Shanghai Huabang Industrial Business Network - Intermediate converter

[Intermediate converter]LQR-D type intermediate converter

2026-6-15 20:56:33

The LQR-D type intermediate converter is a double winding structure, suitable for bus differential protection and transformer differential protection in power systems. It can effectively compensate for unbalanced currents caused by different current ratios of current transformers, thereby ensuring the normal operation of the protection device. The LQR-D type intermediate converter belongs to a decentralized configuration structure (i.e. a group of current transformers are separately configured with a group of intermediate converters according to the required current ratio).

Technical parameters of LQR-D type intermediate converter

current ratio	2/1	2.5/1	3/1	4/1	5/1	6/1
Rated primary current (A)	ten	twelve point five	fifteen	twenty	twenty-five	thirty
Rated secondary current (A)	five	five	five	five	five	five
Maximum operating voltage (V)	four hundred and fifteen
Rated frequency (Hz)	fifty
insulation level	Power frequency 3kV, 1min
accuracy level	zero point two
Rated secondary load (��)	1.2(cos��=0.8)
Accurate limit coefficient	forty-two	forty-two	thirty-nine	forty-one	thirty-five	thirty
Converted to the primary side Short circuit impedance (��)	zero point seven one eight	zero point five one	zero point three two one	zero point two two four	zero point one seven two	zero point one four five
Weight (kg)	twelve point six	twelve point two	fifteen point five	sixteen	sixteen	eleven point three

Note: The intermediate inverter can be designed with various types of transformation ratios and different electrical performance according to different user needs.

[Intermediate converter]LZM-4D type intermediate converter

2026-6-15 20:56:25

The LZM-4D intermediate converter is an autotransformer winding structure, suitable for bus differential protection and transformer differential protection in power systems. It can effectively compensate for unbalanced currents caused by different current ratios of current transformers, thereby ensuring the normal operation of the protection device.

The LZM-4D type intermediate converter belongs to a centralized configuration structure (i.e., four or fewer current transformers with the same or different transformation ratios only need to be configured with one set of intermediate converters. This type of product has eight commonly used current ratio taps, which has strong universality and is easy to adjust the corresponding current ratio in conjunction with changes in system operation mode)

Technical parameters of LZM-4D intermediate converter (for centralized configuration)

current ratio	1.25/1	1.5/1	2/1	2.5/1	3/1	3.75/1	4/1	5/1
Rated primary current (A)	twenty	twenty	twenty	twenty	twenty	twenty	twenty	twenty
Rated secondary current (A)	sixteen	thirteen point three three	ten	eight	six point six seven	five point three three	five	four
Maximum operating voltage (V)	four hundred and fifteen
Rated frequency (Hz)	fifty
insulation level	Power frequency 3kV, 1min
accuracy level	5P
Rated secondary load (��)	1.2(cos��=0.8)
Accurate limit coefficient	thirty-one	thirty-seven	forty-nine	sixty-two	seventy-four	ninety-three	ninety-nine	>100
Converted to the short-circuit impedance on the primary side (��)	zero point zero four two	zero point zero five five	zero point zero six	zero point zero five six seven	zero point zero five one two	zero point zero four five	zero point zero four	zero point zero three
Rated consumption (VA)	sixteen point eight	twenty-two	twenty-four	twenty-two point seven	twenty point five	eighteen	sixteen	twelve
Weight (kg)	seventeen

[Intermediate converter]LZM-1D type intermediate converter

2026-6-15 20:56:16

Overview
The LZM-1D intermediate converter is an autotransformer winding structure, suitable for bus differential protection and transformer differential protection in power systems. It can effectively compensate for unbalanced currents caused by different current ratios of current transformers, thereby ensuring the normal operation of the protection device.

The LZM-1D type intermediate converter belongs to a decentralized configuration structure (i.e. a group of current transformers are separately configured with a group of intermediate converters according to the required current ratio).

Technical parameters of LZM-1D type step-down series intermediate converter (for decentralized configuration)

current ratio

one point two
/1

one point two five
/1

one point five
/1

two
/1

two point zero eight
/1

two point three
/1

two point three eight six
/1

two point five
/1

two point six six
/1

three
/1

three point three three
/1

three point seven five
/1

four
/1

five
/1

five point three three
/1

six
/1

eight
/1

Rated primary current
(A)

five

Rated secondary current
(A)

four point one six six

four

three point three three

two point five

two point four

two point one seven five

two point zero nine six

two

one point eight seven five

one point six six seven

one point five

one point three three

one point two five

one

zero point nine three eight

zero point eight three three

zero point six two five

Maximum operating voltage
(V)

four hundred and fifteen

Rated frequency (Hz)

fifty

insulation level

Power frequency 3kV, 1min

accuracy level

Rated secondary load
(��)

1.2(cos��=0.8)

Accurate limit coefficient

twenty-eight

twenty-nine

thirty-five

forty-one

forty-seven

fifty

fifty-two

forty-two

forty-seven

fifty-one

fifty-eight

sixty-three

seventy-six

eighty-four

ninety-five

>100

Converted to the primary side
Short circuit impedance (��)

.064

.072

.093

.04

.037

.034

.033

.031

.092

.085

.0824

.08

.077

.064

.058

.055

.040

Rated consumption (VA)

one point six

one point eight

two point three two five

one

zero point nine five

zero point eight five

zero point eight two five

zero point seven seven five

two point three

two point one two five

two point zero six

two

one point nine two five

one point six

one point four five

one point three seven five

one

Weight (kg)

nine point six

eight point five

eight

Technical parameters of LZM-1D series boost converter (for decentralized configuration)

current ratio	1/1.25	1/1.33	1/1.5	1/1.67	1/2
Rated primary current (A)	five	five	five	five	five
Rated secondary current (A)	six point two five	six point six seven	seven point five	eight point three three	ten
Maximum operating voltage (V)	four hundred and fifteen
Rated frequency (Hz)	fifty
insulation level	Power frequency 3kV, 1min
accuracy level	5P
Rated secondary load (��)	1.2(cos��=0.8)
Accurate limit coefficient	twenty-one	nineteen	fifteen	thirteen	nine
Converted to the short-circuit impedance on the primary side (��)	zero point one one six	zero point one one four	zero point one eight six	zero point two five two	zero point three six six
Rated consumption (VA)	two point nine	three point six	four point six five	six point three	nine point one five
Weight (kg)	twelve