JPS58190235A - Automatic power factor regulation controller - 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] This invention relates to an automatic power factor adjustment control device,
In particular, it relates to an automatic power factor adjustment control device that detects physical quantities proportional to the reactive component of power used in a circuit, such as reactive power, reactive current, and power factor, and outputs a signal to adjust the input of a power factor correction capacitor. be.

FIG. 1 is an electrical wiring diagram showing a conventional power factor automatic adjustment control device. In FIG. 1, the circuit bus (1) is one whose power factor is adjusted. The instrument transformer (2) is connected to the circuit busbar (1
) is used to detect the voltage. The instrument current transformer (3) detects the current of the circuit bus (1). The automatic power factor adjustment device (4) inputs signals from the potential transformer (2) and potential current transformer (3) to measure reactive power, and when this value reaches a preset capacitor input point. Then, the make contacts (4111) to (41f) are closed and a capacitor closing signal is output, and when the preset capacitor cutoff point is reached, the break contacts (42a) to
(42f) is opened to output a capacitor cutoff signal, and these signals are output in an order called cyclic control, and these signals are contact outputs and are output for a certain period of time. Load (5a) ~ (5C)
are connected to the circuit bus (1) via transformers (6a) to (6c), respectively, and are supplied with power from the circuit bus (1). Capacitors (7a) to (7) for power factor improvement
f) are connected to the circuit bus (1) via electromagnetic contactors (8a) to (8f) and series reactors (91 to (9f)), respectively.
The power factor of the circuit bus (1) is improved. The make auxiliary contacts (81a) to (81f) close when the electromagnetic contactors (8a) to (8f) are closed, and are connected to the input signal stop terminal of the automatic power factor adjustment device (4) and the common terminal.
When all the capacitors are closed, the output of the capacitor input signal from the automatic power factor adjustment device (4) is stopped. Break auxiliary contact (82m) ~ (82f)
is closed when the electromagnetic contactors (8a) to (8f) are opened, and is connected to the cutoff signal stop terminal of the automatic power factor adjustment device (4))
and a common terminal, and when all are closed, the output of the capacitor cutoff signal from the automatic power factor adjustment device FIT (4) is stopped. The control circuit section QQ consists of a relay and a timer, and is equipped with an automatic power factor adjustment device'#1 (4).
The electromagnetic contactor (
8a) to (8f), and in the event of an overvoltage, overcurrent, or accident on the circuit bus (1), electromagnetic contactor (8a) to
(8f) is opened to protect the capacitors (7a) to (7f), and the electromagnetic contactor (8f) can also be opened manually.
Opening/closing control of a) to (8f) can be performed. In addition,
Make auxiliary contacts (gla) to (81f) and break auxiliary contacts (82a) to (82f) are connected to capacitors (7a
) to (7f) are all turned on or cut off, the automatic power factor adjustment device fl(4) outputs a capacitor turn-on signal or a capacitor cut-off signal,
The purpose of this is to prevent unnecessary operations of the relays, etc. of the control circuit section OI, and to prevent the control order of cyclic control from being disrupted.

Next, the operation will be explained. Now, when the power factor of the circuit bus (1) decreases and its value becomes less than a predetermined value, the automatic power factor adjustment device (4) first closes the make contact (4ta) in a predetermined order. Therefore, the control circuit unit QO closes the electromagnetic contactor (8a) to connect the capacitor (7a) to the circuit bus (1). Even if the capacitor (7a) is connected to the circuit bus (1), if the power factor of the circuit bus (1) is below a predetermined value, the automatic power factor adjustment device (4) next connects the make contact (41b). Close the capacitor (7b)
Connect to the circuit bus (1). The following make contact points (4)
1C)...(41r) is closed and the circuit bus (1)
Capacitor (7c)... until the power factor of
- Connect (7f) to the circuit bus (1) in sequence.

The conventional automatic power factor adjustment control device is configured as described above.
The control circuit section αQ is provided for one automatic power factor adjustment device (4), and controls capacitors (7a) to (
The number of circuits in 7f) is the make contacts (41a) to (41f) and break contacts (42
There was a restriction due to the number of output circuits of the control contacts a) to (42f) (the number of output circuits is 1 for the make contact (41a) and the break contact (42a)). For example, an automatic power factor adjustment device (
If the number of control contact circuits in 4) is six, the number of controllable capacitors (7a) to (7f) is essentially six. Therefore, if you want to control 12 circuits of capacitors, the automatic power factor adjustment device (4) and the control circuit section OQ
Two sets are required.

However, the two sets of automatic power factor adjustment device (4) and control circuit unit are the same instrument transformer (2) and instrument current transformer (3).
Because it is connected to the set value, it may fall over or the setting value may be severe.

Automatic power factor adjustment device (4) is better than other automatic power factor adjustment device (b).
! If you do not output a signal to turn on or cut off the capacitors (7a) (7f) before 1(4) and turn on or cut off all of the capacitors (7a) to (7f) that the device has, the other The device has a capacitor (7a) ~
(7f) There was a drawback that O-on or cut-off control could not be performed. Therefore, capacitors (7a) to (7f) of one device
) is turned on and off, however, the capacitors (7a) to (7f) of the other device are hardly controlled to turn on and off.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 2 and 8 are electrical wiring diagrams showing essential parts of an embodiment of the automatic power factor adjustment control device according to the present invention. In FIG. 2, 1. Second. 8th automatic power factor adjustment device (4X)
, (4Y), and (4Z) measure the reactive power by inputting the signals of the potential transformer (2) and potential current transformer (3) shown in Figure 1, respectively. When the input point of each is reached, each make contact (41Xa
)~(4xXf), (41Ya)~(41Yf
), (41Za) to (41ZF) are closed to output the capacitor closing signal, and when the preset capacitor cutoff point is reached, the break contact (a2xa) to (41Zf) is closed.
) (42xf), (42ya) ~ (42Yf), (
42Za) to (42Zf) are opened to output a capacitor cutoff signal.These signals are output in an order called cyclic control, and these signals are contact outputs and are output for a certain period of time. be. Relay coil (11Xa) ~ (11Xf), (11Ya) ~
(11Yf), (11Za) to (11Zf) and (12
Xa) to (12Xf).

(12Ya) ~ (12Yf), (12Za) ~ (12Z
f) are make contacts (41Xa) to (41Xf), respectively.
, (41Ya) ~ (41Yf), (41Za
)~(41Zf) and break contact (42Xa)~
(42Xf) - (42Ya) ~ (42Yf) + (
42Za ) (42Zf ), and make contacts (11Xal) to (11Xfl) and (11Xfl), respectively.
Yal) ~ (11Yfl), (11Zal) ~ (11Z
fl) and break contact (12Xal) ~ (12Xfl
).

(12Yal) ~ (12Yfl), (12Zal) ~ (
12Zfl).

The first stepping relay coil (to) constituting the first control circuit section (10a) has a make contact (11Xa 1
) to (ttZfl) are connected in series with respective parallel circuits,
Make contact (11Xal) - (ttzrl)
Each time the slider (181) is closed, the contact (18a
) (18f) one step at a time in the direction of the arrow. The second stepping relay coil Q4 constituting the second control circuit section (10b) has a break contact (1
The break contacts (12Xa 1 ) to (12Zf
Each time any one of l) is closed, the slider (141)
The contact points (14a) to (14f) are moved one step at a time in the direction of the arrow. 1st. 2nd ° 8th timer relay coil (G), 0Q, α old contact (18a)
.

The fourth. 6th. Sixth timer relay coil (g), On.

(E) is the common point of contacts (14a) and (14d), contact (
14b), (14c), contact point (14c), (1
It is connected between the common point of 4f) and the power supply (g). 1st
．． 21st 8th timer relay coil (to), Q[I,
(off-delay break contact (15b) of lη, (
t6b) and (t7b) respectively. Second. 8th automatic power factor adjustment device (4X), (4Y), (4Z) O input signal stop terminal (48X), (48Y), (48Z) and common terminal (44X).

(44Y) and (44Z), and the fourth. Fifth. 6th timer relay coil (g), a! I, (E) off-delay break contacts (18b), (19b), (
20b) are respectively 1st, 2nd, and 20b). The n-disconnection me stop terminal (4
5X), (45Y), (45Z) and common terminal (44X)
, (44Y), and (44Z). In FIG. 8, electromagnetic contacts (8Xa) to (8Zf) are connected to closing auxiliary coils (stx, a) connected in series to make contacts (11Xa2) to (ttzf2) of relay coils (11Xa) to (11Zf), respectively. - (81Zf), the closing coil (82Xa) ~ (82ZD) connected in series to the closing auxiliary coil (81Xa) (81Zf) (D 1 output contact (stxaD ~ (81Zfl)), and the relay coil (12Xa) ~ (12Zf) (7) Break contact (1
2Xa2) to (12Zf2) and two series-connected cutoff coils (88Xal to (ssZf)).

Next, the operation will be explained. Now, suppose that the reactive power of the circuit bus (1) shown in FIG. 1 increases, and the slider (181) of the first stepping relay coil 0 shown in FIG.
) is in the position of contact (18a), the first timer relay coil (to) is energized and its break contact (
15b) is open. Therefore, only the first automatic power factor adjustment device (4X) can be operated to close the capacitor, and the second automatic power factor adjustment device (4X) is capable of closing the capacitor.
The break contacts (t6b) and (ub) of the eighth automatic power factor adjustment devices (4Y) and (4Z) are closed, and the closing operation of the capacitor becomes impossible. In this state, when the reactive power reaches the set point of the first power factor automatic adjustment device (4x), the make contact (41Xa) is closed for a predetermined period of time to excite the relay coil (11Xa). Make contact (
11Xa2) closes and energizes the closing auxiliary coil (sxxxa), closes its make contact (stxal) and energizes the closing coil (82Xa), corresponding to the first automatic power factor adjustment device (4X). Connect the capacitor (7a) to the circuit motherboard 4I (
Connect to 1). On the other hand, when the relay coil (11Xa) is excited, the make contact (11Xal) shown in FIG. 2 closes and energizes the first stepping relay coil α4. Therefore, the slider (1st) advances and contacts (18b
), the first timer relay coil (to) is deenergized, and the second timer relay coil 0Q is energized. This causes the break contact (16b) to open and the second automatic power factor adjustment device is activated! (4Y) is the state in which the capacitor can be turned on. On the other hand, the break contact (15b) waits for the timer time to elapse and returns to the closed state, and the first automatic power factor adjustment device (4x) becomes incapable of closing the capacitor.

In this case, the off-delay timer time of the break contact (L5b) is set longer than the closing operation time of the electromagnetic contactor (8Xa).

Next, the reactive power of the circuit bus (1) continues to increase, and the second
When the power factor automatic adjustment device @ (4Y) reaches the closing point setting value, the make contact (41Ya) is closed for a predetermined period of time to energize the relay coil (11Ya), and in the same manner, the magnetic contactor (8Ya), and the second automatic power factor adjustment device (8Ya) is energized.
Connect the capacitor (7a) corresponding to 4Y) to the circuit bus (1)
Connect to. Further, the slider (181) of the first stepping relay coil (to) is closed to the contact (18c), and the eighth automatic power factor adjustment device I (4Z) is made ready for capacitor closing operation. 2 power factor automatic adjustment device (4
After a predetermined off-delay timer time has elapsed, Y) is brought into a state in which capacitor closing operation is disabled. Thereafter, the make contact (41Za) and (41Xbl-(41Zf)) are sequentially closed to perform the same operation.

Next, a case where reactive power decreases will be explained. First of all, if the slider (141) of No. 4 to the second stepping relay coil is in the position of the contact (14a), the fourth timer relay coil α barrel is energized and its break contact (18b) is Open. For this reason, the first automatic power factor adjustment device f! Only (4X) can be operated to cut off the capacitor, and the 2nd. 8th automatic power factor adjustment device'vll (4Y),
At (4Z), the break contacts (19b) and (20b) are closed, making it impossible to close the capacitor.

In this state, when the reactive power reaches the cutoff point setting value of the first automatic power factor adjustment device 1 (4X), the break contact (
42Xa) is opened for a predetermined time and the relay coil (12Xa) is opened for a predetermined time.
) is demagnetized. For this reason, the electromagnetic contactor (8
The break contact (12Xa 2 ) connected to Xa) closes and energizes the interrupting coil (88Xa ), and the capacitor (7a
) from the circuit busbar (1). On the other hand, the relay coil (
12Xa) is demagnetized, the break contact (12Xal) shown in FIG. 2 closes and energizes the second stepping relay coil α◆. Therefore, the slider (141) advances and closes with the contact (14b), and the fourth timer relay coil (g) is demagnetized and the sixth timer relay coil (0) is energized. This will cause the break contact (19b
) is opened and the second automatic power factor adjustment device (4Y) becomes ready for capacitor cutoff operation. On the other hand, the break contact (
tab) is restored to the open state after the timer time elapses, and the first automatic power factor adjustment device (4X) becomes unable to shut off the capacitor. In this case, the break contact (
The off-delay timer time of the magnetic contactor (
8Xa) is set longer than the cutoff operation time.

Next, the reactive power of the circuit bus (1) continues to decrease, and the second
When the cutoff point setting of the automatic power factor adjustment device (4Y) is reached, the break contact (42Ya) is opened for a predetermined time to demagnetize the relay coil (12Ya), and the electromagnetic contactor (8Ya) is attached in the same manner. and the second automatic power factor adjustment device (4
Separate the capacitor (7a) corresponding to Y) from the circuit bus (1). In addition, the slider (141) of the second stepping relay coil 04 is closed to the contact (14C), the eighth automatic power factor adjustment device (4Z) is enabled to interrupt the capacitor, and the second power After a predetermined off-delay timer time, the rate automatic adjustment device (4Y) is placed in a state in which capacitor closing operation is disabled. The following break contacts (42
Za), (42Xb) - (42Zf) are opened and the same operation is performed.

In addition, in FIG. 2, 1. Second. The input signal stop terminals (48X), (48Y), (48Z) of the eighth automatic power factor adjustment device (4X), (4Y), (4Z) and the common terminal (4
4X), (44Y).

(44Z) and cutoff signal stop terminal (45X), (4
5Y), (45Z) and common terminals (44X), (44Y)
, (44Z), corresponding electromagnetic contactors (8Xa), (8Xf), (8Y
a)-(8Yf), (8Za)...(8Zf
) by connecting the make and break contacts of the auxiliary contacts in series to form magnetic contactors (8Xa) - (8Xf), (8Y
a)...(8Yf), (82a)・<8Zf
) are all turned on or cut off, the turn-on signal or cut-off signal is applied to the first. Second. The eighth automatic power factor adjustment device (4X), (4Y), and (4Z) can be brought into a state in which they cannot output.

FIG. 4 is an electrical wiring diagram showing another embodiment of the electromagnetic contactor. In FIG. 4, the make contact (84a) and break contact (84b) are overcurrent and overvoltage, respectively.

These are residual make contacts and residual break contacts of relays that detect undervoltage, ground faults, case expansion, etc. That is, when an overcurrent or the like occurs, the make contact (84a) is closed and the break contact (84b) is opened to cut off the electromagnetic contactor (8Xa) and prevent it from being turned on again unless it is reset.

In addition, electromagnetic contactor (8Xa) = < 8Zf) tD
1st. Second control circuit section (10a), (lob)
Alternatively, a switch for switching between automatic and manual operating modes may be provided to allow manual operation. Also, for convenience of explanation, the first to eighth automatic power factor adjustment devices (4x) to
(4Z) outputs a capacitor closing signal or a shutoff signal, and after the timer expires, the closing signal stop terminal (48X),
(48Y).

(48Z) and common terminal (44X), (44Y),
(447,) or cutoff signal stop terminal (45X),
(45Y), (45Z) and common terminal (44X), (4
4Y) and (44Z), but unless a timer is set, as soon as the closing signal or shutoff signal is output, the terminals will be closed and the capacitor will close or shut off. This is because there is a possibility that the operation may be hindered. However, with the automatic power factor adjustment devices that are currently manufactured and sold, once a turn-on signal or a cut-off signal is output, even if the terminals are closed during the output period, the output signal remains within a predetermined time width. Therefore, the first to sixth timer relay coils 0Q-(a) do not necessarily have a timer function, and can be replaced with ordinary relay coils.

Furthermore, the first. Second stepping relay coil (13
, Q4; The sliders (181) and (141) of 1 are 6-contact automatic power factor adjustment devices. (4X)～(
4Y), but it goes without saying that six automatic power factor adjustment devices can be connected to each other (as many automatic power factor adjustment devices as there are contacts of the stepping relay).

As described above, according to the present invention, it is possible to control the operation frequency of the maximum number of controllable capacitor circuits in a plurality of automatic power factor adjustment devices to be equal, thereby extending the life of the device and improving reliability. has.

[Brief explanation of drawings]

FIG. 1 is an electrical wiring diagram showing a conventional power factor automatic adjustment control device, and FIGS. 2 and 8 are power-electrical wiring diagrams according to the present invention. In the figures, the same parts or equivalent parts in each figure are denoted by the same reference numerals or suffixes.
1) is the busbar circuit, (2) is the instrument transformer, (3) is the instrument current transformer, (4x) to (4Z) are the first to eighth automatic power factor regulators, and (41Xa) to ( 41Zf) is a make contact,
(42Xa) to (42Zf) are break contacts, (4
8X) ~ (48Z) are input signal stop terminals, (44X) ~
(44Z) is a common terminal, (45X) to (45Z) are cutoff signal stop terminals, (5a) to (5c) are loads, (7a) to
(7f) is a capacitor, (8Xa) to (8Zf)
is an electromagnetic contactor, (84a) is a make contact, (84b) is a break contact, (10a) and (10b) are the first.
second control circuit section, (1tXa) to (11Zf),
(12Xa)-(12Zf) is the relay coil, (1
1Xal) ~ (11Zfl), (11Xa2) ~ (11
Zf2) is the make contact, (12X a 1 )””(1
2Z f 1 ) + (12Xa 2 ) ~ (12Z
f 2 ) is the break contact, 0. Q4 is the first. The second stepping relay coils (181) and (141) are sliders (18a) to (18f). (14a) to (14f) are contacts, (to) to (e) are first to sixth timer relay coils, (15b) to (20b)
) is a break contact. Agent Patent Attorney Makoto Kazuno

Claims (2)

[Claims] (1) A plurality of automatic power factor adjusting devices each outputting a capacitor closing signal and a capacitor closing signal as independent pulsed contact signals, each of the plurality of power factor automatic adjusting devices stepping when outputting the capacitor closing signal. first driven
a stepping relay, and a second stepping relay that is driven step by step when each of the plurality of automatic power factor adjustment devices outputs a capacitor cutoff signal; An automatic power factor adjustment control device, characterized in that the plurality of automatic power factor adjustment devices are sequentially energized depending on the stepping state of the second stepping relay. (2) The plurality of automatic power factor adjustment devices each have a closing signal stop terminal that stops outputting a capacitor closing signal when connected to a common terminal, and a closing signal stop terminal that stops outputting a capacitor closing signal when connected to the common terminal. A first cut-off signal stop terminal is provided. The connection state between the on-signal stop terminal and the common terminal and the connection state between the cut-off signal stop terminal and the common terminal are controlled by contacts of a plurality of relays that are energized depending on the sidewalk state of the second stepping relay. An automatic power factor adjustment control device according to claim (1).