Rapid phase sequence switching device for relay protection tester

Abstract

The utility model relates to a quick phase sequence switching device for a relay protection tester. The quick phase sequence switching device comprises a total loop fuse FU1 and a reset button SB4, the total loop fuse FU1 and the reset button SB4 are connected in series to the total loop; three branches are arranged on a control loop of the reset button SB4 in parallel; wherein the first branch comprises a springback button SB1, the springback button SB1 is connected with a normally open contact of the KM1 in parallel and is connected with a coil of the KM1 in series after passing through a normally closed contact of the KM2, and the indicator lamp is connected with the coil of the KM1 in parallel. The second branch comprises a springback button SB2, the springback button SB2 is connected with a normally open contact of the KM2 in parallel and is connected with a coil of the KM2 in series after passing through a normally closed contact of the KM3, and an indicator lamp is connected with the coil of the KM2 in parallel. According to the utility model, rapid phase sequence switching can be realized, frequent operation of the relay protection tester is reduced, the service life of the tester is prolonged, and the relay protection tester has the characteristics of simple structure, convenience and practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of power transformation of a track power supply system, in particular to a fast switching phase sequence device of a relay protection tester. Background Art

[0002] The relay protection verification test can simulate the 110kV and 35kV switch cabinet ring network cables. When the lower load fails or is in an abnormal operating state, the comprehensive protection device, differential protection device, non-electrical protection and standby automatic protection are normally started and the circuit breaker trips or sends a signal. To ensure the reliable operation of the switch, the subway power supply department regularly conducts relay protection verification tests on the protection devices of each switch cabinet.

[0003] During the relay protection verification operation of the switch cabinet, maintenance personnel use the relay protection tester to perform protection verification on the A, B, and C phases of the protection device in turn. At the same time, they need to frequently switch the phase sequence or repeatedly plug and unplug the phase sequence wiring on the instrument operation interface. On the one hand, this leads to a very high error rate during the operation, and it is easy to make mistakes or reverse connections when plugging and unplugging terminals and wiring. On the other hand, it causes the operation to take too long, increasing labor costs. Utility Model Content

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the utility model is to provide a fast switching phase sequence device for a relay protection tester, which can realize fast switching of phase sequence, reduce frequent operation of the relay protection tester, extend the service life of the instrument, and has the characteristics of simple structure, convenience and practicality.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A relay protection tester fast switching phase sequence device, comprising a main circuit fuse FU1 and a reset button SB4; the main circuit fuse FU1 and the reset button SB4 are connected in series on the main circuit;

[0007] The control circuit of the reset button SB4 is provided with three branches in parallel;

[0008] The first branch includes a rebound button SB1, which is connected in parallel to the normally open contact of KM1 itself, and is connected in series to the KM1 coil through the normally closed contact of KM2, and the indicator light is connected in parallel to the KM1 coil.

[0009] The second branch includes a rebound button SB2, which is connected in parallel with the normally open contact of KM2 itself, and is connected in series with the KM2 coil through the normally closed contact of KM3, and the indicator light is connected in parallel with the KM2 coil.

[0010] The third branch includes a rebound button SB3, which is connected in parallel with the normally open contact of KM3 itself, and is connected in series with the KM3 coil after passing through the normally closed contact of KM1, and the indicator light is connected in parallel with the KM3 coil.

[0011] The normally closed contact of KM2 is interlocked with the second branch. When SB2 is pressed, the normally closed contact of KM2 opens, cutting off the first branch.

[0012] The normally closed contact of KM3 is interlocked with the third branch. When SB3 is pressed, the normally closed contact of KM3 opens, cutting off the second branch.

[0013] The normally closed contact of KM1 is interlocked with the third branch. After pressing SB1, the normally closed contact of KM3 opens, cutting off the third branch.

[0014] The rebound button SB1 is provided with a contact NC1 / NO1 inside, the rebound button SB2 is provided with a contact NC1 / NO1 inside, and the rebound button is provided with a contact NC1 / NO1 inside.

[0015] Switch to the button SB1 of the A phase circuit, the normally closed contact of the contactor KM2 and the normally open contact KM1 connected in parallel to the SB1 circuit;

[0016] Switch to the button SB2 of the B phase circuit, the normally closed contact of the contactor KM3, the contactor KM2 and the normally open contact KM2 connected in parallel to the SB2 circuit;

[0017] Switch to the button SB3 of the C phase circuit, the normally closed contact of the contactor KM1, the contactor KM3 and the normally open contact KM3 connected in parallel in the SB3 circuit.

[0018] Beneficial effects of the utility model:

[0019] The switch cabinet protection device of the utility model is widely used in relay protection calibration and maintenance and fault processing.

[0020] Through the SB1, SB2, and SB3 buttons, the coils of relays KM1, KM2, and KM3 are manually controlled to be energized, so that the corresponding contacts of the relays change, thereby changing the changes in the output end of the electric quantity. The time for checking and repairing the switch cabinet protection device and troubleshooting is shortened by about 1 / 3 compared with before, and the phase sequence can be quickly switched, the frequent operation of the relay protection tester is reduced, the service life of the instrument is extended, and the operation efficiency is effectively improved.

[0021] The utility model device can reduce the number of maintenance personnel of the relay protection tester, reduce the manpower cost, save time and labor in operation, reduce the work intensity, and make the relay protection verification faster, more reliable and safer.

[0022] After the use of the utility model device, the maintenance personnel are prevented from re-plugging and plugging the secondary terminal wiring of the switch cabinet, which greatly protects the personal safety of the on-site operators and the safety of the equipment.

[0023] The utility model device can reduce the plugging and unplugging of terminals and wiring of equipment, avoids equipment failure caused by repeated plugging and unplugging of wiring terminals, and reduces the equipment failure rate.

[0024] The utility model can implement simultaneous detection of multiple devices for protection devices with the same set value. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a control circuit principle diagram of the utility model device.

[0026] Figure 2 It is a primary circuit diagram of the utility model device.

[0027] Figure 3 This is a physical wiring diagram of the circuit of the utility model device DETAILED DESCRIPTION

[0028] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown: a relay protection tester fast switching phase sequence device, including a main circuit fuse FU1 and a reset button SB4; the main circuit fuse FU1 and the reset button SB4 are connected in series on the main circuit.

[0030] The control circuit of the reset button SB4 is provided with three branches in parallel;

[0031] Among them. The first branch is the rebound button SB1 in parallel with the normally open contact of KM1 itself, and then connected in series with the KM1 coil through the normally closed contact of KM2, and the indicator light is connected in parallel with the KM1 coil. The normally closed contact of KM2 is interlocked with the second branch. After pressing SB2, the normally closed contact of KM2 opens and cuts off the first branch.

[0032] The second branch is a rebound button SB2 in parallel with KM2's own normally open contact, which is connected in series with the KM2 coil through the KM3 normally closed contact, and the indicator light is connected in parallel with the KM2 coil. The KM3 normally closed contact is interlocked with the third branch. After pressing SB3, the KM3 normally closed contact opens, cutting off the second branch.

[0033] The third branch is a rebound button SB3 in parallel with KM3's own normally open contact, which is connected in series with the KM3 coil through the KM1 normally closed contact, and the indicator light is connected in parallel with the KM3 coil. The KM1 normally closed contact is interlocked with the third branch. After pressing SB1, the KM3 normally closed contact opens, cutting off the third branch.

[0034] Switch to the button SB1 of the A phase circuit, the normally closed contact of the contactor KM2 and the normally open contact KM1 connected in parallel to the SB1 circuit;

[0035] Switch to the button SB2 of the B phase circuit, the normally closed contact of the contactor KM3, the contactor KM2 and the normally open contact KM2 connected in parallel to the SB2 circuit;

[0036] Switch to the button SB3 of the C phase circuit, the normally closed contact of the contactor KM1, the contactor KM3 and the normally open contact KM3 connected in parallel in the SB3 circuit.

[0037] The external AC 220V power supply is input through the circuit breaker, and the fuse FU1 is connected in series. Figure 3 After pressing the reset button in the circuit), it passes through the three circuits of phase A, phase B and phase C respectively. The button switches corresponding to each circuit are SB1, SB2 and SB3 respectively.

[0038] 1. Phase A test: When SB1 ( Figure 3 Press the A phase button in the middle to energize the KM1 coil, and the normally open contact of KM1 in parallel with SB1 is closed, making the KM1 coil self-holding. Figure 2 The main circuit KM1 remains closed, and the power of the relay protection tester is output to the A phase of the protection device through the closure of KM1. At the same time, the HLY indicator light connected in parallel with the coil lights up, indicating that the output of phase A is increasing.

[0039] 2. Phase B test: When the phase A test is completed, press the reset button SB4 ( Figure 3 ), check the B phase, and when SB2 ( Figure 3 Press the B phase button in the middle to energize the KM2 coil, and the normally open contact of KM2 in parallel with SB2 is closed, making the KM2 coil self-holding. Figure 2 The main circuit KM2 remains closed, and the power of the relay protection tester is output to the B phase of the protection device through the closure of KM2. At the same time, the HLG indicator light connected in parallel with the coil lights up, indicating that the B phase is increasing the output.

[0040] 3. C phase test: When the B phase test is completed, press the reset button SB4 ( Figure 3 ), check the C phase, and when SB3 ( Figure 3 Press the C phase button in the middle to energize the KM3 coil, and the normally open contact of KM3 in parallel with SB3 is closed, making the KM3 coil self-holding. Figure 2 The main circuit KM3 remains closed, and the power of the relay protection tester is output to the C phase of the protection device through the closure of KM3. At the same time, the HLR indicator light connected in parallel with the coil lights up, indicating that the C phase is increasing the output.

[0041] The device is operated in the order of three phases A, B, and C. Press the reset button SB4 and the device returns to the relay protection verification ready state.

[0042] like Figure 3 As shown: The working principle of the utility model:

[0043] Turn on the power of the operation box, press the A phase button SB1, the contact KM2 remains normally closed, the contactor KM1 is energized, the contact KM1 connected in parallel at both ends of the A phase button SB1 changes from normally open to normally closed, the relay protection tester switches the test phase sequence to the A phase, and the A phase test is verified. At the same time, the yellow indicator HLY connected in parallel to the KM1 coil lights up, indicating that the A phase test is in progress; press the B phase button SB2 in sequence, the contact KM3 remains normally closed, the contactor KM2 is energized, and the contact KM2 connected in parallel at both ends of the B phase button SB2 changes from normally open to normally closed. Normally closed, the relay protection tester switches the test phase sequence to phase B, and performs phase B test and verification. At the same time, the green indicator light HLG connected in parallel to the KM2 coil lights up, indicating that phase B test and verification is in progress; press the C phase button SB3, contact KM1 remains normally closed, contactor KM3 is energized, and the contacts KM3 connected in parallel at both ends of the C phase button SB3 change from normally open to normally closed. The relay protection tester switches the test phase sequence to phase C, and performs phase C test and verification. At the same time, the red indicator light HLR connected in parallel to the KM3 coil lights up, indicating that phase C test and verification is in progress. The device is operated in the order of phases A, B, and C. Press the reset button SB4 to restore the device to the test and verification ready state.

Claims

1. A fast switching phase sequence device for a relay protection tester, characterized in that: It includes a main circuit fuse FU1 and a reset button SB4; the main circuit fuse FU1 and the reset button SB4 are connected in series to the main circuit; The control circuit of the reset button SB4 is provided with three branches in parallel; The first branch includes a rebound button SB1, which is connected in parallel to the normally open contact of KM1 itself, and is connected in series to the KM1 coil through the normally closed contact of KM2, and the indicator light is connected in parallel to the KM1 coil; The second branch includes a rebound button SB2, which is connected in parallel to the normally open contact of KM2 itself, and is connected in series to the KM2 coil through the normally closed contact of KM3, and the indicator light is connected in parallel to the KM2 coil; The third branch includes a rebound button SB3, which is connected in parallel with the normally open contact of KM3 itself, and is connected in series with the KM3 coil after passing through the normally closed contact of KM1, and the indicator light is connected in parallel with the KM3 coil.

2. A fast switching phase sequence device for a relay protection tester according to claim 1, characterized in that: The normally closed contact of KM2 is interlocked with the second branch.

3. A fast switching phase sequence device for a relay protection tester according to claim 1, characterized in that: The normally closed contact of KM3 is interlocked with the third branch.

4. A fast switching phase sequence device for a relay protection tester according to claim 1, characterized in that: The normally closed contact of KM1 is interlocked with the third branch.

5. A fast switching phase sequence device for a relay protection tester according to claim 1, characterized in that: The rebound button SB1 is provided with a contact NC1 / NO1 inside, the rebound button SB2 is provided with a contact NC1 / NO1 inside, and the rebound button is provided with a contact NC1 / NO1 inside.

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