JPS6056379B2 - Dual power supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a redundant power supply technology, and particularly to a redundant power supply system that uses a computer or the like as a load.

This type of system is generally required to be highly reliable and easy to maintain, as well as being required to have independent power supplies for each system and quick recovery from failure. There is a need to minimize the impact of a malfunction on others. Further, as the power source itself, a CVCF (constant voltage sweet frequency power source) is used. The following two systems are known as redundant power supply systems.

I) Power supply side parallel redundant operation (single system, CVCF duplication)
Figure 1 shows this method.

In the figure, number 1 is the 1-system CVCF, and number 2 is the 2-system CVCF. Also, 11, 21, and 31 are determined by inputting the eye system, and 1
2, 22, 32 are connected to the transformer, 13, 23, 3
3 is a transformer output, and 16, 26, and 36 are transformers. Although this method has a complete backup against failures on the power supply side, that is, the CVCF side, it has the disadvantage that in the event of a short circuit on the load side, both CVCFs will be disconnected and power cannot be supplied to the entire system (systems A, B, and C). ing.

)) Redundant system using common system (C system) switching Figure 2 shows this system.

In the figure, SW is a changeover switch, and other symbols are the first
Same as figure. In this system, since the A system and the B system are completely independent, power cannot be supplied when the CVCF of the eye system is disconnected (for example, when the 1 system CVCF is disconnected, power cannot be supplied to the A system). In addition, due to a load short circuit in the C system (common device load system), the CVCF of the connected system is disconnected and power cannot be supplied. Furthermore, if the changeover switch SW is of an automatic changeover type, there is a risk that a short circuit in the C system load will cause the CVCF of both stations to be disconnected, making it impossible to supply power to the entire system. Therefore, it is an object of the present invention to eliminate the above-mentioned drawbacks, to enable power supply to areas other than the faulty part in the event of a bus failure, and to supply power to areas other than the faulty part when one system CVCF is cut off.
To provide a redundant power supply system that enables power supply from a VCF and does not affect other systems when a C system load is short-circuited.

A feature of the present invention is that it has two busbar systems in which each busbar separated by a line disconnector is successively connected in series via a transformer, and that each system is supplied with power from a different power supply device. Connect the output side terminal of the input-side breaker installed on each bus in the system to the input-side breaker installed on the bus with the same bus voltage of the other system via the input breaker for the other system. The circuit is connected to the input side terminals of each bus, and the closing of the disconnector for each other system input is performed on the condition that the disconnector provided on the corresponding bus bar is opened.

Closing and opening conditions for the shield disconnector for inputting other systems and the shield disconnector provided on the corresponding bus bar can be configured very easily using a mechanical interlock mechanism. C series (
For common equipment load systems), the point on the bus of both bus systems will be the feeding point. Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an embodiment of the invention. In the drawings, the same reference numerals as in FIGS. 1 and 2 indicate the same components. 1 series CVCFl, 2 series CV
The output of the CF2 is supplied to the AC2OOV load of the A system or the B system after passing through the own system input disconnectors 11 and 21 or the other system input disconnectors 14 and 24, respectively.

Each system has a transformer input and disconnectors 12 and 22.
■／130■ Passes through the transformers 16, 26 to the second own-system input disconnector 13, 23 (self-system transformer output disconnector) or the other-system input disconnector 15, 25 ( Power is supplied to the AClOOV load of system A or system B through the other system transformer output or disconnector. Between each side disconnector 11, 12, 14, 21, 22,
Mechanical interlocks are provided between 24, 13 and 15, and 23 and 25 under the following conditions.

An embodiment of the mechanical interlock is shown in FIG.

Figure 10A shows a three-point mechanical interlock (for example,
A disconnector or MCB (MagnetiOCircui)
tBreaker: an electromagnetic switch (applied to the interlock between 11, 12, and 14), shown in Figure 10C]?
2-point mechanical interlock (for example, disconnector 13)
, 15). I want to take the interlock or the disconnector (MCB in the following)
It is abbreviated as ) are arranged on the left and right, and a lever that can be moved left and right is provided in the center, and whether or not the lever can be operated is determined by the positional relationship between this lever and the on/off knob of the shimmer cutter. 1st
To briefly explain the operation of the two-point interlock shown in Figure 0, MCB15 cannot be directly turned ON in the lever position shown. Further, when MCBl3 is ON, the lever cannot be moved from the illustrated position. So first M
Set CBl3 to 0FF, then move the lever to the left. This lever movement unlocks the on/off knob of the MCBl5, so the MCBl5 can be set to ON. Since the three-point interlock is a combination of two-point interlocks, that is, the two-point interlock of MCBll and MCBl4 and the two-point interlock of MCBl2 and MCBl4, the explanation of the operation will be omitted.

Next, we will discuss how to supply power in the event of a problem. (1) When one system CVCF fails (e.g. 1 system CVCFl fails) When 1 system CVCFl fails during normal operation of both systems (A system and B system), 200V and 100V of A system Both loads are supplied with power from the second system CVCF2.

After disconnecting MCBll and l2 by mechanical interlock as shown in Figure 10A, MCBl4 is input and AC2 is turned on.
OO ■ Supply power to the load, then disconnect MCBl3 and connect MCBl
5 to supply power to the AClOO■ load (therefore, even if one system CVCF fails, power can be supplied to all loads.)
. The feature here is that in switching to the 2-system CVCF2,
The power is supplied to the A system 100■ load via the transformer 26. This is because if the transformer 16 is used, it will affect the inrush current at the time of turning on, so this is prevented. For this reason, in the present invention, a mechanical interlock is used to disconnect not only MCB11 but also MCB12 when turning on MCB14, so that no input is applied to the transformer 16. In other words, the transformer 16 becomes de-energized during the power switching from the 1st system CVCF1 to the 2nd system CVCF2, so if a method is adopted in which a new power supply (2nd system CVCF2) is applied to it, the power-on phase will be In some cases, the magnetic flux density may become excessive immediately after turning on, causing the iron core to saturate, approaching a concentric state, and causing a large current to rush in, resulting in a drop in output voltage, etc.

On the other hand, since the transformer 26 remains energized, the above-mentioned problem does not occur. The power supply system for system 1 CVCF1 failure is shown in Figure 5 (only the live line system is shown).

The same shall apply hereinafter). (2) When a single-line transformer fails (e.g.
A system transformer failure) A system transformer 1 occurs during normal operation of both systems.
6 fails, the A system 200V load will be transferred to the 1 system CVC.
From Fl, the A-system 100■ load is supplied with power from the 2-system CVCF2.

First, after switching MCB12, if MCB11 is tripped, it is turned on and power is supplied to the A system 200■ load using the 1 system CVCF1. Next, MCBl3 is disconnected, MCBl5 is turned on, and the second system CVCF2 supplies power to the A system 100V load.
Therefore, even if the single-line transformer is out of order (or under repair), full load power can be supplied. The power supply system at this time is shown in FIG. (3) When one system 200V side bus bar fails (e.g. A system 200
(Bus bar short circuit) If a 200V bus bar short circuit occurs in the A system while both systems are operating normally, the A system 100V load will be supplied with power from the 2nd system CVCF2.

Since MCBll trips when the bus bar is short-circuited, MCBll
By cutting 2, l3 and introducing MCBl5, A
The 100V load system is supplied with power from the second system CVCF2.
Therefore, there is no effect on other buses due to the 200V line short circuit. The power supply system at this time is shown in FIG. (4) When one system 100V side bus malfunctions (e.g. A system 100V bus short circuit) When the A system 100V bus short circuit occurs during normal operation of both systems, A
The system 200■ load can be supplied with power from the system 1 CVCF1.

MCBl3 trips when the A system 100■ bus is short-circuited, but it is expected that the 1st system CVCFl will stop due to the short-circuit current on the primary side of the transformer 16 until it trips. At this time 1
It is necessary to restart the system CVCF1. Figure 8 shows the power supply system for system A 100■ bus short circuit. (5) At the time of individual load failure (for example, individual load short-circuit) If an individual load is short-circuited while both systems are operating, the MCB for individual load will only trip and the power supply system will not be affected.

(6) In case of double failure Since the above-mentioned combination occurs, the explanation will be omitted and only the power supply system will be illustrated in FIG.

The x mark indicates the failure location. Although double failures other than those illustrated in FIG. 9 are possible, cases A, 0, and C in FIG. 9 seem to be the cases in which the load system can actually satisfy the function. Next, the power supply system to the C-system load (common device for A-system and B-system) will be described (FIG. 4). (1) Method of operating DC power supplies in parallel In FIG. 4, the outputs of the A-system DC power supply device 17 and the B-system DC power supply device 27 are connected in parallel to supply power to the C-system 1.

Therefore, when the C system 1 load is short-circuited, the A system due to the short circuit current,
DC power supplies 17 and 27 are installed so as not to affect the B system bus.
It is necessary to set the primary short circuit current of (2) Method of switching input power source In Fig. 4, the 2-input switching DC power supply device 37 is always connected to A
Power is supplied from the system bus, and when the A system power is cut off, power is automatically switched to the B system bus.

In the case of a short circuit in the C system 2, it is possible that it will affect the connected bus, but in the worst case, the power supply will be cut off on one side, so there is no need to be too concerned about the primary side short circuit current. Next, C
Let's talk about the capacity of the VCF and transformer.

As mentioned above, there are cases where loads are applied to both systems at the same time, so the following restrictions apply. Total 200V load on A system: LA2 Total 100V load on A system: LAl Total 200V load on B system: LB2 Total 100V load on B system: LBl Then, 1st system CVCF/2nd system CVCF: LA2 + LAl + LB2
+LBl2 system transformer/B system transformer: LAl+LBl is required.

As described above, according to the present invention, the C system bus is eliminated, and each primary voltage (200 V) bus of the A system and B system and each secondary voltage (10
0V) to the bus bar, connect another system input or a disconnector (for example, MCBl4
, l5), and for the primary voltage bus system, install a first self-system input terminal and disconnector (e.g., MCB
ll), take the above-mentioned mechanical interlock with the own system transformer input disconnector (e.g. MCBl2), and for the secondary voltage bus system, install the second own system input disconnector (example MCBl3)
By implementing a mechanical interlock that eliminates simultaneous power supply by the own system and other systems, the following effects can be obtained.

(1) When the own system CVCF fails, power can be supplied from the other system CVCF.

(2) When a bus fails, power can be supplied to other buses.

(3) If one transformer fails, power can be supplied to all buses. (
4) Since the configuration does not have a C-system bus, there is no C-system bus failure.

Since the C system is configured to receive power from the A system and B system buses, the influence of a C system load short circuit on the A system and B system buses is reduced. (5) Reliability, maintainability, and power restoration processing speed are improved by duplicating bus bars and transformers for each CVCF system. In addition to the above-mentioned redundant power supply technology, the present invention also provides
It is thought that it can also be applied as a technology for dual signal input.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a conventional dual power supply system with parallel redundant power supply system, Figure 2 is a system diagram of a conventional dual power supply system with switching power supply system, and Figures 3 and 4 are system diagrams of a redundant power supply system with redundant power supply system according to the present invention. System diagram of the supply system, Figure 5 is a power supply system diagram according to the present invention when a single system power supply fails, Figure 6 is a power supply system diagram according to the present invention when a single system transformer fails, and Figure 7 is a single system primary voltage bus Power supply system diagram according to the present invention at the time of failure,
Figure 8 is a power supply system diagram according to the present invention in the event of a single secondary voltage bus failure, Figure 9 is a power supply system diagram according to the present invention in the event of a double failure, and Figure 10 is a schematic external view of the mechanical interlock. . 1:1? CVCF (first power supply), 2:2 system CVC
F (second power supply), 11, 21: own system input and disconnection, 14, 24, 15, 25: other system input and disconnection, 12,
22: Transformer input disconnector, 13, 23: Transformer output disconnector, 16, 26: Transformer.

Claims (1)

[Claims] 1. A bus bar formed by sequentially connecting in series a shield breaker for the own system input, a primary voltage load, a shield breaker for the transformer input, a transformer, a shield breaker for the output of the own system transformer, and a secondary voltage load. Two systems are provided, each system is supplied with power from a different power supply device, and the output side terminal of the self-system input switch and disconnector provided on one bus system is used to connect the other system input and disconnector. The terminals are connected to the input side terminals of the self-system input shunt breaker of the other bus system through the terminals, and further connected to the output side terminals of the self-system transformer output shunt breaker provided on one bus system. Connect to the input side terminals of the own system transformer output circuit breaker of the other bus system through the other system transformer output circuit breaker, and turn on each other system input circuit breaker. , the mechanical interlock mechanism is used to open the respective system input shield disconnectors and each transformer input shield disconnector provided in the corresponding bus system, and each other system transformer output disconnector is opened. A redundant power supply system characterized in that a mechanical interlock mechanism is used to turn on a circuit or disconnector on the condition that the output circuit or disconnector for each system transformer installed in the corresponding bus system is opened. .