CN201450257U - A 20kV/10kV drop-0.4kV box-type contact substation - Google Patents

Abstract

The utility model discloses a 20kV/10kV drop-0.4kV box-type contact substation, its high-voltage chamber (2) is a 20kV high-voltage chamber or a 10kV high-voltage chamber, and is located between the high-voltage chamber (2) and the 0.4kV low-voltage chamber (3). There is a transformer room (4) equipped with a step-down transformer (5), the primary side of the step-down transformer (5) is provided with a 20kV input tap and a 10kV input tap, and there is a 20kV incoming line terminal or a 10kV The incoming line terminal (6), busbar I (7), switch I (8) and fuse (9), the 20kV incoming line terminal or 10kV incoming line terminal (6) passes the incoming cable (10), busbar I (7) be connected with the input end of switch I (8), the output end of switch I (8) is connected with the input end of fuse (9), the output end of fuse (9) is connected with the primary of step-down transformer (5) end connection.

Description

A 20kV/10kV drop-0.4kV box-type contact substation

technical field

The utility model relates to a 20kV/10kV drop-0.4kV box-type contact substation.

Background technique

With the rapid development of power grid construction, 20kV power grids are currently being built in many areas, but the current 20kV power grids are newly built 0.4kV users powered by 10kV power grids. In the construction of 20kV power grids, 20kV power grid equipment needs to be rebuilt, which not only needs to be repeated The cost of investment and use is high, and it causes unnecessary waste to power equipment.

Contents of the invention

The utility model provides a 20kV/10kV drop-0.4kV box-type contact substation, which not only has small investment and low cost, avoids repeated investment, but also can improve the power supply capacity and adaptability of the power system.

The utility model adopts the following technical solutions: a box-type contact substation with 20kV/10kV drop of 0.4kV, which includes a box body, and the box body is provided with a high-voltage chamber and a 0.4kV low-voltage chamber, and the high-voltage chamber is a 20kV high-voltage chamber Or 10kV high-voltage room, there is a transformer room between the high-voltage room and the 0.4kV low-voltage room, the transformer room is equipped with a step-down transformer, the neutral point of the step-down transformer is grounded, and the primary side of the step-down transformer is provided with a 20kV input tap and a 10kV Input tap, there are 20kV incoming line terminal or 10kV incoming line terminal, busbar I, switch I and fuse in the high-voltage chamber, and the 20kV incoming line terminal or 10kV incoming line terminal passes through the incoming cable, busbar I and switch I input terminals in turn Connection, the output end of the switch I is connected to the input end of the fuse, and the output end of the fuse is connected to the primary end of the step-down transformer. When the input is 10kV, the output end of the fuse is connected to the 10kV input tap of the step-down transformer. When inputting 20kV, connect the 20kV input tap and the 10kV input tap in series to the output end of the fuse. The 0.4kV low-voltage chamber includes switch II and busbar II. The secondary end of the step-down transformer passes through switch II, busbar II and Several load circuits are connected, and the load circuits are connected in parallel with each other.

The 20kV incoming line end or the 10kV incoming line end are connected in parallel with a lightning arrester and a live display I. The busbar I and the busbar II are connected with voltage transformers. A current transformer IV and a charged indicator II are connected between the fuse and the primary end of the step-down transformer. The fuse is connected in series with the current transformer IV and then connected in parallel with the charged indicator II. One end of the charged indicator II is connected to a cable through a capacitor. The other end is grounded. A current transformer III is connected in series between the switch II and the busbar II. The load circuit includes a single load circuit and a multi-load circuit. The single-load circuit and the multi-load circuit are connected in parallel with each other and connected in series with the busbar II. The single-load circuit includes a disconnector I, a circuit breaker I and a current transformer I, and the disconnector I , circuit breaker I and current transformer I are connected in series, the multi-load circuit includes isolating switch II, several circuit breakers II and several current transformers II, each circuit breaker II and circuit transformer II are connected in series to form a branch circuit, each branch The circuits are connected in parallel with each other and then connected in series with the isolating switch II. The load circuit also includes a capacitor compensation cabinet. The capacitor compensation cabinet can be a single-phase capacitor compensation cabinet, a three-phase capacitor compensation cabinet and a hybrid capacitor compensation cabinet. in series. The switch I is a load switch, and the load switch is grounded through a grounding switch. The switch II is a circuit breaker II, and the circuit breaker II is a fixed circuit breaker or a drawer type circuit breaker. The transformer room is equipped with a temperature control system, the temperature control system includes a temperature sensor, a controller and a fan, the temperature sensor is connected with the controller and the fan in turn, the temperature sensor detects the temperature signal and transmits the signal to the controller, and the controller sends the signal to the controller according to the signal. To control the operation of the fan, there are ventilation channels at the top and bottom of the transformer room.

The utility model has the following beneficial effects: after adopting the above technical scheme, the transformer of the utility model has double taps on the primary end of the transformer, which can realize the requirements of different input voltage levels before and after the transition of the 10kV and 20kV power grids, and ensure that the 0.4kV users The transition from 10kV power supply to 20kV power supply without secondary investment is not only small investment, low cost, avoiding repeated investment, but also can improve the power supply capacity and adaptability of the power system. The utility model places a 0.4kV low-voltage chamber, a high-voltage chamber and a step-down transformer in the box body. It has the characteristics of compact structure, small volume, light weight, high strength, etc., and is convenient for transportation and on-site installation. The vehicle is transported to the required area for installation, and at the same time, its cost is greatly reduced compared with the construction of large-scale substations, which meets the needs of small and medium areas. The busbar I and the busbar II11 of the utility model are respectively connected with voltage transformers, and the voltage transformers can provide power supply for operation, test and protection devices and sampling voltage for the protection devices. The switch II of the utility model is a circuit breaker II, which can implement three-stage overcurrent protection, zero sequence protection, etc. for the circuit, and has three remote functions. The circuit breaker II is connected in series with a current transformer, and the current transformer can control the Current measurement and metering of the circuit and the addition of protection devices. The 20kV high-voltage chamber of the utility model is equipped with a load switch I, which can implement three-stage overcurrent protection for the transformer. The bottom of the box body of the utility model is provided with a heater. When the equipment generates condensation due to temperature difference, the heater can be automatically started to adjust the temperature difference and remove condensation. The busbar II of the utility model can be connected with multiple rows of load circuits, so that it can be expanded in multiple ways according to the requirements of the load capacity. The utility model is equipped with a capacitor compensation cabinet, which detects the power supply quality of the low-voltage system in real time, and compensates the reactive power to improve the power supply quality; the one-time scheme of the compensation cabinet can be designed as single-phase compensation, three-phase compensation, mixed compensation, etc. according to user requirements The compensation method has a wide range of applications.

Description of drawings

Fig. 1 is the structural representation of the utility model

Fig. 2 is the outline drawing of the utility model

Fig. 3 is the distribution diagram of the 0.4kV low-voltage chamber, high-voltage chamber and step-down transformer of the present utility model

Detailed ways

In Figure 1, Figure 2 and Figure 3, the utility model is a 20kV/10kV drop 0.4kV box-type contact substation, which includes a box body 1, and the box body 1 is equipped with a high-voltage chamber 2 and a 0.4kV low-voltage chamber 3 , the high-voltage chamber 2 is a 20kV high-voltage chamber or a 10kV high-voltage chamber, and a transformer room 4 is provided between the high-voltage chamber 2 and the 0.4kV low-voltage chamber 3, and a step-down transformer 5 is provided in the transformer room 4, and the neutral point of the step-down transformer 5 Grounded, the primary end of the step-down transformer 5 is provided with 20kV input taps and 10kV input taps, the high voltage chamber 2 has 20kV incoming line terminal or 10kV incoming line end 6, busbar I7, switch I8 and fuse 9, switch I8 is the load switch, the load switch is grounded through the grounding switch, the 20kV incoming line terminal or the 10kV incoming line terminal 6 are connected in parallel with the lightning arrester 13 and the live display I14, the 20kV incoming line terminal or the 10kV incoming line terminal 6 passes through the incoming cable 10, busbar I7 and The input end of switch I8 is connected, and the output end of switch I8 is connected with the input end of fuse 9, and the output end of fuse 9 is connected with the primary end of step-down transformer 5, between fuse 9 and the primary end of step-down transformer 5 There are current transformer IV29 and electrified indicator II15 connected between them, fuse 9 is connected in series with current transformer IV29 and then connected in parallel with electrified indicator II15, one end of electrified indicator II15 is connected to the cable through a capacitor, and the other end is grounded. When inputting 10kV, the fuse The output terminal of 9 is connected to the 10kV input tap of the step-down transformer 5. When inputting 20kV, the 20kV input tap and the 10kV input tap are connected in series to the output terminal of the fuse 9. The 0.4kV low voltage chamber 3 includes switch II11 and busbar II12, the switch II11 is the circuit breaker II, the circuit breaker II is a fixed circuit breaker or a drawer type circuit breaker, the secondary end of the step-down transformer 5 is connected to several load circuits through the switch II11 and the busbar II12 in turn, and the switch II11 is connected to the busbar There is a current transformer III16 in series between II12, and the load circuits are connected in parallel with each other. A voltage transformer is connected to the busbar I7 and the busbar II12. The load circuit includes a single load circuit and multiple load circuits, and the single load circuit and multiple load circuits are mutually connected. After parallel connection, it is connected in series with busbar II12. The single load circuit includes isolating switch I17, circuit breaker I18 and current transformer I19. The isolating switch I17, circuit breaker I18 and current transformer I19 are connected in series. Circuit breaker II21 and three current transformers II22, each circuit breaker II21 and circuit transformer II22 are connected in series to each other to form a branch circuit, and the three branches are connected in parallel to each other and then connected in series with the isolation switch II20, the load circuit also includes a capacitance compensation cabinet, capacitance compensation The cabinet is a three-phase capacitor compensation cabinet. The three-phase capacitor compensation cabinet includes an isolating switch III23, a current transformer 24, a fuse 25, a contactor 26, a thermal relay 27 and a three-phase compensation capacitor 28. The isolating switch III23 is connected with the current transformer 24 in turn. , fuse 25, contactor 26, thermal relay 27 and the three-phase compensation capacitor 28 are connected in series, the compensation cabinet is connected in parallel with the single-load circuit and multi-load circuit and then connected in series with the busbar II, and a temperature control system is installed in the transformer room 4, the temperature control system includes a temperature sensor, a controller and a fan, The temperature sensor is connected with the controller and the fan in turn. The temperature sensor detects the temperature signal and transmits the signal to the controller. The controller controls the fan to work according to the signal. There are ventilation channels at the top and bottom of the transformer room 4, and the capacitance compensation cabinet can also be used It is a single-phase capacitor compensation cabinet and a hybrid capacitor compensation cabinet.

Claims (10)

1. A 20kV/10kV drop-0.4kV box-type contact substation, which includes a box (1), is characterized in that the box (1) is provided with a high-voltage chamber (2) and a 0.4kV low-voltage chamber (3 ), the high-voltage chamber (2) is a 20kV high-voltage chamber or a 10kV high-voltage chamber, a transformer chamber (4) is provided between the high-voltage chamber (2) and a 0.4kV low-voltage chamber (3), and a step-down The transformer (5), the neutral point of the step-down transformer (5) is grounded, the primary end of the step-down transformer (5) is provided with a 20kV input tap and a 10kV input tap, and there is a 20kV input terminal or a 10kV input tap in the high voltage chamber (2). Line terminal (6), busbar I (7), switch I (8) and fuse (9), 20kV incoming line terminal or 10kV incoming line terminal (6) passes through incoming cable (10), busbar I ( 7) be connected with the input end of switch I (8), the output end of switch I (8) is connected with the input end of fuse (9), the output end of fuse (9) is connected with the primary end of step-down transformer (5) Connection, when inputting 10kV, the output end of fuse (9) is connected with the 10kV input tap of step-down transformer (5), when inputting 20kV, after 20kV input tap and 10kV input tap are connected in series with fuse (9) The output end is connected, the 0.4kV low-voltage room includes switch II (11) and busbar II (12), and the secondary end of the step-down transformer (5) passes through switch II (11), busbar II (12) and several load circuits in turn connection, the load circuits are connected in parallel with each other. 2. 20kV/10kV drop 0.4kV box-type contact substation according to claim 1, it is characterized in that described 20kV incoming line end or 10kV incoming line end place is connected in parallel with surge arrester (13) and charged indicator I (14) . 3. The 20kV/10kV drop-0.4kV box-type substation according to claim 1, characterized in that said busbar I (7) and busbar II (12) are connected with voltage transformers. 4. The 20kV/10kV drop-0.4kV box-type substation according to claim 1 is characterized in that a current transformer IV ( 29) and charged display II (15), fuse (9) and current transformer IV (29) are connected in parallel with charged display II (15) after series connection, charged display II (15) one end is connected with cable by electric capacity, the other end grounded. 5. The 20kV/10kV drop-0.4kV box-type tie substation according to claim 1, characterized in that a current transformer III (16) is connected in series between the switch II (11) and the busbar II (12) . 6. The 20kV/10kV drop-0.4kV box-type tie substation according to claim 1, characterized in that the load circuit includes a single load circuit and a multi-load circuit, and the single-load circuit and the multi-load circuit are connected in parallel with each other and connected in series with the busbar II , the single load circuit includes an isolating switch I (17), a circuit breaker I (18) and a current transformer I (19), and the isolating switch I (17), the circuit breaker I (18) and the current transformer I (19) are connected in series , the multi-load circuit includes a disconnector II (20), several circuit breakers II (21) and several current transformers II (22), and each circuit breaker II (21) is connected in series with the circuit transformer II (22) to form a branch Each branch is connected in parallel with each other and connected in series with the isolating switch II (20). 7. The 20kV/10kV drop-0.4kV box-type contact substation according to claim 6, characterized in that the load circuit also includes a capacitor compensation cabinet, and the capacitor compensation cabinet can be a single-phase capacitor compensation cabinet or a three-phase capacitor compensation cabinet. Cabinet and hybrid capacitor compensation cabinet, the capacitor compensation cabinet is connected in parallel with single load circuit and multi-load circuit and then connected in series with busbar II. 8. 20kV/10kV drop 0.4kV box type tie substation according to claim 1, is characterized in that described switch I (8) is a load switch, and the load switch is grounded through a grounding switch. 9. The 20kV/10kV drop-0.4kV box-type contact substation according to claim 1 or 5, characterized in that the switch II (11) is a circuit breaker II, and the circuit breaker II is a fixed circuit breaker or a drawer type breaker. 10. The 20kV/10kV drop-0.4kV box-type substation according to claim 1, characterized in that the transformer room (4) is provided with a temperature control system, the temperature control system includes a temperature sensor, a controller and The fan and the temperature sensor are connected with the controller and the fan in turn. The temperature sensor detects the temperature signal and transmits the signal to the controller. The controller controls the fan to work according to the signal. Ventilation passages are respectively arranged at the top and bottom of the transformer room (4).

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