Secondary power supply circuit for double-circuit incoming line of flame-proof high-voltage combined power distribution device

Abstract

The embodiment of the utility model provides a secondary power supply circuit for a double-circuit incoming line of an explosion-proof type high-voltage combined power distribution device. The secondary power supply circuit comprises a first self-supply power supply loop, a second self-supply power supply loop, an external supply power supply loop, a double-power-supply switching device U1 and a double-power-supply switching device U2, the first self-power supply loop and the second self-power supply loop are the same and comprise a high-voltage control transformer T1, a secondary side main switch S1, circuit breakers ZK0, ZK1, ZK2 and ZK3, an overvoltage relay GY and an undervoltage relay QY; according to the utility model, the two self-power supply loops are configured, and any one of the self-power supply loops can automatically ensure 220v voltage power supply of the secondary side when the high voltage of the primary side is switched; when the two self-powered power supplies are powered off, the external power supply can be timely and automatically switched to supply power to the secondary side electric equipment with 220v voltage.

Description

Technical Field

[0001] The utility model relates to an electric circuit, in particular to a secondary power supply circuit for double-circuit incoming lines of an explosion-proof high-voltage combined power distribution device. Background Art

[0002] At present, the voltage level of explosion-proof high-voltage combined distribution devices is generally 10kV or 6kV. When the working environment voltage of the equipment is switched from 10kV to 6kV, the staff needs to replace the control transformer inside the equipment, and replace 10kV / 220V with 6kV / 220V; when the high voltage is switched, the power supply on the secondary side is often affected.

[0003] Some coal mines are equipped with two sets of self-powered power supplies underground. However, when the two sets of self-powered power supplies are cut off due to maintenance needs, it is necessary to switch to an external power supply to power the secondary side equipment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the embodiment of the utility model provides a secondary power supply circuit for the double-circuit incoming line of the explosion-proof high-voltage combined power distribution device, which is equipped with two self-power supply circuits, and any self-power supply circuit can automatically ensure the 220v voltage supply on the secondary side when the primary high voltage is switched; when both self-power supplies are powered off, they can automatically switch to the external power supply in time to supply 220v voltage to the secondary side electrical equipment. In order to achieve the above technical objectives, the technical solution adopted by the embodiment of the utility model is:

[0005] The embodiment of the utility model provides a secondary power supply circuit for double-circuit incoming lines of an explosion-proof high-voltage combined power distribution device, including a first self-power supply circuit, a second self-power supply circuit, an external power supply circuit, a dual power supply switching device U1, and a dual power supply switching device U2;

[0006] The first self-power supply circuit is the same as the second self-power supply circuit, including: a high-voltage control transformer T1, a secondary side main switch S1, circuit breakers ZK0, ZK1, ZK2, ZK3, an overvoltage relay GY, and an undervoltage relay QY;

[0007] The primary side of the high-voltage control transformer T1 is used to connect the primary side high voltage; the secondary side of the high-voltage control transformer T1 includes a main winding and an auxiliary winding; wherein the main winding is provided with an intermediate tap;

[0008] One end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the first link of the secondary side main switch S1, the other end of the first link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK0, the other end of the circuit breaker ZK0 is connected to one end of the normally open contact QY-1 of the undervoltage relay QY, the other end of the normally open contact QY-1 of the undervoltage relay QY is connected to one end of the normally closed contact GY-1 of the overvoltage relay GY, and the other end of the normally closed contact GY-1 of the overvoltage relay GY serves as the first output end of the self-power supply circuit;

[0009] One end of the middle tap on the secondary side of the high-voltage control transformer T1 is connected to one end of the second link of the secondary side main switch S1, the other end of the second link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK1, the other end of the circuit breaker ZK1 is connected to one end of the power supply end of the undervoltage relay QY, one end of the power supply end of the overvoltage relay GY and one end of the normally closed contact QY-2 of the undervoltage relay QY, the normally closed contact QY-2 of the undervoltage relay QY is connected to one end of the normally open contact GY-2 of the overvoltage relay GY, and the other end of the normally open contact GY-2 of the overvoltage relay GY is connected to the first output end of the self-power supply circuit;

[0010] The other end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the third connection of the secondary side main switch S1, the other end of the third connection of the secondary side main switch S1 is connected to one end of the circuit breaker ZK2, the other end of the circuit breaker ZK2 is connected to the other end of the power supply end of the undervoltage relay QY and the other end of the power supply end of the overvoltage relay GY, and serves as the second output end of the self-power supply circuit;

[0011] One end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fourth link of the secondary side main switch S1, the other end of the fourth link of the secondary side main switch S1 is connected to one end of the first link of the circuit breaker ZK3, the other end of the first link of the circuit breaker ZK3 is connected to one end of the detection end of the undervoltage relay QY and one end of the detection end of the overvoltage relay GY;

[0012] The other end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fifth connection of the secondary side main switch S1, the other end of the fifth connection of the secondary side main switch S1 is connected to one end of the second connection of the circuit breaker ZK3, the other end of the second connection of the circuit breaker ZK3 is connected to the other end of the detection end of the undervoltage relay QY and the other end of the detection end of the overvoltage relay GY;

[0013] The overvoltage relay GY and the undervoltage relay QY are configured such that when the primary side of the high-voltage control transformer T1 is connected to the first high voltage, the overvoltage relay GY is activated but the undervoltage relay QY is not activated, and when the primary side of the high-voltage control transformer T1 is connected to the second high voltage, the overvoltage relay GY is not activated but the undervoltage relay QY is activated; the first high voltage is greater than the second voltage;

[0014] The first output terminal of the first self-powered power supply circuit is connected to one end of the first connection of the switch QF1 in the dual power supply switching device U1; the second output terminal of the first self-powered power supply circuit is connected to one end of the second connection of the switch QF1 in the dual power supply switching device U1;

[0015] The first output terminal of the second self-power supply circuit is connected to one end of the first connection of the switch QF2 in the dual power supply switching device U1; the second output terminal of the second self-power supply circuit is connected to one end of the second connection of the switch QF2 in the dual power supply switching device U1;

[0016] The other end of the first connection of the switch QF1 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF1 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2;

[0017] The other end of the first connection of the switch QF2 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF2 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2;

[0018] The first output terminal of the external power supply circuit is connected to one end of the first connection of the switch QF4 in the dual power supply switching device U2; the second output terminal of the external power supply circuit is connected to one end of the second connection of the switch QF4 in the dual power supply switching device U2;

[0019] The other end of the first connection of the switch QF3 in the dual power switching device U2 and the other end of the first connection of the switch QF4 are connected and serve as the first power supply end of the power-consuming equipment;

[0020] The other end of the second connection of the switch QF3 in the dual power switching device U2 and the other end of the second connection of the switch QF4 are connected and serve as the second power supply end of the electrical equipment.

[0021] Furthermore, the external power supply circuit includes a circuit breaker ZK6; one end of the first connection and one end of the second connection of the circuit breaker ZK6 are used to connect to the external power supply; the other end of the first connection of the circuit breaker ZK6 is connected to one end of the first connection of the switch QF4 in the dual power switching device U2 as the first output end of the external power supply circuit; the other end of the second connection of the circuit breaker ZK6 is connected to one end of the second connection of the switch QF4 in the dual power switching device U2 as the second output end of the external power supply circuit.

[0022] Furthermore, the secondary power supply circuit for the double-circuit incoming line of the flameproof high-voltage combined distribution device also includes a dual power switching device display XSQ, and the dual power switching device display XSQ is respectively connected to the dual power switching device U1 and the dual power switching device U2.

[0023] The beneficial effects brought by the technical solution provided by the embodiment of the utility model are:

[0024] 1) Two self-powered circuits are used, so the busbars on the primary side can back up each other, improving the safety of power supply; it also provides convenience for the maintenance of the primary side busbar.

[0025] 2) The high voltage on the primary side can be switched between 10kV and 6kv without affecting the 220v voltage on the secondary side, thus ensuring continuous power supply to electrical equipment on the secondary side.

[0026] 3) In extreme cases, it can also automatically switch to an external power supply to supply power to secondary-side electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the circuit in the embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] like Figure 1 As shown, a secondary power supply circuit for a double-circuit incoming line of a flameproof high-voltage combined power distribution device proposed in an embodiment of the utility model includes a first self-power supply circuit, a second self-power supply circuit, an external power supply circuit, a dual power supply switching device U1, and a dual power supply switching device U2;

[0030] The first self-power supply circuit is the same as the second self-power supply circuit. Taking the first self-power supply circuit as an example, it includes: a high-voltage control transformer T1, a secondary side main switch S1, circuit breakers ZK0, ZK1, ZK2, ZK3, an overvoltage relay GY, and an undervoltage relay QY;

[0031] The primary side of the high-voltage control transformer T1 is used to connect the primary side high voltage; in this embodiment, the primary sides of the first self-powered power supply circuit and the second self-powered power supply circuit are connected to the I section bus and the II section bus respectively; the high voltage on the I section bus and the II section bus can be switched between 10kV and 6kv; the secondary side of the high-voltage control transformer T1 includes a main winding and an auxiliary winding; wherein the main winding is provided with an intermediate tap; the main winding can output a 220v voltage when the primary side high voltage is 6kv, and the intermediate tap can output a 220v voltage when the primary side high voltage is 10kv;

[0032] One end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the first link of the secondary side main switch S1, the other end of the first link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK0, the other end of the circuit breaker ZK0 is connected to one end of the normally open contact QY-1 of the undervoltage relay QY, the other end of the normally open contact QY-1 of the undervoltage relay QY is connected to one end of the normally closed contact GY-1 of the overvoltage relay GY, and the other end of the normally closed contact GY-1 of the overvoltage relay GY serves as the first output end of the self-power supply circuit;

[0033] One end of the middle tap on the secondary side of the high-voltage control transformer T1 is connected to one end of the second link of the secondary side main switch S1, the other end of the second link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK1, the other end of the circuit breaker ZK1 is connected to one end of the power supply end of the undervoltage relay QY, one end of the power supply end of the overvoltage relay GY and one end of the normally closed contact QY-2 of the undervoltage relay QY, the normally closed contact QY-2 of the undervoltage relay QY is connected to one end of the normally open contact GY-2 of the overvoltage relay GY, and the other end of the normally open contact GY-2 of the overvoltage relay GY is connected to the first output end of the self-power supply circuit;

[0034] The other end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the third connection of the secondary side main switch S1, the other end of the third connection of the secondary side main switch S1 is connected to one end of the circuit breaker ZK2, the other end of the circuit breaker ZK2 is connected to the other end of the power supply end of the undervoltage relay QY and the other end of the power supply end of the overvoltage relay GY, and serves as the second output end of the self-power supply circuit;

[0035] One end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fourth link of the secondary side main switch S1, the other end of the fourth link of the secondary side main switch S1 is connected to one end of the first link of the circuit breaker ZK3, the other end of the first link of the circuit breaker ZK3 is connected to one end of the detection end of the undervoltage relay QY and one end of the detection end of the overvoltage relay GY;

[0036] The other end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fifth connection of the secondary side main switch S1, the other end of the fifth connection of the secondary side main switch S1 is connected to one end of the second connection of the circuit breaker ZK3, the other end of the second connection of the circuit breaker ZK3 is connected to the other end of the detection end of the undervoltage relay QY and the other end of the detection end of the overvoltage relay GY;

[0037] The overvoltage relay GY and the undervoltage relay QY are configured such that when the primary side of the high-voltage control transformer T1 is connected to a first high voltage, the overvoltage relay GY is activated but the undervoltage relay QY is not activated, and when the primary side of the high-voltage control transformer T1 is connected to a second high voltage, the overvoltage relay GY is not activated but the undervoltage relay QY is activated; the first high voltage is greater than the second voltage; in this embodiment, the first high voltage is 10 kV and the second high voltage is 6 kV;

[0038] The first output terminal of the first self-powered power supply circuit is connected to one end of the first connection of the switch QF1 in the dual power supply switching device U1; the second output terminal of the first self-powered power supply circuit is connected to one end of the second connection of the switch QF1 in the dual power supply switching device U1;

[0039] The first output terminal of the second self-power supply circuit is connected to one end of the first connection of the switch QF2 in the dual power supply switching device U1; the second output terminal of the second self-power supply circuit is connected to one end of the second connection of the switch QF2 in the dual power supply switching device U1;

[0040] The other end of the first connection of the switch QF1 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF1 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2;

[0041] The other end of the first connection of the switch QF2 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF2 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2;

[0042] The first output terminal of the external power supply circuit is connected to one end of the first connection of the switch QF4 in the dual power supply switching device U2; the second output terminal of the external power supply circuit is connected to one end of the second connection of the switch QF4 in the dual power supply switching device U2;

[0043] The other end of the first connection of the switch QF3 in the dual power switching device U2 and the other end of the first connection of the switch QF4 are connected and serve as the first power supply end of the power-consuming equipment;

[0044] The other end of the second connection of the switch QF3 in the dual power switching device U2 is connected to the other end of the second connection of the switch QF4 and serves as the second power supply end of the power-consuming equipment;

[0045] The first power supply end and the second power supply end of the electric equipment can provide 220V voltage to specific electric equipment, and the electric equipment includes an electric chassis vehicle, an electric grounding knife, an LCD screen, a cabinet heater, etc.;

[0046] Specifically, the external power supply circuit includes a circuit breaker ZK6; one end of the first connection and one end of the second connection of the circuit breaker ZK6 are used to connect to the external power supply; the other end of the first connection of the circuit breaker ZK6 is connected to one end of the first connection of the switch QF4 in the dual power switching device U2 as the first output end of the external power supply circuit; the other end of the second connection of the circuit breaker ZK6 is connected to one end of the second connection of the switch QF4 in the dual power switching device U2 as the second output end of the external power supply circuit;

[0047] Furthermore, the secondary power supply circuit for the double-circuit incoming line of the flameproof high-voltage combined distribution device also includes a dual power switching device display XSQ, and the dual power switching device display XSQ is respectively connected to the dual power switching device U1 and the dual power switching device U2.

[0048] The working principle of this embodiment is as follows: the dual power switching device U1 can be configured to close the switch QF1 by default, and automatically close the switch QF2 when it is detected that the switch QF1 loses power; the dual power switching device U2 can be configured to close the switch QF3 by default, and automatically close the switch QF4 when it is detected that the switch QF3 loses power;

[0049] Normally, the I section busbar supplies power; when the primary side high voltage of the first self-powered power supply circuit is 10kv, the overvoltage relay GY is energized, at which time the normally open contact GY-2 of the overvoltage relay GY is closed, and the normally closed contact GY-1 is disconnected, and the middle tap of the secondary side of the high-voltage control transformer T1 outputs a 220v voltage to the dual power supply switching device U1; when the primary side high voltage is switched from 10kv to 6kv, the undervoltage relay QY is energized, at which time the normally open contact QY-1 of the undervoltage relay QY is closed, and the normally closed contact QY-2 is disconnected, and the main winding of the high-voltage control transformer T1 outputs a 220v voltage to the dual power supply switching device U1;

[0050] When the I section bus is powered off due to maintenance or failure and the II section bus is powered on, the dual power switching device U1 automatically switches to the switch QF2 closed; automatically ensuring the 220V voltage supply on the secondary side;

[0051] When both bus sections I and II are de-energized due to maintenance or failure, the dual power switching device U2 automatically switches to switch QF4 to close, and power can be supplied to the electrical equipment on the secondary side through the external power supply.

[0052] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A secondary power supply circuit for double-circuit incoming lines of a flameproof high-voltage combined power distribution device, characterized in that: It includes a first self-power supply circuit, a second self-power supply circuit, an external power supply circuit, a dual power supply switching device U1, and a dual power supply switching device U2; The first self-power supply circuit is the same as the second self-power supply circuit, including: a high-voltage control transformer T1, a secondary side main switch S1, circuit breakers ZK0, ZK1, ZK2, ZK3, an overvoltage relay GY, and an undervoltage relay QY; The primary side of the high-voltage control transformer T1 is used to connect the primary side high voltage; the secondary side of the high-voltage control transformer T1 includes a main winding and an auxiliary winding; wherein the main winding is provided with an intermediate tap; One end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the first link of the secondary side main switch S1, the other end of the first link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK0, the other end of the circuit breaker ZK0 is connected to one end of the normally open contact QY-1 of the undervoltage relay QY, the other end of the normally open contact QY-1 of the undervoltage relay QY is connected to one end of the normally closed contact GY-1 of the overvoltage relay GY, and the other end of the normally closed contact GY-1 of the overvoltage relay GY serves as the first output end of the self-power supply circuit; One end of the middle tap on the secondary side of the high-voltage control transformer T1 is connected to one end of the second link of the secondary side main switch S1, the other end of the second link of the secondary side main switch S1 is connected to one end of the circuit breaker ZK1, the other end of the circuit breaker ZK1 is connected to one end of the power supply end of the undervoltage relay QY, one end of the power supply end of the overvoltage relay GY and one end of the normally closed contact QY-2 of the undervoltage relay QY, the normally closed contact QY-2 of the undervoltage relay QY is connected to one end of the normally open contact GY-2 of the overvoltage relay GY, and the other end of the normally open contact GY-2 of the overvoltage relay GY is connected to the first output end of the self-power supply circuit; The other end of the secondary side main winding of the high voltage control transformer T1 is connected to one end of the third connection of the secondary side main switch S1, the other end of the third connection of the secondary side main switch S1 is connected to one end of the circuit breaker ZK2, the other end of the circuit breaker ZK2 is connected to the other end of the power supply end of the undervoltage relay QY and the other end of the power supply end of the overvoltage relay GY, and serves as the second output end of the self-power supply circuit; One end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fourth link of the secondary side main switch S1, the other end of the fourth link of the secondary side main switch S1 is connected to one end of the first link of the circuit breaker ZK3, the other end of the first link of the circuit breaker ZK3 is connected to one end of the detection end of the undervoltage relay QY and one end of the detection end of the overvoltage relay GY; The other end of the secondary side auxiliary winding of the high voltage control transformer T1 is connected to one end of the fifth connection of the secondary side main switch S1, the other end of the fifth connection of the secondary side main switch S1 is connected to one end of the second connection of the circuit breaker ZK3, the other end of the second connection of the circuit breaker ZK3 is connected to the other end of the detection end of the undervoltage relay QY and the other end of the detection end of the overvoltage relay GY; The overvoltage relay GY and the undervoltage relay QY are configured such that when the primary side of the high-voltage control transformer T1 is connected to the first high voltage, the overvoltage relay GY is activated but the undervoltage relay QY is not activated, and when the primary side of the high-voltage control transformer T1 is connected to the second high voltage, the overvoltage relay GY is not activated but the undervoltage relay QY is activated; the first high voltage is greater than the second voltage; The first output terminal of the first self-powered power supply circuit is connected to one end of the first connection of the switch QF1 in the dual power supply switching device U1; the second output terminal of the first self-powered power supply circuit is connected to one end of the second connection of the switch QF1 in the dual power supply switching device U1; The first output terminal of the second self-power supply circuit is connected to one end of the first connection of the switch QF2 in the dual power supply switching device U1; the second output terminal of the second self-power supply circuit is connected to one end of the second connection of the switch QF2 in the dual power supply switching device U1; The other end of the first connection of the switch QF1 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF1 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2; The other end of the first connection of the switch QF2 in the dual power switching device U1 is connected to one end of the first connection of the switch QF3 in the dual power switching device U2; the other end of the second connection of the switch QF2 in the dual power switching device U1 is connected to one end of the second connection of the switch QF3 in the dual power switching device U2; The first output terminal of the external power supply circuit is connected to one end of the first connection of the switch QF4 in the dual power supply switching device U2; the second output terminal of the external power supply circuit is connected to one end of the second connection of the switch QF4 in the dual power supply switching device U2; The other end of the first connection of the switch QF3 in the dual power switching device U2 and the other end of the first connection of the switch QF4 are connected and serve as the first power supply end of the power-consuming equipment; The other end of the second connection of the switch QF3 in the dual power switching device U2 and the other end of the second connection of the switch QF4 are connected and serve as the second power supply end of the electrical equipment.

2. The secondary power supply circuit for double-circuit incoming lines of a flameproof high-voltage combined power distribution device according to claim 1, characterized in that: The external power supply circuit includes a circuit breaker ZK6; one end of the first connection and one end of the second connection of the circuit breaker ZK6 are used to connect to the external power supply; the other end of the first connection of the circuit breaker ZK6 is connected to one end of the first connection of the switch QF4 in the dual power switching device U2 as the first output end of the external power supply circuit; the other end of the second connection of the circuit breaker ZK6 is connected to one end of the second connection of the switch QF4 in the dual power switching device U2 as the second output end of the external power supply circuit.

3. The secondary power supply circuit for double-circuit incoming lines of a flameproof high-voltage combined power distribution device according to claim 1, characterized in that: The secondary power supply circuit for the double-circuit incoming line of the flameproof high-voltage combined power distribution device also includes a dual power switching device display XSQ, and the dual power switching device display XSQ is respectively connected to the dual power switching device U1 and the dual power switching device U2.

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