JPS5851747A - Automatic start control system for emergency load - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic start-up control system for sequentially turning on emergency loads in groups when supplying emergency power when an emergency LLE source is installed.

In the power supply system* of a power generation unit, there are some in which two units share one emergency power supply device. Figure 1 shows such a system.

Power is received from the power receiving system IR3 through the starting transformer a4 to the starting metacluster bus 5, and the nine electric power is supplied to the A-side unit) 1 and the B-side unit 2. In the A-side unit 1, the A＠Metakura bus line 7-IK is connected by the A＠Metakura bus line connection breaker 6-1.
Supplied. Then, the voltage is stepped down by the A side power transformer -5-t,
All power center mother 49I9-1 was reached, and the emergency power supply was cut off! Power is received from 1O-IK to the A side emergency power source @ 11-1.

Units such as emergency power supply bus load I/c#i, control power supply unit, oil pump, station compressor, emergency lighting, etc.) o
There are many loads that are essential for stopping operation, so the power receiving system I
l! There is an accident in 3. VHDA side metacla bus line contact @3
In the event of a failure to turn on 6-1 or an accident on the A-side metacluster bus 7-1, the emergency power receiving breaker 1O-1t@Sho All emergency generator cutoff@12-1ft is turned on. Then, the vehicle side emergency load switch 14-In for the A-side rod regular load 13-sum is turned on by manual operation by the operator.

According to this method, there is a delay in starting the emergency load due to differences in the judgment of each operator, timing of operations, etc., and damage to the emergency power bus [15] due to superimposition of starting currents during simultaneous startup, or simply placing an extreme burden on the emergency load. This is undesirable because the probability of inducing operational errors by operators during emergencies is high. In particular, when two units share one emergency power supply 15, the probability of the above-mentioned problem occurring increases.

The purpose of the present invention is to detect the undervoltage of the emergency power supply bus or use an automatic synchronization device to connect the emergency power supply and the emergency power supply bus by the method of the former power outage switching and the latter uninterruptible switching. Prioritize the required loads by calculating in advance the starting current at the time of simultaneous start-up of loads within the withstand capacity of the emergency power supply, forming groups, and sequentially turning on the groups. Prevent damage caused by superimposed starting currents, reduce economy by reducing capacity, reduce operator errors, save labor, and prepare for safe shutdown of electrical plants and immediate restart operations after recovery from an accident. This is an automatic start-up control system for an emergency load for the purpose of arranging the load.The present invention will be explained below with reference to an embodiment based on the drawings.First, the @1 display indicates the relationship between the input order and the input group. It is.

Entry side unit 1, B111 in Figure 111 in Table 1
In unit 2, A@emergency load 13-In is connected to four load groups, the first group, the third group, the fifth group, the seventh group, and the sum of the starting currents of the load groups of the emergency power supply. Similarly, the B11 emergency load 13-2n has four load groups: the second group, the fourth group, and the sixth group. , and the eighth group. Furthermore, when the load of the emergency power supply device 15 is to bear the input side emergency load 13-1ntB side emergency load 13-2n at the same time, priority is given to the All emergency load 13-In in this case. It is possible, and is divided into three cases: A-side emergency load 13-In alone and B@emergency load 13-2n alone.

Inlet side emergency load 13-In and B side emergency load 13”2n
In the case of bearing the burden at the same time, the @1 group will start up immediately when the power of the A side emergency power supply bus 11-1 is restored, and then the @2 group, the 3rd group, the 4th group...
Start with the 8th group @A11 emergency load 13-I
In the case of njp Germany gi mi group A @ emergency power supply bus 11
- It starts immediately when the power supply of I83. Fifth. In the case of the B side emergency load 13-2n alone following the 7th group - Start up at the request of $1 step to 4th step in the same dlx table - Startup order The number of load groups is the withstand capacity of the emergency power supply 15 and vehicle side emergency load 13-1n, Bi
Determined by the number of emergency loads 13-2n, starting current, and starting priority.◎ The logic in FIG. 2 is based on the fact that all emergency loads 13-In in FIG. In Table 1 of Kyubasha, "When the A side rod regular load is alone J, that is, the A side emergency generator breaker 12-1 is closed 12-1-1.
NOT, B side emergency generator breaker 12-2 is closed 12-2-1 NOT's 0R16 and A AND of power reception breaker 10-2 closed 10-2-1
And time passes 17 AND 1fi-17 cuts off all emergency power supply @ 10-1 closes 10-1-1 and Bll
Emergency power supply receiving cutoff 1610-2 is closed 10-2-1 is an OR signal KAIIAll Emergency power supply receiver 1O-1 is closed '1G-1-1ONO'r 18 #AN
I) The time taken by A, that is, all the emergency power supply power receiving circuit breakers 10-1 are connected, and the emergency generator circuit breaker 12-1 is the same in KBII unit 2. A signal 19 is used to confirm that a condition has occurred and is not superimposed. And the inlet side emergency generator breaker 12-
By ANDing signal 1 and signal 20, which indicates that neither of the emergency generator circuit breaker 12-2 is closed, the signal busy A confirms that the load of the emergency power supply device 15 is not carrying both of them. @Emergency generator breaker 12-1 closes 21 AND K and wipes out by step timer 22, thereby forming group sequential activation signal 23.

A [When the emergency load 13-11111 receives the group sequential start signal 23, it first performs the stop 29 operation, then holds the signal after the step timer 22 operates, and starts it together with the other start signal 31. The hold that is inserted into the 3° circuit is wiped out with the cut signal 32. Step tie! 22 settings, three restarts are performed for the requests of the 113 group 24, the $5 group 25, and the 7th group 26. ◎The regular load 13-20 on the B side rod in Figure 1 becomes the sole load of the emergency power supply jill 15. r in Table 1 for the case
When Bi [emergency load alone], the A side valve receives the normal power supply as described above and the interrupter 10-1 closes 10-1-1 NOTl.
G receives power from the B side emergency power supply and interrupter 10-2 closes 10-2
-1 NO'r27, A11l emergency generator breaker 12-1 is closed 21f:, B side emergency generator breaker 12
This becomes possible by replacing -2 with close 28.

The logic in Figure 3 is the emergency power supply equipment 15 in Figure 1.
The A side valve regular power supply receiving breaker 10-1 and BII emergency power supply receiving breaker 10-2 open, A [, ll = regular generator breaker 12-1, B side rod regular generator cut off! !
! 12-2 are both closed to carry the A11 emergency load 13-1n and the B-side regular load 13-2n, a temporary stop signal 33 is generated, and the step timer 22 wipes out the A-even emergency load. Load/B side emergency load fltl
The group sequential start signal 34 when carrying the emergency load is inserted into the load-side circuit within the two-dot chain line in FIG. 2 in the same way as the stop signal and restart signal when carrying the emergency load individually. Depending on the settings of the step timer 22, the second group 35, the third group 36, the $4 group 3), the fifth group 38, the sixth group 39, the seventh group 40, etc. The eighth group 41 corresponds to the starting order in Table 1, and can be started sequentially with priority over the emergency load 13-In1 in @1 step to step 4.

Emergency condolence message #! using the method described above! Even if there are multiple load groups, automatic startup control is possible in the event of an emergency, economical maintenance of emergency power supply equipment at electrical stations, safe shutdown of plants and preparation for restart, It can greatly contribute to labor saving.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a power supply system of a power generation unit, FIG. 2 is a block diagram showing one embodiment of the present invention, and FIG. 3 is a block diagram showing another embodiment of the present invention. 1...A[unit 2...B side unit 3...
・Power receiving system 4・・Starting transformer 5・・Starting metal bus bar 6-1 ・Incoming metal bus bar connection breaker 7-1・・・
A-side metacluster bus 8-1 ・A-side dynamic power transformer 9-1
...A power center bus 10-2...Bll emergency power supply power receiving breaker 10-1.
・・A side valve regular power supply power receiving breaker 11-I A11l
Emergency power supply bus bar 12-2... B side rod regular generator breaker 12-1...
All emergency generator breaker 13-In...A @ emergency load 132n -B (15 emergency load 14-In-A side bar regular load switch 15... emergency load R@g

Claims (1)

[Claims] In emergency power equipment installed at an electrical station, when the emergency power supply is lost, the emergency load is temporarily stopped by a communication signal between the emergency power supply device and the emergency power bus, and the emergency power supply and the emergency power supply are switched off. The busbar connection IK simultaneously starts up the emergency loads within the withstand capacity range of the emergency power supply device calculated in advance, and takes into account the superposition of the starting current and the start-up priority of the emergency loads, and forms nine groups. An automatic start control system for emergency loads that uses a timer to sequentially block groups so that the superimposed value of start-current of a load group does not exceed the withstand capacity of the device.