CN211790921U - Automatic switching device for AC/DC universal control power supply of switch cabinet - Google Patents

Automatic switching device for AC/DC universal control power supply of switch cabinet Download PDF

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CN211790921U
CN211790921U CN202020091608.0U CN202020091608U CN211790921U CN 211790921 U CN211790921 U CN 211790921U CN 202020091608 U CN202020091608 U CN 202020091608U CN 211790921 U CN211790921 U CN 211790921U
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control power
power supply
relay
switch cabinet
direct current
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CN202020091608.0U
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汪翔
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Camce Whu Design & Research Co ltd
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Camce Whu Design & Research Co ltd
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Abstract

The utility model relates to a cubical switchboard alternating current-direct current universal control power supply automatic switching device, relay KA 1's coil connects on the looks voltage of AC control power, two normal close point upper ends and two normal open point upper ends of relay KA1 are established ties respectively on voltage transformer secondary voltage and AC control power, two normal close point lower extremes and two normal open point lower extremes of relay KA1 connect secondary control power AC in parallel, relay KA 2's coil connects on the positive and negative pole of DC control power, two normal close point upper ends and two normal open point upper ends of relay KA2 are established ties respectively on rectifier bridge ZLQ's direct current side and DC control power, two normal close point lower extremes and two normal open point lower extremes of relay KA2 connect secondary control power DC in parallel, rectifier bridge ZLQ's alternating current side connects secondary control power AC, rectifier bridge ZLQ's direct current side connects secondary control power DC. And the mutual automatic switching of various power supply control modes can be realized.

Description

Automatic switching device for AC/DC universal control power supply of switch cabinet
Technical Field
The utility model relates to an electric power system technical field, concretely relates to cubical switchboard alternating current-direct current general control power automatic switching control equipment.
Background
The secondary loop of the switch cabinet refers to monitoring, controlling, measuring, regulating and protecting the work of primary equipment, and is configured as follows: measuring instruments, relays and signal elements, automatic devices, relay protection devices, current and voltage transformers and the like. The switchgear secondary circuit basically comprises: monitoring system, automatic device, high-voltage board divide, combined floodgate return circuit etc..
The most important part of the secondary circuit is the control circuit-including all relevant elements from the control power source to the opening and closing coils of the circuit breaker, such as: the contact and coil of fuse, control switch, intermediate relay, binding post etc..
The importance of the secondary control power supply is unparalleled, and the secondary control power supply carries a serious mission for system safety, so that the power supply is required to be very reliable to ensure that an automatic device, a protection device or a person can cut off a loop at any time, and the development of accidents and faults is limited.
At present, the secondary control power supply is single in form, namely, a direct current screen provides a direct current control power supply, or an alternating current power supply of a low-voltage distribution system, or the secondary voltage of a voltage transformer of the cabinet is utilized, and the three power supply forms have the possibility of faults. When the secondary control power supply fails, the switch cabinet cannot normally operate and work when the secondary control power supply is waited to recover to a normal state, and meanwhile, safety accidents are possibly caused by power failure of the secondary control power supply caused by the failure of the secondary control power supply, so that property loss and personal safety accidents are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an automatic switching device of a switch cabinet alternating current-direct current universal control power supply is provided to overcome not enough among the above-mentioned prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows: an automatic switching device of a switch cabinet alternating current-direct current universal control power supply comprises a rectifier bridge ZLQ, the relay KA1 and the relay KA2, the coil of the relay KA1 is connected to the phase voltage of the alternating current control power supply, the upper ends of two normally closed points and the upper ends of two normally open points of the relay KA1 are respectively connected in series to the secondary voltage of the voltage transformer and the alternating current control power supply, the lower ends of two normally closed points and the lower ends of two normally open points of the relay KA1 are connected in parallel with the secondary control power supply AC, the coil of the relay KA2 is connected to the positive electrode and the negative electrode of the direct current control power supply, the upper ends of two normally closed points and the upper ends of two normally open points of the relay KA2 are respectively connected in series to the direct current side of the rectifier bridge ZLQ and the direct current control power supply, the lower ends of two normally closed points and the lower ends of two normally open points of the relay KA2 are connected in parallel with the secondary control power supply DC, the alternating.
The utility model has the advantages that: the automatic switching of multiple power supply control modes can be realized, the stability and reliability of a secondary loop control power supply of the switch cabinet are ensured, the reliable operation of a power system is ensured, and the problems of production halt and serious safety accidents caused by power failure due to the failure of the secondary loop control power supply of the conventional switch cabinet, and property and personal safety are endangered are solved; the input cost is low, the device function is stable and reliable, and the device is particularly suitable for being used in a power system with strict requirements on the stability of a secondary control power supply.
Further, a breaker QF1 is also included, and two normally-open points of the breaker QF1 are connected in series on the alternating current control power supply.
Further, a breaker QF2 is also included, and two normally-open points of the breaker QF2 are connected in series on the secondary voltage of the voltage transformer.
Further, a breaker QF3 is also included, and two normally-open points of the breaker QF3 are connected in series on the direct current control power supply.
Further, a circuit breaker QF4 is also included, and two normally-open points of the circuit breaker QF4 are connected in series on the alternating current side of the rectifier bridge ZLQ.
The beneficial effect of adopting the four steps is as follows: the circuit breakers QF1, QF2, QF3 and QF4 play a role in power supply short-circuit protection, and protect a power supply and secondary elements from being damaged by short-circuit current.
Further, the terminal block XT is connected with a terminal block XT, a short-circuit piece a and a short-circuit piece b, and a relay KA1, a relay KA2, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, a secondary voltage of a voltage transformer, an alternating current control power supply, a secondary control power supply DC, a secondary control power supply AC and a direct current control power supply are all connected with the terminal block XT; when the secondary control power supply of the switch cabinet is alternating current, the short connection piece a and the short connection piece b are taken down, and KMa and KMn are connected with the secondary control power supply AC; when the switch cabinet secondary control power supply is direct current, KMa and KMa + are communicated through a short connecting piece a, KMn and KMn + are communicated through a short connecting piece b, and the first contact point and the second contact point are connected with the secondary control power supply DC.
Drawings
Fig. 1 is an electrical schematic diagram of the automatic switching device for the ac/dc universal control power supply of the switch cabinet of the present invention;
fig. 2 is a partial electrical schematic diagram of the automatic switching device for the switch cabinet ac/dc universal control power supply.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Embodiment 1, as shown in fig. 1, an automatic switching device of a switch cabinet AC/DC universal control power supply comprises a rectifier bridge ZLQ, a relay KA1 and a relay KA2, wherein a coil of the relay KA1 is connected to a phase voltage of an AC control power supply, upper ends of two normally closed points and upper ends of two normally open points of the relay KA1 are respectively connected in series to a secondary voltage of a voltage transformer and the AC control power supply, lower ends of two normally closed points and lower ends of two normally open points of the relay KA1 are connected in parallel to a secondary control power supply AC, a coil of the relay KA2 is connected to a positive electrode and a negative electrode of a DC control power supply, upper ends of two normally closed points and upper ends of two normally open points of the relay KA2 are respectively connected in series to a DC side of the rectifier bridge ZLQ and the DC control power supply, lower ends of two normally closed points and lower ends of two normally open points of the relay KA2 are connected in parallel to a secondary control power supply DC, an, the direct current side of the rectifier bridge ZLQ is connected with a secondary control power supply DC.
Embodiment 2, as shown in fig. 1 and fig. 2, this embodiment is a further improvement on embodiment 1, and specifically includes the following steps:
the automatic switching device of the switch cabinet alternating current and direct current universal control power supply further comprises a circuit breaker QF1, and two normally-open points of the circuit breaker QF1 are connected in series on the alternating current control power supply.
Embodiment 3, as shown in fig. 1 and fig. 2, this embodiment is a further improvement on embodiment 2, and specifically includes the following steps:
the automatic switching device of the switch cabinet alternating current-direct current universal control power supply further comprises a breaker QF2, and two normally-open points of the breaker QF2 are connected in series on the secondary voltage of a voltage transformer.
Embodiment 4, as shown in fig. 1 and fig. 2, this embodiment is a further improvement on embodiment 3, and specifically includes the following steps:
the automatic switching device of the switch cabinet alternating current-direct current universal control power supply further comprises a circuit breaker QF3, and two normally-open points of the circuit breaker QF3 are connected in series on the direct current control power supply.
Embodiment 5, as shown in fig. 1 and fig. 2, this embodiment is a further improvement on embodiment 4, and specifically includes the following steps:
the automatic conversion device for the switch cabinet alternating current and direct current universal control power supply further comprises a circuit breaker QF4, and two normally-open points of the circuit breaker QF4 are connected in series on the alternating current side of the rectifier bridge ZLQ.
Embodiment 6, as shown in fig. 1 and fig. 2, this embodiment is a further improvement on embodiment 5, and specifically includes the following steps:
the automatic switching device of the switch cabinet alternating current-direct current universal control power supply further comprises a terminal block XT, a relay KA1, a relay KA2, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, a secondary voltage of a voltage transformer, an alternating current control power supply, a secondary control power supply DC, a secondary control power supply AC and a direct current control power supply are all connected to the terminal block XT; the switch cabinet further comprises a short connecting piece a and a short connecting piece b, when the secondary control power supply of the switch cabinet is alternating current, the short connecting piece a and the short connecting piece b are taken down, and KMa and KMn are connected with the secondary control power supply AC; when the switch cabinet secondary control power supply is direct current, KMa and KMa + are communicated through a short tab a, KMn and KMn + are communicated through a short tab b, and a first contact point and a second contact point are connected with the secondary control power supply DC, wherein 101 in FIG. 1 represents the first contact point, and 102 represents the second contact point.
The voltage of the secondary control power supply AC is 220V, and the voltage of the secondary control power supply DC is 220V.
The circuit principle is as follows:
when the alternating current control power supply is normal, a coil of the relay KA1 is not electrified, and the secondary control power supply AC outputs the alternating current control power supply;
when the alternating current control power supply fails, a coil of the relay KA1 is electrified, and the secondary control power supply AC outputs secondary voltage of a voltage transformer of the cabinet, so that the functions of one-use one-standby and automatic conversion of a main power supply and a standby power supply are realized;
when the direct current control power supply is normal, the coil of the relay KA2 is not electrified, and the secondary control power supply DC outputs direct current control power supply;
when the direct current control power supply fails and is powered off, the coil of the relay KA2 is electrified, and the secondary control power supply DC is output as a direct current power supply of which the secondary control power supply AC is rectified by the rectifier bridge ZLQ, so that the functions of one main power supply and one standby power supply and automatic conversion are realized;
the alternating current control power supply, the direct current control power supply, the secondary voltage of the voltage transformer, the secondary control power supply AC and the secondary control power supply DC are connected through the input and output of a terminal row XT;
the circuit breakers QF1, QF2, QF3 and QF4 play a role in power supply short-circuit protection, and protect a power supply and secondary elements from being damaged by short-circuit current.
According to the type (AC or DC) of the secondary control power supply of the switch cabinet, the output mode (AC or DC) of the secondary control power supply is flexibly selected by using the short connecting piece a and the short connecting piece b, so that the wide application range of the invention patent of the utility model is embodied.
The utility model discloses a cubical switchboard secondary circuit controls power adopts three kinds of forms power: the three forms of power supplies achieve the purpose of one use and one standby through a power supply conversion circuit, and the continuity and the stability of the secondary control power supply are ensured;
the alternating current control power supply and the secondary voltage of the voltage transformer of the cabinet are mutually used and standby, the coil of the relay KA1 monitors the state of the alternating current control power supply, and when the alternating current control power supply is normal, the output end of the alternating current power supply outputs the alternating current control power supply to be used as the secondary control power supply; when the alternating current control power supply is powered off, the output end of the alternating current power supply outputs the secondary voltage of the voltage transformer of the cabinet as a secondary control power supply AC;
the output signal of the alternating current power supply and the direct current control power supply are used and standby mutually, the coil of the relay KA2 monitors the state of the direct current control power supply, and when the direct current control power supply is normal, the output end of the direct current power supply outputs the direct current control power supply as a secondary control power supply; when the direct current control power supply is powered off, the output signal of the alternating current power supply passes through a rectifier bridge ZLQ to output a direct current power supply as a secondary control power supply DC;
when the fault power supply is recovered to be normal, the relay KA1 and the relay KA2 switch the normal main power supply again to serve as a secondary control power supply, so that the purposes that three single power supplies are mutually used as one power supply and two standby power supplies and are automatically switched are achieved, and the reliable operation of a power system is guaranteed;
the utility model can realize the mutual automatic switching of a plurality of power supply control modes, ensure the stability and reliability of the secondary loop control power supply of the switch cabinet and ensure the reliable operation of the power system;
the utility model has the advantages that the problems of production halt and serious safety accidents caused by power failure due to the secondary loop control power failure of the existing switch cabinet are solved, and property and personal safety are endangered;
the utility model discloses with having simple circuit, input cost low, device function reliable and stable, be particularly suitable for using in the electric power system who has strict demand to the stability of secondary control power supply.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (6)

1. An automatic switching device of a switch cabinet alternating current-direct current universal control power supply is characterized by comprising a rectifier bridge ZLQ, a relay KA1 and a relay KA2, wherein coils of the relay KA1 are connected to the phase voltage of an alternating current control power supply, the upper ends of two normally closed points and the upper ends of two normally open points of the relay KA1 are respectively connected to the secondary voltage of a voltage transformer and the alternating current control power supply in series, the lower ends of two normally closed points and the lower ends of two normally open points of the relay KA1 are connected with a secondary control power supply AC in parallel, coils of the relay KA2 are connected to a positive electrode and a negative electrode of a direct current control power supply in series, the upper ends of two normally closed points and the upper ends of two normally open points of the relay KA2 are respectively connected to the direct current side of the rectifier bridge ZLQ and the direct current control power supply in series, the lower ends of two normally closed points and the lower ends of two normally open points of the relay KA2 are connected with a, and the direct current side of the rectifier bridge ZLQ is connected with a secondary control power supply DC.
2. The automatic conversion device for the AC/DC universal control power supply of the switch cabinet as claimed in claim 1, further comprising a breaker QF1, wherein two normally open points of the breaker QF1 are connected in series with the AC control power supply.
3. The automatic conversion device for the universal control power supply of the switch cabinet alternating current and direct current as claimed in claim 2, characterized by further comprising a breaker QF2, wherein two normally-open points of the breaker QF2 are connected in series on the secondary voltage of the voltage transformer.
4. The automatic conversion device for the AC/DC universal control power supply of the switch cabinet as claimed in claim 3, further comprising a breaker QF3, wherein two normally open points of the breaker QF3 are connected in series with the DC control power supply.
5. The automatic conversion device for the AC/DC universal control power supply of the switch cabinet as claimed in claim 4, further comprising a circuit breaker QF4, wherein two normally-open points of the circuit breaker QF4 are connected in series on the AC side of the rectifier bridge ZLQ.
6. The automatic converting device for the AC/DC universal control power supply of the switch cabinet as claimed in claim 5, further comprising a terminal array XT, wherein the relay KA1, the relay KA2, the circuit breaker QF1, the circuit breaker QF2, the circuit breaker QF3, the circuit breaker QF4, the secondary voltage of the voltage transformer, the AC control power supply, the secondary control power supply DC, the secondary control power supply AC and the DC control power supply are all connected to the terminal array XT; the switch cabinet further comprises a short connecting piece a and a short connecting piece b, when the secondary control power supply of the switch cabinet is alternating current, the short connecting piece a and the short connecting piece b are taken down, and KMa and KMn are connected with the secondary control power supply AC; when the switch cabinet secondary control power supply is direct current, KMa and KMa + are communicated through a short connecting piece a, KMn and KMn + are communicated through a short connecting piece b, and the first contact point and the second contact point are connected with the secondary control power supply DC.
CN202020091608.0U 2020-01-15 2020-01-15 Automatic switching device for AC/DC universal control power supply of switch cabinet Active CN211790921U (en)

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CN202020091608.0U CN211790921U (en) 2020-01-15 2020-01-15 Automatic switching device for AC/DC universal control power supply of switch cabinet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020091608.0U CN211790921U (en) 2020-01-15 2020-01-15 Automatic switching device for AC/DC universal control power supply of switch cabinet

Publications (1)

Publication Number Publication Date
CN211790921U true CN211790921U (en) 2020-10-27

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