the trip command is sent at the end of the set delay, and acts on the contact point, at which time the man-machine operation interface displays alarm information.

[0077] Test method: similarly, push the drawer circuit to be tested into the inner cavity of the shell, make the primary circuit 1 in the drawer circuit to be tested and the first connector terminal be connected, make the secondary circuit 2 in the drawer circuit to be tested and the second connector terminal be connected, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested;

[0078] Step 1: close the 220V power switch, so that the secondary circuit of the drawer circuit to be tested is powered;

[0079] Step 2: press the contactor closing button of the man-machine operation interface, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0080] Step 3: select single-phase grounding protection on the man-machine operation interface, select the applied current multiple, press the test button, the controller triggers K7, K8 and K9 in the primary circuit control unit to close, so that the seventh relay KM7, the eighth relay KM8 and the ninth relay KM9 are attracted, after being attracted, the controller slowly applies 1 times current or suddenly applies 2 times current according to the set current multiple, and uses switch quantity input to monitor the output contact R5 of the comprehensive protector of the drawer circuit, the output contact R5 is mainly used for alarm signal output of the drawer circuit, the output contact R5 is closed after protection action, and the current output is stopped, and the action current value and action time of the test are displayed on the touch screen;

[0081] Step 4: manually reset the output contact R5 of the comprehensive protector of the drawer circuit.

[0082] Test 8, TE protection test

[0083] TE protection is suitable for continuous operation state, including easy start and infrequent start, without obvious additional temperature rise, allowing the use of inverse time overload protection device of increased safety type explosion-proof motor, TE protection is only put into operation after the completion of the motor start. When the TE protection alarm / trip is put into operation, the thermal overload function starts and calculates the trip time limit, when the calculated time limit reaches the action value of the protection, an alarm signal is sent, and the action point is operated, at this time the man-machine operation interface displays the alarm information. When the calculated time limit continues to reach the action value of the protection, a trip command is sent, and the action point is operated, at this time the man-machine operation interface displays the alarm information.

[0084] Test method: the same as above, push the drawer circuit to be tested into the inner cavity of the shell, connect the primary circuit 1 of the drawer circuit to be tested with the first connector terminal, connect the secondary circuit 2 of the drawer circuit to be tested with the second connector terminal, and then close the circuit breaker QF in the primary circuit of the drawer circuit to be tested;

[0085] Step 1: manually turn off the thermal overload and locked-rotor protection of the comprehensive protector of the drawer circuit before testing;

[0086] Step 2: turn on the 220V power switch to make the secondary circuit of the drawer circuit to be tested get power;

[0087] Step 3: press the contactor closing button of the man-machine operation interface, the controller triggers the control switch KA in the secondary circuit control unit to close, and the contactor KM in the secondary circuit is attracted;

[0088] Step 4: select TE protection on the man-machine operation interface, select the applied current multiple, press the test button, the controller triggers K7, K8 and K9 in the primary circuit control unit to close, the seventh relay KM7, the eighth relay KM8 and the ninth relay KM9 are attracted, after being attracted, the controller slowly applies current at the set current multiple, and uses switch input to monitor the output contact R1 of the comprehensive protector of the drawer circuit, the output contact R1 is closed to stop current output, and the action current value and action time of the test are displayed on the touch screen;

[0089] Step 5: manually reset the output contact R1 of the comprehensive protector of the drawer circuit, and turn on the thermal overload and locked-rotor protection of the comprehensive protector of the drawer circuit.

[0090] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A drawer circuit test system, the drawer circuit includes a primary circuit (1) and a secondary circuit (2), characterized in that The drawer circuit test system comprises: a primary circuit control unit (3) connected to the primary circuit (1) in a plug-in manner, used for controlling the primary circuit (1) to act; a secondary circuit control unit (4) connected to the secondary circuit (2) in a plug-in manner, used for controlling the secondary circuit (2) to act; a controller (5) electrically connected to the primary circuit control unit (3) and the secondary circuit control unit (4), used for sending control signals to the primary circuit control unit (3) and the secondary circuit control unit (4).

2. The drawer circuit test system of claim 1, wherein: The controller (5) is further electrically connected to a current analog signal output unit (6), the primary circuit control unit (3) comprises three relays, namely a first relay (KM1), a second relay (KM2) and a third relay (KM3), each relay comprises a coil and double contacts which act after the coil is energized, the coils of the three relays are connected to a power supply through corresponding first switches (K1, K2, K3), one end of the double contacts of the three relays is connected to the current analog signal output unit (6), the other end of the double contacts of the three relays is connected to each phase of three-phase electricity of the primary circuit (1) respectively, and each first switch (K1, K2, K3) is electrically connected to the controller (5).

3. The drawer circuit test system of claim 2, wherein: The primary circuit control unit (3) further comprises a fourth relay (KM4), a fifth relay (KM5), a sixth relay (KM6) and a ninth relay (KM9), each of which comprises a coil and double contacts that act after the coil is energized, the coils of the fourth relay (KM4), the fifth relay (KM5), the sixth relay (KM6) and the ninth relay (KM9) are connected to the power supply through corresponding second switches (K4, K5, K9), the two contacts at one end of the double contacts of the fourth relay (KM4) are connected, the two contacts at the other end of the double contacts of the fourth relay (KM4) are respectively connected to the second contact in the other end of the double contacts of the second relay (KM2) and the second contact in the other end of the double contacts of the third relay (KM3), the double contacts at one end of the fifth relay (KM5) and the sixth relay (KM6) are connected to the current analog signal output unit (6), the two contacts at the other end of the double contacts of the fifth relay (KM5) are respectively connected to the first contact in the other end of the double contacts of the second relay (KM2) and the first contact in the other end of the double contacts of the first relay (KM1), the two contacts at the other end of the double contacts of the sixth relay (KM6) are respectively connected to the first contact in the other end of the double contacts of the third relay (KM3) and the first contact in the other end of the double contacts of the second relay (KM2), the two contacts at one end of the double contacts of the ninth relay (KM9) are connected, the two contacts at the other end of the double contacts of the ninth relay (KM9) are respectively connected to the second contact in the other end of the double contacts of the first relay (KM1) and the second contact in the other end of the double contacts of the second relay (KM2), each second switch (K4, K5, K9) is electrically connected to the controller (5).

4. The drawer circuit test system of claim 3, wherein: The primary circuit control unit (3) further comprises a seventh relay (KM7) and an eighth relay (KM8), each of which comprises a coil and double contacts that act after the coil is energized, the coils of the seventh relay (KM7) and the eighth relay (KM8) are connected to a power supply through corresponding third switches (K7, K8), one end of the double contacts of the seventh relay (KM7) is connected to the current analog signal output unit (6), the other end of the double contacts of the seventh relay (KM7) is connected to the first contact in the other end of the double contacts of the first relay (KM1) and the second contact in the other end of the double contacts of the third relay (KM3), the two contacts of one end of the double contacts of the eighth relay (KM8) are connected to the first contact in the other end of the double contacts of the second relay (KM2) and the first contact in the other end of the double contacts of the third relay (KM3), the two contacts of the other end of the double contacts of the eighth relay (KM8) are connected, and each third switch (K7, K8) is electrically connected to the controller (5).

5. The drawer circuit test system of any of claims 1-4, wherein: The controller (5) is further electrically connected to a touch screen (7) capable of human-computer interaction.

6. The drawer circuit test system of claim 5, wherein: The secondary circuit control unit (4) comprises a control switch (KA) electrically connected to the controller (5), and the secondary circuit (2) comprises a contactor (KM) having a coil and three contacts that act after the coil is energized, one end of the control switch (KA) is connected to a power supply, the other end of the control switch (KA) is electrically connected to the coil of the contactor (KM), and the three contacts of the contactor (KM) are arranged on each phase of the three-phase power of the primary circuit (1).

7. The drawer circuit test system of claim 6, wherein: The drawer circuit further comprises a protection unit in the secondary circuit (2), and the controller (5) is further electrically connected to the protection unit for controlling the action of the protection unit.

8. The drawer circuit test system of any of claims 1-4, wherein: It further comprises a first connector terminal for plugging the primary circuit (1) and a second connector terminal for plugging the secondary circuit (2), the first connector terminal is further electrically connected to the primary circuit control unit (3), and the second connector terminal is electrically connected to the secondary circuit control unit (4).

9. The drawer circuit test system of claim 8, wherein: The test system comprises a shell with an opening, an inner cavity is formed in the shell for placing the drawer circuit through the opening, and the first connector terminal and the second connector terminal are arranged in the shell and partially exposed in the inner cavity.

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