CN219717938U - Secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment - Google Patents
Secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment Download PDFInfo
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- CN219717938U CN219717938U CN202320736240.2U CN202320736240U CN219717938U CN 219717938 U CN219717938 U CN 219717938U CN 202320736240 U CN202320736240 U CN 202320736240U CN 219717938 U CN219717938 U CN 219717938U
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Abstract
The utility model provides a secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment, which comprises: the transformer T1, a secondary side main switch S1, a switching power supply U1, an overvoltage relay GY, an undervoltage relay QY, contactors KM1 and KM2, circuit breakers ZK1, ZK2, ZK3, ZK4 and ZK5, a relay KA1, a UPS power supply module UPS1 and a rechargeable battery module BT1; the primary side of the transformer T1 is used for connecting primary side alternating current voltage; the secondary of the transformer T1 comprises a first winding and a second winding; when the primary side voltage is changed at 1140v or 660v, the secondary side can be automatically switched to keep the voltage at 220v, and meanwhile, the secondary side has uninterrupted power supply capacity within a certain time, so that the uninterrupted power supply requirement of part of important electric equipment is met.
Description
Technical Field
The utility model relates to a secondary power supply system, in particular to a secondary power supply system in low-voltage combined feed equipment.
Background
The flameproof and intrinsically safe low-voltage combined feed equipment is important power supply equipment in various mines, and can convert 1140v or 660v primary side alternating current into 220v alternating current and then supply power to electric equipment;
in the current low-voltage combined feed equipment, when the alternating current voltage of the primary side changes, the alternating current voltage of the secondary side also changes, for example, the alternating current voltage is changed from 220v to 127v; thus, for many electric equipment needing 220v alternating current, different low-voltage combined feed equipment needs to be customized according to the use environment of 1140v or 660v;
in addition, when primary side voltage is interrupted, secondary side voltage interruption can be caused, and all secondary side electric equipment can be powered off, so that the power supply requirement of underground intelligent equipment can not be met.
Disclosure of Invention
Aiming at the defects existing in the prior art, the embodiment of the utility model provides a secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment, when the alternating current voltage of a primary side is changed at 1140v or 660v, the secondary side can be automatically switched to keep the voltage at 220v, and meanwhile, the secondary side has uninterrupted power supply capability within a certain time, so that the uninterrupted power supply requirement of part of important electric equipment is met. In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the utility model is as follows:
the embodiment of the utility model provides a secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment, which comprises the following components: the transformer T1, a secondary side main switch S1, a switching power supply U1, an overvoltage relay GY, an undervoltage relay QY, contactors KM1 and KM2, circuit breakers ZK1, ZK2, ZK3, ZK4 and ZK5, a relay KA1, a UPS power supply module UPS1 and a rechargeable battery module BT1;
the primary side of the transformer T1 is used for connecting primary side alternating current voltage;
the secondary of the transformer T1 comprises a first winding and a second winding; wherein the first winding is provided with a center tap;
one end of a secondary first winding of the transformer T1 is connected with a first connection end of a secondary side main switch S1, the other end of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK1, the other end of the first connection of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-1 of a contactor KM2, and the other end of the normally open contact KM2-1 of the contactor KM2 is connected with one end of a normally closed contact KM1-1 of the contactor KM 1;
the middle tap of the secondary first winding of the transformer T1 is connected with the second joint end of the secondary side main switch S1, the other end of the second joint of the secondary side main switch S1 is connected with the first joint end of the breaker ZK2, the other end of the first joint of the breaker ZK2 is connected with one end of a normally-closed contact KM2-3 of the contactor KM2, and the other end of the normally-closed contact KM2-3 of the contactor KM2 is connected with one end of a normally-open contact KM1-3 of the contactor KM 1;
the other end of the secondary first winding of the transformer T1 is connected with the third joint end of the secondary side main switch S1, and the other end of the third joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK1 and the second joint end of the breaker ZK 2; the other end of the second coupling of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-2 of the contactor KM2, and the other end of the normally open contact KM2-2 of the contactor KM2 is connected with one end of a normally closed contact KM1-2 of the contactor KM 1; the other end of the second coupling of the circuit breaker ZK2 is connected with one end of a normally-closed contact KM2-4 of the contactor KM2, and the other end of the normally-closed contact KM2-4 of the contactor KM2 is connected with one end of a normally-open contact KM1-4 of the contactor KM 1;
the other end of the normally-closed contact KM1-1 of the contactor KM1 is connected with the other end of the normally-open contact KM1-3 of the contactor KM1, one end of a coil of the relay KA1, one end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-1 of the relay KA1 and one first connecting end of the breaker ZK5;
the other end of the normally-closed contact KM1-2 of the contactor KM1 is connected with the other end of the normally-open contact KM1-4 of the contactor KM1, the other end of the relay coil KA1, the other end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-2 of the relay KA1 and the second joint end of the breaker ZK5;
one end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-3 of a relay KA1, the other end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-4 of the relay KA1, the other end of the normally-open contact KA1-1 of the relay KA1 is connected with the other end of the normally-closed contact KA1-3 of the relay KA1 and the first joint end of a circuit breaker ZK4, and the other end of the normally-closed contact KA1-2 of the relay KA1 is connected with the second joint end of the circuit breaker ZK 4;
the other end of the first link and the other end of the second link of the breaker ZK4 are used for connecting electric equipment needing UPS protection; the other end of the first link and the other end of the second link of the breaker ZK5 are used for connecting electric equipment which does not need UPS protection;
the battery side of the UPS power supply module UPS1 is connected with a rechargeable battery module BT1;
one end of a secondary second winding of the transformer T1 is connected with a fourth connection end of a secondary side main switch S1, the other end of the fourth connection of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK3, and the other end of the first connection of the circuit breaker ZK3 is connected with one end of an undervoltage relay QY and one end of an overvoltage relay GY; the other end of the secondary second winding of the transformer T1 is connected with the fifth joint end of the secondary side main switch S1, the other end of the fifth joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK3, and the other end of the second joint of the breaker ZK3 is connected with the other end of the undervoltage relay QY and the other end of the overvoltage relay GY;
the two ends of the input side of the switching power supply U1 are respectively connected with the other end of the first link and the other end of the second link of the circuit breaker ZK 2;
the overvoltage relay GY and the undervoltage relay QY are configured such that when the primary of the transformer T1 is connected with a first high voltage, the overvoltage relay GY is attracted but the undervoltage relay QY is not attracted, and when the primary of the transformer T1 is connected with a second high voltage, the overvoltage relay GY is not attracted but the undervoltage relay QY is attracted; the first high voltage is greater than the second high voltage;
the direct current output end of the switching power supply U1 is connected with one end of a coil of the contactor KM1 and one end of a coil of the contactor KM2, the other end of the coil of the contactor KKM1 is connected with one end of a normally open contact GY-1 of an overvoltage relay GY through a normally closed contact QY-1 of an undervoltage relay QY, the other end of the coil of the contactor KM2 is connected with one end of a normally open contact QY-2 of the undervoltage relay GY through a normally closed contact GY-2 of the overvoltage relay GY, and the other ends of the normally open contact GY-1 of the overvoltage relay and the normally open contact QY-2 of the undervoltage relay GY are connected with a public end of the switching power supply U1.
Further, the secondary first winding of the transformer T1 outputs 220v voltage when the primary side alternating current voltage of the transformer T1 is 660v, and the middle tap outputs 220v voltage when the primary side alternating current voltage of the transformer T1 is 1140 v.
Further, the first high voltage is 1140v, and the second high voltage is 660v.
Further, the action switching voltages of the overvoltage relay GY and the undervoltage relay QY are both set between 30v and 35 v; the operation switching voltage of the overvoltage relay GY is higher than the operation switching voltage of the undervoltage relay QY.
The technical scheme provided by the embodiment of the utility model has the beneficial effects that:
1) The conversion of the primary side alternating current voltage can be automatically adapted, and the secondary side output voltage is kept at 220v.
2) When the primary side power supply is problematic, the primary side power supply can be automatically switched to uninterrupted power supply, and the uninterrupted power supply of important equipment is ensured.
Drawings
Fig. 1 is a schematic diagram of a secondary power supply system according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1, a secondary power supply system (hereinafter referred to as secondary power supply system) in an explosion-proof and intrinsic safety type low-voltage combined power supply device according to an embodiment of the present utility model includes: the transformer T1, a secondary side main switch S1, a switching power supply U1, an overvoltage relay GY, an undervoltage relay QY, contactors KM1 and KM2, circuit breakers ZK1, ZK2, ZK3, ZK4 and ZK5, a relay KA1, a UPS power supply module UPS1 and a rechargeable battery module BT1;
the primary side of the transformer T1 is used for connecting primary side alternating current voltage; in an embodiment of the present utility model, the primary side alternating current voltage may be 1140v or 660v;
the secondary of the transformer T1 comprises a first winding and a second winding; wherein the first winding is provided with a center tap; the primary winding of the transformer T1 can output 220v voltage when the primary side alternating current voltage of the transformer T1 is 660v, and the middle tap can output 220v voltage when the primary side alternating current voltage of the transformer T1 is 1140 v;
one end of a secondary first winding of the transformer T1 is connected with a first connection end of a secondary side main switch S1, the other end of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK1, the other end of the first connection of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-1 of a contactor KM2, and the other end of the normally open contact KM2-1 of the contactor KM2 is connected with one end of a normally closed contact KM1-1 of the contactor KM 1;
the middle tap of the secondary first winding of the transformer T1 is connected with the second joint end of the secondary side main switch S1, the other end of the second joint of the secondary side main switch S1 is connected with the first joint end of the breaker ZK2, the other end of the first joint of the breaker ZK2 is connected with one end of a normally-closed contact KM2-3 of the contactor KM2, and the other end of the normally-closed contact KM2-3 of the contactor KM2 is connected with one end of a normally-open contact KM1-3 of the contactor KM 1;
the other end of the secondary first winding of the transformer T1 is connected with the third joint end of the secondary side main switch S1, and the other end of the third joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK1 and the second joint end of the breaker ZK 2; the other end of the second coupling of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-2 of the contactor KM2, and the other end of the normally open contact KM2-2 of the contactor KM2 is connected with one end of a normally closed contact KM1-2 of the contactor KM 1; the other end of the second coupling of the circuit breaker ZK2 is connected with one end of a normally-closed contact KM2-4 of the contactor KM2, and the other end of the normally-closed contact KM2-4 of the contactor KM2 is connected with one end of a normally-open contact KM1-4 of the contactor KM 1;
the other end of the normally-closed contact KM1-1 of the contactor KM1 is connected with the other end of the normally-open contact KM1-3 of the contactor KM1, one end of a coil of the relay KA1, one end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-1 of the relay KA1 and one first connecting end of the breaker ZK5;
the other end of the normally-closed contact KM1-2 of the contactor KM1 is connected with the other end of the normally-open contact KM1-4 of the contactor KM1, the other end of the relay coil KA1, the other end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-2 of the relay KA1 and the second joint end of the breaker ZK5;
one end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-3 of a relay KA1, the other end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-4 of the relay KA1, the other end of the normally-open contact KA1-1 of the relay KA1 is connected with the other end of the normally-closed contact KA1-3 of the relay KA1 and the first joint end of a circuit breaker ZK4, and the other end of the normally-closed contact KA1-2 of the relay KA1 is connected with the second joint end of the circuit breaker ZK 4;
the other end of the first link and the other end of the second link of the breaker ZK4 are used for connecting electric equipment needing UPS protection; the other end of the first link and the other end of the second link of the breaker ZK5 are used for connecting electric equipment which does not need UPS protection;
the battery side of the UPS power supply module UPS1 is connected with a rechargeable battery module BT1; in this embodiment, the rechargeable battery module BT1 employs a lithium battery, and the design capacity is to provide 4 hours of standby power;
one end of a secondary second winding of the transformer T1 is connected with a fourth connection end of a secondary side main switch S1, the other end of the fourth connection of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK3, and the other end of the first connection of the circuit breaker ZK3 is connected with one end of an undervoltage relay QY and one end of an overvoltage relay GY; the other end of the secondary second winding of the transformer T1 is connected with the fifth joint end of the secondary side main switch S1, the other end of the fifth joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK3, and the other end of the second joint of the breaker ZK3 is connected with the other end of the undervoltage relay QY and the other end of the overvoltage relay GY;
the two ends of the input side of the switching power supply U1 are respectively connected with the other end of the first link and the other end of the second link of the circuit breaker ZK 2; the switching power supply U1 has a wider voltage input range, the voltage between the middle tap and the other end of the transformer T1 is 220v or 127v when the primary side alternating current voltage is 1140v or 660v, and the switching power supply U1 can work normally;
the overvoltage relay GY and the undervoltage relay QY are configured such that when the primary of the transformer T1 is connected with a first high voltage, the overvoltage relay GY is attracted but the undervoltage relay QY is not attracted, and when the primary of the transformer T1 is connected with a second high voltage, the overvoltage relay GY is not attracted but the undervoltage relay QY is attracted; the first high voltage is greater than the second high voltage; in this embodiment, the first high voltage is 1140v, and the second high voltage is 660v;
in this embodiment, when the primary ac voltage of the primary winding of the transformer T1 is 1140v, the voltage obtained by the secondary winding of the transformer T1 is about 41v, and when the primary ac voltage of the primary winding of the transformer T1 is 660v, the voltage obtained by the secondary winding of the transformer T1 is about 24v; the action conversion voltage of the overvoltage relay GY and the action conversion voltage of the undervoltage relay QY are both set between 30v and 35v, for example, the action conversion voltage of the overvoltage relay GY is set at 35v, when the voltage of the two ends of the overvoltage relay GY is larger than 35v, the action conversion voltage of the overvoltage relay GY is set at 30v, and when the voltage of the two ends of the overvoltage relay GY is lower than 30v, the action conversion voltage of the undervoltage relay QY is absorbed;
the direct current output end of the switching power supply U1 is connected with one end of a coil of the contactor KM1 and one end of a coil of the contactor KM2, the other end of the coil of the contactor KKM1 is connected with one end of a normally open contact GY-1 of an overvoltage relay GY through a normally closed contact QY-1 of an undervoltage relay QY, the other end of the coil of the contactor KM2 is connected with one end of a normally open contact QY-2 of the undervoltage relay QY through a normally closed contact GY-2 of the overvoltage relay GY, and the other end of the normally open contact GY-1 of the overvoltage relay QY and the other end of the normally open contact QY-2 of the undervoltage relay are connected with a public end of the switching power supply U1;
when the secondary power supply system works, the secondary side main switch S1, the circuit breakers ZK1, ZK2, ZK3, ZK4 and ZK5 are closed firstly; when the voltage of the primary side alternating current which is connected in is 1140v, the input voltage of the switching power supply U1 is about 220v, at the moment, the voltage obtained by a secondary winding of the transformer T1 is about 41v, the overvoltage relay GY is attracted but the undervoltage relay QY is not attracted, the overvoltage relay GY normally open contact GY-1 is closed, a coil of the contactor KM1 is electrified, normally open contacts KM1-3 and KM1-4 of the contactor KM1 are closed, and normally closed contacts KM1-1 and KM1-2 are opened; the normally open contacts KM2-1 and KM2-2 of the contactor KM2 are kept normally open, the normally closed contacts KM2-3 and KM2-4 are kept closed, so that the secondary middle tap of the transformer T1 supplies power, the power supply voltage is about 220v, the coil of the relay KA1 is powered, the normally open contacts KA1-1 and KA1-2 of the relay KA1 are closed, the normally closed contacts KA1-3 and KA1-4 are disconnected, the secondary middle tap of the transformer T1 supplies power to electric equipment connected to the downstream of the circuit breaker ZK4 and the downstream of the circuit breaker ZK5, and meanwhile the UPS power supply module UPS1 can charge the rechargeable battery module BT1;
when the primary side alternating current voltage is 660v, the input voltage of the switching power supply U1 is about 127v and can work, the voltage obtained by the secondary second winding of the transformer T1 is about 24v, the overvoltage relay GY is not attracted but the undervoltage relay QY is attracted, the undervoltage relay QY normally open contact QY-2 is closed, the coil of the contactor KM2 is powered, normally open contacts KM2-1 and KM2-2 are closed, normally closed contacts KM2-3 and KM2-4 are opened, normally closed contacts KM1-1 and KM1-2 of the contactor KM1 are kept closed, normally open contacts KM1-3 and KM1-4 are kept normally open, therefore, the primary winding of the secondary of the transformer T1 is powered, the power supply voltage is about 220v, the coil of the relay KA1 is powered, normally open contacts KA1-1 and KA1-2 are closed, normally closed contacts 1-3 and KA1-4 are opened, the primary winding of the transformer T1 supplies power to electric equipment connected to the downstream of the circuit breaker ZK4 and the downstream of the circuit breaker ZK5, and the UPS module BT1 can be charged;
when the primary side alternating current is powered off, the coil of the contactor KA1 is powered off, the normally open contacts KA1-1 and KA1-2 of the contactor KA are opened, the normally closed contacts KA1-3 and KA1-4 are closed, and the UPS power supply module UPS1 supplies power to electric equipment needing UPS protection, so that the uninterrupted power of important equipment is ensured.
The circuit connected with the primary side of the transformer T1 is shown in fig. 1, and comprises a primary side high-voltage isolating switch GL and two fuses FU1 and FU2, wherein the primary side high-voltage isolating switch GL plays a role in isolating and overhauling; this part of the circuit is a conventional circuit and will not be described in detail.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.
Claims (4)
1. The utility model provides a secondary power supply system in flameproof and intrinsic safety type low pressure combination feed equipment which characterized in that includes: the transformer T1, a secondary side main switch S1, a switching power supply U1, an overvoltage relay GY, an undervoltage relay QY, a contactor KM1, a contactor KM2, a breaker ZK1, a breaker ZK2, a breaker ZK3, a breaker ZK4, a breaker ZK5, a relay KA1, a UPS power module UPS1 and a rechargeable battery module BT1;
the primary side of the transformer T1 is used for connecting primary side alternating current voltage;
the secondary of the transformer T1 comprises a first winding and a second winding; wherein the first winding is provided with a center tap;
one end of a secondary first winding of the transformer T1 is connected with a first connection end of a secondary side main switch S1, the other end of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK1, the other end of the first connection of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-1 of a contactor KM2, and the other end of the normally open contact KM2-1 of the contactor KM2 is connected with one end of a normally closed contact KM1-1 of the contactor KM 1;
the middle tap of the secondary first winding of the transformer T1 is connected with the second joint end of the secondary side main switch S1, the other end of the second joint of the secondary side main switch S1 is connected with the first joint end of the breaker ZK2, the other end of the first joint of the breaker ZK2 is connected with one end of a normally-closed contact KM2-3 of the contactor KM2, and the other end of the normally-closed contact KM2-3 of the contactor KM2 is connected with one end of a normally-open contact KM1-3 of the contactor KM 1;
the other end of the secondary first winding of the transformer T1 is connected with the third joint end of the secondary side main switch S1, and the other end of the third joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK1 and the second joint end of the breaker ZK 2; the other end of the second coupling of the circuit breaker ZK1 is connected with one end of a normally open contact KM2-2 of the contactor KM2, and the other end of the normally open contact KM2-2 of the contactor KM2 is connected with one end of a normally closed contact KM1-2 of the contactor KM 1; the other end of the second coupling of the circuit breaker ZK2 is connected with one end of a normally-closed contact KM2-4 of the contactor KM2, and the other end of the normally-closed contact KM2-4 of the contactor KM2 is connected with one end of a normally-open contact KM1-4 of the contactor KM 1;
the other end of the normally-closed contact KM1-1 of the contactor KM1 is connected with the other end of the normally-open contact KM1-3 of the contactor KM1, one end of a coil of the relay KA1, one end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-1 of the relay KA1 and one first connecting end of the breaker ZK5;
the other end of the normally-closed contact KM1-2 of the contactor KM1 is connected with the other end of the normally-open contact KM1-4 of the contactor KM1, the other end of the relay coil KA1, the other end of the input side of the UPS power supply module UPS1, one end of the normally-open contact KA1-2 of the relay KA1 and the second joint end of the breaker ZK5;
one end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-3 of a relay KA1, the other end of the output side of the UPS power supply module UPS1 is connected with one end of a normally-closed contact KA1-4 of the relay KA1, the other end of the normally-open contact KA1-1 of the relay KA1 is connected with the other end of the normally-closed contact KA1-3 of the relay KA1 and the first joint end of a circuit breaker ZK4, and the other end of the normally-closed contact KA1-2 of the relay KA1 is connected with the second joint end of the circuit breaker ZK 4;
the other end of the first link and the other end of the second link of the breaker ZK4 are used for connecting electric equipment needing UPS protection; the other end of the first link and the other end of the second link of the breaker ZK5 are used for connecting electric equipment which does not need UPS protection;
the battery side of the UPS power supply module UPS1 is connected with a rechargeable battery module BT1;
one end of a secondary second winding of the transformer T1 is connected with a fourth connection end of a secondary side main switch S1, the other end of the fourth connection of the secondary side main switch S1 is connected with a first connection end of a circuit breaker ZK3, and the other end of the first connection of the circuit breaker ZK3 is connected with one end of an undervoltage relay QY and one end of an overvoltage relay GY; the other end of the secondary second winding of the transformer T1 is connected with the fifth joint end of the secondary side main switch S1, the other end of the fifth joint of the secondary side main switch S1 is connected with the second joint end of the breaker ZK3, and the other end of the second joint of the breaker ZK3 is connected with the other end of the undervoltage relay QY and the other end of the overvoltage relay GY;
the two ends of the input side of the switching power supply U1 are respectively connected with the other end of the first link and the other end of the second link of the circuit breaker ZK 2;
the overvoltage relay GY and the undervoltage relay QY are configured such that when the primary of the transformer T1 is connected with a first high voltage, the overvoltage relay GY is attracted but the undervoltage relay QY is not attracted, and when the primary of the transformer T1 is connected with a second high voltage, the overvoltage relay GY is not attracted but the undervoltage relay QY is attracted; the first high voltage is greater than the second high voltage;
the direct current output end of the switching power supply U1 is connected with one end of a coil of the contactor KM1 and one end of a coil of the contactor KM2, the other end of the coil of the contactor KKM1 is connected with one end of a normally open contact GY-1 of an overvoltage relay GY through a normally closed contact QY-1 of an undervoltage relay QY, the other end of the coil of the contactor KM2 is connected with one end of a normally open contact QY-2 of the undervoltage relay GY through a normally closed contact GY-2 of the overvoltage relay GY, and the other ends of the normally open contact GY-1 of the overvoltage relay and the normally open contact QY-2 of the undervoltage relay GY are connected with a public end of the switching power supply U1.
2. The secondary power supply system in the flameproof and intrinsically safe low-voltage combined feed device of claim 1, wherein,
the secondary first winding of the transformer T1 outputs 220v voltage when the primary side alternating current voltage of the transformer T1 is 660v, and the middle tap outputs 220v voltage when the primary side alternating current voltage of the transformer T1 is 1140 v.
3. The secondary power supply system in the flameproof and intrinsically safe low-voltage combined feed device of claim 1, wherein,
the first high voltage is 1140v, and the second high voltage is 660v.
4. The secondary power supply system in the flameproof and intrinsically safe low-voltage combined feed device of claim 1, wherein,
the action conversion voltage of the overvoltage relay GY and the undervoltage relay QY is set between 30v and 35 v; the operation switching voltage of the overvoltage relay GY is higher than the operation switching voltage of the undervoltage relay QY.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320736240.2U CN219717938U (en) | 2023-04-06 | 2023-04-06 | Secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320736240.2U CN219717938U (en) | 2023-04-06 | 2023-04-06 | Secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment |
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| CN219717938U true CN219717938U (en) | 2023-09-19 |
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| CN202320736240.2U Active CN219717938U (en) | 2023-04-06 | 2023-04-06 | Secondary power supply system in flameproof and intrinsically safe low-voltage combined feed equipment |
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| CN (1) | CN219717938U (en) |
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