DY-30/Z type voltage relayDetailed product description：

1 Overview

1.1 Purpose
The DY-30/Z (DY-35/Z, DY-36/Z, DY-37/Z, DY-38/Z) voltage relay (hereinafter referred to as the product) is mainly used in power system relay protection lines as an action component for low-voltage interlocking.

1.2 Specifications and Setting Range are shown in Table 1 below

Product model

rated voltage (Parallel)

Setting value point 1

Setting value point 2

Setting value point 3

Setting value point 4

Setting value point 5

Setting range

parallel connection

series connection

parallel connection

series connection

parallel connection

series connection

parallel connection

series connection

parallel connection

series connection

parallel connection

series connection

DY-35／Z

thirty one hundred two hundred

twelve

twenty-four

fifteen

thirty

eighteen

thirty-six

twenty-one

forty-two

twenty-four

forty-eight

12~24

24~48

DY-36／Z

forty

eighty

fifty

one hundred

sixty

one hundred and twenty

seventy

eighty

eighty

one hundred and sixty

40~80

80~160

DY-37／Z

eighty

one hundred and sixty

one hundred

two hundred

one hundred and twenty

two hundred and forty

one hundred and forty

one hundred and sixty

one hundred and sixty

three hundred and twenty

80~160

160～32C

DY-38／Z

Structure and Characteristics of DY-30/Z Voltage Relay
This product has a plug-in structure, embedded installation, and a transparent plastic cover, which allows easy observation of the voltage setting value and specifications of the product. The installation method is also a protruding installation, and the structural forms are A11K, A11H, A1lQ. The external dimensions and installation dimensions of the product are shown inAppendix II.
The plug-in structure is easy to adjust and maintain. When the product leaves the factory, the factory provides a complete set of parts for installation and wiring, as well as spare parts supplied according to the contract.

3 Principles of Action
This product adopts the rectification principle, and the magnetic system has two coils. The coil heads are connected to the output terminals of the rectifier bridge, and the two input terminals of the rectifier bridge are connected to the base terminals ②, ⑥, ④, and ⑧. Users can connect them in series or parallel as needed, thus doubling the setting range of the product.
The scale and rated values on the product nameplate are obtained when the coils are connected in parallel. By rotating the pointer on the dial, the mechanical reaction torque of the balance spring can be changed, thereby altering the operating value of the product.
The internal wiring diagram of the product is shown in Figure 1, and the terminal wiring diagram is shown in Figure 2.



Figure 1 Internal wiring diagram

DY-35/Z

DY-36/Z

DY-37/Z

DY-38/Z

Figure 2 Terminal Wiring Diagram

4 Electrical and working principles of the product
4.1 Electrical Principles
Electrical schematic diagram and internal wiring diagram
Among them: C1 C3- used as a voltage reducing component
C2 C4- Used as a filter
D1 D2- Improve return coefficient
4.2 Working principle
After rectification and filtering, the AC voltage is applied to both ends of the coil of the electromagnetic voltage relay. The electromagnetic torque generated by the coil is compared with the reaction torque of the balance spring and acts accordingly. Due to the rectification and filtering of the AC voltage, the zero crossing of the voltage is avoided, resulting in the electromagnetic torque generated due to the shaking phenomenon caused by the zero crossing of the voltage, which improves the reliability of the voltage relay operation.

Main specifications of DY-30/Z voltage relay

5.1 The return coefficient of the product shall not exceed 1.25.
5.2 The consistency of product operating voltage shall not exceed 5%.
5.3 The action time of the product shall not exceed 0.15s, that is, the action time when the working voltage is 0.5 times the set voltage shall not exceed 0.15s.
The setting value error of the product shall not exceed ± 5%.

Wiring, debugging, and required instruments for 6 products
6.1 Required instruments: one AC voltmeter (0.5 level) and one AC voltage regulator.
6.2 Wiring and Debugging
a) The wiring diagram is shown in Figure 3
b) Debugging: Start from the minimum setting value, that is, first point the pointer to the minimum setting value, check that the wiring is correct, and adjust the voltage regulator to zero, connect the power supply, adjust the voltage regulator to gradually increase its voltage above the setting value, then slowly reduce the voltage to observe its action, record the action value, and then increase the voltage to record the return voltage, so as to calculate the return coefficient. Then point the pointer to the set values of the second, third, fourth, and fifth o'clock. Debugging as above.



Figure 3 Test wiring diagram

Working conditions of 7 products
7.1 The ambient temperature is -25 to 40 ℃;
7.2 Atmospheric pressure: 80-10kPa;
7.3 Relative temperature; The monthly average maximum relative humidity of the wettest month is 90%, and the monthly average minimum temperature of that month is 25 ℃, with no visible dew on the surface. When the maximum temperature is 40 ℃, the average maximum relative humidity does not exceed 50%.
The vibration response and impact response at the usage location shall not exceed the severity level I specified in Article 5.10.4 and 5.10.5 of ZBK45020-90 "General Technical Conditions for Automatic Relays and Devices for Power System Protection".
7.5 The usage location should have protective facilities against wind, snow, rain, and sand, and should be free of corrosive and explosive gases.

8 Use and maintenance
Before using the relay, the outer shell needs to be removed and checked for any damage that may have occurred during transportation, such as the moving plate touching the magnetic plate, the spring coils touching each other, friction on the moving plate shaft, etc. To do so, set the pointer of the relay to the first setting point, move the movable system towards the magnetic plate by hand, and then release it. The movable system should return to its original equilibrium position until the stop, and then make necessary adjustments and settings.
When readjusting the relay, it must be ensured that:
The axial movement of the movable system is between 0.15 and 0.3mm.
8.2 The air gap between the moving piece and the magnetic pole should ensure that the relay does not collide with the moving piece and the magnetic pole under any specified conditions.
During the operation of a relay with dynamic contact and dynamic break contact, the bridge shaped contact shall not simultaneously contact the dynamic contact and dynamic break contact.
When the pointer rotates from the first scale value to the final scale value, the coils of the balance spring must not touch each other.
When the relay is activated, the bridge shaped contact should slide on the centerline of the static contact with a tolerance of ± 1mm, and the total air gap between the dynamic and static contacts should not be less than 2mm.
The distance between the static contact point and the limiting plate shall not exceed 0.3mm.
8.7 It is not advisable to lubricate the shaft and bearings of the relay.
8.8 It is not allowed to clean the contacts with sandpaper or other rough materials. It is recommended to use a sharp blade or a clean fine grinding stone to clean the contacts, and then wipe them clean with a soft cloth to avoid touching the contacts with fingers.

9. Complete set of supply
Together with each relay. The factory should provide complete sets of:
9.1 One copy of the certificate of conformity;
9.2 One user manual (one for the same batch of orders from the same user)
9.3 Spare parts that should be provided as stipulated in the contract;
9.4 Complete set of components for installing wiring.

10 Ordering Instructions
Please specify when placing an order
10.1 Product model and name;
10.2 Order quantity.
10.3 Maximum setting value.

DY-30/Z type voltage relay（No image available）