High-voltage relay test circuit
By integrating a high-voltage relay test circuit with a leakage current protector, contactor, emergency stop switch, and bridge circuit, the problems of inability to perform multiple tests and safety hazards in existing technologies are solved, achieving efficient and safe high-voltage relay testing.
Patent Information
- Application Number
- CN202423266892.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing high-voltage relay test circuits cannot perform multiple tests simultaneously, cannot clearly determine whether each contact is working properly, pose safety hazards, and may damage the relay when high voltage is applied.
A high-voltage relay test circuit was designed, which integrates a leakage current protector, a contactor, an emergency stop switch, a reset switch, and a bridge circuit. By detecting the working status of each contact, the circuit is integrated and tested with a withstand voltage tester. Multiple control switches are used to prevent damage to the relay when it is directly connected to high voltage.
It enables convenient determination of multiple tests, improves the safety of the testing process, clearly determines the contact status, prevents relay failure, and reduces safety risks.
Smart Images
Figure CN223857357U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to relay test field especially is related to a high voltage relay test circuit. BACKGROUND
[0002] The test of high voltage relay includes:
[0003] 1) detecting the existence of DC catenary voltage to prevent traction equipment overheating.
[0004] 2) detection of catenary voltage when multiple catenary voltages are running simultaneously.
[0005] 3) detecting the rise and fall of pantograph to prevent intermittent tripping caused by instantaneous disconnection of pantograph.
[0006] The existing high voltage relay test circuit cannot perform multiple tests, cannot obviously determine whether each contact point is working normally, cannot avoid board card failure, and directly connects high voltage relay to high voltage, which has safety hazards. UTILITY MODEL CONTENT
[0007] The utility model aims at realizing integrated multiple tests, obviously determining the working state of each contact point while reducing high voltage risk, and provides a high voltage relay test circuit.
[0008] The utility model can be realized by the following technical scheme:
[0009] A high voltage relay test circuit, the device includes an electric leakage protector Q1, one end of the electric leakage protector Q1 is connected with input voltage, the other end is connected with intermediate voltage line L1 and N1, the intermediate voltage line L1 and N1 are connected with one end of the coil of contactor K1, the other end of the coil of contactor K1 is connected with one end of emergency stop switch, the other end of emergency stop switch is connected with one end of first reset switch, the other end of first reset switch is connected with one end of second reset switch, the other end of second reset switch is grounded;
[0010] The intermediate voltage line L1 and N1 are connected with the first normally open end, the second normally open end and the third normally open end of contactor K1, the first common end and the second common end of contactor K1 are connected with power supply line L, and the third common end is connected with power supply line N.
[0011] The power supply line L and the power supply line N are connected with first power supply, second power supply, voltage resistance tester and bridge circuit.
[0012] The positive input end of the first power supply is connected with the signal input positive pole of the high-voltage relay, the negative input end of the first power supply is connected with the signal input negative pole of the high-voltage relay, the positive input end of the second power supply is connected with the external voltage positive pole of the high-voltage relay, and the positive input end of the second power supply is connected with the external voltage negative pole of the high-voltage relay.
[0013] The normally open contact pair of the high-voltage relay is connected with the first input end and the second input end of the first electric bridge, and the normally closed contact pair of the high-voltage relay is connected with the first input end and the second input end of the second electric bridge.
[0014] Further, the other end of the coil of the contactor K1 is connected with the normally closed end of the emergency stop switch, and the common end of the emergency stop switch is connected with one end of the first reset switch.
[0015] Further, one end of the first reset switch is a normally closed end, the common end of the first reset switch is connected with the normally open end of the second reset switch, and the common end of the second reset switch is grounded.
[0016] Further, the normally open end of the second reset switch is connected with the fourth normally open end of the contactor K1.
[0017] Further, the common end of the second reset switch is connected with the fourth common end of the contactor K1.
[0018] Further, the signal input positive pole is one end of the coil of the high-voltage relay.
[0019] Further, the normally open contact pair comprises a normally open end of the high-voltage relay and a common end of the high-voltage relay, and the normally open end of the high-voltage relay and the common end of the high-voltage relay are connected with the first input end and the second input end of the first electric bridge respectively.
[0020] Further, the normally closed contact pair comprises a normally closed end of the high-voltage relay and a common end of the high-voltage relay, and the normally closed end of the high-voltage relay and the common end of the high-voltage relay are connected with the first input end and the second input end of the second electric bridge respectively.
[0021] Further, the electric bridge comprises a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1 and the second resistor R2 are connected with each other, a connection point being D, the first resistor R1 and the third resistor R3 are connected with each other, a connection point being A, the third resistor R3 and the second input end of the electric bridge are connected, a connection point being B, the second resistor R2 and the first input end of the electric bridge are connected, a connection point being C, and the connection point A and the connection point C are connected with the power supply positive pole and the power supply negative pole of the electric bridge respectively.
[0022] Further, the second resistor R2 is a sliding resistor.
[0023] Compared with the prior art, the utility model has the following beneficial effects:
[0024] The utility model discloses a detection circuit is arranged on each contact point can obviously determine each contact point working condition, and the power supply and voltage withstand tester are integrated, and the process of testing is more simple and convenient, in addition, the utility model discloses a plurality of control switch, and then prevent the relay from being damaged after the fault when being directly connected to high voltage, improve the security of detection process. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 It is switch part schematic diagram of the utility model;
[0026] Figure 2 It is bridge structure schematic diagram of the utility model. DETAILED DESCRIPTION
[0027] The utility model will be explained in detail below in combination with the drawings and specific embodiments. The embodiment is implemented on the premise of the technical scheme of the utility model, and gives detailed implementation mode and specific operation process, but the protection scope of the utility model is not limited to the following examples.
[0028] It should be noted that: similar signs and letters show similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.
[0029] Some embodiments of the utility model will be explained in detail below in combination with the drawings. In the case of no conflict, the following examples and features in the examples can be combined with each other.
[0030] The application provides a high-voltage relay test circuit, the device comprises a leakage protector Q1, one end of the leakage protector Q1 is connected with an input voltage, the other end is connected with an intermediate voltage line L1 and N1, the intermediate voltage line L1 and N1 are connected with one end of a coil of a contactor K1, the other end of the coil of the contactor K1 is connected with one end of an emergency stop switch, the other end of the emergency stop switch is connected with one end of a first reset switch, the other end of the first reset switch is connected with one end of a second reset switch, and the other end of the second reset switch is grounded.
[0031] The intermediate voltage line L1 and N1 are connected with a first normally open end, a second normally open end and a third normally open end of the contactor K1, a first common end and a second common end of the contactor K1 are connected with a power supply line L, and a third common end is connected with a power supply line N.
[0032] The power supply line L and the power supply line N are connected with a first power supply, a second power supply, a voltage withstand tester and a bridge circuit.
[0033] The positive input end of the first power supply is connected with the signal input positive pole of the high-voltage relay, the negative input end of the first power supply is connected with the signal input negative pole of the high-voltage relay, the positive input end of the second power supply is connected with the external voltage positive pole of the high-voltage relay, and the positive input end of the second power supply is connected with the external voltage negative pole of the high-voltage relay.
[0034] The normally open contact pair of the high-voltage relay is connected with the first input end and the second input end of the first electric bridge, and the normally closed contact pair of the high-voltage relay is connected with the first input end and the second input end of the second electric bridge.
[0035] The other end of the coil of the contactor K1 is connected with the normally closed end of the emergency stop switch, and the common end of the emergency stop switch is connected with one end of the first reset switch.
[0036] The one end of the first reset switch is a normally closed end, the common end of the first reset switch is connected with the normally open end of the second reset switch, and the common end of the second reset switch is grounded.
[0037] The normally open end of the second reset switch is connected with the fourth normally open end of the contactor K1.
[0038] The common end of the second reset switch is connected with the fourth common end of the contactor K1.
[0039] The signal input positive pole is one end of the coil of the high-voltage relay.
[0040] The normally open contact pair comprises a normally open end of the high-voltage relay and a common end of the high-voltage relay, and the normally open end of the high-voltage relay and the common end of the high-voltage relay are connected with the first input end and the second input end of the first electric bridge respectively.
[0041] The normally closed contact pair comprises a normally closed end of the high-voltage relay and a common end of the high-voltage relay, and the normally closed end of the high-voltage relay and the common end of the high-voltage relay are connected with the first input end and the second input end of the second electric bridge respectively.
[0042] The electric bridge comprises a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1 and the second resistor R2 are connected with each other, a connection point is D, the first resistor R1 and the third resistor R3 are connected with each other, a connection point is A, the third resistor R3 and the second input end of the electric bridge are connected, a connection point is B, the second resistor R2 and the first input end of the electric bridge are connected, a connection point is C, and the connection point A and the connection point C are connected with the power supply positive pole and the power supply negative pole of the electric bridge respectively.
[0043] The second resistor R2 is a sliding resistor. Figure 1 As shown in the figure, wherein S1 is an emergency stop switch, S2 is a first reset switch, and S3 is a second reset switch.
[0044] The working principle of the utility model is as follows:
[0045] The input voltage passes through the leakage protector Q1, and when the leakage protector Q1 normally works, the voltage enters the intermediate voltage lines L1 and N1. The intermediate voltage lines L1 and N1 pass through the coil of the contactor K1. The first normally open end, the second normally open end and the third normally open end of the contactor K1 are closed, the first emergency stop switch is in the initial state of being closed, the emergency stop switch and the first reset switch are in the state of being closed when normally working, the second reset switch is in the state of being open when normally working, the fourth normally open end of the contactor K1 is closed, and the loop is turned on. The voltage of the power supply lines L and N supplies power to the first power supply, the second power supply, the voltage withstand tester and the bridge circuit.
[0046] The utility model disciously realize input and output voltage test, control first power supply and second power supply work, high voltage relay action at this time, can detect the impedance between contact pair through bridge circuit. Meanwhile the utility model disciously carry out voltage withstand test, cut off first power supply and second power supply. Control voltage withstand tester work, voltage withstand tester connects the signal input positive pole and signal input negative pole of high voltage relay, connects external voltage positive pole and external voltage negative pole simultaneously, can detect the impedance between contact pair through bridge circuit, obtains voltage withstand test result.
[0047] In the utility model, integrated input and output voltage test and voltage withstand test make the detection of high voltage relay more convenient, and the input voltage of the utility model can be controlled through the emergency stop switch and the two reset switches. The emergency stop switch includes a contact and a lever. When a problem occurs in the circuit, the lever is moved by the button, and the lever controls the disconnection of the normally closed end and the common end of the emergency stop switch. At this time, the circuit is powered off, which can protect the relay. In addition, the lever of the reset switch can also be controlled to move. The first reset switch is normally closed. When the lever of the first reset switch is controlled to move, the first reset switch is first disconnected and then restored to the normally closed state, thereby playing a reset role. The second reset switch is normally open. When the lever of the second reset switch is controlled to move, the second reset switch is first closed and then restored to the normally open state, thereby playing a reset role. The utility model disciously sets multiple control switches, thereby preventing the relay from being damaged after a fault occurs when the relay is directly connected to high voltage, and improving the safety of the detection process.
[0048] The specific principle of detecting the impedance between the contact pair is that the contact pair is connected between BC, and when the display of the galvanometer Vg is 0, the resistances R1, R2 and R3 and the resistance of the contact pair satisfy the ratio condition R1 / R3=R2 / Rcontact pair by adjusting the sliding resistor R2 between CD. The bridge structure diagram is as follows: Figure 2The utility model can obviously determine the working state of each contact. When the high-voltage relay is turned on and normally works, the normally open contact is closed, the impedance between the normally open contact pair is small, <20mΩ, and the impedance between the normally closed contact pair is large, basically equivalent to being disconnected. If the high-voltage relay is internally disconnected due to a fault, the abnormality can be found through bridge detection impedance, and the working state of each contact can be obviously determined.
[0049] In the utility model, the model of Q1 is 5SU9356-1CR16, and the model of the emergency stop switch and the reset switch can be LAY39B-LA38-11BN-G or the like. The model of the contactor can be CJ20J-10A and CJ20J-16A. The model of the withstand voltage tester is CS2672C. The model of the sliding rheostat of the bridge can be FZW100X35.
[0050] The above describes the preferred embodiments of the utility model in detail. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative labor. Therefore, any technical scheme obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the utility model should be within the protection scope defined by the claims.
Claims
1. A high voltage relay testing circuit, characterized by, The circuit comprises a leakage protector Q1, one end of the leakage protector Q1 is connected with an input voltage, the other end is connected with an intermediate voltage line L1 and N1, the intermediate voltage line L1 and N1 are connected with one end of a coil of a contactor K1, the other end of the coil of the contactor K1 is connected with one end of an emergency stop switch, the other end of the emergency stop switch is connected with one end of a first reset switch, the other end of the first reset switch is connected with one end of a second reset switch, the other end of the second reset switch is grounded. The intermediate voltage line L1 and N1 are connected with a first normally open end, a second normally open end and a third normally open end of the contactor K1, a first common end and a second common end of the contactor K1 are connected with a power supply line L, and a third common end is connected with a power supply line N. The power supply line L and the power supply line N are connected with a first power supply, a second power supply, a voltage withstand tester and a bridge circuit. A positive input end of the first power supply is connected with a signal input positive pole of a high-voltage relay, a negative input end of the first power supply is connected with a signal input negative pole of the high-voltage relay, a positive input end of the second power supply is connected with an external voltage positive pole of the high-voltage relay, and a positive input end of the second power supply is connected with an external voltage negative pole of the high-voltage relay. A pair of normally open contacts of the high-voltage relay are connected with a first input end and a second input end of a first bridge, and a pair of normally closed contacts of the high-voltage relay are connected with a first input end and a second input end of a second bridge.
2. The high voltage relay testing circuit of claim 1, wherein, The other end of the coil of the contactor K1 is connected with a normally closed end of the emergency stop switch, and a common end of the emergency stop switch is connected with one end of the first reset switch.
3. The high voltage relay testing circuit of claim 2, wherein, One end of the first reset switch is a normally closed end, a common end of the first reset switch is connected with a normally open end of the second reset switch, and a common end of the second reset switch is grounded.
4. The high voltage relay testing circuit of claim 3, wherein, The normally open end of the second reset switch is connected with a fourth normally open end of the contactor K1.
5. The high voltage relay testing circuit of claim 4, wherein, The common end of the second reset switch is connected with a fourth common end of the contactor K1.
6. The high voltage relay testing circuit of claim 1, wherein, The signal input positive pole is one end of a coil of the high-voltage relay.
7. The high voltage relay testing circuit of claim 1, wherein, The pair of normally open contacts comprise a normally open end of the high-voltage relay and a common end of the high-voltage relay, and the normally open end of the high-voltage relay and the common end of the high-voltage relay are respectively connected with the first input end and the second input end of the first bridge.
8. The high voltage relay testing circuit of claim 1, wherein, The pair of normally closed contacts comprise a normally closed end of the high-voltage relay and a common end of the high-voltage relay, and the normally closed end of the high-voltage relay and the common end of the high-voltage relay are respectively connected with the first input end and the second input end of the second bridge.
9. The high voltage relay testing circuit of claim 1, wherein, The bridge comprises a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1 and the second resistor R2 are connected with each other, a connection point is D, the first resistor R1 and the third resistor R3 are connected with each other, a connection point is A, the third resistor R3 and a second input end of the bridge are connected, a connection point is B, the second resistor R2 and a first input end of the bridge are connected, a connection point is C, and the connection point A and the connection point C are respectively connected with a power supply positive pole and a power supply negative pole of the bridge.
10. The high voltage relay testing circuit of claim 9, wherein, The second resistor R2 is a sliding resistor.