Novel redundant power supply automatic switching and on-line monitoring device

Abstract

The utility model relates to a low-voltage power distribution device, and aims to provide a novel redundant power supply automatic switching and on-line monitoring device, which can realize automatic switching power supply of two paths of power supplies and provide an on-line monitoring function of the two paths of power supplies, and has the characteristics of convenience in debugging, low investment cost, low maintenance cost and the like. According to the technical scheme, the automatic switching and online monitoring device for the redundant power supply is characterized by comprising two circuit breakers, two relays and two contactors, the two circuit breakers control a first power supply and a second power supply to supply power respectively, a first relay, a first contactor and a normally-closed contact of a second contactor are connected in a first power supply loop, and a second relay, the first contactor, a normally-closed contact of the first relay and the second contactor are connected in a second power supply loop. And finally, the two sets of power supply loops are connected in parallel to form a load C redundant power supply loop, and the normally open contacts of the two relays are respectively used as remote transmission signals to carry out power supply on-line monitoring.

Description

Technical Field

[0001] The utility model relates to a low-voltage power distribution device, in particular to a new type of redundant power supply automatic switching and on-line monitoring device. Background Technique

[0002] With the continuous improvement of the degree of informatization, the requirements for the stability and reliability of system operation in various key fields are getting higher and higher. The traditional single-power-supply power supply mode can no longer meet these needs. Therefore, the dual-power-supply redundant power supply technology has emerged and developed with the continuous development of the times; conventional redundant power supply switching devices, such as KS-16J of Ke Yuan, etc. Although conventional redundant power supply switching devices can meet the requirements of redundant power supply switching, there are also the following problems: First, conventional redundant power supply switching devices are all off-the-shelf products and can only use the functions set by the manufacturer, such as single alarm output, and it is impossible to confirm which power supply has a fault, and the rated working current of the power supply circuit cannot be adjusted according to actual needs; Second, when a conventional redundant power supply switching device fails, generally the whole device needs to be replaced, and the equipment maintenance cost is relatively high; Third, the price of conventional redundant power supply switching devices is usually very high, and a large installation space is required. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the above background technique and provide a new type of redundant power supply automatic switching and on-line monitoring device, which should be able to realize automatic switching power supply of two power supplies, provide on-line monitoring functions of two power supplies, and have the characteristics of convenient debugging, low input cost, low maintenance cost, reliable operation, etc.

[0004] The technical solution of the utility model is as follows:

[0005] A new type of redundant power supply automatic switching and on-line monitoring device includes a first power supply that supplies power to a load through a first circuit breaker, and a second power supply that supplies power to the load through a second circuit breaker; it is characterized in that:

[0006] Three branches are connected in parallel between the phase line and the neutral line of the first circuit breaker, including a first power supply monitoring branch with a first relay, a first switching power supply branch in series with a normally closed contact of a second contactor and a first contactor, and a first load branch in series with a first normally open contact of the first contactor, the load and a second normally open contact of the first contactor in sequence;

[0007] Three branches are connected in parallel between the phase line and the neutral line of the second circuit breaker, including a second power supply monitoring branch with a second relay, a second switching power supply branch in series with a normally closed contact of the first contactor, a normally closed contact of the first relay and a second contactor, and a second load branch in series with a first normally open contact of the second contactor, the load and a second normally open contact of the second contactor in sequence.

[0008] The normally open contacts of one relay are connected in parallel with the normally open contacts of another relay as a power failure signal, which is transmitted remotely to the DI channel of the main system for online power monitoring; alternatively, the normally open contacts of the first relay are used as an abnormal signal for the first power supply circuit, and the normally open contacts of the second relay are used as an abnormal signal for the second power supply circuit, which are transmitted remotely to the DI channel of the main system for online power monitoring.

[0009] The phase wire end of the load is simultaneously connected to the first normally open contact of the first contactor and the first normally open contact of the second contactor, and the neutral wire end of the load is simultaneously connected to the second normally open contact of the first contactor and the second normally open contact of the second contactor.

[0010] The beneficial effects of the present utility model are as follows:

[0011] On the basis of ensuring the function of automatic switching of redundant power supplies, the present utility model uses a power supply circuit built by relays and contactors to replace the conventional redundant power supply switching device. By using the working principles of contactors and relays, it realizes the automatic switching of redundant power supplies in milliseconds, adds customizable online power monitoring signals, and the contactors can select equipment according to the rated working current of the power supply circuit, which is convenient for users to set the scheme according to their own needs. At the same time, each device is independent and operates reliably. When a device fails, it is not only convenient to replace, but also can be replaced online. In addition, the total price of the entire device is much lower than that of the conventional redundant power supply switching device. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the connection relationship of each component in the embodiment of the present utility model.

[0013] Figure 2 It is a schematic diagram of the connection relationship of each component in the prior art.

[0014] Reference numerals in the figure: first circuit breaker 1, first relay 2, normally closed contact 2-1 of the first relay, first contactor 3, first normally open contact 3-1 of the first contactor, second normally open contact 3-2 of the first contactor, normally closed contact 3-3 of the first contactor, second circuit breaker 4, second relay 5, second contactor 6, first normally open contact 6-1 of the second contactor, second normally open contact 6-2 of the second contactor, normally closed contact 6-3 of the second contactor, first power monitoring branch 7, first power switching branch 8, second power monitoring branch 9, second power switching branch 10, conventional redundant power supply switching device 11, first power supply A, second power supply B, load C. Detailed Embodiments

[0015] The following further illustrates the present utility model in conjunction with the accompanying drawings of the specification, but the present utility model is not limited to the following embodiments.

[0016] AsFigure 1 The novel redundant power supply automatic switching and online monitoring device shown includes a first power supply A that supplies power to a load C through a first circuit breaker 1, and a second power supply B that supplies power to the load through a second circuit breaker 4; this is similar to the prior art.

[0017] The improvements made in the present utility model are as follows: First, three branches are connected in parallel between the phase line and the neutral line of the first circuit breaker. The first branch is a first power supply monitoring branch 7 in which a first relay 2 is connected in series. The second branch is a first switching power supply branch 8 in which a normally closed contact 6-3 of a second contactor and a first contactor 3 are connected in series. The third branch is a first load branch in which a first normally open contact 3-1 of the first contactor, the load, and a second normally open contact 3-2 of the first contactor are connected in series.

[0018] Second, three branches are connected in parallel between the phase line and the neutral line of the second circuit breaker. The first branch is a second power supply monitoring branch 9 in which a second relay 5 is connected in series. The second branch is a second switching power supply branch 10 in which a normally closed contact 3-3 of the first contactor, a normally closed contact 2-1 of the first relay, and a second contactor 6 are connected in series. The third branch is a second load branch in which a first normally open contact 6-1 of the second contactor, the load, and a second normally open contact 6-2 of the second contactor are connected in series.

[0019] Figure 1 It can be seen that the phase line end of the load is simultaneously connected to the first normally open contact of the first contactor and the first normally open contact of the second contactor, and the neutral line end of the load is simultaneously connected to the second normally open contact of the first contactor and the second normally open contact of the second contactor.

[0020] The first relay 2 is a relay for "first power supply monitoring"; the normally closed contact 6-3 of the second contactor is connected in series to the power supply terminal of the first contactor. The two normally open contacts (3-1, 3-2) of the first contactor are connected in series at both ends of the load, and then the two are connected in parallel to form a "first power supply switching circuit". The second relay is a relay for "second power supply monitoring"; the normally closed contact 3-3 of the first contactor is connected in series with the normally closed contact 2-1 of the first relay and the power supply terminal of the second contactor. The two normally open contacts of the second contactor are connected in series at both ends of the load, and then the two are connected in parallel to form a "second power supply switching circuit".

[0021] When the utility model works, the first power supply is defaulted as the main power supply. First, close the first circuit breaker 1. The first relay is electrified, and the second contactor is not electrified. The normally closed contact 6-3 of the second contactor remains closed. The first contactor is electrified, and the two normally open contacts (3-1, 3-2) of the first contactor are closed. The load is powered by the first power supply. Then close the second circuit breaker 4. The second relay is electrified. At this time, both the first contactor 3 and the first relay 2 are in the electrified state. The normally closed contact 3-3 of the first contactor and the normally closed contact 2-1 of the first relay are both in the open state. The second contactor 6 is not electrified. Therefore, the two normally open contacts (6-1, 6-2) of the second contactor are in the open state.

[0022] When the first power supply is abnormal, the first contactor 3 and the first relay 2 are in the de-energized state, and the two normally open contacts (3-1, 3-2) of the first contactor are disconnected. In the second power supply switching branch, the normally closed contact 3-3 of the first contactor and the normally closed contact 2-1 of the first relay are closed. The second contactor 6 is electrified, and the two normally open contacts (6-1, 6-2) of the second contactor are closed. The load is powered by the second power supply. When the first power supply returns to normal, the first relay 2 is electrified, and the normally closed contact 2-1 of the first relay is disconnected. The second contactor 6 in the second power supply switching branch is de-energized, and the load is powered by the first power supply instead. On the contrary, if the second power supply is abnormal, the second relay 5 is in the de-energized state, and the second contactor is originally in the non-electrified state, so there is no other action.

[0023] Regarding the on-line monitoring of the power supply, check whether the number of DI channels in the main system is sufficient. If it is sufficient, the normally open contact of the first relay can be used as the monitoring point for the first power supply, and the normally open contact of the second relay can be used as the monitoring point for the second power supply. The generated signals are sent to two DI channels for separate monitoring. If it is not sufficient, the normally open contact of the first relay, the normally open contact of the second relay, and other power supply monitoring points can also be connected in series, and the generated signals are sent to the DI channel as a power supply abnormality alarm signal. Or after the normally open contact of the first relay and the normally open contact of the second relay are connected in parallel, and then connected in series with other power supply monitoring points, the generated signals are sent to the DI channel as a power supply failure alarm signal.

[0024] Both of the described contactors can adjust the equipment model according to the actually required power and rated working current.

[0025] The utility model proposes a brand-new redundant power supply switching method. It breaks the inherent mode of the conventional redundant power supply switching device. Based on relays and contactors, it builds an automatic power supply switching circuit to achieve the automatic power supply switching function in milliseconds. At the same time, it uses the above-mentioned relays to build a power supply on-line monitoring system, which greatly reduces the equipment cost, reduces the equipment installation space, has low maintenance cost, and can adjust the scheme design according to its own use environment.

Claims

1. A new type of automatic switching and on-line monitoring device for redundant power supplies, comprising a first power supply (A) that supplies power to a load (C) through a first circuit breaker (1), and a second power supply (B) that supplies power to the load (C) through a second circuit breaker (4); characterized in that: Three branches are connected in parallel between the phase line and the neutral line of the first circuit breaker, including a first power supply monitoring branch (7) with a first relay (2), a first switching power supply branch (8) connected in series with a normally closed contact (6-3) of a second contactor and a first contactor (3), and a first load branch connected in series with a first normally open contact (3-1) of the first contactor, the load, and a second normally open contact (3-2) of the first contactor in sequence; Three branches are connected in parallel between the phase line and the neutral line of the second circuit breaker, including a second power supply monitoring branch (9) with a second relay (5), a second switching power supply branch (10) connected in series with a normally closed contact (3-3) of the first contactor, a normally closed contact (2-1) of the first relay, and a second contactor (6), and a second load branch connected in series with a first normally open contact (6-1) of the second contactor, the load, and a second normally open contact (6-2) of the second contactor in sequence.

2. The novel redundant power supply automatic switching and online monitoring device according to claim 1, wherein: The normally open contacts of one relay are connected in parallel with the normally open contacts of another relay as a power failure signal and transmitted remotely to the DI channel of the main system for on-line power monitoring; or the normally open contact of the first relay is used as an abnormal signal for the first power supply circuit, and the normally open contact of the second relay is used as an abnormal signal for the second power supply circuit, and they are transmitted remotely to the DI channel of the main system for on-line power monitoring.

3. The novel redundant power supply automatic switching and online monitoring device according to claim 2, wherein: The phase line end of the load is simultaneously connected to the first normally open contact (3-1) of the first contactor and the first normally open contact (6-1) of the second contactor, and the neutral line end of the load is simultaneously connected to the second normally open contact (3-2) of the first contactor and the second normally open contact (6-2) of the second contactor.

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